diff options
Diffstat (limited to 'modules/brotli/enc')
60 files changed, 21088 insertions, 0 deletions
diff --git a/modules/brotli/enc/backward_references.c b/modules/brotli/enc/backward_references.c new file mode 100644 index 000000000..cd023d9b4 --- /dev/null +++ b/modules/brotli/enc/backward_references.c @@ -0,0 +1,144 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function to find backward reference copies. */ + +#include "./backward_references.h" + +#include "../common/constants.h" +#include "../common/dictionary.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./command.h" +#include "./dictionary_hash.h" +#include "./memory.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static BROTLI_INLINE size_t ComputeDistanceCode(size_t distance, + size_t max_distance, + const int* dist_cache) { + if (distance <= max_distance) { + size_t distance_plus_3 = distance + 3; + size_t offset0 = distance_plus_3 - (size_t)dist_cache[0]; + size_t offset1 = distance_plus_3 - (size_t)dist_cache[1]; + if (distance == (size_t)dist_cache[0]) { + return 0; + } else if (distance == (size_t)dist_cache[1]) { + return 1; + } else if (offset0 < 7) { + return (0x9750468 >> (4 * offset0)) & 0xF; + } else if (offset1 < 7) { + return (0xFDB1ACE >> (4 * offset1)) & 0xF; + } else if (distance == (size_t)dist_cache[2]) { + return 2; + } else if (distance == (size_t)dist_cache[3]) { + return 3; + } + } + return distance + BROTLI_NUM_DISTANCE_SHORT_CODES - 1; +} + +#define EXPAND_CAT(a, b) CAT(a, b) +#define CAT(a, b) a ## b +#define FN(X) EXPAND_CAT(X, HASHER()) +#define EXPORT_FN(X) EXPAND_CAT(X, EXPAND_CAT(PREFIX(), HASHER())) + +#define PREFIX() N + +#define HASHER() H2 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H3 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H4 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H5 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H6 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H40 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H41 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H42 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H54 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H35 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H55 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#define HASHER() H65 +/* NOLINTNEXTLINE(build/include) */ +#include "./backward_references_inc.h" +#undef HASHER + +#undef PREFIX + +#undef EXPORT_FN +#undef FN +#undef CAT +#undef EXPAND_CAT + +void BrotliCreateBackwardReferences( + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ringbuffer_mask, const BrotliEncoderParams* params, + HasherHandle hasher, int* dist_cache, size_t* last_insert_len, + Command* commands, size_t* num_commands, size_t* num_literals) { + switch (params->hasher.type) { +#define CASE_(N) \ + case N: \ + CreateBackwardReferencesNH ## N( \ + num_bytes, position, ringbuffer, \ + ringbuffer_mask, params, hasher, dist_cache, \ + last_insert_len, commands, num_commands, num_literals); \ + return; + FOR_GENERIC_HASHERS(CASE_) +#undef CASE_ + default: + break; + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/backward_references.h b/modules/brotli/enc/backward_references.h new file mode 100644 index 000000000..3a4146647 --- /dev/null +++ b/modules/brotli/enc/backward_references.h @@ -0,0 +1,38 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function to find backward reference copies. */ + +#ifndef BROTLI_ENC_BACKWARD_REFERENCES_H_ +#define BROTLI_ENC_BACKWARD_REFERENCES_H_ + +#include "../common/constants.h" +#include "../common/dictionary.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./command.h" +#include "./hash.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* "commands" points to the next output command to write to, "*num_commands" is + initially the total amount of commands output by previous + CreateBackwardReferences calls, and must be incremented by the amount written + by this call. */ +BROTLI_INTERNAL void BrotliCreateBackwardReferences( + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ringbuffer_mask, const BrotliEncoderParams* params, + HasherHandle hasher, int* dist_cache, size_t* last_insert_len, + Command* commands, size_t* num_commands, size_t* num_literals); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_BACKWARD_REFERENCES_H_ */ diff --git a/modules/brotli/enc/backward_references_hq.c b/modules/brotli/enc/backward_references_hq.c new file mode 100644 index 000000000..96b0e708d --- /dev/null +++ b/modules/brotli/enc/backward_references_hq.c @@ -0,0 +1,825 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function to find backward reference copies. */ + +#include "./backward_references_hq.h" + +#include <string.h> /* memcpy, memset */ + +#include "../common/constants.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./command.h" +#include "./fast_log.h" +#include "./find_match_length.h" +#include "./literal_cost.h" +#include "./memory.h" +#include "./params.h" +#include "./prefix.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define BROTLI_MAX_EFFECTIVE_DISTANCE_ALPHABET_SIZE 544 + +static const float kInfinity = 1.7e38f; /* ~= 2 ^ 127 */ + +static const uint32_t kDistanceCacheIndex[] = { + 0, 1, 2, 3, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, +}; +static const int kDistanceCacheOffset[] = { + 0, 0, 0, 0, -1, 1, -2, 2, -3, 3, -1, 1, -2, 2, -3, 3 +}; + +void BrotliInitZopfliNodes(ZopfliNode* array, size_t length) { + ZopfliNode stub; + size_t i; + stub.length = 1; + stub.distance = 0; + stub.dcode_insert_length = 0; + stub.u.cost = kInfinity; + for (i = 0; i < length; ++i) array[i] = stub; +} + +static BROTLI_INLINE uint32_t ZopfliNodeCopyLength(const ZopfliNode* self) { + return self->length & 0x1FFFFFF; +} + +static BROTLI_INLINE uint32_t ZopfliNodeLengthCode(const ZopfliNode* self) { + const uint32_t modifier = self->length >> 25; + return ZopfliNodeCopyLength(self) + 9u - modifier; +} + +static BROTLI_INLINE uint32_t ZopfliNodeCopyDistance(const ZopfliNode* self) { + return self->distance; +} + +static BROTLI_INLINE uint32_t ZopfliNodeDistanceCode(const ZopfliNode* self) { + const uint32_t short_code = self->dcode_insert_length >> 27; + return short_code == 0 ? + ZopfliNodeCopyDistance(self) + BROTLI_NUM_DISTANCE_SHORT_CODES - 1 : + short_code - 1; +} + +static BROTLI_INLINE uint32_t ZopfliNodeCommandLength(const ZopfliNode* self) { + return ZopfliNodeCopyLength(self) + (self->dcode_insert_length & 0x7FFFFFF); +} + +/* Histogram based cost model for zopflification. */ +typedef struct ZopfliCostModel { + /* The insert and copy length symbols. */ + float cost_cmd_[BROTLI_NUM_COMMAND_SYMBOLS]; + float* cost_dist_; + uint32_t distance_histogram_size; + /* Cumulative costs of literals per position in the stream. */ + float* literal_costs_; + float min_cost_cmd_; + size_t num_bytes_; +} ZopfliCostModel; + +static void InitZopfliCostModel( + MemoryManager* m, ZopfliCostModel* self, const BrotliDistanceParams* dist, + size_t num_bytes) { + uint32_t distance_histogram_size = dist->alphabet_size; + if (distance_histogram_size > BROTLI_MAX_EFFECTIVE_DISTANCE_ALPHABET_SIZE) { + distance_histogram_size = BROTLI_MAX_EFFECTIVE_DISTANCE_ALPHABET_SIZE; + } + self->num_bytes_ = num_bytes; + self->literal_costs_ = BROTLI_ALLOC(m, float, num_bytes + 2); + self->cost_dist_ = BROTLI_ALLOC(m, float, dist->alphabet_size); + self->distance_histogram_size = distance_histogram_size; + if (BROTLI_IS_OOM(m)) return; +} + +static void CleanupZopfliCostModel(MemoryManager* m, ZopfliCostModel* self) { + BROTLI_FREE(m, self->literal_costs_); + BROTLI_FREE(m, self->cost_dist_); +} + +static void SetCost(const uint32_t* histogram, size_t histogram_size, + BROTLI_BOOL literal_histogram, float* cost) { + size_t sum = 0; + size_t missing_symbol_sum; + float log2sum; + float missing_symbol_cost; + size_t i; + for (i = 0; i < histogram_size; i++) { + sum += histogram[i]; + } + log2sum = (float)FastLog2(sum); + missing_symbol_sum = sum; + if (!literal_histogram) { + for (i = 0; i < histogram_size; i++) { + if (histogram[i] == 0) missing_symbol_sum++; + } + } + missing_symbol_cost = (float)FastLog2(missing_symbol_sum) + 2; + for (i = 0; i < histogram_size; i++) { + if (histogram[i] == 0) { + cost[i] = missing_symbol_cost; + continue; + } + + /* Shannon bits for this symbol. */ + cost[i] = log2sum - (float)FastLog2(histogram[i]); + + /* Cannot be coded with less than 1 bit */ + if (cost[i] < 1) cost[i] = 1; + } +} + +static void ZopfliCostModelSetFromCommands(ZopfliCostModel* self, + size_t position, + const uint8_t* ringbuffer, + size_t ringbuffer_mask, + const Command* commands, + size_t num_commands, + size_t last_insert_len) { + uint32_t histogram_literal[BROTLI_NUM_LITERAL_SYMBOLS]; + uint32_t histogram_cmd[BROTLI_NUM_COMMAND_SYMBOLS]; + uint32_t histogram_dist[BROTLI_MAX_EFFECTIVE_DISTANCE_ALPHABET_SIZE]; + float cost_literal[BROTLI_NUM_LITERAL_SYMBOLS]; + size_t pos = position - last_insert_len; + float min_cost_cmd = kInfinity; + size_t i; + float* cost_cmd = self->cost_cmd_; + + memset(histogram_literal, 0, sizeof(histogram_literal)); + memset(histogram_cmd, 0, sizeof(histogram_cmd)); + memset(histogram_dist, 0, sizeof(histogram_dist)); + + for (i = 0; i < num_commands; i++) { + size_t inslength = commands[i].insert_len_; + size_t copylength = CommandCopyLen(&commands[i]); + size_t distcode = commands[i].dist_prefix_ & 0x3FF; + size_t cmdcode = commands[i].cmd_prefix_; + size_t j; + + histogram_cmd[cmdcode]++; + if (cmdcode >= 128) histogram_dist[distcode]++; + + for (j = 0; j < inslength; j++) { + histogram_literal[ringbuffer[(pos + j) & ringbuffer_mask]]++; + } + + pos += inslength + copylength; + } + + SetCost(histogram_literal, BROTLI_NUM_LITERAL_SYMBOLS, BROTLI_TRUE, + cost_literal); + SetCost(histogram_cmd, BROTLI_NUM_COMMAND_SYMBOLS, BROTLI_FALSE, + cost_cmd); + SetCost(histogram_dist, self->distance_histogram_size, BROTLI_FALSE, + self->cost_dist_); + + for (i = 0; i < BROTLI_NUM_COMMAND_SYMBOLS; ++i) { + min_cost_cmd = BROTLI_MIN(float, min_cost_cmd, cost_cmd[i]); + } + self->min_cost_cmd_ = min_cost_cmd; + + { + float* literal_costs = self->literal_costs_; + float literal_carry = 0.0; + size_t num_bytes = self->num_bytes_; + literal_costs[0] = 0.0; + for (i = 0; i < num_bytes; ++i) { + literal_carry += + cost_literal[ringbuffer[(position + i) & ringbuffer_mask]]; + literal_costs[i + 1] = literal_costs[i] + literal_carry; + literal_carry -= literal_costs[i + 1] - literal_costs[i]; + } + } +} + +static void ZopfliCostModelSetFromLiteralCosts(ZopfliCostModel* self, + size_t position, + const uint8_t* ringbuffer, + size_t ringbuffer_mask) { + float* literal_costs = self->literal_costs_; + float literal_carry = 0.0; + float* cost_dist = self->cost_dist_; + float* cost_cmd = self->cost_cmd_; + size_t num_bytes = self->num_bytes_; + size_t i; + BrotliEstimateBitCostsForLiterals(position, num_bytes, ringbuffer_mask, + ringbuffer, &literal_costs[1]); + literal_costs[0] = 0.0; + for (i = 0; i < num_bytes; ++i) { + literal_carry += literal_costs[i + 1]; + literal_costs[i + 1] = literal_costs[i] + literal_carry; + literal_carry -= literal_costs[i + 1] - literal_costs[i]; + } + for (i = 0; i < BROTLI_NUM_COMMAND_SYMBOLS; ++i) { + cost_cmd[i] = (float)FastLog2(11 + (uint32_t)i); + } + for (i = 0; i < self->distance_histogram_size; ++i) { + cost_dist[i] = (float)FastLog2(20 + (uint32_t)i); + } + self->min_cost_cmd_ = (float)FastLog2(11); +} + +static BROTLI_INLINE float ZopfliCostModelGetCommandCost( + const ZopfliCostModel* self, uint16_t cmdcode) { + return self->cost_cmd_[cmdcode]; +} + +static BROTLI_INLINE float ZopfliCostModelGetDistanceCost( + const ZopfliCostModel* self, size_t distcode) { + return self->cost_dist_[distcode]; +} + +static BROTLI_INLINE float ZopfliCostModelGetLiteralCosts( + const ZopfliCostModel* self, size_t from, size_t to) { + return self->literal_costs_[to] - self->literal_costs_[from]; +} + +static BROTLI_INLINE float ZopfliCostModelGetMinCostCmd( + const ZopfliCostModel* self) { + return self->min_cost_cmd_; +} + +/* REQUIRES: len >= 2, start_pos <= pos */ +/* REQUIRES: cost < kInfinity, nodes[start_pos].cost < kInfinity */ +/* Maintains the "ZopfliNode array invariant". */ +static BROTLI_INLINE void UpdateZopfliNode(ZopfliNode* nodes, size_t pos, + size_t start_pos, size_t len, size_t len_code, size_t dist, + size_t short_code, float cost) { + ZopfliNode* next = &nodes[pos + len]; + next->length = (uint32_t)(len | ((len + 9u - len_code) << 25)); + next->distance = (uint32_t)dist; + next->dcode_insert_length = (uint32_t)( + (short_code << 27) | (pos - start_pos)); + next->u.cost = cost; +} + +typedef struct PosData { + size_t pos; + int distance_cache[4]; + float costdiff; + float cost; +} PosData; + +/* Maintains the smallest 8 cost difference together with their positions */ +typedef struct StartPosQueue { + PosData q_[8]; + size_t idx_; +} StartPosQueue; + +static BROTLI_INLINE void InitStartPosQueue(StartPosQueue* self) { + self->idx_ = 0; +} + +static size_t StartPosQueueSize(const StartPosQueue* self) { + return BROTLI_MIN(size_t, self->idx_, 8); +} + +static void StartPosQueuePush(StartPosQueue* self, const PosData* posdata) { + size_t offset = ~(self->idx_++) & 7; + size_t len = StartPosQueueSize(self); + size_t i; + PosData* q = self->q_; + q[offset] = *posdata; + /* Restore the sorted order. In the list of |len| items at most |len - 1| + adjacent element comparisons / swaps are required. */ + for (i = 1; i < len; ++i) { + if (q[offset & 7].costdiff > q[(offset + 1) & 7].costdiff) { + BROTLI_SWAP(PosData, q, offset & 7, (offset + 1) & 7); + } + ++offset; + } +} + +static const PosData* StartPosQueueAt(const StartPosQueue* self, size_t k) { + return &self->q_[(k - self->idx_) & 7]; +} + +/* Returns the minimum possible copy length that can improve the cost of any */ +/* future position. */ +static size_t ComputeMinimumCopyLength(const float start_cost, + const ZopfliNode* nodes, + const size_t num_bytes, + const size_t pos) { + /* Compute the minimum possible cost of reaching any future position. */ + float min_cost = start_cost; + size_t len = 2; + size_t next_len_bucket = 4; + size_t next_len_offset = 10; + while (pos + len <= num_bytes && nodes[pos + len].u.cost <= min_cost) { + /* We already reached (pos + len) with no more cost than the minimum + possible cost of reaching anything from this pos, so there is no point in + looking for lengths <= len. */ + ++len; + if (len == next_len_offset) { + /* We reached the next copy length code bucket, so we add one more + extra bit to the minimum cost. */ + min_cost += 1.0f; + next_len_offset += next_len_bucket; + next_len_bucket *= 2; + } + } + return len; +} + +/* REQUIRES: nodes[pos].cost < kInfinity + REQUIRES: nodes[0..pos] satisfies that "ZopfliNode array invariant". */ +static uint32_t ComputeDistanceShortcut(const size_t block_start, + const size_t pos, + const size_t max_backward_limit, + const size_t gap, + const ZopfliNode* nodes) { + const size_t clen = ZopfliNodeCopyLength(&nodes[pos]); + const size_t ilen = nodes[pos].dcode_insert_length & 0x7FFFFFF; + const size_t dist = ZopfliNodeCopyDistance(&nodes[pos]); + /* Since |block_start + pos| is the end position of the command, the copy part + starts from |block_start + pos - clen|. Distances that are greater than + this or greater than |max_backward_limit| + |gap| are static dictionary + references, and do not update the last distances. + Also distance code 0 (last distance) does not update the last distances. */ + if (pos == 0) { + return 0; + } else if (dist + clen <= block_start + pos + gap && + dist <= max_backward_limit + gap && + ZopfliNodeDistanceCode(&nodes[pos]) > 0) { + return (uint32_t)pos; + } else { + return nodes[pos - clen - ilen].u.shortcut; + } +} + +/* Fills in dist_cache[0..3] with the last four distances (as defined by + Section 4. of the Spec) that would be used at (block_start + pos) if we + used the shortest path of commands from block_start, computed from + nodes[0..pos]. The last four distances at block_start are in + starting_dist_cache[0..3]. + REQUIRES: nodes[pos].cost < kInfinity + REQUIRES: nodes[0..pos] satisfies that "ZopfliNode array invariant". */ +static void ComputeDistanceCache(const size_t pos, + const int* starting_dist_cache, + const ZopfliNode* nodes, + int* dist_cache) { + int idx = 0; + size_t p = nodes[pos].u.shortcut; + while (idx < 4 && p > 0) { + const size_t ilen = nodes[p].dcode_insert_length & 0x7FFFFFF; + const size_t clen = ZopfliNodeCopyLength(&nodes[p]); + const size_t dist = ZopfliNodeCopyDistance(&nodes[p]); + dist_cache[idx++] = (int)dist; + /* Because of prerequisite, p >= clen + ilen >= 2. */ + p = nodes[p - clen - ilen].u.shortcut; + } + for (; idx < 4; ++idx) { + dist_cache[idx] = *starting_dist_cache++; + } +} + +/* Maintains "ZopfliNode array invariant" and pushes node to the queue, if it + is eligible. */ +static void EvaluateNode( + const size_t block_start, const size_t pos, const size_t max_backward_limit, + const size_t gap, const int* starting_dist_cache, + const ZopfliCostModel* model, StartPosQueue* queue, ZopfliNode* nodes) { + /* Save cost, because ComputeDistanceCache invalidates it. */ + float node_cost = nodes[pos].u.cost; + nodes[pos].u.shortcut = ComputeDistanceShortcut( + block_start, pos, max_backward_limit, gap, nodes); + if (node_cost <= ZopfliCostModelGetLiteralCosts(model, 0, pos)) { + PosData posdata; + posdata.pos = pos; + posdata.cost = node_cost; + posdata.costdiff = node_cost - + ZopfliCostModelGetLiteralCosts(model, 0, pos); + ComputeDistanceCache( + pos, starting_dist_cache, nodes, posdata.distance_cache); + StartPosQueuePush(queue, &posdata); + } +} + +/* Returns longest copy length. */ +static size_t UpdateNodes( + const size_t num_bytes, const size_t block_start, const size_t pos, + const uint8_t* ringbuffer, const size_t ringbuffer_mask, + const BrotliEncoderParams* params, const size_t max_backward_limit, + const int* starting_dist_cache, const size_t num_matches, + const BackwardMatch* matches, const ZopfliCostModel* model, + StartPosQueue* queue, ZopfliNode* nodes) { + const size_t cur_ix = block_start + pos; + const size_t cur_ix_masked = cur_ix & ringbuffer_mask; + const size_t max_distance = BROTLI_MIN(size_t, cur_ix, max_backward_limit); + const size_t max_len = num_bytes - pos; + const size_t max_zopfli_len = MaxZopfliLen(params); + const size_t max_iters = MaxZopfliCandidates(params); + size_t min_len; + size_t result = 0; + size_t k; + size_t gap = 0; + + EvaluateNode(block_start, pos, max_backward_limit, gap, starting_dist_cache, + model, queue, nodes); + + { + const PosData* posdata = StartPosQueueAt(queue, 0); + float min_cost = (posdata->cost + ZopfliCostModelGetMinCostCmd(model) + + ZopfliCostModelGetLiteralCosts(model, posdata->pos, pos)); + min_len = ComputeMinimumCopyLength(min_cost, nodes, num_bytes, pos); + } + + /* Go over the command starting positions in order of increasing cost + difference. */ + for (k = 0; k < max_iters && k < StartPosQueueSize(queue); ++k) { + const PosData* posdata = StartPosQueueAt(queue, k); + const size_t start = posdata->pos; + const uint16_t inscode = GetInsertLengthCode(pos - start); + const float start_costdiff = posdata->costdiff; + const float base_cost = start_costdiff + (float)GetInsertExtra(inscode) + + ZopfliCostModelGetLiteralCosts(model, 0, pos); + + /* Look for last distance matches using the distance cache from this + starting position. */ + size_t best_len = min_len - 1; + size_t j = 0; + for (; j < BROTLI_NUM_DISTANCE_SHORT_CODES && best_len < max_len; ++j) { + const size_t idx = kDistanceCacheIndex[j]; + const size_t backward = + (size_t)(posdata->distance_cache[idx] + kDistanceCacheOffset[j]); + size_t prev_ix = cur_ix - backward; + size_t len = 0; + uint8_t continuation = ringbuffer[cur_ix_masked + best_len]; + if (cur_ix_masked + best_len > ringbuffer_mask) { + break; + } + if (BROTLI_PREDICT_FALSE(backward > max_distance + gap)) { + /* Word dictionary -> ignore. */ + continue; + } + if (backward <= max_distance) { + /* Regular backward reference. */ + if (prev_ix >= cur_ix) { + continue; + } + + prev_ix &= ringbuffer_mask; + if (prev_ix + best_len > ringbuffer_mask || + continuation != ringbuffer[prev_ix + best_len]) { + continue; + } + len = FindMatchLengthWithLimit(&ringbuffer[prev_ix], + &ringbuffer[cur_ix_masked], + max_len); + } else { + continue; + } + { + const float dist_cost = base_cost + + ZopfliCostModelGetDistanceCost(model, j); + size_t l; + for (l = best_len + 1; l <= len; ++l) { + const uint16_t copycode = GetCopyLengthCode(l); + const uint16_t cmdcode = + CombineLengthCodes(inscode, copycode, j == 0); + const float cost = (cmdcode < 128 ? base_cost : dist_cost) + + (float)GetCopyExtra(copycode) + + ZopfliCostModelGetCommandCost(model, cmdcode); + if (cost < nodes[pos + l].u.cost) { + UpdateZopfliNode(nodes, pos, start, l, l, backward, j + 1, cost); + result = BROTLI_MAX(size_t, result, l); + } + best_len = l; + } + } + } + + /* At higher iterations look only for new last distance matches, since + looking only for new command start positions with the same distances + does not help much. */ + if (k >= 2) continue; + + { + /* Loop through all possible copy lengths at this position. */ + size_t len = min_len; + for (j = 0; j < num_matches; ++j) { + BackwardMatch match = matches[j]; + size_t dist = match.distance; + BROTLI_BOOL is_dictionary_match = + TO_BROTLI_BOOL(dist > max_distance + gap); + /* We already tried all possible last distance matches, so we can use + normal distance code here. */ + size_t dist_code = dist + BROTLI_NUM_DISTANCE_SHORT_CODES - 1; + uint16_t dist_symbol; + uint32_t distextra; + uint32_t distnumextra; + float dist_cost; + size_t max_match_len; + PrefixEncodeCopyDistance( + dist_code, params->dist.num_direct_distance_codes, + params->dist.distance_postfix_bits, &dist_symbol, &distextra); + distnumextra = dist_symbol >> 10; + dist_cost = base_cost + (float)distnumextra + + ZopfliCostModelGetDistanceCost(model, dist_symbol & 0x3FF); + + /* Try all copy lengths up until the maximum copy length corresponding + to this distance. If the distance refers to the static dictionary, or + the maximum length is long enough, try only one maximum length. */ + max_match_len = BackwardMatchLength(&match); + if (len < max_match_len && + (is_dictionary_match || max_match_len > max_zopfli_len)) { + len = max_match_len; + } + for (; len <= max_match_len; ++len) { + const size_t len_code = + is_dictionary_match ? BackwardMatchLengthCode(&match) : len; + const uint16_t copycode = GetCopyLengthCode(len_code); + const uint16_t cmdcode = CombineLengthCodes(inscode, copycode, 0); + const float cost = dist_cost + (float)GetCopyExtra(copycode) + + ZopfliCostModelGetCommandCost(model, cmdcode); + if (cost < nodes[pos + len].u.cost) { + UpdateZopfliNode(nodes, pos, start, len, len_code, dist, 0, cost); + result = BROTLI_MAX(size_t, result, len); + } + } + } + } + } + return result; +} + +static size_t ComputeShortestPathFromNodes(size_t num_bytes, + ZopfliNode* nodes) { + size_t index = num_bytes; + size_t num_commands = 0; + while ((nodes[index].dcode_insert_length & 0x7FFFFFF) == 0 && + nodes[index].length == 1) --index; + nodes[index].u.next = BROTLI_UINT32_MAX; + while (index != 0) { + size_t len = ZopfliNodeCommandLength(&nodes[index]); + index -= len; + nodes[index].u.next = (uint32_t)len; + num_commands++; + } + return num_commands; +} + +/* REQUIRES: nodes != NULL and len(nodes) >= num_bytes + 1 */ +void BrotliZopfliCreateCommands(const size_t num_bytes, + const size_t block_start, const ZopfliNode* nodes, int* dist_cache, + size_t* last_insert_len, const BrotliEncoderParams* params, + Command* commands, size_t* num_literals) { + const size_t max_backward_limit = BROTLI_MAX_BACKWARD_LIMIT(params->lgwin); + size_t pos = 0; + uint32_t offset = nodes[0].u.next; + size_t i; + size_t gap = 0; + for (i = 0; offset != BROTLI_UINT32_MAX; i++) { + const ZopfliNode* next = &nodes[pos + offset]; + size_t copy_length = ZopfliNodeCopyLength(next); + size_t insert_length = next->dcode_insert_length & 0x7FFFFFF; + pos += insert_length; + offset = next->u.next; + if (i == 0) { + insert_length += *last_insert_len; + *last_insert_len = 0; + } + { + size_t distance = ZopfliNodeCopyDistance(next); + size_t len_code = ZopfliNodeLengthCode(next); + size_t max_distance = + BROTLI_MIN(size_t, block_start + pos, max_backward_limit); + BROTLI_BOOL is_dictionary = TO_BROTLI_BOOL(distance > max_distance + gap); + size_t dist_code = ZopfliNodeDistanceCode(next); + InitCommand(&commands[i], ¶ms->dist, insert_length, + copy_length, (int)len_code - (int)copy_length, dist_code); + + if (!is_dictionary && dist_code > 0) { + dist_cache[3] = dist_cache[2]; + dist_cache[2] = dist_cache[1]; + dist_cache[1] = dist_cache[0]; + dist_cache[0] = (int)distance; + } + } + + *num_literals += insert_length; + pos += copy_length; + } + *last_insert_len += num_bytes - pos; +} + +static size_t ZopfliIterate(size_t num_bytes, size_t position, + const uint8_t* ringbuffer, size_t ringbuffer_mask, + const BrotliEncoderParams* params, const size_t gap, const int* dist_cache, + const ZopfliCostModel* model, const uint32_t* num_matches, + const BackwardMatch* matches, ZopfliNode* nodes) { + const size_t max_backward_limit = BROTLI_MAX_BACKWARD_LIMIT(params->lgwin); + const size_t max_zopfli_len = MaxZopfliLen(params); + StartPosQueue queue; + size_t cur_match_pos = 0; + size_t i; + nodes[0].length = 0; + nodes[0].u.cost = 0; + InitStartPosQueue(&queue); + for (i = 0; i + 3 < num_bytes; i++) { + size_t skip = UpdateNodes(num_bytes, position, i, ringbuffer, + ringbuffer_mask, params, max_backward_limit, dist_cache, + num_matches[i], &matches[cur_match_pos], model, &queue, nodes); + if (skip < BROTLI_LONG_COPY_QUICK_STEP) skip = 0; + cur_match_pos += num_matches[i]; + if (num_matches[i] == 1 && + BackwardMatchLength(&matches[cur_match_pos - 1]) > max_zopfli_len) { + skip = BROTLI_MAX(size_t, + BackwardMatchLength(&matches[cur_match_pos - 1]), skip); + } + if (skip > 1) { + skip--; + while (skip) { + i++; + if (i + 3 >= num_bytes) break; + EvaluateNode(position, i, max_backward_limit, gap, + dist_cache, model, &queue, nodes); + cur_match_pos += num_matches[i]; + skip--; + } + } + } + return ComputeShortestPathFromNodes(num_bytes, nodes); +} + +/* REQUIRES: nodes != NULL and len(nodes) >= num_bytes + 1 */ +size_t BrotliZopfliComputeShortestPath(MemoryManager* m, size_t num_bytes, + size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask, + const BrotliEncoderParams* params, + const int* dist_cache, HasherHandle hasher, ZopfliNode* nodes) { + const size_t max_backward_limit = BROTLI_MAX_BACKWARD_LIMIT(params->lgwin); + const size_t max_zopfli_len = MaxZopfliLen(params); + ZopfliCostModel model; + StartPosQueue queue; + BackwardMatch matches[2 * (MAX_NUM_MATCHES_H10 + 64)]; + const size_t store_end = num_bytes >= StoreLookaheadH10() ? + position + num_bytes - StoreLookaheadH10() + 1 : position; + size_t i; + size_t gap = 0; + size_t lz_matches_offset = 0; + nodes[0].length = 0; + nodes[0].u.cost = 0; + InitZopfliCostModel(m, &model, ¶ms->dist, num_bytes); + if (BROTLI_IS_OOM(m)) return 0; + ZopfliCostModelSetFromLiteralCosts( + &model, position, ringbuffer, ringbuffer_mask); + InitStartPosQueue(&queue); + for (i = 0; i + HashTypeLengthH10() - 1 < num_bytes; i++) { + const size_t pos = position + i; + const size_t max_distance = BROTLI_MIN(size_t, pos, max_backward_limit); + size_t skip; + size_t num_matches; + num_matches = FindAllMatchesH10(hasher, + ¶ms->dictionary, + ringbuffer, ringbuffer_mask, pos, num_bytes - i, max_distance, + gap, params, &matches[lz_matches_offset]); + if (num_matches > 0 && + BackwardMatchLength(&matches[num_matches - 1]) > max_zopfli_len) { + matches[0] = matches[num_matches - 1]; + num_matches = 1; + } + skip = UpdateNodes(num_bytes, position, i, ringbuffer, ringbuffer_mask, + params, max_backward_limit, dist_cache, num_matches, matches, &model, + &queue, nodes); + if (skip < BROTLI_LONG_COPY_QUICK_STEP) skip = 0; + if (num_matches == 1 && BackwardMatchLength(&matches[0]) > max_zopfli_len) { + skip = BROTLI_MAX(size_t, BackwardMatchLength(&matches[0]), skip); + } + if (skip > 1) { + /* Add the tail of the copy to the hasher. */ + StoreRangeH10(hasher, ringbuffer, ringbuffer_mask, pos + 1, BROTLI_MIN( + size_t, pos + skip, store_end)); + skip--; + while (skip) { + i++; + if (i + HashTypeLengthH10() - 1 >= num_bytes) break; + EvaluateNode(position, i, max_backward_limit, gap, + dist_cache, &model, &queue, nodes); + skip--; + } + } + } + CleanupZopfliCostModel(m, &model); + return ComputeShortestPathFromNodes(num_bytes, nodes); +} + +void BrotliCreateZopfliBackwardReferences(MemoryManager* m, size_t num_bytes, + size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask, + const BrotliEncoderParams* params, + HasherHandle hasher, int* dist_cache, size_t* last_insert_len, + Command* commands, size_t* num_commands, size_t* num_literals) { + ZopfliNode* nodes; + nodes = BROTLI_ALLOC(m, ZopfliNode, num_bytes + 1); + if (BROTLI_IS_OOM(m)) return; + BrotliInitZopfliNodes(nodes, num_bytes + 1); + *num_commands += BrotliZopfliComputeShortestPath(m, num_bytes, + position, ringbuffer, ringbuffer_mask, params, + dist_cache, hasher, nodes); + if (BROTLI_IS_OOM(m)) return; + BrotliZopfliCreateCommands(num_bytes, position, nodes, dist_cache, + last_insert_len, params, commands, num_literals); + BROTLI_FREE(m, nodes); +} + +void BrotliCreateHqZopfliBackwardReferences(MemoryManager* m, size_t num_bytes, + size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask, + const BrotliEncoderParams* params, + HasherHandle hasher, int* dist_cache, size_t* last_insert_len, + Command* commands, size_t* num_commands, size_t* num_literals) { + const size_t max_backward_limit = BROTLI_MAX_BACKWARD_LIMIT(params->lgwin); + uint32_t* num_matches = BROTLI_ALLOC(m, uint32_t, num_bytes); + size_t matches_size = 4 * num_bytes; + const size_t store_end = num_bytes >= StoreLookaheadH10() ? + position + num_bytes - StoreLookaheadH10() + 1 : position; + size_t cur_match_pos = 0; + size_t i; + size_t orig_num_literals; + size_t orig_last_insert_len; + int orig_dist_cache[4]; + size_t orig_num_commands; + ZopfliCostModel model; + ZopfliNode* nodes; + BackwardMatch* matches = BROTLI_ALLOC(m, BackwardMatch, matches_size); + size_t gap = 0; + size_t shadow_matches = 0; + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i + HashTypeLengthH10() - 1 < num_bytes; ++i) { + const size_t pos = position + i; + size_t max_distance = BROTLI_MIN(size_t, pos, max_backward_limit); + size_t max_length = num_bytes - i; + size_t num_found_matches; + size_t cur_match_end; + size_t j; + /* Ensure that we have enough free slots. */ + BROTLI_ENSURE_CAPACITY(m, BackwardMatch, matches, matches_size, + cur_match_pos + MAX_NUM_MATCHES_H10 + shadow_matches); + if (BROTLI_IS_OOM(m)) return; + num_found_matches = FindAllMatchesH10(hasher, + ¶ms->dictionary, + ringbuffer, ringbuffer_mask, pos, max_length, + max_distance, gap, params, + &matches[cur_match_pos + shadow_matches]); + cur_match_end = cur_match_pos + num_found_matches; + for (j = cur_match_pos; j + 1 < cur_match_end; ++j) { + BROTLI_DCHECK(BackwardMatchLength(&matches[j]) <= + BackwardMatchLength(&matches[j + 1])); + } + num_matches[i] = (uint32_t)num_found_matches; + if (num_found_matches > 0) { + const size_t match_len = BackwardMatchLength(&matches[cur_match_end - 1]); + if (match_len > MAX_ZOPFLI_LEN_QUALITY_11) { + const size_t skip = match_len - 1; + matches[cur_match_pos++] = matches[cur_match_end - 1]; + num_matches[i] = 1; + /* Add the tail of the copy to the hasher. */ + StoreRangeH10(hasher, ringbuffer, ringbuffer_mask, pos + 1, + BROTLI_MIN(size_t, pos + match_len, store_end)); + memset(&num_matches[i + 1], 0, skip * sizeof(num_matches[0])); + i += skip; + } else { + cur_match_pos = cur_match_end; + } + } + } + orig_num_literals = *num_literals; + orig_last_insert_len = *last_insert_len; + memcpy(orig_dist_cache, dist_cache, 4 * sizeof(dist_cache[0])); + orig_num_commands = *num_commands; + nodes = BROTLI_ALLOC(m, ZopfliNode, num_bytes + 1); + if (BROTLI_IS_OOM(m)) return; + InitZopfliCostModel(m, &model, ¶ms->dist, num_bytes); + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i < 2; i++) { + BrotliInitZopfliNodes(nodes, num_bytes + 1); + if (i == 0) { + ZopfliCostModelSetFromLiteralCosts( + &model, position, ringbuffer, ringbuffer_mask); + } else { + ZopfliCostModelSetFromCommands(&model, position, ringbuffer, + ringbuffer_mask, commands, *num_commands - orig_num_commands, + orig_last_insert_len); + } + *num_commands = orig_num_commands; + *num_literals = orig_num_literals; + *last_insert_len = orig_last_insert_len; + memcpy(dist_cache, orig_dist_cache, 4 * sizeof(dist_cache[0])); + *num_commands += ZopfliIterate(num_bytes, position, ringbuffer, + ringbuffer_mask, params, gap, dist_cache, &model, num_matches, matches, + nodes); + BrotliZopfliCreateCommands(num_bytes, position, nodes, dist_cache, + last_insert_len, params, commands, num_literals); + } + CleanupZopfliCostModel(m, &model); + BROTLI_FREE(m, nodes); + BROTLI_FREE(m, matches); + BROTLI_FREE(m, num_matches); +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/backward_references_hq.h b/modules/brotli/enc/backward_references_hq.h new file mode 100644 index 000000000..1e4275d40 --- /dev/null +++ b/modules/brotli/enc/backward_references_hq.h @@ -0,0 +1,92 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function to find backward reference copies. */ + +#ifndef BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_ +#define BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_ + +#include "../common/constants.h" +#include "../common/dictionary.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./command.h" +#include "./hash.h" +#include "./memory.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +BROTLI_INTERNAL void BrotliCreateZopfliBackwardReferences(MemoryManager* m, + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ringbuffer_mask, const BrotliEncoderParams* params, + HasherHandle hasher, int* dist_cache, size_t* last_insert_len, + Command* commands, size_t* num_commands, size_t* num_literals); + +BROTLI_INTERNAL void BrotliCreateHqZopfliBackwardReferences(MemoryManager* m, + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ringbuffer_mask, const BrotliEncoderParams* params, + HasherHandle hasher, int* dist_cache, size_t* last_insert_len, + Command* commands, size_t* num_commands, size_t* num_literals); + +typedef struct ZopfliNode { + /* Best length to get up to this byte (not including this byte itself) + highest 7 bit is used to reconstruct the length code. */ + uint32_t length; + /* Distance associated with the length. */ + uint32_t distance; + /* Number of literal inserts before this copy; highest 5 bits contain + distance short code + 1 (or zero if no short code). */ + uint32_t dcode_insert_length; + + /* This union holds information used by dynamic-programming. During forward + pass |cost| it used to store the goal function. When node is processed its + |cost| is invalidated in favor of |shortcut|. On path back-tracing pass + |next| is assigned the offset to next node on the path. */ + union { + /* Smallest cost to get to this byte from the beginning, as found so far. */ + float cost; + /* Offset to the next node on the path. Equals to command_length() of the + next node on the path. For last node equals to BROTLI_UINT32_MAX */ + uint32_t next; + /* Node position that provides next distance for distance cache. */ + uint32_t shortcut; + } u; +} ZopfliNode; + +BROTLI_INTERNAL void BrotliInitZopfliNodes(ZopfliNode* array, size_t length); + +/* Computes the shortest path of commands from position to at most + position + num_bytes. + + On return, path->size() is the number of commands found and path[i] is the + length of the i-th command (copy length plus insert length). + Note that the sum of the lengths of all commands can be less than num_bytes. + + On return, the nodes[0..num_bytes] array will have the following + "ZopfliNode array invariant": + For each i in [1..num_bytes], if nodes[i].cost < kInfinity, then + (1) nodes[i].copy_length() >= 2 + (2) nodes[i].command_length() <= i and + (3) nodes[i - nodes[i].command_length()].cost < kInfinity */ +BROTLI_INTERNAL size_t BrotliZopfliComputeShortestPath( + MemoryManager* m, size_t num_bytes, + size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask, + const BrotliEncoderParams* params, + const int* dist_cache, HasherHandle hasher, ZopfliNode* nodes); + +BROTLI_INTERNAL void BrotliZopfliCreateCommands( + const size_t num_bytes, const size_t block_start, const ZopfliNode* nodes, + int* dist_cache, size_t* last_insert_len, const BrotliEncoderParams* params, + Command* commands, size_t* num_literals); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_ */ diff --git a/modules/brotli/enc/backward_references_inc.h b/modules/brotli/enc/backward_references_inc.h new file mode 100644 index 000000000..c18cdb00c --- /dev/null +++ b/modules/brotli/enc/backward_references_inc.h @@ -0,0 +1,153 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: EXPORT_FN, FN */ + +static BROTLI_NOINLINE void EXPORT_FN(CreateBackwardReferences)( + size_t num_bytes, size_t position, + const uint8_t* ringbuffer, size_t ringbuffer_mask, + const BrotliEncoderParams* params, + HasherHandle hasher, int* dist_cache, size_t* last_insert_len, + Command* commands, size_t* num_commands, size_t* num_literals) { + /* Set maximum distance, see section 9.1. of the spec. */ + const size_t max_backward_limit = BROTLI_MAX_BACKWARD_LIMIT(params->lgwin); + + const Command* const orig_commands = commands; + size_t insert_length = *last_insert_len; + const size_t pos_end = position + num_bytes; + const size_t store_end = num_bytes >= FN(StoreLookahead)() ? + position + num_bytes - FN(StoreLookahead)() + 1 : position; + + /* For speed up heuristics for random data. */ + const size_t random_heuristics_window_size = + LiteralSpreeLengthForSparseSearch(params); + size_t apply_random_heuristics = position + random_heuristics_window_size; + const size_t gap = 0; + + /* Minimum score to accept a backward reference. */ + const score_t kMinScore = BROTLI_SCORE_BASE + 100; + + FN(PrepareDistanceCache)(hasher, dist_cache); + + while (position + FN(HashTypeLength)() < pos_end) { + size_t max_length = pos_end - position; + size_t max_distance = BROTLI_MIN(size_t, position, max_backward_limit); + HasherSearchResult sr; + sr.len = 0; + sr.len_code_delta = 0; + sr.distance = 0; + sr.score = kMinScore; + FN(FindLongestMatch)(hasher, ¶ms->dictionary, + ringbuffer, ringbuffer_mask, dist_cache, position, max_length, + max_distance, gap, params->dist.max_distance, &sr); + if (sr.score > kMinScore) { + /* Found a match. Let's look for something even better ahead. */ + int delayed_backward_references_in_row = 0; + --max_length; + for (;; --max_length) { + const score_t cost_diff_lazy = 175; + HasherSearchResult sr2; + sr2.len = params->quality < MIN_QUALITY_FOR_EXTENSIVE_REFERENCE_SEARCH ? + BROTLI_MIN(size_t, sr.len - 1, max_length) : 0; + sr2.len_code_delta = 0; + sr2.distance = 0; + sr2.score = kMinScore; + max_distance = BROTLI_MIN(size_t, position + 1, max_backward_limit); + FN(FindLongestMatch)(hasher, + ¶ms->dictionary, + ringbuffer, ringbuffer_mask, dist_cache, position + 1, max_length, + max_distance, gap, params->dist.max_distance, &sr2); + if (sr2.score >= sr.score + cost_diff_lazy) { + /* Ok, let's just write one byte for now and start a match from the + next byte. */ + ++position; + ++insert_length; + sr = sr2; + if (++delayed_backward_references_in_row < 4 && + position + FN(HashTypeLength)() < pos_end) { + continue; + } + } + break; + } + apply_random_heuristics = + position + 2 * sr.len + random_heuristics_window_size; + max_distance = BROTLI_MIN(size_t, position, max_backward_limit); + { + /* The first 16 codes are special short-codes, + and the minimum offset is 1. */ + size_t distance_code = ComputeDistanceCode( + sr.distance, max_distance + gap, dist_cache); + if ((sr.distance <= (max_distance + gap)) && distance_code > 0) { + dist_cache[3] = dist_cache[2]; + dist_cache[2] = dist_cache[1]; + dist_cache[1] = dist_cache[0]; + dist_cache[0] = (int)sr.distance; + FN(PrepareDistanceCache)(hasher, dist_cache); + } + InitCommand(commands++, ¶ms->dist, insert_length, + sr.len, sr.len_code_delta, distance_code); + } + *num_literals += insert_length; + insert_length = 0; + /* Put the hash keys into the table, if there are enough bytes left. + Depending on the hasher implementation, it can push all positions + in the given range or only a subset of them. + Avoid hash poisoning with RLE data. */ + { + size_t range_start = position + 2; + size_t range_end = BROTLI_MIN(size_t, position + sr.len, store_end); + if (sr.distance < (sr.len >> 2)) { + range_start = BROTLI_MIN(size_t, range_end, BROTLI_MAX(size_t, + range_start, position + sr.len - (sr.distance << 2))); + } + FN(StoreRange)(hasher, ringbuffer, ringbuffer_mask, range_start, + range_end); + } + position += sr.len; + } else { + ++insert_length; + ++position; + /* If we have not seen matches for a long time, we can skip some + match lookups. Unsuccessful match lookups are very very expensive + and this kind of a heuristic speeds up compression quite + a lot. */ + if (position > apply_random_heuristics) { + /* Going through uncompressible data, jump. */ + if (position > + apply_random_heuristics + 4 * random_heuristics_window_size) { + /* It is quite a long time since we saw a copy, so we assume + that this data is not compressible, and store hashes less + often. Hashes of non compressible data are less likely to + turn out to be useful in the future, too, so we store less of + them to not to flood out the hash table of good compressible + data. */ + const size_t kMargin = + BROTLI_MAX(size_t, FN(StoreLookahead)() - 1, 4); + size_t pos_jump = + BROTLI_MIN(size_t, position + 16, pos_end - kMargin); + for (; position < pos_jump; position += 4) { + FN(Store)(hasher, ringbuffer, ringbuffer_mask, position); + insert_length += 4; + } + } else { + const size_t kMargin = + BROTLI_MAX(size_t, FN(StoreLookahead)() - 1, 2); + size_t pos_jump = + BROTLI_MIN(size_t, position + 8, pos_end - kMargin); + for (; position < pos_jump; position += 2) { + FN(Store)(hasher, ringbuffer, ringbuffer_mask, position); + insert_length += 2; + } + } + } + } + } + insert_length += pos_end - position; + *last_insert_len = insert_length; + *num_commands += (size_t)(commands - orig_commands); +} diff --git a/modules/brotli/enc/bit_cost.c b/modules/brotli/enc/bit_cost.c new file mode 100644 index 000000000..1f3f7ad5c --- /dev/null +++ b/modules/brotli/enc/bit_cost.c @@ -0,0 +1,35 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Functions to estimate the bit cost of Huffman trees. */ + +#include "./bit_cost.h" + +#include "../common/constants.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./fast_log.h" +#include "./histogram.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define FN(X) X ## Literal +#include "./bit_cost_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define FN(X) X ## Command +#include "./bit_cost_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define FN(X) X ## Distance +#include "./bit_cost_inc.h" /* NOLINT(build/include) */ +#undef FN + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/bit_cost.h b/modules/brotli/enc/bit_cost.h new file mode 100644 index 000000000..6586469e6 --- /dev/null +++ b/modules/brotli/enc/bit_cost.h @@ -0,0 +1,63 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Functions to estimate the bit cost of Huffman trees. */ + +#ifndef BROTLI_ENC_BIT_COST_H_ +#define BROTLI_ENC_BIT_COST_H_ + +#include "../common/platform.h" +#include <brotli/types.h> +#include "./fast_log.h" +#include "./histogram.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static BROTLI_INLINE double ShannonEntropy( + const uint32_t* population, size_t size, size_t* total) { + size_t sum = 0; + double retval = 0; + const uint32_t* population_end = population + size; + size_t p; + if (size & 1) { + goto odd_number_of_elements_left; + } + while (population < population_end) { + p = *population++; + sum += p; + retval -= (double)p * FastLog2(p); + odd_number_of_elements_left: + p = *population++; + sum += p; + retval -= (double)p * FastLog2(p); + } + if (sum) retval += (double)sum * FastLog2(sum); + *total = sum; + return retval; +} + +static BROTLI_INLINE double BitsEntropy( + const uint32_t* population, size_t size) { + size_t sum; + double retval = ShannonEntropy(population, size, &sum); + if (retval < sum) { + /* At least one bit per literal is needed. */ + retval = (double)sum; + } + return retval; +} + +BROTLI_INTERNAL double BrotliPopulationCostLiteral(const HistogramLiteral*); +BROTLI_INTERNAL double BrotliPopulationCostCommand(const HistogramCommand*); +BROTLI_INTERNAL double BrotliPopulationCostDistance(const HistogramDistance*); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_BIT_COST_H_ */ diff --git a/modules/brotli/enc/bit_cost_inc.h b/modules/brotli/enc/bit_cost_inc.h new file mode 100644 index 000000000..453c22604 --- /dev/null +++ b/modules/brotli/enc/bit_cost_inc.h @@ -0,0 +1,127 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN */ + +#define HistogramType FN(Histogram) + +double FN(BrotliPopulationCost)(const HistogramType* histogram) { + static const double kOneSymbolHistogramCost = 12; + static const double kTwoSymbolHistogramCost = 20; + static const double kThreeSymbolHistogramCost = 28; + static const double kFourSymbolHistogramCost = 37; + const size_t data_size = FN(HistogramDataSize)(); + int count = 0; + size_t s[5]; + double bits = 0.0; + size_t i; + if (histogram->total_count_ == 0) { + return kOneSymbolHistogramCost; + } + for (i = 0; i < data_size; ++i) { + if (histogram->data_[i] > 0) { + s[count] = i; + ++count; + if (count > 4) break; + } + } + if (count == 1) { + return kOneSymbolHistogramCost; + } + if (count == 2) { + return (kTwoSymbolHistogramCost + (double)histogram->total_count_); + } + if (count == 3) { + const uint32_t histo0 = histogram->data_[s[0]]; + const uint32_t histo1 = histogram->data_[s[1]]; + const uint32_t histo2 = histogram->data_[s[2]]; + const uint32_t histomax = + BROTLI_MAX(uint32_t, histo0, BROTLI_MAX(uint32_t, histo1, histo2)); + return (kThreeSymbolHistogramCost + + 2 * (histo0 + histo1 + histo2) - histomax); + } + if (count == 4) { + uint32_t histo[4]; + uint32_t h23; + uint32_t histomax; + for (i = 0; i < 4; ++i) { + histo[i] = histogram->data_[s[i]]; + } + /* Sort */ + for (i = 0; i < 4; ++i) { + size_t j; + for (j = i + 1; j < 4; ++j) { + if (histo[j] > histo[i]) { + BROTLI_SWAP(uint32_t, histo, j, i); + } + } + } + h23 = histo[2] + histo[3]; + histomax = BROTLI_MAX(uint32_t, h23, histo[0]); + return (kFourSymbolHistogramCost + + 3 * h23 + 2 * (histo[0] + histo[1]) - histomax); + } + + { + /* In this loop we compute the entropy of the histogram and simultaneously + build a simplified histogram of the code length codes where we use the + zero repeat code 17, but we don't use the non-zero repeat code 16. */ + size_t max_depth = 1; + uint32_t depth_histo[BROTLI_CODE_LENGTH_CODES] = { 0 }; + const double log2total = FastLog2(histogram->total_count_); + for (i = 0; i < data_size;) { + if (histogram->data_[i] > 0) { + /* Compute -log2(P(symbol)) = -log2(count(symbol)/total_count) = + = log2(total_count) - log2(count(symbol)) */ + double log2p = log2total - FastLog2(histogram->data_[i]); + /* Approximate the bit depth by round(-log2(P(symbol))) */ + size_t depth = (size_t)(log2p + 0.5); + bits += histogram->data_[i] * log2p; + if (depth > 15) { + depth = 15; + } + if (depth > max_depth) { + max_depth = depth; + } + ++depth_histo[depth]; + ++i; + } else { + /* Compute the run length of zeros and add the appropriate number of 0 + and 17 code length codes to the code length code histogram. */ + uint32_t reps = 1; + size_t k; + for (k = i + 1; k < data_size && histogram->data_[k] == 0; ++k) { + ++reps; + } + i += reps; + if (i == data_size) { + /* Don't add any cost for the last zero run, since these are encoded + only implicitly. */ + break; + } + if (reps < 3) { + depth_histo[0] += reps; + } else { + reps -= 2; + while (reps > 0) { + ++depth_histo[BROTLI_REPEAT_ZERO_CODE_LENGTH]; + /* Add the 3 extra bits for the 17 code length code. */ + bits += 3; + reps >>= 3; + } + } + } + } + /* Add the estimated encoding cost of the code length code histogram. */ + bits += (double)(18 + 2 * max_depth); + /* Add the entropy of the code length code histogram. */ + bits += BitsEntropy(depth_histo, BROTLI_CODE_LENGTH_CODES); + } + return bits; +} + +#undef HistogramType diff --git a/modules/brotli/enc/block_encoder_inc.h b/modules/brotli/enc/block_encoder_inc.h new file mode 100644 index 000000000..8cbd5eac6 --- /dev/null +++ b/modules/brotli/enc/block_encoder_inc.h @@ -0,0 +1,34 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2014 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN */ + +#define HistogramType FN(Histogram) + +/* Creates entropy codes for all block types and stores them to the bit + stream. */ +static void FN(BuildAndStoreEntropyCodes)(MemoryManager* m, BlockEncoder* self, + const HistogramType* histograms, const size_t histograms_size, + const size_t alphabet_size, HuffmanTree* tree, + size_t* storage_ix, uint8_t* storage) { + const size_t table_size = histograms_size * self->histogram_length_; + self->depths_ = BROTLI_ALLOC(m, uint8_t, table_size); + self->bits_ = BROTLI_ALLOC(m, uint16_t, table_size); + if (BROTLI_IS_OOM(m)) return; + + { + size_t i; + for (i = 0; i < histograms_size; ++i) { + size_t ix = i * self->histogram_length_; + BuildAndStoreHuffmanTree(&histograms[i].data_[0], self->histogram_length_, + alphabet_size, tree, &self->depths_[ix], &self->bits_[ix], + storage_ix, storage); + } + } +} + +#undef HistogramType diff --git a/modules/brotli/enc/block_splitter.c b/modules/brotli/enc/block_splitter.c new file mode 100644 index 000000000..d308eca59 --- /dev/null +++ b/modules/brotli/enc/block_splitter.c @@ -0,0 +1,194 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Block split point selection utilities. */ + +#include "./block_splitter.h" + +#include <string.h> /* memcpy, memset */ + +#include "../common/platform.h" +#include "./bit_cost.h" +#include "./cluster.h" +#include "./command.h" +#include "./fast_log.h" +#include "./histogram.h" +#include "./memory.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static const size_t kMaxLiteralHistograms = 100; +static const size_t kMaxCommandHistograms = 50; +static const double kLiteralBlockSwitchCost = 28.1; +static const double kCommandBlockSwitchCost = 13.5; +static const double kDistanceBlockSwitchCost = 14.6; +static const size_t kLiteralStrideLength = 70; +static const size_t kCommandStrideLength = 40; +static const size_t kSymbolsPerLiteralHistogram = 544; +static const size_t kSymbolsPerCommandHistogram = 530; +static const size_t kSymbolsPerDistanceHistogram = 544; +static const size_t kMinLengthForBlockSplitting = 128; +static const size_t kIterMulForRefining = 2; +static const size_t kMinItersForRefining = 100; + +static size_t CountLiterals(const Command* cmds, const size_t num_commands) { + /* Count how many we have. */ + size_t total_length = 0; + size_t i; + for (i = 0; i < num_commands; ++i) { + total_length += cmds[i].insert_len_; + } + return total_length; +} + +static void CopyLiteralsToByteArray(const Command* cmds, + const size_t num_commands, + const uint8_t* data, + const size_t offset, + const size_t mask, + uint8_t* literals) { + size_t pos = 0; + size_t from_pos = offset & mask; + size_t i; + for (i = 0; i < num_commands; ++i) { + size_t insert_len = cmds[i].insert_len_; + if (from_pos + insert_len > mask) { + size_t head_size = mask + 1 - from_pos; + memcpy(literals + pos, data + from_pos, head_size); + from_pos = 0; + pos += head_size; + insert_len -= head_size; + } + if (insert_len > 0) { + memcpy(literals + pos, data + from_pos, insert_len); + pos += insert_len; + } + from_pos = (from_pos + insert_len + CommandCopyLen(&cmds[i])) & mask; + } +} + +static BROTLI_INLINE uint32_t MyRand(uint32_t* seed) { + /* Initial seed should be 7. In this case, loop length is (1 << 29). */ + *seed *= 16807U; + return *seed; +} + +static BROTLI_INLINE double BitCost(size_t count) { + return count == 0 ? -2.0 : FastLog2(count); +} + +#define HISTOGRAMS_PER_BATCH 64 +#define CLUSTERS_PER_BATCH 16 + +#define FN(X) X ## Literal +#define DataType uint8_t +/* NOLINTNEXTLINE(build/include) */ +#include "./block_splitter_inc.h" +#undef DataType +#undef FN + +#define FN(X) X ## Command +#define DataType uint16_t +/* NOLINTNEXTLINE(build/include) */ +#include "./block_splitter_inc.h" +#undef FN + +#define FN(X) X ## Distance +/* NOLINTNEXTLINE(build/include) */ +#include "./block_splitter_inc.h" +#undef DataType +#undef FN + +void BrotliInitBlockSplit(BlockSplit* self) { + self->num_types = 0; + self->num_blocks = 0; + self->types = 0; + self->lengths = 0; + self->types_alloc_size = 0; + self->lengths_alloc_size = 0; +} + +void BrotliDestroyBlockSplit(MemoryManager* m, BlockSplit* self) { + BROTLI_FREE(m, self->types); + BROTLI_FREE(m, self->lengths); +} + +void BrotliSplitBlock(MemoryManager* m, + const Command* cmds, + const size_t num_commands, + const uint8_t* data, + const size_t pos, + const size_t mask, + const BrotliEncoderParams* params, + BlockSplit* literal_split, + BlockSplit* insert_and_copy_split, + BlockSplit* dist_split) { + { + size_t literals_count = CountLiterals(cmds, num_commands); + uint8_t* literals = BROTLI_ALLOC(m, uint8_t, literals_count); + if (BROTLI_IS_OOM(m)) return; + /* Create a continuous array of literals. */ + CopyLiteralsToByteArray(cmds, num_commands, data, pos, mask, literals); + /* Create the block split on the array of literals. + Literal histograms have alphabet size 256. */ + SplitByteVectorLiteral( + m, literals, literals_count, + kSymbolsPerLiteralHistogram, kMaxLiteralHistograms, + kLiteralStrideLength, kLiteralBlockSwitchCost, params, + literal_split); + if (BROTLI_IS_OOM(m)) return; + BROTLI_FREE(m, literals); + } + + { + /* Compute prefix codes for commands. */ + uint16_t* insert_and_copy_codes = BROTLI_ALLOC(m, uint16_t, num_commands); + size_t i; + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i < num_commands; ++i) { + insert_and_copy_codes[i] = cmds[i].cmd_prefix_; + } + /* Create the block split on the array of command prefixes. */ + SplitByteVectorCommand( + m, insert_and_copy_codes, num_commands, + kSymbolsPerCommandHistogram, kMaxCommandHistograms, + kCommandStrideLength, kCommandBlockSwitchCost, params, + insert_and_copy_split); + if (BROTLI_IS_OOM(m)) return; + /* TODO: reuse for distances? */ + BROTLI_FREE(m, insert_and_copy_codes); + } + + { + /* Create a continuous array of distance prefixes. */ + uint16_t* distance_prefixes = BROTLI_ALLOC(m, uint16_t, num_commands); + size_t j = 0; + size_t i; + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i < num_commands; ++i) { + const Command* cmd = &cmds[i]; + if (CommandCopyLen(cmd) && cmd->cmd_prefix_ >= 128) { + distance_prefixes[j++] = cmd->dist_prefix_ & 0x3FF; + } + } + /* Create the block split on the array of distance prefixes. */ + SplitByteVectorDistance( + m, distance_prefixes, j, + kSymbolsPerDistanceHistogram, kMaxCommandHistograms, + kCommandStrideLength, kDistanceBlockSwitchCost, params, + dist_split); + if (BROTLI_IS_OOM(m)) return; + BROTLI_FREE(m, distance_prefixes); + } +} + + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/block_splitter.h b/modules/brotli/enc/block_splitter.h new file mode 100644 index 000000000..a5e006c4b --- /dev/null +++ b/modules/brotli/enc/block_splitter.h @@ -0,0 +1,51 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Block split point selection utilities. */ + +#ifndef BROTLI_ENC_BLOCK_SPLITTER_H_ +#define BROTLI_ENC_BLOCK_SPLITTER_H_ + +#include "../common/platform.h" +#include <brotli/types.h> +#include "./command.h" +#include "./memory.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +typedef struct BlockSplit { + size_t num_types; /* Amount of distinct types */ + size_t num_blocks; /* Amount of values in types and length */ + uint8_t* types; + uint32_t* lengths; + + size_t types_alloc_size; + size_t lengths_alloc_size; +} BlockSplit; + +BROTLI_INTERNAL void BrotliInitBlockSplit(BlockSplit* self); +BROTLI_INTERNAL void BrotliDestroyBlockSplit(MemoryManager* m, + BlockSplit* self); + +BROTLI_INTERNAL void BrotliSplitBlock(MemoryManager* m, + const Command* cmds, + const size_t num_commands, + const uint8_t* data, + const size_t offset, + const size_t mask, + const BrotliEncoderParams* params, + BlockSplit* literal_split, + BlockSplit* insert_and_copy_split, + BlockSplit* dist_split); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_BLOCK_SPLITTER_H_ */ diff --git a/modules/brotli/enc/block_splitter_inc.h b/modules/brotli/enc/block_splitter_inc.h new file mode 100644 index 000000000..023712b84 --- /dev/null +++ b/modules/brotli/enc/block_splitter_inc.h @@ -0,0 +1,431 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN, DataType */ + +#define HistogramType FN(Histogram) + +static void FN(InitialEntropyCodes)(const DataType* data, size_t length, + size_t stride, + size_t num_histograms, + HistogramType* histograms) { + uint32_t seed = 7; + size_t block_length = length / num_histograms; + size_t i; + FN(ClearHistograms)(histograms, num_histograms); + for (i = 0; i < num_histograms; ++i) { + size_t pos = length * i / num_histograms; + if (i != 0) { + pos += MyRand(&seed) % block_length; + } + if (pos + stride >= length) { + pos = length - stride - 1; + } + FN(HistogramAddVector)(&histograms[i], data + pos, stride); + } +} + +static void FN(RandomSample)(uint32_t* seed, + const DataType* data, + size_t length, + size_t stride, + HistogramType* sample) { + size_t pos = 0; + if (stride >= length) { + stride = length; + } else { + pos = MyRand(seed) % (length - stride + 1); + } + FN(HistogramAddVector)(sample, data + pos, stride); +} + +static void FN(RefineEntropyCodes)(const DataType* data, size_t length, + size_t stride, + size_t num_histograms, + HistogramType* histograms) { + size_t iters = + kIterMulForRefining * length / stride + kMinItersForRefining; + uint32_t seed = 7; + size_t iter; + iters = ((iters + num_histograms - 1) / num_histograms) * num_histograms; + for (iter = 0; iter < iters; ++iter) { + HistogramType sample; + FN(HistogramClear)(&sample); + FN(RandomSample)(&seed, data, length, stride, &sample); + FN(HistogramAddHistogram)(&histograms[iter % num_histograms], &sample); + } +} + +/* Assigns a block id from the range [0, num_histograms) to each data element + in data[0..length) and fills in block_id[0..length) with the assigned values. + Returns the number of blocks, i.e. one plus the number of block switches. */ +static size_t FN(FindBlocks)(const DataType* data, const size_t length, + const double block_switch_bitcost, + const size_t num_histograms, + const HistogramType* histograms, + double* insert_cost, + double* cost, + uint8_t* switch_signal, + uint8_t* block_id) { + const size_t data_size = FN(HistogramDataSize)(); + const size_t bitmaplen = (num_histograms + 7) >> 3; + size_t num_blocks = 1; + size_t i; + size_t j; + BROTLI_DCHECK(num_histograms <= 256); + if (num_histograms <= 1) { + for (i = 0; i < length; ++i) { + block_id[i] = 0; + } + return 1; + } + memset(insert_cost, 0, sizeof(insert_cost[0]) * data_size * num_histograms); + for (i = 0; i < num_histograms; ++i) { + insert_cost[i] = FastLog2((uint32_t)histograms[i].total_count_); + } + for (i = data_size; i != 0;) { + --i; + for (j = 0; j < num_histograms; ++j) { + insert_cost[i * num_histograms + j] = + insert_cost[j] - BitCost(histograms[j].data_[i]); + } + } + memset(cost, 0, sizeof(cost[0]) * num_histograms); + memset(switch_signal, 0, sizeof(switch_signal[0]) * length * bitmaplen); + /* After each iteration of this loop, cost[k] will contain the difference + between the minimum cost of arriving at the current byte position using + entropy code k, and the minimum cost of arriving at the current byte + position. This difference is capped at the block switch cost, and if it + reaches block switch cost, it means that when we trace back from the last + position, we need to switch here. */ + for (i = 0; i < length; ++i) { + const size_t byte_ix = i; + size_t ix = byte_ix * bitmaplen; + size_t insert_cost_ix = data[byte_ix] * num_histograms; + double min_cost = 1e99; + double block_switch_cost = block_switch_bitcost; + size_t k; + for (k = 0; k < num_histograms; ++k) { + /* We are coding the symbol in data[byte_ix] with entropy code k. */ + cost[k] += insert_cost[insert_cost_ix + k]; + if (cost[k] < min_cost) { + min_cost = cost[k]; + block_id[byte_ix] = (uint8_t)k; + } + } + /* More blocks for the beginning. */ + if (byte_ix < 2000) { + block_switch_cost *= 0.77 + 0.07 * (double)byte_ix / 2000; + } + for (k = 0; k < num_histograms; ++k) { + cost[k] -= min_cost; + if (cost[k] >= block_switch_cost) { + const uint8_t mask = (uint8_t)(1u << (k & 7)); + cost[k] = block_switch_cost; + BROTLI_DCHECK((k >> 3) < bitmaplen); + switch_signal[ix + (k >> 3)] |= mask; + } + } + } + { /* Trace back from the last position and switch at the marked places. */ + size_t byte_ix = length - 1; + size_t ix = byte_ix * bitmaplen; + uint8_t cur_id = block_id[byte_ix]; + while (byte_ix > 0) { + const uint8_t mask = (uint8_t)(1u << (cur_id & 7)); + BROTLI_DCHECK(((size_t)cur_id >> 3) < bitmaplen); + --byte_ix; + ix -= bitmaplen; + if (switch_signal[ix + (cur_id >> 3)] & mask) { + if (cur_id != block_id[byte_ix]) { + cur_id = block_id[byte_ix]; + ++num_blocks; + } + } + block_id[byte_ix] = cur_id; + } + } + return num_blocks; +} + +static size_t FN(RemapBlockIds)(uint8_t* block_ids, const size_t length, + uint16_t* new_id, const size_t num_histograms) { + static const uint16_t kInvalidId = 256; + uint16_t next_id = 0; + size_t i; + for (i = 0; i < num_histograms; ++i) { + new_id[i] = kInvalidId; + } + for (i = 0; i < length; ++i) { + BROTLI_DCHECK(block_ids[i] < num_histograms); + if (new_id[block_ids[i]] == kInvalidId) { + new_id[block_ids[i]] = next_id++; + } + } + for (i = 0; i < length; ++i) { + block_ids[i] = (uint8_t)new_id[block_ids[i]]; + BROTLI_DCHECK(block_ids[i] < num_histograms); + } + BROTLI_DCHECK(next_id <= num_histograms); + return next_id; +} + +static void FN(BuildBlockHistograms)(const DataType* data, const size_t length, + const uint8_t* block_ids, + const size_t num_histograms, + HistogramType* histograms) { + size_t i; + FN(ClearHistograms)(histograms, num_histograms); + for (i = 0; i < length; ++i) { + FN(HistogramAdd)(&histograms[block_ids[i]], data[i]); + } +} + +static void FN(ClusterBlocks)(MemoryManager* m, + const DataType* data, const size_t length, + const size_t num_blocks, + uint8_t* block_ids, + BlockSplit* split) { + uint32_t* histogram_symbols = BROTLI_ALLOC(m, uint32_t, num_blocks); + uint32_t* block_lengths = BROTLI_ALLOC(m, uint32_t, num_blocks); + const size_t expected_num_clusters = CLUSTERS_PER_BATCH * + (num_blocks + HISTOGRAMS_PER_BATCH - 1) / HISTOGRAMS_PER_BATCH; + size_t all_histograms_size = 0; + size_t all_histograms_capacity = expected_num_clusters; + HistogramType* all_histograms = + BROTLI_ALLOC(m, HistogramType, all_histograms_capacity); + size_t cluster_size_size = 0; + size_t cluster_size_capacity = expected_num_clusters; + uint32_t* cluster_size = BROTLI_ALLOC(m, uint32_t, cluster_size_capacity); + size_t num_clusters = 0; + HistogramType* histograms = BROTLI_ALLOC(m, HistogramType, + BROTLI_MIN(size_t, num_blocks, HISTOGRAMS_PER_BATCH)); + size_t max_num_pairs = + HISTOGRAMS_PER_BATCH * HISTOGRAMS_PER_BATCH / 2; + size_t pairs_capacity = max_num_pairs + 1; + HistogramPair* pairs = BROTLI_ALLOC(m, HistogramPair, pairs_capacity); + size_t pos = 0; + uint32_t* clusters; + size_t num_final_clusters; + static const uint32_t kInvalidIndex = BROTLI_UINT32_MAX; + uint32_t* new_index; + size_t i; + uint32_t sizes[HISTOGRAMS_PER_BATCH] = { 0 }; + uint32_t new_clusters[HISTOGRAMS_PER_BATCH] = { 0 }; + uint32_t symbols[HISTOGRAMS_PER_BATCH] = { 0 }; + uint32_t remap[HISTOGRAMS_PER_BATCH] = { 0 }; + + if (BROTLI_IS_OOM(m)) return; + + memset(block_lengths, 0, num_blocks * sizeof(uint32_t)); + + { + size_t block_idx = 0; + for (i = 0; i < length; ++i) { + BROTLI_DCHECK(block_idx < num_blocks); + ++block_lengths[block_idx]; + if (i + 1 == length || block_ids[i] != block_ids[i + 1]) { + ++block_idx; + } + } + BROTLI_DCHECK(block_idx == num_blocks); + } + + for (i = 0; i < num_blocks; i += HISTOGRAMS_PER_BATCH) { + const size_t num_to_combine = + BROTLI_MIN(size_t, num_blocks - i, HISTOGRAMS_PER_BATCH); + size_t num_new_clusters; + size_t j; + for (j = 0; j < num_to_combine; ++j) { + size_t k; + FN(HistogramClear)(&histograms[j]); + for (k = 0; k < block_lengths[i + j]; ++k) { + FN(HistogramAdd)(&histograms[j], data[pos++]); + } + histograms[j].bit_cost_ = FN(BrotliPopulationCost)(&histograms[j]); + new_clusters[j] = (uint32_t)j; + symbols[j] = (uint32_t)j; + sizes[j] = 1; + } + num_new_clusters = FN(BrotliHistogramCombine)( + histograms, sizes, symbols, new_clusters, pairs, num_to_combine, + num_to_combine, HISTOGRAMS_PER_BATCH, max_num_pairs); + BROTLI_ENSURE_CAPACITY(m, HistogramType, all_histograms, + all_histograms_capacity, all_histograms_size + num_new_clusters); + BROTLI_ENSURE_CAPACITY(m, uint32_t, cluster_size, + cluster_size_capacity, cluster_size_size + num_new_clusters); + if (BROTLI_IS_OOM(m)) return; + for (j = 0; j < num_new_clusters; ++j) { + all_histograms[all_histograms_size++] = histograms[new_clusters[j]]; + cluster_size[cluster_size_size++] = sizes[new_clusters[j]]; + remap[new_clusters[j]] = (uint32_t)j; + } + for (j = 0; j < num_to_combine; ++j) { + histogram_symbols[i + j] = (uint32_t)num_clusters + remap[symbols[j]]; + } + num_clusters += num_new_clusters; + BROTLI_DCHECK(num_clusters == cluster_size_size); + BROTLI_DCHECK(num_clusters == all_histograms_size); + } + BROTLI_FREE(m, histograms); + + max_num_pairs = + BROTLI_MIN(size_t, 64 * num_clusters, (num_clusters / 2) * num_clusters); + if (pairs_capacity < max_num_pairs + 1) { + BROTLI_FREE(m, pairs); + pairs = BROTLI_ALLOC(m, HistogramPair, max_num_pairs + 1); + if (BROTLI_IS_OOM(m)) return; + } + + clusters = BROTLI_ALLOC(m, uint32_t, num_clusters); + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i < num_clusters; ++i) { + clusters[i] = (uint32_t)i; + } + num_final_clusters = FN(BrotliHistogramCombine)( + all_histograms, cluster_size, histogram_symbols, clusters, pairs, + num_clusters, num_blocks, BROTLI_MAX_NUMBER_OF_BLOCK_TYPES, + max_num_pairs); + BROTLI_FREE(m, pairs); + BROTLI_FREE(m, cluster_size); + + new_index = BROTLI_ALLOC(m, uint32_t, num_clusters); + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i < num_clusters; ++i) new_index[i] = kInvalidIndex; + pos = 0; + { + uint32_t next_index = 0; + for (i = 0; i < num_blocks; ++i) { + HistogramType histo; + size_t j; + uint32_t best_out; + double best_bits; + FN(HistogramClear)(&histo); + for (j = 0; j < block_lengths[i]; ++j) { + FN(HistogramAdd)(&histo, data[pos++]); + } + best_out = (i == 0) ? histogram_symbols[0] : histogram_symbols[i - 1]; + best_bits = + FN(BrotliHistogramBitCostDistance)(&histo, &all_histograms[best_out]); + for (j = 0; j < num_final_clusters; ++j) { + const double cur_bits = FN(BrotliHistogramBitCostDistance)( + &histo, &all_histograms[clusters[j]]); + if (cur_bits < best_bits) { + best_bits = cur_bits; + best_out = clusters[j]; + } + } + histogram_symbols[i] = best_out; + if (new_index[best_out] == kInvalidIndex) { + new_index[best_out] = next_index++; + } + } + } + BROTLI_FREE(m, clusters); + BROTLI_FREE(m, all_histograms); + BROTLI_ENSURE_CAPACITY( + m, uint8_t, split->types, split->types_alloc_size, num_blocks); + BROTLI_ENSURE_CAPACITY( + m, uint32_t, split->lengths, split->lengths_alloc_size, num_blocks); + if (BROTLI_IS_OOM(m)) return; + { + uint32_t cur_length = 0; + size_t block_idx = 0; + uint8_t max_type = 0; + for (i = 0; i < num_blocks; ++i) { + cur_length += block_lengths[i]; + if (i + 1 == num_blocks || + histogram_symbols[i] != histogram_symbols[i + 1]) { + const uint8_t id = (uint8_t)new_index[histogram_symbols[i]]; + split->types[block_idx] = id; + split->lengths[block_idx] = cur_length; + max_type = BROTLI_MAX(uint8_t, max_type, id); + cur_length = 0; + ++block_idx; + } + } + split->num_blocks = block_idx; + split->num_types = (size_t)max_type + 1; + } + BROTLI_FREE(m, new_index); + BROTLI_FREE(m, block_lengths); + BROTLI_FREE(m, histogram_symbols); +} + +static void FN(SplitByteVector)(MemoryManager* m, + const DataType* data, const size_t length, + const size_t literals_per_histogram, + const size_t max_histograms, + const size_t sampling_stride_length, + const double block_switch_cost, + const BrotliEncoderParams* params, + BlockSplit* split) { + const size_t data_size = FN(HistogramDataSize)(); + size_t num_histograms = length / literals_per_histogram + 1; + HistogramType* histograms; + if (num_histograms > max_histograms) { + num_histograms = max_histograms; + } + if (length == 0) { + split->num_types = 1; + return; + } else if (length < kMinLengthForBlockSplitting) { + BROTLI_ENSURE_CAPACITY(m, uint8_t, + split->types, split->types_alloc_size, split->num_blocks + 1); + BROTLI_ENSURE_CAPACITY(m, uint32_t, + split->lengths, split->lengths_alloc_size, split->num_blocks + 1); + if (BROTLI_IS_OOM(m)) return; + split->num_types = 1; + split->types[split->num_blocks] = 0; + split->lengths[split->num_blocks] = (uint32_t)length; + split->num_blocks++; + return; + } + histograms = BROTLI_ALLOC(m, HistogramType, num_histograms); + if (BROTLI_IS_OOM(m)) return; + /* Find good entropy codes. */ + FN(InitialEntropyCodes)(data, length, + sampling_stride_length, + num_histograms, histograms); + FN(RefineEntropyCodes)(data, length, + sampling_stride_length, + num_histograms, histograms); + { + /* Find a good path through literals with the good entropy codes. */ + uint8_t* block_ids = BROTLI_ALLOC(m, uint8_t, length); + size_t num_blocks = 0; + const size_t bitmaplen = (num_histograms + 7) >> 3; + double* insert_cost = BROTLI_ALLOC(m, double, data_size * num_histograms); + double* cost = BROTLI_ALLOC(m, double, num_histograms); + uint8_t* switch_signal = BROTLI_ALLOC(m, uint8_t, length * bitmaplen); + uint16_t* new_id = BROTLI_ALLOC(m, uint16_t, num_histograms); + const size_t iters = params->quality < HQ_ZOPFLIFICATION_QUALITY ? 3 : 10; + size_t i; + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i < iters; ++i) { + num_blocks = FN(FindBlocks)(data, length, + block_switch_cost, + num_histograms, histograms, + insert_cost, cost, switch_signal, + block_ids); + num_histograms = FN(RemapBlockIds)(block_ids, length, + new_id, num_histograms); + FN(BuildBlockHistograms)(data, length, block_ids, + num_histograms, histograms); + } + BROTLI_FREE(m, insert_cost); + BROTLI_FREE(m, cost); + BROTLI_FREE(m, switch_signal); + BROTLI_FREE(m, new_id); + BROTLI_FREE(m, histograms); + FN(ClusterBlocks)(m, data, length, num_blocks, block_ids, split); + if (BROTLI_IS_OOM(m)) return; + BROTLI_FREE(m, block_ids); + } +} + +#undef HistogramType diff --git a/modules/brotli/enc/brotli_bit_stream.c b/modules/brotli/enc/brotli_bit_stream.c new file mode 100644 index 000000000..aaf2dad7d --- /dev/null +++ b/modules/brotli/enc/brotli_bit_stream.c @@ -0,0 +1,1331 @@ +/* Copyright 2014 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Brotli bit stream functions to support the low level format. There are no + compression algorithms here, just the right ordering of bits to match the + specs. */ + +#include "./brotli_bit_stream.h" + +#include <string.h> /* memcpy, memset */ + +#include "../common/constants.h" +#include "../common/context.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./entropy_encode.h" +#include "./entropy_encode_static.h" +#include "./fast_log.h" +#include "./histogram.h" +#include "./memory.h" +#include "./write_bits.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define MAX_HUFFMAN_TREE_SIZE (2 * BROTLI_NUM_COMMAND_SYMBOLS + 1) +/* The maximum size of Huffman dictionary for distances assuming that + NPOSTFIX = 0 and NDIRECT = 0. */ +#define MAX_SIMPLE_DISTANCE_ALPHABET_SIZE \ + BROTLI_DISTANCE_ALPHABET_SIZE(0, 0, BROTLI_LARGE_MAX_DISTANCE_BITS) +/* MAX_SIMPLE_DISTANCE_ALPHABET_SIZE == 140 */ + +/* Represents the range of values belonging to a prefix code: + [offset, offset + 2^nbits) */ +typedef struct PrefixCodeRange { + uint32_t offset; + uint32_t nbits; +} PrefixCodeRange; + +static const PrefixCodeRange + kBlockLengthPrefixCode[BROTLI_NUM_BLOCK_LEN_SYMBOLS] = { + { 1, 2}, { 5, 2}, { 9, 2}, {13, 2}, {17, 3}, { 25, 3}, { 33, 3}, + {41, 3}, {49, 4}, {65, 4}, {81, 4}, {97, 4}, {113, 5}, {145, 5}, + {177, 5}, { 209, 5}, { 241, 6}, { 305, 6}, { 369, 7}, { 497, 8}, + {753, 9}, {1265, 10}, {2289, 11}, {4337, 12}, {8433, 13}, {16625, 24} +}; + +static BROTLI_INLINE uint32_t BlockLengthPrefixCode(uint32_t len) { + uint32_t code = (len >= 177) ? (len >= 753 ? 20 : 14) : (len >= 41 ? 7 : 0); + while (code < (BROTLI_NUM_BLOCK_LEN_SYMBOLS - 1) && + len >= kBlockLengthPrefixCode[code + 1].offset) ++code; + return code; +} + +static BROTLI_INLINE void GetBlockLengthPrefixCode(uint32_t len, size_t* code, + uint32_t* n_extra, uint32_t* extra) { + *code = BlockLengthPrefixCode(len); + *n_extra = kBlockLengthPrefixCode[*code].nbits; + *extra = len - kBlockLengthPrefixCode[*code].offset; +} + +typedef struct BlockTypeCodeCalculator { + size_t last_type; + size_t second_last_type; +} BlockTypeCodeCalculator; + +static void InitBlockTypeCodeCalculator(BlockTypeCodeCalculator* self) { + self->last_type = 1; + self->second_last_type = 0; +} + +static BROTLI_INLINE size_t NextBlockTypeCode( + BlockTypeCodeCalculator* calculator, uint8_t type) { + size_t type_code = (type == calculator->last_type + 1) ? 1u : + (type == calculator->second_last_type) ? 0u : type + 2u; + calculator->second_last_type = calculator->last_type; + calculator->last_type = type; + return type_code; +} + +/* |nibblesbits| represents the 2 bits to encode MNIBBLES (0-3) + REQUIRES: length > 0 + REQUIRES: length <= (1 << 24) */ +static void BrotliEncodeMlen(size_t length, uint64_t* bits, + size_t* numbits, uint64_t* nibblesbits) { + size_t lg = (length == 1) ? 1 : Log2FloorNonZero((uint32_t)(length - 1)) + 1; + size_t mnibbles = (lg < 16 ? 16 : (lg + 3)) / 4; + BROTLI_DCHECK(length > 0); + BROTLI_DCHECK(length <= (1 << 24)); + BROTLI_DCHECK(lg <= 24); + *nibblesbits = mnibbles - 4; + *numbits = mnibbles * 4; + *bits = length - 1; +} + +static BROTLI_INLINE void StoreCommandExtra( + const Command* cmd, size_t* storage_ix, uint8_t* storage) { + uint32_t copylen_code = CommandCopyLenCode(cmd); + uint16_t inscode = GetInsertLengthCode(cmd->insert_len_); + uint16_t copycode = GetCopyLengthCode(copylen_code); + uint32_t insnumextra = GetInsertExtra(inscode); + uint64_t insextraval = cmd->insert_len_ - GetInsertBase(inscode); + uint64_t copyextraval = copylen_code - GetCopyBase(copycode); + uint64_t bits = (copyextraval << insnumextra) | insextraval; + BrotliWriteBits( + insnumextra + GetCopyExtra(copycode), bits, storage_ix, storage); +} + +/* Data structure that stores almost everything that is needed to encode each + block switch command. */ +typedef struct BlockSplitCode { + BlockTypeCodeCalculator type_code_calculator; + uint8_t type_depths[BROTLI_MAX_BLOCK_TYPE_SYMBOLS]; + uint16_t type_bits[BROTLI_MAX_BLOCK_TYPE_SYMBOLS]; + uint8_t length_depths[BROTLI_NUM_BLOCK_LEN_SYMBOLS]; + uint16_t length_bits[BROTLI_NUM_BLOCK_LEN_SYMBOLS]; +} BlockSplitCode; + +/* Stores a number between 0 and 255. */ +static void StoreVarLenUint8(size_t n, size_t* storage_ix, uint8_t* storage) { + if (n == 0) { + BrotliWriteBits(1, 0, storage_ix, storage); + } else { + size_t nbits = Log2FloorNonZero(n); + BrotliWriteBits(1, 1, storage_ix, storage); + BrotliWriteBits(3, nbits, storage_ix, storage); + BrotliWriteBits(nbits, n - ((size_t)1 << nbits), storage_ix, storage); + } +} + +/* Stores the compressed meta-block header. + REQUIRES: length > 0 + REQUIRES: length <= (1 << 24) */ +static void StoreCompressedMetaBlockHeader(BROTLI_BOOL is_final_block, + size_t length, + size_t* storage_ix, + uint8_t* storage) { + uint64_t lenbits; + size_t nlenbits; + uint64_t nibblesbits; + + /* Write ISLAST bit. */ + BrotliWriteBits(1, (uint64_t)is_final_block, storage_ix, storage); + /* Write ISEMPTY bit. */ + if (is_final_block) { + BrotliWriteBits(1, 0, storage_ix, storage); + } + + BrotliEncodeMlen(length, &lenbits, &nlenbits, &nibblesbits); + BrotliWriteBits(2, nibblesbits, storage_ix, storage); + BrotliWriteBits(nlenbits, lenbits, storage_ix, storage); + + if (!is_final_block) { + /* Write ISUNCOMPRESSED bit. */ + BrotliWriteBits(1, 0, storage_ix, storage); + } +} + +/* Stores the uncompressed meta-block header. + REQUIRES: length > 0 + REQUIRES: length <= (1 << 24) */ +static void BrotliStoreUncompressedMetaBlockHeader(size_t length, + size_t* storage_ix, + uint8_t* storage) { + uint64_t lenbits; + size_t nlenbits; + uint64_t nibblesbits; + + /* Write ISLAST bit. + Uncompressed block cannot be the last one, so set to 0. */ + BrotliWriteBits(1, 0, storage_ix, storage); + BrotliEncodeMlen(length, &lenbits, &nlenbits, &nibblesbits); + BrotliWriteBits(2, nibblesbits, storage_ix, storage); + BrotliWriteBits(nlenbits, lenbits, storage_ix, storage); + /* Write ISUNCOMPRESSED bit. */ + BrotliWriteBits(1, 1, storage_ix, storage); +} + +static void BrotliStoreHuffmanTreeOfHuffmanTreeToBitMask( + const int num_codes, const uint8_t* code_length_bitdepth, + size_t* storage_ix, uint8_t* storage) { + static const uint8_t kStorageOrder[BROTLI_CODE_LENGTH_CODES] = { + 1, 2, 3, 4, 0, 5, 17, 6, 16, 7, 8, 9, 10, 11, 12, 13, 14, 15 + }; + /* The bit lengths of the Huffman code over the code length alphabet + are compressed with the following static Huffman code: + Symbol Code + ------ ---- + 0 00 + 1 1110 + 2 110 + 3 01 + 4 10 + 5 1111 */ + static const uint8_t kHuffmanBitLengthHuffmanCodeSymbols[6] = { + 0, 7, 3, 2, 1, 15 + }; + static const uint8_t kHuffmanBitLengthHuffmanCodeBitLengths[6] = { + 2, 4, 3, 2, 2, 4 + }; + + size_t skip_some = 0; /* skips none. */ + + /* Throw away trailing zeros: */ + size_t codes_to_store = BROTLI_CODE_LENGTH_CODES; + if (num_codes > 1) { + for (; codes_to_store > 0; --codes_to_store) { + if (code_length_bitdepth[kStorageOrder[codes_to_store - 1]] != 0) { + break; + } + } + } + if (code_length_bitdepth[kStorageOrder[0]] == 0 && + code_length_bitdepth[kStorageOrder[1]] == 0) { + skip_some = 2; /* skips two. */ + if (code_length_bitdepth[kStorageOrder[2]] == 0) { + skip_some = 3; /* skips three. */ + } + } + BrotliWriteBits(2, skip_some, storage_ix, storage); + { + size_t i; + for (i = skip_some; i < codes_to_store; ++i) { + size_t l = code_length_bitdepth[kStorageOrder[i]]; + BrotliWriteBits(kHuffmanBitLengthHuffmanCodeBitLengths[l], + kHuffmanBitLengthHuffmanCodeSymbols[l], storage_ix, storage); + } + } +} + +static void BrotliStoreHuffmanTreeToBitMask( + const size_t huffman_tree_size, const uint8_t* huffman_tree, + const uint8_t* huffman_tree_extra_bits, const uint8_t* code_length_bitdepth, + const uint16_t* code_length_bitdepth_symbols, + size_t* BROTLI_RESTRICT storage_ix, uint8_t* BROTLI_RESTRICT storage) { + size_t i; + for (i = 0; i < huffman_tree_size; ++i) { + size_t ix = huffman_tree[i]; + BrotliWriteBits(code_length_bitdepth[ix], code_length_bitdepth_symbols[ix], + storage_ix, storage); + /* Extra bits */ + switch (ix) { + case BROTLI_REPEAT_PREVIOUS_CODE_LENGTH: + BrotliWriteBits(2, huffman_tree_extra_bits[i], storage_ix, storage); + break; + case BROTLI_REPEAT_ZERO_CODE_LENGTH: + BrotliWriteBits(3, huffman_tree_extra_bits[i], storage_ix, storage); + break; + } + } +} + +static void StoreSimpleHuffmanTree(const uint8_t* depths, + size_t symbols[4], + size_t num_symbols, + size_t max_bits, + size_t* storage_ix, uint8_t* storage) { + /* value of 1 indicates a simple Huffman code */ + BrotliWriteBits(2, 1, storage_ix, storage); + BrotliWriteBits(2, num_symbols - 1, storage_ix, storage); /* NSYM - 1 */ + + { + /* Sort */ + size_t i; + for (i = 0; i < num_symbols; i++) { + size_t j; + for (j = i + 1; j < num_symbols; j++) { + if (depths[symbols[j]] < depths[symbols[i]]) { + BROTLI_SWAP(size_t, symbols, j, i); + } + } + } + } + + if (num_symbols == 2) { + BrotliWriteBits(max_bits, symbols[0], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[1], storage_ix, storage); + } else if (num_symbols == 3) { + BrotliWriteBits(max_bits, symbols[0], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[1], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[2], storage_ix, storage); + } else { + BrotliWriteBits(max_bits, symbols[0], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[1], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[2], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[3], storage_ix, storage); + /* tree-select */ + BrotliWriteBits(1, depths[symbols[0]] == 1 ? 1 : 0, storage_ix, storage); + } +} + +/* num = alphabet size + depths = symbol depths */ +void BrotliStoreHuffmanTree(const uint8_t* depths, size_t num, + HuffmanTree* tree, + size_t* storage_ix, uint8_t* storage) { + /* Write the Huffman tree into the brotli-representation. + The command alphabet is the largest, so this allocation will fit all + alphabets. */ + uint8_t huffman_tree[BROTLI_NUM_COMMAND_SYMBOLS]; + uint8_t huffman_tree_extra_bits[BROTLI_NUM_COMMAND_SYMBOLS]; + size_t huffman_tree_size = 0; + uint8_t code_length_bitdepth[BROTLI_CODE_LENGTH_CODES] = { 0 }; + uint16_t code_length_bitdepth_symbols[BROTLI_CODE_LENGTH_CODES]; + uint32_t huffman_tree_histogram[BROTLI_CODE_LENGTH_CODES] = { 0 }; + size_t i; + int num_codes = 0; + size_t code = 0; + + BROTLI_DCHECK(num <= BROTLI_NUM_COMMAND_SYMBOLS); + + BrotliWriteHuffmanTree(depths, num, &huffman_tree_size, huffman_tree, + huffman_tree_extra_bits); + + /* Calculate the statistics of the Huffman tree in brotli-representation. */ + for (i = 0; i < huffman_tree_size; ++i) { + ++huffman_tree_histogram[huffman_tree[i]]; + } + + for (i = 0; i < BROTLI_CODE_LENGTH_CODES; ++i) { + if (huffman_tree_histogram[i]) { + if (num_codes == 0) { + code = i; + num_codes = 1; + } else if (num_codes == 1) { + num_codes = 2; + break; + } + } + } + + /* Calculate another Huffman tree to use for compressing both the + earlier Huffman tree with. */ + BrotliCreateHuffmanTree(huffman_tree_histogram, BROTLI_CODE_LENGTH_CODES, + 5, tree, code_length_bitdepth); + BrotliConvertBitDepthsToSymbols(code_length_bitdepth, + BROTLI_CODE_LENGTH_CODES, + code_length_bitdepth_symbols); + + /* Now, we have all the data, let's start storing it */ + BrotliStoreHuffmanTreeOfHuffmanTreeToBitMask(num_codes, code_length_bitdepth, + storage_ix, storage); + + if (num_codes == 1) { + code_length_bitdepth[code] = 0; + } + + /* Store the real Huffman tree now. */ + BrotliStoreHuffmanTreeToBitMask(huffman_tree_size, + huffman_tree, + huffman_tree_extra_bits, + code_length_bitdepth, + code_length_bitdepth_symbols, + storage_ix, storage); +} + +/* Builds a Huffman tree from histogram[0:length] into depth[0:length] and + bits[0:length] and stores the encoded tree to the bit stream. */ +static void BuildAndStoreHuffmanTree(const uint32_t* histogram, + const size_t histogram_length, + const size_t alphabet_size, + HuffmanTree* tree, + uint8_t* depth, + uint16_t* bits, + size_t* storage_ix, + uint8_t* storage) { + size_t count = 0; + size_t s4[4] = { 0 }; + size_t i; + size_t max_bits = 0; + for (i = 0; i < histogram_length; i++) { + if (histogram[i]) { + if (count < 4) { + s4[count] = i; + } else if (count > 4) { + break; + } + count++; + } + } + + { + size_t max_bits_counter = alphabet_size - 1; + while (max_bits_counter) { + max_bits_counter >>= 1; + ++max_bits; + } + } + + if (count <= 1) { + BrotliWriteBits(4, 1, storage_ix, storage); + BrotliWriteBits(max_bits, s4[0], storage_ix, storage); + depth[s4[0]] = 0; + bits[s4[0]] = 0; + return; + } + + memset(depth, 0, histogram_length * sizeof(depth[0])); + BrotliCreateHuffmanTree(histogram, histogram_length, 15, tree, depth); + BrotliConvertBitDepthsToSymbols(depth, histogram_length, bits); + + if (count <= 4) { + StoreSimpleHuffmanTree(depth, s4, count, max_bits, storage_ix, storage); + } else { + BrotliStoreHuffmanTree(depth, histogram_length, tree, storage_ix, storage); + } +} + +static BROTLI_INLINE BROTLI_BOOL SortHuffmanTree( + const HuffmanTree* v0, const HuffmanTree* v1) { + return TO_BROTLI_BOOL(v0->total_count_ < v1->total_count_); +} + +void BrotliBuildAndStoreHuffmanTreeFast(MemoryManager* m, + const uint32_t* histogram, + const size_t histogram_total, + const size_t max_bits, + uint8_t* depth, uint16_t* bits, + size_t* storage_ix, + uint8_t* storage) { + size_t count = 0; + size_t symbols[4] = { 0 }; + size_t length = 0; + size_t total = histogram_total; + while (total != 0) { + if (histogram[length]) { + if (count < 4) { + symbols[count] = length; + } + ++count; + total -= histogram[length]; + } + ++length; + } + + if (count <= 1) { + BrotliWriteBits(4, 1, storage_ix, storage); + BrotliWriteBits(max_bits, symbols[0], storage_ix, storage); + depth[symbols[0]] = 0; + bits[symbols[0]] = 0; + return; + } + + memset(depth, 0, length * sizeof(depth[0])); + { + const size_t max_tree_size = 2 * length + 1; + HuffmanTree* tree = BROTLI_ALLOC(m, HuffmanTree, max_tree_size); + uint32_t count_limit; + if (BROTLI_IS_OOM(m)) return; + for (count_limit = 1; ; count_limit *= 2) { + HuffmanTree* node = tree; + size_t l; + for (l = length; l != 0;) { + --l; + if (histogram[l]) { + if (BROTLI_PREDICT_TRUE(histogram[l] >= count_limit)) { + InitHuffmanTree(node, histogram[l], -1, (int16_t)l); + } else { + InitHuffmanTree(node, count_limit, -1, (int16_t)l); + } + ++node; + } + } + { + const int n = (int)(node - tree); + HuffmanTree sentinel; + int i = 0; /* Points to the next leaf node. */ + int j = n + 1; /* Points to the next non-leaf node. */ + int k; + + SortHuffmanTreeItems(tree, (size_t)n, SortHuffmanTree); + /* The nodes are: + [0, n): the sorted leaf nodes that we start with. + [n]: we add a sentinel here. + [n + 1, 2n): new parent nodes are added here, starting from + (n+1). These are naturally in ascending order. + [2n]: we add a sentinel at the end as well. + There will be (2n+1) elements at the end. */ + InitHuffmanTree(&sentinel, BROTLI_UINT32_MAX, -1, -1); + *node++ = sentinel; + *node++ = sentinel; + + for (k = n - 1; k > 0; --k) { + int left, right; + if (tree[i].total_count_ <= tree[j].total_count_) { + left = i; + ++i; + } else { + left = j; + ++j; + } + if (tree[i].total_count_ <= tree[j].total_count_) { + right = i; + ++i; + } else { + right = j; + ++j; + } + /* The sentinel node becomes the parent node. */ + node[-1].total_count_ = + tree[left].total_count_ + tree[right].total_count_; + node[-1].index_left_ = (int16_t)left; + node[-1].index_right_or_value_ = (int16_t)right; + /* Add back the last sentinel node. */ + *node++ = sentinel; + } + if (BrotliSetDepth(2 * n - 1, tree, depth, 14)) { + /* We need to pack the Huffman tree in 14 bits. If this was not + successful, add fake entities to the lowest values and retry. */ + break; + } + } + } + BROTLI_FREE(m, tree); + } + BrotliConvertBitDepthsToSymbols(depth, length, bits); + if (count <= 4) { + size_t i; + /* value of 1 indicates a simple Huffman code */ + BrotliWriteBits(2, 1, storage_ix, storage); + BrotliWriteBits(2, count - 1, storage_ix, storage); /* NSYM - 1 */ + + /* Sort */ + for (i = 0; i < count; i++) { + size_t j; + for (j = i + 1; j < count; j++) { + if (depth[symbols[j]] < depth[symbols[i]]) { + BROTLI_SWAP(size_t, symbols, j, i); + } + } + } + + if (count == 2) { + BrotliWriteBits(max_bits, symbols[0], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[1], storage_ix, storage); + } else if (count == 3) { + BrotliWriteBits(max_bits, symbols[0], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[1], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[2], storage_ix, storage); + } else { + BrotliWriteBits(max_bits, symbols[0], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[1], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[2], storage_ix, storage); + BrotliWriteBits(max_bits, symbols[3], storage_ix, storage); + /* tree-select */ + BrotliWriteBits(1, depth[symbols[0]] == 1 ? 1 : 0, storage_ix, storage); + } + } else { + uint8_t previous_value = 8; + size_t i; + /* Complex Huffman Tree */ + StoreStaticCodeLengthCode(storage_ix, storage); + + /* Actual RLE coding. */ + for (i = 0; i < length;) { + const uint8_t value = depth[i]; + size_t reps = 1; + size_t k; + for (k = i + 1; k < length && depth[k] == value; ++k) { + ++reps; + } + i += reps; + if (value == 0) { + BrotliWriteBits(kZeroRepsDepth[reps], kZeroRepsBits[reps], + storage_ix, storage); + } else { + if (previous_value != value) { + BrotliWriteBits(kCodeLengthDepth[value], kCodeLengthBits[value], + storage_ix, storage); + --reps; + } + if (reps < 3) { + while (reps != 0) { + reps--; + BrotliWriteBits(kCodeLengthDepth[value], kCodeLengthBits[value], + storage_ix, storage); + } + } else { + reps -= 3; + BrotliWriteBits(kNonZeroRepsDepth[reps], kNonZeroRepsBits[reps], + storage_ix, storage); + } + previous_value = value; + } + } + } +} + +static size_t IndexOf(const uint8_t* v, size_t v_size, uint8_t value) { + size_t i = 0; + for (; i < v_size; ++i) { + if (v[i] == value) return i; + } + return i; +} + +static void MoveToFront(uint8_t* v, size_t index) { + uint8_t value = v[index]; + size_t i; + for (i = index; i != 0; --i) { + v[i] = v[i - 1]; + } + v[0] = value; +} + +static void MoveToFrontTransform(const uint32_t* BROTLI_RESTRICT v_in, + const size_t v_size, + uint32_t* v_out) { + size_t i; + uint8_t mtf[256]; + uint32_t max_value; + if (v_size == 0) { + return; + } + max_value = v_in[0]; + for (i = 1; i < v_size; ++i) { + if (v_in[i] > max_value) max_value = v_in[i]; + } + BROTLI_DCHECK(max_value < 256u); + for (i = 0; i <= max_value; ++i) { + mtf[i] = (uint8_t)i; + } + { + size_t mtf_size = max_value + 1; + for (i = 0; i < v_size; ++i) { + size_t index = IndexOf(mtf, mtf_size, (uint8_t)v_in[i]); + BROTLI_DCHECK(index < mtf_size); + v_out[i] = (uint32_t)index; + MoveToFront(mtf, index); + } + } +} + +/* Finds runs of zeros in v[0..in_size) and replaces them with a prefix code of + the run length plus extra bits (lower 9 bits is the prefix code and the rest + are the extra bits). Non-zero values in v[] are shifted by + *max_length_prefix. Will not create prefix codes bigger than the initial + value of *max_run_length_prefix. The prefix code of run length L is simply + Log2Floor(L) and the number of extra bits is the same as the prefix code. */ +static void RunLengthCodeZeros(const size_t in_size, + uint32_t* BROTLI_RESTRICT v, size_t* BROTLI_RESTRICT out_size, + uint32_t* BROTLI_RESTRICT max_run_length_prefix) { + uint32_t max_reps = 0; + size_t i; + uint32_t max_prefix; + for (i = 0; i < in_size;) { + uint32_t reps = 0; + for (; i < in_size && v[i] != 0; ++i) ; + for (; i < in_size && v[i] == 0; ++i) { + ++reps; + } + max_reps = BROTLI_MAX(uint32_t, reps, max_reps); + } + max_prefix = max_reps > 0 ? Log2FloorNonZero(max_reps) : 0; + max_prefix = BROTLI_MIN(uint32_t, max_prefix, *max_run_length_prefix); + *max_run_length_prefix = max_prefix; + *out_size = 0; + for (i = 0; i < in_size;) { + BROTLI_DCHECK(*out_size <= i); + if (v[i] != 0) { + v[*out_size] = v[i] + *max_run_length_prefix; + ++i; + ++(*out_size); + } else { + uint32_t reps = 1; + size_t k; + for (k = i + 1; k < in_size && v[k] == 0; ++k) { + ++reps; + } + i += reps; + while (reps != 0) { + if (reps < (2u << max_prefix)) { + uint32_t run_length_prefix = Log2FloorNonZero(reps); + const uint32_t extra_bits = reps - (1u << run_length_prefix); + v[*out_size] = run_length_prefix + (extra_bits << 9); + ++(*out_size); + break; + } else { + const uint32_t extra_bits = (1u << max_prefix) - 1u; + v[*out_size] = max_prefix + (extra_bits << 9); + reps -= (2u << max_prefix) - 1u; + ++(*out_size); + } + } + } + } +} + +#define SYMBOL_BITS 9 + +static void EncodeContextMap(MemoryManager* m, + const uint32_t* context_map, + size_t context_map_size, + size_t num_clusters, + HuffmanTree* tree, + size_t* storage_ix, uint8_t* storage) { + size_t i; + uint32_t* rle_symbols; + uint32_t max_run_length_prefix = 6; + size_t num_rle_symbols = 0; + uint32_t histogram[BROTLI_MAX_CONTEXT_MAP_SYMBOLS]; + static const uint32_t kSymbolMask = (1u << SYMBOL_BITS) - 1u; + uint8_t depths[BROTLI_MAX_CONTEXT_MAP_SYMBOLS]; + uint16_t bits[BROTLI_MAX_CONTEXT_MAP_SYMBOLS]; + + StoreVarLenUint8(num_clusters - 1, storage_ix, storage); + + if (num_clusters == 1) { + return; + } + + rle_symbols = BROTLI_ALLOC(m, uint32_t, context_map_size); + if (BROTLI_IS_OOM(m)) return; + MoveToFrontTransform(context_map, context_map_size, rle_symbols); + RunLengthCodeZeros(context_map_size, rle_symbols, + &num_rle_symbols, &max_run_length_prefix); + memset(histogram, 0, sizeof(histogram)); + for (i = 0; i < num_rle_symbols; ++i) { + ++histogram[rle_symbols[i] & kSymbolMask]; + } + { + BROTLI_BOOL use_rle = TO_BROTLI_BOOL(max_run_length_prefix > 0); + BrotliWriteBits(1, (uint64_t)use_rle, storage_ix, storage); + if (use_rle) { + BrotliWriteBits(4, max_run_length_prefix - 1, storage_ix, storage); + } + } + BuildAndStoreHuffmanTree(histogram, num_clusters + max_run_length_prefix, + num_clusters + max_run_length_prefix, + tree, depths, bits, storage_ix, storage); + for (i = 0; i < num_rle_symbols; ++i) { + const uint32_t rle_symbol = rle_symbols[i] & kSymbolMask; + const uint32_t extra_bits_val = rle_symbols[i] >> SYMBOL_BITS; + BrotliWriteBits(depths[rle_symbol], bits[rle_symbol], storage_ix, storage); + if (rle_symbol > 0 && rle_symbol <= max_run_length_prefix) { + BrotliWriteBits(rle_symbol, extra_bits_val, storage_ix, storage); + } + } + BrotliWriteBits(1, 1, storage_ix, storage); /* use move-to-front */ + BROTLI_FREE(m, rle_symbols); +} + +/* Stores the block switch command with index block_ix to the bit stream. */ +static BROTLI_INLINE void StoreBlockSwitch(BlockSplitCode* code, + const uint32_t block_len, + const uint8_t block_type, + BROTLI_BOOL is_first_block, + size_t* storage_ix, + uint8_t* storage) { + size_t typecode = NextBlockTypeCode(&code->type_code_calculator, block_type); + size_t lencode; + uint32_t len_nextra; + uint32_t len_extra; + if (!is_first_block) { + BrotliWriteBits(code->type_depths[typecode], code->type_bits[typecode], + storage_ix, storage); + } + GetBlockLengthPrefixCode(block_len, &lencode, &len_nextra, &len_extra); + + BrotliWriteBits(code->length_depths[lencode], code->length_bits[lencode], + storage_ix, storage); + BrotliWriteBits(len_nextra, len_extra, storage_ix, storage); +} + +/* Builds a BlockSplitCode data structure from the block split given by the + vector of block types and block lengths and stores it to the bit stream. */ +static void BuildAndStoreBlockSplitCode(const uint8_t* types, + const uint32_t* lengths, + const size_t num_blocks, + const size_t num_types, + HuffmanTree* tree, + BlockSplitCode* code, + size_t* storage_ix, + uint8_t* storage) { + uint32_t type_histo[BROTLI_MAX_BLOCK_TYPE_SYMBOLS]; + uint32_t length_histo[BROTLI_NUM_BLOCK_LEN_SYMBOLS]; + size_t i; + BlockTypeCodeCalculator type_code_calculator; + memset(type_histo, 0, (num_types + 2) * sizeof(type_histo[0])); + memset(length_histo, 0, sizeof(length_histo)); + InitBlockTypeCodeCalculator(&type_code_calculator); + for (i = 0; i < num_blocks; ++i) { + size_t type_code = NextBlockTypeCode(&type_code_calculator, types[i]); + if (i != 0) ++type_histo[type_code]; + ++length_histo[BlockLengthPrefixCode(lengths[i])]; + } + StoreVarLenUint8(num_types - 1, storage_ix, storage); + if (num_types > 1) { /* TODO: else? could StoreBlockSwitch occur? */ + BuildAndStoreHuffmanTree(&type_histo[0], num_types + 2, num_types + 2, tree, + &code->type_depths[0], &code->type_bits[0], + storage_ix, storage); + BuildAndStoreHuffmanTree(&length_histo[0], BROTLI_NUM_BLOCK_LEN_SYMBOLS, + BROTLI_NUM_BLOCK_LEN_SYMBOLS, + tree, &code->length_depths[0], + &code->length_bits[0], storage_ix, storage); + StoreBlockSwitch(code, lengths[0], types[0], 1, storage_ix, storage); + } +} + +/* Stores a context map where the histogram type is always the block type. */ +static void StoreTrivialContextMap(size_t num_types, + size_t context_bits, + HuffmanTree* tree, + size_t* storage_ix, + uint8_t* storage) { + StoreVarLenUint8(num_types - 1, storage_ix, storage); + if (num_types > 1) { + size_t repeat_code = context_bits - 1u; + size_t repeat_bits = (1u << repeat_code) - 1u; + size_t alphabet_size = num_types + repeat_code; + uint32_t histogram[BROTLI_MAX_CONTEXT_MAP_SYMBOLS]; + uint8_t depths[BROTLI_MAX_CONTEXT_MAP_SYMBOLS]; + uint16_t bits[BROTLI_MAX_CONTEXT_MAP_SYMBOLS]; + size_t i; + memset(histogram, 0, alphabet_size * sizeof(histogram[0])); + /* Write RLEMAX. */ + BrotliWriteBits(1, 1, storage_ix, storage); + BrotliWriteBits(4, repeat_code - 1, storage_ix, storage); + histogram[repeat_code] = (uint32_t)num_types; + histogram[0] = 1; + for (i = context_bits; i < alphabet_size; ++i) { + histogram[i] = 1; + } + BuildAndStoreHuffmanTree(histogram, alphabet_size, alphabet_size, + tree, depths, bits, storage_ix, storage); + for (i = 0; i < num_types; ++i) { + size_t code = (i == 0 ? 0 : i + context_bits - 1); + BrotliWriteBits(depths[code], bits[code], storage_ix, storage); + BrotliWriteBits( + depths[repeat_code], bits[repeat_code], storage_ix, storage); + BrotliWriteBits(repeat_code, repeat_bits, storage_ix, storage); + } + /* Write IMTF (inverse-move-to-front) bit. */ + BrotliWriteBits(1, 1, storage_ix, storage); + } +} + +/* Manages the encoding of one block category (literal, command or distance). */ +typedef struct BlockEncoder { + size_t histogram_length_; + size_t num_block_types_; + const uint8_t* block_types_; /* Not owned. */ + const uint32_t* block_lengths_; /* Not owned. */ + size_t num_blocks_; + BlockSplitCode block_split_code_; + size_t block_ix_; + size_t block_len_; + size_t entropy_ix_; + uint8_t* depths_; + uint16_t* bits_; +} BlockEncoder; + +static void InitBlockEncoder(BlockEncoder* self, size_t histogram_length, + size_t num_block_types, const uint8_t* block_types, + const uint32_t* block_lengths, const size_t num_blocks) { + self->histogram_length_ = histogram_length; + self->num_block_types_ = num_block_types; + self->block_types_ = block_types; + self->block_lengths_ = block_lengths; + self->num_blocks_ = num_blocks; + InitBlockTypeCodeCalculator(&self->block_split_code_.type_code_calculator); + self->block_ix_ = 0; + self->block_len_ = num_blocks == 0 ? 0 : block_lengths[0]; + self->entropy_ix_ = 0; + self->depths_ = 0; + self->bits_ = 0; +} + +static void CleanupBlockEncoder(MemoryManager* m, BlockEncoder* self) { + BROTLI_FREE(m, self->depths_); + BROTLI_FREE(m, self->bits_); +} + +/* Creates entropy codes of block lengths and block types and stores them + to the bit stream. */ +static void BuildAndStoreBlockSwitchEntropyCodes(BlockEncoder* self, + HuffmanTree* tree, size_t* storage_ix, uint8_t* storage) { + BuildAndStoreBlockSplitCode(self->block_types_, self->block_lengths_, + self->num_blocks_, self->num_block_types_, tree, &self->block_split_code_, + storage_ix, storage); +} + +/* Stores the next symbol with the entropy code of the current block type. + Updates the block type and block length at block boundaries. */ +static void StoreSymbol(BlockEncoder* self, size_t symbol, size_t* storage_ix, + uint8_t* storage) { + if (self->block_len_ == 0) { + size_t block_ix = ++self->block_ix_; + uint32_t block_len = self->block_lengths_[block_ix]; + uint8_t block_type = self->block_types_[block_ix]; + self->block_len_ = block_len; + self->entropy_ix_ = block_type * self->histogram_length_; + StoreBlockSwitch(&self->block_split_code_, block_len, block_type, 0, + storage_ix, storage); + } + --self->block_len_; + { + size_t ix = self->entropy_ix_ + symbol; + BrotliWriteBits(self->depths_[ix], self->bits_[ix], storage_ix, storage); + } +} + +/* Stores the next symbol with the entropy code of the current block type and + context value. + Updates the block type and block length at block boundaries. */ +static void StoreSymbolWithContext(BlockEncoder* self, size_t symbol, + size_t context, const uint32_t* context_map, size_t* storage_ix, + uint8_t* storage, const size_t context_bits) { + if (self->block_len_ == 0) { + size_t block_ix = ++self->block_ix_; + uint32_t block_len = self->block_lengths_[block_ix]; + uint8_t block_type = self->block_types_[block_ix]; + self->block_len_ = block_len; + self->entropy_ix_ = (size_t)block_type << context_bits; + StoreBlockSwitch(&self->block_split_code_, block_len, block_type, 0, + storage_ix, storage); + } + --self->block_len_; + { + size_t histo_ix = context_map[self->entropy_ix_ + context]; + size_t ix = histo_ix * self->histogram_length_ + symbol; + BrotliWriteBits(self->depths_[ix], self->bits_[ix], storage_ix, storage); + } +} + +#define FN(X) X ## Literal +/* NOLINTNEXTLINE(build/include) */ +#include "./block_encoder_inc.h" +#undef FN + +#define FN(X) X ## Command +/* NOLINTNEXTLINE(build/include) */ +#include "./block_encoder_inc.h" +#undef FN + +#define FN(X) X ## Distance +/* NOLINTNEXTLINE(build/include) */ +#include "./block_encoder_inc.h" +#undef FN + +static void JumpToByteBoundary(size_t* storage_ix, uint8_t* storage) { + *storage_ix = (*storage_ix + 7u) & ~7u; + storage[*storage_ix >> 3] = 0; +} + +void BrotliStoreMetaBlock(MemoryManager* m, + const uint8_t* input, size_t start_pos, size_t length, size_t mask, + uint8_t prev_byte, uint8_t prev_byte2, BROTLI_BOOL is_last, + const BrotliEncoderParams* params, ContextType literal_context_mode, + const Command* commands, size_t n_commands, const MetaBlockSplit* mb, + size_t* storage_ix, uint8_t* storage) { + + size_t pos = start_pos; + size_t i; + uint32_t num_distance_symbols = params->dist.alphabet_size; + uint32_t num_effective_distance_symbols = num_distance_symbols; + HuffmanTree* tree; + ContextLut literal_context_lut = BROTLI_CONTEXT_LUT(literal_context_mode); + BlockEncoder literal_enc; + BlockEncoder command_enc; + BlockEncoder distance_enc; + const BrotliDistanceParams* dist = ¶ms->dist; + if (params->large_window && + num_effective_distance_symbols > BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS) { + num_effective_distance_symbols = BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS; + } + + StoreCompressedMetaBlockHeader(is_last, length, storage_ix, storage); + + tree = BROTLI_ALLOC(m, HuffmanTree, MAX_HUFFMAN_TREE_SIZE); + if (BROTLI_IS_OOM(m)) return; + InitBlockEncoder(&literal_enc, BROTLI_NUM_LITERAL_SYMBOLS, + mb->literal_split.num_types, mb->literal_split.types, + mb->literal_split.lengths, mb->literal_split.num_blocks); + InitBlockEncoder(&command_enc, BROTLI_NUM_COMMAND_SYMBOLS, + mb->command_split.num_types, mb->command_split.types, + mb->command_split.lengths, mb->command_split.num_blocks); + InitBlockEncoder(&distance_enc, num_effective_distance_symbols, + mb->distance_split.num_types, mb->distance_split.types, + mb->distance_split.lengths, mb->distance_split.num_blocks); + + BuildAndStoreBlockSwitchEntropyCodes(&literal_enc, tree, storage_ix, storage); + BuildAndStoreBlockSwitchEntropyCodes(&command_enc, tree, storage_ix, storage); + BuildAndStoreBlockSwitchEntropyCodes( + &distance_enc, tree, storage_ix, storage); + + BrotliWriteBits(2, dist->distance_postfix_bits, storage_ix, storage); + BrotliWriteBits( + 4, dist->num_direct_distance_codes >> dist->distance_postfix_bits, + storage_ix, storage); + for (i = 0; i < mb->literal_split.num_types; ++i) { + BrotliWriteBits(2, literal_context_mode, storage_ix, storage); + } + + if (mb->literal_context_map_size == 0) { + StoreTrivialContextMap(mb->literal_histograms_size, + BROTLI_LITERAL_CONTEXT_BITS, tree, storage_ix, storage); + } else { + EncodeContextMap(m, + mb->literal_context_map, mb->literal_context_map_size, + mb->literal_histograms_size, tree, storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + } + + if (mb->distance_context_map_size == 0) { + StoreTrivialContextMap(mb->distance_histograms_size, + BROTLI_DISTANCE_CONTEXT_BITS, tree, storage_ix, storage); + } else { + EncodeContextMap(m, + mb->distance_context_map, mb->distance_context_map_size, + mb->distance_histograms_size, tree, storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + } + + BuildAndStoreEntropyCodesLiteral(m, &literal_enc, mb->literal_histograms, + mb->literal_histograms_size, BROTLI_NUM_LITERAL_SYMBOLS, tree, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + BuildAndStoreEntropyCodesCommand(m, &command_enc, mb->command_histograms, + mb->command_histograms_size, BROTLI_NUM_COMMAND_SYMBOLS, tree, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + BuildAndStoreEntropyCodesDistance(m, &distance_enc, mb->distance_histograms, + mb->distance_histograms_size, num_distance_symbols, tree, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + BROTLI_FREE(m, tree); + + for (i = 0; i < n_commands; ++i) { + const Command cmd = commands[i]; + size_t cmd_code = cmd.cmd_prefix_; + StoreSymbol(&command_enc, cmd_code, storage_ix, storage); + StoreCommandExtra(&cmd, storage_ix, storage); + if (mb->literal_context_map_size == 0) { + size_t j; + for (j = cmd.insert_len_; j != 0; --j) { + StoreSymbol(&literal_enc, input[pos & mask], storage_ix, storage); + ++pos; + } + } else { + size_t j; + for (j = cmd.insert_len_; j != 0; --j) { + size_t context = + BROTLI_CONTEXT(prev_byte, prev_byte2, literal_context_lut); + uint8_t literal = input[pos & mask]; + StoreSymbolWithContext(&literal_enc, literal, context, + mb->literal_context_map, storage_ix, storage, + BROTLI_LITERAL_CONTEXT_BITS); + prev_byte2 = prev_byte; + prev_byte = literal; + ++pos; + } + } + pos += CommandCopyLen(&cmd); + if (CommandCopyLen(&cmd)) { + prev_byte2 = input[(pos - 2) & mask]; + prev_byte = input[(pos - 1) & mask]; + if (cmd.cmd_prefix_ >= 128) { + size_t dist_code = cmd.dist_prefix_ & 0x3FF; + uint32_t distnumextra = cmd.dist_prefix_ >> 10; + uint64_t distextra = cmd.dist_extra_; + if (mb->distance_context_map_size == 0) { + StoreSymbol(&distance_enc, dist_code, storage_ix, storage); + } else { + size_t context = CommandDistanceContext(&cmd); + StoreSymbolWithContext(&distance_enc, dist_code, context, + mb->distance_context_map, storage_ix, storage, + BROTLI_DISTANCE_CONTEXT_BITS); + } + BrotliWriteBits(distnumextra, distextra, storage_ix, storage); + } + } + } + CleanupBlockEncoder(m, &distance_enc); + CleanupBlockEncoder(m, &command_enc); + CleanupBlockEncoder(m, &literal_enc); + if (is_last) { + JumpToByteBoundary(storage_ix, storage); + } +} + +static void BuildHistograms(const uint8_t* input, + size_t start_pos, + size_t mask, + const Command* commands, + size_t n_commands, + HistogramLiteral* lit_histo, + HistogramCommand* cmd_histo, + HistogramDistance* dist_histo) { + size_t pos = start_pos; + size_t i; + for (i = 0; i < n_commands; ++i) { + const Command cmd = commands[i]; + size_t j; + HistogramAddCommand(cmd_histo, cmd.cmd_prefix_); + for (j = cmd.insert_len_; j != 0; --j) { + HistogramAddLiteral(lit_histo, input[pos & mask]); + ++pos; + } + pos += CommandCopyLen(&cmd); + if (CommandCopyLen(&cmd) && cmd.cmd_prefix_ >= 128) { + HistogramAddDistance(dist_histo, cmd.dist_prefix_ & 0x3FF); + } + } +} + +static void StoreDataWithHuffmanCodes(const uint8_t* input, + size_t start_pos, + size_t mask, + const Command* commands, + size_t n_commands, + const uint8_t* lit_depth, + const uint16_t* lit_bits, + const uint8_t* cmd_depth, + const uint16_t* cmd_bits, + const uint8_t* dist_depth, + const uint16_t* dist_bits, + size_t* storage_ix, + uint8_t* storage) { + size_t pos = start_pos; + size_t i; + for (i = 0; i < n_commands; ++i) { + const Command cmd = commands[i]; + const size_t cmd_code = cmd.cmd_prefix_; + size_t j; + BrotliWriteBits( + cmd_depth[cmd_code], cmd_bits[cmd_code], storage_ix, storage); + StoreCommandExtra(&cmd, storage_ix, storage); + for (j = cmd.insert_len_; j != 0; --j) { + const uint8_t literal = input[pos & mask]; + BrotliWriteBits( + lit_depth[literal], lit_bits[literal], storage_ix, storage); + ++pos; + } + pos += CommandCopyLen(&cmd); + if (CommandCopyLen(&cmd) && cmd.cmd_prefix_ >= 128) { + const size_t dist_code = cmd.dist_prefix_ & 0x3FF; + const uint32_t distnumextra = cmd.dist_prefix_ >> 10; + const uint32_t distextra = cmd.dist_extra_; + BrotliWriteBits(dist_depth[dist_code], dist_bits[dist_code], + storage_ix, storage); + BrotliWriteBits(distnumextra, distextra, storage_ix, storage); + } + } +} + +void BrotliStoreMetaBlockTrivial(MemoryManager* m, + const uint8_t* input, size_t start_pos, size_t length, size_t mask, + BROTLI_BOOL is_last, const BrotliEncoderParams* params, + const Command* commands, size_t n_commands, + size_t* storage_ix, uint8_t* storage) { + HistogramLiteral lit_histo; + HistogramCommand cmd_histo; + HistogramDistance dist_histo; + uint8_t lit_depth[BROTLI_NUM_LITERAL_SYMBOLS]; + uint16_t lit_bits[BROTLI_NUM_LITERAL_SYMBOLS]; + uint8_t cmd_depth[BROTLI_NUM_COMMAND_SYMBOLS]; + uint16_t cmd_bits[BROTLI_NUM_COMMAND_SYMBOLS]; + uint8_t dist_depth[MAX_SIMPLE_DISTANCE_ALPHABET_SIZE]; + uint16_t dist_bits[MAX_SIMPLE_DISTANCE_ALPHABET_SIZE]; + HuffmanTree* tree; + uint32_t num_distance_symbols = params->dist.alphabet_size; + + StoreCompressedMetaBlockHeader(is_last, length, storage_ix, storage); + + HistogramClearLiteral(&lit_histo); + HistogramClearCommand(&cmd_histo); + HistogramClearDistance(&dist_histo); + + BuildHistograms(input, start_pos, mask, commands, n_commands, + &lit_histo, &cmd_histo, &dist_histo); + + BrotliWriteBits(13, 0, storage_ix, storage); + + tree = BROTLI_ALLOC(m, HuffmanTree, MAX_HUFFMAN_TREE_SIZE); + if (BROTLI_IS_OOM(m)) return; + BuildAndStoreHuffmanTree(lit_histo.data_, BROTLI_NUM_LITERAL_SYMBOLS, + BROTLI_NUM_LITERAL_SYMBOLS, tree, + lit_depth, lit_bits, + storage_ix, storage); + BuildAndStoreHuffmanTree(cmd_histo.data_, BROTLI_NUM_COMMAND_SYMBOLS, + BROTLI_NUM_COMMAND_SYMBOLS, tree, + cmd_depth, cmd_bits, + storage_ix, storage); + BuildAndStoreHuffmanTree(dist_histo.data_, MAX_SIMPLE_DISTANCE_ALPHABET_SIZE, + num_distance_symbols, tree, + dist_depth, dist_bits, + storage_ix, storage); + BROTLI_FREE(m, tree); + StoreDataWithHuffmanCodes(input, start_pos, mask, commands, + n_commands, lit_depth, lit_bits, + cmd_depth, cmd_bits, + dist_depth, dist_bits, + storage_ix, storage); + if (is_last) { + JumpToByteBoundary(storage_ix, storage); + } +} + +void BrotliStoreMetaBlockFast(MemoryManager* m, + const uint8_t* input, size_t start_pos, size_t length, size_t mask, + BROTLI_BOOL is_last, const BrotliEncoderParams* params, + const Command* commands, size_t n_commands, + size_t* storage_ix, uint8_t* storage) { + uint32_t num_distance_symbols = params->dist.alphabet_size; + uint32_t distance_alphabet_bits = + Log2FloorNonZero(num_distance_symbols - 1) + 1; + + StoreCompressedMetaBlockHeader(is_last, length, storage_ix, storage); + + BrotliWriteBits(13, 0, storage_ix, storage); + + if (n_commands <= 128) { + uint32_t histogram[BROTLI_NUM_LITERAL_SYMBOLS] = { 0 }; + size_t pos = start_pos; + size_t num_literals = 0; + size_t i; + uint8_t lit_depth[BROTLI_NUM_LITERAL_SYMBOLS]; + uint16_t lit_bits[BROTLI_NUM_LITERAL_SYMBOLS]; + for (i = 0; i < n_commands; ++i) { + const Command cmd = commands[i]; + size_t j; + for (j = cmd.insert_len_; j != 0; --j) { + ++histogram[input[pos & mask]]; + ++pos; + } + num_literals += cmd.insert_len_; + pos += CommandCopyLen(&cmd); + } + BrotliBuildAndStoreHuffmanTreeFast(m, histogram, num_literals, + /* max_bits = */ 8, + lit_depth, lit_bits, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + StoreStaticCommandHuffmanTree(storage_ix, storage); + StoreStaticDistanceHuffmanTree(storage_ix, storage); + StoreDataWithHuffmanCodes(input, start_pos, mask, commands, + n_commands, lit_depth, lit_bits, + kStaticCommandCodeDepth, + kStaticCommandCodeBits, + kStaticDistanceCodeDepth, + kStaticDistanceCodeBits, + storage_ix, storage); + } else { + HistogramLiteral lit_histo; + HistogramCommand cmd_histo; + HistogramDistance dist_histo; + uint8_t lit_depth[BROTLI_NUM_LITERAL_SYMBOLS]; + uint16_t lit_bits[BROTLI_NUM_LITERAL_SYMBOLS]; + uint8_t cmd_depth[BROTLI_NUM_COMMAND_SYMBOLS]; + uint16_t cmd_bits[BROTLI_NUM_COMMAND_SYMBOLS]; + uint8_t dist_depth[MAX_SIMPLE_DISTANCE_ALPHABET_SIZE]; + uint16_t dist_bits[MAX_SIMPLE_DISTANCE_ALPHABET_SIZE]; + HistogramClearLiteral(&lit_histo); + HistogramClearCommand(&cmd_histo); + HistogramClearDistance(&dist_histo); + BuildHistograms(input, start_pos, mask, commands, n_commands, + &lit_histo, &cmd_histo, &dist_histo); + BrotliBuildAndStoreHuffmanTreeFast(m, lit_histo.data_, + lit_histo.total_count_, + /* max_bits = */ 8, + lit_depth, lit_bits, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + BrotliBuildAndStoreHuffmanTreeFast(m, cmd_histo.data_, + cmd_histo.total_count_, + /* max_bits = */ 10, + cmd_depth, cmd_bits, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + BrotliBuildAndStoreHuffmanTreeFast(m, dist_histo.data_, + dist_histo.total_count_, + /* max_bits = */ + distance_alphabet_bits, + dist_depth, dist_bits, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + StoreDataWithHuffmanCodes(input, start_pos, mask, commands, + n_commands, lit_depth, lit_bits, + cmd_depth, cmd_bits, + dist_depth, dist_bits, + storage_ix, storage); + } + + if (is_last) { + JumpToByteBoundary(storage_ix, storage); + } +} + +/* This is for storing uncompressed blocks (simple raw storage of + bytes-as-bytes). */ +void BrotliStoreUncompressedMetaBlock(BROTLI_BOOL is_final_block, + const uint8_t* BROTLI_RESTRICT input, + size_t position, size_t mask, + size_t len, + size_t* BROTLI_RESTRICT storage_ix, + uint8_t* BROTLI_RESTRICT storage) { + size_t masked_pos = position & mask; + BrotliStoreUncompressedMetaBlockHeader(len, storage_ix, storage); + JumpToByteBoundary(storage_ix, storage); + + if (masked_pos + len > mask + 1) { + size_t len1 = mask + 1 - masked_pos; + memcpy(&storage[*storage_ix >> 3], &input[masked_pos], len1); + *storage_ix += len1 << 3; + len -= len1; + masked_pos = 0; + } + memcpy(&storage[*storage_ix >> 3], &input[masked_pos], len); + *storage_ix += len << 3; + + /* We need to clear the next 4 bytes to continue to be + compatible with BrotliWriteBits. */ + BrotliWriteBitsPrepareStorage(*storage_ix, storage); + + /* Since the uncompressed block itself may not be the final block, add an + empty one after this. */ + if (is_final_block) { + BrotliWriteBits(1, 1, storage_ix, storage); /* islast */ + BrotliWriteBits(1, 1, storage_ix, storage); /* isempty */ + JumpToByteBoundary(storage_ix, storage); + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/brotli_bit_stream.h b/modules/brotli/enc/brotli_bit_stream.h new file mode 100644 index 000000000..2ed703bf7 --- /dev/null +++ b/modules/brotli/enc/brotli_bit_stream.h @@ -0,0 +1,84 @@ +/* Copyright 2014 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Functions to convert brotli-related data structures into the + brotli bit stream. The functions here operate under + assumption that there is enough space in the storage, i.e., there are + no out-of-range checks anywhere. + + These functions do bit addressing into a byte array. The byte array + is called "storage" and the index to the bit is called storage_ix + in function arguments. */ + +#ifndef BROTLI_ENC_BROTLI_BIT_STREAM_H_ +#define BROTLI_ENC_BROTLI_BIT_STREAM_H_ + +#include "../common/context.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./command.h" +#include "./entropy_encode.h" +#include "./memory.h" +#include "./metablock.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* All Store functions here will use a storage_ix, which is always the bit + position for the current storage. */ + +BROTLI_INTERNAL void BrotliStoreHuffmanTree(const uint8_t* depths, size_t num, + HuffmanTree* tree, size_t* storage_ix, uint8_t* storage); + +BROTLI_INTERNAL void BrotliBuildAndStoreHuffmanTreeFast( + MemoryManager* m, const uint32_t* histogram, const size_t histogram_total, + const size_t max_bits, uint8_t* depth, uint16_t* bits, size_t* storage_ix, + uint8_t* storage); + +/* REQUIRES: length > 0 */ +/* REQUIRES: length <= (1 << 24) */ +BROTLI_INTERNAL void BrotliStoreMetaBlock(MemoryManager* m, + const uint8_t* input, size_t start_pos, size_t length, size_t mask, + uint8_t prev_byte, uint8_t prev_byte2, BROTLI_BOOL is_last, + const BrotliEncoderParams* params, ContextType literal_context_mode, + const Command* commands, size_t n_commands, const MetaBlockSplit* mb, + size_t* storage_ix, uint8_t* storage); + +/* Stores the meta-block without doing any block splitting, just collects + one histogram per block category and uses that for entropy coding. + REQUIRES: length > 0 + REQUIRES: length <= (1 << 24) */ +BROTLI_INTERNAL void BrotliStoreMetaBlockTrivial(MemoryManager* m, + const uint8_t* input, size_t start_pos, size_t length, size_t mask, + BROTLI_BOOL is_last, const BrotliEncoderParams* params, + const Command* commands, size_t n_commands, + size_t* storage_ix, uint8_t* storage); + +/* Same as above, but uses static prefix codes for histograms with a only a few + symbols, and uses static code length prefix codes for all other histograms. + REQUIRES: length > 0 + REQUIRES: length <= (1 << 24) */ +BROTLI_INTERNAL void BrotliStoreMetaBlockFast(MemoryManager* m, + const uint8_t* input, size_t start_pos, size_t length, size_t mask, + BROTLI_BOOL is_last, const BrotliEncoderParams* params, + const Command* commands, size_t n_commands, + size_t* storage_ix, uint8_t* storage); + +/* This is for storing uncompressed blocks (simple raw storage of + bytes-as-bytes). + REQUIRES: length > 0 + REQUIRES: length <= (1 << 24) */ +BROTLI_INTERNAL void BrotliStoreUncompressedMetaBlock( + BROTLI_BOOL is_final_block, const uint8_t* BROTLI_RESTRICT input, + size_t position, size_t mask, size_t len, + size_t* BROTLI_RESTRICT storage_ix, uint8_t* BROTLI_RESTRICT storage); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_BROTLI_BIT_STREAM_H_ */ diff --git a/modules/brotli/enc/cluster.c b/modules/brotli/enc/cluster.c new file mode 100644 index 000000000..a20dfd385 --- /dev/null +++ b/modules/brotli/enc/cluster.c @@ -0,0 +1,56 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Functions for clustering similar histograms together. */ + +#include "./cluster.h" + +#include "../common/platform.h" +#include <brotli/types.h> +#include "./bit_cost.h" /* BrotliPopulationCost */ +#include "./fast_log.h" +#include "./histogram.h" +#include "./memory.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static BROTLI_INLINE BROTLI_BOOL HistogramPairIsLess( + const HistogramPair* p1, const HistogramPair* p2) { + if (p1->cost_diff != p2->cost_diff) { + return TO_BROTLI_BOOL(p1->cost_diff > p2->cost_diff); + } + return TO_BROTLI_BOOL((p1->idx2 - p1->idx1) > (p2->idx2 - p2->idx1)); +} + +/* Returns entropy reduction of the context map when we combine two clusters. */ +static BROTLI_INLINE double ClusterCostDiff(size_t size_a, size_t size_b) { + size_t size_c = size_a + size_b; + return (double)size_a * FastLog2(size_a) + + (double)size_b * FastLog2(size_b) - + (double)size_c * FastLog2(size_c); +} + +#define CODE(X) X + +#define FN(X) X ## Literal +#include "./cluster_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define FN(X) X ## Command +#include "./cluster_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define FN(X) X ## Distance +#include "./cluster_inc.h" /* NOLINT(build/include) */ +#undef FN + +#undef CODE + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/cluster.h b/modules/brotli/enc/cluster.h new file mode 100644 index 000000000..bb26124d2 --- /dev/null +++ b/modules/brotli/enc/cluster.h @@ -0,0 +1,48 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Functions for clustering similar histograms together. */ + +#ifndef BROTLI_ENC_CLUSTER_H_ +#define BROTLI_ENC_CLUSTER_H_ + +#include "../common/platform.h" +#include <brotli/types.h> +#include "./histogram.h" +#include "./memory.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +typedef struct HistogramPair { + uint32_t idx1; + uint32_t idx2; + double cost_combo; + double cost_diff; +} HistogramPair; + +#define CODE(X) /* Declaration */; + +#define FN(X) X ## Literal +#include "./cluster_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define FN(X) X ## Command +#include "./cluster_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define FN(X) X ## Distance +#include "./cluster_inc.h" /* NOLINT(build/include) */ +#undef FN + +#undef CODE + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_CLUSTER_H_ */ diff --git a/modules/brotli/enc/cluster_inc.h b/modules/brotli/enc/cluster_inc.h new file mode 100644 index 000000000..22ecb3cca --- /dev/null +++ b/modules/brotli/enc/cluster_inc.h @@ -0,0 +1,317 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN, CODE */ + +#define HistogramType FN(Histogram) + +/* Computes the bit cost reduction by combining out[idx1] and out[idx2] and if + it is below a threshold, stores the pair (idx1, idx2) in the *pairs queue. */ +BROTLI_INTERNAL void FN(BrotliCompareAndPushToQueue)( + const HistogramType* out, const uint32_t* cluster_size, uint32_t idx1, + uint32_t idx2, size_t max_num_pairs, HistogramPair* pairs, + size_t* num_pairs) CODE({ + BROTLI_BOOL is_good_pair = BROTLI_FALSE; + HistogramPair p; + p.idx1 = p.idx2 = 0; + p.cost_diff = p.cost_combo = 0; + if (idx1 == idx2) { + return; + } + if (idx2 < idx1) { + uint32_t t = idx2; + idx2 = idx1; + idx1 = t; + } + p.idx1 = idx1; + p.idx2 = idx2; + p.cost_diff = 0.5 * ClusterCostDiff(cluster_size[idx1], cluster_size[idx2]); + p.cost_diff -= out[idx1].bit_cost_; + p.cost_diff -= out[idx2].bit_cost_; + + if (out[idx1].total_count_ == 0) { + p.cost_combo = out[idx2].bit_cost_; + is_good_pair = BROTLI_TRUE; + } else if (out[idx2].total_count_ == 0) { + p.cost_combo = out[idx1].bit_cost_; + is_good_pair = BROTLI_TRUE; + } else { + double threshold = *num_pairs == 0 ? 1e99 : + BROTLI_MAX(double, 0.0, pairs[0].cost_diff); + HistogramType combo = out[idx1]; + double cost_combo; + FN(HistogramAddHistogram)(&combo, &out[idx2]); + cost_combo = FN(BrotliPopulationCost)(&combo); + if (cost_combo < threshold - p.cost_diff) { + p.cost_combo = cost_combo; + is_good_pair = BROTLI_TRUE; + } + } + if (is_good_pair) { + p.cost_diff += p.cost_combo; + if (*num_pairs > 0 && HistogramPairIsLess(&pairs[0], &p)) { + /* Replace the top of the queue if needed. */ + if (*num_pairs < max_num_pairs) { + pairs[*num_pairs] = pairs[0]; + ++(*num_pairs); + } + pairs[0] = p; + } else if (*num_pairs < max_num_pairs) { + pairs[*num_pairs] = p; + ++(*num_pairs); + } + } +}) + +BROTLI_INTERNAL size_t FN(BrotliHistogramCombine)(HistogramType* out, + uint32_t* cluster_size, + uint32_t* symbols, + uint32_t* clusters, + HistogramPair* pairs, + size_t num_clusters, + size_t symbols_size, + size_t max_clusters, + size_t max_num_pairs) CODE({ + double cost_diff_threshold = 0.0; + size_t min_cluster_size = 1; + size_t num_pairs = 0; + + { + /* We maintain a vector of histogram pairs, with the property that the pair + with the maximum bit cost reduction is the first. */ + size_t idx1; + for (idx1 = 0; idx1 < num_clusters; ++idx1) { + size_t idx2; + for (idx2 = idx1 + 1; idx2 < num_clusters; ++idx2) { + FN(BrotliCompareAndPushToQueue)(out, cluster_size, clusters[idx1], + clusters[idx2], max_num_pairs, &pairs[0], &num_pairs); + } + } + } + + while (num_clusters > min_cluster_size) { + uint32_t best_idx1; + uint32_t best_idx2; + size_t i; + if (pairs[0].cost_diff >= cost_diff_threshold) { + cost_diff_threshold = 1e99; + min_cluster_size = max_clusters; + continue; + } + /* Take the best pair from the top of heap. */ + best_idx1 = pairs[0].idx1; + best_idx2 = pairs[0].idx2; + FN(HistogramAddHistogram)(&out[best_idx1], &out[best_idx2]); + out[best_idx1].bit_cost_ = pairs[0].cost_combo; + cluster_size[best_idx1] += cluster_size[best_idx2]; + for (i = 0; i < symbols_size; ++i) { + if (symbols[i] == best_idx2) { + symbols[i] = best_idx1; + } + } + for (i = 0; i < num_clusters; ++i) { + if (clusters[i] == best_idx2) { + memmove(&clusters[i], &clusters[i + 1], + (num_clusters - i - 1) * sizeof(clusters[0])); + break; + } + } + --num_clusters; + { + /* Remove pairs intersecting the just combined best pair. */ + size_t copy_to_idx = 0; + for (i = 0; i < num_pairs; ++i) { + HistogramPair* p = &pairs[i]; + if (p->idx1 == best_idx1 || p->idx2 == best_idx1 || + p->idx1 == best_idx2 || p->idx2 == best_idx2) { + /* Remove invalid pair from the queue. */ + continue; + } + if (HistogramPairIsLess(&pairs[0], p)) { + /* Replace the top of the queue if needed. */ + HistogramPair front = pairs[0]; + pairs[0] = *p; + pairs[copy_to_idx] = front; + } else { + pairs[copy_to_idx] = *p; + } + ++copy_to_idx; + } + num_pairs = copy_to_idx; + } + + /* Push new pairs formed with the combined histogram to the heap. */ + for (i = 0; i < num_clusters; ++i) { + FN(BrotliCompareAndPushToQueue)(out, cluster_size, best_idx1, clusters[i], + max_num_pairs, &pairs[0], &num_pairs); + } + } + return num_clusters; +}) + +/* What is the bit cost of moving histogram from cur_symbol to candidate. */ +BROTLI_INTERNAL double FN(BrotliHistogramBitCostDistance)( + const HistogramType* histogram, const HistogramType* candidate) CODE({ + if (histogram->total_count_ == 0) { + return 0.0; + } else { + HistogramType tmp = *histogram; + FN(HistogramAddHistogram)(&tmp, candidate); + return FN(BrotliPopulationCost)(&tmp) - candidate->bit_cost_; + } +}) + +/* Find the best 'out' histogram for each of the 'in' histograms. + When called, clusters[0..num_clusters) contains the unique values from + symbols[0..in_size), but this property is not preserved in this function. + Note: we assume that out[]->bit_cost_ is already up-to-date. */ +BROTLI_INTERNAL void FN(BrotliHistogramRemap)(const HistogramType* in, + size_t in_size, const uint32_t* clusters, size_t num_clusters, + HistogramType* out, uint32_t* symbols) CODE({ + size_t i; + for (i = 0; i < in_size; ++i) { + uint32_t best_out = i == 0 ? symbols[0] : symbols[i - 1]; + double best_bits = + FN(BrotliHistogramBitCostDistance)(&in[i], &out[best_out]); + size_t j; + for (j = 0; j < num_clusters; ++j) { + const double cur_bits = + FN(BrotliHistogramBitCostDistance)(&in[i], &out[clusters[j]]); + if (cur_bits < best_bits) { + best_bits = cur_bits; + best_out = clusters[j]; + } + } + symbols[i] = best_out; + } + + /* Recompute each out based on raw and symbols. */ + for (i = 0; i < num_clusters; ++i) { + FN(HistogramClear)(&out[clusters[i]]); + } + for (i = 0; i < in_size; ++i) { + FN(HistogramAddHistogram)(&out[symbols[i]], &in[i]); + } +}) + +/* Reorders elements of the out[0..length) array and changes values in + symbols[0..length) array in the following way: + * when called, symbols[] contains indexes into out[], and has N unique + values (possibly N < length) + * on return, symbols'[i] = f(symbols[i]) and + out'[symbols'[i]] = out[symbols[i]], for each 0 <= i < length, + where f is a bijection between the range of symbols[] and [0..N), and + the first occurrences of values in symbols'[i] come in consecutive + increasing order. + Returns N, the number of unique values in symbols[]. */ +BROTLI_INTERNAL size_t FN(BrotliHistogramReindex)(MemoryManager* m, + HistogramType* out, uint32_t* symbols, size_t length) CODE({ + static const uint32_t kInvalidIndex = BROTLI_UINT32_MAX; + uint32_t* new_index = BROTLI_ALLOC(m, uint32_t, length); + uint32_t next_index; + HistogramType* tmp; + size_t i; + if (BROTLI_IS_OOM(m)) return 0; + for (i = 0; i < length; ++i) { + new_index[i] = kInvalidIndex; + } + next_index = 0; + for (i = 0; i < length; ++i) { + if (new_index[symbols[i]] == kInvalidIndex) { + new_index[symbols[i]] = next_index; + ++next_index; + } + } + /* TODO: by using idea of "cycle-sort" we can avoid allocation of + tmp and reduce the number of copying by the factor of 2. */ + tmp = BROTLI_ALLOC(m, HistogramType, next_index); + if (BROTLI_IS_OOM(m)) return 0; + next_index = 0; + for (i = 0; i < length; ++i) { + if (new_index[symbols[i]] == next_index) { + tmp[next_index] = out[symbols[i]]; + ++next_index; + } + symbols[i] = new_index[symbols[i]]; + } + BROTLI_FREE(m, new_index); + for (i = 0; i < next_index; ++i) { + out[i] = tmp[i]; + } + BROTLI_FREE(m, tmp); + return next_index; +}) + +BROTLI_INTERNAL void FN(BrotliClusterHistograms)( + MemoryManager* m, const HistogramType* in, const size_t in_size, + size_t max_histograms, HistogramType* out, size_t* out_size, + uint32_t* histogram_symbols) CODE({ + uint32_t* cluster_size = BROTLI_ALLOC(m, uint32_t, in_size); + uint32_t* clusters = BROTLI_ALLOC(m, uint32_t, in_size); + size_t num_clusters = 0; + const size_t max_input_histograms = 64; + size_t pairs_capacity = max_input_histograms * max_input_histograms / 2; + /* For the first pass of clustering, we allow all pairs. */ + HistogramPair* pairs = BROTLI_ALLOC(m, HistogramPair, pairs_capacity + 1); + size_t i; + + if (BROTLI_IS_OOM(m)) return; + + for (i = 0; i < in_size; ++i) { + cluster_size[i] = 1; + } + + for (i = 0; i < in_size; ++i) { + out[i] = in[i]; + out[i].bit_cost_ = FN(BrotliPopulationCost)(&in[i]); + histogram_symbols[i] = (uint32_t)i; + } + + for (i = 0; i < in_size; i += max_input_histograms) { + size_t num_to_combine = + BROTLI_MIN(size_t, in_size - i, max_input_histograms); + size_t num_new_clusters; + size_t j; + for (j = 0; j < num_to_combine; ++j) { + clusters[num_clusters + j] = (uint32_t)(i + j); + } + num_new_clusters = + FN(BrotliHistogramCombine)(out, cluster_size, + &histogram_symbols[i], + &clusters[num_clusters], pairs, + num_to_combine, num_to_combine, + max_histograms, pairs_capacity); + num_clusters += num_new_clusters; + } + + { + /* For the second pass, we limit the total number of histogram pairs. + After this limit is reached, we only keep searching for the best pair. */ + size_t max_num_pairs = BROTLI_MIN(size_t, + 64 * num_clusters, (num_clusters / 2) * num_clusters); + BROTLI_ENSURE_CAPACITY( + m, HistogramPair, pairs, pairs_capacity, max_num_pairs + 1); + if (BROTLI_IS_OOM(m)) return; + + /* Collapse similar histograms. */ + num_clusters = FN(BrotliHistogramCombine)(out, cluster_size, + histogram_symbols, clusters, + pairs, num_clusters, in_size, + max_histograms, max_num_pairs); + } + BROTLI_FREE(m, pairs); + BROTLI_FREE(m, cluster_size); + /* Find the optimal map from original histograms to the final ones. */ + FN(BrotliHistogramRemap)(in, in_size, clusters, num_clusters, + out, histogram_symbols); + BROTLI_FREE(m, clusters); + /* Convert the context map to a canonical form. */ + *out_size = FN(BrotliHistogramReindex)(m, out, histogram_symbols, in_size); + if (BROTLI_IS_OOM(m)) return; +}) + +#undef HistogramType diff --git a/modules/brotli/enc/command.h b/modules/brotli/enc/command.h new file mode 100644 index 000000000..1aac85689 --- /dev/null +++ b/modules/brotli/enc/command.h @@ -0,0 +1,190 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* This class models a sequence of literals and a backward reference copy. */ + +#ifndef BROTLI_ENC_COMMAND_H_ +#define BROTLI_ENC_COMMAND_H_ + +#include "../common/constants.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./fast_log.h" +#include "./params.h" +#include "./prefix.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static uint32_t kInsBase[] = { 0, 1, 2, 3, 4, 5, 6, 8, 10, 14, 18, 26, 34, 50, + 66, 98, 130, 194, 322, 578, 1090, 2114, 6210, 22594 }; +static uint32_t kInsExtra[] = { 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, + 5, 5, 6, 7, 8, 9, 10, 12, 14, 24 }; +static uint32_t kCopyBase[] = { 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 18, 22, 30, + 38, 54, 70, 102, 134, 198, 326, 582, 1094, 2118 }; +static uint32_t kCopyExtra[] = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, + 4, 4, 5, 5, 6, 7, 8, 9, 10, 24 }; + +static BROTLI_INLINE uint16_t GetInsertLengthCode(size_t insertlen) { + if (insertlen < 6) { + return (uint16_t)insertlen; + } else if (insertlen < 130) { + uint32_t nbits = Log2FloorNonZero(insertlen - 2) - 1u; + return (uint16_t)((nbits << 1) + ((insertlen - 2) >> nbits) + 2); + } else if (insertlen < 2114) { + return (uint16_t)(Log2FloorNonZero(insertlen - 66) + 10); + } else if (insertlen < 6210) { + return 21u; + } else if (insertlen < 22594) { + return 22u; + } else { + return 23u; + } +} + +static BROTLI_INLINE uint16_t GetCopyLengthCode(size_t copylen) { + if (copylen < 10) { + return (uint16_t)(copylen - 2); + } else if (copylen < 134) { + uint32_t nbits = Log2FloorNonZero(copylen - 6) - 1u; + return (uint16_t)((nbits << 1) + ((copylen - 6) >> nbits) + 4); + } else if (copylen < 2118) { + return (uint16_t)(Log2FloorNonZero(copylen - 70) + 12); + } else { + return 23u; + } +} + +static BROTLI_INLINE uint16_t CombineLengthCodes( + uint16_t inscode, uint16_t copycode, BROTLI_BOOL use_last_distance) { + uint16_t bits64 = + (uint16_t)((copycode & 0x7u) | ((inscode & 0x7u) << 3u)); + if (use_last_distance && inscode < 8u && copycode < 16u) { + return (copycode < 8u) ? bits64 : (bits64 | 64u); + } else { + /* Specification: 5 Encoding of ... (last table) */ + /* offset = 2 * index, where index is in range [0..8] */ + uint32_t offset = 2u * ((copycode >> 3u) + 3u * (inscode >> 3u)); + /* All values in specification are K * 64, + where K = [2, 3, 6, 4, 5, 8, 7, 9, 10], + i + 1 = [1, 2, 3, 4, 5, 6, 7, 8, 9], + K - i - 1 = [1, 1, 3, 0, 0, 2, 0, 1, 2] = D. + All values in D require only 2 bits to encode. + Magic constant is shifted 6 bits left, to avoid final multiplication. */ + offset = (offset << 5u) + 0x40u + ((0x520D40u >> offset) & 0xC0u); + return (uint16_t)(offset | bits64); + } +} + +static BROTLI_INLINE void GetLengthCode(size_t insertlen, size_t copylen, + BROTLI_BOOL use_last_distance, + uint16_t* code) { + uint16_t inscode = GetInsertLengthCode(insertlen); + uint16_t copycode = GetCopyLengthCode(copylen); + *code = CombineLengthCodes(inscode, copycode, use_last_distance); +} + +static BROTLI_INLINE uint32_t GetInsertBase(uint16_t inscode) { + return kInsBase[inscode]; +} + +static BROTLI_INLINE uint32_t GetInsertExtra(uint16_t inscode) { + return kInsExtra[inscode]; +} + +static BROTLI_INLINE uint32_t GetCopyBase(uint16_t copycode) { + return kCopyBase[copycode]; +} + +static BROTLI_INLINE uint32_t GetCopyExtra(uint16_t copycode) { + return kCopyExtra[copycode]; +} + +typedef struct Command { + uint32_t insert_len_; + /* Stores copy_len in low 25 bits and copy_code - copy_len in high 7 bit. */ + uint32_t copy_len_; + /* Stores distance extra bits. */ + uint32_t dist_extra_; + uint16_t cmd_prefix_; + /* Stores distance code in low 10 bits + and number of extra bits in high 6 bits. */ + uint16_t dist_prefix_; +} Command; + +/* distance_code is e.g. 0 for same-as-last short code, or 16 for offset 1. */ +static BROTLI_INLINE void InitCommand(Command* self, + const BrotliDistanceParams* dist, size_t insertlen, + size_t copylen, int copylen_code_delta, size_t distance_code) { + /* Don't rely on signed int representation, use honest casts. */ + uint32_t delta = (uint8_t)((int8_t)copylen_code_delta); + self->insert_len_ = (uint32_t)insertlen; + self->copy_len_ = (uint32_t)(copylen | (delta << 25)); + /* The distance prefix and extra bits are stored in this Command as if + npostfix and ndirect were 0, they are only recomputed later after the + clustering if needed. */ + PrefixEncodeCopyDistance( + distance_code, dist->num_direct_distance_codes, + dist->distance_postfix_bits, &self->dist_prefix_, &self->dist_extra_); + GetLengthCode( + insertlen, (size_t)((int)copylen + copylen_code_delta), + TO_BROTLI_BOOL((self->dist_prefix_ & 0x3FF) == 0), &self->cmd_prefix_); +} + +static BROTLI_INLINE void InitInsertCommand(Command* self, size_t insertlen) { + self->insert_len_ = (uint32_t)insertlen; + self->copy_len_ = 4 << 25; + self->dist_extra_ = 0; + self->dist_prefix_ = BROTLI_NUM_DISTANCE_SHORT_CODES; + GetLengthCode(insertlen, 4, BROTLI_FALSE, &self->cmd_prefix_); +} + +static BROTLI_INLINE uint32_t CommandRestoreDistanceCode( + const Command* self, const BrotliDistanceParams* dist) { + if ((self->dist_prefix_ & 0x3FFu) < + BROTLI_NUM_DISTANCE_SHORT_CODES + dist->num_direct_distance_codes) { + return self->dist_prefix_ & 0x3FFu; + } else { + uint32_t dcode = self->dist_prefix_ & 0x3FFu; + uint32_t nbits = self->dist_prefix_ >> 10; + uint32_t extra = self->dist_extra_; + uint32_t postfix_mask = (1U << dist->distance_postfix_bits) - 1U; + uint32_t hcode = (dcode - dist->num_direct_distance_codes - + BROTLI_NUM_DISTANCE_SHORT_CODES) >> + dist->distance_postfix_bits; + uint32_t lcode = (dcode - dist->num_direct_distance_codes - + BROTLI_NUM_DISTANCE_SHORT_CODES) & postfix_mask; + uint32_t offset = ((2U + (hcode & 1U)) << nbits) - 4U; + return ((offset + extra) << dist->distance_postfix_bits) + lcode + + dist->num_direct_distance_codes + BROTLI_NUM_DISTANCE_SHORT_CODES; + } +} + +static BROTLI_INLINE uint32_t CommandDistanceContext(const Command* self) { + uint32_t r = self->cmd_prefix_ >> 6; + uint32_t c = self->cmd_prefix_ & 7; + if ((r == 0 || r == 2 || r == 4 || r == 7) && (c <= 2)) { + return c; + } + return 3; +} + +static BROTLI_INLINE uint32_t CommandCopyLen(const Command* self) { + return self->copy_len_ & 0x1FFFFFF; +} + +static BROTLI_INLINE uint32_t CommandCopyLenCode(const Command* self) { + uint32_t modifier = self->copy_len_ >> 25; + int32_t delta = (int8_t)((uint8_t)(modifier | ((modifier & 0x40) << 1))); + return (uint32_t)((int32_t)(self->copy_len_ & 0x1FFFFFF) + delta); +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_COMMAND_H_ */ diff --git a/modules/brotli/enc/compress_fragment.c b/modules/brotli/enc/compress_fragment.c new file mode 100644 index 000000000..9e50b2098 --- /dev/null +++ b/modules/brotli/enc/compress_fragment.c @@ -0,0 +1,790 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function for fast encoding of an input fragment, independently from the input + history. This function uses one-pass processing: when we find a backward + match, we immediately emit the corresponding command and literal codes to + the bit stream. + + Adapted from the CompressFragment() function in + https://github.com/google/snappy/blob/master/snappy.cc */ + +#include "./compress_fragment.h" + +#include <string.h> /* memcmp, memcpy, memset */ + +#include "../common/constants.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./brotli_bit_stream.h" +#include "./entropy_encode.h" +#include "./fast_log.h" +#include "./find_match_length.h" +#include "./memory.h" +#include "./write_bits.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define MAX_DISTANCE (long)BROTLI_MAX_BACKWARD_LIMIT(18) + +/* kHashMul32 multiplier has these properties: + * The multiplier must be odd. Otherwise we may lose the highest bit. + * No long streaks of ones or zeros. + * There is no effort to ensure that it is a prime, the oddity is enough + for this use. + * The number has been tuned heuristically against compression benchmarks. */ +static const uint32_t kHashMul32 = 0x1E35A7BD; + +static BROTLI_INLINE uint32_t Hash(const uint8_t* p, size_t shift) { + const uint64_t h = (BROTLI_UNALIGNED_LOAD64LE(p) << 24) * kHashMul32; + return (uint32_t)(h >> shift); +} + +static BROTLI_INLINE uint32_t HashBytesAtOffset( + uint64_t v, int offset, size_t shift) { + BROTLI_DCHECK(offset >= 0); + BROTLI_DCHECK(offset <= 3); + { + const uint64_t h = ((v >> (8 * offset)) << 24) * kHashMul32; + return (uint32_t)(h >> shift); + } +} + +static BROTLI_INLINE BROTLI_BOOL IsMatch(const uint8_t* p1, const uint8_t* p2) { + return TO_BROTLI_BOOL( + BrotliUnalignedRead32(p1) == BrotliUnalignedRead32(p2) && + p1[4] == p2[4]); +} + +/* Builds a literal prefix code into "depths" and "bits" based on the statistics + of the "input" string and stores it into the bit stream. + Note that the prefix code here is built from the pre-LZ77 input, therefore + we can only approximate the statistics of the actual literal stream. + Moreover, for long inputs we build a histogram from a sample of the input + and thus have to assign a non-zero depth for each literal. + Returns estimated compression ratio millibytes/char for encoding given input + with generated code. */ +static size_t BuildAndStoreLiteralPrefixCode(MemoryManager* m, + const uint8_t* input, + const size_t input_size, + uint8_t depths[256], + uint16_t bits[256], + size_t* storage_ix, + uint8_t* storage) { + uint32_t histogram[256] = { 0 }; + size_t histogram_total; + size_t i; + if (input_size < (1 << 15)) { + for (i = 0; i < input_size; ++i) { + ++histogram[input[i]]; + } + histogram_total = input_size; + for (i = 0; i < 256; ++i) { + /* We weigh the first 11 samples with weight 3 to account for the + balancing effect of the LZ77 phase on the histogram. */ + const uint32_t adjust = 2 * BROTLI_MIN(uint32_t, histogram[i], 11u); + histogram[i] += adjust; + histogram_total += adjust; + } + } else { + static const size_t kSampleRate = 29; + for (i = 0; i < input_size; i += kSampleRate) { + ++histogram[input[i]]; + } + histogram_total = (input_size + kSampleRate - 1) / kSampleRate; + for (i = 0; i < 256; ++i) { + /* We add 1 to each population count to avoid 0 bit depths (since this is + only a sample and we don't know if the symbol appears or not), and we + weigh the first 11 samples with weight 3 to account for the balancing + effect of the LZ77 phase on the histogram (more frequent symbols are + more likely to be in backward references instead as literals). */ + const uint32_t adjust = 1 + 2 * BROTLI_MIN(uint32_t, histogram[i], 11u); + histogram[i] += adjust; + histogram_total += adjust; + } + } + BrotliBuildAndStoreHuffmanTreeFast(m, histogram, histogram_total, + /* max_bits = */ 8, + depths, bits, storage_ix, storage); + if (BROTLI_IS_OOM(m)) return 0; + { + size_t literal_ratio = 0; + for (i = 0; i < 256; ++i) { + if (histogram[i]) literal_ratio += histogram[i] * depths[i]; + } + /* Estimated encoding ratio, millibytes per symbol. */ + return (literal_ratio * 125) / histogram_total; + } +} + +/* Builds a command and distance prefix code (each 64 symbols) into "depth" and + "bits" based on "histogram" and stores it into the bit stream. */ +static void BuildAndStoreCommandPrefixCode(const uint32_t histogram[128], + uint8_t depth[128], uint16_t bits[128], size_t* storage_ix, + uint8_t* storage) { + /* Tree size for building a tree over 64 symbols is 2 * 64 + 1. */ + HuffmanTree tree[129]; + uint8_t cmd_depth[BROTLI_NUM_COMMAND_SYMBOLS] = { 0 }; + uint16_t cmd_bits[64]; + + BrotliCreateHuffmanTree(histogram, 64, 15, tree, depth); + BrotliCreateHuffmanTree(&histogram[64], 64, 14, tree, &depth[64]); + /* We have to jump through a few hoops here in order to compute + the command bits because the symbols are in a different order than in + the full alphabet. This looks complicated, but having the symbols + in this order in the command bits saves a few branches in the Emit* + functions. */ + memcpy(cmd_depth, depth, 24); + memcpy(cmd_depth + 24, depth + 40, 8); + memcpy(cmd_depth + 32, depth + 24, 8); + memcpy(cmd_depth + 40, depth + 48, 8); + memcpy(cmd_depth + 48, depth + 32, 8); + memcpy(cmd_depth + 56, depth + 56, 8); + BrotliConvertBitDepthsToSymbols(cmd_depth, 64, cmd_bits); + memcpy(bits, cmd_bits, 48); + memcpy(bits + 24, cmd_bits + 32, 16); + memcpy(bits + 32, cmd_bits + 48, 16); + memcpy(bits + 40, cmd_bits + 24, 16); + memcpy(bits + 48, cmd_bits + 40, 16); + memcpy(bits + 56, cmd_bits + 56, 16); + BrotliConvertBitDepthsToSymbols(&depth[64], 64, &bits[64]); + { + /* Create the bit length array for the full command alphabet. */ + size_t i; + memset(cmd_depth, 0, 64); /* only 64 first values were used */ + memcpy(cmd_depth, depth, 8); + memcpy(cmd_depth + 64, depth + 8, 8); + memcpy(cmd_depth + 128, depth + 16, 8); + memcpy(cmd_depth + 192, depth + 24, 8); + memcpy(cmd_depth + 384, depth + 32, 8); + for (i = 0; i < 8; ++i) { + cmd_depth[128 + 8 * i] = depth[40 + i]; + cmd_depth[256 + 8 * i] = depth[48 + i]; + cmd_depth[448 + 8 * i] = depth[56 + i]; + } + BrotliStoreHuffmanTree( + cmd_depth, BROTLI_NUM_COMMAND_SYMBOLS, tree, storage_ix, storage); + } + BrotliStoreHuffmanTree(&depth[64], 64, tree, storage_ix, storage); +} + +/* REQUIRES: insertlen < 6210 */ +static BROTLI_INLINE void EmitInsertLen(size_t insertlen, + const uint8_t depth[128], + const uint16_t bits[128], + uint32_t histo[128], + size_t* storage_ix, + uint8_t* storage) { + if (insertlen < 6) { + const size_t code = insertlen + 40; + BrotliWriteBits(depth[code], bits[code], storage_ix, storage); + ++histo[code]; + } else if (insertlen < 130) { + const size_t tail = insertlen - 2; + const uint32_t nbits = Log2FloorNonZero(tail) - 1u; + const size_t prefix = tail >> nbits; + const size_t inscode = (nbits << 1) + prefix + 42; + BrotliWriteBits(depth[inscode], bits[inscode], storage_ix, storage); + BrotliWriteBits(nbits, tail - (prefix << nbits), storage_ix, storage); + ++histo[inscode]; + } else if (insertlen < 2114) { + const size_t tail = insertlen - 66; + const uint32_t nbits = Log2FloorNonZero(tail); + const size_t code = nbits + 50; + BrotliWriteBits(depth[code], bits[code], storage_ix, storage); + BrotliWriteBits(nbits, tail - ((size_t)1 << nbits), storage_ix, storage); + ++histo[code]; + } else { + BrotliWriteBits(depth[61], bits[61], storage_ix, storage); + BrotliWriteBits(12, insertlen - 2114, storage_ix, storage); + ++histo[61]; + } +} + +static BROTLI_INLINE void EmitLongInsertLen(size_t insertlen, + const uint8_t depth[128], + const uint16_t bits[128], + uint32_t histo[128], + size_t* storage_ix, + uint8_t* storage) { + if (insertlen < 22594) { + BrotliWriteBits(depth[62], bits[62], storage_ix, storage); + BrotliWriteBits(14, insertlen - 6210, storage_ix, storage); + ++histo[62]; + } else { + BrotliWriteBits(depth[63], bits[63], storage_ix, storage); + BrotliWriteBits(24, insertlen - 22594, storage_ix, storage); + ++histo[63]; + } +} + +static BROTLI_INLINE void EmitCopyLen(size_t copylen, + const uint8_t depth[128], + const uint16_t bits[128], + uint32_t histo[128], + size_t* storage_ix, + uint8_t* storage) { + if (copylen < 10) { + BrotliWriteBits( + depth[copylen + 14], bits[copylen + 14], storage_ix, storage); + ++histo[copylen + 14]; + } else if (copylen < 134) { + const size_t tail = copylen - 6; + const uint32_t nbits = Log2FloorNonZero(tail) - 1u; + const size_t prefix = tail >> nbits; + const size_t code = (nbits << 1) + prefix + 20; + BrotliWriteBits(depth[code], bits[code], storage_ix, storage); + BrotliWriteBits(nbits, tail - (prefix << nbits), storage_ix, storage); + ++histo[code]; + } else if (copylen < 2118) { + const size_t tail = copylen - 70; + const uint32_t nbits = Log2FloorNonZero(tail); + const size_t code = nbits + 28; + BrotliWriteBits(depth[code], bits[code], storage_ix, storage); + BrotliWriteBits(nbits, tail - ((size_t)1 << nbits), storage_ix, storage); + ++histo[code]; + } else { + BrotliWriteBits(depth[39], bits[39], storage_ix, storage); + BrotliWriteBits(24, copylen - 2118, storage_ix, storage); + ++histo[39]; + } +} + +static BROTLI_INLINE void EmitCopyLenLastDistance(size_t copylen, + const uint8_t depth[128], + const uint16_t bits[128], + uint32_t histo[128], + size_t* storage_ix, + uint8_t* storage) { + if (copylen < 12) { + BrotliWriteBits(depth[copylen - 4], bits[copylen - 4], storage_ix, storage); + ++histo[copylen - 4]; + } else if (copylen < 72) { + const size_t tail = copylen - 8; + const uint32_t nbits = Log2FloorNonZero(tail) - 1; + const size_t prefix = tail >> nbits; + const size_t code = (nbits << 1) + prefix + 4; + BrotliWriteBits(depth[code], bits[code], storage_ix, storage); + BrotliWriteBits(nbits, tail - (prefix << nbits), storage_ix, storage); + ++histo[code]; + } else if (copylen < 136) { + const size_t tail = copylen - 8; + const size_t code = (tail >> 5) + 30; + BrotliWriteBits(depth[code], bits[code], storage_ix, storage); + BrotliWriteBits(5, tail & 31, storage_ix, storage); + BrotliWriteBits(depth[64], bits[64], storage_ix, storage); + ++histo[code]; + ++histo[64]; + } else if (copylen < 2120) { + const size_t tail = copylen - 72; + const uint32_t nbits = Log2FloorNonZero(tail); + const size_t code = nbits + 28; + BrotliWriteBits(depth[code], bits[code], storage_ix, storage); + BrotliWriteBits(nbits, tail - ((size_t)1 << nbits), storage_ix, storage); + BrotliWriteBits(depth[64], bits[64], storage_ix, storage); + ++histo[code]; + ++histo[64]; + } else { + BrotliWriteBits(depth[39], bits[39], storage_ix, storage); + BrotliWriteBits(24, copylen - 2120, storage_ix, storage); + BrotliWriteBits(depth[64], bits[64], storage_ix, storage); + ++histo[39]; + ++histo[64]; + } +} + +static BROTLI_INLINE void EmitDistance(size_t distance, + const uint8_t depth[128], + const uint16_t bits[128], + uint32_t histo[128], + size_t* storage_ix, uint8_t* storage) { + const size_t d = distance + 3; + const uint32_t nbits = Log2FloorNonZero(d) - 1u; + const size_t prefix = (d >> nbits) & 1; + const size_t offset = (2 + prefix) << nbits; + const size_t distcode = 2 * (nbits - 1) + prefix + 80; + BrotliWriteBits(depth[distcode], bits[distcode], storage_ix, storage); + BrotliWriteBits(nbits, d - offset, storage_ix, storage); + ++histo[distcode]; +} + +static BROTLI_INLINE void EmitLiterals(const uint8_t* input, const size_t len, + const uint8_t depth[256], + const uint16_t bits[256], + size_t* storage_ix, uint8_t* storage) { + size_t j; + for (j = 0; j < len; j++) { + const uint8_t lit = input[j]; + BrotliWriteBits(depth[lit], bits[lit], storage_ix, storage); + } +} + +/* REQUIRES: len <= 1 << 24. */ +static void BrotliStoreMetaBlockHeader( + size_t len, BROTLI_BOOL is_uncompressed, size_t* storage_ix, + uint8_t* storage) { + size_t nibbles = 6; + /* ISLAST */ + BrotliWriteBits(1, 0, storage_ix, storage); + if (len <= (1U << 16)) { + nibbles = 4; + } else if (len <= (1U << 20)) { + nibbles = 5; + } + BrotliWriteBits(2, nibbles - 4, storage_ix, storage); + BrotliWriteBits(nibbles * 4, len - 1, storage_ix, storage); + /* ISUNCOMPRESSED */ + BrotliWriteBits(1, (uint64_t)is_uncompressed, storage_ix, storage); +} + +static void UpdateBits(size_t n_bits, uint32_t bits, size_t pos, + uint8_t* array) { + while (n_bits > 0) { + size_t byte_pos = pos >> 3; + size_t n_unchanged_bits = pos & 7; + size_t n_changed_bits = BROTLI_MIN(size_t, n_bits, 8 - n_unchanged_bits); + size_t total_bits = n_unchanged_bits + n_changed_bits; + uint32_t mask = + (~((1u << total_bits) - 1u)) | ((1u << n_unchanged_bits) - 1u); + uint32_t unchanged_bits = array[byte_pos] & mask; + uint32_t changed_bits = bits & ((1u << n_changed_bits) - 1u); + array[byte_pos] = + (uint8_t)((changed_bits << n_unchanged_bits) | unchanged_bits); + n_bits -= n_changed_bits; + bits >>= n_changed_bits; + pos += n_changed_bits; + } +} + +static void RewindBitPosition(const size_t new_storage_ix, + size_t* storage_ix, uint8_t* storage) { + const size_t bitpos = new_storage_ix & 7; + const size_t mask = (1u << bitpos) - 1; + storage[new_storage_ix >> 3] &= (uint8_t)mask; + *storage_ix = new_storage_ix; +} + +static BROTLI_BOOL ShouldMergeBlock( + const uint8_t* data, size_t len, const uint8_t* depths) { + size_t histo[256] = { 0 }; + static const size_t kSampleRate = 43; + size_t i; + for (i = 0; i < len; i += kSampleRate) { + ++histo[data[i]]; + } + { + const size_t total = (len + kSampleRate - 1) / kSampleRate; + double r = (FastLog2(total) + 0.5) * (double)total + 200; + for (i = 0; i < 256; ++i) { + r -= (double)histo[i] * (depths[i] + FastLog2(histo[i])); + } + return TO_BROTLI_BOOL(r >= 0.0); + } +} + +/* Acceptable loss for uncompressible speedup is 2% */ +#define MIN_RATIO 980 + +static BROTLI_INLINE BROTLI_BOOL ShouldUseUncompressedMode( + const uint8_t* metablock_start, const uint8_t* next_emit, + const size_t insertlen, const size_t literal_ratio) { + const size_t compressed = (size_t)(next_emit - metablock_start); + if (compressed * 50 > insertlen) { + return BROTLI_FALSE; + } else { + return TO_BROTLI_BOOL(literal_ratio > MIN_RATIO); + } +} + +static void EmitUncompressedMetaBlock(const uint8_t* begin, const uint8_t* end, + const size_t storage_ix_start, + size_t* storage_ix, uint8_t* storage) { + const size_t len = (size_t)(end - begin); + RewindBitPosition(storage_ix_start, storage_ix, storage); + BrotliStoreMetaBlockHeader(len, 1, storage_ix, storage); + *storage_ix = (*storage_ix + 7u) & ~7u; + memcpy(&storage[*storage_ix >> 3], begin, len); + *storage_ix += len << 3; + storage[*storage_ix >> 3] = 0; +} + +static uint32_t kCmdHistoSeed[128] = { + 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 0, 0, 0, 0, +}; + +static BROTLI_INLINE void BrotliCompressFragmentFastImpl( + MemoryManager* m, const uint8_t* input, size_t input_size, + BROTLI_BOOL is_last, int* table, size_t table_bits, uint8_t cmd_depth[128], + uint16_t cmd_bits[128], size_t* cmd_code_numbits, uint8_t* cmd_code, + size_t* storage_ix, uint8_t* storage) { + uint32_t cmd_histo[128]; + const uint8_t* ip_end; + + /* "next_emit" is a pointer to the first byte that is not covered by a + previous copy. Bytes between "next_emit" and the start of the next copy or + the end of the input will be emitted as literal bytes. */ + const uint8_t* next_emit = input; + /* Save the start of the first block for position and distance computations. + */ + const uint8_t* base_ip = input; + + static const size_t kFirstBlockSize = 3 << 15; + static const size_t kMergeBlockSize = 1 << 16; + + const size_t kInputMarginBytes = BROTLI_WINDOW_GAP; + const size_t kMinMatchLen = 5; + + const uint8_t* metablock_start = input; + size_t block_size = BROTLI_MIN(size_t, input_size, kFirstBlockSize); + size_t total_block_size = block_size; + /* Save the bit position of the MLEN field of the meta-block header, so that + we can update it later if we decide to extend this meta-block. */ + size_t mlen_storage_ix = *storage_ix + 3; + + uint8_t lit_depth[256]; + uint16_t lit_bits[256]; + + size_t literal_ratio; + + const uint8_t* ip; + int last_distance; + + const size_t shift = 64u - table_bits; + + BrotliStoreMetaBlockHeader(block_size, 0, storage_ix, storage); + /* No block splits, no contexts. */ + BrotliWriteBits(13, 0, storage_ix, storage); + + literal_ratio = BuildAndStoreLiteralPrefixCode( + m, input, block_size, lit_depth, lit_bits, storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + + { + /* Store the pre-compressed command and distance prefix codes. */ + size_t i; + for (i = 0; i + 7 < *cmd_code_numbits; i += 8) { + BrotliWriteBits(8, cmd_code[i >> 3], storage_ix, storage); + } + } + BrotliWriteBits(*cmd_code_numbits & 7, cmd_code[*cmd_code_numbits >> 3], + storage_ix, storage); + + emit_commands: + /* Initialize the command and distance histograms. We will gather + statistics of command and distance codes during the processing + of this block and use it to update the command and distance + prefix codes for the next block. */ + memcpy(cmd_histo, kCmdHistoSeed, sizeof(kCmdHistoSeed)); + + /* "ip" is the input pointer. */ + ip = input; + last_distance = -1; + ip_end = input + block_size; + + if (BROTLI_PREDICT_TRUE(block_size >= kInputMarginBytes)) { + /* For the last block, we need to keep a 16 bytes margin so that we can be + sure that all distances are at most window size - 16. + For all other blocks, we only need to keep a margin of 5 bytes so that + we don't go over the block size with a copy. */ + const size_t len_limit = BROTLI_MIN(size_t, block_size - kMinMatchLen, + input_size - kInputMarginBytes); + const uint8_t* ip_limit = input + len_limit; + + uint32_t next_hash; + for (next_hash = Hash(++ip, shift); ; ) { + /* Step 1: Scan forward in the input looking for a 5-byte-long match. + If we get close to exhausting the input then goto emit_remainder. + + Heuristic match skipping: If 32 bytes are scanned with no matches + found, start looking only at every other byte. If 32 more bytes are + scanned, look at every third byte, etc.. When a match is found, + immediately go back to looking at every byte. This is a small loss + (~5% performance, ~0.1% density) for compressible data due to more + bookkeeping, but for non-compressible data (such as JPEG) it's a huge + win since the compressor quickly "realizes" the data is incompressible + and doesn't bother looking for matches everywhere. + + The "skip" variable keeps track of how many bytes there are since the + last match; dividing it by 32 (i.e. right-shifting by five) gives the + number of bytes to move ahead for each iteration. */ + uint32_t skip = 32; + + const uint8_t* next_ip = ip; + const uint8_t* candidate; + BROTLI_DCHECK(next_emit < ip); +trawl: + do { + uint32_t hash = next_hash; + uint32_t bytes_between_hash_lookups = skip++ >> 5; + BROTLI_DCHECK(hash == Hash(next_ip, shift)); + ip = next_ip; + next_ip = ip + bytes_between_hash_lookups; + if (BROTLI_PREDICT_FALSE(next_ip > ip_limit)) { + goto emit_remainder; + } + next_hash = Hash(next_ip, shift); + candidate = ip - last_distance; + if (IsMatch(ip, candidate)) { + if (BROTLI_PREDICT_TRUE(candidate < ip)) { + table[hash] = (int)(ip - base_ip); + break; + } + } + candidate = base_ip + table[hash]; + BROTLI_DCHECK(candidate >= base_ip); + BROTLI_DCHECK(candidate < ip); + + table[hash] = (int)(ip - base_ip); + } while (BROTLI_PREDICT_TRUE(!IsMatch(ip, candidate))); + + /* Check copy distance. If candidate is not feasible, continue search. + Checking is done outside of hot loop to reduce overhead. */ + if (ip - candidate > MAX_DISTANCE) goto trawl; + + /* Step 2: Emit the found match together with the literal bytes from + "next_emit" to the bit stream, and then see if we can find a next match + immediately afterwards. Repeat until we find no match for the input + without emitting some literal bytes. */ + + { + /* We have a 5-byte match at ip, and we need to emit bytes in + [next_emit, ip). */ + const uint8_t* base = ip; + size_t matched = 5 + FindMatchLengthWithLimit( + candidate + 5, ip + 5, (size_t)(ip_end - ip) - 5); + int distance = (int)(base - candidate); /* > 0 */ + size_t insert = (size_t)(base - next_emit); + ip += matched; + BROTLI_DCHECK(0 == memcmp(base, candidate, matched)); + if (BROTLI_PREDICT_TRUE(insert < 6210)) { + EmitInsertLen(insert, cmd_depth, cmd_bits, cmd_histo, + storage_ix, storage); + } else if (ShouldUseUncompressedMode(metablock_start, next_emit, insert, + literal_ratio)) { + EmitUncompressedMetaBlock(metablock_start, base, mlen_storage_ix - 3, + storage_ix, storage); + input_size -= (size_t)(base - input); + input = base; + next_emit = input; + goto next_block; + } else { + EmitLongInsertLen(insert, cmd_depth, cmd_bits, cmd_histo, + storage_ix, storage); + } + EmitLiterals(next_emit, insert, lit_depth, lit_bits, + storage_ix, storage); + if (distance == last_distance) { + BrotliWriteBits(cmd_depth[64], cmd_bits[64], storage_ix, storage); + ++cmd_histo[64]; + } else { + EmitDistance((size_t)distance, cmd_depth, cmd_bits, + cmd_histo, storage_ix, storage); + last_distance = distance; + } + EmitCopyLenLastDistance(matched, cmd_depth, cmd_bits, cmd_histo, + storage_ix, storage); + + next_emit = ip; + if (BROTLI_PREDICT_FALSE(ip >= ip_limit)) { + goto emit_remainder; + } + /* We could immediately start working at ip now, but to improve + compression we first update "table" with the hashes of some positions + within the last copy. */ + { + uint64_t input_bytes = BROTLI_UNALIGNED_LOAD64LE(ip - 3); + uint32_t prev_hash = HashBytesAtOffset(input_bytes, 0, shift); + uint32_t cur_hash = HashBytesAtOffset(input_bytes, 3, shift); + table[prev_hash] = (int)(ip - base_ip - 3); + prev_hash = HashBytesAtOffset(input_bytes, 1, shift); + table[prev_hash] = (int)(ip - base_ip - 2); + prev_hash = HashBytesAtOffset(input_bytes, 2, shift); + table[prev_hash] = (int)(ip - base_ip - 1); + + candidate = base_ip + table[cur_hash]; + table[cur_hash] = (int)(ip - base_ip); + } + } + + while (IsMatch(ip, candidate)) { + /* We have a 5-byte match at ip, and no need to emit any literal bytes + prior to ip. */ + const uint8_t* base = ip; + size_t matched = 5 + FindMatchLengthWithLimit( + candidate + 5, ip + 5, (size_t)(ip_end - ip) - 5); + if (ip - candidate > MAX_DISTANCE) break; + ip += matched; + last_distance = (int)(base - candidate); /* > 0 */ + BROTLI_DCHECK(0 == memcmp(base, candidate, matched)); + EmitCopyLen(matched, cmd_depth, cmd_bits, cmd_histo, + storage_ix, storage); + EmitDistance((size_t)last_distance, cmd_depth, cmd_bits, + cmd_histo, storage_ix, storage); + + next_emit = ip; + if (BROTLI_PREDICT_FALSE(ip >= ip_limit)) { + goto emit_remainder; + } + /* We could immediately start working at ip now, but to improve + compression we first update "table" with the hashes of some positions + within the last copy. */ + { + uint64_t input_bytes = BROTLI_UNALIGNED_LOAD64LE(ip - 3); + uint32_t prev_hash = HashBytesAtOffset(input_bytes, 0, shift); + uint32_t cur_hash = HashBytesAtOffset(input_bytes, 3, shift); + table[prev_hash] = (int)(ip - base_ip - 3); + prev_hash = HashBytesAtOffset(input_bytes, 1, shift); + table[prev_hash] = (int)(ip - base_ip - 2); + prev_hash = HashBytesAtOffset(input_bytes, 2, shift); + table[prev_hash] = (int)(ip - base_ip - 1); + + candidate = base_ip + table[cur_hash]; + table[cur_hash] = (int)(ip - base_ip); + } + } + + next_hash = Hash(++ip, shift); + } + } + + emit_remainder: + BROTLI_DCHECK(next_emit <= ip_end); + input += block_size; + input_size -= block_size; + block_size = BROTLI_MIN(size_t, input_size, kMergeBlockSize); + + /* Decide if we want to continue this meta-block instead of emitting the + last insert-only command. */ + if (input_size > 0 && + total_block_size + block_size <= (1 << 20) && + ShouldMergeBlock(input, block_size, lit_depth)) { + BROTLI_DCHECK(total_block_size > (1 << 16)); + /* Update the size of the current meta-block and continue emitting commands. + We can do this because the current size and the new size both have 5 + nibbles. */ + total_block_size += block_size; + UpdateBits(20, (uint32_t)(total_block_size - 1), mlen_storage_ix, storage); + goto emit_commands; + } + + /* Emit the remaining bytes as literals. */ + if (next_emit < ip_end) { + const size_t insert = (size_t)(ip_end - next_emit); + if (BROTLI_PREDICT_TRUE(insert < 6210)) { + EmitInsertLen(insert, cmd_depth, cmd_bits, cmd_histo, + storage_ix, storage); + EmitLiterals(next_emit, insert, lit_depth, lit_bits, storage_ix, storage); + } else if (ShouldUseUncompressedMode(metablock_start, next_emit, insert, + literal_ratio)) { + EmitUncompressedMetaBlock(metablock_start, ip_end, mlen_storage_ix - 3, + storage_ix, storage); + } else { + EmitLongInsertLen(insert, cmd_depth, cmd_bits, cmd_histo, + storage_ix, storage); + EmitLiterals(next_emit, insert, lit_depth, lit_bits, + storage_ix, storage); + } + } + next_emit = ip_end; + +next_block: + /* If we have more data, write a new meta-block header and prefix codes and + then continue emitting commands. */ + if (input_size > 0) { + metablock_start = input; + block_size = BROTLI_MIN(size_t, input_size, kFirstBlockSize); + total_block_size = block_size; + /* Save the bit position of the MLEN field of the meta-block header, so that + we can update it later if we decide to extend this meta-block. */ + mlen_storage_ix = *storage_ix + 3; + BrotliStoreMetaBlockHeader(block_size, 0, storage_ix, storage); + /* No block splits, no contexts. */ + BrotliWriteBits(13, 0, storage_ix, storage); + literal_ratio = BuildAndStoreLiteralPrefixCode( + m, input, block_size, lit_depth, lit_bits, storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + BuildAndStoreCommandPrefixCode(cmd_histo, cmd_depth, cmd_bits, + storage_ix, storage); + goto emit_commands; + } + + if (!is_last) { + /* If this is not the last block, update the command and distance prefix + codes for the next block and store the compressed forms. */ + cmd_code[0] = 0; + *cmd_code_numbits = 0; + BuildAndStoreCommandPrefixCode(cmd_histo, cmd_depth, cmd_bits, + cmd_code_numbits, cmd_code); + } +} + +#define FOR_TABLE_BITS_(X) X(9) X(11) X(13) X(15) + +#define BAKE_METHOD_PARAM_(B) \ +static BROTLI_NOINLINE void BrotliCompressFragmentFastImpl ## B( \ + MemoryManager* m, const uint8_t* input, size_t input_size, \ + BROTLI_BOOL is_last, int* table, uint8_t cmd_depth[128], \ + uint16_t cmd_bits[128], size_t* cmd_code_numbits, uint8_t* cmd_code, \ + size_t* storage_ix, uint8_t* storage) { \ + BrotliCompressFragmentFastImpl(m, input, input_size, is_last, table, B, \ + cmd_depth, cmd_bits, cmd_code_numbits, cmd_code, storage_ix, storage); \ +} +FOR_TABLE_BITS_(BAKE_METHOD_PARAM_) +#undef BAKE_METHOD_PARAM_ + +void BrotliCompressFragmentFast( + MemoryManager* m, const uint8_t* input, size_t input_size, + BROTLI_BOOL is_last, int* table, size_t table_size, uint8_t cmd_depth[128], + uint16_t cmd_bits[128], size_t* cmd_code_numbits, uint8_t* cmd_code, + size_t* storage_ix, uint8_t* storage) { + const size_t initial_storage_ix = *storage_ix; + const size_t table_bits = Log2FloorNonZero(table_size); + + if (input_size == 0) { + BROTLI_DCHECK(is_last); + BrotliWriteBits(1, 1, storage_ix, storage); /* islast */ + BrotliWriteBits(1, 1, storage_ix, storage); /* isempty */ + *storage_ix = (*storage_ix + 7u) & ~7u; + return; + } + + switch (table_bits) { +#define CASE_(B) \ + case B: \ + BrotliCompressFragmentFastImpl ## B( \ + m, input, input_size, is_last, table, cmd_depth, cmd_bits, \ + cmd_code_numbits, cmd_code, storage_ix, storage); \ + break; + FOR_TABLE_BITS_(CASE_) +#undef CASE_ + default: BROTLI_DCHECK(0); break; + } + + /* If output is larger than single uncompressed block, rewrite it. */ + if (*storage_ix - initial_storage_ix > 31 + (input_size << 3)) { + EmitUncompressedMetaBlock(input, input + input_size, initial_storage_ix, + storage_ix, storage); + } + + if (is_last) { + BrotliWriteBits(1, 1, storage_ix, storage); /* islast */ + BrotliWriteBits(1, 1, storage_ix, storage); /* isempty */ + *storage_ix = (*storage_ix + 7u) & ~7u; + } +} + +#undef FOR_TABLE_BITS_ + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/compress_fragment.h b/modules/brotli/enc/compress_fragment.h new file mode 100644 index 000000000..80007f5dc --- /dev/null +++ b/modules/brotli/enc/compress_fragment.h @@ -0,0 +1,61 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function for fast encoding of an input fragment, independently from the input + history. This function uses one-pass processing: when we find a backward + match, we immediately emit the corresponding command and literal codes to + the bit stream. */ + +#ifndef BROTLI_ENC_COMPRESS_FRAGMENT_H_ +#define BROTLI_ENC_COMPRESS_FRAGMENT_H_ + +#include "../common/platform.h" +#include <brotli/types.h> +#include "./memory.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* Compresses "input" string to the "*storage" buffer as one or more complete + meta-blocks, and updates the "*storage_ix" bit position. + + If "is_last" is 1, emits an additional empty last meta-block. + + "cmd_depth" and "cmd_bits" contain the command and distance prefix codes + (see comment in encode.h) used for the encoding of this input fragment. + If "is_last" is 0, they are updated to reflect the statistics + of this input fragment, to be used for the encoding of the next fragment. + + "*cmd_code_numbits" is the number of bits of the compressed representation + of the command and distance prefix codes, and "cmd_code" is an array of + at least "(*cmd_code_numbits + 7) >> 3" size that contains the compressed + command and distance prefix codes. If "is_last" is 0, these are also + updated to represent the updated "cmd_depth" and "cmd_bits". + + REQUIRES: "input_size" is greater than zero, or "is_last" is 1. + REQUIRES: "input_size" is less or equal to maximal metablock size (1 << 24). + REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero. + REQUIRES: "table_size" is an odd (9, 11, 13, 15) power of two + OUTPUT: maximal copy distance <= |input_size| + OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */ +BROTLI_INTERNAL void BrotliCompressFragmentFast(MemoryManager* m, + const uint8_t* input, + size_t input_size, + BROTLI_BOOL is_last, + int* table, size_t table_size, + uint8_t cmd_depth[128], + uint16_t cmd_bits[128], + size_t* cmd_code_numbits, + uint8_t* cmd_code, + size_t* storage_ix, + uint8_t* storage); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_COMPRESS_FRAGMENT_H_ */ diff --git a/modules/brotli/enc/compress_fragment_two_pass.c b/modules/brotli/enc/compress_fragment_two_pass.c new file mode 100644 index 000000000..f8a560638 --- /dev/null +++ b/modules/brotli/enc/compress_fragment_two_pass.c @@ -0,0 +1,645 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function for fast encoding of an input fragment, independently from the input + history. This function uses two-pass processing: in the first pass we save + the found backward matches and literal bytes into a buffer, and in the + second pass we emit them into the bit stream using prefix codes built based + on the actual command and literal byte histograms. */ + +#include "./compress_fragment_two_pass.h" + +#include <string.h> /* memcmp, memcpy, memset */ + +#include "../common/constants.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./bit_cost.h" +#include "./brotli_bit_stream.h" +#include "./entropy_encode.h" +#include "./fast_log.h" +#include "./find_match_length.h" +#include "./memory.h" +#include "./write_bits.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define MAX_DISTANCE (long)BROTLI_MAX_BACKWARD_LIMIT(18) + +/* kHashMul32 multiplier has these properties: + * The multiplier must be odd. Otherwise we may lose the highest bit. + * No long streaks of ones or zeros. + * There is no effort to ensure that it is a prime, the oddity is enough + for this use. + * The number has been tuned heuristically against compression benchmarks. */ +static const uint32_t kHashMul32 = 0x1E35A7BD; + +static BROTLI_INLINE uint32_t Hash(const uint8_t* p, + size_t shift, size_t length) { + const uint64_t h = + (BROTLI_UNALIGNED_LOAD64LE(p) << ((8 - length) * 8)) * kHashMul32; + return (uint32_t)(h >> shift); +} + +static BROTLI_INLINE uint32_t HashBytesAtOffset(uint64_t v, size_t offset, + size_t shift, size_t length) { + BROTLI_DCHECK(offset <= 8 - length); + { + const uint64_t h = ((v >> (8 * offset)) << ((8 - length) * 8)) * kHashMul32; + return (uint32_t)(h >> shift); + } +} + +static BROTLI_INLINE BROTLI_BOOL IsMatch(const uint8_t* p1, const uint8_t* p2, + size_t length) { + if (BrotliUnalignedRead32(p1) == BrotliUnalignedRead32(p2)) { + if (length == 4) return BROTLI_TRUE; + return TO_BROTLI_BOOL(p1[4] == p2[4] && p1[5] == p2[5]); + } + return BROTLI_FALSE; +} + +/* Builds a command and distance prefix code (each 64 symbols) into "depth" and + "bits" based on "histogram" and stores it into the bit stream. */ +static void BuildAndStoreCommandPrefixCode( + const uint32_t histogram[128], + uint8_t depth[128], uint16_t bits[128], + size_t* storage_ix, uint8_t* storage) { + /* Tree size for building a tree over 64 symbols is 2 * 64 + 1. */ + HuffmanTree tree[129]; + uint8_t cmd_depth[BROTLI_NUM_COMMAND_SYMBOLS] = { 0 }; + uint16_t cmd_bits[64]; + BrotliCreateHuffmanTree(histogram, 64, 15, tree, depth); + BrotliCreateHuffmanTree(&histogram[64], 64, 14, tree, &depth[64]); + /* We have to jump through a few hoops here in order to compute + the command bits because the symbols are in a different order than in + the full alphabet. This looks complicated, but having the symbols + in this order in the command bits saves a few branches in the Emit* + functions. */ + memcpy(cmd_depth, depth + 24, 24); + memcpy(cmd_depth + 24, depth, 8); + memcpy(cmd_depth + 32, depth + 48, 8); + memcpy(cmd_depth + 40, depth + 8, 8); + memcpy(cmd_depth + 48, depth + 56, 8); + memcpy(cmd_depth + 56, depth + 16, 8); + BrotliConvertBitDepthsToSymbols(cmd_depth, 64, cmd_bits); + memcpy(bits, cmd_bits + 24, 16); + memcpy(bits + 8, cmd_bits + 40, 16); + memcpy(bits + 16, cmd_bits + 56, 16); + memcpy(bits + 24, cmd_bits, 48); + memcpy(bits + 48, cmd_bits + 32, 16); + memcpy(bits + 56, cmd_bits + 48, 16); + BrotliConvertBitDepthsToSymbols(&depth[64], 64, &bits[64]); + { + /* Create the bit length array for the full command alphabet. */ + size_t i; + memset(cmd_depth, 0, 64); /* only 64 first values were used */ + memcpy(cmd_depth, depth + 24, 8); + memcpy(cmd_depth + 64, depth + 32, 8); + memcpy(cmd_depth + 128, depth + 40, 8); + memcpy(cmd_depth + 192, depth + 48, 8); + memcpy(cmd_depth + 384, depth + 56, 8); + for (i = 0; i < 8; ++i) { + cmd_depth[128 + 8 * i] = depth[i]; + cmd_depth[256 + 8 * i] = depth[8 + i]; + cmd_depth[448 + 8 * i] = depth[16 + i]; + } + BrotliStoreHuffmanTree( + cmd_depth, BROTLI_NUM_COMMAND_SYMBOLS, tree, storage_ix, storage); + } + BrotliStoreHuffmanTree(&depth[64], 64, tree, storage_ix, storage); +} + +static BROTLI_INLINE void EmitInsertLen( + uint32_t insertlen, uint32_t** commands) { + if (insertlen < 6) { + **commands = insertlen; + } else if (insertlen < 130) { + const uint32_t tail = insertlen - 2; + const uint32_t nbits = Log2FloorNonZero(tail) - 1u; + const uint32_t prefix = tail >> nbits; + const uint32_t inscode = (nbits << 1) + prefix + 2; + const uint32_t extra = tail - (prefix << nbits); + **commands = inscode | (extra << 8); + } else if (insertlen < 2114) { + const uint32_t tail = insertlen - 66; + const uint32_t nbits = Log2FloorNonZero(tail); + const uint32_t code = nbits + 10; + const uint32_t extra = tail - (1u << nbits); + **commands = code | (extra << 8); + } else if (insertlen < 6210) { + const uint32_t extra = insertlen - 2114; + **commands = 21 | (extra << 8); + } else if (insertlen < 22594) { + const uint32_t extra = insertlen - 6210; + **commands = 22 | (extra << 8); + } else { + const uint32_t extra = insertlen - 22594; + **commands = 23 | (extra << 8); + } + ++(*commands); +} + +static BROTLI_INLINE void EmitCopyLen(size_t copylen, uint32_t** commands) { + if (copylen < 10) { + **commands = (uint32_t)(copylen + 38); + } else if (copylen < 134) { + const size_t tail = copylen - 6; + const size_t nbits = Log2FloorNonZero(tail) - 1; + const size_t prefix = tail >> nbits; + const size_t code = (nbits << 1) + prefix + 44; + const size_t extra = tail - (prefix << nbits); + **commands = (uint32_t)(code | (extra << 8)); + } else if (copylen < 2118) { + const size_t tail = copylen - 70; + const size_t nbits = Log2FloorNonZero(tail); + const size_t code = nbits + 52; + const size_t extra = tail - ((size_t)1 << nbits); + **commands = (uint32_t)(code | (extra << 8)); + } else { + const size_t extra = copylen - 2118; + **commands = (uint32_t)(63 | (extra << 8)); + } + ++(*commands); +} + +static BROTLI_INLINE void EmitCopyLenLastDistance( + size_t copylen, uint32_t** commands) { + if (copylen < 12) { + **commands = (uint32_t)(copylen + 20); + ++(*commands); + } else if (copylen < 72) { + const size_t tail = copylen - 8; + const size_t nbits = Log2FloorNonZero(tail) - 1; + const size_t prefix = tail >> nbits; + const size_t code = (nbits << 1) + prefix + 28; + const size_t extra = tail - (prefix << nbits); + **commands = (uint32_t)(code | (extra << 8)); + ++(*commands); + } else if (copylen < 136) { + const size_t tail = copylen - 8; + const size_t code = (tail >> 5) + 54; + const size_t extra = tail & 31; + **commands = (uint32_t)(code | (extra << 8)); + ++(*commands); + **commands = 64; + ++(*commands); + } else if (copylen < 2120) { + const size_t tail = copylen - 72; + const size_t nbits = Log2FloorNonZero(tail); + const size_t code = nbits + 52; + const size_t extra = tail - ((size_t)1 << nbits); + **commands = (uint32_t)(code | (extra << 8)); + ++(*commands); + **commands = 64; + ++(*commands); + } else { + const size_t extra = copylen - 2120; + **commands = (uint32_t)(63 | (extra << 8)); + ++(*commands); + **commands = 64; + ++(*commands); + } +} + +static BROTLI_INLINE void EmitDistance(uint32_t distance, uint32_t** commands) { + uint32_t d = distance + 3; + uint32_t nbits = Log2FloorNonZero(d) - 1; + const uint32_t prefix = (d >> nbits) & 1; + const uint32_t offset = (2 + prefix) << nbits; + const uint32_t distcode = 2 * (nbits - 1) + prefix + 80; + uint32_t extra = d - offset; + **commands = distcode | (extra << 8); + ++(*commands); +} + +/* REQUIRES: len <= 1 << 24. */ +static void BrotliStoreMetaBlockHeader( + size_t len, BROTLI_BOOL is_uncompressed, size_t* storage_ix, + uint8_t* storage) { + size_t nibbles = 6; + /* ISLAST */ + BrotliWriteBits(1, 0, storage_ix, storage); + if (len <= (1U << 16)) { + nibbles = 4; + } else if (len <= (1U << 20)) { + nibbles = 5; + } + BrotliWriteBits(2, nibbles - 4, storage_ix, storage); + BrotliWriteBits(nibbles * 4, len - 1, storage_ix, storage); + /* ISUNCOMPRESSED */ + BrotliWriteBits(1, (uint64_t)is_uncompressed, storage_ix, storage); +} + +static BROTLI_INLINE void CreateCommands(const uint8_t* input, + size_t block_size, size_t input_size, const uint8_t* base_ip, int* table, + size_t table_bits, size_t min_match, + uint8_t** literals, uint32_t** commands) { + /* "ip" is the input pointer. */ + const uint8_t* ip = input; + const size_t shift = 64u - table_bits; + const uint8_t* ip_end = input + block_size; + /* "next_emit" is a pointer to the first byte that is not covered by a + previous copy. Bytes between "next_emit" and the start of the next copy or + the end of the input will be emitted as literal bytes. */ + const uint8_t* next_emit = input; + + int last_distance = -1; + const size_t kInputMarginBytes = BROTLI_WINDOW_GAP; + + if (BROTLI_PREDICT_TRUE(block_size >= kInputMarginBytes)) { + /* For the last block, we need to keep a 16 bytes margin so that we can be + sure that all distances are at most window size - 16. + For all other blocks, we only need to keep a margin of 5 bytes so that + we don't go over the block size with a copy. */ + const size_t len_limit = BROTLI_MIN(size_t, block_size - min_match, + input_size - kInputMarginBytes); + const uint8_t* ip_limit = input + len_limit; + + uint32_t next_hash; + for (next_hash = Hash(++ip, shift, min_match); ; ) { + /* Step 1: Scan forward in the input looking for a 6-byte-long match. + If we get close to exhausting the input then goto emit_remainder. + + Heuristic match skipping: If 32 bytes are scanned with no matches + found, start looking only at every other byte. If 32 more bytes are + scanned, look at every third byte, etc.. When a match is found, + immediately go back to looking at every byte. This is a small loss + (~5% performance, ~0.1% density) for compressible data due to more + bookkeeping, but for non-compressible data (such as JPEG) it's a huge + win since the compressor quickly "realizes" the data is incompressible + and doesn't bother looking for matches everywhere. + + The "skip" variable keeps track of how many bytes there are since the + last match; dividing it by 32 (ie. right-shifting by five) gives the + number of bytes to move ahead for each iteration. */ + uint32_t skip = 32; + + const uint8_t* next_ip = ip; + const uint8_t* candidate; + + BROTLI_DCHECK(next_emit < ip); +trawl: + do { + uint32_t hash = next_hash; + uint32_t bytes_between_hash_lookups = skip++ >> 5; + ip = next_ip; + BROTLI_DCHECK(hash == Hash(ip, shift, min_match)); + next_ip = ip + bytes_between_hash_lookups; + if (BROTLI_PREDICT_FALSE(next_ip > ip_limit)) { + goto emit_remainder; + } + next_hash = Hash(next_ip, shift, min_match); + candidate = ip - last_distance; + if (IsMatch(ip, candidate, min_match)) { + if (BROTLI_PREDICT_TRUE(candidate < ip)) { + table[hash] = (int)(ip - base_ip); + break; + } + } + candidate = base_ip + table[hash]; + BROTLI_DCHECK(candidate >= base_ip); + BROTLI_DCHECK(candidate < ip); + + table[hash] = (int)(ip - base_ip); + } while (BROTLI_PREDICT_TRUE(!IsMatch(ip, candidate, min_match))); + + /* Check copy distance. If candidate is not feasible, continue search. + Checking is done outside of hot loop to reduce overhead. */ + if (ip - candidate > MAX_DISTANCE) goto trawl; + + /* Step 2: Emit the found match together with the literal bytes from + "next_emit", and then see if we can find a next match immediately + afterwards. Repeat until we find no match for the input + without emitting some literal bytes. */ + + { + /* We have a 6-byte match at ip, and we need to emit bytes in + [next_emit, ip). */ + const uint8_t* base = ip; + size_t matched = min_match + FindMatchLengthWithLimit( + candidate + min_match, ip + min_match, + (size_t)(ip_end - ip) - min_match); + int distance = (int)(base - candidate); /* > 0 */ + int insert = (int)(base - next_emit); + ip += matched; + BROTLI_DCHECK(0 == memcmp(base, candidate, matched)); + EmitInsertLen((uint32_t)insert, commands); + memcpy(*literals, next_emit, (size_t)insert); + *literals += insert; + if (distance == last_distance) { + **commands = 64; + ++(*commands); + } else { + EmitDistance((uint32_t)distance, commands); + last_distance = distance; + } + EmitCopyLenLastDistance(matched, commands); + + next_emit = ip; + if (BROTLI_PREDICT_FALSE(ip >= ip_limit)) { + goto emit_remainder; + } + { + /* We could immediately start working at ip now, but to improve + compression we first update "table" with the hashes of some + positions within the last copy. */ + uint64_t input_bytes; + uint32_t cur_hash; + uint32_t prev_hash; + if (min_match == 4) { + input_bytes = BROTLI_UNALIGNED_LOAD64LE(ip - 3); + cur_hash = HashBytesAtOffset(input_bytes, 3, shift, min_match); + prev_hash = HashBytesAtOffset(input_bytes, 0, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 3); + prev_hash = HashBytesAtOffset(input_bytes, 1, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 2); + prev_hash = HashBytesAtOffset(input_bytes, 0, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 1); + } else { + input_bytes = BROTLI_UNALIGNED_LOAD64LE(ip - 5); + prev_hash = HashBytesAtOffset(input_bytes, 0, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 5); + prev_hash = HashBytesAtOffset(input_bytes, 1, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 4); + prev_hash = HashBytesAtOffset(input_bytes, 2, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 3); + input_bytes = BROTLI_UNALIGNED_LOAD64LE(ip - 2); + cur_hash = HashBytesAtOffset(input_bytes, 2, shift, min_match); + prev_hash = HashBytesAtOffset(input_bytes, 0, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 2); + prev_hash = HashBytesAtOffset(input_bytes, 1, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 1); + } + + candidate = base_ip + table[cur_hash]; + table[cur_hash] = (int)(ip - base_ip); + } + } + + while (ip - candidate <= MAX_DISTANCE && + IsMatch(ip, candidate, min_match)) { + /* We have a 6-byte match at ip, and no need to emit any + literal bytes prior to ip. */ + const uint8_t* base = ip; + size_t matched = min_match + FindMatchLengthWithLimit( + candidate + min_match, ip + min_match, + (size_t)(ip_end - ip) - min_match); + ip += matched; + last_distance = (int)(base - candidate); /* > 0 */ + BROTLI_DCHECK(0 == memcmp(base, candidate, matched)); + EmitCopyLen(matched, commands); + EmitDistance((uint32_t)last_distance, commands); + + next_emit = ip; + if (BROTLI_PREDICT_FALSE(ip >= ip_limit)) { + goto emit_remainder; + } + { + /* We could immediately start working at ip now, but to improve + compression we first update "table" with the hashes of some + positions within the last copy. */ + uint64_t input_bytes; + uint32_t cur_hash; + uint32_t prev_hash; + if (min_match == 4) { + input_bytes = BROTLI_UNALIGNED_LOAD64LE(ip - 3); + cur_hash = HashBytesAtOffset(input_bytes, 3, shift, min_match); + prev_hash = HashBytesAtOffset(input_bytes, 0, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 3); + prev_hash = HashBytesAtOffset(input_bytes, 1, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 2); + prev_hash = HashBytesAtOffset(input_bytes, 2, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 1); + } else { + input_bytes = BROTLI_UNALIGNED_LOAD64LE(ip - 5); + prev_hash = HashBytesAtOffset(input_bytes, 0, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 5); + prev_hash = HashBytesAtOffset(input_bytes, 1, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 4); + prev_hash = HashBytesAtOffset(input_bytes, 2, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 3); + input_bytes = BROTLI_UNALIGNED_LOAD64LE(ip - 2); + cur_hash = HashBytesAtOffset(input_bytes, 2, shift, min_match); + prev_hash = HashBytesAtOffset(input_bytes, 0, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 2); + prev_hash = HashBytesAtOffset(input_bytes, 1, shift, min_match); + table[prev_hash] = (int)(ip - base_ip - 1); + } + + candidate = base_ip + table[cur_hash]; + table[cur_hash] = (int)(ip - base_ip); + } + } + + next_hash = Hash(++ip, shift, min_match); + } + } + +emit_remainder: + BROTLI_DCHECK(next_emit <= ip_end); + /* Emit the remaining bytes as literals. */ + if (next_emit < ip_end) { + const uint32_t insert = (uint32_t)(ip_end - next_emit); + EmitInsertLen(insert, commands); + memcpy(*literals, next_emit, insert); + *literals += insert; + } +} + +static void StoreCommands(MemoryManager* m, + const uint8_t* literals, const size_t num_literals, + const uint32_t* commands, const size_t num_commands, + size_t* storage_ix, uint8_t* storage) { + static const uint32_t kNumExtraBits[128] = { + 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 7, 8, 9, 10, 12, 14, 24, + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 7, 8, 9, 10, 24, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, + 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, + 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, + }; + static const uint32_t kInsertOffset[24] = { + 0, 1, 2, 3, 4, 5, 6, 8, 10, 14, 18, 26, 34, 50, 66, 98, 130, 194, 322, 578, + 1090, 2114, 6210, 22594, + }; + + uint8_t lit_depths[256]; + uint16_t lit_bits[256]; + uint32_t lit_histo[256] = { 0 }; + uint8_t cmd_depths[128] = { 0 }; + uint16_t cmd_bits[128] = { 0 }; + uint32_t cmd_histo[128] = { 0 }; + size_t i; + for (i = 0; i < num_literals; ++i) { + ++lit_histo[literals[i]]; + } + BrotliBuildAndStoreHuffmanTreeFast(m, lit_histo, num_literals, + /* max_bits = */ 8, + lit_depths, lit_bits, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + + for (i = 0; i < num_commands; ++i) { + const uint32_t code = commands[i] & 0xFF; + BROTLI_DCHECK(code < 128); + ++cmd_histo[code]; + } + cmd_histo[1] += 1; + cmd_histo[2] += 1; + cmd_histo[64] += 1; + cmd_histo[84] += 1; + BuildAndStoreCommandPrefixCode(cmd_histo, cmd_depths, cmd_bits, + storage_ix, storage); + + for (i = 0; i < num_commands; ++i) { + const uint32_t cmd = commands[i]; + const uint32_t code = cmd & 0xFF; + const uint32_t extra = cmd >> 8; + BROTLI_DCHECK(code < 128); + BrotliWriteBits(cmd_depths[code], cmd_bits[code], storage_ix, storage); + BrotliWriteBits(kNumExtraBits[code], extra, storage_ix, storage); + if (code < 24) { + const uint32_t insert = kInsertOffset[code] + extra; + uint32_t j; + for (j = 0; j < insert; ++j) { + const uint8_t lit = *literals; + BrotliWriteBits(lit_depths[lit], lit_bits[lit], storage_ix, storage); + ++literals; + } + } + } +} + +/* Acceptable loss for uncompressible speedup is 2% */ +#define MIN_RATIO 0.98 +#define SAMPLE_RATE 43 + +static BROTLI_BOOL ShouldCompress( + const uint8_t* input, size_t input_size, size_t num_literals) { + double corpus_size = (double)input_size; + if (num_literals < MIN_RATIO * corpus_size) { + return BROTLI_TRUE; + } else { + uint32_t literal_histo[256] = { 0 }; + const double max_total_bit_cost = corpus_size * 8 * MIN_RATIO / SAMPLE_RATE; + size_t i; + for (i = 0; i < input_size; i += SAMPLE_RATE) { + ++literal_histo[input[i]]; + } + return TO_BROTLI_BOOL(BitsEntropy(literal_histo, 256) < max_total_bit_cost); + } +} + +static void RewindBitPosition(const size_t new_storage_ix, + size_t* storage_ix, uint8_t* storage) { + const size_t bitpos = new_storage_ix & 7; + const size_t mask = (1u << bitpos) - 1; + storage[new_storage_ix >> 3] &= (uint8_t)mask; + *storage_ix = new_storage_ix; +} + +static void EmitUncompressedMetaBlock(const uint8_t* input, size_t input_size, + size_t* storage_ix, uint8_t* storage) { + BrotliStoreMetaBlockHeader(input_size, 1, storage_ix, storage); + *storage_ix = (*storage_ix + 7u) & ~7u; + memcpy(&storage[*storage_ix >> 3], input, input_size); + *storage_ix += input_size << 3; + storage[*storage_ix >> 3] = 0; +} + +static BROTLI_INLINE void BrotliCompressFragmentTwoPassImpl( + MemoryManager* m, const uint8_t* input, size_t input_size, + BROTLI_BOOL is_last, uint32_t* command_buf, uint8_t* literal_buf, + int* table, size_t table_bits, size_t min_match, + size_t* storage_ix, uint8_t* storage) { + /* Save the start of the first block for position and distance computations. + */ + const uint8_t* base_ip = input; + BROTLI_UNUSED(is_last); + + while (input_size > 0) { + size_t block_size = + BROTLI_MIN(size_t, input_size, kCompressFragmentTwoPassBlockSize); + uint32_t* commands = command_buf; + uint8_t* literals = literal_buf; + size_t num_literals; + CreateCommands(input, block_size, input_size, base_ip, table, + table_bits, min_match, &literals, &commands); + num_literals = (size_t)(literals - literal_buf); + if (ShouldCompress(input, block_size, num_literals)) { + const size_t num_commands = (size_t)(commands - command_buf); + BrotliStoreMetaBlockHeader(block_size, 0, storage_ix, storage); + /* No block splits, no contexts. */ + BrotliWriteBits(13, 0, storage_ix, storage); + StoreCommands(m, literal_buf, num_literals, command_buf, num_commands, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + } else { + /* Since we did not find many backward references and the entropy of + the data is close to 8 bits, we can simply emit an uncompressed block. + This makes compression speed of uncompressible data about 3x faster. */ + EmitUncompressedMetaBlock(input, block_size, storage_ix, storage); + } + input += block_size; + input_size -= block_size; + } +} + +#define FOR_TABLE_BITS_(X) \ + X(8) X(9) X(10) X(11) X(12) X(13) X(14) X(15) X(16) X(17) + +#define BAKE_METHOD_PARAM_(B) \ +static BROTLI_NOINLINE void BrotliCompressFragmentTwoPassImpl ## B( \ + MemoryManager* m, const uint8_t* input, size_t input_size, \ + BROTLI_BOOL is_last, uint32_t* command_buf, uint8_t* literal_buf, \ + int* table, size_t* storage_ix, uint8_t* storage) { \ + size_t min_match = (B <= 15) ? 4 : 6; \ + BrotliCompressFragmentTwoPassImpl(m, input, input_size, is_last, command_buf,\ + literal_buf, table, B, min_match, storage_ix, storage); \ +} +FOR_TABLE_BITS_(BAKE_METHOD_PARAM_) +#undef BAKE_METHOD_PARAM_ + +void BrotliCompressFragmentTwoPass( + MemoryManager* m, const uint8_t* input, size_t input_size, + BROTLI_BOOL is_last, uint32_t* command_buf, uint8_t* literal_buf, + int* table, size_t table_size, size_t* storage_ix, uint8_t* storage) { + const size_t initial_storage_ix = *storage_ix; + const size_t table_bits = Log2FloorNonZero(table_size); + switch (table_bits) { +#define CASE_(B) \ + case B: \ + BrotliCompressFragmentTwoPassImpl ## B( \ + m, input, input_size, is_last, command_buf, \ + literal_buf, table, storage_ix, storage); \ + break; + FOR_TABLE_BITS_(CASE_) +#undef CASE_ + default: BROTLI_DCHECK(0); break; + } + + /* If output is larger than single uncompressed block, rewrite it. */ + if (*storage_ix - initial_storage_ix > 31 + (input_size << 3)) { + RewindBitPosition(initial_storage_ix, storage_ix, storage); + EmitUncompressedMetaBlock(input, input_size, storage_ix, storage); + } + + if (is_last) { + BrotliWriteBits(1, 1, storage_ix, storage); /* islast */ + BrotliWriteBits(1, 1, storage_ix, storage); /* isempty */ + *storage_ix = (*storage_ix + 7u) & ~7u; + } +} + +#undef FOR_TABLE_BITS_ + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/compress_fragment_two_pass.h b/modules/brotli/enc/compress_fragment_two_pass.h new file mode 100644 index 000000000..928677df4 --- /dev/null +++ b/modules/brotli/enc/compress_fragment_two_pass.h @@ -0,0 +1,54 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function for fast encoding of an input fragment, independently from the input + history. This function uses two-pass processing: in the first pass we save + the found backward matches and literal bytes into a buffer, and in the + second pass we emit them into the bit stream using prefix codes built based + on the actual command and literal byte histograms. */ + +#ifndef BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ +#define BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ + +#include "../common/platform.h" +#include <brotli/types.h> +#include "./memory.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static const size_t kCompressFragmentTwoPassBlockSize = 1 << 17; + +/* Compresses "input" string to the "*storage" buffer as one or more complete + meta-blocks, and updates the "*storage_ix" bit position. + + If "is_last" is 1, emits an additional empty last meta-block. + + REQUIRES: "input_size" is greater than zero, or "is_last" is 1. + REQUIRES: "input_size" is less or equal to maximal metablock size (1 << 24). + REQUIRES: "command_buf" and "literal_buf" point to at least + kCompressFragmentTwoPassBlockSize long arrays. + REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero. + REQUIRES: "table_size" is a power of two + OUTPUT: maximal copy distance <= |input_size| + OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */ +BROTLI_INTERNAL void BrotliCompressFragmentTwoPass(MemoryManager* m, + const uint8_t* input, + size_t input_size, + BROTLI_BOOL is_last, + uint32_t* command_buf, + uint8_t* literal_buf, + int* table, + size_t table_size, + size_t* storage_ix, + uint8_t* storage); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ */ diff --git a/modules/brotli/enc/dictionary_hash.c b/modules/brotli/enc/dictionary_hash.c new file mode 100644 index 000000000..3677d7ddb --- /dev/null +++ b/modules/brotli/enc/dictionary_hash.c @@ -0,0 +1,1120 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Hash table on the 4-byte prefixes of static dictionary words. */ + +#include "../common/platform.h" +#include "./dictionary_hash.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +BROTLI_INTERNAL const uint16_t kStaticDictionaryHash[32768] = { +32072,0,0,0,0,0,0,0,0,21860,0,0,0,0,0,0,0,40486,0,0,0,0,0,45798,0,0,0,0,0,0,1292 +,0,0,0,0,4964,278,23717,0,19972,0,0,0,0,0,0,0,0,0,0,0,0,2126,16102,0,0,0,14437,0 +,0,0,0,0,0,0,26727,2253,0,0,17252,0,0,0,0,0,0,0,0,0,3622,0,0,0,0,22984,0,0,0,0,0 +,0,16647,0,34247,0,0,0,0,0,48486,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2511,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,19532,0,0,24004,0,0,0,9828,0 +,0,0,0,0,0,0,0,0,0,0,0,0,0,0,30853,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 +,0,0,0,0,0,0,0,0,0,0,31974,0,0,0,0,0,0,0,0,20650,2404,0,20773,1677,9031,0,6404,0 +,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,51879,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6761,7206 +,0,0,21992,22983,0,0,3529,0,1864,0,0,0,0,0,0,11046,0,0,9641,0,0,0,6507,0,0,36934 +,21576,62375,0,0,0,0,0,0,0,0,0,8294,0,0,0,0,0,0,0,40807,0,0,0,39398,8136,0,0,0,0 +,0,0,0,8875,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7941,0,0,25609,0,0,0,936, +3716,3213,15687,0,0,0,0,0,52519,0,17381,0,0,0,0,1320,5797,0,21029,0,0,6472,807,0 +,0,0,0,0,0,0,0,0,0,13545,0,0,0,3624,0,0,0,29674,30820,0,31237,0,6596,0,0,0,0,0,0 +,0,0,0,64070,0,0,0,0,0,0,0,0,0,0,0,22278,0,37446,0,0,0,0,7240,423,0,24612,21705, +17636,0,0,0,0,0,0,1833,0,0,0,328,6021,0,0,0,19974,0,0,0,0,0,0,0,0,0,62119,4178,0 +,0,0,0,12100,8617,0,0,16900,0,36678,0,0,0,35366,0,51718,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,20998,0,62086,0,0,0,0,0,5542,0,0,0,0,0,0,0,0,0,0,0,14629,10952,25927,0,0,0 +,0,19849,0,0,0,0,0,0,0,30952,3046,14314,12998,0,0,0,15268,0,40582,30216,62118,0, +0,0,20132,0,0,0,0,0,12005,0,0,0,52358,0,0,0,0,24778,0,44,33095,0,0,0,0,0,26372,0 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+12613,0,0,0,0,0,0,0,0,13993,0,0,0,16202,0,0,0,0,32102,0,37223,0,10500,0,0,0,0,0, +0,0,0,32008,0,0,0,0,0,23816,3236,0,0,0,0,0,23237,0,0,5642,0,4684,294,0,0,0,0,0,0 +,0,0,0,0,0,0,0,0,0,0,0,0,0,26852,0,0,0,0,0,0,7148,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,7890,61798,939,0,0,56679,0,0,0,0,0,27078,202,5029,0,0,0,0,0, +0,0,0,0,28005,0,0,15273,24741,5676,20452,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,55910,0,0 +,0,0,5069,27942,0,21092,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,12517,0,0,0,0,0,0, +0,0,0,0,0,0,21384,28260,0,2502,20108,0,0,0,0,0,0,0,0,0,0,0,0,46726,0,30790,0,0,0 +,0,0,14725,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1099,6372,0,0,0,12422,15182,0,8683,0, +10665,19462,0,0,0,0,0,0,1590,0,31628,0,22632,19750,0,0,0,0,0,0,0,24198,0,0,0,0,0 +,50662,0,0,0,0,0,0,0,0,0,0,9131,0,0,0,0,0,0,0,0,0,0,0,0,0,0,11015,0,0,0,0,0,0,0, +0,16490,54695,0,0,0,0,0,0,0,0,12937,0,0,0,0,16004,0,0,0,0,0,0,0,0,0,2181,6923,0, +0,0,0,0,0,0,15624,11302,0,0,5673,7559,0,0,14668,15684,0,0,0,0,0,0,24204,48134,0, +24230,0,55527,0,0,3464,19141,0,0,0,0}; + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/dictionary_hash.h b/modules/brotli/enc/dictionary_hash.h new file mode 100644 index 000000000..b3bb9599f --- /dev/null +++ b/modules/brotli/enc/dictionary_hash.h @@ -0,0 +1,24 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Hash table on the 4-byte prefixes of static dictionary words. */ + +#ifndef BROTLI_ENC_DICTIONARY_HASH_H_ +#define BROTLI_ENC_DICTIONARY_HASH_H_ + +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +extern const uint16_t kStaticDictionaryHash[32768]; + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_DICTIONARY_HASH_H_ */ diff --git a/modules/brotli/enc/encode.c b/modules/brotli/enc/encode.c new file mode 100644 index 000000000..141e70aa2 --- /dev/null +++ b/modules/brotli/enc/encode.c @@ -0,0 +1,1862 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Implementation of Brotli compressor. */ + +#include <brotli/encode.h> + +#include <stdlib.h> /* free, malloc */ +#include <string.h> /* memcpy, memset */ + +#include "../common/constants.h" +#include "../common/context.h" +#include "../common/platform.h" +#include "../common/version.h" +#include "./backward_references.h" +#include "./backward_references_hq.h" +#include "./bit_cost.h" +#include "./brotli_bit_stream.h" +#include "./compress_fragment.h" +#include "./compress_fragment_two_pass.h" +#include "./encoder_dict.h" +#include "./entropy_encode.h" +#include "./fast_log.h" +#include "./hash.h" +#include "./histogram.h" +#include "./memory.h" +#include "./metablock.h" +#include "./prefix.h" +#include "./quality.h" +#include "./ringbuffer.h" +#include "./utf8_util.h" +#include "./write_bits.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define COPY_ARRAY(dst, src) memcpy(dst, src, sizeof(src)); + +typedef enum BrotliEncoderStreamState { + /* Default state. */ + BROTLI_STREAM_PROCESSING = 0, + /* Intermediate state; after next block is emitted, byte-padding should be + performed before getting back to default state. */ + BROTLI_STREAM_FLUSH_REQUESTED = 1, + /* Last metablock was produced; no more input is acceptable. */ + BROTLI_STREAM_FINISHED = 2, + /* Flushing compressed block and writing meta-data block header. */ + BROTLI_STREAM_METADATA_HEAD = 3, + /* Writing metadata block body. */ + BROTLI_STREAM_METADATA_BODY = 4 +} BrotliEncoderStreamState; + +typedef struct BrotliEncoderStateStruct { + BrotliEncoderParams params; + + MemoryManager memory_manager_; + + HasherHandle hasher_; + uint64_t input_pos_; + RingBuffer ringbuffer_; + size_t cmd_alloc_size_; + Command* commands_; + size_t num_commands_; + size_t num_literals_; + size_t last_insert_len_; + uint64_t last_flush_pos_; + uint64_t last_processed_pos_; + int dist_cache_[BROTLI_NUM_DISTANCE_SHORT_CODES]; + int saved_dist_cache_[4]; + uint16_t last_bytes_; + uint8_t last_bytes_bits_; + uint8_t prev_byte_; + uint8_t prev_byte2_; + size_t storage_size_; + uint8_t* storage_; + /* Hash table for FAST_ONE_PASS_COMPRESSION_QUALITY mode. */ + int small_table_[1 << 10]; /* 4KiB */ + int* large_table_; /* Allocated only when needed */ + size_t large_table_size_; + /* Command and distance prefix codes (each 64 symbols, stored back-to-back) + used for the next block in FAST_ONE_PASS_COMPRESSION_QUALITY. The command + prefix code is over a smaller alphabet with the following 64 symbols: + 0 - 15: insert length code 0, copy length code 0 - 15, same distance + 16 - 39: insert length code 0, copy length code 0 - 23 + 40 - 63: insert length code 0 - 23, copy length code 0 + Note that symbols 16 and 40 represent the same code in the full alphabet, + but we do not use either of them in FAST_ONE_PASS_COMPRESSION_QUALITY. */ + uint8_t cmd_depths_[128]; + uint16_t cmd_bits_[128]; + /* The compressed form of the command and distance prefix codes for the next + block in FAST_ONE_PASS_COMPRESSION_QUALITY. */ + uint8_t cmd_code_[512]; + size_t cmd_code_numbits_; + /* Command and literal buffers for FAST_TWO_PASS_COMPRESSION_QUALITY. */ + uint32_t* command_buf_; + uint8_t* literal_buf_; + + uint8_t* next_out_; + size_t available_out_; + size_t total_out_; + /* Temporary buffer for padding flush bits or metadata block header / body. */ + union { + uint64_t u64[2]; + uint8_t u8[16]; + } tiny_buf_; + uint32_t remaining_metadata_bytes_; + BrotliEncoderStreamState stream_state_; + + BROTLI_BOOL is_last_block_emitted_; + BROTLI_BOOL is_initialized_; +} BrotliEncoderStateStruct; + +static BROTLI_BOOL EnsureInitialized(BrotliEncoderState* s); + +static size_t InputBlockSize(BrotliEncoderState* s) { + return (size_t)1 << s->params.lgblock; +} + +static uint64_t UnprocessedInputSize(BrotliEncoderState* s) { + return s->input_pos_ - s->last_processed_pos_; +} + +static size_t RemainingInputBlockSize(BrotliEncoderState* s) { + const uint64_t delta = UnprocessedInputSize(s); + size_t block_size = InputBlockSize(s); + if (delta >= block_size) return 0; + return block_size - (size_t)delta; +} + +BROTLI_BOOL BrotliEncoderSetParameter( + BrotliEncoderState* state, BrotliEncoderParameter p, uint32_t value) { + /* Changing parameters on the fly is not implemented yet. */ + if (state->is_initialized_) return BROTLI_FALSE; + /* TODO: Validate/clamp parameters here. */ + switch (p) { + case BROTLI_PARAM_MODE: + state->params.mode = (BrotliEncoderMode)value; + return BROTLI_TRUE; + + case BROTLI_PARAM_QUALITY: + state->params.quality = (int)value; + return BROTLI_TRUE; + + case BROTLI_PARAM_LGWIN: + state->params.lgwin = (int)value; + return BROTLI_TRUE; + + case BROTLI_PARAM_LGBLOCK: + state->params.lgblock = (int)value; + return BROTLI_TRUE; + + case BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING: + if ((value != 0) && (value != 1)) return BROTLI_FALSE; + state->params.disable_literal_context_modeling = TO_BROTLI_BOOL(!!value); + return BROTLI_TRUE; + + case BROTLI_PARAM_SIZE_HINT: + state->params.size_hint = value; + return BROTLI_TRUE; + + case BROTLI_PARAM_LARGE_WINDOW: + state->params.large_window = TO_BROTLI_BOOL(!!value); + return BROTLI_TRUE; + + case BROTLI_PARAM_NPOSTFIX: + state->params.dist.distance_postfix_bits = value; + return BROTLI_TRUE; + + case BROTLI_PARAM_NDIRECT: + state->params.dist.num_direct_distance_codes = value; + return BROTLI_TRUE; + + default: return BROTLI_FALSE; + } +} + +/* Wraps 64-bit input position to 32-bit ring-buffer position preserving + "not-a-first-lap" feature. */ +static uint32_t WrapPosition(uint64_t position) { + uint32_t result = (uint32_t)position; + uint64_t gb = position >> 30; + if (gb > 2) { + /* Wrap every 2GiB; The first 3GB are continuous. */ + result = (result & ((1u << 30) - 1)) | ((uint32_t)((gb - 1) & 1) + 1) << 30; + } + return result; +} + +static uint8_t* GetBrotliStorage(BrotliEncoderState* s, size_t size) { + MemoryManager* m = &s->memory_manager_; + if (s->storage_size_ < size) { + BROTLI_FREE(m, s->storage_); + s->storage_ = BROTLI_ALLOC(m, uint8_t, size); + if (BROTLI_IS_OOM(m)) return NULL; + s->storage_size_ = size; + } + return s->storage_; +} + +static size_t HashTableSize(size_t max_table_size, size_t input_size) { + size_t htsize = 256; + while (htsize < max_table_size && htsize < input_size) { + htsize <<= 1; + } + return htsize; +} + +static int* GetHashTable(BrotliEncoderState* s, int quality, + size_t input_size, size_t* table_size) { + /* Use smaller hash table when input.size() is smaller, since we + fill the table, incurring O(hash table size) overhead for + compression, and if the input is short, we won't need that + many hash table entries anyway. */ + MemoryManager* m = &s->memory_manager_; + const size_t max_table_size = MaxHashTableSize(quality); + size_t htsize = HashTableSize(max_table_size, input_size); + int* table; + BROTLI_DCHECK(max_table_size >= 256); + if (quality == FAST_ONE_PASS_COMPRESSION_QUALITY) { + /* Only odd shifts are supported by fast-one-pass. */ + if ((htsize & 0xAAAAA) == 0) { + htsize <<= 1; + } + } + + if (htsize <= sizeof(s->small_table_) / sizeof(s->small_table_[0])) { + table = s->small_table_; + } else { + if (htsize > s->large_table_size_) { + s->large_table_size_ = htsize; + BROTLI_FREE(m, s->large_table_); + s->large_table_ = BROTLI_ALLOC(m, int, htsize); + if (BROTLI_IS_OOM(m)) return 0; + } + table = s->large_table_; + } + + *table_size = htsize; + memset(table, 0, htsize * sizeof(*table)); + return table; +} + +static void EncodeWindowBits(int lgwin, BROTLI_BOOL large_window, + uint16_t* last_bytes, uint8_t* last_bytes_bits) { + if (large_window) { + *last_bytes = (uint16_t)(((lgwin & 0x3F) << 8) | 0x11); + *last_bytes_bits = 14; + } else { + if (lgwin == 16) { + *last_bytes = 0; + *last_bytes_bits = 1; + } else if (lgwin == 17) { + *last_bytes = 1; + *last_bytes_bits = 7; + } else if (lgwin > 17) { + *last_bytes = (uint16_t)(((lgwin - 17) << 1) | 0x01); + *last_bytes_bits = 4; + } else { + *last_bytes = (uint16_t)(((lgwin - 8) << 4) | 0x01); + *last_bytes_bits = 7; + } + } +} + +/* Initializes the command and distance prefix codes for the first block. */ +static void InitCommandPrefixCodes(uint8_t cmd_depths[128], + uint16_t cmd_bits[128], + uint8_t cmd_code[512], + size_t* cmd_code_numbits) { + static const uint8_t kDefaultCommandDepths[128] = { + 0, 4, 4, 5, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, + 0, 0, 0, 4, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, + 7, 7, 10, 10, 10, 10, 10, 10, 0, 4, 4, 5, 5, 5, 6, 6, + 7, 8, 8, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, + 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, + 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 7, 7, 7, 8, 10, + 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, + }; + static const uint16_t kDefaultCommandBits[128] = { + 0, 0, 8, 9, 3, 35, 7, 71, + 39, 103, 23, 47, 175, 111, 239, 31, + 0, 0, 0, 4, 12, 2, 10, 6, + 13, 29, 11, 43, 27, 59, 87, 55, + 15, 79, 319, 831, 191, 703, 447, 959, + 0, 14, 1, 25, 5, 21, 19, 51, + 119, 159, 95, 223, 479, 991, 63, 575, + 127, 639, 383, 895, 255, 767, 511, 1023, + 14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 27, 59, 7, 39, 23, 55, 30, 1, 17, 9, 25, 5, 0, 8, 4, 12, + 2, 10, 6, 21, 13, 29, 3, 19, 11, 15, 47, 31, 95, 63, 127, 255, + 767, 2815, 1791, 3839, 511, 2559, 1535, 3583, 1023, 3071, 2047, 4095, + }; + static const uint8_t kDefaultCommandCode[] = { + 0xff, 0x77, 0xd5, 0xbf, 0xe7, 0xde, 0xea, 0x9e, 0x51, 0x5d, 0xde, 0xc6, + 0x70, 0x57, 0xbc, 0x58, 0x58, 0x58, 0xd8, 0xd8, 0x58, 0xd5, 0xcb, 0x8c, + 0xea, 0xe0, 0xc3, 0x87, 0x1f, 0x83, 0xc1, 0x60, 0x1c, 0x67, 0xb2, 0xaa, + 0x06, 0x83, 0xc1, 0x60, 0x30, 0x18, 0xcc, 0xa1, 0xce, 0x88, 0x54, 0x94, + 0x46, 0xe1, 0xb0, 0xd0, 0x4e, 0xb2, 0xf7, 0x04, 0x00, + }; + static const size_t kDefaultCommandCodeNumBits = 448; + COPY_ARRAY(cmd_depths, kDefaultCommandDepths); + COPY_ARRAY(cmd_bits, kDefaultCommandBits); + + /* Initialize the pre-compressed form of the command and distance prefix + codes. */ + COPY_ARRAY(cmd_code, kDefaultCommandCode); + *cmd_code_numbits = kDefaultCommandCodeNumBits; +} + +/* Decide about the context map based on the ability of the prediction + ability of the previous byte UTF8-prefix on the next byte. The + prediction ability is calculated as Shannon entropy. Here we need + Shannon entropy instead of 'BitsEntropy' since the prefix will be + encoded with the remaining 6 bits of the following byte, and + BitsEntropy will assume that symbol to be stored alone using Huffman + coding. */ +static void ChooseContextMap(int quality, + uint32_t* bigram_histo, + size_t* num_literal_contexts, + const uint32_t** literal_context_map) { + static const uint32_t kStaticContextMapContinuation[64] = { + 1, 1, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + }; + static const uint32_t kStaticContextMapSimpleUTF8[64] = { + 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + }; + + uint32_t monogram_histo[3] = { 0 }; + uint32_t two_prefix_histo[6] = { 0 }; + size_t total; + size_t i; + size_t dummy; + double entropy[4]; + for (i = 0; i < 9; ++i) { + monogram_histo[i % 3] += bigram_histo[i]; + two_prefix_histo[i % 6] += bigram_histo[i]; + } + entropy[1] = ShannonEntropy(monogram_histo, 3, &dummy); + entropy[2] = (ShannonEntropy(two_prefix_histo, 3, &dummy) + + ShannonEntropy(two_prefix_histo + 3, 3, &dummy)); + entropy[3] = 0; + for (i = 0; i < 3; ++i) { + entropy[3] += ShannonEntropy(bigram_histo + 3 * i, 3, &dummy); + } + + total = monogram_histo[0] + monogram_histo[1] + monogram_histo[2]; + BROTLI_DCHECK(total != 0); + entropy[0] = 1.0 / (double)total; + entropy[1] *= entropy[0]; + entropy[2] *= entropy[0]; + entropy[3] *= entropy[0]; + + if (quality < MIN_QUALITY_FOR_HQ_CONTEXT_MODELING) { + /* 3 context models is a bit slower, don't use it at lower qualities. */ + entropy[3] = entropy[1] * 10; + } + /* If expected savings by symbol are less than 0.2 bits, skip the + context modeling -- in exchange for faster decoding speed. */ + if (entropy[1] - entropy[2] < 0.2 && + entropy[1] - entropy[3] < 0.2) { + *num_literal_contexts = 1; + } else if (entropy[2] - entropy[3] < 0.02) { + *num_literal_contexts = 2; + *literal_context_map = kStaticContextMapSimpleUTF8; + } else { + *num_literal_contexts = 3; + *literal_context_map = kStaticContextMapContinuation; + } +} + +/* Decide if we want to use a more complex static context map containing 13 + context values, based on the entropy reduction of histograms over the + first 5 bits of literals. */ +static BROTLI_BOOL ShouldUseComplexStaticContextMap(const uint8_t* input, + size_t start_pos, size_t length, size_t mask, int quality, size_t size_hint, + size_t* num_literal_contexts, const uint32_t** literal_context_map) { + static const uint32_t kStaticContextMapComplexUTF8[64] = { + 11, 11, 12, 12, /* 0 special */ + 0, 0, 0, 0, /* 4 lf */ + 1, 1, 9, 9, /* 8 space */ + 2, 2, 2, 2, /* !, first after space/lf and after something else. */ + 1, 1, 1, 1, /* " */ + 8, 3, 3, 3, /* % */ + 1, 1, 1, 1, /* ({[ */ + 2, 2, 2, 2, /* }]) */ + 8, 4, 4, 4, /* :; */ + 8, 7, 4, 4, /* . */ + 8, 0, 0, 0, /* > */ + 3, 3, 3, 3, /* [0..9] */ + 5, 5, 10, 5, /* [A-Z] */ + 5, 5, 10, 5, + 6, 6, 6, 6, /* [a-z] */ + 6, 6, 6, 6, + }; + BROTLI_UNUSED(quality); + /* Try the more complex static context map only for long data. */ + if (size_hint < (1 << 20)) { + return BROTLI_FALSE; + } else { + const size_t end_pos = start_pos + length; + /* To make entropy calculations faster and to fit on the stack, we collect + histograms over the 5 most significant bits of literals. One histogram + without context and 13 additional histograms for each context value. */ + uint32_t combined_histo[32] = { 0 }; + uint32_t context_histo[13][32] = { { 0 } }; + uint32_t total = 0; + double entropy[3]; + size_t dummy; + size_t i; + ContextLut utf8_lut = BROTLI_CONTEXT_LUT(CONTEXT_UTF8); + for (; start_pos + 64 <= end_pos; start_pos += 4096) { + const size_t stride_end_pos = start_pos + 64; + uint8_t prev2 = input[start_pos & mask]; + uint8_t prev1 = input[(start_pos + 1) & mask]; + size_t pos; + /* To make the analysis of the data faster we only examine 64 byte long + strides at every 4kB intervals. */ + for (pos = start_pos + 2; pos < stride_end_pos; ++pos) { + const uint8_t literal = input[pos & mask]; + const uint8_t context = (uint8_t)kStaticContextMapComplexUTF8[ + BROTLI_CONTEXT(prev1, prev2, utf8_lut)]; + ++total; + ++combined_histo[literal >> 3]; + ++context_histo[context][literal >> 3]; + prev2 = prev1; + prev1 = literal; + } + } + entropy[1] = ShannonEntropy(combined_histo, 32, &dummy); + entropy[2] = 0; + for (i = 0; i < 13; ++i) { + entropy[2] += ShannonEntropy(&context_histo[i][0], 32, &dummy); + } + entropy[0] = 1.0 / (double)total; + entropy[1] *= entropy[0]; + entropy[2] *= entropy[0]; + /* The triggering heuristics below were tuned by compressing the individual + files of the silesia corpus. If we skip this kind of context modeling + for not very well compressible input (i.e. entropy using context modeling + is 60% of maximal entropy) or if expected savings by symbol are less + than 0.2 bits, then in every case when it triggers, the final compression + ratio is improved. Note however that this heuristics might be too strict + for some cases and could be tuned further. */ + if (entropy[2] > 3.0 || entropy[1] - entropy[2] < 0.2) { + return BROTLI_FALSE; + } else { + *num_literal_contexts = 13; + *literal_context_map = kStaticContextMapComplexUTF8; + return BROTLI_TRUE; + } + } +} + +static void DecideOverLiteralContextModeling(const uint8_t* input, + size_t start_pos, size_t length, size_t mask, int quality, size_t size_hint, + size_t* num_literal_contexts, const uint32_t** literal_context_map) { + if (quality < MIN_QUALITY_FOR_CONTEXT_MODELING || length < 64) { + return; + } else if (ShouldUseComplexStaticContextMap( + input, start_pos, length, mask, quality, size_hint, + num_literal_contexts, literal_context_map)) { + /* Context map was already set, nothing else to do. */ + } else { + /* Gather bi-gram data of the UTF8 byte prefixes. To make the analysis of + UTF8 data faster we only examine 64 byte long strides at every 4kB + intervals. */ + const size_t end_pos = start_pos + length; + uint32_t bigram_prefix_histo[9] = { 0 }; + for (; start_pos + 64 <= end_pos; start_pos += 4096) { + static const int lut[4] = { 0, 0, 1, 2 }; + const size_t stride_end_pos = start_pos + 64; + int prev = lut[input[start_pos & mask] >> 6] * 3; + size_t pos; + for (pos = start_pos + 1; pos < stride_end_pos; ++pos) { + const uint8_t literal = input[pos & mask]; + ++bigram_prefix_histo[prev + lut[literal >> 6]]; + prev = lut[literal >> 6] * 3; + } + } + ChooseContextMap(quality, &bigram_prefix_histo[0], num_literal_contexts, + literal_context_map); + } +} + +static BROTLI_BOOL ShouldCompress( + const uint8_t* data, const size_t mask, const uint64_t last_flush_pos, + const size_t bytes, const size_t num_literals, const size_t num_commands) { + /* TODO: find more precise minimal block overhead. */ + if (bytes <= 2) return BROTLI_FALSE; + if (num_commands < (bytes >> 8) + 2) { + if (num_literals > 0.99 * (double)bytes) { + uint32_t literal_histo[256] = { 0 }; + static const uint32_t kSampleRate = 13; + static const double kMinEntropy = 7.92; + const double bit_cost_threshold = + (double)bytes * kMinEntropy / kSampleRate; + size_t t = (bytes + kSampleRate - 1) / kSampleRate; + uint32_t pos = (uint32_t)last_flush_pos; + size_t i; + for (i = 0; i < t; i++) { + ++literal_histo[data[pos & mask]]; + pos += kSampleRate; + } + if (BitsEntropy(literal_histo, 256) > bit_cost_threshold) { + return BROTLI_FALSE; + } + } + } + return BROTLI_TRUE; +} + +/* Chooses the literal context mode for a metablock */ +static ContextType ChooseContextMode(const BrotliEncoderParams* params, + const uint8_t* data, const size_t pos, const size_t mask, + const size_t length) { + /* We only do the computation for the option of something else than + CONTEXT_UTF8 for the highest qualities */ + if (params->quality >= MIN_QUALITY_FOR_HQ_BLOCK_SPLITTING && + !BrotliIsMostlyUTF8(data, pos, mask, length, kMinUTF8Ratio)) { + return CONTEXT_SIGNED; + } + return CONTEXT_UTF8; +} + +static void WriteMetaBlockInternal(MemoryManager* m, + const uint8_t* data, + const size_t mask, + const uint64_t last_flush_pos, + const size_t bytes, + const BROTLI_BOOL is_last, + ContextType literal_context_mode, + const BrotliEncoderParams* params, + const uint8_t prev_byte, + const uint8_t prev_byte2, + const size_t num_literals, + const size_t num_commands, + Command* commands, + const int* saved_dist_cache, + int* dist_cache, + size_t* storage_ix, + uint8_t* storage) { + const uint32_t wrapped_last_flush_pos = WrapPosition(last_flush_pos); + uint16_t last_bytes; + uint8_t last_bytes_bits; + ContextLut literal_context_lut = BROTLI_CONTEXT_LUT(literal_context_mode); + BrotliEncoderParams block_params = *params; + + if (bytes == 0) { + /* Write the ISLAST and ISEMPTY bits. */ + BrotliWriteBits(2, 3, storage_ix, storage); + *storage_ix = (*storage_ix + 7u) & ~7u; + return; + } + + if (!ShouldCompress(data, mask, last_flush_pos, bytes, + num_literals, num_commands)) { + /* Restore the distance cache, as its last update by + CreateBackwardReferences is now unused. */ + memcpy(dist_cache, saved_dist_cache, 4 * sizeof(dist_cache[0])); + BrotliStoreUncompressedMetaBlock(is_last, data, + wrapped_last_flush_pos, mask, bytes, + storage_ix, storage); + return; + } + + BROTLI_DCHECK(*storage_ix <= 14); + last_bytes = (uint16_t)((storage[1] << 8) | storage[0]); + last_bytes_bits = (uint8_t)(*storage_ix); + if (params->quality <= MAX_QUALITY_FOR_STATIC_ENTROPY_CODES) { + BrotliStoreMetaBlockFast(m, data, wrapped_last_flush_pos, + bytes, mask, is_last, params, + commands, num_commands, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + } else if (params->quality < MIN_QUALITY_FOR_BLOCK_SPLIT) { + BrotliStoreMetaBlockTrivial(m, data, wrapped_last_flush_pos, + bytes, mask, is_last, params, + commands, num_commands, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + } else { + MetaBlockSplit mb; + InitMetaBlockSplit(&mb); + if (params->quality < MIN_QUALITY_FOR_HQ_BLOCK_SPLITTING) { + size_t num_literal_contexts = 1; + const uint32_t* literal_context_map = NULL; + if (!params->disable_literal_context_modeling) { + DecideOverLiteralContextModeling( + data, wrapped_last_flush_pos, bytes, mask, params->quality, + params->size_hint, &num_literal_contexts, + &literal_context_map); + } + BrotliBuildMetaBlockGreedy(m, data, wrapped_last_flush_pos, mask, + prev_byte, prev_byte2, literal_context_lut, num_literal_contexts, + literal_context_map, commands, num_commands, &mb); + if (BROTLI_IS_OOM(m)) return; + } else { + BrotliBuildMetaBlock(m, data, wrapped_last_flush_pos, mask, &block_params, + prev_byte, prev_byte2, + commands, num_commands, + literal_context_mode, + &mb); + if (BROTLI_IS_OOM(m)) return; + } + if (params->quality >= MIN_QUALITY_FOR_OPTIMIZE_HISTOGRAMS) { + /* The number of distance symbols effectively used for distance + histograms. It might be less than distance alphabet size + for "Large Window Brotli" (32-bit). */ + uint32_t num_effective_dist_codes = block_params.dist.alphabet_size; + if (num_effective_dist_codes > BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS) { + num_effective_dist_codes = BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS; + } + BrotliOptimizeHistograms(num_effective_dist_codes, &mb); + } + BrotliStoreMetaBlock(m, data, wrapped_last_flush_pos, bytes, mask, + prev_byte, prev_byte2, + is_last, + &block_params, + literal_context_mode, + commands, num_commands, + &mb, + storage_ix, storage); + if (BROTLI_IS_OOM(m)) return; + DestroyMetaBlockSplit(m, &mb); + } + if (bytes + 4 < (*storage_ix >> 3)) { + /* Restore the distance cache and last byte. */ + memcpy(dist_cache, saved_dist_cache, 4 * sizeof(dist_cache[0])); + storage[0] = (uint8_t)last_bytes; + storage[1] = (uint8_t)(last_bytes >> 8); + *storage_ix = last_bytes_bits; + BrotliStoreUncompressedMetaBlock(is_last, data, + wrapped_last_flush_pos, mask, + bytes, storage_ix, storage); + } +} + +static void ChooseDistanceParams(BrotliEncoderParams* params) { + uint32_t distance_postfix_bits = 0; + uint32_t num_direct_distance_codes = 0; + + if (params->quality >= MIN_QUALITY_FOR_NONZERO_DISTANCE_PARAMS) { + uint32_t ndirect_msb; + if (params->mode == BROTLI_MODE_FONT) { + distance_postfix_bits = 1; + num_direct_distance_codes = 12; + } else { + distance_postfix_bits = params->dist.distance_postfix_bits; + num_direct_distance_codes = params->dist.num_direct_distance_codes; + } + ndirect_msb = (num_direct_distance_codes >> distance_postfix_bits) & 0x0F; + if (distance_postfix_bits > BROTLI_MAX_NPOSTFIX || + num_direct_distance_codes > BROTLI_MAX_NDIRECT || + (ndirect_msb << distance_postfix_bits) != num_direct_distance_codes) { + distance_postfix_bits = 0; + num_direct_distance_codes = 0; + } + } + + BrotliInitDistanceParams( + params, distance_postfix_bits, num_direct_distance_codes); +} + +static BROTLI_BOOL EnsureInitialized(BrotliEncoderState* s) { + if (BROTLI_IS_OOM(&s->memory_manager_)) return BROTLI_FALSE; + if (s->is_initialized_) return BROTLI_TRUE; + + s->last_bytes_bits_ = 0; + s->last_bytes_ = 0; + s->remaining_metadata_bytes_ = BROTLI_UINT32_MAX; + + SanitizeParams(&s->params); + s->params.lgblock = ComputeLgBlock(&s->params); + ChooseDistanceParams(&s->params); + + RingBufferSetup(&s->params, &s->ringbuffer_); + + /* Initialize last byte with stream header. */ + { + int lgwin = s->params.lgwin; + if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY || + s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) { + lgwin = BROTLI_MAX(int, lgwin, 18); + } + EncodeWindowBits(lgwin, s->params.large_window, + &s->last_bytes_, &s->last_bytes_bits_); + } + + if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY) { + InitCommandPrefixCodes(s->cmd_depths_, s->cmd_bits_, + s->cmd_code_, &s->cmd_code_numbits_); + } + + s->is_initialized_ = BROTLI_TRUE; + return BROTLI_TRUE; +} + +static void BrotliEncoderInitParams(BrotliEncoderParams* params) { + params->mode = BROTLI_DEFAULT_MODE; + params->large_window = BROTLI_FALSE; + params->quality = BROTLI_DEFAULT_QUALITY; + params->lgwin = BROTLI_DEFAULT_WINDOW; + params->lgblock = 0; + params->size_hint = 0; + params->disable_literal_context_modeling = BROTLI_FALSE; + BrotliInitEncoderDictionary(¶ms->dictionary); + params->dist.distance_postfix_bits = 0; + params->dist.num_direct_distance_codes = 0; + params->dist.alphabet_size = + BROTLI_DISTANCE_ALPHABET_SIZE(0, 0, BROTLI_MAX_DISTANCE_BITS); + params->dist.max_distance = BROTLI_MAX_DISTANCE; +} + +static void BrotliEncoderInitState(BrotliEncoderState* s) { + BrotliEncoderInitParams(&s->params); + s->input_pos_ = 0; + s->num_commands_ = 0; + s->num_literals_ = 0; + s->last_insert_len_ = 0; + s->last_flush_pos_ = 0; + s->last_processed_pos_ = 0; + s->prev_byte_ = 0; + s->prev_byte2_ = 0; + s->storage_size_ = 0; + s->storage_ = 0; + s->hasher_ = NULL; + s->large_table_ = NULL; + s->large_table_size_ = 0; + s->cmd_code_numbits_ = 0; + s->command_buf_ = NULL; + s->literal_buf_ = NULL; + s->next_out_ = NULL; + s->available_out_ = 0; + s->total_out_ = 0; + s->stream_state_ = BROTLI_STREAM_PROCESSING; + s->is_last_block_emitted_ = BROTLI_FALSE; + s->is_initialized_ = BROTLI_FALSE; + + RingBufferInit(&s->ringbuffer_); + + s->commands_ = 0; + s->cmd_alloc_size_ = 0; + + /* Initialize distance cache. */ + s->dist_cache_[0] = 4; + s->dist_cache_[1] = 11; + s->dist_cache_[2] = 15; + s->dist_cache_[3] = 16; + /* Save the state of the distance cache in case we need to restore it for + emitting an uncompressed block. */ + memcpy(s->saved_dist_cache_, s->dist_cache_, sizeof(s->saved_dist_cache_)); +} + +BrotliEncoderState* BrotliEncoderCreateInstance( + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) { + BrotliEncoderState* state = 0; + if (!alloc_func && !free_func) { + state = (BrotliEncoderState*)malloc(sizeof(BrotliEncoderState)); + } else if (alloc_func && free_func) { + state = (BrotliEncoderState*)alloc_func(opaque, sizeof(BrotliEncoderState)); + } + if (state == 0) { + /* BROTLI_DUMP(); */ + return 0; + } + BrotliInitMemoryManager( + &state->memory_manager_, alloc_func, free_func, opaque); + BrotliEncoderInitState(state); + return state; +} + +static void BrotliEncoderCleanupState(BrotliEncoderState* s) { + MemoryManager* m = &s->memory_manager_; + if (BROTLI_IS_OOM(m)) { + BrotliWipeOutMemoryManager(m); + return; + } + BROTLI_FREE(m, s->storage_); + BROTLI_FREE(m, s->commands_); + RingBufferFree(m, &s->ringbuffer_); + DestroyHasher(m, &s->hasher_); + BROTLI_FREE(m, s->large_table_); + BROTLI_FREE(m, s->command_buf_); + BROTLI_FREE(m, s->literal_buf_); +} + +/* Deinitializes and frees BrotliEncoderState instance. */ +void BrotliEncoderDestroyInstance(BrotliEncoderState* state) { + if (!state) { + return; + } else { + MemoryManager* m = &state->memory_manager_; + brotli_free_func free_func = m->free_func; + void* opaque = m->opaque; + BrotliEncoderCleanupState(state); + free_func(opaque, state); + } +} + +/* + Copies the given input data to the internal ring buffer of the compressor. + No processing of the data occurs at this time and this function can be + called multiple times before calling WriteBrotliData() to process the + accumulated input. At most input_block_size() bytes of input data can be + copied to the ring buffer, otherwise the next WriteBrotliData() will fail. + */ +static void CopyInputToRingBuffer(BrotliEncoderState* s, + const size_t input_size, + const uint8_t* input_buffer) { + RingBuffer* ringbuffer_ = &s->ringbuffer_; + MemoryManager* m = &s->memory_manager_; + RingBufferWrite(m, input_buffer, input_size, ringbuffer_); + if (BROTLI_IS_OOM(m)) return; + s->input_pos_ += input_size; + + /* TL;DR: If needed, initialize 7 more bytes in the ring buffer to make the + hashing not depend on uninitialized data. This makes compression + deterministic and it prevents uninitialized memory warnings in Valgrind. + Even without erasing, the output would be valid (but nondeterministic). + + Background information: The compressor stores short (at most 8 bytes) + substrings of the input already read in a hash table, and detects + repetitions by looking up such substrings in the hash table. If it + can find a substring, it checks whether the substring is really there + in the ring buffer (or it's just a hash collision). Should the hash + table become corrupt, this check makes sure that the output is + still valid, albeit the compression ratio would be bad. + + The compressor populates the hash table from the ring buffer as it's + reading new bytes from the input. However, at the last few indexes of + the ring buffer, there are not enough bytes to build full-length + substrings from. Since the hash table always contains full-length + substrings, we erase with dummy zeros here to make sure that those + substrings will contain zeros at the end instead of uninitialized + data. + + Please note that erasing is not necessary (because the + memory region is already initialized since he ring buffer + has a `tail' that holds a copy of the beginning,) so we + skip erasing if we have already gone around at least once in + the ring buffer. + + Only clear during the first round of ring-buffer writes. On + subsequent rounds data in the ring-buffer would be affected. */ + if (ringbuffer_->pos_ <= ringbuffer_->mask_) { + /* This is the first time when the ring buffer is being written. + We clear 7 bytes just after the bytes that have been copied from + the input buffer. + + The ring-buffer has a "tail" that holds a copy of the beginning, + but only once the ring buffer has been fully written once, i.e., + pos <= mask. For the first time, we need to write values + in this tail (where index may be larger than mask), so that + we have exactly defined behavior and don't read uninitialized + memory. Due to performance reasons, hashing reads data using a + LOAD64, which can go 7 bytes beyond the bytes written in the + ring-buffer. */ + memset(ringbuffer_->buffer_ + ringbuffer_->pos_, 0, 7); + } +} + +/* Marks all input as processed. + Returns true if position wrapping occurs. */ +static BROTLI_BOOL UpdateLastProcessedPos(BrotliEncoderState* s) { + uint32_t wrapped_last_processed_pos = WrapPosition(s->last_processed_pos_); + uint32_t wrapped_input_pos = WrapPosition(s->input_pos_); + s->last_processed_pos_ = s->input_pos_; + return TO_BROTLI_BOOL(wrapped_input_pos < wrapped_last_processed_pos); +} + +static void ExtendLastCommand(BrotliEncoderState* s, uint32_t* bytes, + uint32_t* wrapped_last_processed_pos) { + Command* last_command = &s->commands_[s->num_commands_ - 1]; + const uint8_t* data = s->ringbuffer_.buffer_; + const uint32_t mask = s->ringbuffer_.mask_; + uint64_t max_backward_distance = + (((uint64_t)1) << s->params.lgwin) - BROTLI_WINDOW_GAP; + uint64_t last_copy_len = last_command->copy_len_ & 0x1FFFFFF; + uint64_t last_processed_pos = s->last_processed_pos_ - last_copy_len; + uint64_t max_distance = last_processed_pos < max_backward_distance ? + last_processed_pos : max_backward_distance; + uint64_t cmd_dist = (uint64_t)s->dist_cache_[0]; + uint32_t distance_code = CommandRestoreDistanceCode(last_command, + &s->params.dist); + if (distance_code < BROTLI_NUM_DISTANCE_SHORT_CODES || + distance_code - (BROTLI_NUM_DISTANCE_SHORT_CODES - 1) == cmd_dist) { + if (cmd_dist <= max_distance) { + while (*bytes != 0 && data[*wrapped_last_processed_pos & mask] == + data[(*wrapped_last_processed_pos - cmd_dist) & mask]) { + last_command->copy_len_++; + (*bytes)--; + (*wrapped_last_processed_pos)++; + } + } + /* The copy length is at most the metablock size, and thus expressible. */ + GetLengthCode(last_command->insert_len_, + (size_t)((int)(last_command->copy_len_ & 0x1FFFFFF) + + (int)(last_command->copy_len_ >> 25)), + TO_BROTLI_BOOL((last_command->dist_prefix_ & 0x3FF) == 0), + &last_command->cmd_prefix_); + } +} + +/* + Processes the accumulated input data and sets |*out_size| to the length of + the new output meta-block, or to zero if no new output meta-block has been + created (in this case the processed input data is buffered internally). + If |*out_size| is positive, |*output| points to the start of the output + data. If |is_last| or |force_flush| is BROTLI_TRUE, an output meta-block is + always created. However, until |is_last| is BROTLI_TRUE encoder may retain up + to 7 bits of the last byte of output. To force encoder to dump the remaining + bits use WriteMetadata() to append an empty meta-data block. + Returns BROTLI_FALSE if the size of the input data is larger than + input_block_size(). + */ +static BROTLI_BOOL EncodeData( + BrotliEncoderState* s, const BROTLI_BOOL is_last, + const BROTLI_BOOL force_flush, size_t* out_size, uint8_t** output) { + const uint64_t delta = UnprocessedInputSize(s); + uint32_t bytes = (uint32_t)delta; + uint32_t wrapped_last_processed_pos = WrapPosition(s->last_processed_pos_); + uint8_t* data; + uint32_t mask; + MemoryManager* m = &s->memory_manager_; + ContextType literal_context_mode; + + data = s->ringbuffer_.buffer_; + mask = s->ringbuffer_.mask_; + + /* Adding more blocks after "last" block is forbidden. */ + if (s->is_last_block_emitted_) return BROTLI_FALSE; + if (is_last) s->is_last_block_emitted_ = BROTLI_TRUE; + + if (delta > InputBlockSize(s)) { + return BROTLI_FALSE; + } + if (s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY && + !s->command_buf_) { + s->command_buf_ = + BROTLI_ALLOC(m, uint32_t, kCompressFragmentTwoPassBlockSize); + s->literal_buf_ = + BROTLI_ALLOC(m, uint8_t, kCompressFragmentTwoPassBlockSize); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } + + if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY || + s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) { + uint8_t* storage; + size_t storage_ix = s->last_bytes_bits_; + size_t table_size; + int* table; + + if (delta == 0 && !is_last) { + /* We have no new input data and we don't have to finish the stream, so + nothing to do. */ + *out_size = 0; + return BROTLI_TRUE; + } + storage = GetBrotliStorage(s, 2 * bytes + 503); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + storage[0] = (uint8_t)s->last_bytes_; + storage[1] = (uint8_t)(s->last_bytes_ >> 8); + table = GetHashTable(s, s->params.quality, bytes, &table_size); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY) { + BrotliCompressFragmentFast( + m, &data[wrapped_last_processed_pos & mask], + bytes, is_last, + table, table_size, + s->cmd_depths_, s->cmd_bits_, + &s->cmd_code_numbits_, s->cmd_code_, + &storage_ix, storage); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } else { + BrotliCompressFragmentTwoPass( + m, &data[wrapped_last_processed_pos & mask], + bytes, is_last, + s->command_buf_, s->literal_buf_, + table, table_size, + &storage_ix, storage); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } + s->last_bytes_ = (uint16_t)(storage[storage_ix >> 3]); + s->last_bytes_bits_ = storage_ix & 7u; + UpdateLastProcessedPos(s); + *output = &storage[0]; + *out_size = storage_ix >> 3; + return BROTLI_TRUE; + } + + { + /* Theoretical max number of commands is 1 per 2 bytes. */ + size_t newsize = s->num_commands_ + bytes / 2 + 1; + if (newsize > s->cmd_alloc_size_) { + Command* new_commands; + /* Reserve a bit more memory to allow merging with a next block + without reallocation: that would impact speed. */ + newsize += (bytes / 4) + 16; + s->cmd_alloc_size_ = newsize; + new_commands = BROTLI_ALLOC(m, Command, newsize); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + if (s->commands_) { + memcpy(new_commands, s->commands_, sizeof(Command) * s->num_commands_); + BROTLI_FREE(m, s->commands_); + } + s->commands_ = new_commands; + } + } + + InitOrStitchToPreviousBlock(m, &s->hasher_, data, mask, &s->params, + wrapped_last_processed_pos, bytes, is_last); + + literal_context_mode = ChooseContextMode( + &s->params, data, WrapPosition(s->last_flush_pos_), + mask, (size_t)(s->input_pos_ - s->last_flush_pos_)); + + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + + if (s->num_commands_ && s->last_insert_len_ == 0) { + ExtendLastCommand(s, &bytes, &wrapped_last_processed_pos); + } + + if (s->params.quality == ZOPFLIFICATION_QUALITY) { + BROTLI_DCHECK(s->params.hasher.type == 10); + BrotliCreateZopfliBackwardReferences(m, bytes, wrapped_last_processed_pos, + data, mask, &s->params, s->hasher_, s->dist_cache_, + &s->last_insert_len_, &s->commands_[s->num_commands_], + &s->num_commands_, &s->num_literals_); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } else if (s->params.quality == HQ_ZOPFLIFICATION_QUALITY) { + BROTLI_DCHECK(s->params.hasher.type == 10); + BrotliCreateHqZopfliBackwardReferences(m, bytes, wrapped_last_processed_pos, + data, mask, &s->params, s->hasher_, s->dist_cache_, + &s->last_insert_len_, &s->commands_[s->num_commands_], + &s->num_commands_, &s->num_literals_); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } else { + BrotliCreateBackwardReferences(bytes, wrapped_last_processed_pos, + data, mask, &s->params, s->hasher_, s->dist_cache_, + &s->last_insert_len_, &s->commands_[s->num_commands_], + &s->num_commands_, &s->num_literals_); + } + + { + const size_t max_length = MaxMetablockSize(&s->params); + const size_t max_literals = max_length / 8; + const size_t max_commands = max_length / 8; + const size_t processed_bytes = (size_t)(s->input_pos_ - s->last_flush_pos_); + /* If maximal possible additional block doesn't fit metablock, flush now. */ + /* TODO: Postpone decision until next block arrives? */ + const BROTLI_BOOL next_input_fits_metablock = TO_BROTLI_BOOL( + processed_bytes + InputBlockSize(s) <= max_length); + /* If block splitting is not used, then flush as soon as there is some + amount of commands / literals produced. */ + const BROTLI_BOOL should_flush = TO_BROTLI_BOOL( + s->params.quality < MIN_QUALITY_FOR_BLOCK_SPLIT && + s->num_literals_ + s->num_commands_ >= MAX_NUM_DELAYED_SYMBOLS); + if (!is_last && !force_flush && !should_flush && + next_input_fits_metablock && + s->num_literals_ < max_literals && + s->num_commands_ < max_commands) { + /* Merge with next input block. Everything will happen later. */ + if (UpdateLastProcessedPos(s)) { + HasherReset(s->hasher_); + } + *out_size = 0; + return BROTLI_TRUE; + } + } + + /* Create the last insert-only command. */ + if (s->last_insert_len_ > 0) { + InitInsertCommand(&s->commands_[s->num_commands_++], s->last_insert_len_); + s->num_literals_ += s->last_insert_len_; + s->last_insert_len_ = 0; + } + + if (!is_last && s->input_pos_ == s->last_flush_pos_) { + /* We have no new input data and we don't have to finish the stream, so + nothing to do. */ + *out_size = 0; + return BROTLI_TRUE; + } + BROTLI_DCHECK(s->input_pos_ >= s->last_flush_pos_); + BROTLI_DCHECK(s->input_pos_ > s->last_flush_pos_ || is_last); + BROTLI_DCHECK(s->input_pos_ - s->last_flush_pos_ <= 1u << 24); + { + const uint32_t metablock_size = + (uint32_t)(s->input_pos_ - s->last_flush_pos_); + uint8_t* storage = GetBrotliStorage(s, 2 * metablock_size + 503); + size_t storage_ix = s->last_bytes_bits_; + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + storage[0] = (uint8_t)s->last_bytes_; + storage[1] = (uint8_t)(s->last_bytes_ >> 8); + WriteMetaBlockInternal( + m, data, mask, s->last_flush_pos_, metablock_size, is_last, + literal_context_mode, &s->params, s->prev_byte_, s->prev_byte2_, + s->num_literals_, s->num_commands_, s->commands_, s->saved_dist_cache_, + s->dist_cache_, &storage_ix, storage); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + s->last_bytes_ = (uint16_t)(storage[storage_ix >> 3]); + s->last_bytes_bits_ = storage_ix & 7u; + s->last_flush_pos_ = s->input_pos_; + if (UpdateLastProcessedPos(s)) { + HasherReset(s->hasher_); + } + if (s->last_flush_pos_ > 0) { + s->prev_byte_ = data[((uint32_t)s->last_flush_pos_ - 1) & mask]; + } + if (s->last_flush_pos_ > 1) { + s->prev_byte2_ = data[(uint32_t)(s->last_flush_pos_ - 2) & mask]; + } + s->num_commands_ = 0; + s->num_literals_ = 0; + /* Save the state of the distance cache in case we need to restore it for + emitting an uncompressed block. */ + memcpy(s->saved_dist_cache_, s->dist_cache_, sizeof(s->saved_dist_cache_)); + *output = &storage[0]; + *out_size = storage_ix >> 3; + return BROTLI_TRUE; + } +} + +/* Dumps remaining output bits and metadata header to |header|. + Returns number of produced bytes. + REQUIRED: |header| should be 8-byte aligned and at least 16 bytes long. + REQUIRED: |block_size| <= (1 << 24). */ +static size_t WriteMetadataHeader( + BrotliEncoderState* s, const size_t block_size, uint8_t* header) { + size_t storage_ix; + storage_ix = s->last_bytes_bits_; + header[0] = (uint8_t)s->last_bytes_; + header[1] = (uint8_t)(s->last_bytes_ >> 8); + s->last_bytes_ = 0; + s->last_bytes_bits_ = 0; + + BrotliWriteBits(1, 0, &storage_ix, header); + BrotliWriteBits(2, 3, &storage_ix, header); + BrotliWriteBits(1, 0, &storage_ix, header); + if (block_size == 0) { + BrotliWriteBits(2, 0, &storage_ix, header); + } else { + uint32_t nbits = (block_size == 1) ? 0 : + (Log2FloorNonZero((uint32_t)block_size - 1) + 1); + uint32_t nbytes = (nbits + 7) / 8; + BrotliWriteBits(2, nbytes, &storage_ix, header); + BrotliWriteBits(8 * nbytes, block_size - 1, &storage_ix, header); + } + return (storage_ix + 7u) >> 3; +} + +static BROTLI_BOOL BrotliCompressBufferQuality10( + int lgwin, size_t input_size, const uint8_t* input_buffer, + size_t* encoded_size, uint8_t* encoded_buffer) { + MemoryManager memory_manager; + MemoryManager* m = &memory_manager; + + const size_t mask = BROTLI_SIZE_MAX >> 1; + int dist_cache[4] = { 4, 11, 15, 16 }; + int saved_dist_cache[4] = { 4, 11, 15, 16 }; + BROTLI_BOOL ok = BROTLI_TRUE; + const size_t max_out_size = *encoded_size; + size_t total_out_size = 0; + uint16_t last_bytes; + uint8_t last_bytes_bits; + HasherHandle hasher = NULL; + + const size_t hasher_eff_size = BROTLI_MIN(size_t, + input_size, BROTLI_MAX_BACKWARD_LIMIT(lgwin) + BROTLI_WINDOW_GAP); + + BrotliEncoderParams params; + + const int lgmetablock = BROTLI_MIN(int, 24, lgwin + 1); + size_t max_block_size; + const size_t max_metablock_size = (size_t)1 << lgmetablock; + const size_t max_literals_per_metablock = max_metablock_size / 8; + const size_t max_commands_per_metablock = max_metablock_size / 8; + size_t metablock_start = 0; + uint8_t prev_byte = 0; + uint8_t prev_byte2 = 0; + + BrotliEncoderInitParams(¶ms); + params.quality = 10; + params.lgwin = lgwin; + if (lgwin > BROTLI_MAX_WINDOW_BITS) { + params.large_window = BROTLI_TRUE; + } + SanitizeParams(¶ms); + params.lgblock = ComputeLgBlock(¶ms); + ChooseDistanceParams(¶ms); + max_block_size = (size_t)1 << params.lgblock; + + BrotliInitMemoryManager(m, 0, 0, 0); + + BROTLI_DCHECK(input_size <= mask + 1); + EncodeWindowBits(lgwin, params.large_window, &last_bytes, &last_bytes_bits); + InitOrStitchToPreviousBlock(m, &hasher, input_buffer, mask, ¶ms, + 0, hasher_eff_size, BROTLI_TRUE); + if (BROTLI_IS_OOM(m)) goto oom; + + while (ok && metablock_start < input_size) { + const size_t metablock_end = + BROTLI_MIN(size_t, input_size, metablock_start + max_metablock_size); + const size_t expected_num_commands = + (metablock_end - metablock_start) / 12 + 16; + Command* commands = 0; + size_t num_commands = 0; + size_t last_insert_len = 0; + size_t num_literals = 0; + size_t metablock_size = 0; + size_t cmd_alloc_size = 0; + BROTLI_BOOL is_last; + uint8_t* storage; + size_t storage_ix; + + ContextType literal_context_mode = ChooseContextMode(¶ms, + input_buffer, metablock_start, mask, metablock_end - metablock_start); + + size_t block_start; + for (block_start = metablock_start; block_start < metablock_end; ) { + size_t block_size = + BROTLI_MIN(size_t, metablock_end - block_start, max_block_size); + ZopfliNode* nodes = BROTLI_ALLOC(m, ZopfliNode, block_size + 1); + size_t path_size; + size_t new_cmd_alloc_size; + if (BROTLI_IS_OOM(m)) goto oom; + BrotliInitZopfliNodes(nodes, block_size + 1); + StitchToPreviousBlockH10(hasher, block_size, block_start, + input_buffer, mask); + path_size = BrotliZopfliComputeShortestPath(m, block_size, block_start, + input_buffer, mask, ¶ms, dist_cache, hasher, + nodes); + if (BROTLI_IS_OOM(m)) goto oom; + /* We allocate a command buffer in the first iteration of this loop that + will be likely big enough for the whole metablock, so that for most + inputs we will not have to reallocate in later iterations. We do the + allocation here and not before the loop, because if the input is small, + this will be allocated after the Zopfli cost model is freed, so this + will not increase peak memory usage. + TODO: If the first allocation is too small, increase command + buffer size exponentially. */ + new_cmd_alloc_size = BROTLI_MAX(size_t, expected_num_commands, + num_commands + path_size + 1); + if (cmd_alloc_size != new_cmd_alloc_size) { + Command* new_commands = BROTLI_ALLOC(m, Command, new_cmd_alloc_size); + if (BROTLI_IS_OOM(m)) goto oom; + cmd_alloc_size = new_cmd_alloc_size; + if (commands) { + memcpy(new_commands, commands, sizeof(Command) * num_commands); + BROTLI_FREE(m, commands); + } + commands = new_commands; + } + BrotliZopfliCreateCommands(block_size, block_start, &nodes[0], dist_cache, + &last_insert_len, ¶ms, &commands[num_commands], &num_literals); + num_commands += path_size; + block_start += block_size; + metablock_size += block_size; + BROTLI_FREE(m, nodes); + if (num_literals > max_literals_per_metablock || + num_commands > max_commands_per_metablock) { + break; + } + } + + if (last_insert_len > 0) { + InitInsertCommand(&commands[num_commands++], last_insert_len); + num_literals += last_insert_len; + } + + is_last = TO_BROTLI_BOOL(metablock_start + metablock_size == input_size); + storage = NULL; + storage_ix = last_bytes_bits; + + if (metablock_size == 0) { + /* Write the ISLAST and ISEMPTY bits. */ + storage = BROTLI_ALLOC(m, uint8_t, 16); + if (BROTLI_IS_OOM(m)) goto oom; + storage[0] = (uint8_t)last_bytes; + storage[1] = (uint8_t)(last_bytes >> 8); + BrotliWriteBits(2, 3, &storage_ix, storage); + storage_ix = (storage_ix + 7u) & ~7u; + } else if (!ShouldCompress(input_buffer, mask, metablock_start, + metablock_size, num_literals, num_commands)) { + /* Restore the distance cache, as its last update by + CreateBackwardReferences is now unused. */ + memcpy(dist_cache, saved_dist_cache, 4 * sizeof(dist_cache[0])); + storage = BROTLI_ALLOC(m, uint8_t, metablock_size + 16); + if (BROTLI_IS_OOM(m)) goto oom; + storage[0] = (uint8_t)last_bytes; + storage[1] = (uint8_t)(last_bytes >> 8); + BrotliStoreUncompressedMetaBlock(is_last, input_buffer, + metablock_start, mask, metablock_size, + &storage_ix, storage); + } else { + MetaBlockSplit mb; + BrotliEncoderParams block_params = params; + InitMetaBlockSplit(&mb); + BrotliBuildMetaBlock(m, input_buffer, metablock_start, mask, + &block_params, + prev_byte, prev_byte2, + commands, num_commands, + literal_context_mode, + &mb); + if (BROTLI_IS_OOM(m)) goto oom; + { + /* The number of distance symbols effectively used for distance + histograms. It might be less than distance alphabet size + for "Large Window Brotli" (32-bit). */ + uint32_t num_effective_dist_codes = block_params.dist.alphabet_size; + if (num_effective_dist_codes > BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS) { + num_effective_dist_codes = BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS; + } + BrotliOptimizeHistograms(num_effective_dist_codes, &mb); + } + storage = BROTLI_ALLOC(m, uint8_t, 2 * metablock_size + 503); + if (BROTLI_IS_OOM(m)) goto oom; + storage[0] = (uint8_t)last_bytes; + storage[1] = (uint8_t)(last_bytes >> 8); + BrotliStoreMetaBlock(m, input_buffer, metablock_start, metablock_size, + mask, prev_byte, prev_byte2, + is_last, + &block_params, + literal_context_mode, + commands, num_commands, + &mb, + &storage_ix, storage); + if (BROTLI_IS_OOM(m)) goto oom; + if (metablock_size + 4 < (storage_ix >> 3)) { + /* Restore the distance cache and last byte. */ + memcpy(dist_cache, saved_dist_cache, 4 * sizeof(dist_cache[0])); + storage[0] = (uint8_t)last_bytes; + storage[1] = (uint8_t)(last_bytes >> 8); + storage_ix = last_bytes_bits; + BrotliStoreUncompressedMetaBlock(is_last, input_buffer, + metablock_start, mask, + metablock_size, &storage_ix, storage); + } + DestroyMetaBlockSplit(m, &mb); + } + last_bytes = (uint16_t)(storage[storage_ix >> 3]); + last_bytes_bits = storage_ix & 7u; + metablock_start += metablock_size; + if (metablock_start < input_size) { + prev_byte = input_buffer[metablock_start - 1]; + prev_byte2 = input_buffer[metablock_start - 2]; + } + /* Save the state of the distance cache in case we need to restore it for + emitting an uncompressed block. */ + memcpy(saved_dist_cache, dist_cache, 4 * sizeof(dist_cache[0])); + + { + const size_t out_size = storage_ix >> 3; + total_out_size += out_size; + if (total_out_size <= max_out_size) { + memcpy(encoded_buffer, storage, out_size); + encoded_buffer += out_size; + } else { + ok = BROTLI_FALSE; + } + } + BROTLI_FREE(m, storage); + BROTLI_FREE(m, commands); + } + + *encoded_size = total_out_size; + DestroyHasher(m, &hasher); + return ok; + +oom: + BrotliWipeOutMemoryManager(m); + return BROTLI_FALSE; +} + +size_t BrotliEncoderMaxCompressedSize(size_t input_size) { + /* [window bits / empty metadata] + N * [uncompressed] + [last empty] */ + size_t num_large_blocks = input_size >> 14; + size_t overhead = 2 + (4 * num_large_blocks) + 3 + 1; + size_t result = input_size + overhead; + if (input_size == 0) return 2; + return (result < input_size) ? 0 : result; +} + +/* Wraps data to uncompressed brotli stream with minimal window size. + |output| should point at region with at least BrotliEncoderMaxCompressedSize + addressable bytes. + Returns the length of stream. */ +static size_t MakeUncompressedStream( + const uint8_t* input, size_t input_size, uint8_t* output) { + size_t size = input_size; + size_t result = 0; + size_t offset = 0; + if (input_size == 0) { + output[0] = 6; + return 1; + } + output[result++] = 0x21; /* window bits = 10, is_last = false */ + output[result++] = 0x03; /* empty metadata, padding */ + while (size > 0) { + uint32_t nibbles = 0; + uint32_t chunk_size; + uint32_t bits; + chunk_size = (size > (1u << 24)) ? (1u << 24) : (uint32_t)size; + if (chunk_size > (1u << 16)) nibbles = (chunk_size > (1u << 20)) ? 2 : 1; + bits = + (nibbles << 1) | ((chunk_size - 1) << 3) | (1u << (19 + 4 * nibbles)); + output[result++] = (uint8_t)bits; + output[result++] = (uint8_t)(bits >> 8); + output[result++] = (uint8_t)(bits >> 16); + if (nibbles == 2) output[result++] = (uint8_t)(bits >> 24); + memcpy(&output[result], &input[offset], chunk_size); + result += chunk_size; + offset += chunk_size; + size -= chunk_size; + } + output[result++] = 3; + return result; +} + +BROTLI_BOOL BrotliEncoderCompress( + int quality, int lgwin, BrotliEncoderMode mode, size_t input_size, + const uint8_t* input_buffer, size_t* encoded_size, + uint8_t* encoded_buffer) { + BrotliEncoderState* s; + size_t out_size = *encoded_size; + const uint8_t* input_start = input_buffer; + uint8_t* output_start = encoded_buffer; + size_t max_out_size = BrotliEncoderMaxCompressedSize(input_size); + if (out_size == 0) { + /* Output buffer needs at least one byte. */ + return BROTLI_FALSE; + } + if (input_size == 0) { + /* Handle the special case of empty input. */ + *encoded_size = 1; + *encoded_buffer = 6; + return BROTLI_TRUE; + } + if (quality == 10) { + /* TODO: Implement this direct path for all quality levels. */ + const int lg_win = BROTLI_MIN(int, BROTLI_LARGE_MAX_WINDOW_BITS, + BROTLI_MAX(int, 16, lgwin)); + int ok = BrotliCompressBufferQuality10(lg_win, input_size, input_buffer, + encoded_size, encoded_buffer); + if (!ok || (max_out_size && *encoded_size > max_out_size)) { + goto fallback; + } + return BROTLI_TRUE; + } + + s = BrotliEncoderCreateInstance(0, 0, 0); + if (!s) { + return BROTLI_FALSE; + } else { + size_t available_in = input_size; + const uint8_t* next_in = input_buffer; + size_t available_out = *encoded_size; + uint8_t* next_out = encoded_buffer; + size_t total_out = 0; + BROTLI_BOOL result = BROTLI_FALSE; + BrotliEncoderSetParameter(s, BROTLI_PARAM_QUALITY, (uint32_t)quality); + BrotliEncoderSetParameter(s, BROTLI_PARAM_LGWIN, (uint32_t)lgwin); + BrotliEncoderSetParameter(s, BROTLI_PARAM_MODE, (uint32_t)mode); + BrotliEncoderSetParameter(s, BROTLI_PARAM_SIZE_HINT, (uint32_t)input_size); + if (lgwin > BROTLI_MAX_WINDOW_BITS) { + BrotliEncoderSetParameter(s, BROTLI_PARAM_LARGE_WINDOW, BROTLI_TRUE); + } + result = BrotliEncoderCompressStream(s, BROTLI_OPERATION_FINISH, + &available_in, &next_in, &available_out, &next_out, &total_out); + if (!BrotliEncoderIsFinished(s)) result = 0; + *encoded_size = total_out; + BrotliEncoderDestroyInstance(s); + if (!result || (max_out_size && *encoded_size > max_out_size)) { + goto fallback; + } + return BROTLI_TRUE; + } +fallback: + *encoded_size = 0; + if (!max_out_size) return BROTLI_FALSE; + if (out_size >= max_out_size) { + *encoded_size = + MakeUncompressedStream(input_start, input_size, output_start); + return BROTLI_TRUE; + } + return BROTLI_FALSE; +} + +static void InjectBytePaddingBlock(BrotliEncoderState* s) { + uint32_t seal = s->last_bytes_; + size_t seal_bits = s->last_bytes_bits_; + uint8_t* destination; + s->last_bytes_ = 0; + s->last_bytes_bits_ = 0; + /* is_last = 0, data_nibbles = 11, reserved = 0, meta_nibbles = 00 */ + seal |= 0x6u << seal_bits; + seal_bits += 6; + /* If we have already created storage, then append to it. + Storage is valid until next block is being compressed. */ + if (s->next_out_) { + destination = s->next_out_ + s->available_out_; + } else { + destination = s->tiny_buf_.u8; + s->next_out_ = destination; + } + destination[0] = (uint8_t)seal; + if (seal_bits > 8) destination[1] = (uint8_t)(seal >> 8); + if (seal_bits > 16) destination[2] = (uint8_t)(seal >> 16); + s->available_out_ += (seal_bits + 7) >> 3; +} + +/* Injects padding bits or pushes compressed data to output. + Returns false if nothing is done. */ +static BROTLI_BOOL InjectFlushOrPushOutput(BrotliEncoderState* s, + size_t* available_out, uint8_t** next_out, size_t* total_out) { + if (s->stream_state_ == BROTLI_STREAM_FLUSH_REQUESTED && + s->last_bytes_bits_ != 0) { + InjectBytePaddingBlock(s); + return BROTLI_TRUE; + } + + if (s->available_out_ != 0 && *available_out != 0) { + size_t copy_output_size = + BROTLI_MIN(size_t, s->available_out_, *available_out); + memcpy(*next_out, s->next_out_, copy_output_size); + *next_out += copy_output_size; + *available_out -= copy_output_size; + s->next_out_ += copy_output_size; + s->available_out_ -= copy_output_size; + s->total_out_ += copy_output_size; + if (total_out) *total_out = s->total_out_; + return BROTLI_TRUE; + } + + return BROTLI_FALSE; +} + +static void CheckFlushComplete(BrotliEncoderState* s) { + if (s->stream_state_ == BROTLI_STREAM_FLUSH_REQUESTED && + s->available_out_ == 0) { + s->stream_state_ = BROTLI_STREAM_PROCESSING; + s->next_out_ = 0; + } +} + +static BROTLI_BOOL BrotliEncoderCompressStreamFast( + BrotliEncoderState* s, BrotliEncoderOperation op, size_t* available_in, + const uint8_t** next_in, size_t* available_out, uint8_t** next_out, + size_t* total_out) { + const size_t block_size_limit = (size_t)1 << s->params.lgwin; + const size_t buf_size = BROTLI_MIN(size_t, kCompressFragmentTwoPassBlockSize, + BROTLI_MIN(size_t, *available_in, block_size_limit)); + uint32_t* tmp_command_buf = NULL; + uint32_t* command_buf = NULL; + uint8_t* tmp_literal_buf = NULL; + uint8_t* literal_buf = NULL; + MemoryManager* m = &s->memory_manager_; + if (s->params.quality != FAST_ONE_PASS_COMPRESSION_QUALITY && + s->params.quality != FAST_TWO_PASS_COMPRESSION_QUALITY) { + return BROTLI_FALSE; + } + if (s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) { + if (!s->command_buf_ && buf_size == kCompressFragmentTwoPassBlockSize) { + s->command_buf_ = + BROTLI_ALLOC(m, uint32_t, kCompressFragmentTwoPassBlockSize); + s->literal_buf_ = + BROTLI_ALLOC(m, uint8_t, kCompressFragmentTwoPassBlockSize); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } + if (s->command_buf_) { + command_buf = s->command_buf_; + literal_buf = s->literal_buf_; + } else { + tmp_command_buf = BROTLI_ALLOC(m, uint32_t, buf_size); + tmp_literal_buf = BROTLI_ALLOC(m, uint8_t, buf_size); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + command_buf = tmp_command_buf; + literal_buf = tmp_literal_buf; + } + } + + while (BROTLI_TRUE) { + if (InjectFlushOrPushOutput(s, available_out, next_out, total_out)) { + continue; + } + + /* Compress block only when internal output buffer is empty, stream is not + finished, there is no pending flush request, and there is either + additional input or pending operation. */ + if (s->available_out_ == 0 && + s->stream_state_ == BROTLI_STREAM_PROCESSING && + (*available_in != 0 || op != BROTLI_OPERATION_PROCESS)) { + size_t block_size = BROTLI_MIN(size_t, block_size_limit, *available_in); + BROTLI_BOOL is_last = + (*available_in == block_size) && (op == BROTLI_OPERATION_FINISH); + BROTLI_BOOL force_flush = + (*available_in == block_size) && (op == BROTLI_OPERATION_FLUSH); + size_t max_out_size = 2 * block_size + 503; + BROTLI_BOOL inplace = BROTLI_TRUE; + uint8_t* storage = NULL; + size_t storage_ix = s->last_bytes_bits_; + size_t table_size; + int* table; + + if (force_flush && block_size == 0) { + s->stream_state_ = BROTLI_STREAM_FLUSH_REQUESTED; + continue; + } + if (max_out_size <= *available_out) { + storage = *next_out; + } else { + inplace = BROTLI_FALSE; + storage = GetBrotliStorage(s, max_out_size); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } + storage[0] = (uint8_t)s->last_bytes_; + storage[1] = (uint8_t)(s->last_bytes_ >> 8); + table = GetHashTable(s, s->params.quality, block_size, &table_size); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + + if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY) { + BrotliCompressFragmentFast(m, *next_in, block_size, is_last, table, + table_size, s->cmd_depths_, s->cmd_bits_, &s->cmd_code_numbits_, + s->cmd_code_, &storage_ix, storage); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } else { + BrotliCompressFragmentTwoPass(m, *next_in, block_size, is_last, + command_buf, literal_buf, table, table_size, + &storage_ix, storage); + if (BROTLI_IS_OOM(m)) return BROTLI_FALSE; + } + *next_in += block_size; + *available_in -= block_size; + if (inplace) { + size_t out_bytes = storage_ix >> 3; + BROTLI_DCHECK(out_bytes <= *available_out); + BROTLI_DCHECK((storage_ix & 7) == 0 || out_bytes < *available_out); + *next_out += out_bytes; + *available_out -= out_bytes; + s->total_out_ += out_bytes; + if (total_out) *total_out = s->total_out_; + } else { + size_t out_bytes = storage_ix >> 3; + s->next_out_ = storage; + s->available_out_ = out_bytes; + } + s->last_bytes_ = (uint16_t)(storage[storage_ix >> 3]); + s->last_bytes_bits_ = storage_ix & 7u; + + if (force_flush) s->stream_state_ = BROTLI_STREAM_FLUSH_REQUESTED; + if (is_last) s->stream_state_ = BROTLI_STREAM_FINISHED; + continue; + } + break; + } + BROTLI_FREE(m, tmp_command_buf); + BROTLI_FREE(m, tmp_literal_buf); + CheckFlushComplete(s); + return BROTLI_TRUE; +} + +static BROTLI_BOOL ProcessMetadata( + BrotliEncoderState* s, size_t* available_in, const uint8_t** next_in, + size_t* available_out, uint8_t** next_out, size_t* total_out) { + if (*available_in > (1u << 24)) return BROTLI_FALSE; + /* Switch to metadata block workflow, if required. */ + if (s->stream_state_ == BROTLI_STREAM_PROCESSING) { + s->remaining_metadata_bytes_ = (uint32_t)*available_in; + s->stream_state_ = BROTLI_STREAM_METADATA_HEAD; + } + if (s->stream_state_ != BROTLI_STREAM_METADATA_HEAD && + s->stream_state_ != BROTLI_STREAM_METADATA_BODY) { + return BROTLI_FALSE; + } + + while (BROTLI_TRUE) { + if (InjectFlushOrPushOutput(s, available_out, next_out, total_out)) { + continue; + } + if (s->available_out_ != 0) break; + + if (s->input_pos_ != s->last_flush_pos_) { + BROTLI_BOOL result = EncodeData(s, BROTLI_FALSE, BROTLI_TRUE, + &s->available_out_, &s->next_out_); + if (!result) return BROTLI_FALSE; + continue; + } + + if (s->stream_state_ == BROTLI_STREAM_METADATA_HEAD) { + s->next_out_ = s->tiny_buf_.u8; + s->available_out_ = + WriteMetadataHeader(s, s->remaining_metadata_bytes_, s->next_out_); + s->stream_state_ = BROTLI_STREAM_METADATA_BODY; + continue; + } else { + /* Exit workflow only when there is no more input and no more output. + Otherwise client may continue producing empty metadata blocks. */ + if (s->remaining_metadata_bytes_ == 0) { + s->remaining_metadata_bytes_ = BROTLI_UINT32_MAX; + s->stream_state_ = BROTLI_STREAM_PROCESSING; + break; + } + if (*available_out) { + /* Directly copy input to output. */ + uint32_t copy = (uint32_t)BROTLI_MIN( + size_t, s->remaining_metadata_bytes_, *available_out); + memcpy(*next_out, *next_in, copy); + *next_in += copy; + *available_in -= copy; + s->remaining_metadata_bytes_ -= copy; + *next_out += copy; + *available_out -= copy; + } else { + /* This guarantees progress in "TakeOutput" workflow. */ + uint32_t copy = BROTLI_MIN(uint32_t, s->remaining_metadata_bytes_, 16); + s->next_out_ = s->tiny_buf_.u8; + memcpy(s->next_out_, *next_in, copy); + *next_in += copy; + *available_in -= copy; + s->remaining_metadata_bytes_ -= copy; + s->available_out_ = copy; + } + continue; + } + } + + return BROTLI_TRUE; +} + +static void UpdateSizeHint(BrotliEncoderState* s, size_t available_in) { + if (s->params.size_hint == 0) { + uint64_t delta = UnprocessedInputSize(s); + uint64_t tail = available_in; + uint32_t limit = 1u << 30; + uint32_t total; + if ((delta >= limit) || (tail >= limit) || ((delta + tail) >= limit)) { + total = limit; + } else { + total = (uint32_t)(delta + tail); + } + s->params.size_hint = total; + } +} + +BROTLI_BOOL BrotliEncoderCompressStream( + BrotliEncoderState* s, BrotliEncoderOperation op, size_t* available_in, + const uint8_t** next_in, size_t* available_out,uint8_t** next_out, + size_t* total_out) { + if (!EnsureInitialized(s)) return BROTLI_FALSE; + + /* Unfinished metadata block; check requirements. */ + if (s->remaining_metadata_bytes_ != BROTLI_UINT32_MAX) { + if (*available_in != s->remaining_metadata_bytes_) return BROTLI_FALSE; + if (op != BROTLI_OPERATION_EMIT_METADATA) return BROTLI_FALSE; + } + + if (op == BROTLI_OPERATION_EMIT_METADATA) { + UpdateSizeHint(s, 0); /* First data metablock might be emitted here. */ + return ProcessMetadata( + s, available_in, next_in, available_out, next_out, total_out); + } + + if (s->stream_state_ == BROTLI_STREAM_METADATA_HEAD || + s->stream_state_ == BROTLI_STREAM_METADATA_BODY) { + return BROTLI_FALSE; + } + + if (s->stream_state_ != BROTLI_STREAM_PROCESSING && *available_in != 0) { + return BROTLI_FALSE; + } + if (s->params.quality == FAST_ONE_PASS_COMPRESSION_QUALITY || + s->params.quality == FAST_TWO_PASS_COMPRESSION_QUALITY) { + return BrotliEncoderCompressStreamFast(s, op, available_in, next_in, + available_out, next_out, total_out); + } + while (BROTLI_TRUE) { + size_t remaining_block_size = RemainingInputBlockSize(s); + + if (remaining_block_size != 0 && *available_in != 0) { + size_t copy_input_size = + BROTLI_MIN(size_t, remaining_block_size, *available_in); + CopyInputToRingBuffer(s, copy_input_size, *next_in); + *next_in += copy_input_size; + *available_in -= copy_input_size; + continue; + } + + if (InjectFlushOrPushOutput(s, available_out, next_out, total_out)) { + continue; + } + + /* Compress data only when internal output buffer is empty, stream is not + finished and there is no pending flush request. */ + if (s->available_out_ == 0 && + s->stream_state_ == BROTLI_STREAM_PROCESSING) { + if (remaining_block_size == 0 || op != BROTLI_OPERATION_PROCESS) { + BROTLI_BOOL is_last = TO_BROTLI_BOOL( + (*available_in == 0) && op == BROTLI_OPERATION_FINISH); + BROTLI_BOOL force_flush = TO_BROTLI_BOOL( + (*available_in == 0) && op == BROTLI_OPERATION_FLUSH); + BROTLI_BOOL result; + UpdateSizeHint(s, *available_in); + result = EncodeData(s, is_last, force_flush, + &s->available_out_, &s->next_out_); + if (!result) return BROTLI_FALSE; + if (force_flush) s->stream_state_ = BROTLI_STREAM_FLUSH_REQUESTED; + if (is_last) s->stream_state_ = BROTLI_STREAM_FINISHED; + continue; + } + } + break; + } + CheckFlushComplete(s); + return BROTLI_TRUE; +} + +BROTLI_BOOL BrotliEncoderIsFinished(BrotliEncoderState* s) { + return TO_BROTLI_BOOL(s->stream_state_ == BROTLI_STREAM_FINISHED && + !BrotliEncoderHasMoreOutput(s)); +} + +BROTLI_BOOL BrotliEncoderHasMoreOutput(BrotliEncoderState* s) { + return TO_BROTLI_BOOL(s->available_out_ != 0); +} + +const uint8_t* BrotliEncoderTakeOutput(BrotliEncoderState* s, size_t* size) { + size_t consumed_size = s->available_out_; + uint8_t* result = s->next_out_; + if (*size) { + consumed_size = BROTLI_MIN(size_t, *size, s->available_out_); + } + if (consumed_size) { + s->next_out_ += consumed_size; + s->available_out_ -= consumed_size; + s->total_out_ += consumed_size; + CheckFlushComplete(s); + *size = consumed_size; + } else { + *size = 0; + result = 0; + } + return result; +} + +uint32_t BrotliEncoderVersion(void) { + return BROTLI_VERSION; +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/encoder_dict.c b/modules/brotli/enc/encoder_dict.c new file mode 100644 index 000000000..8b2f6ad4a --- /dev/null +++ b/modules/brotli/enc/encoder_dict.c @@ -0,0 +1,32 @@ +/* Copyright 2017 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#include "./encoder_dict.h" + +#include "../common/dictionary.h" +#include "../common/transform.h" +#include "./dictionary_hash.h" +#include "./hash.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +void BrotliInitEncoderDictionary(BrotliEncoderDictionary* dict) { + dict->words = BrotliGetDictionary(); + + dict->hash_table = kStaticDictionaryHash; + dict->buckets = kStaticDictionaryBuckets; + dict->dict_words = kStaticDictionaryWords; + + dict->cutoffTransformsCount = kCutoffTransformsCount; + dict->cutoffTransforms = kCutoffTransforms; + +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/encoder_dict.h b/modules/brotli/enc/encoder_dict.h new file mode 100644 index 000000000..3cb6b0ac1 --- /dev/null +++ b/modules/brotli/enc/encoder_dict.h @@ -0,0 +1,41 @@ +/* Copyright 2017 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#ifndef BROTLI_ENC_ENCODER_DICT_H_ +#define BROTLI_ENC_ENCODER_DICT_H_ + +#include "../common/dictionary.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./static_dict_lut.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* Dictionary data (words and transforms) for 1 possible context */ +typedef struct BrotliEncoderDictionary { + const BrotliDictionary* words; + + /* cut off for fast encoder */ + uint32_t cutoffTransformsCount; + uint64_t cutoffTransforms; + + /* from dictionary_hash.h, for fast encoder */ + const uint16_t* hash_table; + + /* from static_dict_lut.h, for slow encoder */ + const uint16_t* buckets; + const DictWord* dict_words; +} BrotliEncoderDictionary; + +BROTLI_INTERNAL void BrotliInitEncoderDictionary(BrotliEncoderDictionary* dict); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_ENCODER_DICT_H_ */ diff --git a/modules/brotli/enc/entropy_encode.c b/modules/brotli/enc/entropy_encode.c new file mode 100644 index 000000000..97f9dfb82 --- /dev/null +++ b/modules/brotli/enc/entropy_encode.c @@ -0,0 +1,501 @@ +/* Copyright 2010 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Entropy encoding (Huffman) utilities. */ + +#include "./entropy_encode.h" + +#include <string.h> /* memset */ + +#include "../common/constants.h" +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +BROTLI_BOOL BrotliSetDepth( + int p0, HuffmanTree* pool, uint8_t* depth, int max_depth) { + int stack[16]; + int level = 0; + int p = p0; + BROTLI_DCHECK(max_depth <= 15); + stack[0] = -1; + while (BROTLI_TRUE) { + if (pool[p].index_left_ >= 0) { + level++; + if (level > max_depth) return BROTLI_FALSE; + stack[level] = pool[p].index_right_or_value_; + p = pool[p].index_left_; + continue; + } else { + depth[pool[p].index_right_or_value_] = (uint8_t)level; + } + while (level >= 0 && stack[level] == -1) level--; + if (level < 0) return BROTLI_TRUE; + p = stack[level]; + stack[level] = -1; + } +} + +/* Sort the root nodes, least popular first. */ +static BROTLI_INLINE BROTLI_BOOL SortHuffmanTree( + const HuffmanTree* v0, const HuffmanTree* v1) { + if (v0->total_count_ != v1->total_count_) { + return TO_BROTLI_BOOL(v0->total_count_ < v1->total_count_); + } + return TO_BROTLI_BOOL(v0->index_right_or_value_ > v1->index_right_or_value_); +} + +/* This function will create a Huffman tree. + + The catch here is that the tree cannot be arbitrarily deep. + Brotli specifies a maximum depth of 15 bits for "code trees" + and 7 bits for "code length code trees." + + count_limit is the value that is to be faked as the minimum value + and this minimum value is raised until the tree matches the + maximum length requirement. + + This algorithm is not of excellent performance for very long data blocks, + especially when population counts are longer than 2**tree_limit, but + we are not planning to use this with extremely long blocks. + + See http://en.wikipedia.org/wiki/Huffman_coding */ +void BrotliCreateHuffmanTree(const uint32_t* data, + const size_t length, + const int tree_limit, + HuffmanTree* tree, + uint8_t* depth) { + uint32_t count_limit; + HuffmanTree sentinel; + InitHuffmanTree(&sentinel, BROTLI_UINT32_MAX, -1, -1); + /* For block sizes below 64 kB, we never need to do a second iteration + of this loop. Probably all of our block sizes will be smaller than + that, so this loop is mostly of academic interest. If we actually + would need this, we would be better off with the Katajainen algorithm. */ + for (count_limit = 1; ; count_limit *= 2) { + size_t n = 0; + size_t i; + size_t j; + size_t k; + for (i = length; i != 0;) { + --i; + if (data[i]) { + const uint32_t count = BROTLI_MAX(uint32_t, data[i], count_limit); + InitHuffmanTree(&tree[n++], count, -1, (int16_t)i); + } + } + + if (n == 1) { + depth[tree[0].index_right_or_value_] = 1; /* Only one element. */ + break; + } + + SortHuffmanTreeItems(tree, n, SortHuffmanTree); + + /* The nodes are: + [0, n): the sorted leaf nodes that we start with. + [n]: we add a sentinel here. + [n + 1, 2n): new parent nodes are added here, starting from + (n+1). These are naturally in ascending order. + [2n]: we add a sentinel at the end as well. + There will be (2n+1) elements at the end. */ + tree[n] = sentinel; + tree[n + 1] = sentinel; + + i = 0; /* Points to the next leaf node. */ + j = n + 1; /* Points to the next non-leaf node. */ + for (k = n - 1; k != 0; --k) { + size_t left, right; + if (tree[i].total_count_ <= tree[j].total_count_) { + left = i; + ++i; + } else { + left = j; + ++j; + } + if (tree[i].total_count_ <= tree[j].total_count_) { + right = i; + ++i; + } else { + right = j; + ++j; + } + + { + /* The sentinel node becomes the parent node. */ + size_t j_end = 2 * n - k; + tree[j_end].total_count_ = + tree[left].total_count_ + tree[right].total_count_; + tree[j_end].index_left_ = (int16_t)left; + tree[j_end].index_right_or_value_ = (int16_t)right; + + /* Add back the last sentinel node. */ + tree[j_end + 1] = sentinel; + } + } + if (BrotliSetDepth((int)(2 * n - 1), &tree[0], depth, tree_limit)) { + /* We need to pack the Huffman tree in tree_limit bits. If this was not + successful, add fake entities to the lowest values and retry. */ + break; + } + } +} + +static void Reverse(uint8_t* v, size_t start, size_t end) { + --end; + while (start < end) { + uint8_t tmp = v[start]; + v[start] = v[end]; + v[end] = tmp; + ++start; + --end; + } +} + +static void BrotliWriteHuffmanTreeRepetitions( + const uint8_t previous_value, + const uint8_t value, + size_t repetitions, + size_t* tree_size, + uint8_t* tree, + uint8_t* extra_bits_data) { + BROTLI_DCHECK(repetitions > 0); + if (previous_value != value) { + tree[*tree_size] = value; + extra_bits_data[*tree_size] = 0; + ++(*tree_size); + --repetitions; + } + if (repetitions == 7) { + tree[*tree_size] = value; + extra_bits_data[*tree_size] = 0; + ++(*tree_size); + --repetitions; + } + if (repetitions < 3) { + size_t i; + for (i = 0; i < repetitions; ++i) { + tree[*tree_size] = value; + extra_bits_data[*tree_size] = 0; + ++(*tree_size); + } + } else { + size_t start = *tree_size; + repetitions -= 3; + while (BROTLI_TRUE) { + tree[*tree_size] = BROTLI_REPEAT_PREVIOUS_CODE_LENGTH; + extra_bits_data[*tree_size] = repetitions & 0x3; + ++(*tree_size); + repetitions >>= 2; + if (repetitions == 0) { + break; + } + --repetitions; + } + Reverse(tree, start, *tree_size); + Reverse(extra_bits_data, start, *tree_size); + } +} + +static void BrotliWriteHuffmanTreeRepetitionsZeros( + size_t repetitions, + size_t* tree_size, + uint8_t* tree, + uint8_t* extra_bits_data) { + if (repetitions == 11) { + tree[*tree_size] = 0; + extra_bits_data[*tree_size] = 0; + ++(*tree_size); + --repetitions; + } + if (repetitions < 3) { + size_t i; + for (i = 0; i < repetitions; ++i) { + tree[*tree_size] = 0; + extra_bits_data[*tree_size] = 0; + ++(*tree_size); + } + } else { + size_t start = *tree_size; + repetitions -= 3; + while (BROTLI_TRUE) { + tree[*tree_size] = BROTLI_REPEAT_ZERO_CODE_LENGTH; + extra_bits_data[*tree_size] = repetitions & 0x7; + ++(*tree_size); + repetitions >>= 3; + if (repetitions == 0) { + break; + } + --repetitions; + } + Reverse(tree, start, *tree_size); + Reverse(extra_bits_data, start, *tree_size); + } +} + +void BrotliOptimizeHuffmanCountsForRle(size_t length, uint32_t* counts, + uint8_t* good_for_rle) { + size_t nonzero_count = 0; + size_t stride; + size_t limit; + size_t sum; + const size_t streak_limit = 1240; + /* Let's make the Huffman code more compatible with RLE encoding. */ + size_t i; + for (i = 0; i < length; i++) { + if (counts[i]) { + ++nonzero_count; + } + } + if (nonzero_count < 16) { + return; + } + while (length != 0 && counts[length - 1] == 0) { + --length; + } + if (length == 0) { + return; /* All zeros. */ + } + /* Now counts[0..length - 1] does not have trailing zeros. */ + { + size_t nonzeros = 0; + uint32_t smallest_nonzero = 1 << 30; + for (i = 0; i < length; ++i) { + if (counts[i] != 0) { + ++nonzeros; + if (smallest_nonzero > counts[i]) { + smallest_nonzero = counts[i]; + } + } + } + if (nonzeros < 5) { + /* Small histogram will model it well. */ + return; + } + if (smallest_nonzero < 4) { + size_t zeros = length - nonzeros; + if (zeros < 6) { + for (i = 1; i < length - 1; ++i) { + if (counts[i - 1] != 0 && counts[i] == 0 && counts[i + 1] != 0) { + counts[i] = 1; + } + } + } + } + if (nonzeros < 28) { + return; + } + } + /* 2) Let's mark all population counts that already can be encoded + with an RLE code. */ + memset(good_for_rle, 0, length); + { + /* Let's not spoil any of the existing good RLE codes. + Mark any seq of 0's that is longer as 5 as a good_for_rle. + Mark any seq of non-0's that is longer as 7 as a good_for_rle. */ + uint32_t symbol = counts[0]; + size_t step = 0; + for (i = 0; i <= length; ++i) { + if (i == length || counts[i] != symbol) { + if ((symbol == 0 && step >= 5) || + (symbol != 0 && step >= 7)) { + size_t k; + for (k = 0; k < step; ++k) { + good_for_rle[i - k - 1] = 1; + } + } + step = 1; + if (i != length) { + symbol = counts[i]; + } + } else { + ++step; + } + } + } + /* 3) Let's replace those population counts that lead to more RLE codes. + Math here is in 24.8 fixed point representation. */ + stride = 0; + limit = 256 * (counts[0] + counts[1] + counts[2]) / 3 + 420; + sum = 0; + for (i = 0; i <= length; ++i) { + if (i == length || good_for_rle[i] || + (i != 0 && good_for_rle[i - 1]) || + (256 * counts[i] - limit + streak_limit) >= 2 * streak_limit) { + if (stride >= 4 || (stride >= 3 && sum == 0)) { + size_t k; + /* The stride must end, collapse what we have, if we have enough (4). */ + size_t count = (sum + stride / 2) / stride; + if (count == 0) { + count = 1; + } + if (sum == 0) { + /* Don't make an all zeros stride to be upgraded to ones. */ + count = 0; + } + for (k = 0; k < stride; ++k) { + /* We don't want to change value at counts[i], + that is already belonging to the next stride. Thus - 1. */ + counts[i - k - 1] = (uint32_t)count; + } + } + stride = 0; + sum = 0; + if (i < length - 2) { + /* All interesting strides have a count of at least 4, */ + /* at least when non-zeros. */ + limit = 256 * (counts[i] + counts[i + 1] + counts[i + 2]) / 3 + 420; + } else if (i < length) { + limit = 256 * counts[i]; + } else { + limit = 0; + } + } + ++stride; + if (i != length) { + sum += counts[i]; + if (stride >= 4) { + limit = (256 * sum + stride / 2) / stride; + } + if (stride == 4) { + limit += 120; + } + } + } +} + +static void DecideOverRleUse(const uint8_t* depth, const size_t length, + BROTLI_BOOL* use_rle_for_non_zero, + BROTLI_BOOL* use_rle_for_zero) { + size_t total_reps_zero = 0; + size_t total_reps_non_zero = 0; + size_t count_reps_zero = 1; + size_t count_reps_non_zero = 1; + size_t i; + for (i = 0; i < length;) { + const uint8_t value = depth[i]; + size_t reps = 1; + size_t k; + for (k = i + 1; k < length && depth[k] == value; ++k) { + ++reps; + } + if (reps >= 3 && value == 0) { + total_reps_zero += reps; + ++count_reps_zero; + } + if (reps >= 4 && value != 0) { + total_reps_non_zero += reps; + ++count_reps_non_zero; + } + i += reps; + } + *use_rle_for_non_zero = + TO_BROTLI_BOOL(total_reps_non_zero > count_reps_non_zero * 2); + *use_rle_for_zero = TO_BROTLI_BOOL(total_reps_zero > count_reps_zero * 2); +} + +void BrotliWriteHuffmanTree(const uint8_t* depth, + size_t length, + size_t* tree_size, + uint8_t* tree, + uint8_t* extra_bits_data) { + uint8_t previous_value = BROTLI_INITIAL_REPEATED_CODE_LENGTH; + size_t i; + BROTLI_BOOL use_rle_for_non_zero = BROTLI_FALSE; + BROTLI_BOOL use_rle_for_zero = BROTLI_FALSE; + + /* Throw away trailing zeros. */ + size_t new_length = length; + for (i = 0; i < length; ++i) { + if (depth[length - i - 1] == 0) { + --new_length; + } else { + break; + } + } + + /* First gather statistics on if it is a good idea to do RLE. */ + if (length > 50) { + /* Find RLE coding for longer codes. + Shorter codes seem not to benefit from RLE. */ + DecideOverRleUse(depth, new_length, + &use_rle_for_non_zero, &use_rle_for_zero); + } + + /* Actual RLE coding. */ + for (i = 0; i < new_length;) { + const uint8_t value = depth[i]; + size_t reps = 1; + if ((value != 0 && use_rle_for_non_zero) || + (value == 0 && use_rle_for_zero)) { + size_t k; + for (k = i + 1; k < new_length && depth[k] == value; ++k) { + ++reps; + } + } + if (value == 0) { + BrotliWriteHuffmanTreeRepetitionsZeros( + reps, tree_size, tree, extra_bits_data); + } else { + BrotliWriteHuffmanTreeRepetitions(previous_value, + value, reps, tree_size, + tree, extra_bits_data); + previous_value = value; + } + i += reps; + } +} + +static uint16_t BrotliReverseBits(size_t num_bits, uint16_t bits) { + static const size_t kLut[16] = { /* Pre-reversed 4-bit values. */ + 0x00, 0x08, 0x04, 0x0C, 0x02, 0x0A, 0x06, 0x0E, + 0x01, 0x09, 0x05, 0x0D, 0x03, 0x0B, 0x07, 0x0F + }; + size_t retval = kLut[bits & 0x0F]; + size_t i; + for (i = 4; i < num_bits; i += 4) { + retval <<= 4; + bits = (uint16_t)(bits >> 4); + retval |= kLut[bits & 0x0F]; + } + retval >>= ((0 - num_bits) & 0x03); + return (uint16_t)retval; +} + +/* 0..15 are values for bits */ +#define MAX_HUFFMAN_BITS 16 + +void BrotliConvertBitDepthsToSymbols(const uint8_t* depth, + size_t len, + uint16_t* bits) { + /* In Brotli, all bit depths are [1..15] + 0 bit depth means that the symbol does not exist. */ + uint16_t bl_count[MAX_HUFFMAN_BITS] = { 0 }; + uint16_t next_code[MAX_HUFFMAN_BITS]; + size_t i; + int code = 0; + for (i = 0; i < len; ++i) { + ++bl_count[depth[i]]; + } + bl_count[0] = 0; + next_code[0] = 0; + for (i = 1; i < MAX_HUFFMAN_BITS; ++i) { + code = (code + bl_count[i - 1]) << 1; + next_code[i] = (uint16_t)code; + } + for (i = 0; i < len; ++i) { + if (depth[i]) { + bits[i] = BrotliReverseBits(depth[i], next_code[depth[i]]++); + } + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/entropy_encode.h b/modules/brotli/enc/entropy_encode.h new file mode 100644 index 000000000..f23d9c379 --- /dev/null +++ b/modules/brotli/enc/entropy_encode.h @@ -0,0 +1,122 @@ +/* Copyright 2010 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Entropy encoding (Huffman) utilities. */ + +#ifndef BROTLI_ENC_ENTROPY_ENCODE_H_ +#define BROTLI_ENC_ENTROPY_ENCODE_H_ + +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* A node of a Huffman tree. */ +typedef struct HuffmanTree { + uint32_t total_count_; + int16_t index_left_; + int16_t index_right_or_value_; +} HuffmanTree; + +static BROTLI_INLINE void InitHuffmanTree(HuffmanTree* self, uint32_t count, + int16_t left, int16_t right) { + self->total_count_ = count; + self->index_left_ = left; + self->index_right_or_value_ = right; +} + +/* Returns 1 is assignment of depths succeeded, otherwise 0. */ +BROTLI_INTERNAL BROTLI_BOOL BrotliSetDepth( + int p, HuffmanTree* pool, uint8_t* depth, int max_depth); + +/* This function will create a Huffman tree. + + The (data,length) contains the population counts. + The tree_limit is the maximum bit depth of the Huffman codes. + + The depth contains the tree, i.e., how many bits are used for + the symbol. + + The actual Huffman tree is constructed in the tree[] array, which has to + be at least 2 * length + 1 long. + + See http://en.wikipedia.org/wiki/Huffman_coding */ +BROTLI_INTERNAL void BrotliCreateHuffmanTree(const uint32_t* data, + const size_t length, + const int tree_limit, + HuffmanTree* tree, + uint8_t* depth); + +/* Change the population counts in a way that the consequent + Huffman tree compression, especially its RLE-part will be more + likely to compress this data more efficiently. + + length contains the size of the histogram. + counts contains the population counts. + good_for_rle is a buffer of at least length size */ +BROTLI_INTERNAL void BrotliOptimizeHuffmanCountsForRle( + size_t length, uint32_t* counts, uint8_t* good_for_rle); + +/* Write a Huffman tree from bit depths into the bit-stream representation + of a Huffman tree. The generated Huffman tree is to be compressed once + more using a Huffman tree */ +BROTLI_INTERNAL void BrotliWriteHuffmanTree(const uint8_t* depth, + size_t num, + size_t* tree_size, + uint8_t* tree, + uint8_t* extra_bits_data); + +/* Get the actual bit values for a tree of bit depths. */ +BROTLI_INTERNAL void BrotliConvertBitDepthsToSymbols(const uint8_t* depth, + size_t len, + uint16_t* bits); + +/* Input size optimized Shell sort. */ +typedef BROTLI_BOOL (*HuffmanTreeComparator)( + const HuffmanTree*, const HuffmanTree*); +static BROTLI_INLINE void SortHuffmanTreeItems(HuffmanTree* items, + const size_t n, HuffmanTreeComparator comparator) { + static const size_t gaps[] = {132, 57, 23, 10, 4, 1}; + if (n < 13) { + /* Insertion sort. */ + size_t i; + for (i = 1; i < n; ++i) { + HuffmanTree tmp = items[i]; + size_t k = i; + size_t j = i - 1; + while (comparator(&tmp, &items[j])) { + items[k] = items[j]; + k = j; + if (!j--) break; + } + items[k] = tmp; + } + return; + } else { + /* Shell sort. */ + int g = n < 57 ? 2 : 0; + for (; g < 6; ++g) { + size_t gap = gaps[g]; + size_t i; + for (i = gap; i < n; ++i) { + size_t j = i; + HuffmanTree tmp = items[i]; + for (; j >= gap && comparator(&tmp, &items[j - gap]); j -= gap) { + items[j] = items[j - gap]; + } + items[j] = tmp; + } + } + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_ENTROPY_ENCODE_H_ */ diff --git a/modules/brotli/enc/entropy_encode_static.h b/modules/brotli/enc/entropy_encode_static.h new file mode 100644 index 000000000..62b99a954 --- /dev/null +++ b/modules/brotli/enc/entropy_encode_static.h @@ -0,0 +1,539 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Static entropy codes used for faster meta-block encoding. */ + +#ifndef BROTLI_ENC_ENTROPY_ENCODE_STATIC_H_ +#define BROTLI_ENC_ENTROPY_ENCODE_STATIC_H_ + +#include "../common/constants.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./write_bits.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static const uint8_t kCodeLengthDepth[18] = { + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 0, 4, 4, +}; + +static const uint8_t kStaticCommandCodeDepth[BROTLI_NUM_COMMAND_SYMBOLS] = { + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, + 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, +}; + +static const uint8_t kStaticDistanceCodeDepth[64] = { + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, +}; + +static const uint32_t kCodeLengthBits[18] = { + 0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 15, 31, 0, 11, 7, +}; + +static BROTLI_INLINE void StoreStaticCodeLengthCode( + size_t* storage_ix, uint8_t* storage) { + BrotliWriteBits( + 40, BROTLI_MAKE_UINT64_T(0x0000FFu, 0x55555554u), storage_ix, storage); +} + +static const uint64_t kZeroRepsBits[BROTLI_NUM_COMMAND_SYMBOLS] = { + 0x00000000, 0x00000000, 0x00000000, 0x00000007, 0x00000017, 0x00000027, + 0x00000037, 0x00000047, 0x00000057, 0x00000067, 0x00000077, 0x00000770, + 0x00000b87, 0x00001387, 0x00001b87, 0x00002387, 0x00002b87, 0x00003387, + 0x00003b87, 0x00000397, 0x00000b97, 0x00001397, 0x00001b97, 0x00002397, + 0x00002b97, 0x00003397, 0x00003b97, 0x000003a7, 0x00000ba7, 0x000013a7, + 0x00001ba7, 0x000023a7, 0x00002ba7, 0x000033a7, 0x00003ba7, 0x000003b7, + 0x00000bb7, 0x000013b7, 0x00001bb7, 0x000023b7, 0x00002bb7, 0x000033b7, + 0x00003bb7, 0x000003c7, 0x00000bc7, 0x000013c7, 0x00001bc7, 0x000023c7, + 0x00002bc7, 0x000033c7, 0x00003bc7, 0x000003d7, 0x00000bd7, 0x000013d7, + 0x00001bd7, 0x000023d7, 0x00002bd7, 0x000033d7, 0x00003bd7, 0x000003e7, + 0x00000be7, 0x000013e7, 0x00001be7, 0x000023e7, 0x00002be7, 0x000033e7, + 0x00003be7, 0x000003f7, 0x00000bf7, 0x000013f7, 0x00001bf7, 0x000023f7, + 0x00002bf7, 0x000033f7, 0x00003bf7, 0x0001c387, 0x0005c387, 0x0009c387, + 0x000dc387, 0x0011c387, 0x0015c387, 0x0019c387, 0x001dc387, 0x0001cb87, + 0x0005cb87, 0x0009cb87, 0x000dcb87, 0x0011cb87, 0x0015cb87, 0x0019cb87, + 0x001dcb87, 0x0001d387, 0x0005d387, 0x0009d387, 0x000dd387, 0x0011d387, + 0x0015d387, 0x0019d387, 0x001dd387, 0x0001db87, 0x0005db87, 0x0009db87, + 0x000ddb87, 0x0011db87, 0x0015db87, 0x0019db87, 0x001ddb87, 0x0001e387, + 0x0005e387, 0x0009e387, 0x000de387, 0x0011e387, 0x0015e387, 0x0019e387, + 0x001de387, 0x0001eb87, 0x0005eb87, 0x0009eb87, 0x000deb87, 0x0011eb87, + 0x0015eb87, 0x0019eb87, 0x001deb87, 0x0001f387, 0x0005f387, 0x0009f387, + 0x000df387, 0x0011f387, 0x0015f387, 0x0019f387, 0x001df387, 0x0001fb87, + 0x0005fb87, 0x0009fb87, 0x000dfb87, 0x0011fb87, 0x0015fb87, 0x0019fb87, + 0x001dfb87, 0x0001c397, 0x0005c397, 0x0009c397, 0x000dc397, 0x0011c397, + 0x0015c397, 0x0019c397, 0x001dc397, 0x0001cb97, 0x0005cb97, 0x0009cb97, + 0x000dcb97, 0x0011cb97, 0x0015cb97, 0x0019cb97, 0x001dcb97, 0x0001d397, + 0x0005d397, 0x0009d397, 0x000dd397, 0x0011d397, 0x0015d397, 0x0019d397, + 0x001dd397, 0x0001db97, 0x0005db97, 0x0009db97, 0x000ddb97, 0x0011db97, + 0x0015db97, 0x0019db97, 0x001ddb97, 0x0001e397, 0x0005e397, 0x0009e397, + 0x000de397, 0x0011e397, 0x0015e397, 0x0019e397, 0x001de397, 0x0001eb97, + 0x0005eb97, 0x0009eb97, 0x000deb97, 0x0011eb97, 0x0015eb97, 0x0019eb97, + 0x001deb97, 0x0001f397, 0x0005f397, 0x0009f397, 0x000df397, 0x0011f397, + 0x0015f397, 0x0019f397, 0x001df397, 0x0001fb97, 0x0005fb97, 0x0009fb97, + 0x000dfb97, 0x0011fb97, 0x0015fb97, 0x0019fb97, 0x001dfb97, 0x0001c3a7, + 0x0005c3a7, 0x0009c3a7, 0x000dc3a7, 0x0011c3a7, 0x0015c3a7, 0x0019c3a7, + 0x001dc3a7, 0x0001cba7, 0x0005cba7, 0x0009cba7, 0x000dcba7, 0x0011cba7, + 0x0015cba7, 0x0019cba7, 0x001dcba7, 0x0001d3a7, 0x0005d3a7, 0x0009d3a7, + 0x000dd3a7, 0x0011d3a7, 0x0015d3a7, 0x0019d3a7, 0x001dd3a7, 0x0001dba7, + 0x0005dba7, 0x0009dba7, 0x000ddba7, 0x0011dba7, 0x0015dba7, 0x0019dba7, + 0x001ddba7, 0x0001e3a7, 0x0005e3a7, 0x0009e3a7, 0x000de3a7, 0x0011e3a7, + 0x0015e3a7, 0x0019e3a7, 0x001de3a7, 0x0001eba7, 0x0005eba7, 0x0009eba7, + 0x000deba7, 0x0011eba7, 0x0015eba7, 0x0019eba7, 0x001deba7, 0x0001f3a7, + 0x0005f3a7, 0x0009f3a7, 0x000df3a7, 0x0011f3a7, 0x0015f3a7, 0x0019f3a7, + 0x001df3a7, 0x0001fba7, 0x0005fba7, 0x0009fba7, 0x000dfba7, 0x0011fba7, + 0x0015fba7, 0x0019fba7, 0x001dfba7, 0x0001c3b7, 0x0005c3b7, 0x0009c3b7, + 0x000dc3b7, 0x0011c3b7, 0x0015c3b7, 0x0019c3b7, 0x001dc3b7, 0x0001cbb7, + 0x0005cbb7, 0x0009cbb7, 0x000dcbb7, 0x0011cbb7, 0x0015cbb7, 0x0019cbb7, + 0x001dcbb7, 0x0001d3b7, 0x0005d3b7, 0x0009d3b7, 0x000dd3b7, 0x0011d3b7, + 0x0015d3b7, 0x0019d3b7, 0x001dd3b7, 0x0001dbb7, 0x0005dbb7, 0x0009dbb7, + 0x000ddbb7, 0x0011dbb7, 0x0015dbb7, 0x0019dbb7, 0x001ddbb7, 0x0001e3b7, + 0x0005e3b7, 0x0009e3b7, 0x000de3b7, 0x0011e3b7, 0x0015e3b7, 0x0019e3b7, + 0x001de3b7, 0x0001ebb7, 0x0005ebb7, 0x0009ebb7, 0x000debb7, 0x0011ebb7, + 0x0015ebb7, 0x0019ebb7, 0x001debb7, 0x0001f3b7, 0x0005f3b7, 0x0009f3b7, + 0x000df3b7, 0x0011f3b7, 0x0015f3b7, 0x0019f3b7, 0x001df3b7, 0x0001fbb7, + 0x0005fbb7, 0x0009fbb7, 0x000dfbb7, 0x0011fbb7, 0x0015fbb7, 0x0019fbb7, + 0x001dfbb7, 0x0001c3c7, 0x0005c3c7, 0x0009c3c7, 0x000dc3c7, 0x0011c3c7, + 0x0015c3c7, 0x0019c3c7, 0x001dc3c7, 0x0001cbc7, 0x0005cbc7, 0x0009cbc7, + 0x000dcbc7, 0x0011cbc7, 0x0015cbc7, 0x0019cbc7, 0x001dcbc7, 0x0001d3c7, + 0x0005d3c7, 0x0009d3c7, 0x000dd3c7, 0x0011d3c7, 0x0015d3c7, 0x0019d3c7, + 0x001dd3c7, 0x0001dbc7, 0x0005dbc7, 0x0009dbc7, 0x000ddbc7, 0x0011dbc7, + 0x0015dbc7, 0x0019dbc7, 0x001ddbc7, 0x0001e3c7, 0x0005e3c7, 0x0009e3c7, + 0x000de3c7, 0x0011e3c7, 0x0015e3c7, 0x0019e3c7, 0x001de3c7, 0x0001ebc7, + 0x0005ebc7, 0x0009ebc7, 0x000debc7, 0x0011ebc7, 0x0015ebc7, 0x0019ebc7, + 0x001debc7, 0x0001f3c7, 0x0005f3c7, 0x0009f3c7, 0x000df3c7, 0x0011f3c7, + 0x0015f3c7, 0x0019f3c7, 0x001df3c7, 0x0001fbc7, 0x0005fbc7, 0x0009fbc7, + 0x000dfbc7, 0x0011fbc7, 0x0015fbc7, 0x0019fbc7, 0x001dfbc7, 0x0001c3d7, + 0x0005c3d7, 0x0009c3d7, 0x000dc3d7, 0x0011c3d7, 0x0015c3d7, 0x0019c3d7, + 0x001dc3d7, 0x0001cbd7, 0x0005cbd7, 0x0009cbd7, 0x000dcbd7, 0x0011cbd7, + 0x0015cbd7, 0x0019cbd7, 0x001dcbd7, 0x0001d3d7, 0x0005d3d7, 0x0009d3d7, + 0x000dd3d7, 0x0011d3d7, 0x0015d3d7, 0x0019d3d7, 0x001dd3d7, 0x0001dbd7, + 0x0005dbd7, 0x0009dbd7, 0x000ddbd7, 0x0011dbd7, 0x0015dbd7, 0x0019dbd7, + 0x001ddbd7, 0x0001e3d7, 0x0005e3d7, 0x0009e3d7, 0x000de3d7, 0x0011e3d7, + 0x0015e3d7, 0x0019e3d7, 0x001de3d7, 0x0001ebd7, 0x0005ebd7, 0x0009ebd7, + 0x000debd7, 0x0011ebd7, 0x0015ebd7, 0x0019ebd7, 0x001debd7, 0x0001f3d7, + 0x0005f3d7, 0x0009f3d7, 0x000df3d7, 0x0011f3d7, 0x0015f3d7, 0x0019f3d7, + 0x001df3d7, 0x0001fbd7, 0x0005fbd7, 0x0009fbd7, 0x000dfbd7, 0x0011fbd7, + 0x0015fbd7, 0x0019fbd7, 0x001dfbd7, 0x0001c3e7, 0x0005c3e7, 0x0009c3e7, + 0x000dc3e7, 0x0011c3e7, 0x0015c3e7, 0x0019c3e7, 0x001dc3e7, 0x0001cbe7, + 0x0005cbe7, 0x0009cbe7, 0x000dcbe7, 0x0011cbe7, 0x0015cbe7, 0x0019cbe7, + 0x001dcbe7, 0x0001d3e7, 0x0005d3e7, 0x0009d3e7, 0x000dd3e7, 0x0011d3e7, + 0x0015d3e7, 0x0019d3e7, 0x001dd3e7, 0x0001dbe7, 0x0005dbe7, 0x0009dbe7, + 0x000ddbe7, 0x0011dbe7, 0x0015dbe7, 0x0019dbe7, 0x001ddbe7, 0x0001e3e7, + 0x0005e3e7, 0x0009e3e7, 0x000de3e7, 0x0011e3e7, 0x0015e3e7, 0x0019e3e7, + 0x001de3e7, 0x0001ebe7, 0x0005ebe7, 0x0009ebe7, 0x000debe7, 0x0011ebe7, + 0x0015ebe7, 0x0019ebe7, 0x001debe7, 0x0001f3e7, 0x0005f3e7, 0x0009f3e7, + 0x000df3e7, 0x0011f3e7, 0x0015f3e7, 0x0019f3e7, 0x001df3e7, 0x0001fbe7, + 0x0005fbe7, 0x0009fbe7, 0x000dfbe7, 0x0011fbe7, 0x0015fbe7, 0x0019fbe7, + 0x001dfbe7, 0x0001c3f7, 0x0005c3f7, 0x0009c3f7, 0x000dc3f7, 0x0011c3f7, + 0x0015c3f7, 0x0019c3f7, 0x001dc3f7, 0x0001cbf7, 0x0005cbf7, 0x0009cbf7, + 0x000dcbf7, 0x0011cbf7, 0x0015cbf7, 0x0019cbf7, 0x001dcbf7, 0x0001d3f7, + 0x0005d3f7, 0x0009d3f7, 0x000dd3f7, 0x0011d3f7, 0x0015d3f7, 0x0019d3f7, + 0x001dd3f7, 0x0001dbf7, 0x0005dbf7, 0x0009dbf7, 0x000ddbf7, 0x0011dbf7, + 0x0015dbf7, 0x0019dbf7, 0x001ddbf7, 0x0001e3f7, 0x0005e3f7, 0x0009e3f7, + 0x000de3f7, 0x0011e3f7, 0x0015e3f7, 0x0019e3f7, 0x001de3f7, 0x0001ebf7, + 0x0005ebf7, 0x0009ebf7, 0x000debf7, 0x0011ebf7, 0x0015ebf7, 0x0019ebf7, + 0x001debf7, 0x0001f3f7, 0x0005f3f7, 0x0009f3f7, 0x000df3f7, 0x0011f3f7, + 0x0015f3f7, 0x0019f3f7, 0x001df3f7, 0x0001fbf7, 0x0005fbf7, 0x0009fbf7, + 0x000dfbf7, 0x0011fbf7, 0x0015fbf7, 0x0019fbf7, 0x001dfbf7, 0x00e1c387, + 0x02e1c387, 0x04e1c387, 0x06e1c387, 0x08e1c387, 0x0ae1c387, 0x0ce1c387, + 0x0ee1c387, 0x00e5c387, 0x02e5c387, 0x04e5c387, 0x06e5c387, 0x08e5c387, + 0x0ae5c387, 0x0ce5c387, 0x0ee5c387, 0x00e9c387, 0x02e9c387, 0x04e9c387, + 0x06e9c387, 0x08e9c387, 0x0ae9c387, 0x0ce9c387, 0x0ee9c387, 0x00edc387, + 0x02edc387, 0x04edc387, 0x06edc387, 0x08edc387, 0x0aedc387, 0x0cedc387, + 0x0eedc387, 0x00f1c387, 0x02f1c387, 0x04f1c387, 0x06f1c387, 0x08f1c387, + 0x0af1c387, 0x0cf1c387, 0x0ef1c387, 0x00f5c387, 0x02f5c387, 0x04f5c387, + 0x06f5c387, 0x08f5c387, 0x0af5c387, 0x0cf5c387, 0x0ef5c387, 0x00f9c387, + 0x02f9c387, 0x04f9c387, 0x06f9c387, 0x08f9c387, 0x0af9c387, 0x0cf9c387, + 0x0ef9c387, 0x00fdc387, 0x02fdc387, 0x04fdc387, 0x06fdc387, 0x08fdc387, + 0x0afdc387, 0x0cfdc387, 0x0efdc387, 0x00e1cb87, 0x02e1cb87, 0x04e1cb87, + 0x06e1cb87, 0x08e1cb87, 0x0ae1cb87, 0x0ce1cb87, 0x0ee1cb87, 0x00e5cb87, + 0x02e5cb87, 0x04e5cb87, 0x06e5cb87, 0x08e5cb87, 0x0ae5cb87, 0x0ce5cb87, + 0x0ee5cb87, 0x00e9cb87, 0x02e9cb87, 0x04e9cb87, 0x06e9cb87, 0x08e9cb87, + 0x0ae9cb87, 0x0ce9cb87, 0x0ee9cb87, 0x00edcb87, 0x02edcb87, 0x04edcb87, + 0x06edcb87, 0x08edcb87, 0x0aedcb87, 0x0cedcb87, 0x0eedcb87, 0x00f1cb87, + 0x02f1cb87, 0x04f1cb87, 0x06f1cb87, 0x08f1cb87, 0x0af1cb87, 0x0cf1cb87, + 0x0ef1cb87, 0x00f5cb87, 0x02f5cb87, 0x04f5cb87, 0x06f5cb87, 0x08f5cb87, + 0x0af5cb87, 0x0cf5cb87, 0x0ef5cb87, 0x00f9cb87, 0x02f9cb87, 0x04f9cb87, + 0x06f9cb87, 0x08f9cb87, +}; + +static const uint32_t kZeroRepsDepth[BROTLI_NUM_COMMAND_SYMBOLS] = { + 0, 4, 8, 7, 7, 7, 7, 7, 7, 7, 7, 11, 14, 14, 14, 14, + 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, + 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, + 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, + 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 28, 28, 28, 28, 28, + 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, + 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, + 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, + 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, + 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, + 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, + 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, +}; + +static const uint64_t kNonZeroRepsBits[BROTLI_NUM_COMMAND_SYMBOLS] = { + 0x0000000b, 0x0000001b, 0x0000002b, 0x0000003b, 0x000002cb, 0x000006cb, + 0x00000acb, 0x00000ecb, 0x000002db, 0x000006db, 0x00000adb, 0x00000edb, + 0x000002eb, 0x000006eb, 0x00000aeb, 0x00000eeb, 0x000002fb, 0x000006fb, + 0x00000afb, 0x00000efb, 0x0000b2cb, 0x0001b2cb, 0x0002b2cb, 0x0003b2cb, + 0x0000b6cb, 0x0001b6cb, 0x0002b6cb, 0x0003b6cb, 0x0000bacb, 0x0001bacb, + 0x0002bacb, 0x0003bacb, 0x0000becb, 0x0001becb, 0x0002becb, 0x0003becb, + 0x0000b2db, 0x0001b2db, 0x0002b2db, 0x0003b2db, 0x0000b6db, 0x0001b6db, + 0x0002b6db, 0x0003b6db, 0x0000badb, 0x0001badb, 0x0002badb, 0x0003badb, + 0x0000bedb, 0x0001bedb, 0x0002bedb, 0x0003bedb, 0x0000b2eb, 0x0001b2eb, + 0x0002b2eb, 0x0003b2eb, 0x0000b6eb, 0x0001b6eb, 0x0002b6eb, 0x0003b6eb, + 0x0000baeb, 0x0001baeb, 0x0002baeb, 0x0003baeb, 0x0000beeb, 0x0001beeb, + 0x0002beeb, 0x0003beeb, 0x0000b2fb, 0x0001b2fb, 0x0002b2fb, 0x0003b2fb, + 0x0000b6fb, 0x0001b6fb, 0x0002b6fb, 0x0003b6fb, 0x0000bafb, 0x0001bafb, + 0x0002bafb, 0x0003bafb, 0x0000befb, 0x0001befb, 0x0002befb, 0x0003befb, + 0x002cb2cb, 0x006cb2cb, 0x00acb2cb, 0x00ecb2cb, 0x002db2cb, 0x006db2cb, + 0x00adb2cb, 0x00edb2cb, 0x002eb2cb, 0x006eb2cb, 0x00aeb2cb, 0x00eeb2cb, + 0x002fb2cb, 0x006fb2cb, 0x00afb2cb, 0x00efb2cb, 0x002cb6cb, 0x006cb6cb, + 0x00acb6cb, 0x00ecb6cb, 0x002db6cb, 0x006db6cb, 0x00adb6cb, 0x00edb6cb, + 0x002eb6cb, 0x006eb6cb, 0x00aeb6cb, 0x00eeb6cb, 0x002fb6cb, 0x006fb6cb, + 0x00afb6cb, 0x00efb6cb, 0x002cbacb, 0x006cbacb, 0x00acbacb, 0x00ecbacb, + 0x002dbacb, 0x006dbacb, 0x00adbacb, 0x00edbacb, 0x002ebacb, 0x006ebacb, + 0x00aebacb, 0x00eebacb, 0x002fbacb, 0x006fbacb, 0x00afbacb, 0x00efbacb, + 0x002cbecb, 0x006cbecb, 0x00acbecb, 0x00ecbecb, 0x002dbecb, 0x006dbecb, + 0x00adbecb, 0x00edbecb, 0x002ebecb, 0x006ebecb, 0x00aebecb, 0x00eebecb, + 0x002fbecb, 0x006fbecb, 0x00afbecb, 0x00efbecb, 0x002cb2db, 0x006cb2db, + 0x00acb2db, 0x00ecb2db, 0x002db2db, 0x006db2db, 0x00adb2db, 0x00edb2db, + 0x002eb2db, 0x006eb2db, 0x00aeb2db, 0x00eeb2db, 0x002fb2db, 0x006fb2db, + 0x00afb2db, 0x00efb2db, 0x002cb6db, 0x006cb6db, 0x00acb6db, 0x00ecb6db, + 0x002db6db, 0x006db6db, 0x00adb6db, 0x00edb6db, 0x002eb6db, 0x006eb6db, + 0x00aeb6db, 0x00eeb6db, 0x002fb6db, 0x006fb6db, 0x00afb6db, 0x00efb6db, + 0x002cbadb, 0x006cbadb, 0x00acbadb, 0x00ecbadb, 0x002dbadb, 0x006dbadb, + 0x00adbadb, 0x00edbadb, 0x002ebadb, 0x006ebadb, 0x00aebadb, 0x00eebadb, + 0x002fbadb, 0x006fbadb, 0x00afbadb, 0x00efbadb, 0x002cbedb, 0x006cbedb, + 0x00acbedb, 0x00ecbedb, 0x002dbedb, 0x006dbedb, 0x00adbedb, 0x00edbedb, + 0x002ebedb, 0x006ebedb, 0x00aebedb, 0x00eebedb, 0x002fbedb, 0x006fbedb, + 0x00afbedb, 0x00efbedb, 0x002cb2eb, 0x006cb2eb, 0x00acb2eb, 0x00ecb2eb, + 0x002db2eb, 0x006db2eb, 0x00adb2eb, 0x00edb2eb, 0x002eb2eb, 0x006eb2eb, + 0x00aeb2eb, 0x00eeb2eb, 0x002fb2eb, 0x006fb2eb, 0x00afb2eb, 0x00efb2eb, + 0x002cb6eb, 0x006cb6eb, 0x00acb6eb, 0x00ecb6eb, 0x002db6eb, 0x006db6eb, + 0x00adb6eb, 0x00edb6eb, 0x002eb6eb, 0x006eb6eb, 0x00aeb6eb, 0x00eeb6eb, + 0x002fb6eb, 0x006fb6eb, 0x00afb6eb, 0x00efb6eb, 0x002cbaeb, 0x006cbaeb, + 0x00acbaeb, 0x00ecbaeb, 0x002dbaeb, 0x006dbaeb, 0x00adbaeb, 0x00edbaeb, + 0x002ebaeb, 0x006ebaeb, 0x00aebaeb, 0x00eebaeb, 0x002fbaeb, 0x006fbaeb, + 0x00afbaeb, 0x00efbaeb, 0x002cbeeb, 0x006cbeeb, 0x00acbeeb, 0x00ecbeeb, + 0x002dbeeb, 0x006dbeeb, 0x00adbeeb, 0x00edbeeb, 0x002ebeeb, 0x006ebeeb, + 0x00aebeeb, 0x00eebeeb, 0x002fbeeb, 0x006fbeeb, 0x00afbeeb, 0x00efbeeb, + 0x002cb2fb, 0x006cb2fb, 0x00acb2fb, 0x00ecb2fb, 0x002db2fb, 0x006db2fb, + 0x00adb2fb, 0x00edb2fb, 0x002eb2fb, 0x006eb2fb, 0x00aeb2fb, 0x00eeb2fb, + 0x002fb2fb, 0x006fb2fb, 0x00afb2fb, 0x00efb2fb, 0x002cb6fb, 0x006cb6fb, + 0x00acb6fb, 0x00ecb6fb, 0x002db6fb, 0x006db6fb, 0x00adb6fb, 0x00edb6fb, + 0x002eb6fb, 0x006eb6fb, 0x00aeb6fb, 0x00eeb6fb, 0x002fb6fb, 0x006fb6fb, + 0x00afb6fb, 0x00efb6fb, 0x002cbafb, 0x006cbafb, 0x00acbafb, 0x00ecbafb, + 0x002dbafb, 0x006dbafb, 0x00adbafb, 0x00edbafb, 0x002ebafb, 0x006ebafb, + 0x00aebafb, 0x00eebafb, 0x002fbafb, 0x006fbafb, 0x00afbafb, 0x00efbafb, + 0x002cbefb, 0x006cbefb, 0x00acbefb, 0x00ecbefb, 0x002dbefb, 0x006dbefb, + 0x00adbefb, 0x00edbefb, 0x002ebefb, 0x006ebefb, 0x00aebefb, 0x00eebefb, + 0x002fbefb, 0x006fbefb, 0x00afbefb, 0x00efbefb, 0x0b2cb2cb, 0x1b2cb2cb, + 0x2b2cb2cb, 0x3b2cb2cb, 0x0b6cb2cb, 0x1b6cb2cb, 0x2b6cb2cb, 0x3b6cb2cb, + 0x0bacb2cb, 0x1bacb2cb, 0x2bacb2cb, 0x3bacb2cb, 0x0becb2cb, 0x1becb2cb, + 0x2becb2cb, 0x3becb2cb, 0x0b2db2cb, 0x1b2db2cb, 0x2b2db2cb, 0x3b2db2cb, + 0x0b6db2cb, 0x1b6db2cb, 0x2b6db2cb, 0x3b6db2cb, 0x0badb2cb, 0x1badb2cb, + 0x2badb2cb, 0x3badb2cb, 0x0bedb2cb, 0x1bedb2cb, 0x2bedb2cb, 0x3bedb2cb, + 0x0b2eb2cb, 0x1b2eb2cb, 0x2b2eb2cb, 0x3b2eb2cb, 0x0b6eb2cb, 0x1b6eb2cb, + 0x2b6eb2cb, 0x3b6eb2cb, 0x0baeb2cb, 0x1baeb2cb, 0x2baeb2cb, 0x3baeb2cb, + 0x0beeb2cb, 0x1beeb2cb, 0x2beeb2cb, 0x3beeb2cb, 0x0b2fb2cb, 0x1b2fb2cb, + 0x2b2fb2cb, 0x3b2fb2cb, 0x0b6fb2cb, 0x1b6fb2cb, 0x2b6fb2cb, 0x3b6fb2cb, + 0x0bafb2cb, 0x1bafb2cb, 0x2bafb2cb, 0x3bafb2cb, 0x0befb2cb, 0x1befb2cb, + 0x2befb2cb, 0x3befb2cb, 0x0b2cb6cb, 0x1b2cb6cb, 0x2b2cb6cb, 0x3b2cb6cb, + 0x0b6cb6cb, 0x1b6cb6cb, 0x2b6cb6cb, 0x3b6cb6cb, 0x0bacb6cb, 0x1bacb6cb, + 0x2bacb6cb, 0x3bacb6cb, 0x0becb6cb, 0x1becb6cb, 0x2becb6cb, 0x3becb6cb, + 0x0b2db6cb, 0x1b2db6cb, 0x2b2db6cb, 0x3b2db6cb, 0x0b6db6cb, 0x1b6db6cb, + 0x2b6db6cb, 0x3b6db6cb, 0x0badb6cb, 0x1badb6cb, 0x2badb6cb, 0x3badb6cb, + 0x0bedb6cb, 0x1bedb6cb, 0x2bedb6cb, 0x3bedb6cb, 0x0b2eb6cb, 0x1b2eb6cb, + 0x2b2eb6cb, 0x3b2eb6cb, 0x0b6eb6cb, 0x1b6eb6cb, 0x2b6eb6cb, 0x3b6eb6cb, + 0x0baeb6cb, 0x1baeb6cb, 0x2baeb6cb, 0x3baeb6cb, 0x0beeb6cb, 0x1beeb6cb, + 0x2beeb6cb, 0x3beeb6cb, 0x0b2fb6cb, 0x1b2fb6cb, 0x2b2fb6cb, 0x3b2fb6cb, + 0x0b6fb6cb, 0x1b6fb6cb, 0x2b6fb6cb, 0x3b6fb6cb, 0x0bafb6cb, 0x1bafb6cb, + 0x2bafb6cb, 0x3bafb6cb, 0x0befb6cb, 0x1befb6cb, 0x2befb6cb, 0x3befb6cb, + 0x0b2cbacb, 0x1b2cbacb, 0x2b2cbacb, 0x3b2cbacb, 0x0b6cbacb, 0x1b6cbacb, + 0x2b6cbacb, 0x3b6cbacb, 0x0bacbacb, 0x1bacbacb, 0x2bacbacb, 0x3bacbacb, + 0x0becbacb, 0x1becbacb, 0x2becbacb, 0x3becbacb, 0x0b2dbacb, 0x1b2dbacb, + 0x2b2dbacb, 0x3b2dbacb, 0x0b6dbacb, 0x1b6dbacb, 0x2b6dbacb, 0x3b6dbacb, + 0x0badbacb, 0x1badbacb, 0x2badbacb, 0x3badbacb, 0x0bedbacb, 0x1bedbacb, + 0x2bedbacb, 0x3bedbacb, 0x0b2ebacb, 0x1b2ebacb, 0x2b2ebacb, 0x3b2ebacb, + 0x0b6ebacb, 0x1b6ebacb, 0x2b6ebacb, 0x3b6ebacb, 0x0baebacb, 0x1baebacb, + 0x2baebacb, 0x3baebacb, 0x0beebacb, 0x1beebacb, 0x2beebacb, 0x3beebacb, + 0x0b2fbacb, 0x1b2fbacb, 0x2b2fbacb, 0x3b2fbacb, 0x0b6fbacb, 0x1b6fbacb, + 0x2b6fbacb, 0x3b6fbacb, 0x0bafbacb, 0x1bafbacb, 0x2bafbacb, 0x3bafbacb, + 0x0befbacb, 0x1befbacb, 0x2befbacb, 0x3befbacb, 0x0b2cbecb, 0x1b2cbecb, + 0x2b2cbecb, 0x3b2cbecb, 0x0b6cbecb, 0x1b6cbecb, 0x2b6cbecb, 0x3b6cbecb, + 0x0bacbecb, 0x1bacbecb, 0x2bacbecb, 0x3bacbecb, 0x0becbecb, 0x1becbecb, + 0x2becbecb, 0x3becbecb, 0x0b2dbecb, 0x1b2dbecb, 0x2b2dbecb, 0x3b2dbecb, + 0x0b6dbecb, 0x1b6dbecb, 0x2b6dbecb, 0x3b6dbecb, 0x0badbecb, 0x1badbecb, + 0x2badbecb, 0x3badbecb, 0x0bedbecb, 0x1bedbecb, 0x2bedbecb, 0x3bedbecb, + 0x0b2ebecb, 0x1b2ebecb, 0x2b2ebecb, 0x3b2ebecb, 0x0b6ebecb, 0x1b6ebecb, + 0x2b6ebecb, 0x3b6ebecb, 0x0baebecb, 0x1baebecb, 0x2baebecb, 0x3baebecb, + 0x0beebecb, 0x1beebecb, 0x2beebecb, 0x3beebecb, 0x0b2fbecb, 0x1b2fbecb, + 0x2b2fbecb, 0x3b2fbecb, 0x0b6fbecb, 0x1b6fbecb, 0x2b6fbecb, 0x3b6fbecb, + 0x0bafbecb, 0x1bafbecb, 0x2bafbecb, 0x3bafbecb, 0x0befbecb, 0x1befbecb, + 0x2befbecb, 0x3befbecb, 0x0b2cb2db, 0x1b2cb2db, 0x2b2cb2db, 0x3b2cb2db, + 0x0b6cb2db, 0x1b6cb2db, 0x2b6cb2db, 0x3b6cb2db, 0x0bacb2db, 0x1bacb2db, + 0x2bacb2db, 0x3bacb2db, 0x0becb2db, 0x1becb2db, 0x2becb2db, 0x3becb2db, + 0x0b2db2db, 0x1b2db2db, 0x2b2db2db, 0x3b2db2db, 0x0b6db2db, 0x1b6db2db, + 0x2b6db2db, 0x3b6db2db, 0x0badb2db, 0x1badb2db, 0x2badb2db, 0x3badb2db, + 0x0bedb2db, 0x1bedb2db, 0x2bedb2db, 0x3bedb2db, 0x0b2eb2db, 0x1b2eb2db, + 0x2b2eb2db, 0x3b2eb2db, 0x0b6eb2db, 0x1b6eb2db, 0x2b6eb2db, 0x3b6eb2db, + 0x0baeb2db, 0x1baeb2db, 0x2baeb2db, 0x3baeb2db, 0x0beeb2db, 0x1beeb2db, + 0x2beeb2db, 0x3beeb2db, 0x0b2fb2db, 0x1b2fb2db, 0x2b2fb2db, 0x3b2fb2db, + 0x0b6fb2db, 0x1b6fb2db, 0x2b6fb2db, 0x3b6fb2db, 0x0bafb2db, 0x1bafb2db, + 0x2bafb2db, 0x3bafb2db, 0x0befb2db, 0x1befb2db, 0x2befb2db, 0x3befb2db, + 0x0b2cb6db, 0x1b2cb6db, 0x2b2cb6db, 0x3b2cb6db, 0x0b6cb6db, 0x1b6cb6db, + 0x2b6cb6db, 0x3b6cb6db, 0x0bacb6db, 0x1bacb6db, 0x2bacb6db, 0x3bacb6db, + 0x0becb6db, 0x1becb6db, 0x2becb6db, 0x3becb6db, 0x0b2db6db, 0x1b2db6db, + 0x2b2db6db, 0x3b2db6db, 0x0b6db6db, 0x1b6db6db, 0x2b6db6db, 0x3b6db6db, + 0x0badb6db, 0x1badb6db, 0x2badb6db, 0x3badb6db, 0x0bedb6db, 0x1bedb6db, + 0x2bedb6db, 0x3bedb6db, 0x0b2eb6db, 0x1b2eb6db, 0x2b2eb6db, 0x3b2eb6db, + 0x0b6eb6db, 0x1b6eb6db, 0x2b6eb6db, 0x3b6eb6db, 0x0baeb6db, 0x1baeb6db, + 0x2baeb6db, 0x3baeb6db, +}; + +static const uint32_t kNonZeroRepsDepth[BROTLI_NUM_COMMAND_SYMBOLS] = { + 6, 6, 6, 6, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, + 12, 12, 12, 12, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, + 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, + 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, + 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, + 18, 18, 18, 18, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, + 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, +}; + +static const uint16_t kStaticCommandCodeBits[BROTLI_NUM_COMMAND_SYMBOLS] = { + 0, 256, 128, 384, 64, 320, 192, 448, + 32, 288, 160, 416, 96, 352, 224, 480, + 16, 272, 144, 400, 80, 336, 208, 464, + 48, 304, 176, 432, 112, 368, 240, 496, + 8, 264, 136, 392, 72, 328, 200, 456, + 40, 296, 168, 424, 104, 360, 232, 488, + 24, 280, 152, 408, 88, 344, 216, 472, + 56, 312, 184, 440, 120, 376, 248, 504, + 4, 260, 132, 388, 68, 324, 196, 452, + 36, 292, 164, 420, 100, 356, 228, 484, + 20, 276, 148, 404, 84, 340, 212, 468, + 52, 308, 180, 436, 116, 372, 244, 500, + 12, 268, 140, 396, 76, 332, 204, 460, + 44, 300, 172, 428, 108, 364, 236, 492, + 28, 284, 156, 412, 92, 348, 220, 476, + 60, 316, 188, 444, 124, 380, 252, 508, + 2, 258, 130, 386, 66, 322, 194, 450, + 34, 290, 162, 418, 98, 354, 226, 482, + 18, 274, 146, 402, 82, 338, 210, 466, + 50, 306, 178, 434, 114, 370, 242, 498, + 10, 266, 138, 394, 74, 330, 202, 458, + 42, 298, 170, 426, 106, 362, 234, 490, + 26, 282, 154, 410, 90, 346, 218, 474, + 58, 314, 186, 442, 122, 378, 250, 506, + 6, 262, 134, 390, 70, 326, 198, 454, + 38, 294, 166, 422, 102, 358, 230, 486, + 22, 278, 150, 406, 86, 342, 214, 470, + 54, 310, 182, 438, 118, 374, 246, 502, + 14, 270, 142, 398, 78, 334, 206, 462, + 46, 302, 174, 430, 110, 366, 238, 494, + 30, 286, 158, 414, 94, 350, 222, 478, + 62, 318, 190, 446, 126, 382, 254, 510, + 1, 257, 129, 385, 65, 321, 193, 449, + 33, 289, 161, 417, 97, 353, 225, 481, + 17, 273, 145, 401, 81, 337, 209, 465, + 49, 305, 177, 433, 113, 369, 241, 497, + 9, 265, 137, 393, 73, 329, 201, 457, + 41, 297, 169, 425, 105, 361, 233, 489, + 25, 281, 153, 409, 89, 345, 217, 473, + 57, 313, 185, 441, 121, 377, 249, 505, + 5, 261, 133, 389, 69, 325, 197, 453, + 37, 293, 165, 421, 101, 357, 229, 485, + 21, 277, 149, 405, 85, 341, 213, 469, + 53, 309, 181, 437, 117, 373, 245, 501, + 13, 269, 141, 397, 77, 333, 205, 461, + 45, 301, 173, 429, 109, 365, 237, 493, + 29, 285, 157, 413, 93, 349, 221, 477, + 61, 317, 189, 445, 125, 381, 253, 509, + 3, 259, 131, 387, 67, 323, 195, 451, + 35, 291, 163, 419, 99, 355, 227, 483, + 19, 275, 147, 403, 83, 339, 211, 467, + 51, 307, 179, 435, 115, 371, 243, 499, + 11, 267, 139, 395, 75, 331, 203, 459, + 43, 299, 171, 427, 107, 363, 235, 491, + 27, 283, 155, 411, 91, 347, 219, 475, + 59, 315, 187, 443, 123, 379, 251, 507, + 7, 1031, 519, 1543, 263, 1287, 775, 1799, + 135, 1159, 647, 1671, 391, 1415, 903, 1927, + 71, 1095, 583, 1607, 327, 1351, 839, 1863, + 199, 1223, 711, 1735, 455, 1479, 967, 1991, + 39, 1063, 551, 1575, 295, 1319, 807, 1831, + 167, 1191, 679, 1703, 423, 1447, 935, 1959, + 103, 1127, 615, 1639, 359, 1383, 871, 1895, + 231, 1255, 743, 1767, 487, 1511, 999, 2023, + 23, 1047, 535, 1559, 279, 1303, 791, 1815, + 151, 1175, 663, 1687, 407, 1431, 919, 1943, + 87, 1111, 599, 1623, 343, 1367, 855, 1879, + 215, 1239, 727, 1751, 471, 1495, 983, 2007, + 55, 1079, 567, 1591, 311, 1335, 823, 1847, + 183, 1207, 695, 1719, 439, 1463, 951, 1975, + 119, 1143, 631, 1655, 375, 1399, 887, 1911, + 247, 1271, 759, 1783, 503, 1527, 1015, 2039, + 15, 1039, 527, 1551, 271, 1295, 783, 1807, + 143, 1167, 655, 1679, 399, 1423, 911, 1935, + 79, 1103, 591, 1615, 335, 1359, 847, 1871, + 207, 1231, 719, 1743, 463, 1487, 975, 1999, + 47, 1071, 559, 1583, 303, 1327, 815, 1839, + 175, 1199, 687, 1711, 431, 1455, 943, 1967, + 111, 1135, 623, 1647, 367, 1391, 879, 1903, + 239, 1263, 751, 1775, 495, 1519, 1007, 2031, + 31, 1055, 543, 1567, 287, 1311, 799, 1823, + 159, 1183, 671, 1695, 415, 1439, 927, 1951, + 95, 1119, 607, 1631, 351, 1375, 863, 1887, + 223, 1247, 735, 1759, 479, 1503, 991, 2015, + 63, 1087, 575, 1599, 319, 1343, 831, 1855, + 191, 1215, 703, 1727, 447, 1471, 959, 1983, + 127, 1151, 639, 1663, 383, 1407, 895, 1919, + 255, 1279, 767, 1791, 511, 1535, 1023, 2047, +}; + +static BROTLI_INLINE void StoreStaticCommandHuffmanTree( + size_t* storage_ix, uint8_t* storage) { + BrotliWriteBits( + 56, BROTLI_MAKE_UINT64_T(0x926244U, 0x16307003U), storage_ix, storage); + BrotliWriteBits(3, 0x00000000U, storage_ix, storage); +} + +static const uint16_t kStaticDistanceCodeBits[64] = { + 0, 32, 16, 48, 8, 40, 24, 56, 4, 36, 20, 52, 12, 44, 28, 60, + 2, 34, 18, 50, 10, 42, 26, 58, 6, 38, 22, 54, 14, 46, 30, 62, + 1, 33, 17, 49, 9, 41, 25, 57, 5, 37, 21, 53, 13, 45, 29, 61, + 3, 35, 19, 51, 11, 43, 27, 59, 7, 39, 23, 55, 15, 47, 31, 63, +}; + +static BROTLI_INLINE void StoreStaticDistanceHuffmanTree( + size_t* storage_ix, uint8_t* storage) { + BrotliWriteBits(28, 0x0369DC03u, storage_ix, storage); +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_ENTROPY_ENCODE_STATIC_H_ */ diff --git a/modules/brotli/enc/fast_log.h b/modules/brotli/enc/fast_log.h new file mode 100644 index 000000000..cade1235a --- /dev/null +++ b/modules/brotli/enc/fast_log.h @@ -0,0 +1,147 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Utilities for fast computation of logarithms. */ + +#ifndef BROTLI_ENC_FAST_LOG_H_ +#define BROTLI_ENC_FAST_LOG_H_ + +#include <math.h> + +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static BROTLI_INLINE uint32_t Log2FloorNonZero(size_t n) { + /* TODO: generalize and move to platform.h */ +#if BROTLI_GNUC_HAS_BUILTIN(__builtin_clz, 3, 4, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) + return 31u ^ (uint32_t)__builtin_clz((uint32_t)n); +#else + uint32_t result = 0; + while (n >>= 1) result++; + return result; +#endif +} + +/* A lookup table for small values of log2(int) to be used in entropy + computation. + + ", ".join(["%.16ff" % x for x in [0.0]+[log2(x) for x in range(1, 256)]]) */ +static const float kLog2Table[] = { + 0.0000000000000000f, 0.0000000000000000f, 1.0000000000000000f, + 1.5849625007211563f, 2.0000000000000000f, 2.3219280948873622f, + 2.5849625007211561f, 2.8073549220576042f, 3.0000000000000000f, + 3.1699250014423126f, 3.3219280948873626f, 3.4594316186372978f, + 3.5849625007211565f, 3.7004397181410922f, 3.8073549220576037f, + 3.9068905956085187f, 4.0000000000000000f, 4.0874628412503400f, + 4.1699250014423122f, 4.2479275134435852f, 4.3219280948873626f, + 4.3923174227787607f, 4.4594316186372973f, 4.5235619560570131f, + 4.5849625007211570f, 4.6438561897747244f, 4.7004397181410926f, + 4.7548875021634691f, 4.8073549220576037f, 4.8579809951275728f, + 4.9068905956085187f, 4.9541963103868758f, 5.0000000000000000f, + 5.0443941193584534f, 5.0874628412503400f, 5.1292830169449664f, + 5.1699250014423122f, 5.2094533656289501f, 5.2479275134435852f, + 5.2854022188622487f, 5.3219280948873626f, 5.3575520046180838f, + 5.3923174227787607f, 5.4262647547020979f, 5.4594316186372973f, + 5.4918530963296748f, 5.5235619560570131f, 5.5545888516776376f, + 5.5849625007211570f, 5.6147098441152083f, 5.6438561897747244f, + 5.6724253419714961f, 5.7004397181410926f, 5.7279204545631996f, + 5.7548875021634691f, 5.7813597135246599f, 5.8073549220576046f, + 5.8328900141647422f, 5.8579809951275719f, 5.8826430493618416f, + 5.9068905956085187f, 5.9307373375628867f, 5.9541963103868758f, + 5.9772799234999168f, 6.0000000000000000f, 6.0223678130284544f, + 6.0443941193584534f, 6.0660891904577721f, 6.0874628412503400f, + 6.1085244567781700f, 6.1292830169449672f, 6.1497471195046822f, + 6.1699250014423122f, 6.1898245588800176f, 6.2094533656289510f, + 6.2288186904958804f, 6.2479275134435861f, 6.2667865406949019f, + 6.2854022188622487f, 6.3037807481771031f, 6.3219280948873617f, + 6.3398500028846252f, 6.3575520046180847f, 6.3750394313469254f, + 6.3923174227787598f, 6.4093909361377026f, 6.4262647547020979f, + 6.4429434958487288f, 6.4594316186372982f, 6.4757334309663976f, + 6.4918530963296748f, 6.5077946401986964f, 6.5235619560570131f, + 6.5391588111080319f, 6.5545888516776376f, 6.5698556083309478f, + 6.5849625007211561f, 6.5999128421871278f, 6.6147098441152092f, + 6.6293566200796095f, 6.6438561897747253f, 6.6582114827517955f, + 6.6724253419714952f, 6.6865005271832185f, 6.7004397181410917f, + 6.7142455176661224f, 6.7279204545631988f, 6.7414669864011465f, + 6.7548875021634691f, 6.7681843247769260f, 6.7813597135246599f, + 6.7944158663501062f, 6.8073549220576037f, 6.8201789624151887f, + 6.8328900141647422f, 6.8454900509443757f, 6.8579809951275719f, + 6.8703647195834048f, 6.8826430493618416f, 6.8948177633079437f, + 6.9068905956085187f, 6.9188632372745955f, 6.9307373375628867f, + 6.9425145053392399f, 6.9541963103868758f, 6.9657842846620879f, + 6.9772799234999168f, 6.9886846867721664f, 7.0000000000000000f, + 7.0112272554232540f, 7.0223678130284544f, 7.0334230015374501f, + 7.0443941193584534f, 7.0552824355011898f, 7.0660891904577721f, + 7.0768155970508317f, 7.0874628412503400f, 7.0980320829605272f, + 7.1085244567781700f, 7.1189410727235076f, 7.1292830169449664f, + 7.1395513523987937f, 7.1497471195046822f, 7.1598713367783891f, + 7.1699250014423130f, 7.1799090900149345f, 7.1898245588800176f, + 7.1996723448363644f, 7.2094533656289492f, 7.2191685204621621f, + 7.2288186904958804f, 7.2384047393250794f, 7.2479275134435861f, + 7.2573878426926521f, 7.2667865406949019f, 7.2761244052742384f, + 7.2854022188622487f, 7.2946207488916270f, 7.3037807481771031f, + 7.3128829552843557f, 7.3219280948873617f, 7.3309168781146177f, + 7.3398500028846243f, 7.3487281542310781f, 7.3575520046180847f, + 7.3663222142458151f, 7.3750394313469254f, 7.3837042924740528f, + 7.3923174227787607f, 7.4008794362821844f, 7.4093909361377026f, + 7.4178525148858991f, 7.4262647547020979f, 7.4346282276367255f, + 7.4429434958487288f, 7.4512111118323299f, 7.4594316186372973f, + 7.4676055500829976f, 7.4757334309663976f, 7.4838157772642564f, + 7.4918530963296748f, 7.4998458870832057f, 7.5077946401986964f, + 7.5156998382840436f, 7.5235619560570131f, 7.5313814605163119f, + 7.5391588111080319f, 7.5468944598876373f, 7.5545888516776376f, + 7.5622424242210728f, 7.5698556083309478f, 7.5774288280357487f, + 7.5849625007211561f, 7.5924570372680806f, 7.5999128421871278f, + 7.6073303137496113f, 7.6147098441152075f, 7.6220518194563764f, + 7.6293566200796095f, 7.6366246205436488f, 7.6438561897747244f, + 7.6510516911789290f, 7.6582114827517955f, 7.6653359171851765f, + 7.6724253419714952f, 7.6794800995054464f, 7.6865005271832185f, + 7.6934869574993252f, 7.7004397181410926f, 7.7073591320808825f, + 7.7142455176661224f, 7.7210991887071856f, 7.7279204545631996f, + 7.7347096202258392f, 7.7414669864011465f, 7.7481928495894596f, + 7.7548875021634691f, 7.7615512324444795f, 7.7681843247769260f, + 7.7747870596011737f, 7.7813597135246608f, 7.7879025593914317f, + 7.7944158663501062f, 7.8008998999203047f, 7.8073549220576037f, + 7.8137811912170374f, 7.8201789624151887f, 7.8265484872909159f, + 7.8328900141647422f, 7.8392037880969445f, 7.8454900509443757f, + 7.8517490414160571f, 7.8579809951275719f, 7.8641861446542798f, + 7.8703647195834048f, 7.8765169465650002f, 7.8826430493618425f, + 7.8887432488982601f, 7.8948177633079446f, 7.9008668079807496f, + 7.9068905956085187f, 7.9128893362299619f, 7.9188632372745955f, + 7.9248125036057813f, 7.9307373375628867f, 7.9366379390025719f, + 7.9425145053392399f, 7.9483672315846778f, 7.9541963103868758f, + 7.9600019320680806f, 7.9657842846620870f, 7.9715435539507720f, + 7.9772799234999168f, 7.9829935746943104f, 7.9886846867721664f, + 7.9943534368588578f +}; + +#define LOG_2_INV 1.4426950408889634 + +/* Faster logarithm for small integers, with the property of log2(0) == 0. */ +static BROTLI_INLINE double FastLog2(size_t v) { + if (v < sizeof(kLog2Table) / sizeof(kLog2Table[0])) { + return kLog2Table[v]; + } +#if (defined(_MSC_VER) && _MSC_VER <= 1700) || \ + (defined(__ANDROID_API__) && __ANDROID_API__ < 18) + /* Visual Studio 2012 and Android API levels < 18 do not have the log2() + * function defined, so we use log() and a multiplication instead. */ + return log((double)v) * LOG_2_INV; +#else + return log2((double)v); +#endif +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_FAST_LOG_H_ */ diff --git a/modules/brotli/enc/find_match_length.h b/modules/brotli/enc/find_match_length.h new file mode 100644 index 000000000..bc428cffd --- /dev/null +++ b/modules/brotli/enc/find_match_length.h @@ -0,0 +1,80 @@ +/* Copyright 2010 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Function to find maximal matching prefixes of strings. */ + +#ifndef BROTLI_ENC_FIND_MATCH_LENGTH_H_ +#define BROTLI_ENC_FIND_MATCH_LENGTH_H_ + +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* Separate implementation for little-endian 64-bit targets, for speed. */ +#if defined(__GNUC__) && defined(_LP64) && defined(BROTLI_LITTLE_ENDIAN) + +static BROTLI_INLINE size_t FindMatchLengthWithLimit(const uint8_t* s1, + const uint8_t* s2, + size_t limit) { + size_t matched = 0; + size_t limit2 = (limit >> 3) + 1; /* + 1 is for pre-decrement in while */ + while (BROTLI_PREDICT_TRUE(--limit2)) { + if (BROTLI_PREDICT_FALSE(BROTLI_UNALIGNED_LOAD64LE(s2) == + BROTLI_UNALIGNED_LOAD64LE(s1 + matched))) { + s2 += 8; + matched += 8; + } else { + uint64_t x = BROTLI_UNALIGNED_LOAD64LE(s2) ^ + BROTLI_UNALIGNED_LOAD64LE(s1 + matched); + size_t matching_bits = (size_t)__builtin_ctzll(x); + matched += matching_bits >> 3; + return matched; + } + } + limit = (limit & 7) + 1; /* + 1 is for pre-decrement in while */ + while (--limit) { + if (BROTLI_PREDICT_TRUE(s1[matched] == *s2)) { + ++s2; + ++matched; + } else { + return matched; + } + } + return matched; +} +#else +static BROTLI_INLINE size_t FindMatchLengthWithLimit(const uint8_t* s1, + const uint8_t* s2, + size_t limit) { + size_t matched = 0; + const uint8_t* s2_limit = s2 + limit; + const uint8_t* s2_ptr = s2; + /* Find out how long the match is. We loop over the data 32 bits at a + time until we find a 32-bit block that doesn't match; then we find + the first non-matching bit and use that to calculate the total + length of the match. */ + while (s2_ptr <= s2_limit - 4 && + BrotliUnalignedRead32(s2_ptr) == + BrotliUnalignedRead32(s1 + matched)) { + s2_ptr += 4; + matched += 4; + } + while ((s2_ptr < s2_limit) && (s1[matched] == *s2_ptr)) { + ++s2_ptr; + ++matched; + } + return matched; +} +#endif + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_FIND_MATCH_LENGTH_H_ */ diff --git a/modules/brotli/enc/hash.h b/modules/brotli/enc/hash.h new file mode 100644 index 000000000..8c5a7bb5a --- /dev/null +++ b/modules/brotli/enc/hash.h @@ -0,0 +1,498 @@ +/* Copyright 2010 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* A (forgetful) hash table to the data seen by the compressor, to + help create backward references to previous data. */ + +#ifndef BROTLI_ENC_HASH_H_ +#define BROTLI_ENC_HASH_H_ + +#include <string.h> /* memcmp, memset */ + +#include "../common/constants.h" +#include "../common/dictionary.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./encoder_dict.h" +#include "./fast_log.h" +#include "./find_match_length.h" +#include "./memory.h" +#include "./quality.h" +#include "./static_dict.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* Pointer to hasher data. + * + * Excluding initialization and destruction, hasher can be passed as + * HasherHandle by value. + * + * Typically hasher data consists of 3 sections: + * * HasherCommon structure + * * private structured hasher data, depending on hasher type + * * private dynamic hasher data, depending on hasher type and parameters + * + * Using "define" instead of "typedef", because on MSVC __restrict does not work + * on typedef pointer types. */ +#define HasherHandle uint8_t* + +typedef struct { + BrotliHasherParams params; + + /* False if hasher needs to be "prepared" before use. */ + BROTLI_BOOL is_prepared_; + + size_t dict_num_lookups; + size_t dict_num_matches; +} HasherCommon; + +static BROTLI_INLINE HasherCommon* GetHasherCommon(HasherHandle handle) { + return (HasherCommon*)handle; +} + +#define score_t size_t + +static const uint32_t kCutoffTransformsCount = 10; +/* 0, 12, 27, 23, 42, 63, 56, 48, 59, 64 */ +/* 0+0, 4+8, 8+19, 12+11, 16+26, 20+43, 24+32, 28+20, 32+27, 36+28 */ +static const uint64_t kCutoffTransforms = + BROTLI_MAKE_UINT64_T(0x071B520A, 0xDA2D3200); + +typedef struct HasherSearchResult { + size_t len; + size_t distance; + score_t score; + int len_code_delta; /* == len_code - len */ +} HasherSearchResult; + +/* kHashMul32 multiplier has these properties: + * The multiplier must be odd. Otherwise we may lose the highest bit. + * No long streaks of ones or zeros. + * There is no effort to ensure that it is a prime, the oddity is enough + for this use. + * The number has been tuned heuristically against compression benchmarks. */ +static const uint32_t kHashMul32 = 0x1E35A7BD; +static const uint64_t kHashMul64 = BROTLI_MAKE_UINT64_T(0x1E35A7BD, 0x1E35A7BD); +static const uint64_t kHashMul64Long = + BROTLI_MAKE_UINT64_T(0x1FE35A7Bu, 0xD3579BD3u); + +static BROTLI_INLINE uint32_t Hash14(const uint8_t* data) { + uint32_t h = BROTLI_UNALIGNED_LOAD32LE(data) * kHashMul32; + /* The higher bits contain more mixture from the multiplication, + so we take our results from there. */ + return h >> (32 - 14); +} + +static BROTLI_INLINE void PrepareDistanceCache( + int* BROTLI_RESTRICT distance_cache, const int num_distances) { + if (num_distances > 4) { + int last_distance = distance_cache[0]; + distance_cache[4] = last_distance - 1; + distance_cache[5] = last_distance + 1; + distance_cache[6] = last_distance - 2; + distance_cache[7] = last_distance + 2; + distance_cache[8] = last_distance - 3; + distance_cache[9] = last_distance + 3; + if (num_distances > 10) { + int next_last_distance = distance_cache[1]; + distance_cache[10] = next_last_distance - 1; + distance_cache[11] = next_last_distance + 1; + distance_cache[12] = next_last_distance - 2; + distance_cache[13] = next_last_distance + 2; + distance_cache[14] = next_last_distance - 3; + distance_cache[15] = next_last_distance + 3; + } + } +} + +#define BROTLI_LITERAL_BYTE_SCORE 135 +#define BROTLI_DISTANCE_BIT_PENALTY 30 +/* Score must be positive after applying maximal penalty. */ +#define BROTLI_SCORE_BASE (BROTLI_DISTANCE_BIT_PENALTY * 8 * sizeof(size_t)) + +/* Usually, we always choose the longest backward reference. This function + allows for the exception of that rule. + + If we choose a backward reference that is further away, it will + usually be coded with more bits. We approximate this by assuming + log2(distance). If the distance can be expressed in terms of the + last four distances, we use some heuristic constants to estimate + the bits cost. For the first up to four literals we use the bit + cost of the literals from the literal cost model, after that we + use the average bit cost of the cost model. + + This function is used to sometimes discard a longer backward reference + when it is not much longer and the bit cost for encoding it is more + than the saved literals. + + backward_reference_offset MUST be positive. */ +static BROTLI_INLINE score_t BackwardReferenceScore( + size_t copy_length, size_t backward_reference_offset) { + return BROTLI_SCORE_BASE + BROTLI_LITERAL_BYTE_SCORE * (score_t)copy_length - + BROTLI_DISTANCE_BIT_PENALTY * Log2FloorNonZero(backward_reference_offset); +} + +static BROTLI_INLINE score_t BackwardReferenceScoreUsingLastDistance( + size_t copy_length) { + return BROTLI_LITERAL_BYTE_SCORE * (score_t)copy_length + + BROTLI_SCORE_BASE + 15; +} + +static BROTLI_INLINE score_t BackwardReferencePenaltyUsingLastDistance( + size_t distance_short_code) { + return (score_t)39 + ((0x1CA10 >> (distance_short_code & 0xE)) & 0xE); +} + +static BROTLI_INLINE BROTLI_BOOL TestStaticDictionaryItem( + const BrotliEncoderDictionary* dictionary, size_t item, + const uint8_t* data, size_t max_length, size_t max_backward, + size_t max_distance, HasherSearchResult* out) { + size_t len; + size_t word_idx; + size_t offset; + size_t matchlen; + size_t backward; + score_t score; + len = item & 0x1F; + word_idx = item >> 5; + offset = dictionary->words->offsets_by_length[len] + len * word_idx; + if (len > max_length) { + return BROTLI_FALSE; + } + + matchlen = + FindMatchLengthWithLimit(data, &dictionary->words->data[offset], len); + if (matchlen + dictionary->cutoffTransformsCount <= len || matchlen == 0) { + return BROTLI_FALSE; + } + { + size_t cut = len - matchlen; + size_t transform_id = (cut << 2) + + (size_t)((dictionary->cutoffTransforms >> (cut * 6)) & 0x3F); + backward = max_backward + 1 + word_idx + + (transform_id << dictionary->words->size_bits_by_length[len]); + } + if (backward > max_distance) { + return BROTLI_FALSE; + } + score = BackwardReferenceScore(matchlen, backward); + if (score < out->score) { + return BROTLI_FALSE; + } + out->len = matchlen; + out->len_code_delta = (int)len - (int)matchlen; + out->distance = backward; + out->score = score; + return BROTLI_TRUE; +} + +static BROTLI_INLINE void SearchInStaticDictionary( + const BrotliEncoderDictionary* dictionary, + HasherHandle handle, const uint8_t* data, size_t max_length, + size_t max_backward, size_t max_distance, + HasherSearchResult* out, BROTLI_BOOL shallow) { + size_t key; + size_t i; + HasherCommon* self = GetHasherCommon(handle); + if (self->dict_num_matches < (self->dict_num_lookups >> 7)) { + return; + } + key = Hash14(data) << 1; + for (i = 0; i < (shallow ? 1u : 2u); ++i, ++key) { + size_t item = dictionary->hash_table[key]; + self->dict_num_lookups++; + if (item != 0) { + BROTLI_BOOL item_matches = TestStaticDictionaryItem( + dictionary, item, data, + max_length, max_backward, max_distance, out); + if (item_matches) { + self->dict_num_matches++; + } + } + } +} + +typedef struct BackwardMatch { + uint32_t distance; + uint32_t length_and_code; +} BackwardMatch; + +static BROTLI_INLINE void InitBackwardMatch(BackwardMatch* self, + size_t dist, size_t len) { + self->distance = (uint32_t)dist; + self->length_and_code = (uint32_t)(len << 5); +} + +static BROTLI_INLINE void InitDictionaryBackwardMatch(BackwardMatch* self, + size_t dist, size_t len, size_t len_code) { + self->distance = (uint32_t)dist; + self->length_and_code = + (uint32_t)((len << 5) | (len == len_code ? 0 : len_code)); +} + +static BROTLI_INLINE size_t BackwardMatchLength(const BackwardMatch* self) { + return self->length_and_code >> 5; +} + +static BROTLI_INLINE size_t BackwardMatchLengthCode(const BackwardMatch* self) { + size_t code = self->length_and_code & 31; + return code ? code : BackwardMatchLength(self); +} + +#define EXPAND_CAT(a, b) CAT(a, b) +#define CAT(a, b) a ## b +#define FN(X) EXPAND_CAT(X, HASHER()) + +#define HASHER() H10 +#define BUCKET_BITS 17 +#define MAX_TREE_SEARCH_DEPTH 64 +#define MAX_TREE_COMP_LENGTH 128 +#include "./hash_to_binary_tree_inc.h" /* NOLINT(build/include) */ +#undef MAX_TREE_SEARCH_DEPTH +#undef MAX_TREE_COMP_LENGTH +#undef BUCKET_BITS +#undef HASHER +/* MAX_NUM_MATCHES == 64 + MAX_TREE_SEARCH_DEPTH */ +#define MAX_NUM_MATCHES_H10 128 + +/* For BUCKET_SWEEP == 1, enabling the dictionary lookup makes compression + a little faster (0.5% - 1%) and it compresses 0.15% better on small text + and HTML inputs. */ + +#define HASHER() H2 +#define BUCKET_BITS 16 +#define BUCKET_SWEEP 1 +#define HASH_LEN 5 +#define USE_DICTIONARY 1 +#include "./hash_longest_match_quickly_inc.h" /* NOLINT(build/include) */ +#undef BUCKET_SWEEP +#undef USE_DICTIONARY +#undef HASHER + +#define HASHER() H3 +#define BUCKET_SWEEP 2 +#define USE_DICTIONARY 0 +#include "./hash_longest_match_quickly_inc.h" /* NOLINT(build/include) */ +#undef USE_DICTIONARY +#undef BUCKET_SWEEP +#undef BUCKET_BITS +#undef HASHER + +#define HASHER() H4 +#define BUCKET_BITS 17 +#define BUCKET_SWEEP 4 +#define USE_DICTIONARY 1 +#include "./hash_longest_match_quickly_inc.h" /* NOLINT(build/include) */ +#undef USE_DICTIONARY +#undef HASH_LEN +#undef BUCKET_SWEEP +#undef BUCKET_BITS +#undef HASHER + +#define HASHER() H5 +#include "./hash_longest_match_inc.h" /* NOLINT(build/include) */ +#undef HASHER + +#define HASHER() H6 +#include "./hash_longest_match64_inc.h" /* NOLINT(build/include) */ +#undef HASHER + +#define BUCKET_BITS 15 + +#define NUM_LAST_DISTANCES_TO_CHECK 4 +#define NUM_BANKS 1 +#define BANK_BITS 16 +#define HASHER() H40 +#include "./hash_forgetful_chain_inc.h" /* NOLINT(build/include) */ +#undef HASHER +#undef NUM_LAST_DISTANCES_TO_CHECK + +#define NUM_LAST_DISTANCES_TO_CHECK 10 +#define HASHER() H41 +#include "./hash_forgetful_chain_inc.h" /* NOLINT(build/include) */ +#undef HASHER +#undef NUM_LAST_DISTANCES_TO_CHECK +#undef NUM_BANKS +#undef BANK_BITS + +#define NUM_LAST_DISTANCES_TO_CHECK 16 +#define NUM_BANKS 512 +#define BANK_BITS 9 +#define HASHER() H42 +#include "./hash_forgetful_chain_inc.h" /* NOLINT(build/include) */ +#undef HASHER +#undef NUM_LAST_DISTANCES_TO_CHECK +#undef NUM_BANKS +#undef BANK_BITS + +#undef BUCKET_BITS + +#define HASHER() H54 +#define BUCKET_BITS 20 +#define BUCKET_SWEEP 4 +#define HASH_LEN 7 +#define USE_DICTIONARY 0 +#include "./hash_longest_match_quickly_inc.h" /* NOLINT(build/include) */ +#undef USE_DICTIONARY +#undef HASH_LEN +#undef BUCKET_SWEEP +#undef BUCKET_BITS +#undef HASHER + +/* fast large window hashers */ + +#define HASHER() HROLLING_FAST +#define CHUNKLEN 32 +#define JUMP 4 +#define NUMBUCKETS 16777216 +#define MASK ((NUMBUCKETS * 64) - 1) +#include "./hash_rolling_inc.h" /* NOLINT(build/include) */ +#undef JUMP +#undef HASHER + + +#define HASHER() HROLLING +#define JUMP 1 +#include "./hash_rolling_inc.h" /* NOLINT(build/include) */ +#undef MASK +#undef NUMBUCKETS +#undef JUMP +#undef CHUNKLEN +#undef HASHER + +#define HASHER() H35 +#define HASHER_A H3 +#define HASHER_B HROLLING_FAST +#include "./hash_composite_inc.h" /* NOLINT(build/include) */ +#undef HASHER_A +#undef HASHER_B +#undef HASHER + +#define HASHER() H55 +#define HASHER_A H54 +#define HASHER_B HROLLING_FAST +#include "./hash_composite_inc.h" /* NOLINT(build/include) */ +#undef HASHER_A +#undef HASHER_B +#undef HASHER + +#define HASHER() H65 +#define HASHER_A H6 +#define HASHER_B HROLLING +#include "./hash_composite_inc.h" /* NOLINT(build/include) */ +#undef HASHER_A +#undef HASHER_B +#undef HASHER + +#undef FN +#undef CAT +#undef EXPAND_CAT + +#define FOR_GENERIC_HASHERS(H) H(2) H(3) H(4) H(5) H(6) H(40) H(41) H(42) H(54)\ + H(35) H(55) H(65) +#define FOR_ALL_HASHERS(H) FOR_GENERIC_HASHERS(H) H(10) + +static BROTLI_INLINE void DestroyHasher( + MemoryManager* m, HasherHandle* handle) { + if (*handle == NULL) return; + BROTLI_FREE(m, *handle); +} + +static BROTLI_INLINE void HasherReset(HasherHandle handle) { + if (handle == NULL) return; + GetHasherCommon(handle)->is_prepared_ = BROTLI_FALSE; +} + +static BROTLI_INLINE size_t HasherSize(const BrotliEncoderParams* params, + BROTLI_BOOL one_shot, const size_t input_size) { + size_t result = sizeof(HasherCommon); + switch (params->hasher.type) { +#define SIZE_(N) \ + case N: \ + result += HashMemAllocInBytesH ## N(params, one_shot, input_size); \ + break; + FOR_ALL_HASHERS(SIZE_) +#undef SIZE_ + default: + break; + } + return result; +} + +static BROTLI_INLINE void HasherSetup(MemoryManager* m, HasherHandle* handle, + BrotliEncoderParams* params, const uint8_t* data, size_t position, + size_t input_size, BROTLI_BOOL is_last) { + HasherHandle self = NULL; + HasherCommon* common = NULL; + BROTLI_BOOL one_shot = (position == 0 && is_last); + if (*handle == NULL) { + size_t alloc_size; + ChooseHasher(params, ¶ms->hasher); + alloc_size = HasherSize(params, one_shot, input_size); + self = BROTLI_ALLOC(m, uint8_t, alloc_size); + if (BROTLI_IS_OOM(m)) return; + *handle = self; + common = GetHasherCommon(self); + common->params = params->hasher; + switch (common->params.type) { +#define INITIALIZE_(N) \ + case N: \ + InitializeH ## N(*handle, params); \ + break; + FOR_ALL_HASHERS(INITIALIZE_); +#undef INITIALIZE_ + default: + break; + } + HasherReset(*handle); + } + + self = *handle; + common = GetHasherCommon(self); + if (!common->is_prepared_) { + switch (common->params.type) { +#define PREPARE_(N) \ + case N: \ + PrepareH ## N(self, one_shot, input_size, data); \ + break; + FOR_ALL_HASHERS(PREPARE_) +#undef PREPARE_ + default: break; + } + if (position == 0) { + common->dict_num_lookups = 0; + common->dict_num_matches = 0; + } + common->is_prepared_ = BROTLI_TRUE; + } +} + +static BROTLI_INLINE void InitOrStitchToPreviousBlock( + MemoryManager* m, HasherHandle* handle, const uint8_t* data, size_t mask, + BrotliEncoderParams* params, size_t position, size_t input_size, + BROTLI_BOOL is_last) { + HasherHandle self; + HasherSetup(m, handle, params, data, position, input_size, is_last); + if (BROTLI_IS_OOM(m)) return; + self = *handle; + switch (GetHasherCommon(self)->params.type) { +#define INIT_(N) \ + case N: \ + StitchToPreviousBlockH ## N(self, input_size, position, data, mask); \ + break; + FOR_ALL_HASHERS(INIT_) +#undef INIT_ + default: break; + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_HASH_H_ */ diff --git a/modules/brotli/enc/hash_composite_inc.h b/modules/brotli/enc/hash_composite_inc.h new file mode 100644 index 000000000..b266aa2f8 --- /dev/null +++ b/modules/brotli/enc/hash_composite_inc.h @@ -0,0 +1,136 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2018 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN, HASHER_A, HASHER_B */ + +/* Composite hasher: This hasher allows to combine two other hashers, HASHER_A + and HASHER_B. */ + +#define HashComposite HASHER() + +#define FN_A(X) EXPAND_CAT(X, HASHER_A) +#define FN_B(X) EXPAND_CAT(X, HASHER_B) + +static BROTLI_INLINE size_t FN(HashTypeLength)(void) { + size_t a = FN_A(HashTypeLength)(); + size_t b = FN_B(HashTypeLength)(); + return a > b ? a : b; +} + +static BROTLI_INLINE size_t FN(StoreLookahead)(void) { + size_t a = FN_A(StoreLookahead)(); + size_t b = FN_B(StoreLookahead)(); + return a > b ? a : b; +} + +typedef struct HashComposite { + HasherHandle ha; + HasherHandle hb; + const BrotliEncoderParams* params; +} HashComposite; + +static BROTLI_INLINE HashComposite* FN(Self)(HasherHandle handle) { + return (HashComposite*)&(GetHasherCommon(handle)[1]); +} + +static void FN(Initialize)( + HasherHandle handle, const BrotliEncoderParams* params) { + HashComposite* self = FN(Self)(handle); + self->ha = 0; + self->hb = 0; + self->params = params; + /* TODO: Initialize of the hashers is defered to Prepare (and params + remembered here) because we don't get the one_shot and input_size params + here that are needed to know the memory size of them. Instead provide + those params to all hashers FN(Initialize) */ +} + +static void FN(Prepare)(HasherHandle handle, BROTLI_BOOL one_shot, + size_t input_size, const uint8_t* data) { + HashComposite* self = FN(Self)(handle); + if (!self->ha) { + HasherCommon* common_a; + HasherCommon* common_b; + + self->ha = handle + sizeof(HasherCommon) + sizeof(HashComposite); + common_a = (HasherCommon*)self->ha; + common_a->params = self->params->hasher; + common_a->is_prepared_ = BROTLI_FALSE; + common_a->dict_num_lookups = 0; + common_a->dict_num_matches = 0; + FN_A(Initialize)(self->ha, self->params); + + self->hb = self->ha + sizeof(HasherCommon) + FN_A(HashMemAllocInBytes)( + self->params, one_shot, input_size); + common_b = (HasherCommon*)self->hb; + common_b->params = self->params->hasher; + common_b->is_prepared_ = BROTLI_FALSE; + common_b->dict_num_lookups = 0; + common_b->dict_num_matches = 0; + FN_B(Initialize)(self->hb, self->params); + } + FN_A(Prepare)(self->ha, one_shot, input_size, data); + FN_B(Prepare)(self->hb, one_shot, input_size, data); +} + +static BROTLI_INLINE size_t FN(HashMemAllocInBytes)( + const BrotliEncoderParams* params, BROTLI_BOOL one_shot, + size_t input_size) { + return sizeof(HashComposite) + 2 * sizeof(HasherCommon) + + FN_A(HashMemAllocInBytes)(params, one_shot, input_size) + + FN_B(HashMemAllocInBytes)(params, one_shot, input_size); +} + +static BROTLI_INLINE void FN(Store)(HasherHandle BROTLI_RESTRICT handle, + const uint8_t* BROTLI_RESTRICT data, const size_t mask, const size_t ix) { + HashComposite* self = FN(Self)(handle); + FN_A(Store)(self->ha, data, mask, ix); + FN_B(Store)(self->hb, data, mask, ix); +} + +static BROTLI_INLINE void FN(StoreRange)(HasherHandle handle, + const uint8_t* data, const size_t mask, const size_t ix_start, + const size_t ix_end) { + HashComposite* self = FN(Self)(handle); + FN_A(StoreRange)(self->ha, data, mask, ix_start, ix_end); + FN_B(StoreRange)(self->hb, data, mask, ix_start, ix_end); +} + +static BROTLI_INLINE void FN(StitchToPreviousBlock)(HasherHandle handle, + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ring_buffer_mask) { + HashComposite* self = FN(Self)(handle); + FN_A(StitchToPreviousBlock)(self->ha, num_bytes, position, ringbuffer, + ring_buffer_mask); + FN_B(StitchToPreviousBlock)(self->hb, num_bytes, position, ringbuffer, + ring_buffer_mask); +} + +static BROTLI_INLINE void FN(PrepareDistanceCache)( + HasherHandle handle, int* BROTLI_RESTRICT distance_cache) { + HashComposite* self = FN(Self)(handle); + FN_A(PrepareDistanceCache)(self->ha, distance_cache); + FN_B(PrepareDistanceCache)(self->hb, distance_cache); +} + +static BROTLI_INLINE void FN(FindLongestMatch)(HasherHandle handle, + const BrotliEncoderDictionary* dictionary, + const uint8_t* BROTLI_RESTRICT data, const size_t ring_buffer_mask, + const int* BROTLI_RESTRICT distance_cache, const size_t cur_ix, + const size_t max_length, const size_t max_backward, + const size_t gap, const size_t max_distance, + HasherSearchResult* BROTLI_RESTRICT out) { + HashComposite* self = FN(Self)(handle); + FN_A(FindLongestMatch)(self->ha, dictionary, data, ring_buffer_mask, + distance_cache, cur_ix, max_length, max_backward, gap, + max_distance, out); + FN_B(FindLongestMatch)(self->hb, dictionary, data, ring_buffer_mask, + distance_cache, cur_ix, max_length, max_backward, gap, + max_distance, out); +} + +#undef HashComposite diff --git a/modules/brotli/enc/hash_forgetful_chain_inc.h b/modules/brotli/enc/hash_forgetful_chain_inc.h new file mode 100644 index 000000000..41cb3ff03 --- /dev/null +++ b/modules/brotli/enc/hash_forgetful_chain_inc.h @@ -0,0 +1,254 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN, BUCKET_BITS, NUM_BANKS, BANK_BITS, + NUM_LAST_DISTANCES_TO_CHECK */ + +/* A (forgetful) hash table to the data seen by the compressor, to + help create backward references to previous data. + + Hashes are stored in chains which are bucketed to groups. Group of chains + share a storage "bank". When more than "bank size" chain nodes are added, + oldest nodes are replaced; this way several chains may share a tail. */ + +#define HashForgetfulChain HASHER() + +#define BANK_SIZE (1 << BANK_BITS) + +/* Number of hash buckets. */ +#define BUCKET_SIZE (1 << BUCKET_BITS) + +#define CAPPED_CHAINS 0 + +static BROTLI_INLINE size_t FN(HashTypeLength)(void) { return 4; } +static BROTLI_INLINE size_t FN(StoreLookahead)(void) { return 4; } + +/* HashBytes is the function that chooses the bucket to place the address in.*/ +static BROTLI_INLINE size_t FN(HashBytes)(const uint8_t* data) { + const uint32_t h = BROTLI_UNALIGNED_LOAD32LE(data) * kHashMul32; + /* The higher bits contain more mixture from the multiplication, + so we take our results from there. */ + return h >> (32 - BUCKET_BITS); +} + +typedef struct FN(Slot) { + uint16_t delta; + uint16_t next; +} FN(Slot); + +typedef struct FN(Bank) { + FN(Slot) slots[BANK_SIZE]; +} FN(Bank); + +typedef struct HashForgetfulChain { + uint32_t addr[BUCKET_SIZE]; + uint16_t head[BUCKET_SIZE]; + /* Truncated hash used for quick rejection of "distance cache" candidates. */ + uint8_t tiny_hash[65536]; + FN(Bank) banks[NUM_BANKS]; + uint16_t free_slot_idx[NUM_BANKS]; + size_t max_hops; +} HashForgetfulChain; + +static BROTLI_INLINE HashForgetfulChain* FN(Self)(HasherHandle handle) { + return (HashForgetfulChain*)&(GetHasherCommon(handle)[1]); +} + +static void FN(Initialize)( + HasherHandle handle, const BrotliEncoderParams* params) { + FN(Self)(handle)->max_hops = + (params->quality > 6 ? 7u : 8u) << (params->quality - 4); +} + +static void FN(Prepare)(HasherHandle handle, BROTLI_BOOL one_shot, + size_t input_size, const uint8_t* data) { + HashForgetfulChain* self = FN(Self)(handle); + /* Partial preparation is 100 times slower (per socket). */ + size_t partial_prepare_threshold = BUCKET_SIZE >> 6; + if (one_shot && input_size <= partial_prepare_threshold) { + size_t i; + for (i = 0; i < input_size; ++i) { + size_t bucket = FN(HashBytes)(&data[i]); + /* See InitEmpty comment. */ + self->addr[bucket] = 0xCCCCCCCC; + self->head[bucket] = 0xCCCC; + } + } else { + /* Fill |addr| array with 0xCCCCCCCC value. Because of wrapping, position + processed by hasher never reaches 3GB + 64M; this makes all new chains + to be terminated after the first node. */ + memset(self->addr, 0xCC, sizeof(self->addr)); + memset(self->head, 0, sizeof(self->head)); + } + memset(self->tiny_hash, 0, sizeof(self->tiny_hash)); + memset(self->free_slot_idx, 0, sizeof(self->free_slot_idx)); +} + +static BROTLI_INLINE size_t FN(HashMemAllocInBytes)( + const BrotliEncoderParams* params, BROTLI_BOOL one_shot, + size_t input_size) { + BROTLI_UNUSED(params); + BROTLI_UNUSED(one_shot); + BROTLI_UNUSED(input_size); + return sizeof(HashForgetfulChain); +} + +/* Look at 4 bytes at &data[ix & mask]. Compute a hash from these, and prepend + node to corresponding chain; also update tiny_hash for current position. */ +static BROTLI_INLINE void FN(Store)(HasherHandle BROTLI_RESTRICT handle, + const uint8_t* BROTLI_RESTRICT data, const size_t mask, const size_t ix) { + HashForgetfulChain* self = FN(Self)(handle); + const size_t key = FN(HashBytes)(&data[ix & mask]); + const size_t bank = key & (NUM_BANKS - 1); + const size_t idx = self->free_slot_idx[bank]++ & (BANK_SIZE - 1); + size_t delta = ix - self->addr[key]; + self->tiny_hash[(uint16_t)ix] = (uint8_t)key; + if (delta > 0xFFFF) delta = CAPPED_CHAINS ? 0 : 0xFFFF; + self->banks[bank].slots[idx].delta = (uint16_t)delta; + self->banks[bank].slots[idx].next = self->head[key]; + self->addr[key] = (uint32_t)ix; + self->head[key] = (uint16_t)idx; +} + +static BROTLI_INLINE void FN(StoreRange)(HasherHandle handle, + const uint8_t* data, const size_t mask, const size_t ix_start, + const size_t ix_end) { + size_t i; + for (i = ix_start; i < ix_end; ++i) { + FN(Store)(handle, data, mask, i); + } +} + +static BROTLI_INLINE void FN(StitchToPreviousBlock)(HasherHandle handle, + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ring_buffer_mask) { + if (num_bytes >= FN(HashTypeLength)() - 1 && position >= 3) { + /* Prepare the hashes for three last bytes of the last write. + These could not be calculated before, since they require knowledge + of both the previous and the current block. */ + FN(Store)(handle, ringbuffer, ring_buffer_mask, position - 3); + FN(Store)(handle, ringbuffer, ring_buffer_mask, position - 2); + FN(Store)(handle, ringbuffer, ring_buffer_mask, position - 1); + } +} + +static BROTLI_INLINE void FN(PrepareDistanceCache)( + HasherHandle handle, int* BROTLI_RESTRICT distance_cache) { + BROTLI_UNUSED(handle); + PrepareDistanceCache(distance_cache, NUM_LAST_DISTANCES_TO_CHECK); +} + +/* Find a longest backward match of &data[cur_ix] up to the length of + max_length and stores the position cur_ix in the hash table. + + REQUIRES: FN(PrepareDistanceCache) must be invoked for current distance cache + values; if this method is invoked repeatedly with the same distance + cache values, it is enough to invoke FN(PrepareDistanceCache) once. + + Does not look for matches longer than max_length. + Does not look for matches further away than max_backward. + Writes the best match into |out|. + |out|->score is updated only if a better match is found. */ +static BROTLI_INLINE void FN(FindLongestMatch)(HasherHandle handle, + const BrotliEncoderDictionary* dictionary, + const uint8_t* BROTLI_RESTRICT data, const size_t ring_buffer_mask, + const int* BROTLI_RESTRICT distance_cache, + const size_t cur_ix, const size_t max_length, const size_t max_backward, + const size_t gap, const size_t max_distance, + HasherSearchResult* BROTLI_RESTRICT out) { + HashForgetfulChain* self = FN(Self)(handle); + const size_t cur_ix_masked = cur_ix & ring_buffer_mask; + /* Don't accept a short copy from far away. */ + score_t min_score = out->score; + score_t best_score = out->score; + size_t best_len = out->len; + size_t i; + const size_t key = FN(HashBytes)(&data[cur_ix_masked]); + const uint8_t tiny_hash = (uint8_t)(key); + out->len = 0; + out->len_code_delta = 0; + /* Try last distance first. */ + for (i = 0; i < NUM_LAST_DISTANCES_TO_CHECK; ++i) { + const size_t backward = (size_t)distance_cache[i]; + size_t prev_ix = (cur_ix - backward); + /* For distance code 0 we want to consider 2-byte matches. */ + if (i > 0 && self->tiny_hash[(uint16_t)prev_ix] != tiny_hash) continue; + if (prev_ix >= cur_ix || backward > max_backward) { + continue; + } + prev_ix &= ring_buffer_mask; + { + const size_t len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 2) { + score_t score = BackwardReferenceScoreUsingLastDistance(len); + if (best_score < score) { + if (i != 0) score -= BackwardReferencePenaltyUsingLastDistance(i); + if (best_score < score) { + best_score = score; + best_len = len; + out->len = best_len; + out->distance = backward; + out->score = best_score; + } + } + } + } + } + { + const size_t bank = key & (NUM_BANKS - 1); + size_t backward = 0; + size_t hops = self->max_hops; + size_t delta = cur_ix - self->addr[key]; + size_t slot = self->head[key]; + while (hops--) { + size_t prev_ix; + size_t last = slot; + backward += delta; + if (backward > max_backward || (CAPPED_CHAINS && !delta)) break; + prev_ix = (cur_ix - backward) & ring_buffer_mask; + slot = self->banks[bank].slots[last].next; + delta = self->banks[bank].slots[last].delta; + if (cur_ix_masked + best_len > ring_buffer_mask || + prev_ix + best_len > ring_buffer_mask || + data[cur_ix_masked + best_len] != data[prev_ix + best_len]) { + continue; + } + { + const size_t len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 4) { + /* Comparing for >= 3 does not change the semantics, but just saves + for a few unnecessary binary logarithms in backward reference + score, since we are not interested in such short matches. */ + score_t score = BackwardReferenceScore(len, backward); + if (best_score < score) { + best_score = score; + best_len = len; + out->len = best_len; + out->distance = backward; + out->score = best_score; + } + } + } + } + FN(Store)(handle, data, ring_buffer_mask, cur_ix); + } + if (out->score == min_score) { + SearchInStaticDictionary(dictionary, + handle, &data[cur_ix_masked], max_length, max_backward + gap, + max_distance, out, BROTLI_FALSE); + } +} + +#undef BANK_SIZE +#undef BUCKET_SIZE +#undef CAPPED_CHAINS + +#undef HashForgetfulChain diff --git a/modules/brotli/enc/hash_longest_match64_inc.h b/modules/brotli/enc/hash_longest_match64_inc.h new file mode 100644 index 000000000..cb953a644 --- /dev/null +++ b/modules/brotli/enc/hash_longest_match64_inc.h @@ -0,0 +1,267 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2010 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN */ + +/* A (forgetful) hash table to the data seen by the compressor, to + help create backward references to previous data. + + This is a hash map of fixed size (bucket_size_) to a ring buffer of + fixed size (block_size_). The ring buffer contains the last block_size_ + index positions of the given hash key in the compressed data. */ + +#define HashLongestMatch HASHER() + +static BROTLI_INLINE size_t FN(HashTypeLength)(void) { return 8; } +static BROTLI_INLINE size_t FN(StoreLookahead)(void) { return 8; } + +/* HashBytes is the function that chooses the bucket to place the address in. */ +static BROTLI_INLINE uint32_t FN(HashBytes)(const uint8_t* data, + const uint64_t mask, + const int shift) { + const uint64_t h = (BROTLI_UNALIGNED_LOAD64LE(data) & mask) * kHashMul64Long; + /* The higher bits contain more mixture from the multiplication, + so we take our results from there. */ + return (uint32_t)(h >> shift); +} + +typedef struct HashLongestMatch { + /* Number of hash buckets. */ + size_t bucket_size_; + /* Only block_size_ newest backward references are kept, + and the older are forgotten. */ + size_t block_size_; + /* Left-shift for computing hash bucket index from hash value. */ + int hash_shift_; + /* Mask for selecting the next 4-8 bytes of input */ + uint64_t hash_mask_; + /* Mask for accessing entries in a block (in a ring-buffer manner). */ + uint32_t block_mask_; + + /* --- Dynamic size members --- */ + + /* Number of entries in a particular bucket. */ + /* uint16_t num[bucket_size]; */ + + /* Buckets containing block_size_ of backward references. */ + /* uint32_t* buckets[bucket_size * block_size]; */ +} HashLongestMatch; + +static BROTLI_INLINE HashLongestMatch* FN(Self)(HasherHandle handle) { + return (HashLongestMatch*)&(GetHasherCommon(handle)[1]); +} + +static BROTLI_INLINE uint16_t* FN(Num)(HashLongestMatch* self) { + return (uint16_t*)(&self[1]); +} + +static BROTLI_INLINE uint32_t* FN(Buckets)(HashLongestMatch* self) { + return (uint32_t*)(&FN(Num)(self)[self->bucket_size_]); +} + +static void FN(Initialize)( + HasherHandle handle, const BrotliEncoderParams* params) { + HasherCommon* common = GetHasherCommon(handle); + HashLongestMatch* self = FN(Self)(handle); + BROTLI_UNUSED(params); + self->hash_shift_ = 64 - common->params.bucket_bits; + self->hash_mask_ = (~((uint64_t)0U)) >> (64 - 8 * common->params.hash_len); + self->bucket_size_ = (size_t)1 << common->params.bucket_bits; + self->block_size_ = (size_t)1 << common->params.block_bits; + self->block_mask_ = (uint32_t)(self->block_size_ - 1); +} + +static void FN(Prepare)(HasherHandle handle, BROTLI_BOOL one_shot, + size_t input_size, const uint8_t* data) { + HashLongestMatch* self = FN(Self)(handle); + uint16_t* num = FN(Num)(self); + /* Partial preparation is 100 times slower (per socket). */ + size_t partial_prepare_threshold = self->bucket_size_ >> 6; + if (one_shot && input_size <= partial_prepare_threshold) { + size_t i; + for (i = 0; i < input_size; ++i) { + const uint32_t key = FN(HashBytes)(&data[i], self->hash_mask_, + self->hash_shift_); + num[key] = 0; + } + } else { + memset(num, 0, self->bucket_size_ * sizeof(num[0])); + } +} + +static BROTLI_INLINE size_t FN(HashMemAllocInBytes)( + const BrotliEncoderParams* params, BROTLI_BOOL one_shot, + size_t input_size) { + size_t bucket_size = (size_t)1 << params->hasher.bucket_bits; + size_t block_size = (size_t)1 << params->hasher.block_bits; + BROTLI_UNUSED(one_shot); + BROTLI_UNUSED(input_size); + return sizeof(HashLongestMatch) + bucket_size * (2 + 4 * block_size); +} + +/* Look at 4 bytes at &data[ix & mask]. + Compute a hash from these, and store the value of ix at that position. */ +static BROTLI_INLINE void FN(Store)(HasherHandle handle, const uint8_t* data, + const size_t mask, const size_t ix) { + HashLongestMatch* self = FN(Self)(handle); + uint16_t* num = FN(Num)(self); + const uint32_t key = FN(HashBytes)(&data[ix & mask], self->hash_mask_, + self->hash_shift_); + const size_t minor_ix = num[key] & self->block_mask_; + const size_t offset = + minor_ix + (key << GetHasherCommon(handle)->params.block_bits); + FN(Buckets)(self)[offset] = (uint32_t)ix; + ++num[key]; +} + +static BROTLI_INLINE void FN(StoreRange)(HasherHandle handle, + const uint8_t* data, const size_t mask, const size_t ix_start, + const size_t ix_end) { + size_t i; + for (i = ix_start; i < ix_end; ++i) { + FN(Store)(handle, data, mask, i); + } +} + +static BROTLI_INLINE void FN(StitchToPreviousBlock)(HasherHandle handle, + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ringbuffer_mask) { + if (num_bytes >= FN(HashTypeLength)() - 1 && position >= 3) { + /* Prepare the hashes for three last bytes of the last write. + These could not be calculated before, since they require knowledge + of both the previous and the current block. */ + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 3); + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 2); + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 1); + } +} + +static BROTLI_INLINE void FN(PrepareDistanceCache)( + HasherHandle handle, int* BROTLI_RESTRICT distance_cache) { + PrepareDistanceCache(distance_cache, + GetHasherCommon(handle)->params.num_last_distances_to_check); +} + +/* Find a longest backward match of &data[cur_ix] up to the length of + max_length and stores the position cur_ix in the hash table. + + REQUIRES: FN(PrepareDistanceCache) must be invoked for current distance cache + values; if this method is invoked repeatedly with the same distance + cache values, it is enough to invoke FN(PrepareDistanceCache) once. + + Does not look for matches longer than max_length. + Does not look for matches further away than max_backward. + Writes the best match into |out|. + |out|->score is updated only if a better match is found. */ +static BROTLI_INLINE void FN(FindLongestMatch)(HasherHandle handle, + const BrotliEncoderDictionary* dictionary, + const uint8_t* BROTLI_RESTRICT data, const size_t ring_buffer_mask, + const int* BROTLI_RESTRICT distance_cache, const size_t cur_ix, + const size_t max_length, const size_t max_backward, + const size_t gap, const size_t max_distance, + HasherSearchResult* BROTLI_RESTRICT out) { + HasherCommon* common = GetHasherCommon(handle); + HashLongestMatch* self = FN(Self)(handle); + uint16_t* num = FN(Num)(self); + uint32_t* buckets = FN(Buckets)(self); + const size_t cur_ix_masked = cur_ix & ring_buffer_mask; + /* Don't accept a short copy from far away. */ + score_t min_score = out->score; + score_t best_score = out->score; + size_t best_len = out->len; + size_t i; + out->len = 0; + out->len_code_delta = 0; + /* Try last distance first. */ + for (i = 0; i < (size_t)common->params.num_last_distances_to_check; ++i) { + const size_t backward = (size_t)distance_cache[i]; + size_t prev_ix = (size_t)(cur_ix - backward); + if (prev_ix >= cur_ix) { + continue; + } + if (BROTLI_PREDICT_FALSE(backward > max_backward)) { + continue; + } + prev_ix &= ring_buffer_mask; + + if (cur_ix_masked + best_len > ring_buffer_mask || + prev_ix + best_len > ring_buffer_mask || + data[cur_ix_masked + best_len] != data[prev_ix + best_len]) { + continue; + } + { + const size_t len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 3 || (len == 2 && i < 2)) { + /* Comparing for >= 2 does not change the semantics, but just saves for + a few unnecessary binary logarithms in backward reference score, + since we are not interested in such short matches. */ + score_t score = BackwardReferenceScoreUsingLastDistance(len); + if (best_score < score) { + if (i != 0) score -= BackwardReferencePenaltyUsingLastDistance(i); + if (best_score < score) { + best_score = score; + best_len = len; + out->len = best_len; + out->distance = backward; + out->score = best_score; + } + } + } + } + } + { + const uint32_t key = FN(HashBytes)( + &data[cur_ix_masked], self->hash_mask_, self->hash_shift_); + uint32_t* BROTLI_RESTRICT bucket = + &buckets[key << common->params.block_bits]; + const size_t down = + (num[key] > self->block_size_) ? + (num[key] - self->block_size_) : 0u; + for (i = num[key]; i > down;) { + size_t prev_ix = bucket[--i & self->block_mask_]; + const size_t backward = cur_ix - prev_ix; + if (BROTLI_PREDICT_FALSE(backward > max_backward)) { + break; + } + prev_ix &= ring_buffer_mask; + if (cur_ix_masked + best_len > ring_buffer_mask || + prev_ix + best_len > ring_buffer_mask || + data[cur_ix_masked + best_len] != data[prev_ix + best_len]) { + continue; + } + { + const size_t len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 4) { + /* Comparing for >= 3 does not change the semantics, but just saves + for a few unnecessary binary logarithms in backward reference + score, since we are not interested in such short matches. */ + score_t score = BackwardReferenceScore(len, backward); + if (best_score < score) { + best_score = score; + best_len = len; + out->len = best_len; + out->distance = backward; + out->score = best_score; + } + } + } + } + bucket[num[key] & self->block_mask_] = (uint32_t)cur_ix; + ++num[key]; + } + if (min_score == out->score) { + SearchInStaticDictionary(dictionary, + handle, &data[cur_ix_masked], max_length, max_backward + gap, + max_distance, out, BROTLI_FALSE); + } +} + +#undef HashLongestMatch diff --git a/modules/brotli/enc/hash_longest_match_inc.h b/modules/brotli/enc/hash_longest_match_inc.h new file mode 100644 index 000000000..457f5a9ed --- /dev/null +++ b/modules/brotli/enc/hash_longest_match_inc.h @@ -0,0 +1,259 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2010 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN */ + +/* A (forgetful) hash table to the data seen by the compressor, to + help create backward references to previous data. + + This is a hash map of fixed size (bucket_size_) to a ring buffer of + fixed size (block_size_). The ring buffer contains the last block_size_ + index positions of the given hash key in the compressed data. */ + +#define HashLongestMatch HASHER() + +static BROTLI_INLINE size_t FN(HashTypeLength)(void) { return 4; } +static BROTLI_INLINE size_t FN(StoreLookahead)(void) { return 4; } + +/* HashBytes is the function that chooses the bucket to place the address in. */ +static uint32_t FN(HashBytes)(const uint8_t* data, const int shift) { + uint32_t h = BROTLI_UNALIGNED_LOAD32LE(data) * kHashMul32; + /* The higher bits contain more mixture from the multiplication, + so we take our results from there. */ + return (uint32_t)(h >> shift); +} + +typedef struct HashLongestMatch { + /* Number of hash buckets. */ + size_t bucket_size_; + /* Only block_size_ newest backward references are kept, + and the older are forgotten. */ + size_t block_size_; + /* Left-shift for computing hash bucket index from hash value. */ + int hash_shift_; + /* Mask for accessing entries in a block (in a ring-buffer manner). */ + uint32_t block_mask_; + + /* --- Dynamic size members --- */ + + /* Number of entries in a particular bucket. */ + /* uint16_t num[bucket_size]; */ + + /* Buckets containing block_size_ of backward references. */ + /* uint32_t* buckets[bucket_size * block_size]; */ +} HashLongestMatch; + +static BROTLI_INLINE HashLongestMatch* FN(Self)(HasherHandle handle) { + return (HashLongestMatch*)&(GetHasherCommon(handle)[1]); +} + +static BROTLI_INLINE uint16_t* FN(Num)(HashLongestMatch* self) { + return (uint16_t*)(&self[1]); +} + +static BROTLI_INLINE uint32_t* FN(Buckets)(HashLongestMatch* self) { + return (uint32_t*)(&FN(Num)(self)[self->bucket_size_]); +} + +static void FN(Initialize)( + HasherHandle handle, const BrotliEncoderParams* params) { + HasherCommon* common = GetHasherCommon(handle); + HashLongestMatch* self = FN(Self)(handle); + BROTLI_UNUSED(params); + self->hash_shift_ = 32 - common->params.bucket_bits; + self->bucket_size_ = (size_t)1 << common->params.bucket_bits; + self->block_size_ = (size_t)1 << common->params.block_bits; + self->block_mask_ = (uint32_t)(self->block_size_ - 1); +} + +static void FN(Prepare)(HasherHandle handle, BROTLI_BOOL one_shot, + size_t input_size, const uint8_t* data) { + HashLongestMatch* self = FN(Self)(handle); + uint16_t* num = FN(Num)(self); + /* Partial preparation is 100 times slower (per socket). */ + size_t partial_prepare_threshold = self->bucket_size_ >> 6; + if (one_shot && input_size <= partial_prepare_threshold) { + size_t i; + for (i = 0; i < input_size; ++i) { + const uint32_t key = FN(HashBytes)(&data[i], self->hash_shift_); + num[key] = 0; + } + } else { + memset(num, 0, self->bucket_size_ * sizeof(num[0])); + } +} + +static BROTLI_INLINE size_t FN(HashMemAllocInBytes)( + const BrotliEncoderParams* params, BROTLI_BOOL one_shot, + size_t input_size) { + size_t bucket_size = (size_t)1 << params->hasher.bucket_bits; + size_t block_size = (size_t)1 << params->hasher.block_bits; + BROTLI_UNUSED(one_shot); + BROTLI_UNUSED(input_size); + return sizeof(HashLongestMatch) + bucket_size * (2 + 4 * block_size); +} + +/* Look at 4 bytes at &data[ix & mask]. + Compute a hash from these, and store the value of ix at that position. */ +static BROTLI_INLINE void FN(Store)(HasherHandle handle, const uint8_t* data, + const size_t mask, const size_t ix) { + HashLongestMatch* self = FN(Self)(handle); + uint16_t* num = FN(Num)(self); + const uint32_t key = FN(HashBytes)(&data[ix & mask], self->hash_shift_); + const size_t minor_ix = num[key] & self->block_mask_; + const size_t offset = + minor_ix + (key << GetHasherCommon(handle)->params.block_bits); + FN(Buckets)(self)[offset] = (uint32_t)ix; + ++num[key]; +} + +static BROTLI_INLINE void FN(StoreRange)(HasherHandle handle, + const uint8_t* data, const size_t mask, const size_t ix_start, + const size_t ix_end) { + size_t i; + for (i = ix_start; i < ix_end; ++i) { + FN(Store)(handle, data, mask, i); + } +} + +static BROTLI_INLINE void FN(StitchToPreviousBlock)(HasherHandle handle, + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ringbuffer_mask) { + if (num_bytes >= FN(HashTypeLength)() - 1 && position >= 3) { + /* Prepare the hashes for three last bytes of the last write. + These could not be calculated before, since they require knowledge + of both the previous and the current block. */ + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 3); + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 2); + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 1); + } +} + +static BROTLI_INLINE void FN(PrepareDistanceCache)( + HasherHandle handle, int* BROTLI_RESTRICT distance_cache) { + PrepareDistanceCache(distance_cache, + GetHasherCommon(handle)->params.num_last_distances_to_check); +} + +/* Find a longest backward match of &data[cur_ix] up to the length of + max_length and stores the position cur_ix in the hash table. + + REQUIRES: FN(PrepareDistanceCache) must be invoked for current distance cache + values; if this method is invoked repeatedly with the same distance + cache values, it is enough to invoke FN(PrepareDistanceCache) once. + + Does not look for matches longer than max_length. + Does not look for matches further away than max_backward. + Writes the best match into |out|. + |out|->score is updated only if a better match is found. */ +static BROTLI_INLINE void FN(FindLongestMatch)(HasherHandle handle, + const BrotliEncoderDictionary* dictionary, + const uint8_t* BROTLI_RESTRICT data, const size_t ring_buffer_mask, + const int* BROTLI_RESTRICT distance_cache, const size_t cur_ix, + const size_t max_length, const size_t max_backward, + const size_t gap, const size_t max_distance, + HasherSearchResult* BROTLI_RESTRICT out) { + HasherCommon* common = GetHasherCommon(handle); + HashLongestMatch* self = FN(Self)(handle); + uint16_t* num = FN(Num)(self); + uint32_t* buckets = FN(Buckets)(self); + const size_t cur_ix_masked = cur_ix & ring_buffer_mask; + /* Don't accept a short copy from far away. */ + score_t min_score = out->score; + score_t best_score = out->score; + size_t best_len = out->len; + size_t i; + out->len = 0; + out->len_code_delta = 0; + /* Try last distance first. */ + for (i = 0; i < (size_t)common->params.num_last_distances_to_check; ++i) { + const size_t backward = (size_t)distance_cache[i]; + size_t prev_ix = (size_t)(cur_ix - backward); + if (prev_ix >= cur_ix) { + continue; + } + if (BROTLI_PREDICT_FALSE(backward > max_backward)) { + continue; + } + prev_ix &= ring_buffer_mask; + + if (cur_ix_masked + best_len > ring_buffer_mask || + prev_ix + best_len > ring_buffer_mask || + data[cur_ix_masked + best_len] != data[prev_ix + best_len]) { + continue; + } + { + const size_t len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 3 || (len == 2 && i < 2)) { + /* Comparing for >= 2 does not change the semantics, but just saves for + a few unnecessary binary logarithms in backward reference score, + since we are not interested in such short matches. */ + score_t score = BackwardReferenceScoreUsingLastDistance(len); + if (best_score < score) { + if (i != 0) score -= BackwardReferencePenaltyUsingLastDistance(i); + if (best_score < score) { + best_score = score; + best_len = len; + out->len = best_len; + out->distance = backward; + out->score = best_score; + } + } + } + } + } + { + const uint32_t key = + FN(HashBytes)(&data[cur_ix_masked], self->hash_shift_); + uint32_t* BROTLI_RESTRICT bucket = + &buckets[key << common->params.block_bits]; + const size_t down = + (num[key] > self->block_size_) ? (num[key] - self->block_size_) : 0u; + for (i = num[key]; i > down;) { + size_t prev_ix = bucket[--i & self->block_mask_]; + const size_t backward = cur_ix - prev_ix; + if (BROTLI_PREDICT_FALSE(backward > max_backward)) { + break; + } + prev_ix &= ring_buffer_mask; + if (cur_ix_masked + best_len > ring_buffer_mask || + prev_ix + best_len > ring_buffer_mask || + data[cur_ix_masked + best_len] != data[prev_ix + best_len]) { + continue; + } + { + const size_t len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 4) { + /* Comparing for >= 3 does not change the semantics, but just saves + for a few unnecessary binary logarithms in backward reference + score, since we are not interested in such short matches. */ + score_t score = BackwardReferenceScore(len, backward); + if (best_score < score) { + best_score = score; + best_len = len; + out->len = best_len; + out->distance = backward; + out->score = best_score; + } + } + } + } + bucket[num[key] & self->block_mask_] = (uint32_t)cur_ix; + ++num[key]; + } + if (min_score == out->score) { + SearchInStaticDictionary(dictionary, + handle, &data[cur_ix_masked], max_length, max_backward + gap, + max_distance, out, BROTLI_FALSE); + } +} + +#undef HashLongestMatch diff --git a/modules/brotli/enc/hash_longest_match_quickly_inc.h b/modules/brotli/enc/hash_longest_match_quickly_inc.h new file mode 100644 index 000000000..a7b9639fe --- /dev/null +++ b/modules/brotli/enc/hash_longest_match_quickly_inc.h @@ -0,0 +1,235 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2010 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN, BUCKET_BITS, BUCKET_SWEEP, HASH_LEN, + USE_DICTIONARY + */ + +#define HashLongestMatchQuickly HASHER() + +#define BUCKET_SIZE (1 << BUCKET_BITS) + +#define HASH_MAP_SIZE (4 << BUCKET_BITS) + +static BROTLI_INLINE size_t FN(HashTypeLength)(void) { return 8; } +static BROTLI_INLINE size_t FN(StoreLookahead)(void) { return 8; } + +/* HashBytes is the function that chooses the bucket to place + the address in. The HashLongestMatch and HashLongestMatchQuickly + classes have separate, different implementations of hashing. */ +static uint32_t FN(HashBytes)(const uint8_t* data) { + const uint64_t h = ((BROTLI_UNALIGNED_LOAD64LE(data) << (64 - 8 * HASH_LEN)) * + kHashMul64); + /* The higher bits contain more mixture from the multiplication, + so we take our results from there. */ + return (uint32_t)(h >> (64 - BUCKET_BITS)); +} + +/* A (forgetful) hash table to the data seen by the compressor, to + help create backward references to previous data. + + This is a hash map of fixed size (BUCKET_SIZE). Starting from the + given index, BUCKET_SWEEP buckets are used to store values of a key. */ +typedef struct HashLongestMatchQuickly { + uint32_t buckets_[BUCKET_SIZE + BUCKET_SWEEP]; +} HashLongestMatchQuickly; + +static BROTLI_INLINE HashLongestMatchQuickly* FN(Self)(HasherHandle handle) { + return (HashLongestMatchQuickly*)&(GetHasherCommon(handle)[1]); +} + +static void FN(Initialize)( + HasherHandle handle, const BrotliEncoderParams* params) { + BROTLI_UNUSED(handle); + BROTLI_UNUSED(params); +} + +static void FN(Prepare)(HasherHandle handle, BROTLI_BOOL one_shot, + size_t input_size, const uint8_t* data) { + HashLongestMatchQuickly* self = FN(Self)(handle); + /* Partial preparation is 100 times slower (per socket). */ + size_t partial_prepare_threshold = HASH_MAP_SIZE >> 7; + if (one_shot && input_size <= partial_prepare_threshold) { + size_t i; + for (i = 0; i < input_size; ++i) { + const uint32_t key = FN(HashBytes)(&data[i]); + memset(&self->buckets_[key], 0, BUCKET_SWEEP * sizeof(self->buckets_[0])); + } + } else { + /* It is not strictly necessary to fill this buffer here, but + not filling will make the results of the compression stochastic + (but correct). This is because random data would cause the + system to find accidentally good backward references here and there. */ + memset(&self->buckets_[0], 0, sizeof(self->buckets_)); + } +} + +static BROTLI_INLINE size_t FN(HashMemAllocInBytes)( + const BrotliEncoderParams* params, BROTLI_BOOL one_shot, + size_t input_size) { + BROTLI_UNUSED(params); + BROTLI_UNUSED(one_shot); + BROTLI_UNUSED(input_size); + return sizeof(HashLongestMatchQuickly); +} + +/* Look at 5 bytes at &data[ix & mask]. + Compute a hash from these, and store the value somewhere within + [ix .. ix+3]. */ +static BROTLI_INLINE void FN(Store)(HasherHandle handle, + const uint8_t* data, const size_t mask, const size_t ix) { + const uint32_t key = FN(HashBytes)(&data[ix & mask]); + /* Wiggle the value with the bucket sweep range. */ + const uint32_t off = (ix >> 3) % BUCKET_SWEEP; + FN(Self)(handle)->buckets_[key + off] = (uint32_t)ix; +} + +static BROTLI_INLINE void FN(StoreRange)(HasherHandle handle, + const uint8_t* data, const size_t mask, const size_t ix_start, + const size_t ix_end) { + size_t i; + for (i = ix_start; i < ix_end; ++i) { + FN(Store)(handle, data, mask, i); + } +} + +static BROTLI_INLINE void FN(StitchToPreviousBlock)( + HasherHandle handle, size_t num_bytes, size_t position, + const uint8_t* ringbuffer, size_t ringbuffer_mask) { + if (num_bytes >= FN(HashTypeLength)() - 1 && position >= 3) { + /* Prepare the hashes for three last bytes of the last write. + These could not be calculated before, since they require knowledge + of both the previous and the current block. */ + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 3); + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 2); + FN(Store)(handle, ringbuffer, ringbuffer_mask, position - 1); + } +} + +static BROTLI_INLINE void FN(PrepareDistanceCache)( + HasherHandle handle, int* BROTLI_RESTRICT distance_cache) { + BROTLI_UNUSED(handle); + BROTLI_UNUSED(distance_cache); +} + +/* Find a longest backward match of &data[cur_ix & ring_buffer_mask] + up to the length of max_length and stores the position cur_ix in the + hash table. + + Does not look for matches longer than max_length. + Does not look for matches further away than max_backward. + Writes the best match into |out|. + |out|->score is updated only if a better match is found. */ +static BROTLI_INLINE void FN(FindLongestMatch)( + HasherHandle handle, const BrotliEncoderDictionary* dictionary, + const uint8_t* BROTLI_RESTRICT data, + const size_t ring_buffer_mask, const int* BROTLI_RESTRICT distance_cache, + const size_t cur_ix, const size_t max_length, const size_t max_backward, + const size_t gap, const size_t max_distance, + HasherSearchResult* BROTLI_RESTRICT out) { + HashLongestMatchQuickly* self = FN(Self)(handle); + const size_t best_len_in = out->len; + const size_t cur_ix_masked = cur_ix & ring_buffer_mask; + const uint32_t key = FN(HashBytes)(&data[cur_ix_masked]); + int compare_char = data[cur_ix_masked + best_len_in]; + score_t min_score = out->score; + score_t best_score = out->score; + size_t best_len = best_len_in; + size_t cached_backward = (size_t)distance_cache[0]; + size_t prev_ix = cur_ix - cached_backward; + out->len_code_delta = 0; + if (prev_ix < cur_ix) { + prev_ix &= (uint32_t)ring_buffer_mask; + if (compare_char == data[prev_ix + best_len]) { + size_t len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 4) { + const score_t score = BackwardReferenceScoreUsingLastDistance(len); + if (best_score < score) { + best_score = score; + best_len = len; + out->len = len; + out->distance = cached_backward; + out->score = best_score; + compare_char = data[cur_ix_masked + best_len]; + if (BUCKET_SWEEP == 1) { + self->buckets_[key] = (uint32_t)cur_ix; + return; + } + } + } + } + } + if (BUCKET_SWEEP == 1) { + size_t backward; + size_t len; + /* Only one to look for, don't bother to prepare for a loop. */ + prev_ix = self->buckets_[key]; + self->buckets_[key] = (uint32_t)cur_ix; + backward = cur_ix - prev_ix; + prev_ix &= (uint32_t)ring_buffer_mask; + if (compare_char != data[prev_ix + best_len_in]) { + return; + } + if (BROTLI_PREDICT_FALSE(backward == 0 || backward > max_backward)) { + return; + } + len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 4) { + const score_t score = BackwardReferenceScore(len, backward); + if (best_score < score) { + out->len = len; + out->distance = backward; + out->score = score; + return; + } + } + } else { + uint32_t* bucket = self->buckets_ + key; + int i; + prev_ix = *bucket++; + for (i = 0; i < BUCKET_SWEEP; ++i, prev_ix = *bucket++) { + const size_t backward = cur_ix - prev_ix; + size_t len; + prev_ix &= (uint32_t)ring_buffer_mask; + if (compare_char != data[prev_ix + best_len]) { + continue; + } + if (BROTLI_PREDICT_FALSE(backward == 0 || backward > max_backward)) { + continue; + } + len = FindMatchLengthWithLimit(&data[prev_ix], + &data[cur_ix_masked], + max_length); + if (len >= 4) { + const score_t score = BackwardReferenceScore(len, backward); + if (best_score < score) { + best_score = score; + best_len = len; + out->len = best_len; + out->distance = backward; + out->score = score; + compare_char = data[cur_ix_masked + best_len]; + } + } + } + } + if (USE_DICTIONARY && min_score == out->score) { + SearchInStaticDictionary(dictionary, + handle, &data[cur_ix_masked], max_length, max_backward + gap, + max_distance, out, BROTLI_TRUE); + } + self->buckets_[key + ((cur_ix >> 3) % BUCKET_SWEEP)] = (uint32_t)cur_ix; +} + +#undef HASH_MAP_SIZE +#undef BUCKET_SIZE + +#undef HashLongestMatchQuickly diff --git a/modules/brotli/enc/hash_rolling_inc.h b/modules/brotli/enc/hash_rolling_inc.h new file mode 100644 index 000000000..17f8a408e --- /dev/null +++ b/modules/brotli/enc/hash_rolling_inc.h @@ -0,0 +1,216 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2018 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN, JUMP, NUMBUCKETS, MASK, CHUNKLEN */ +/* NUMBUCKETS / (MASK + 1) = probability of storing and using hash code. */ +/* JUMP = skip bytes for speedup */ + +/* Rolling hash for long distance long string matches. Stores one position + per bucket, bucket key is computed over a long region. */ + +#define HashRolling HASHER() + +static const uint32_t FN(kRollingHashMul32) = 69069; +static const uint32_t FN(kInvalidPos) = 0xffffffff; + +/* This hasher uses a longer forward length, but returning a higher value here + will hurt compression by the main hasher when combined with a composite + hasher. The hasher tests for forward itself instead. */ +static BROTLI_INLINE size_t FN(HashTypeLength)(void) { return 4; } +static BROTLI_INLINE size_t FN(StoreLookahead)(void) { return 4; } + +/* Computes a code from a single byte. A lookup table of 256 values could be + used, but simply adding 1 works about as good. */ +static uint32_t FN(HashByte)(uint8_t byte) { + return (uint32_t)byte + 1u; +} + +static uint32_t FN(HashRollingFunctionInitial)(uint32_t state, uint8_t add, + uint32_t factor) { + return (uint32_t)(factor * state + FN(HashByte)(add)); +} + +static uint32_t FN(HashRollingFunction)(uint32_t state, uint8_t add, + uint8_t rem, uint32_t factor, + uint32_t factor_remove) { + return (uint32_t)(factor * state + + FN(HashByte)(add) - factor_remove * FN(HashByte)(rem)); +} + +typedef struct HashRolling { + uint32_t state; + uint32_t* table; + size_t next_ix; + + uint32_t chunk_len; + uint32_t factor; + uint32_t factor_remove; +} HashRolling; + +static BROTLI_INLINE HashRolling* FN(Self)(HasherHandle handle) { + return (HashRolling*)&(GetHasherCommon(handle)[1]); +} + +static void FN(Initialize)( + HasherHandle handle, const BrotliEncoderParams* params) { + HashRolling* self = FN(Self)(handle); + size_t i; + self->state = 0; + self->next_ix = 0; + + self->factor = FN(kRollingHashMul32); + + /* Compute the factor of the oldest byte to remove: factor**steps modulo + 0xffffffff (the multiplications rely on 32-bit overflow) */ + self->factor_remove = 1; + for (i = 0; i < CHUNKLEN; i += JUMP) { + self->factor_remove *= self->factor; + } + + self->table = (uint32_t*)((HasherHandle)self + sizeof(HashRolling)); + for (i = 0; i < NUMBUCKETS; i++) { + self->table[i] = FN(kInvalidPos); + } + + BROTLI_UNUSED(params); +} + +static void FN(Prepare)(HasherHandle handle, BROTLI_BOOL one_shot, + size_t input_size, const uint8_t* data) { + HashRolling* self = FN(Self)(handle); + size_t i; + /* Too small size, cannot use this hasher. */ + if (input_size < CHUNKLEN) return; + self->state = 0; + for (i = 0; i < CHUNKLEN; i += JUMP) { + self->state = FN(HashRollingFunctionInitial)( + self->state, data[i], self->factor); + } + BROTLI_UNUSED(one_shot); +} + +static BROTLI_INLINE size_t FN(HashMemAllocInBytes)( + const BrotliEncoderParams* params, BROTLI_BOOL one_shot, + size_t input_size) { + return sizeof(HashRolling) + NUMBUCKETS * sizeof(uint32_t); + BROTLI_UNUSED(params); + BROTLI_UNUSED(one_shot); + BROTLI_UNUSED(input_size); +} + +static BROTLI_INLINE void FN(Store)(HasherHandle BROTLI_RESTRICT handle, + const uint8_t* BROTLI_RESTRICT data, const size_t mask, const size_t ix) { + BROTLI_UNUSED(handle); + BROTLI_UNUSED(data); + BROTLI_UNUSED(mask); + BROTLI_UNUSED(ix); +} + +static BROTLI_INLINE void FN(StoreRange)(HasherHandle handle, + const uint8_t* data, const size_t mask, const size_t ix_start, + const size_t ix_end) { + BROTLI_UNUSED(handle); + BROTLI_UNUSED(data); + BROTLI_UNUSED(mask); + BROTLI_UNUSED(ix_start); + BROTLI_UNUSED(ix_end); +} + +static BROTLI_INLINE void FN(StitchToPreviousBlock)(HasherHandle handle, + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ring_buffer_mask) { + /* In this case we must re-initialize the hasher from scratch from the + current position. */ + HashRolling* self = FN(Self)(handle); + size_t position_masked; + size_t available = num_bytes; + if ((position & (JUMP - 1)) != 0) { + size_t diff = JUMP - (position & (JUMP - 1)); + available = (diff > available) ? 0 : (available - diff); + position += diff; + } + position_masked = position & ring_buffer_mask; + /* wrapping around ringbuffer not handled. */ + if (available > ring_buffer_mask - position_masked) { + available = ring_buffer_mask - position_masked; + } + + FN(Prepare)(handle, BROTLI_FALSE, available, + ringbuffer + (position & ring_buffer_mask)); + self->next_ix = position; + BROTLI_UNUSED(num_bytes); +} + +static BROTLI_INLINE void FN(PrepareDistanceCache)( + HasherHandle handle, int* BROTLI_RESTRICT distance_cache) { + BROTLI_UNUSED(handle); + BROTLI_UNUSED(distance_cache); +} + +static BROTLI_INLINE void FN(FindLongestMatch)(HasherHandle handle, + const BrotliEncoderDictionary* dictionary, + const uint8_t* BROTLI_RESTRICT data, const size_t ring_buffer_mask, + const int* BROTLI_RESTRICT distance_cache, const size_t cur_ix, + const size_t max_length, const size_t max_backward, + const size_t gap, const size_t max_distance, + HasherSearchResult* BROTLI_RESTRICT out) { + HashRolling* self = FN(Self)(handle); + const size_t cur_ix_masked = cur_ix & ring_buffer_mask; + size_t pos = self->next_ix; + + if ((cur_ix & (JUMP - 1)) != 0) return; + + /* Not enough lookahead */ + if (max_length < CHUNKLEN) return; + + for (pos = self->next_ix; pos <= cur_ix; pos += JUMP) { + uint32_t code = self->state & MASK; + + uint8_t rem = data[pos & ring_buffer_mask]; + uint8_t add = data[(pos + CHUNKLEN) & ring_buffer_mask]; + size_t found_ix = FN(kInvalidPos); + + self->state = FN(HashRollingFunction)( + self->state, add, rem, self->factor, self->factor_remove); + + if (code < NUMBUCKETS) { + found_ix = self->table[code]; + self->table[code] = (uint32_t)pos; + if (pos == cur_ix && found_ix != FN(kInvalidPos)) { + /* The cast to 32-bit makes backward distances up to 4GB work even + if cur_ix is above 4GB, despite using 32-bit values in the table. */ + size_t backward = (uint32_t)(cur_ix - found_ix); + if (backward <= max_backward) { + const size_t found_ix_masked = found_ix & ring_buffer_mask; + const size_t len = FindMatchLengthWithLimit(&data[found_ix_masked], + &data[cur_ix_masked], + max_length); + if (len >= 4 && len > out->len) { + score_t score = BackwardReferenceScore(len, backward); + if (score > out->score) { + out->len = len; + out->distance = backward; + out->score = score; + out->len_code_delta = 0; + } + } + } + } + } + } + + self->next_ix = cur_ix + JUMP; + + /* NOTE: this hasher does not search in the dictionary. It is used as + backup-hasher, the main hasher already searches in it. */ + BROTLI_UNUSED(dictionary); + BROTLI_UNUSED(distance_cache); + BROTLI_UNUSED(gap); + BROTLI_UNUSED(max_distance); +} + +#undef HashRolling diff --git a/modules/brotli/enc/hash_to_binary_tree_inc.h b/modules/brotli/enc/hash_to_binary_tree_inc.h new file mode 100644 index 000000000..7fb0356f5 --- /dev/null +++ b/modules/brotli/enc/hash_to_binary_tree_inc.h @@ -0,0 +1,328 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN, BUCKET_BITS, MAX_TREE_COMP_LENGTH, + MAX_TREE_SEARCH_DEPTH */ + +/* A (forgetful) hash table where each hash bucket contains a binary tree of + sequences whose first 4 bytes share the same hash code. + Each sequence is MAX_TREE_COMP_LENGTH long and is identified by its starting + position in the input data. The binary tree is sorted by the lexicographic + order of the sequences, and it is also a max-heap with respect to the + starting positions. */ + +#define HashToBinaryTree HASHER() + +#define BUCKET_SIZE (1 << BUCKET_BITS) + +static BROTLI_INLINE size_t FN(HashTypeLength)(void) { return 4; } +static BROTLI_INLINE size_t FN(StoreLookahead)(void) { + return MAX_TREE_COMP_LENGTH; +} + +static uint32_t FN(HashBytes)(const uint8_t* data) { + uint32_t h = BROTLI_UNALIGNED_LOAD32LE(data) * kHashMul32; + /* The higher bits contain more mixture from the multiplication, + so we take our results from there. */ + return h >> (32 - BUCKET_BITS); +} + +typedef struct HashToBinaryTree { + /* The window size minus 1 */ + size_t window_mask_; + + /* Hash table that maps the 4-byte hashes of the sequence to the last + position where this hash was found, which is the root of the binary + tree of sequences that share this hash bucket. */ + uint32_t buckets_[BUCKET_SIZE]; + + /* A position used to mark a non-existent sequence, i.e. a tree is empty if + its root is at invalid_pos_ and a node is a leaf if both its children + are at invalid_pos_. */ + uint32_t invalid_pos_; + + /* --- Dynamic size members --- */ + + /* The union of the binary trees of each hash bucket. The root of the tree + corresponding to a hash is a sequence starting at buckets_[hash] and + the left and right children of a sequence starting at pos are + forest_[2 * pos] and forest_[2 * pos + 1]. */ + /* uint32_t forest[2 * num_nodes] */ +} HashToBinaryTree; + +static BROTLI_INLINE HashToBinaryTree* FN(Self)(HasherHandle handle) { + return (HashToBinaryTree*)&(GetHasherCommon(handle)[1]); +} + +static BROTLI_INLINE uint32_t* FN(Forest)(HashToBinaryTree* self) { + return (uint32_t*)(&self[1]); +} + +static void FN(Initialize)( + HasherHandle handle, const BrotliEncoderParams* params) { + HashToBinaryTree* self = FN(Self)(handle); + self->window_mask_ = (1u << params->lgwin) - 1u; + self->invalid_pos_ = (uint32_t)(0 - self->window_mask_); +} + +static void FN(Prepare)(HasherHandle handle, BROTLI_BOOL one_shot, + size_t input_size, const uint8_t* data) { + HashToBinaryTree* self = FN(Self)(handle); + uint32_t invalid_pos = self->invalid_pos_; + uint32_t i; + BROTLI_UNUSED(data); + BROTLI_UNUSED(one_shot); + BROTLI_UNUSED(input_size); + for (i = 0; i < BUCKET_SIZE; i++) { + self->buckets_[i] = invalid_pos; + } +} + +static BROTLI_INLINE size_t FN(HashMemAllocInBytes)( + const BrotliEncoderParams* params, BROTLI_BOOL one_shot, + size_t input_size) { + size_t num_nodes = (size_t)1 << params->lgwin; + if (one_shot && input_size < num_nodes) { + num_nodes = input_size; + } + return sizeof(HashToBinaryTree) + 2 * sizeof(uint32_t) * num_nodes; +} + +static BROTLI_INLINE size_t FN(LeftChildIndex)(HashToBinaryTree* self, + const size_t pos) { + return 2 * (pos & self->window_mask_); +} + +static BROTLI_INLINE size_t FN(RightChildIndex)(HashToBinaryTree* self, + const size_t pos) { + return 2 * (pos & self->window_mask_) + 1; +} + +/* Stores the hash of the next 4 bytes and in a single tree-traversal, the + hash bucket's binary tree is searched for matches and is re-rooted at the + current position. + + If less than MAX_TREE_COMP_LENGTH data is available, the hash bucket of the + current position is searched for matches, but the state of the hash table + is not changed, since we can not know the final sorting order of the + current (incomplete) sequence. + + This function must be called with increasing cur_ix positions. */ +static BROTLI_INLINE BackwardMatch* FN(StoreAndFindMatches)( + HashToBinaryTree* self, const uint8_t* const BROTLI_RESTRICT data, + const size_t cur_ix, const size_t ring_buffer_mask, const size_t max_length, + const size_t max_backward, size_t* const BROTLI_RESTRICT best_len, + BackwardMatch* BROTLI_RESTRICT matches) { + const size_t cur_ix_masked = cur_ix & ring_buffer_mask; + const size_t max_comp_len = + BROTLI_MIN(size_t, max_length, MAX_TREE_COMP_LENGTH); + const BROTLI_BOOL should_reroot_tree = + TO_BROTLI_BOOL(max_length >= MAX_TREE_COMP_LENGTH); + const uint32_t key = FN(HashBytes)(&data[cur_ix_masked]); + uint32_t* forest = FN(Forest)(self); + size_t prev_ix = self->buckets_[key]; + /* The forest index of the rightmost node of the left subtree of the new + root, updated as we traverse and re-root the tree of the hash bucket. */ + size_t node_left = FN(LeftChildIndex)(self, cur_ix); + /* The forest index of the leftmost node of the right subtree of the new + root, updated as we traverse and re-root the tree of the hash bucket. */ + size_t node_right = FN(RightChildIndex)(self, cur_ix); + /* The match length of the rightmost node of the left subtree of the new + root, updated as we traverse and re-root the tree of the hash bucket. */ + size_t best_len_left = 0; + /* The match length of the leftmost node of the right subtree of the new + root, updated as we traverse and re-root the tree of the hash bucket. */ + size_t best_len_right = 0; + size_t depth_remaining; + if (should_reroot_tree) { + self->buckets_[key] = (uint32_t)cur_ix; + } + for (depth_remaining = MAX_TREE_SEARCH_DEPTH; ; --depth_remaining) { + const size_t backward = cur_ix - prev_ix; + const size_t prev_ix_masked = prev_ix & ring_buffer_mask; + if (backward == 0 || backward > max_backward || depth_remaining == 0) { + if (should_reroot_tree) { + forest[node_left] = self->invalid_pos_; + forest[node_right] = self->invalid_pos_; + } + break; + } + { + const size_t cur_len = BROTLI_MIN(size_t, best_len_left, best_len_right); + size_t len; + BROTLI_DCHECK(cur_len <= MAX_TREE_COMP_LENGTH); + len = cur_len + + FindMatchLengthWithLimit(&data[cur_ix_masked + cur_len], + &data[prev_ix_masked + cur_len], + max_length - cur_len); + BROTLI_DCHECK( + 0 == memcmp(&data[cur_ix_masked], &data[prev_ix_masked], len)); + if (matches && len > *best_len) { + *best_len = len; + InitBackwardMatch(matches++, backward, len); + } + if (len >= max_comp_len) { + if (should_reroot_tree) { + forest[node_left] = forest[FN(LeftChildIndex)(self, prev_ix)]; + forest[node_right] = forest[FN(RightChildIndex)(self, prev_ix)]; + } + break; + } + if (data[cur_ix_masked + len] > data[prev_ix_masked + len]) { + best_len_left = len; + if (should_reroot_tree) { + forest[node_left] = (uint32_t)prev_ix; + } + node_left = FN(RightChildIndex)(self, prev_ix); + prev_ix = forest[node_left]; + } else { + best_len_right = len; + if (should_reroot_tree) { + forest[node_right] = (uint32_t)prev_ix; + } + node_right = FN(LeftChildIndex)(self, prev_ix); + prev_ix = forest[node_right]; + } + } + } + return matches; +} + +/* Finds all backward matches of &data[cur_ix & ring_buffer_mask] up to the + length of max_length and stores the position cur_ix in the hash table. + + Sets *num_matches to the number of matches found, and stores the found + matches in matches[0] to matches[*num_matches - 1]. The matches will be + sorted by strictly increasing length and (non-strictly) increasing + distance. */ +static BROTLI_INLINE size_t FN(FindAllMatches)(HasherHandle handle, + const BrotliEncoderDictionary* dictionary, const uint8_t* data, + const size_t ring_buffer_mask, const size_t cur_ix, + const size_t max_length, const size_t max_backward, + const size_t gap, const BrotliEncoderParams* params, + BackwardMatch* matches) { + BackwardMatch* const orig_matches = matches; + const size_t cur_ix_masked = cur_ix & ring_buffer_mask; + size_t best_len = 1; + const size_t short_match_max_backward = + params->quality != HQ_ZOPFLIFICATION_QUALITY ? 16 : 64; + size_t stop = cur_ix - short_match_max_backward; + uint32_t dict_matches[BROTLI_MAX_STATIC_DICTIONARY_MATCH_LEN + 1]; + size_t i; + if (cur_ix < short_match_max_backward) { stop = 0; } + for (i = cur_ix - 1; i > stop && best_len <= 2; --i) { + size_t prev_ix = i; + const size_t backward = cur_ix - prev_ix; + if (BROTLI_PREDICT_FALSE(backward > max_backward)) { + break; + } + prev_ix &= ring_buffer_mask; + if (data[cur_ix_masked] != data[prev_ix] || + data[cur_ix_masked + 1] != data[prev_ix + 1]) { + continue; + } + { + const size_t len = + FindMatchLengthWithLimit(&data[prev_ix], &data[cur_ix_masked], + max_length); + if (len > best_len) { + best_len = len; + InitBackwardMatch(matches++, backward, len); + } + } + } + if (best_len < max_length) { + matches = FN(StoreAndFindMatches)(FN(Self)(handle), data, cur_ix, + ring_buffer_mask, max_length, max_backward, &best_len, matches); + } + for (i = 0; i <= BROTLI_MAX_STATIC_DICTIONARY_MATCH_LEN; ++i) { + dict_matches[i] = kInvalidMatch; + } + { + size_t minlen = BROTLI_MAX(size_t, 4, best_len + 1); + if (BrotliFindAllStaticDictionaryMatches(dictionary, + &data[cur_ix_masked], minlen, max_length, &dict_matches[0])) { + size_t maxlen = BROTLI_MIN( + size_t, BROTLI_MAX_STATIC_DICTIONARY_MATCH_LEN, max_length); + size_t l; + for (l = minlen; l <= maxlen; ++l) { + uint32_t dict_id = dict_matches[l]; + if (dict_id < kInvalidMatch) { + size_t distance = max_backward + gap + (dict_id >> 5) + 1; + if (distance <= params->dist.max_distance) { + InitDictionaryBackwardMatch(matches++, distance, l, dict_id & 31); + } + } + } + } + } + return (size_t)(matches - orig_matches); +} + +/* Stores the hash of the next 4 bytes and re-roots the binary tree at the + current sequence, without returning any matches. + REQUIRES: ix + MAX_TREE_COMP_LENGTH <= end-of-current-block */ +static BROTLI_INLINE void FN(Store)(HasherHandle handle, const uint8_t* data, + const size_t mask, const size_t ix) { + HashToBinaryTree* self = FN(Self)(handle); + /* Maximum distance is window size - 16, see section 9.1. of the spec. */ + const size_t max_backward = self->window_mask_ - BROTLI_WINDOW_GAP + 1; + FN(StoreAndFindMatches)(self, data, ix, mask, MAX_TREE_COMP_LENGTH, + max_backward, NULL, NULL); +} + +static BROTLI_INLINE void FN(StoreRange)(HasherHandle handle, + const uint8_t* data, const size_t mask, const size_t ix_start, + const size_t ix_end) { + size_t i = ix_start; + size_t j = ix_start; + if (ix_start + 63 <= ix_end) { + i = ix_end - 63; + } + if (ix_start + 512 <= i) { + for (; j < i; j += 8) { + FN(Store)(handle, data, mask, j); + } + } + for (; i < ix_end; ++i) { + FN(Store)(handle, data, mask, i); + } +} + +static BROTLI_INLINE void FN(StitchToPreviousBlock)(HasherHandle handle, + size_t num_bytes, size_t position, const uint8_t* ringbuffer, + size_t ringbuffer_mask) { + HashToBinaryTree* self = FN(Self)(handle); + if (num_bytes >= FN(HashTypeLength)() - 1 && + position >= MAX_TREE_COMP_LENGTH) { + /* Store the last `MAX_TREE_COMP_LENGTH - 1` positions in the hasher. + These could not be calculated before, since they require knowledge + of both the previous and the current block. */ + const size_t i_start = position - MAX_TREE_COMP_LENGTH + 1; + const size_t i_end = BROTLI_MIN(size_t, position, i_start + num_bytes); + size_t i; + for (i = i_start; i < i_end; ++i) { + /* Maximum distance is window size - 16, see section 9.1. of the spec. + Furthermore, we have to make sure that we don't look further back + from the start of the next block than the window size, otherwise we + could access already overwritten areas of the ring-buffer. */ + const size_t max_backward = + self->window_mask_ - BROTLI_MAX(size_t, + BROTLI_WINDOW_GAP - 1, + position - i); + /* We know that i + MAX_TREE_COMP_LENGTH <= position + num_bytes, i.e. the + end of the current block and that we have at least + MAX_TREE_COMP_LENGTH tail in the ring-buffer. */ + FN(StoreAndFindMatches)(self, ringbuffer, i, ringbuffer_mask, + MAX_TREE_COMP_LENGTH, max_backward, NULL, NULL); + } + } +} + +#undef BUCKET_SIZE + +#undef HashToBinaryTree diff --git a/modules/brotli/enc/histogram.c b/modules/brotli/enc/histogram.c new file mode 100644 index 000000000..6da2ff6bb --- /dev/null +++ b/modules/brotli/enc/histogram.c @@ -0,0 +1,100 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Build per-context histograms of literals, commands and distance codes. */ + +#include "./histogram.h" + +#include "../common/context.h" +#include "./block_splitter.h" +#include "./command.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +typedef struct BlockSplitIterator { + const BlockSplit* split_; /* Not owned. */ + size_t idx_; + size_t type_; + size_t length_; +} BlockSplitIterator; + +static void InitBlockSplitIterator(BlockSplitIterator* self, + const BlockSplit* split) { + self->split_ = split; + self->idx_ = 0; + self->type_ = 0; + self->length_ = split->lengths ? split->lengths[0] : 0; +} + +static void BlockSplitIteratorNext(BlockSplitIterator* self) { + if (self->length_ == 0) { + ++self->idx_; + self->type_ = self->split_->types[self->idx_]; + self->length_ = self->split_->lengths[self->idx_]; + } + --self->length_; +} + +void BrotliBuildHistogramsWithContext( + const Command* cmds, const size_t num_commands, + const BlockSplit* literal_split, const BlockSplit* insert_and_copy_split, + const BlockSplit* dist_split, const uint8_t* ringbuffer, size_t start_pos, + size_t mask, uint8_t prev_byte, uint8_t prev_byte2, + const ContextType* context_modes, HistogramLiteral* literal_histograms, + HistogramCommand* insert_and_copy_histograms, + HistogramDistance* copy_dist_histograms) { + size_t pos = start_pos; + BlockSplitIterator literal_it; + BlockSplitIterator insert_and_copy_it; + BlockSplitIterator dist_it; + size_t i; + + InitBlockSplitIterator(&literal_it, literal_split); + InitBlockSplitIterator(&insert_and_copy_it, insert_and_copy_split); + InitBlockSplitIterator(&dist_it, dist_split); + for (i = 0; i < num_commands; ++i) { + const Command* cmd = &cmds[i]; + size_t j; + BlockSplitIteratorNext(&insert_and_copy_it); + HistogramAddCommand(&insert_and_copy_histograms[insert_and_copy_it.type_], + cmd->cmd_prefix_); + /* TODO: unwrap iterator blocks. */ + for (j = cmd->insert_len_; j != 0; --j) { + size_t context; + BlockSplitIteratorNext(&literal_it); + context = literal_it.type_; + if (context_modes) { + ContextLut lut = BROTLI_CONTEXT_LUT(context_modes[context]); + context = (context << BROTLI_LITERAL_CONTEXT_BITS) + + BROTLI_CONTEXT(prev_byte, prev_byte2, lut); + } + HistogramAddLiteral(&literal_histograms[context], + ringbuffer[pos & mask]); + prev_byte2 = prev_byte; + prev_byte = ringbuffer[pos & mask]; + ++pos; + } + pos += CommandCopyLen(cmd); + if (CommandCopyLen(cmd)) { + prev_byte2 = ringbuffer[(pos - 2) & mask]; + prev_byte = ringbuffer[(pos - 1) & mask]; + if (cmd->cmd_prefix_ >= 128) { + size_t context; + BlockSplitIteratorNext(&dist_it); + context = (dist_it.type_ << BROTLI_DISTANCE_CONTEXT_BITS) + + CommandDistanceContext(cmd); + HistogramAddDistance(©_dist_histograms[context], + cmd->dist_prefix_ & 0x3FF); + } + } + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/histogram.h b/modules/brotli/enc/histogram.h new file mode 100644 index 000000000..42af3c3f9 --- /dev/null +++ b/modules/brotli/enc/histogram.h @@ -0,0 +1,63 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Models the histograms of literals, commands and distance codes. */ + +#ifndef BROTLI_ENC_HISTOGRAM_H_ +#define BROTLI_ENC_HISTOGRAM_H_ + +#include <string.h> /* memset */ + +#include "../common/constants.h" +#include "../common/context.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./block_splitter.h" +#include "./command.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* The distance symbols effectively used by "Large Window Brotli" (32-bit). */ +#define BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS 544 + +#define FN(X) X ## Literal +#define DATA_SIZE BROTLI_NUM_LITERAL_SYMBOLS +#define DataType uint8_t +#include "./histogram_inc.h" /* NOLINT(build/include) */ +#undef DataType +#undef DATA_SIZE +#undef FN + +#define FN(X) X ## Command +#define DataType uint16_t +#define DATA_SIZE BROTLI_NUM_COMMAND_SYMBOLS +#include "./histogram_inc.h" /* NOLINT(build/include) */ +#undef DATA_SIZE +#undef FN + +#define FN(X) X ## Distance +#define DATA_SIZE BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS +#include "./histogram_inc.h" /* NOLINT(build/include) */ +#undef DataType +#undef DATA_SIZE +#undef FN + +BROTLI_INTERNAL void BrotliBuildHistogramsWithContext( + const Command* cmds, const size_t num_commands, + const BlockSplit* literal_split, const BlockSplit* insert_and_copy_split, + const BlockSplit* dist_split, const uint8_t* ringbuffer, size_t pos, + size_t mask, uint8_t prev_byte, uint8_t prev_byte2, + const ContextType* context_modes, HistogramLiteral* literal_histograms, + HistogramCommand* insert_and_copy_histograms, + HistogramDistance* copy_dist_histograms); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_HISTOGRAM_H_ */ diff --git a/modules/brotli/enc/histogram_inc.h b/modules/brotli/enc/histogram_inc.h new file mode 100644 index 000000000..50eaf7468 --- /dev/null +++ b/modules/brotli/enc/histogram_inc.h @@ -0,0 +1,51 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: Histogram, DATA_SIZE, DataType */ + +/* A simple container for histograms of data in blocks. */ + +typedef struct FN(Histogram) { + uint32_t data_[DATA_SIZE]; + size_t total_count_; + double bit_cost_; +} FN(Histogram); + +static BROTLI_INLINE void FN(HistogramClear)(FN(Histogram)* self) { + memset(self->data_, 0, sizeof(self->data_)); + self->total_count_ = 0; + self->bit_cost_ = HUGE_VAL; +} + +static BROTLI_INLINE void FN(ClearHistograms)( + FN(Histogram)* array, size_t length) { + size_t i; + for (i = 0; i < length; ++i) FN(HistogramClear)(array + i); +} + +static BROTLI_INLINE void FN(HistogramAdd)(FN(Histogram)* self, size_t val) { + ++self->data_[val]; + ++self->total_count_; +} + +static BROTLI_INLINE void FN(HistogramAddVector)(FN(Histogram)* self, + const DataType* p, size_t n) { + self->total_count_ += n; + n += 1; + while (--n) ++self->data_[*p++]; +} + +static BROTLI_INLINE void FN(HistogramAddHistogram)(FN(Histogram)* self, + const FN(Histogram)* v) { + size_t i; + self->total_count_ += v->total_count_; + for (i = 0; i < DATA_SIZE; ++i) { + self->data_[i] += v->data_[i]; + } +} + +static BROTLI_INLINE size_t FN(HistogramDataSize)(void) { return DATA_SIZE; } diff --git a/modules/brotli/enc/literal_cost.c b/modules/brotli/enc/literal_cost.c new file mode 100644 index 000000000..c231100e3 --- /dev/null +++ b/modules/brotli/enc/literal_cost.c @@ -0,0 +1,175 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Literal cost model to allow backward reference replacement to be efficient. +*/ + +#include "./literal_cost.h" + +#include "../common/platform.h" +#include <brotli/types.h> +#include "./fast_log.h" +#include "./utf8_util.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static size_t UTF8Position(size_t last, size_t c, size_t clamp) { + if (c < 128) { + return 0; /* Next one is the 'Byte 1' again. */ + } else if (c >= 192) { /* Next one is the 'Byte 2' of utf-8 encoding. */ + return BROTLI_MIN(size_t, 1, clamp); + } else { + /* Let's decide over the last byte if this ends the sequence. */ + if (last < 0xE0) { + return 0; /* Completed two or three byte coding. */ + } else { /* Next one is the 'Byte 3' of utf-8 encoding. */ + return BROTLI_MIN(size_t, 2, clamp); + } + } +} + +static size_t DecideMultiByteStatsLevel(size_t pos, size_t len, size_t mask, + const uint8_t* data) { + size_t counts[3] = { 0 }; + size_t max_utf8 = 1; /* should be 2, but 1 compresses better. */ + size_t last_c = 0; + size_t i; + for (i = 0; i < len; ++i) { + size_t c = data[(pos + i) & mask]; + ++counts[UTF8Position(last_c, c, 2)]; + last_c = c; + } + if (counts[2] < 500) { + max_utf8 = 1; + } + if (counts[1] + counts[2] < 25) { + max_utf8 = 0; + } + return max_utf8; +} + +static void EstimateBitCostsForLiteralsUTF8(size_t pos, size_t len, size_t mask, + const uint8_t* data, float* cost) { + /* max_utf8 is 0 (normal ASCII single byte modeling), + 1 (for 2-byte UTF-8 modeling), or 2 (for 3-byte UTF-8 modeling). */ + const size_t max_utf8 = DecideMultiByteStatsLevel(pos, len, mask, data); + size_t histogram[3][256] = { { 0 } }; + size_t window_half = 495; + size_t in_window = BROTLI_MIN(size_t, window_half, len); + size_t in_window_utf8[3] = { 0 }; + + size_t i; + { /* Bootstrap histograms. */ + size_t last_c = 0; + size_t utf8_pos = 0; + for (i = 0; i < in_window; ++i) { + size_t c = data[(pos + i) & mask]; + ++histogram[utf8_pos][c]; + ++in_window_utf8[utf8_pos]; + utf8_pos = UTF8Position(last_c, c, max_utf8); + last_c = c; + } + } + + /* Compute bit costs with sliding window. */ + for (i = 0; i < len; ++i) { + if (i >= window_half) { + /* Remove a byte in the past. */ + size_t c = + i < window_half + 1 ? 0 : data[(pos + i - window_half - 1) & mask]; + size_t last_c = + i < window_half + 2 ? 0 : data[(pos + i - window_half - 2) & mask]; + size_t utf8_pos2 = UTF8Position(last_c, c, max_utf8); + --histogram[utf8_pos2][data[(pos + i - window_half) & mask]]; + --in_window_utf8[utf8_pos2]; + } + if (i + window_half < len) { + /* Add a byte in the future. */ + size_t c = data[(pos + i + window_half - 1) & mask]; + size_t last_c = data[(pos + i + window_half - 2) & mask]; + size_t utf8_pos2 = UTF8Position(last_c, c, max_utf8); + ++histogram[utf8_pos2][data[(pos + i + window_half) & mask]]; + ++in_window_utf8[utf8_pos2]; + } + { + size_t c = i < 1 ? 0 : data[(pos + i - 1) & mask]; + size_t last_c = i < 2 ? 0 : data[(pos + i - 2) & mask]; + size_t utf8_pos = UTF8Position(last_c, c, max_utf8); + size_t masked_pos = (pos + i) & mask; + size_t histo = histogram[utf8_pos][data[masked_pos]]; + double lit_cost; + if (histo == 0) { + histo = 1; + } + lit_cost = FastLog2(in_window_utf8[utf8_pos]) - FastLog2(histo); + lit_cost += 0.02905; + if (lit_cost < 1.0) { + lit_cost *= 0.5; + lit_cost += 0.5; + } + /* Make the first bytes more expensive -- seems to help, not sure why. + Perhaps because the entropy source is changing its properties + rapidly in the beginning of the file, perhaps because the beginning + of the data is a statistical "anomaly". */ + if (i < 2000) { + lit_cost += 0.7 - ((double)(2000 - i) / 2000.0 * 0.35); + } + cost[i] = (float)lit_cost; + } + } +} + +void BrotliEstimateBitCostsForLiterals(size_t pos, size_t len, size_t mask, + const uint8_t* data, float* cost) { + if (BrotliIsMostlyUTF8(data, pos, mask, len, kMinUTF8Ratio)) { + EstimateBitCostsForLiteralsUTF8(pos, len, mask, data, cost); + return; + } else { + size_t histogram[256] = { 0 }; + size_t window_half = 2000; + size_t in_window = BROTLI_MIN(size_t, window_half, len); + + /* Bootstrap histogram. */ + size_t i; + for (i = 0; i < in_window; ++i) { + ++histogram[data[(pos + i) & mask]]; + } + + /* Compute bit costs with sliding window. */ + for (i = 0; i < len; ++i) { + size_t histo; + if (i >= window_half) { + /* Remove a byte in the past. */ + --histogram[data[(pos + i - window_half) & mask]]; + --in_window; + } + if (i + window_half < len) { + /* Add a byte in the future. */ + ++histogram[data[(pos + i + window_half) & mask]]; + ++in_window; + } + histo = histogram[data[(pos + i) & mask]]; + if (histo == 0) { + histo = 1; + } + { + double lit_cost = FastLog2(in_window) - FastLog2(histo); + lit_cost += 0.029; + if (lit_cost < 1.0) { + lit_cost *= 0.5; + lit_cost += 0.5; + } + cost[i] = (float)lit_cost; + } + } + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/literal_cost.h b/modules/brotli/enc/literal_cost.h new file mode 100644 index 000000000..8f53f39d3 --- /dev/null +++ b/modules/brotli/enc/literal_cost.h @@ -0,0 +1,30 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Literal cost model to allow backward reference replacement to be efficient. +*/ + +#ifndef BROTLI_ENC_LITERAL_COST_H_ +#define BROTLI_ENC_LITERAL_COST_H_ + +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* Estimates how many bits the literals in the interval [pos, pos + len) in the + ring-buffer (data, mask) will take entropy coded and writes these estimates + to the cost[0..len) array. */ +BROTLI_INTERNAL void BrotliEstimateBitCostsForLiterals( + size_t pos, size_t len, size_t mask, const uint8_t* data, float* cost); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_LITERAL_COST_H_ */ diff --git a/modules/brotli/enc/memory.c b/modules/brotli/enc/memory.c new file mode 100644 index 000000000..f6ed7e3cb --- /dev/null +++ b/modules/brotli/enc/memory.c @@ -0,0 +1,170 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Algorithms for distributing the literals and commands of a metablock between + block types and contexts. */ + +#include "./memory.h" + +#include <stdlib.h> /* exit, free, malloc */ +#include <string.h> /* memcpy */ + +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define MAX_PERM_ALLOCATED 128 +#define MAX_NEW_ALLOCATED 64 +#define MAX_NEW_FREED 64 + +#define PERM_ALLOCATED_OFFSET 0 +#define NEW_ALLOCATED_OFFSET MAX_PERM_ALLOCATED +#define NEW_FREED_OFFSET (MAX_PERM_ALLOCATED + MAX_NEW_ALLOCATED) + +void BrotliInitMemoryManager( + MemoryManager* m, brotli_alloc_func alloc_func, brotli_free_func free_func, + void* opaque) { + if (!alloc_func) { + m->alloc_func = BrotliDefaultAllocFunc; + m->free_func = BrotliDefaultFreeFunc; + m->opaque = 0; + } else { + m->alloc_func = alloc_func; + m->free_func = free_func; + m->opaque = opaque; + } +#if !defined(BROTLI_ENCODER_EXIT_ON_OOM) + m->is_oom = BROTLI_FALSE; + m->perm_allocated = 0; + m->new_allocated = 0; + m->new_freed = 0; +#endif /* BROTLI_ENCODER_EXIT_ON_OOM */ +} + +#if defined(BROTLI_ENCODER_EXIT_ON_OOM) + +void* BrotliAllocate(MemoryManager* m, size_t n) { + void* result = m->alloc_func(m->opaque, n); + if (!result) exit(EXIT_FAILURE); + return result; +} + +void BrotliFree(MemoryManager* m, void* p) { + m->free_func(m->opaque, p); +} + +void BrotliWipeOutMemoryManager(MemoryManager* m) { + BROTLI_UNUSED(m); +} + +#else /* BROTLI_ENCODER_EXIT_ON_OOM */ + +static void SortPointers(void** items, const size_t n) { + /* Shell sort. */ + static const size_t gaps[] = {23, 10, 4, 1}; + int g = 0; + for (; g < 4; ++g) { + size_t gap = gaps[g]; + size_t i; + for (i = gap; i < n; ++i) { + size_t j = i; + void* tmp = items[i]; + for (; j >= gap && tmp < items[j - gap]; j -= gap) { + items[j] = items[j - gap]; + } + items[j] = tmp; + } + } +} + +static size_t Annihilate(void** a, size_t a_len, void** b, size_t b_len) { + size_t a_read_index = 0; + size_t b_read_index = 0; + size_t a_write_index = 0; + size_t b_write_index = 0; + size_t annihilated = 0; + while (a_read_index < a_len && b_read_index < b_len) { + if (a[a_read_index] == b[b_read_index]) { + a_read_index++; + b_read_index++; + annihilated++; + } else if (a[a_read_index] < b[b_read_index]) { + a[a_write_index++] = a[a_read_index++]; + } else { + b[b_write_index++] = b[b_read_index++]; + } + } + while (a_read_index < a_len) a[a_write_index++] = a[a_read_index++]; + while (b_read_index < b_len) b[b_write_index++] = b[b_read_index++]; + return annihilated; +} + +static void CollectGarbagePointers(MemoryManager* m) { + size_t annihilated; + SortPointers(m->pointers + NEW_ALLOCATED_OFFSET, m->new_allocated); + SortPointers(m->pointers + NEW_FREED_OFFSET, m->new_freed); + annihilated = Annihilate( + m->pointers + NEW_ALLOCATED_OFFSET, m->new_allocated, + m->pointers + NEW_FREED_OFFSET, m->new_freed); + m->new_allocated -= annihilated; + m->new_freed -= annihilated; + + if (m->new_freed != 0) { + annihilated = Annihilate( + m->pointers + PERM_ALLOCATED_OFFSET, m->perm_allocated, + m->pointers + NEW_FREED_OFFSET, m->new_freed); + m->perm_allocated -= annihilated; + m->new_freed -= annihilated; + BROTLI_DCHECK(m->new_freed == 0); + } + + if (m->new_allocated != 0) { + BROTLI_DCHECK(m->perm_allocated + m->new_allocated <= MAX_PERM_ALLOCATED); + memcpy(m->pointers + PERM_ALLOCATED_OFFSET + m->perm_allocated, + m->pointers + NEW_ALLOCATED_OFFSET, + sizeof(void*) * m->new_allocated); + m->perm_allocated += m->new_allocated; + m->new_allocated = 0; + SortPointers(m->pointers + PERM_ALLOCATED_OFFSET, m->perm_allocated); + } +} + +void* BrotliAllocate(MemoryManager* m, size_t n) { + void* result = m->alloc_func(m->opaque, n); + if (!result) { + m->is_oom = BROTLI_TRUE; + return NULL; + } + if (m->new_allocated == MAX_NEW_ALLOCATED) CollectGarbagePointers(m); + m->pointers[NEW_ALLOCATED_OFFSET + (m->new_allocated++)] = result; + return result; +} + +void BrotliFree(MemoryManager* m, void* p) { + if (!p) return; + m->free_func(m->opaque, p); + if (m->new_freed == MAX_NEW_FREED) CollectGarbagePointers(m); + m->pointers[NEW_FREED_OFFSET + (m->new_freed++)] = p; +} + +void BrotliWipeOutMemoryManager(MemoryManager* m) { + size_t i; + CollectGarbagePointers(m); + /* Now all unfreed pointers are in perm-allocated list. */ + for (i = 0; i < m->perm_allocated; ++i) { + m->free_func(m->opaque, m->pointers[PERM_ALLOCATED_OFFSET + i]); + } + m->perm_allocated = 0; +} + +#endif /* BROTLI_ENCODER_EXIT_ON_OOM */ + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/memory.h b/modules/brotli/enc/memory.h new file mode 100644 index 000000000..ab928d019 --- /dev/null +++ b/modules/brotli/enc/memory.h @@ -0,0 +1,102 @@ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Macros for memory management. */ + +#ifndef BROTLI_ENC_MEMORY_H_ +#define BROTLI_ENC_MEMORY_H_ + +#include <string.h> /* memcpy */ + +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#if !defined(BROTLI_ENCODER_CLEANUP_ON_OOM) && \ + !defined(BROTLI_ENCODER_EXIT_ON_OOM) +#define BROTLI_ENCODER_EXIT_ON_OOM +#endif + +typedef struct MemoryManager { + brotli_alloc_func alloc_func; + brotli_free_func free_func; + void* opaque; +#if !defined(BROTLI_ENCODER_EXIT_ON_OOM) + BROTLI_BOOL is_oom; + size_t perm_allocated; + size_t new_allocated; + size_t new_freed; + void* pointers[256]; +#endif /* BROTLI_ENCODER_EXIT_ON_OOM */ +} MemoryManager; + +BROTLI_INTERNAL void BrotliInitMemoryManager( + MemoryManager* m, brotli_alloc_func alloc_func, brotli_free_func free_func, + void* opaque); + +BROTLI_INTERNAL void* BrotliAllocate(MemoryManager* m, size_t n); +#define BROTLI_ALLOC(M, T, N) \ + ((N) > 0 ? ((T*)BrotliAllocate((M), (N) * sizeof(T))) : NULL) + +BROTLI_INTERNAL void BrotliFree(MemoryManager* m, void* p); +#define BROTLI_FREE(M, P) { \ + BrotliFree((M), (P)); \ + P = NULL; \ +} + +#if defined(BROTLI_ENCODER_EXIT_ON_OOM) +#define BROTLI_IS_OOM(M) (!!0) +#else /* BROTLI_ENCODER_EXIT_ON_OOM */ +#define BROTLI_IS_OOM(M) (!!(M)->is_oom) +#endif /* BROTLI_ENCODER_EXIT_ON_OOM */ + +BROTLI_INTERNAL void BrotliWipeOutMemoryManager(MemoryManager* m); + +/* +Dynamically grows array capacity to at least the requested size +M: MemoryManager +T: data type +A: array +C: capacity +R: requested size +*/ +#define BROTLI_ENSURE_CAPACITY(M, T, A, C, R) { \ + if (C < (R)) { \ + size_t _new_size = (C == 0) ? (R) : C; \ + T* new_array; \ + while (_new_size < (R)) _new_size *= 2; \ + new_array = BROTLI_ALLOC((M), T, _new_size); \ + if (!BROTLI_IS_OOM(M) && C != 0) \ + memcpy(new_array, A, C * sizeof(T)); \ + BROTLI_FREE((M), A); \ + A = new_array; \ + C = _new_size; \ + } \ +} + +/* +Appends value and dynamically grows array capacity when needed +M: MemoryManager +T: data type +A: array +C: array capacity +S: array size +V: value to append +*/ +#define BROTLI_ENSURE_CAPACITY_APPEND(M, T, A, C, S, V) { \ + (S)++; \ + BROTLI_ENSURE_CAPACITY(M, T, A, C, S); \ + A[(S) - 1] = (V); \ +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_MEMORY_H_ */ diff --git a/modules/brotli/enc/metablock.c b/modules/brotli/enc/metablock.c new file mode 100644 index 000000000..4e80044f3 --- /dev/null +++ b/modules/brotli/enc/metablock.c @@ -0,0 +1,667 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Algorithms for distributing the literals and commands of a metablock between + block types and contexts. */ + +#include "./metablock.h" + +#include "../common/constants.h" +#include "../common/context.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./bit_cost.h" +#include "./block_splitter.h" +#include "./cluster.h" +#include "./entropy_encode.h" +#include "./histogram.h" +#include "./memory.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +void BrotliInitDistanceParams(BrotliEncoderParams* params, + uint32_t npostfix, uint32_t ndirect) { + BrotliDistanceParams* dist_params = ¶ms->dist; + uint32_t alphabet_size, max_distance; + + dist_params->distance_postfix_bits = npostfix; + dist_params->num_direct_distance_codes = ndirect; + + alphabet_size = BROTLI_DISTANCE_ALPHABET_SIZE( + npostfix, ndirect, BROTLI_MAX_DISTANCE_BITS); + max_distance = ndirect + (1U << (BROTLI_MAX_DISTANCE_BITS + npostfix + 2)) - + (1U << (npostfix + 2)); + + if (params->large_window) { + static const uint32_t bound[BROTLI_MAX_NPOSTFIX + 1] = {0, 4, 12, 28}; + uint32_t postfix = 1U << npostfix; + alphabet_size = BROTLI_DISTANCE_ALPHABET_SIZE( + npostfix, ndirect, BROTLI_LARGE_MAX_DISTANCE_BITS); + /* The maximum distance is set so that no distance symbol used can encode + a distance larger than BROTLI_MAX_ALLOWED_DISTANCE with all + its extra bits set. */ + if (ndirect < bound[npostfix]) { + max_distance = BROTLI_MAX_ALLOWED_DISTANCE - (bound[npostfix] - ndirect); + } else if (ndirect >= bound[npostfix] + postfix) { + max_distance = (3U << 29) - 4 + (ndirect - bound[npostfix]); + } else { + max_distance = BROTLI_MAX_ALLOWED_DISTANCE; + } + } + + dist_params->alphabet_size = alphabet_size; + dist_params->max_distance = max_distance; +} + +static void RecomputeDistancePrefixes(Command* cmds, + size_t num_commands, + const BrotliDistanceParams* orig_params, + const BrotliDistanceParams* new_params) { + size_t i; + + if (orig_params->distance_postfix_bits == new_params->distance_postfix_bits && + orig_params->num_direct_distance_codes == + new_params->num_direct_distance_codes) { + return; + } + + for (i = 0; i < num_commands; ++i) { + Command* cmd = &cmds[i]; + if (CommandCopyLen(cmd) && cmd->cmd_prefix_ >= 128) { + PrefixEncodeCopyDistance(CommandRestoreDistanceCode(cmd, orig_params), + new_params->num_direct_distance_codes, + new_params->distance_postfix_bits, + &cmd->dist_prefix_, + &cmd->dist_extra_); + } + } +} + +static BROTLI_BOOL ComputeDistanceCost(const Command* cmds, + size_t num_commands, + const BrotliDistanceParams* orig_params, + const BrotliDistanceParams* new_params, + double* cost) { + size_t i; + BROTLI_BOOL equal_params = BROTLI_FALSE; + uint16_t dist_prefix; + uint32_t dist_extra; + double extra_bits = 0.0; + HistogramDistance histo; + HistogramClearDistance(&histo); + + if (orig_params->distance_postfix_bits == new_params->distance_postfix_bits && + orig_params->num_direct_distance_codes == + new_params->num_direct_distance_codes) { + equal_params = BROTLI_TRUE; + } + + for (i = 0; i < num_commands; i++) { + const Command* cmd = &cmds[i]; + if (CommandCopyLen(cmd) && cmd->cmd_prefix_ >= 128) { + if (equal_params) { + dist_prefix = cmd->dist_prefix_; + } else { + uint32_t distance = CommandRestoreDistanceCode(cmd, orig_params); + if (distance > new_params->max_distance) { + return BROTLI_FALSE; + } + PrefixEncodeCopyDistance(distance, + new_params->num_direct_distance_codes, + new_params->distance_postfix_bits, + &dist_prefix, + &dist_extra); + } + HistogramAddDistance(&histo, dist_prefix & 0x3FF); + extra_bits += dist_prefix >> 10; + } + } + + *cost = BrotliPopulationCostDistance(&histo) + extra_bits; + return BROTLI_TRUE; +} + +void BrotliBuildMetaBlock(MemoryManager* m, + const uint8_t* ringbuffer, + const size_t pos, + const size_t mask, + BrotliEncoderParams* params, + uint8_t prev_byte, + uint8_t prev_byte2, + Command* cmds, + size_t num_commands, + ContextType literal_context_mode, + MetaBlockSplit* mb) { + /* Histogram ids need to fit in one byte. */ + static const size_t kMaxNumberOfHistograms = 256; + HistogramDistance* distance_histograms; + HistogramLiteral* literal_histograms; + ContextType* literal_context_modes = NULL; + size_t literal_histograms_size; + size_t distance_histograms_size; + size_t i; + size_t literal_context_multiplier = 1; + uint32_t npostfix; + uint32_t ndirect_msb = 0; + BROTLI_BOOL check_orig = BROTLI_TRUE; + double best_dist_cost = 1e99; + BrotliEncoderParams orig_params = *params; + BrotliEncoderParams new_params = *params; + + for (npostfix = 0; npostfix <= BROTLI_MAX_NPOSTFIX; npostfix++) { + for (; ndirect_msb < 16; ndirect_msb++) { + uint32_t ndirect = ndirect_msb << npostfix; + BROTLI_BOOL skip; + double dist_cost; + BrotliInitDistanceParams(&new_params, npostfix, ndirect); + if (npostfix == orig_params.dist.distance_postfix_bits && + ndirect == orig_params.dist.num_direct_distance_codes) { + check_orig = BROTLI_FALSE; + } + skip = !ComputeDistanceCost( + cmds, num_commands, + &orig_params.dist, &new_params.dist, &dist_cost); + if (skip || (dist_cost > best_dist_cost)) { + break; + } + best_dist_cost = dist_cost; + params->dist = new_params.dist; + } + if (ndirect_msb > 0) ndirect_msb--; + ndirect_msb /= 2; + } + if (check_orig) { + double dist_cost; + ComputeDistanceCost(cmds, num_commands, + &orig_params.dist, &orig_params.dist, &dist_cost); + if (dist_cost < best_dist_cost) { + /* NB: currently unused; uncomment when more param tuning is added. */ + /* best_dist_cost = dist_cost; */ + params->dist = orig_params.dist; + } + } + RecomputeDistancePrefixes(cmds, num_commands, + &orig_params.dist, ¶ms->dist); + + BrotliSplitBlock(m, cmds, num_commands, + ringbuffer, pos, mask, params, + &mb->literal_split, + &mb->command_split, + &mb->distance_split); + if (BROTLI_IS_OOM(m)) return; + + if (!params->disable_literal_context_modeling) { + literal_context_multiplier = 1 << BROTLI_LITERAL_CONTEXT_BITS; + literal_context_modes = + BROTLI_ALLOC(m, ContextType, mb->literal_split.num_types); + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i < mb->literal_split.num_types; ++i) { + literal_context_modes[i] = literal_context_mode; + } + } + + literal_histograms_size = + mb->literal_split.num_types * literal_context_multiplier; + literal_histograms = + BROTLI_ALLOC(m, HistogramLiteral, literal_histograms_size); + if (BROTLI_IS_OOM(m)) return; + ClearHistogramsLiteral(literal_histograms, literal_histograms_size); + + distance_histograms_size = + mb->distance_split.num_types << BROTLI_DISTANCE_CONTEXT_BITS; + distance_histograms = + BROTLI_ALLOC(m, HistogramDistance, distance_histograms_size); + if (BROTLI_IS_OOM(m)) return; + ClearHistogramsDistance(distance_histograms, distance_histograms_size); + + BROTLI_DCHECK(mb->command_histograms == 0); + mb->command_histograms_size = mb->command_split.num_types; + mb->command_histograms = + BROTLI_ALLOC(m, HistogramCommand, mb->command_histograms_size); + if (BROTLI_IS_OOM(m)) return; + ClearHistogramsCommand(mb->command_histograms, mb->command_histograms_size); + + BrotliBuildHistogramsWithContext(cmds, num_commands, + &mb->literal_split, &mb->command_split, &mb->distance_split, + ringbuffer, pos, mask, prev_byte, prev_byte2, literal_context_modes, + literal_histograms, mb->command_histograms, distance_histograms); + BROTLI_FREE(m, literal_context_modes); + + BROTLI_DCHECK(mb->literal_context_map == 0); + mb->literal_context_map_size = + mb->literal_split.num_types << BROTLI_LITERAL_CONTEXT_BITS; + mb->literal_context_map = + BROTLI_ALLOC(m, uint32_t, mb->literal_context_map_size); + if (BROTLI_IS_OOM(m)) return; + + BROTLI_DCHECK(mb->literal_histograms == 0); + mb->literal_histograms_size = mb->literal_context_map_size; + mb->literal_histograms = + BROTLI_ALLOC(m, HistogramLiteral, mb->literal_histograms_size); + if (BROTLI_IS_OOM(m)) return; + + BrotliClusterHistogramsLiteral(m, literal_histograms, literal_histograms_size, + kMaxNumberOfHistograms, mb->literal_histograms, + &mb->literal_histograms_size, mb->literal_context_map); + if (BROTLI_IS_OOM(m)) return; + BROTLI_FREE(m, literal_histograms); + + if (params->disable_literal_context_modeling) { + /* Distribute assignment to all contexts. */ + for (i = mb->literal_split.num_types; i != 0;) { + size_t j = 0; + i--; + for (; j < (1 << BROTLI_LITERAL_CONTEXT_BITS); j++) { + mb->literal_context_map[(i << BROTLI_LITERAL_CONTEXT_BITS) + j] = + mb->literal_context_map[i]; + } + } + } + + BROTLI_DCHECK(mb->distance_context_map == 0); + mb->distance_context_map_size = + mb->distance_split.num_types << BROTLI_DISTANCE_CONTEXT_BITS; + mb->distance_context_map = + BROTLI_ALLOC(m, uint32_t, mb->distance_context_map_size); + if (BROTLI_IS_OOM(m)) return; + + BROTLI_DCHECK(mb->distance_histograms == 0); + mb->distance_histograms_size = mb->distance_context_map_size; + mb->distance_histograms = + BROTLI_ALLOC(m, HistogramDistance, mb->distance_histograms_size); + if (BROTLI_IS_OOM(m)) return; + + BrotliClusterHistogramsDistance(m, distance_histograms, + mb->distance_context_map_size, + kMaxNumberOfHistograms, + mb->distance_histograms, + &mb->distance_histograms_size, + mb->distance_context_map); + if (BROTLI_IS_OOM(m)) return; + BROTLI_FREE(m, distance_histograms); +} + +#define FN(X) X ## Literal +#include "./metablock_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define FN(X) X ## Command +#include "./metablock_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define FN(X) X ## Distance +#include "./metablock_inc.h" /* NOLINT(build/include) */ +#undef FN + +#define BROTLI_MAX_STATIC_CONTEXTS 13 + +/* Greedy block splitter for one block category (literal, command or distance). + Gathers histograms for all context buckets. */ +typedef struct ContextBlockSplitter { + /* Alphabet size of particular block category. */ + size_t alphabet_size_; + size_t num_contexts_; + size_t max_block_types_; + /* We collect at least this many symbols for each block. */ + size_t min_block_size_; + /* We merge histograms A and B if + entropy(A+B) < entropy(A) + entropy(B) + split_threshold_, + where A is the current histogram and B is the histogram of the last or the + second last block type. */ + double split_threshold_; + + size_t num_blocks_; + BlockSplit* split_; /* not owned */ + HistogramLiteral* histograms_; /* not owned */ + size_t* histograms_size_; /* not owned */ + + /* The number of symbols that we want to collect before deciding on whether + or not to merge the block with a previous one or emit a new block. */ + size_t target_block_size_; + /* The number of symbols in the current histogram. */ + size_t block_size_; + /* Offset of the current histogram. */ + size_t curr_histogram_ix_; + /* Offset of the histograms of the previous two block types. */ + size_t last_histogram_ix_[2]; + /* Entropy of the previous two block types. */ + double last_entropy_[2 * BROTLI_MAX_STATIC_CONTEXTS]; + /* The number of times we merged the current block with the last one. */ + size_t merge_last_count_; +} ContextBlockSplitter; + +static void InitContextBlockSplitter( + MemoryManager* m, ContextBlockSplitter* self, size_t alphabet_size, + size_t num_contexts, size_t min_block_size, double split_threshold, + size_t num_symbols, BlockSplit* split, HistogramLiteral** histograms, + size_t* histograms_size) { + size_t max_num_blocks = num_symbols / min_block_size + 1; + size_t max_num_types; + BROTLI_DCHECK(num_contexts <= BROTLI_MAX_STATIC_CONTEXTS); + + self->alphabet_size_ = alphabet_size; + self->num_contexts_ = num_contexts; + self->max_block_types_ = BROTLI_MAX_NUMBER_OF_BLOCK_TYPES / num_contexts; + self->min_block_size_ = min_block_size; + self->split_threshold_ = split_threshold; + self->num_blocks_ = 0; + self->split_ = split; + self->histograms_size_ = histograms_size; + self->target_block_size_ = min_block_size; + self->block_size_ = 0; + self->curr_histogram_ix_ = 0; + self->merge_last_count_ = 0; + + /* We have to allocate one more histogram than the maximum number of block + types for the current histogram when the meta-block is too big. */ + max_num_types = + BROTLI_MIN(size_t, max_num_blocks, self->max_block_types_ + 1); + BROTLI_ENSURE_CAPACITY(m, uint8_t, + split->types, split->types_alloc_size, max_num_blocks); + BROTLI_ENSURE_CAPACITY(m, uint32_t, + split->lengths, split->lengths_alloc_size, max_num_blocks); + if (BROTLI_IS_OOM(m)) return; + split->num_blocks = max_num_blocks; + if (BROTLI_IS_OOM(m)) return; + BROTLI_DCHECK(*histograms == 0); + *histograms_size = max_num_types * num_contexts; + *histograms = BROTLI_ALLOC(m, HistogramLiteral, *histograms_size); + self->histograms_ = *histograms; + if (BROTLI_IS_OOM(m)) return; + /* Clear only current histogram. */ + ClearHistogramsLiteral(&self->histograms_[0], num_contexts); + self->last_histogram_ix_[0] = self->last_histogram_ix_[1] = 0; +} + +/* Does either of three things: + (1) emits the current block with a new block type; + (2) emits the current block with the type of the second last block; + (3) merges the current block with the last block. */ +static void ContextBlockSplitterFinishBlock( + ContextBlockSplitter* self, MemoryManager* m, BROTLI_BOOL is_final) { + BlockSplit* split = self->split_; + const size_t num_contexts = self->num_contexts_; + double* last_entropy = self->last_entropy_; + HistogramLiteral* histograms = self->histograms_; + + if (self->block_size_ < self->min_block_size_) { + self->block_size_ = self->min_block_size_; + } + if (self->num_blocks_ == 0) { + size_t i; + /* Create first block. */ + split->lengths[0] = (uint32_t)self->block_size_; + split->types[0] = 0; + + for (i = 0; i < num_contexts; ++i) { + last_entropy[i] = + BitsEntropy(histograms[i].data_, self->alphabet_size_); + last_entropy[num_contexts + i] = last_entropy[i]; + } + ++self->num_blocks_; + ++split->num_types; + self->curr_histogram_ix_ += num_contexts; + if (self->curr_histogram_ix_ < *self->histograms_size_) { + ClearHistogramsLiteral( + &self->histograms_[self->curr_histogram_ix_], self->num_contexts_); + } + self->block_size_ = 0; + } else if (self->block_size_ > 0) { + /* Try merging the set of histograms for the current block type with the + respective set of histograms for the last and second last block types. + Decide over the split based on the total reduction of entropy across + all contexts. */ + double entropy[BROTLI_MAX_STATIC_CONTEXTS]; + HistogramLiteral* combined_histo = + BROTLI_ALLOC(m, HistogramLiteral, 2 * num_contexts); + double combined_entropy[2 * BROTLI_MAX_STATIC_CONTEXTS]; + double diff[2] = { 0.0 }; + size_t i; + if (BROTLI_IS_OOM(m)) return; + for (i = 0; i < num_contexts; ++i) { + size_t curr_histo_ix = self->curr_histogram_ix_ + i; + size_t j; + entropy[i] = BitsEntropy(histograms[curr_histo_ix].data_, + self->alphabet_size_); + for (j = 0; j < 2; ++j) { + size_t jx = j * num_contexts + i; + size_t last_histogram_ix = self->last_histogram_ix_[j] + i; + combined_histo[jx] = histograms[curr_histo_ix]; + HistogramAddHistogramLiteral(&combined_histo[jx], + &histograms[last_histogram_ix]); + combined_entropy[jx] = BitsEntropy( + &combined_histo[jx].data_[0], self->alphabet_size_); + diff[j] += combined_entropy[jx] - entropy[i] - last_entropy[jx]; + } + } + + if (split->num_types < self->max_block_types_ && + diff[0] > self->split_threshold_ && + diff[1] > self->split_threshold_) { + /* Create new block. */ + split->lengths[self->num_blocks_] = (uint32_t)self->block_size_; + split->types[self->num_blocks_] = (uint8_t)split->num_types; + self->last_histogram_ix_[1] = self->last_histogram_ix_[0]; + self->last_histogram_ix_[0] = split->num_types * num_contexts; + for (i = 0; i < num_contexts; ++i) { + last_entropy[num_contexts + i] = last_entropy[i]; + last_entropy[i] = entropy[i]; + } + ++self->num_blocks_; + ++split->num_types; + self->curr_histogram_ix_ += num_contexts; + if (self->curr_histogram_ix_ < *self->histograms_size_) { + ClearHistogramsLiteral( + &self->histograms_[self->curr_histogram_ix_], self->num_contexts_); + } + self->block_size_ = 0; + self->merge_last_count_ = 0; + self->target_block_size_ = self->min_block_size_; + } else if (diff[1] < diff[0] - 20.0) { + /* Combine this block with second last block. */ + split->lengths[self->num_blocks_] = (uint32_t)self->block_size_; + split->types[self->num_blocks_] = split->types[self->num_blocks_ - 2]; + BROTLI_SWAP(size_t, self->last_histogram_ix_, 0, 1); + for (i = 0; i < num_contexts; ++i) { + histograms[self->last_histogram_ix_[0] + i] = + combined_histo[num_contexts + i]; + last_entropy[num_contexts + i] = last_entropy[i]; + last_entropy[i] = combined_entropy[num_contexts + i]; + HistogramClearLiteral(&histograms[self->curr_histogram_ix_ + i]); + } + ++self->num_blocks_; + self->block_size_ = 0; + self->merge_last_count_ = 0; + self->target_block_size_ = self->min_block_size_; + } else { + /* Combine this block with last block. */ + split->lengths[self->num_blocks_ - 1] += (uint32_t)self->block_size_; + for (i = 0; i < num_contexts; ++i) { + histograms[self->last_histogram_ix_[0] + i] = combined_histo[i]; + last_entropy[i] = combined_entropy[i]; + if (split->num_types == 1) { + last_entropy[num_contexts + i] = last_entropy[i]; + } + HistogramClearLiteral(&histograms[self->curr_histogram_ix_ + i]); + } + self->block_size_ = 0; + if (++self->merge_last_count_ > 1) { + self->target_block_size_ += self->min_block_size_; + } + } + BROTLI_FREE(m, combined_histo); + } + if (is_final) { + *self->histograms_size_ = split->num_types * num_contexts; + split->num_blocks = self->num_blocks_; + } +} + +/* Adds the next symbol to the current block type and context. When the + current block reaches the target size, decides on merging the block. */ +static void ContextBlockSplitterAddSymbol( + ContextBlockSplitter* self, MemoryManager* m, + size_t symbol, size_t context) { + HistogramAddLiteral(&self->histograms_[self->curr_histogram_ix_ + context], + symbol); + ++self->block_size_; + if (self->block_size_ == self->target_block_size_) { + ContextBlockSplitterFinishBlock(self, m, /* is_final = */ BROTLI_FALSE); + if (BROTLI_IS_OOM(m)) return; + } +} + +static void MapStaticContexts(MemoryManager* m, + size_t num_contexts, + const uint32_t* static_context_map, + MetaBlockSplit* mb) { + size_t i; + BROTLI_DCHECK(mb->literal_context_map == 0); + mb->literal_context_map_size = + mb->literal_split.num_types << BROTLI_LITERAL_CONTEXT_BITS; + mb->literal_context_map = + BROTLI_ALLOC(m, uint32_t, mb->literal_context_map_size); + if (BROTLI_IS_OOM(m)) return; + + for (i = 0; i < mb->literal_split.num_types; ++i) { + uint32_t offset = (uint32_t)(i * num_contexts); + size_t j; + for (j = 0; j < (1u << BROTLI_LITERAL_CONTEXT_BITS); ++j) { + mb->literal_context_map[(i << BROTLI_LITERAL_CONTEXT_BITS) + j] = + offset + static_context_map[j]; + } + } +} + +static BROTLI_INLINE void BrotliBuildMetaBlockGreedyInternal( + MemoryManager* m, const uint8_t* ringbuffer, size_t pos, size_t mask, + uint8_t prev_byte, uint8_t prev_byte2, ContextLut literal_context_lut, + const size_t num_contexts, const uint32_t* static_context_map, + const Command* commands, size_t n_commands, MetaBlockSplit* mb) { + union { + BlockSplitterLiteral plain; + ContextBlockSplitter ctx; + } lit_blocks; + BlockSplitterCommand cmd_blocks; + BlockSplitterDistance dist_blocks; + size_t num_literals = 0; + size_t i; + for (i = 0; i < n_commands; ++i) { + num_literals += commands[i].insert_len_; + } + + if (num_contexts == 1) { + InitBlockSplitterLiteral(m, &lit_blocks.plain, 256, 512, 400.0, + num_literals, &mb->literal_split, &mb->literal_histograms, + &mb->literal_histograms_size); + } else { + InitContextBlockSplitter(m, &lit_blocks.ctx, 256, num_contexts, 512, 400.0, + num_literals, &mb->literal_split, &mb->literal_histograms, + &mb->literal_histograms_size); + } + if (BROTLI_IS_OOM(m)) return; + InitBlockSplitterCommand(m, &cmd_blocks, BROTLI_NUM_COMMAND_SYMBOLS, 1024, + 500.0, n_commands, &mb->command_split, &mb->command_histograms, + &mb->command_histograms_size); + if (BROTLI_IS_OOM(m)) return; + InitBlockSplitterDistance(m, &dist_blocks, 64, 512, 100.0, n_commands, + &mb->distance_split, &mb->distance_histograms, + &mb->distance_histograms_size); + if (BROTLI_IS_OOM(m)) return; + + for (i = 0; i < n_commands; ++i) { + const Command cmd = commands[i]; + size_t j; + BlockSplitterAddSymbolCommand(&cmd_blocks, cmd.cmd_prefix_); + for (j = cmd.insert_len_; j != 0; --j) { + uint8_t literal = ringbuffer[pos & mask]; + if (num_contexts == 1) { + BlockSplitterAddSymbolLiteral(&lit_blocks.plain, literal); + } else { + size_t context = + BROTLI_CONTEXT(prev_byte, prev_byte2, literal_context_lut); + ContextBlockSplitterAddSymbol(&lit_blocks.ctx, m, literal, + static_context_map[context]); + if (BROTLI_IS_OOM(m)) return; + } + prev_byte2 = prev_byte; + prev_byte = literal; + ++pos; + } + pos += CommandCopyLen(&cmd); + if (CommandCopyLen(&cmd)) { + prev_byte2 = ringbuffer[(pos - 2) & mask]; + prev_byte = ringbuffer[(pos - 1) & mask]; + if (cmd.cmd_prefix_ >= 128) { + BlockSplitterAddSymbolDistance(&dist_blocks, cmd.dist_prefix_ & 0x3FF); + } + } + } + + if (num_contexts == 1) { + BlockSplitterFinishBlockLiteral( + &lit_blocks.plain, /* is_final = */ BROTLI_TRUE); + } else { + ContextBlockSplitterFinishBlock( + &lit_blocks.ctx, m, /* is_final = */ BROTLI_TRUE); + if (BROTLI_IS_OOM(m)) return; + } + BlockSplitterFinishBlockCommand(&cmd_blocks, /* is_final = */ BROTLI_TRUE); + BlockSplitterFinishBlockDistance(&dist_blocks, /* is_final = */ BROTLI_TRUE); + + if (num_contexts > 1) { + MapStaticContexts(m, num_contexts, static_context_map, mb); + } +} + +void BrotliBuildMetaBlockGreedy(MemoryManager* m, + const uint8_t* ringbuffer, + size_t pos, + size_t mask, + uint8_t prev_byte, + uint8_t prev_byte2, + ContextLut literal_context_lut, + size_t num_contexts, + const uint32_t* static_context_map, + const Command* commands, + size_t n_commands, + MetaBlockSplit* mb) { + if (num_contexts == 1) { + BrotliBuildMetaBlockGreedyInternal(m, ringbuffer, pos, mask, prev_byte, + prev_byte2, literal_context_lut, 1, NULL, commands, n_commands, mb); + } else { + BrotliBuildMetaBlockGreedyInternal(m, ringbuffer, pos, mask, prev_byte, + prev_byte2, literal_context_lut, num_contexts, static_context_map, + commands, n_commands, mb); + } +} + +void BrotliOptimizeHistograms(uint32_t num_distance_codes, + MetaBlockSplit* mb) { + uint8_t good_for_rle[BROTLI_NUM_COMMAND_SYMBOLS]; + size_t i; + for (i = 0; i < mb->literal_histograms_size; ++i) { + BrotliOptimizeHuffmanCountsForRle(256, mb->literal_histograms[i].data_, + good_for_rle); + } + for (i = 0; i < mb->command_histograms_size; ++i) { + BrotliOptimizeHuffmanCountsForRle(BROTLI_NUM_COMMAND_SYMBOLS, + mb->command_histograms[i].data_, + good_for_rle); + } + for (i = 0; i < mb->distance_histograms_size; ++i) { + BrotliOptimizeHuffmanCountsForRle(num_distance_codes, + mb->distance_histograms[i].data_, + good_for_rle); + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/metablock.h b/modules/brotli/enc/metablock.h new file mode 100644 index 000000000..334a79a44 --- /dev/null +++ b/modules/brotli/enc/metablock.h @@ -0,0 +1,105 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Algorithms for distributing the literals and commands of a metablock between + block types and contexts. */ + +#ifndef BROTLI_ENC_METABLOCK_H_ +#define BROTLI_ENC_METABLOCK_H_ + +#include "../common/context.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./block_splitter.h" +#include "./command.h" +#include "./histogram.h" +#include "./memory.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +typedef struct MetaBlockSplit { + BlockSplit literal_split; + BlockSplit command_split; + BlockSplit distance_split; + uint32_t* literal_context_map; + size_t literal_context_map_size; + uint32_t* distance_context_map; + size_t distance_context_map_size; + HistogramLiteral* literal_histograms; + size_t literal_histograms_size; + HistogramCommand* command_histograms; + size_t command_histograms_size; + HistogramDistance* distance_histograms; + size_t distance_histograms_size; +} MetaBlockSplit; + +static BROTLI_INLINE void InitMetaBlockSplit(MetaBlockSplit* mb) { + BrotliInitBlockSplit(&mb->literal_split); + BrotliInitBlockSplit(&mb->command_split); + BrotliInitBlockSplit(&mb->distance_split); + mb->literal_context_map = 0; + mb->literal_context_map_size = 0; + mb->distance_context_map = 0; + mb->distance_context_map_size = 0; + mb->literal_histograms = 0; + mb->literal_histograms_size = 0; + mb->command_histograms = 0; + mb->command_histograms_size = 0; + mb->distance_histograms = 0; + mb->distance_histograms_size = 0; +} + +static BROTLI_INLINE void DestroyMetaBlockSplit( + MemoryManager* m, MetaBlockSplit* mb) { + BrotliDestroyBlockSplit(m, &mb->literal_split); + BrotliDestroyBlockSplit(m, &mb->command_split); + BrotliDestroyBlockSplit(m, &mb->distance_split); + BROTLI_FREE(m, mb->literal_context_map); + BROTLI_FREE(m, mb->distance_context_map); + BROTLI_FREE(m, mb->literal_histograms); + BROTLI_FREE(m, mb->command_histograms); + BROTLI_FREE(m, mb->distance_histograms); +} + +/* Uses the slow shortest-path block splitter and does context clustering. + The distance parameters are dynamically selected based on the commands + which get recomputed under the new distance parameters. The new distance + parameters are stored into *params. */ +BROTLI_INTERNAL void BrotliBuildMetaBlock(MemoryManager* m, + const uint8_t* ringbuffer, + const size_t pos, + const size_t mask, + BrotliEncoderParams* params, + uint8_t prev_byte, + uint8_t prev_byte2, + Command* cmds, + size_t num_commands, + ContextType literal_context_mode, + MetaBlockSplit* mb); + +/* Uses a fast greedy block splitter that tries to merge current block with the + last or the second last block and uses a static context clustering which + is the same for all block types. */ +BROTLI_INTERNAL void BrotliBuildMetaBlockGreedy( + MemoryManager* m, const uint8_t* ringbuffer, size_t pos, size_t mask, + uint8_t prev_byte, uint8_t prev_byte2, ContextLut literal_context_lut, + size_t num_contexts, const uint32_t* static_context_map, + const Command* commands, size_t n_commands, MetaBlockSplit* mb); + +BROTLI_INTERNAL void BrotliOptimizeHistograms(uint32_t num_distance_codes, + MetaBlockSplit* mb); + +BROTLI_INTERNAL void BrotliInitDistanceParams(BrotliEncoderParams* params, + uint32_t npostfix, uint32_t ndirect); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_METABLOCK_H_ */ diff --git a/modules/brotli/enc/metablock_inc.h b/modules/brotli/enc/metablock_inc.h new file mode 100644 index 000000000..dcc9d3c4a --- /dev/null +++ b/modules/brotli/enc/metablock_inc.h @@ -0,0 +1,183 @@ +/* NOLINT(build/header_guard) */ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* template parameters: FN */ + +#define HistogramType FN(Histogram) + +/* Greedy block splitter for one block category (literal, command or distance). +*/ +typedef struct FN(BlockSplitter) { + /* Alphabet size of particular block category. */ + size_t alphabet_size_; + /* We collect at least this many symbols for each block. */ + size_t min_block_size_; + /* We merge histograms A and B if + entropy(A+B) < entropy(A) + entropy(B) + split_threshold_, + where A is the current histogram and B is the histogram of the last or the + second last block type. */ + double split_threshold_; + + size_t num_blocks_; + BlockSplit* split_; /* not owned */ + HistogramType* histograms_; /* not owned */ + size_t* histograms_size_; /* not owned */ + + /* The number of symbols that we want to collect before deciding on whether + or not to merge the block with a previous one or emit a new block. */ + size_t target_block_size_; + /* The number of symbols in the current histogram. */ + size_t block_size_; + /* Offset of the current histogram. */ + size_t curr_histogram_ix_; + /* Offset of the histograms of the previous two block types. */ + size_t last_histogram_ix_[2]; + /* Entropy of the previous two block types. */ + double last_entropy_[2]; + /* The number of times we merged the current block with the last one. */ + size_t merge_last_count_; +} FN(BlockSplitter); + +static void FN(InitBlockSplitter)( + MemoryManager* m, FN(BlockSplitter)* self, size_t alphabet_size, + size_t min_block_size, double split_threshold, size_t num_symbols, + BlockSplit* split, HistogramType** histograms, size_t* histograms_size) { + size_t max_num_blocks = num_symbols / min_block_size + 1; + /* We have to allocate one more histogram than the maximum number of block + types for the current histogram when the meta-block is too big. */ + size_t max_num_types = + BROTLI_MIN(size_t, max_num_blocks, BROTLI_MAX_NUMBER_OF_BLOCK_TYPES + 1); + self->alphabet_size_ = alphabet_size; + self->min_block_size_ = min_block_size; + self->split_threshold_ = split_threshold; + self->num_blocks_ = 0; + self->split_ = split; + self->histograms_size_ = histograms_size; + self->target_block_size_ = min_block_size; + self->block_size_ = 0; + self->curr_histogram_ix_ = 0; + self->merge_last_count_ = 0; + BROTLI_ENSURE_CAPACITY(m, uint8_t, + split->types, split->types_alloc_size, max_num_blocks); + BROTLI_ENSURE_CAPACITY(m, uint32_t, + split->lengths, split->lengths_alloc_size, max_num_blocks); + if (BROTLI_IS_OOM(m)) return; + self->split_->num_blocks = max_num_blocks; + BROTLI_DCHECK(*histograms == 0); + *histograms_size = max_num_types; + *histograms = BROTLI_ALLOC(m, HistogramType, *histograms_size); + self->histograms_ = *histograms; + if (BROTLI_IS_OOM(m)) return; + /* Clear only current histogram. */ + FN(HistogramClear)(&self->histograms_[0]); + self->last_histogram_ix_[0] = self->last_histogram_ix_[1] = 0; +} + +/* Does either of three things: + (1) emits the current block with a new block type; + (2) emits the current block with the type of the second last block; + (3) merges the current block with the last block. */ +static void FN(BlockSplitterFinishBlock)( + FN(BlockSplitter)* self, BROTLI_BOOL is_final) { + BlockSplit* split = self->split_; + double* last_entropy = self->last_entropy_; + HistogramType* histograms = self->histograms_; + self->block_size_ = + BROTLI_MAX(size_t, self->block_size_, self->min_block_size_); + if (self->num_blocks_ == 0) { + /* Create first block. */ + split->lengths[0] = (uint32_t)self->block_size_; + split->types[0] = 0; + last_entropy[0] = + BitsEntropy(histograms[0].data_, self->alphabet_size_); + last_entropy[1] = last_entropy[0]; + ++self->num_blocks_; + ++split->num_types; + ++self->curr_histogram_ix_; + if (self->curr_histogram_ix_ < *self->histograms_size_) + FN(HistogramClear)(&histograms[self->curr_histogram_ix_]); + self->block_size_ = 0; + } else if (self->block_size_ > 0) { + double entropy = BitsEntropy(histograms[self->curr_histogram_ix_].data_, + self->alphabet_size_); + HistogramType combined_histo[2]; + double combined_entropy[2]; + double diff[2]; + size_t j; + for (j = 0; j < 2; ++j) { + size_t last_histogram_ix = self->last_histogram_ix_[j]; + combined_histo[j] = histograms[self->curr_histogram_ix_]; + FN(HistogramAddHistogram)(&combined_histo[j], + &histograms[last_histogram_ix]); + combined_entropy[j] = BitsEntropy( + &combined_histo[j].data_[0], self->alphabet_size_); + diff[j] = combined_entropy[j] - entropy - last_entropy[j]; + } + + if (split->num_types < BROTLI_MAX_NUMBER_OF_BLOCK_TYPES && + diff[0] > self->split_threshold_ && + diff[1] > self->split_threshold_) { + /* Create new block. */ + split->lengths[self->num_blocks_] = (uint32_t)self->block_size_; + split->types[self->num_blocks_] = (uint8_t)split->num_types; + self->last_histogram_ix_[1] = self->last_histogram_ix_[0]; + self->last_histogram_ix_[0] = (uint8_t)split->num_types; + last_entropy[1] = last_entropy[0]; + last_entropy[0] = entropy; + ++self->num_blocks_; + ++split->num_types; + ++self->curr_histogram_ix_; + if (self->curr_histogram_ix_ < *self->histograms_size_) + FN(HistogramClear)(&histograms[self->curr_histogram_ix_]); + self->block_size_ = 0; + self->merge_last_count_ = 0; + self->target_block_size_ = self->min_block_size_; + } else if (diff[1] < diff[0] - 20.0) { + /* Combine this block with second last block. */ + split->lengths[self->num_blocks_] = (uint32_t)self->block_size_; + split->types[self->num_blocks_] = split->types[self->num_blocks_ - 2]; + BROTLI_SWAP(size_t, self->last_histogram_ix_, 0, 1); + histograms[self->last_histogram_ix_[0]] = combined_histo[1]; + last_entropy[1] = last_entropy[0]; + last_entropy[0] = combined_entropy[1]; + ++self->num_blocks_; + self->block_size_ = 0; + FN(HistogramClear)(&histograms[self->curr_histogram_ix_]); + self->merge_last_count_ = 0; + self->target_block_size_ = self->min_block_size_; + } else { + /* Combine this block with last block. */ + split->lengths[self->num_blocks_ - 1] += (uint32_t)self->block_size_; + histograms[self->last_histogram_ix_[0]] = combined_histo[0]; + last_entropy[0] = combined_entropy[0]; + if (split->num_types == 1) { + last_entropy[1] = last_entropy[0]; + } + self->block_size_ = 0; + FN(HistogramClear)(&histograms[self->curr_histogram_ix_]); + if (++self->merge_last_count_ > 1) { + self->target_block_size_ += self->min_block_size_; + } + } + } + if (is_final) { + *self->histograms_size_ = split->num_types; + split->num_blocks = self->num_blocks_; + } +} + +/* Adds the next symbol to the current histogram. When the current histogram + reaches the target size, decides on merging the block. */ +static void FN(BlockSplitterAddSymbol)(FN(BlockSplitter)* self, size_t symbol) { + FN(HistogramAdd)(&self->histograms_[self->curr_histogram_ix_], symbol); + ++self->block_size_; + if (self->block_size_ == self->target_block_size_) { + FN(BlockSplitterFinishBlock)(self, /* is_final = */ BROTLI_FALSE); + } +} + +#undef HistogramType diff --git a/modules/brotli/enc/params.h b/modules/brotli/enc/params.h new file mode 100644 index 000000000..6ecf1d3f9 --- /dev/null +++ b/modules/brotli/enc/params.h @@ -0,0 +1,44 @@ +/* Copyright 2017 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Parameters for the Brotli encoder with chosen quality levels. */ + +#ifndef BROTLI_ENC_PARAMS_H_ +#define BROTLI_ENC_PARAMS_H_ + +#include <brotli/encode.h> +#include "./encoder_dict.h" + +typedef struct BrotliHasherParams { + int type; + int bucket_bits; + int block_bits; + int hash_len; + int num_last_distances_to_check; +} BrotliHasherParams; + +typedef struct BrotliDistanceParams { + uint32_t distance_postfix_bits; + uint32_t num_direct_distance_codes; + uint32_t alphabet_size; + size_t max_distance; +} BrotliDistanceParams; + +/* Encoding parameters */ +typedef struct BrotliEncoderParams { + BrotliEncoderMode mode; + int quality; + int lgwin; + int lgblock; + size_t size_hint; + BROTLI_BOOL disable_literal_context_modeling; + BROTLI_BOOL large_window; + BrotliHasherParams hasher; + BrotliDistanceParams dist; + BrotliEncoderDictionary dictionary; +} BrotliEncoderParams; + +#endif /* BROTLI_ENC_PARAMS_H_ */ diff --git a/modules/brotli/enc/prefix.h b/modules/brotli/enc/prefix.h new file mode 100644 index 000000000..fd359a478 --- /dev/null +++ b/modules/brotli/enc/prefix.h @@ -0,0 +1,53 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Functions for encoding of integers into prefix codes the amount of extra + bits, and the actual values of the extra bits. */ + +#ifndef BROTLI_ENC_PREFIX_H_ +#define BROTLI_ENC_PREFIX_H_ + +#include "../common/constants.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./fast_log.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* Here distance_code is an intermediate code, i.e. one of the special codes or + the actual distance increased by BROTLI_NUM_DISTANCE_SHORT_CODES - 1. */ +static BROTLI_INLINE void PrefixEncodeCopyDistance(size_t distance_code, + size_t num_direct_codes, + size_t postfix_bits, + uint16_t* code, + uint32_t* extra_bits) { + if (distance_code < BROTLI_NUM_DISTANCE_SHORT_CODES + num_direct_codes) { + *code = (uint16_t)distance_code; + *extra_bits = 0; + return; + } else { + size_t dist = ((size_t)1 << (postfix_bits + 2u)) + + (distance_code - BROTLI_NUM_DISTANCE_SHORT_CODES - num_direct_codes); + size_t bucket = Log2FloorNonZero(dist) - 1; + size_t postfix_mask = (1u << postfix_bits) - 1; + size_t postfix = dist & postfix_mask; + size_t prefix = (dist >> bucket) & 1; + size_t offset = (2 + prefix) << bucket; + size_t nbits = bucket - postfix_bits; + *code = (uint16_t)((nbits << 10) | + (BROTLI_NUM_DISTANCE_SHORT_CODES + num_direct_codes + + ((2 * (nbits - 1) + prefix) << postfix_bits) + postfix)); + *extra_bits = (uint32_t)((dist - offset) >> postfix_bits); + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_PREFIX_H_ */ diff --git a/modules/brotli/enc/quality.h b/modules/brotli/enc/quality.h new file mode 100644 index 000000000..5f4d03450 --- /dev/null +++ b/modules/brotli/enc/quality.h @@ -0,0 +1,165 @@ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Constants and formulas that affect speed-ratio trade-offs and thus define + quality levels. */ + +#ifndef BROTLI_ENC_QUALITY_H_ +#define BROTLI_ENC_QUALITY_H_ + +#include "../common/platform.h" +#include <brotli/encode.h> +#include "./params.h" + +#define FAST_ONE_PASS_COMPRESSION_QUALITY 0 +#define FAST_TWO_PASS_COMPRESSION_QUALITY 1 +#define ZOPFLIFICATION_QUALITY 10 +#define HQ_ZOPFLIFICATION_QUALITY 11 + +#define MAX_QUALITY_FOR_STATIC_ENTROPY_CODES 2 +#define MIN_QUALITY_FOR_BLOCK_SPLIT 4 +#define MIN_QUALITY_FOR_NONZERO_DISTANCE_PARAMS 4 +#define MIN_QUALITY_FOR_OPTIMIZE_HISTOGRAMS 4 +#define MIN_QUALITY_FOR_EXTENSIVE_REFERENCE_SEARCH 5 +#define MIN_QUALITY_FOR_CONTEXT_MODELING 5 +#define MIN_QUALITY_FOR_HQ_CONTEXT_MODELING 7 +#define MIN_QUALITY_FOR_HQ_BLOCK_SPLITTING 10 + +/* For quality below MIN_QUALITY_FOR_BLOCK_SPLIT there is no block splitting, + so we buffer at most this much literals and commands. */ +#define MAX_NUM_DELAYED_SYMBOLS 0x2FFF + +/* Returns hash-table size for quality levels 0 and 1. */ +static BROTLI_INLINE size_t MaxHashTableSize(int quality) { + return quality == FAST_ONE_PASS_COMPRESSION_QUALITY ? 1 << 15 : 1 << 17; +} + +/* The maximum length for which the zopflification uses distinct distances. */ +#define MAX_ZOPFLI_LEN_QUALITY_10 150 +#define MAX_ZOPFLI_LEN_QUALITY_11 325 + +/* Do not thoroughly search when a long copy is found. */ +#define BROTLI_LONG_COPY_QUICK_STEP 16384 + +static BROTLI_INLINE size_t MaxZopfliLen(const BrotliEncoderParams* params) { + return params->quality <= 10 ? + MAX_ZOPFLI_LEN_QUALITY_10 : + MAX_ZOPFLI_LEN_QUALITY_11; +} + +/* Number of best candidates to evaluate to expand Zopfli chain. */ +static BROTLI_INLINE size_t MaxZopfliCandidates( + const BrotliEncoderParams* params) { + return params->quality <= 10 ? 1 : 5; +} + +static BROTLI_INLINE void SanitizeParams(BrotliEncoderParams* params) { + params->quality = BROTLI_MIN(int, BROTLI_MAX_QUALITY, + BROTLI_MAX(int, BROTLI_MIN_QUALITY, params->quality)); + if (params->quality <= MAX_QUALITY_FOR_STATIC_ENTROPY_CODES) { + params->large_window = BROTLI_FALSE; + } + if (params->lgwin < BROTLI_MIN_WINDOW_BITS) { + params->lgwin = BROTLI_MIN_WINDOW_BITS; + } else { + int max_lgwin = params->large_window ? BROTLI_LARGE_MAX_WINDOW_BITS : + BROTLI_MAX_WINDOW_BITS; + if (params->lgwin > max_lgwin) params->lgwin = max_lgwin; + } +} + +/* Returns optimized lg_block value. */ +static BROTLI_INLINE int ComputeLgBlock(const BrotliEncoderParams* params) { + int lgblock = params->lgblock; + if (params->quality == FAST_ONE_PASS_COMPRESSION_QUALITY || + params->quality == FAST_TWO_PASS_COMPRESSION_QUALITY) { + lgblock = params->lgwin; + } else if (params->quality < MIN_QUALITY_FOR_BLOCK_SPLIT) { + lgblock = 14; + } else if (lgblock == 0) { + lgblock = 16; + if (params->quality >= 9 && params->lgwin > lgblock) { + lgblock = BROTLI_MIN(int, 18, params->lgwin); + } + } else { + lgblock = BROTLI_MIN(int, BROTLI_MAX_INPUT_BLOCK_BITS, + BROTLI_MAX(int, BROTLI_MIN_INPUT_BLOCK_BITS, lgblock)); + } + return lgblock; +} + +/* Returns log2 of the size of main ring buffer area. + Allocate at least lgwin + 1 bits for the ring buffer so that the newly + added block fits there completely and we still get lgwin bits and at least + read_block_size_bits + 1 bits because the copy tail length needs to be + smaller than ring-buffer size. */ +static BROTLI_INLINE int ComputeRbBits(const BrotliEncoderParams* params) { + return 1 + BROTLI_MAX(int, params->lgwin, params->lgblock); +} + +static BROTLI_INLINE size_t MaxMetablockSize( + const BrotliEncoderParams* params) { + int bits = + BROTLI_MIN(int, ComputeRbBits(params), BROTLI_MAX_INPUT_BLOCK_BITS); + return (size_t)1 << bits; +} + +/* When searching for backward references and have not seen matches for a long + time, we can skip some match lookups. Unsuccessful match lookups are very + expensive and this kind of a heuristic speeds up compression quite a lot. + At first 8 byte strides are taken and every second byte is put to hasher. + After 4x more literals stride by 16 bytes, every put 4-th byte to hasher. + Applied only to qualities 2 to 9. */ +static BROTLI_INLINE size_t LiteralSpreeLengthForSparseSearch( + const BrotliEncoderParams* params) { + return params->quality < 9 ? 64 : 512; +} + +static BROTLI_INLINE void ChooseHasher(const BrotliEncoderParams* params, + BrotliHasherParams* hparams) { + if (params->quality > 9) { + hparams->type = 10; + } else if (params->quality == 4 && params->size_hint >= (1 << 20)) { + hparams->type = 54; + } else if (params->quality < 5) { + hparams->type = params->quality; + } else if (params->lgwin <= 16) { + hparams->type = params->quality < 7 ? 40 : params->quality < 9 ? 41 : 42; + } else if (params->size_hint >= (1 << 20) && params->lgwin >= 19) { + hparams->type = 6; + hparams->block_bits = params->quality - 1; + hparams->bucket_bits = 15; + hparams->hash_len = 5; + hparams->num_last_distances_to_check = + params->quality < 7 ? 4 : params->quality < 9 ? 10 : 16; + } else { + hparams->type = 5; + hparams->block_bits = params->quality - 1; + hparams->bucket_bits = params->quality < 7 ? 14 : 15; + hparams->num_last_distances_to_check = + params->quality < 7 ? 4 : params->quality < 9 ? 10 : 16; + } + + if (params->lgwin > 24) { + /* Different hashers for large window brotli: not for qualities <= 2, + these are too fast for large window. Not for qualities >= 10: their + hasher already works well with large window. So the changes are: + H3 --> H35: for quality 3. + H54 --> H55: for quality 4 with size hint > 1MB + H6 --> H65: for qualities 5, 6, 7, 8, 9. */ + if (hparams->type == 3) { + hparams->type = 35; + } + if (hparams->type == 54) { + hparams->type = 55; + } + if (hparams->type == 6) { + hparams->type = 65; + } + } +} + +#endif /* BROTLI_ENC_QUALITY_H_ */ diff --git a/modules/brotli/enc/ringbuffer.h b/modules/brotli/enc/ringbuffer.h new file mode 100644 index 000000000..86079a89d --- /dev/null +++ b/modules/brotli/enc/ringbuffer.h @@ -0,0 +1,164 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Sliding window over the input data. */ + +#ifndef BROTLI_ENC_RINGBUFFER_H_ +#define BROTLI_ENC_RINGBUFFER_H_ + +#include <string.h> /* memcpy */ + +#include "../common/platform.h" +#include <brotli/types.h> +#include "./memory.h" +#include "./quality.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* A RingBuffer(window_bits, tail_bits) contains `1 << window_bits' bytes of + data in a circular manner: writing a byte writes it to: + `position() % (1 << window_bits)'. + For convenience, the RingBuffer array contains another copy of the + first `1 << tail_bits' bytes: + buffer_[i] == buffer_[i + (1 << window_bits)], if i < (1 << tail_bits), + and another copy of the last two bytes: + buffer_[-1] == buffer_[(1 << window_bits) - 1] and + buffer_[-2] == buffer_[(1 << window_bits) - 2]. */ +typedef struct RingBuffer { + /* Size of the ring-buffer is (1 << window_bits) + tail_size_. */ + const uint32_t size_; + const uint32_t mask_; + const uint32_t tail_size_; + const uint32_t total_size_; + + uint32_t cur_size_; + /* Position to write in the ring buffer. */ + uint32_t pos_; + /* The actual ring buffer containing the copy of the last two bytes, the data, + and the copy of the beginning as a tail. */ + uint8_t* data_; + /* The start of the ring-buffer. */ + uint8_t* buffer_; +} RingBuffer; + +static BROTLI_INLINE void RingBufferInit(RingBuffer* rb) { + rb->cur_size_ = 0; + rb->pos_ = 0; + rb->data_ = 0; + rb->buffer_ = 0; +} + +static BROTLI_INLINE void RingBufferSetup( + const BrotliEncoderParams* params, RingBuffer* rb) { + int window_bits = ComputeRbBits(params); + int tail_bits = params->lgblock; + *(uint32_t*)&rb->size_ = 1u << window_bits; + *(uint32_t*)&rb->mask_ = (1u << window_bits) - 1; + *(uint32_t*)&rb->tail_size_ = 1u << tail_bits; + *(uint32_t*)&rb->total_size_ = rb->size_ + rb->tail_size_; +} + +static BROTLI_INLINE void RingBufferFree(MemoryManager* m, RingBuffer* rb) { + BROTLI_FREE(m, rb->data_); +} + +/* Allocates or re-allocates data_ to the given length + plus some slack + region before and after. Fills the slack regions with zeros. */ +static BROTLI_INLINE void RingBufferInitBuffer( + MemoryManager* m, const uint32_t buflen, RingBuffer* rb) { + static const size_t kSlackForEightByteHashingEverywhere = 7; + uint8_t* new_data = BROTLI_ALLOC( + m, uint8_t, 2 + buflen + kSlackForEightByteHashingEverywhere); + size_t i; + if (BROTLI_IS_OOM(m)) return; + if (rb->data_) { + memcpy(new_data, rb->data_, + 2 + rb->cur_size_ + kSlackForEightByteHashingEverywhere); + BROTLI_FREE(m, rb->data_); + } + rb->data_ = new_data; + rb->cur_size_ = buflen; + rb->buffer_ = rb->data_ + 2; + rb->buffer_[-2] = rb->buffer_[-1] = 0; + for (i = 0; i < kSlackForEightByteHashingEverywhere; ++i) { + rb->buffer_[rb->cur_size_ + i] = 0; + } +} + +static BROTLI_INLINE void RingBufferWriteTail( + const uint8_t* bytes, size_t n, RingBuffer* rb) { + const size_t masked_pos = rb->pos_ & rb->mask_; + if (BROTLI_PREDICT_FALSE(masked_pos < rb->tail_size_)) { + /* Just fill the tail buffer with the beginning data. */ + const size_t p = rb->size_ + masked_pos; + memcpy(&rb->buffer_[p], bytes, + BROTLI_MIN(size_t, n, rb->tail_size_ - masked_pos)); + } +} + +/* Push bytes into the ring buffer. */ +static BROTLI_INLINE void RingBufferWrite( + MemoryManager* m, const uint8_t* bytes, size_t n, RingBuffer* rb) { + if (rb->pos_ == 0 && n < rb->tail_size_) { + /* Special case for the first write: to process the first block, we don't + need to allocate the whole ring-buffer and we don't need the tail + either. However, we do this memory usage optimization only if the + first write is less than the tail size, which is also the input block + size, otherwise it is likely that other blocks will follow and we + will need to reallocate to the full size anyway. */ + rb->pos_ = (uint32_t)n; + RingBufferInitBuffer(m, rb->pos_, rb); + if (BROTLI_IS_OOM(m)) return; + memcpy(rb->buffer_, bytes, n); + return; + } + if (rb->cur_size_ < rb->total_size_) { + /* Lazily allocate the full buffer. */ + RingBufferInitBuffer(m, rb->total_size_, rb); + if (BROTLI_IS_OOM(m)) return; + /* Initialize the last two bytes to zero, so that we don't have to worry + later when we copy the last two bytes to the first two positions. */ + rb->buffer_[rb->size_ - 2] = 0; + rb->buffer_[rb->size_ - 1] = 0; + } + { + const size_t masked_pos = rb->pos_ & rb->mask_; + /* The length of the writes is limited so that we do not need to worry + about a write */ + RingBufferWriteTail(bytes, n, rb); + if (BROTLI_PREDICT_TRUE(masked_pos + n <= rb->size_)) { + /* A single write fits. */ + memcpy(&rb->buffer_[masked_pos], bytes, n); + } else { + /* Split into two writes. + Copy into the end of the buffer, including the tail buffer. */ + memcpy(&rb->buffer_[masked_pos], bytes, + BROTLI_MIN(size_t, n, rb->total_size_ - masked_pos)); + /* Copy into the beginning of the buffer */ + memcpy(&rb->buffer_[0], bytes + (rb->size_ - masked_pos), + n - (rb->size_ - masked_pos)); + } + } + { + BROTLI_BOOL not_first_lap = (rb->pos_ & (1u << 31)) != 0; + uint32_t rb_pos_mask = (1u << 31) - 1; + rb->buffer_[-2] = rb->buffer_[rb->size_ - 2]; + rb->buffer_[-1] = rb->buffer_[rb->size_ - 1]; + rb->pos_ = (rb->pos_ & rb_pos_mask) + (uint32_t)(n & rb_pos_mask); + if (not_first_lap) { + /* Wrap, but preserve not-a-first-lap feature. */ + rb->pos_ |= 1u << 31; + } + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_RINGBUFFER_H_ */ diff --git a/modules/brotli/enc/static_dict.c b/modules/brotli/enc/static_dict.c new file mode 100644 index 000000000..7299ab720 --- /dev/null +++ b/modules/brotli/enc/static_dict.c @@ -0,0 +1,486 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#include "./static_dict.h" + +#include "../common/dictionary.h" +#include "../common/platform.h" +#include "../common/transform.h" +#include "./encoder_dict.h" +#include "./find_match_length.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static BROTLI_INLINE uint32_t Hash(const uint8_t* data) { + uint32_t h = BROTLI_UNALIGNED_LOAD32LE(data) * kDictHashMul32; + /* The higher bits contain more mixture from the multiplication, + so we take our results from there. */ + return h >> (32 - kDictNumBits); +} + +static BROTLI_INLINE void AddMatch(size_t distance, size_t len, size_t len_code, + uint32_t* matches) { + uint32_t match = (uint32_t)((distance << 5) + len_code); + matches[len] = BROTLI_MIN(uint32_t, matches[len], match); +} + +static BROTLI_INLINE size_t DictMatchLength(const BrotliDictionary* dictionary, + const uint8_t* data, + size_t id, + size_t len, + size_t maxlen) { + const size_t offset = dictionary->offsets_by_length[len] + len * id; + return FindMatchLengthWithLimit(&dictionary->data[offset], data, + BROTLI_MIN(size_t, len, maxlen)); +} + +static BROTLI_INLINE BROTLI_BOOL IsMatch(const BrotliDictionary* dictionary, + DictWord w, const uint8_t* data, size_t max_length) { + if (w.len > max_length) { + return BROTLI_FALSE; + } else { + const size_t offset = dictionary->offsets_by_length[w.len] + + (size_t)w.len * (size_t)w.idx; + const uint8_t* dict = &dictionary->data[offset]; + if (w.transform == 0) { + /* Match against base dictionary word. */ + return + TO_BROTLI_BOOL(FindMatchLengthWithLimit(dict, data, w.len) == w.len); + } else if (w.transform == 10) { + /* Match against uppercase first transform. + Note that there are only ASCII uppercase words in the lookup table. */ + return TO_BROTLI_BOOL(dict[0] >= 'a' && dict[0] <= 'z' && + (dict[0] ^ 32) == data[0] && + FindMatchLengthWithLimit(&dict[1], &data[1], w.len - 1u) == + w.len - 1u); + } else { + /* Match against uppercase all transform. + Note that there are only ASCII uppercase words in the lookup table. */ + size_t i; + for (i = 0; i < w.len; ++i) { + if (dict[i] >= 'a' && dict[i] <= 'z') { + if ((dict[i] ^ 32) != data[i]) return BROTLI_FALSE; + } else { + if (dict[i] != data[i]) return BROTLI_FALSE; + } + } + return BROTLI_TRUE; + } + } +} + +BROTLI_BOOL BrotliFindAllStaticDictionaryMatches( + const BrotliEncoderDictionary* dictionary, const uint8_t* data, + size_t min_length, size_t max_length, uint32_t* matches) { + BROTLI_BOOL has_found_match = BROTLI_FALSE; + { + size_t offset = dictionary->buckets[Hash(data)]; + BROTLI_BOOL end = !offset; + while (!end) { + DictWord w = dictionary->dict_words[offset++]; + const size_t l = w.len & 0x1F; + const size_t n = (size_t)1 << dictionary->words->size_bits_by_length[l]; + const size_t id = w.idx; + end = !!(w.len & 0x80); + w.len = (uint8_t)l; + if (w.transform == 0) { + const size_t matchlen = + DictMatchLength(dictionary->words, data, id, l, max_length); + const uint8_t* s; + size_t minlen; + size_t maxlen; + size_t len; + /* Transform "" + BROTLI_TRANSFORM_IDENTITY + "" */ + if (matchlen == l) { + AddMatch(id, l, l, matches); + has_found_match = BROTLI_TRUE; + } + /* Transforms "" + BROTLI_TRANSFORM_OMIT_LAST_1 + "" and + "" + BROTLI_TRANSFORM_OMIT_LAST_1 + "ing " */ + if (matchlen >= l - 1) { + AddMatch(id + 12 * n, l - 1, l, matches); + if (l + 2 < max_length && + data[l - 1] == 'i' && data[l] == 'n' && data[l + 1] == 'g' && + data[l + 2] == ' ') { + AddMatch(id + 49 * n, l + 3, l, matches); + } + has_found_match = BROTLI_TRUE; + } + /* Transform "" + BROTLI_TRANSFORM_OMIT_LAST_# + "" (# = 2 .. 9) */ + minlen = min_length; + if (l > 9) minlen = BROTLI_MAX(size_t, minlen, l - 9); + maxlen = BROTLI_MIN(size_t, matchlen, l - 2); + for (len = minlen; len <= maxlen; ++len) { + size_t cut = l - len; + size_t transform_id = (cut << 2) + + (size_t)((dictionary->cutoffTransforms >> (cut * 6)) & 0x3F); + AddMatch(id + transform_id * n, len, l, matches); + has_found_match = BROTLI_TRUE; + } + if (matchlen < l || l + 6 >= max_length) { + continue; + } + s = &data[l]; + /* Transforms "" + BROTLI_TRANSFORM_IDENTITY + <suffix> */ + if (s[0] == ' ') { + AddMatch(id + n, l + 1, l, matches); + if (s[1] == 'a') { + if (s[2] == ' ') { + AddMatch(id + 28 * n, l + 3, l, matches); + } else if (s[2] == 's') { + if (s[3] == ' ') AddMatch(id + 46 * n, l + 4, l, matches); + } else if (s[2] == 't') { + if (s[3] == ' ') AddMatch(id + 60 * n, l + 4, l, matches); + } else if (s[2] == 'n') { + if (s[3] == 'd' && s[4] == ' ') { + AddMatch(id + 10 * n, l + 5, l, matches); + } + } + } else if (s[1] == 'b') { + if (s[2] == 'y' && s[3] == ' ') { + AddMatch(id + 38 * n, l + 4, l, matches); + } + } else if (s[1] == 'i') { + if (s[2] == 'n') { + if (s[3] == ' ') AddMatch(id + 16 * n, l + 4, l, matches); + } else if (s[2] == 's') { + if (s[3] == ' ') AddMatch(id + 47 * n, l + 4, l, matches); + } + } else if (s[1] == 'f') { + if (s[2] == 'o') { + if (s[3] == 'r' && s[4] == ' ') { + AddMatch(id + 25 * n, l + 5, l, matches); + } + } else if (s[2] == 'r') { + if (s[3] == 'o' && s[4] == 'm' && s[5] == ' ') { + AddMatch(id + 37 * n, l + 6, l, matches); + } + } + } else if (s[1] == 'o') { + if (s[2] == 'f') { + if (s[3] == ' ') AddMatch(id + 8 * n, l + 4, l, matches); + } else if (s[2] == 'n') { + if (s[3] == ' ') AddMatch(id + 45 * n, l + 4, l, matches); + } + } else if (s[1] == 'n') { + if (s[2] == 'o' && s[3] == 't' && s[4] == ' ') { + AddMatch(id + 80 * n, l + 5, l, matches); + } + } else if (s[1] == 't') { + if (s[2] == 'h') { + if (s[3] == 'e') { + if (s[4] == ' ') AddMatch(id + 5 * n, l + 5, l, matches); + } else if (s[3] == 'a') { + if (s[4] == 't' && s[5] == ' ') { + AddMatch(id + 29 * n, l + 6, l, matches); + } + } + } else if (s[2] == 'o') { + if (s[3] == ' ') AddMatch(id + 17 * n, l + 4, l, matches); + } + } else if (s[1] == 'w') { + if (s[2] == 'i' && s[3] == 't' && s[4] == 'h' && s[5] == ' ') { + AddMatch(id + 35 * n, l + 6, l, matches); + } + } + } else if (s[0] == '"') { + AddMatch(id + 19 * n, l + 1, l, matches); + if (s[1] == '>') { + AddMatch(id + 21 * n, l + 2, l, matches); + } + } else if (s[0] == '.') { + AddMatch(id + 20 * n, l + 1, l, matches); + if (s[1] == ' ') { + AddMatch(id + 31 * n, l + 2, l, matches); + if (s[2] == 'T' && s[3] == 'h') { + if (s[4] == 'e') { + if (s[5] == ' ') AddMatch(id + 43 * n, l + 6, l, matches); + } else if (s[4] == 'i') { + if (s[5] == 's' && s[6] == ' ') { + AddMatch(id + 75 * n, l + 7, l, matches); + } + } + } + } + } else if (s[0] == ',') { + AddMatch(id + 76 * n, l + 1, l, matches); + if (s[1] == ' ') { + AddMatch(id + 14 * n, l + 2, l, matches); + } + } else if (s[0] == '\n') { + AddMatch(id + 22 * n, l + 1, l, matches); + if (s[1] == '\t') { + AddMatch(id + 50 * n, l + 2, l, matches); + } + } else if (s[0] == ']') { + AddMatch(id + 24 * n, l + 1, l, matches); + } else if (s[0] == '\'') { + AddMatch(id + 36 * n, l + 1, l, matches); + } else if (s[0] == ':') { + AddMatch(id + 51 * n, l + 1, l, matches); + } else if (s[0] == '(') { + AddMatch(id + 57 * n, l + 1, l, matches); + } else if (s[0] == '=') { + if (s[1] == '"') { + AddMatch(id + 70 * n, l + 2, l, matches); + } else if (s[1] == '\'') { + AddMatch(id + 86 * n, l + 2, l, matches); + } + } else if (s[0] == 'a') { + if (s[1] == 'l' && s[2] == ' ') { + AddMatch(id + 84 * n, l + 3, l, matches); + } + } else if (s[0] == 'e') { + if (s[1] == 'd') { + if (s[2] == ' ') AddMatch(id + 53 * n, l + 3, l, matches); + } else if (s[1] == 'r') { + if (s[2] == ' ') AddMatch(id + 82 * n, l + 3, l, matches); + } else if (s[1] == 's') { + if (s[2] == 't' && s[3] == ' ') { + AddMatch(id + 95 * n, l + 4, l, matches); + } + } + } else if (s[0] == 'f') { + if (s[1] == 'u' && s[2] == 'l' && s[3] == ' ') { + AddMatch(id + 90 * n, l + 4, l, matches); + } + } else if (s[0] == 'i') { + if (s[1] == 'v') { + if (s[2] == 'e' && s[3] == ' ') { + AddMatch(id + 92 * n, l + 4, l, matches); + } + } else if (s[1] == 'z') { + if (s[2] == 'e' && s[3] == ' ') { + AddMatch(id + 100 * n, l + 4, l, matches); + } + } + } else if (s[0] == 'l') { + if (s[1] == 'e') { + if (s[2] == 's' && s[3] == 's' && s[4] == ' ') { + AddMatch(id + 93 * n, l + 5, l, matches); + } + } else if (s[1] == 'y') { + if (s[2] == ' ') AddMatch(id + 61 * n, l + 3, l, matches); + } + } else if (s[0] == 'o') { + if (s[1] == 'u' && s[2] == 's' && s[3] == ' ') { + AddMatch(id + 106 * n, l + 4, l, matches); + } + } + } else { + /* Set is_all_caps=0 for BROTLI_TRANSFORM_UPPERCASE_FIRST and + is_all_caps=1 otherwise (BROTLI_TRANSFORM_UPPERCASE_ALL) + transform. */ + const BROTLI_BOOL is_all_caps = + TO_BROTLI_BOOL(w.transform != BROTLI_TRANSFORM_UPPERCASE_FIRST); + const uint8_t* s; + if (!IsMatch(dictionary->words, w, data, max_length)) { + continue; + } + /* Transform "" + kUppercase{First,All} + "" */ + AddMatch(id + (is_all_caps ? 44 : 9) * n, l, l, matches); + has_found_match = BROTLI_TRUE; + if (l + 1 >= max_length) { + continue; + } + /* Transforms "" + kUppercase{First,All} + <suffix> */ + s = &data[l]; + if (s[0] == ' ') { + AddMatch(id + (is_all_caps ? 68 : 4) * n, l + 1, l, matches); + } else if (s[0] == '"') { + AddMatch(id + (is_all_caps ? 87 : 66) * n, l + 1, l, matches); + if (s[1] == '>') { + AddMatch(id + (is_all_caps ? 97 : 69) * n, l + 2, l, matches); + } + } else if (s[0] == '.') { + AddMatch(id + (is_all_caps ? 101 : 79) * n, l + 1, l, matches); + if (s[1] == ' ') { + AddMatch(id + (is_all_caps ? 114 : 88) * n, l + 2, l, matches); + } + } else if (s[0] == ',') { + AddMatch(id + (is_all_caps ? 112 : 99) * n, l + 1, l, matches); + if (s[1] == ' ') { + AddMatch(id + (is_all_caps ? 107 : 58) * n, l + 2, l, matches); + } + } else if (s[0] == '\'') { + AddMatch(id + (is_all_caps ? 94 : 74) * n, l + 1, l, matches); + } else if (s[0] == '(') { + AddMatch(id + (is_all_caps ? 113 : 78) * n, l + 1, l, matches); + } else if (s[0] == '=') { + if (s[1] == '"') { + AddMatch(id + (is_all_caps ? 105 : 104) * n, l + 2, l, matches); + } else if (s[1] == '\'') { + AddMatch(id + (is_all_caps ? 116 : 108) * n, l + 2, l, matches); + } + } + } + } + } + /* Transforms with prefixes " " and "." */ + if (max_length >= 5 && (data[0] == ' ' || data[0] == '.')) { + BROTLI_BOOL is_space = TO_BROTLI_BOOL(data[0] == ' '); + size_t offset = dictionary->buckets[Hash(&data[1])]; + BROTLI_BOOL end = !offset; + while (!end) { + DictWord w = dictionary->dict_words[offset++]; + const size_t l = w.len & 0x1F; + const size_t n = (size_t)1 << dictionary->words->size_bits_by_length[l]; + const size_t id = w.idx; + end = !!(w.len & 0x80); + w.len = (uint8_t)l; + if (w.transform == 0) { + const uint8_t* s; + if (!IsMatch(dictionary->words, w, &data[1], max_length - 1)) { + continue; + } + /* Transforms " " + BROTLI_TRANSFORM_IDENTITY + "" and + "." + BROTLI_TRANSFORM_IDENTITY + "" */ + AddMatch(id + (is_space ? 6 : 32) * n, l + 1, l, matches); + has_found_match = BROTLI_TRUE; + if (l + 2 >= max_length) { + continue; + } + /* Transforms " " + BROTLI_TRANSFORM_IDENTITY + <suffix> and + "." + BROTLI_TRANSFORM_IDENTITY + <suffix> + */ + s = &data[l + 1]; + if (s[0] == ' ') { + AddMatch(id + (is_space ? 2 : 77) * n, l + 2, l, matches); + } else if (s[0] == '(') { + AddMatch(id + (is_space ? 89 : 67) * n, l + 2, l, matches); + } else if (is_space) { + if (s[0] == ',') { + AddMatch(id + 103 * n, l + 2, l, matches); + if (s[1] == ' ') { + AddMatch(id + 33 * n, l + 3, l, matches); + } + } else if (s[0] == '.') { + AddMatch(id + 71 * n, l + 2, l, matches); + if (s[1] == ' ') { + AddMatch(id + 52 * n, l + 3, l, matches); + } + } else if (s[0] == '=') { + if (s[1] == '"') { + AddMatch(id + 81 * n, l + 3, l, matches); + } else if (s[1] == '\'') { + AddMatch(id + 98 * n, l + 3, l, matches); + } + } + } + } else if (is_space) { + /* Set is_all_caps=0 for BROTLI_TRANSFORM_UPPERCASE_FIRST and + is_all_caps=1 otherwise (BROTLI_TRANSFORM_UPPERCASE_ALL) + transform. */ + const BROTLI_BOOL is_all_caps = + TO_BROTLI_BOOL(w.transform != BROTLI_TRANSFORM_UPPERCASE_FIRST); + const uint8_t* s; + if (!IsMatch(dictionary->words, w, &data[1], max_length - 1)) { + continue; + } + /* Transforms " " + kUppercase{First,All} + "" */ + AddMatch(id + (is_all_caps ? 85 : 30) * n, l + 1, l, matches); + has_found_match = BROTLI_TRUE; + if (l + 2 >= max_length) { + continue; + } + /* Transforms " " + kUppercase{First,All} + <suffix> */ + s = &data[l + 1]; + if (s[0] == ' ') { + AddMatch(id + (is_all_caps ? 83 : 15) * n, l + 2, l, matches); + } else if (s[0] == ',') { + if (!is_all_caps) { + AddMatch(id + 109 * n, l + 2, l, matches); + } + if (s[1] == ' ') { + AddMatch(id + (is_all_caps ? 111 : 65) * n, l + 3, l, matches); + } + } else if (s[0] == '.') { + AddMatch(id + (is_all_caps ? 115 : 96) * n, l + 2, l, matches); + if (s[1] == ' ') { + AddMatch(id + (is_all_caps ? 117 : 91) * n, l + 3, l, matches); + } + } else if (s[0] == '=') { + if (s[1] == '"') { + AddMatch(id + (is_all_caps ? 110 : 118) * n, l + 3, l, matches); + } else if (s[1] == '\'') { + AddMatch(id + (is_all_caps ? 119 : 120) * n, l + 3, l, matches); + } + } + } + } + } + if (max_length >= 6) { + /* Transforms with prefixes "e ", "s ", ", " and "\xC2\xA0" */ + if ((data[1] == ' ' && + (data[0] == 'e' || data[0] == 's' || data[0] == ',')) || + (data[0] == 0xC2 && data[1] == 0xA0)) { + size_t offset = dictionary->buckets[Hash(&data[2])]; + BROTLI_BOOL end = !offset; + while (!end) { + DictWord w = dictionary->dict_words[offset++]; + const size_t l = w.len & 0x1F; + const size_t n = (size_t)1 << dictionary->words->size_bits_by_length[l]; + const size_t id = w.idx; + end = !!(w.len & 0x80); + w.len = (uint8_t)l; + if (w.transform == 0 && + IsMatch(dictionary->words, w, &data[2], max_length - 2)) { + if (data[0] == 0xC2) { + AddMatch(id + 102 * n, l + 2, l, matches); + has_found_match = BROTLI_TRUE; + } else if (l + 2 < max_length && data[l + 2] == ' ') { + size_t t = data[0] == 'e' ? 18 : (data[0] == 's' ? 7 : 13); + AddMatch(id + t * n, l + 3, l, matches); + has_found_match = BROTLI_TRUE; + } + } + } + } + } + if (max_length >= 9) { + /* Transforms with prefixes " the " and ".com/" */ + if ((data[0] == ' ' && data[1] == 't' && data[2] == 'h' && + data[3] == 'e' && data[4] == ' ') || + (data[0] == '.' && data[1] == 'c' && data[2] == 'o' && + data[3] == 'm' && data[4] == '/')) { + size_t offset = dictionary->buckets[Hash(&data[5])]; + BROTLI_BOOL end = !offset; + while (!end) { + DictWord w = dictionary->dict_words[offset++]; + const size_t l = w.len & 0x1F; + const size_t n = (size_t)1 << dictionary->words->size_bits_by_length[l]; + const size_t id = w.idx; + end = !!(w.len & 0x80); + w.len = (uint8_t)l; + if (w.transform == 0 && + IsMatch(dictionary->words, w, &data[5], max_length - 5)) { + AddMatch(id + (data[0] == ' ' ? 41 : 72) * n, l + 5, l, matches); + has_found_match = BROTLI_TRUE; + if (l + 5 < max_length) { + const uint8_t* s = &data[l + 5]; + if (data[0] == ' ') { + if (l + 8 < max_length && + s[0] == ' ' && s[1] == 'o' && s[2] == 'f' && s[3] == ' ') { + AddMatch(id + 62 * n, l + 9, l, matches); + if (l + 12 < max_length && + s[4] == 't' && s[5] == 'h' && s[6] == 'e' && s[7] == ' ') { + AddMatch(id + 73 * n, l + 13, l, matches); + } + } + } + } + } + } + } + } + return has_found_match; +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/static_dict.h b/modules/brotli/enc/static_dict.h new file mode 100644 index 000000000..6b5d4eb0c --- /dev/null +++ b/modules/brotli/enc/static_dict.h @@ -0,0 +1,40 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Class to model the static dictionary. */ + +#ifndef BROTLI_ENC_STATIC_DICT_H_ +#define BROTLI_ENC_STATIC_DICT_H_ + +#include "../common/dictionary.h" +#include "../common/platform.h" +#include <brotli/types.h> +#include "./encoder_dict.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define BROTLI_MAX_STATIC_DICTIONARY_MATCH_LEN 37 +static const uint32_t kInvalidMatch = 0xFFFFFFF; + +/* Matches data against static dictionary words, and for each length l, + for which a match is found, updates matches[l] to be the minimum possible + (distance << 5) + len_code. + Returns 1 if matches have been found, otherwise 0. + Prerequisites: + matches array is at least BROTLI_MAX_STATIC_DICTIONARY_MATCH_LEN + 1 long + all elements are initialized to kInvalidMatch */ +BROTLI_INTERNAL BROTLI_BOOL BrotliFindAllStaticDictionaryMatches( + const BrotliEncoderDictionary* dictionary, + const uint8_t* data, size_t min_length, size_t max_length, + uint32_t* matches); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_STATIC_DICT_H_ */ diff --git a/modules/brotli/enc/static_dict_lut.h b/modules/brotli/enc/static_dict_lut.h new file mode 100644 index 000000000..e299cda6d --- /dev/null +++ b/modules/brotli/enc/static_dict_lut.h @@ -0,0 +1,5864 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Lookup table for static dictionary and transforms. */ + +#ifndef BROTLI_ENC_STATIC_DICT_LUT_H_ +#define BROTLI_ENC_STATIC_DICT_LUT_H_ + +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +typedef struct DictWord { + /* Highest bit is used to indicate end of bucket. */ + uint8_t len; + uint8_t transform; + uint16_t idx; +} DictWord; + +static const int kDictNumBits = 15; +static const uint32_t kDictHashMul32 = 0x1E35A7BD; + +static const uint16_t kStaticDictionaryBuckets[32768] = { +1,0,0,0,0,0,0,0,0,3,6,0,0,0,0,0,20,0,0,0,21,0,22,0,0,0,0,0,0,0,0,23,0,0,25,0,29, +0,53,0,0,0,0,0,0,55,0,0,0,0,0,0,61,76,0,0,0,94,0,0,0,0,0,0,96,0,97,0,98,0,0,0,0, +0,0,0,99,101,106,108,0,0,0,0,0,110,0,111,112,0,113,118,124,0,0,0,0,0,125,128,0,0 +,0,0,129,0,0,131,0,0,0,0,0,0,132,0,0,135,0,0,0,137,0,0,0,0,0,138,139,0,0,0,0,0,0 +,0,142,143,144,0,0,0,0,0,145,0,0,0,146,149,151,152,0,0,153,0,0,0,0,0,0,0,0,0,0,0 +,0,0,0,0,154,0,0,0,0,0,0,155,0,0,0,0,160,182,0,0,0,0,0,0,183,0,0,0,188,189,0,0, +192,0,0,0,0,0,0,194,0,0,0,0,0,0,0,0,197,202,209,0,0,210,0,224,0,0,0,225,0,0,0,0, +0,0,0,0,0,0,231,0,0,0,232,0,240,0,0,242,0,0,0,0,0,0,0,0,0,0,0,244,0,0,0,246,0,0, +249,251,253,0,0,0,0,0,258,0,0,261,263,0,0,0,267,0,0,268,0,269,0,0,0,0,0,0,0,0,0, +271,0,0,0,0,0,0,272,0,273,0,277,0,278,286,0,0,0,0,287,0,289,290,291,0,0,0,295,0, +0,296,297,0,0,0,0,0,0,0,0,0,0,298,0,0,0,299,0,0,305,0,324,0,0,0,0,0,327,0,328, +329,0,0,0,0,336,0,0,340,0,341,342,343,0,0,346,0,348,0,0,0,0,0,0,349,351,0,0,355, +0,363,0,364,0,368,369,0,370,0,0,0,0,0,0,0,372,0,0,0,0,0,0,0,0,0,0,0,373,0,375,0, +0,0,0,376,377,0,0,394,395,396,0,0,398,0,0,0,0,400,0,0,408,0,0,0,0,420,0,0,0,0,0, +0,421,0,0,422,423,0,0,429,435,436,442,0,0,443,0,444,445,453,456,0,457,0,0,0,0,0, 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+11,148},{10,11,328},{11,11,159},{11,11,253},{11,11,506},{12,11,487},{12,11,531}, +{144,11,33},{136,10,760},{5,11,14},{5,11,892},{6,11,283},{7,11,234},{136,11,537} +,{135,11,1251},{4,11,126},{8,11,635},{147,11,34},{4,11,316},{135,11,1561},{6,0, +999},{6,0,1310},{137,11,861},{4,11,64},{5,11,352},{5,11,720},{6,11,368},{139,11, +359},{4,0,75},{5,0,180},{6,0,500},{7,0,58},{7,0,710},{10,0,645},{136,10,770},{ +133,0,649},{6,0,276},{7,0,282},{7,0,879},{7,0,924},{8,0,459},{9,0,599},{9,0,754} +,{11,0,574},{12,0,128},{12,0,494},{13,0,52},{13,0,301},{15,0,30},{143,0,132},{ +132,0,200},{4,10,89},{5,10,489},{6,10,315},{7,10,553},{7,10,1745},{138,10,243},{ +135,11,1050},{7,0,1621},{6,10,1658},{9,10,3},{10,10,154},{11,10,641},{13,10,85}, +{13,10,201},{141,10,346},{6,11,175},{137,11,289},{5,11,432},{133,11,913},{6,0, +225},{137,0,211},{7,0,718},{8,0,687},{139,0,374},{4,10,166},{133,10,505},{9,0, +110},{134,10,1670},{8,0,58},{9,0,724},{11,0,809},{13,0,113},{145,0,72},{6,0,345} +,{7,0,1247},{144,11,82},{5,11,931},{134,11,1698},{8,0,767},{8,0,803},{9,0,301},{ +137,0,903},{139,0,203},{134,0,1154},{7,0,1949},{136,0,674},{134,0,259},{135,0, +1275},{5,11,774},{6,11,1637},{6,11,1686},{134,11,1751},{134,0,1231},{7,10,445},{ +8,10,307},{8,10,704},{10,10,41},{10,10,439},{11,10,237},{11,10,622},{140,10,201} +,{136,0,254},{6,11,260},{135,11,1484},{139,0,277},{135,10,1977},{4,10,189},{5,10 +,713},{6,11,573},{136,10,57},{138,10,371},{132,10,552},{134,11,344},{133,0,248}, +{9,0,800},{10,0,693},{11,0,482},{11,0,734},{11,0,789},{134,11,240},{4,0,116},{5, +0,95},{5,0,445},{7,0,1688},{8,0,29},{9,0,272},{11,0,509},{11,0,915},{4,11,292},{ +4,11,736},{5,11,871},{6,11,171},{6,11,1689},{7,11,1324},{7,11,1944},{9,11,415},{ +9,11,580},{14,11,230},{146,11,68},{7,0,490},{13,0,100},{143,0,75},{135,0,1641},{ +133,0,543},{7,11,209},{8,11,661},{10,11,42},{11,11,58},{12,11,58},{12,11,118},{ +141,11,32},{5,0,181},{8,0,41},{6,11,63},{135,11,920},{133,0,657},{133,11,793},{ +138,0,709},{7,0,25},{8,0,202},{138,0,536},{5,11,665},{135,10,1788},{145,10,49},{ +9,0,423},{140,0,89},{5,11,67},{6,11,62},{6,11,374},{135,11,1391},{8,0,113},{9,0, +877},{10,0,554},{11,0,83},{12,0,136},{19,0,109},{9,11,790},{140,11,47},{138,10, +661},{4,0,963},{10,0,927},{14,0,442},{135,10,1945},{133,0,976},{132,0,206},{4,11 +,391},{135,11,1169},{134,0,2002},{6,0,696},{134,0,1008},{134,0,1170},{132,11,271 +},{7,0,13},{8,0,226},{10,0,537},{11,0,570},{11,0,605},{11,0,799},{11,0,804},{12, +0,85},{12,0,516},{12,0,623},{13,0,112},{13,0,361},{14,0,77},{14,0,78},{17,0,28}, +{19,0,110},{140,11,314},{132,0,769},{134,0,1544},{4,0,551},{137,0,678},{5,10,84} +,{134,10,163},{9,0,57},{9,0,459},{10,0,425},{11,0,119},{12,0,184},{12,0,371},{13 +,0,358},{145,0,51},{5,0,188},{5,0,814},{8,0,10},{9,0,421},{9,0,729},{10,0,609},{ +11,0,689},{4,11,253},{5,10,410},{5,11,544},{7,11,300},{137,11,340},{134,0,624},{ +138,11,321},{135,0,1941},{18,0,130},{5,10,322},{8,10,186},{9,10,262},{10,10,187} +,{142,10,208},{5,11,53},{5,11,541},{6,11,94},{6,11,499},{7,11,230},{139,11,321}, +{133,10,227},{4,0,378},{4,11,920},{5,11,25},{5,11,790},{6,11,457},{135,11,853},{ +137,0,269},{132,0,528},{134,0,1146},{7,10,1395},{8,10,486},{9,10,236},{9,10,878} +,{10,10,218},{11,10,95},{19,10,17},{147,10,31},{7,10,2043},{8,10,672},{141,10, +448},{134,0,1105},{134,0,1616},{134,11,1765},{140,11,163},{5,10,412},{133,11,822 +},{132,11,634},{6,0,656},{134,11,1730},{134,0,1940},{5,0,104},{6,0,173},{135,0, +1631},{136,10,562},{6,11,36},{7,11,658},{8,11,454},{147,11,86},{5,0,457},{134,10 +,1771},{7,0,810},{8,0,138},{8,0,342},{9,0,84},{10,0,193},{11,0,883},{140,0,359}, +{9,0,620},{135,10,1190},{137,10,132},{7,11,975},{137,11,789},{6,0,95},{6,0,1934} +,{136,0,967},{141,11,335},{6,0,406},{10,0,409},{10,0,447},{11,0,44},{140,0,100}, +{4,10,317},{135,10,1279},{132,0,477},{134,0,1268},{6,0,1941},{8,0,944},{5,10,63} +,{133,10,509},{132,0,629},{132,11,104},{4,0,246},{133,0,375},{6,0,1636},{132,10, 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+1700},{7,11,26},{7,11,293},{7,11,382},{7,11,1026},{7,11,1087},{7,11,2027},{8,11, +24},{8,11,114},{8,11,252},{8,11,727},{8,11,729},{9,11,30},{9,11,199},{9,11,231}, +{9,11,251},{9,11,334},{9,11,361},{9,11,488},{9,11,712},{10,11,55},{10,11,60},{10 +,11,232},{10,11,332},{10,11,384},{10,11,396},{10,11,504},{10,11,542},{10,11,652} +,{11,11,20},{11,11,48},{11,11,207},{11,11,291},{11,11,298},{11,11,342},{11,11, +365},{11,11,394},{11,11,620},{11,11,705},{11,11,1017},{12,11,123},{12,11,340},{ +12,11,406},{12,11,643},{13,11,61},{13,11,269},{13,11,311},{13,11,319},{13,11,486 +},{14,11,234},{15,11,62},{15,11,85},{16,11,71},{18,11,119},{148,11,105},{6,0, +1455},{150,11,37},{135,10,1927},{135,0,1911},{137,0,891},{7,10,1756},{137,10,98} +,{7,10,1046},{139,10,160},{132,0,761},{6,11,379},{7,11,270},{7,11,1116},{8,11, +176},{8,11,183},{9,11,432},{9,11,661},{12,11,247},{12,11,617},{146,11,125},{6,10 +,45},{7,10,433},{8,10,129},{9,10,21},{10,10,392},{11,10,79},{12,10,499},{13,10, +199},{141,10,451},{4,0,407},{5,11,792},{133,11,900},{132,0,560},{135,0,183},{13, +0,490},{7,10,558},{136,10,353},{4,0,475},{6,0,731},{11,0,35},{13,0,71},{13,0,177 +},{14,0,422},{133,10,785},{8,10,81},{9,10,189},{9,10,201},{11,10,478},{11,10,712 +},{141,10,338},{4,0,418},{4,0,819},{133,10,353},{151,10,26},{4,11,901},{133,11, +776},{132,0,575},{7,0,818},{16,0,92},{17,0,14},{17,0,45},{18,0,75},{148,0,18},{6 +,0,222},{7,0,636},{7,0,1620},{8,0,409},{9,0,693},{139,0,77},{6,10,25},{7,10,855} +,{7,10,1258},{144,10,32},{6,0,1880},{6,0,1887},{6,0,1918},{6,0,1924},{9,0,967},{ +9,0,995},{9,0,1015},{12,0,826},{12,0,849},{12,0,857},{12,0,860},{12,0,886},{12,0 +,932},{18,0,228},{18,0,231},{146,0,240},{134,0,633},{134,0,1308},{4,11,37},{5,11 +,334},{135,11,1253},{10,0,86},{4,10,4},{7,10,1118},{7,10,1320},{7,10,1706},{8,10 +,277},{9,10,622},{11,10,724},{12,10,350},{12,10,397},{13,10,28},{13,10,159},{15, +10,89},{18,10,5},{19,10,9},{20,10,34},{150,10,47},{132,11,508},{137,11,448},{12, +11,107},{146,11,31},{132,0,817},{134,0,663},{133,0,882},{134,0,914},{132,11,540} +,{132,11,533},{136,11,608},{8,0,885},{138,0,865},{132,0,426},{6,0,58},{7,0,745}, +{7,0,1969},{8,0,399},{8,0,675},{9,0,479},{9,0,731},{10,0,330},{10,0,593},{10,0, +817},{11,0,32},{11,0,133},{11,0,221},{145,0,68},{134,10,255},{7,0,102},{137,0, +538},{137,10,216},{7,11,253},{136,11,549},{135,11,912},{9,10,183},{139,10,286},{ +11,10,956},{151,10,3},{8,11,527},{18,11,60},{147,11,24},{4,10,536},{7,10,1141},{ +10,10,723},{139,10,371},{133,11,920},{7,0,876},{135,10,285},{135,10,560},{132,10 +,690},{142,11,126},{11,10,33},{12,10,571},{149,10,1},{133,0,566},{9,0,139},{10,0 +,399},{11,0,469},{12,0,634},{13,0,223},{132,11,483},{6,0,48},{135,0,63},{18,0,12 +},{7,10,1862},{12,10,491},{12,10,520},{13,10,383},{142,10,244},{135,11,1665},{ +132,11,448},{9,11,495},{146,11,104},{6,0,114},{7,0,1224},{7,0,1556},{136,0,3},{4 +,10,190},{133,10,554},{8,0,576},{9,0,267},{133,10,1001},{133,10,446},{133,0,933} +,{139,11,1009},{8,11,653},{13,11,93},{147,11,14},{6,0,692},{6,0,821},{134,0,1077 +},{5,11,172},{135,11,801},{138,0,752},{4,0,375},{134,0,638},{134,0,1011},{140,11 +,540},{9,0,96},{133,11,260},{139,11,587},{135,10,1231},{12,0,30},{13,0,148},{14, +0,87},{14,0,182},{16,0,42},{20,0,70},{132,10,304},{6,0,1398},{7,0,56},{7,0,1989} +,{8,0,337},{8,0,738},{9,0,600},{12,0,37},{13,0,447},{142,0,92},{138,0,666},{5,0, +394},{7,0,487},{136,0,246},{9,0,437},{6,10,53},{6,10,199},{7,10,1408},{8,10,32}, +{8,10,93},{10,10,397},{10,10,629},{11,10,593},{11,10,763},{13,10,326},{145,10,35 +},{134,10,105},{9,0,320},{10,0,506},{138,10,794},{7,11,57},{8,11,167},{8,11,375} +,{9,11,82},{9,11,561},{10,11,620},{10,11,770},{11,10,704},{141,10,396},{6,0,1003 +},{5,10,114},{5,10,255},{141,10,285},{7,0,866},{135,0,1163},{133,11,531},{132,0, +328},{7,10,2035},{8,10,19},{9,10,89},{138,10,831},{8,11,194},{136,11,756},{136,0 +,1000},{5,11,453},{134,11,441},{4,0,101},{5,0,833},{7,0,1171},{136,0,744},{133,0 +,726},{136,10,746},{138,0,176},{6,0,9},{6,0,397},{7,0,53},{7,0,1742},{10,0,632}, +{11,0,828},{140,0,146},{135,11,22},{145,11,64},{132,0,839},{11,0,417},{12,0,223} +,{140,0,265},{4,11,102},{7,11,815},{7,11,1699},{139,11,964},{5,10,955},{136,10, +814},{6,0,1931},{6,0,2007},{18,0,246},{146,0,247},{8,0,198},{11,0,29},{140,0,534 +},{135,0,1771},{6,0,846},{7,11,1010},{11,11,733},{11,11,759},{12,11,563},{13,11, +34},{14,11,101},{18,11,45},{146,11,129},{4,0,186},{5,0,157},{8,0,168},{138,0,6}, +{132,11,899},{133,10,56},{148,10,100},{133,0,875},{5,0,773},{5,0,991},{6,0,1635} +,{134,0,1788},{6,0,1274},{9,0,477},{141,0,78},{4,0,639},{7,0,111},{8,0,581},{12, +0,177},{6,11,52},{9,11,104},{9,11,559},{10,10,4},{10,10,13},{11,10,638},{12,11, +308},{19,11,87},{148,10,57},{132,11,604},{4,11,301},{133,10,738},{133,10,758},{ +134,0,1747},{7,11,1440},{11,11,854},{11,11,872},{11,11,921},{12,11,551},{13,11, +472},{142,11,367},{7,0,1364},{7,0,1907},{141,0,158},{134,0,873},{4,0,404},{4,0, +659},{7,0,552},{135,0,675},{135,10,1112},{139,10,328},{7,11,508},{137,10,133},{ +133,0,391},{5,10,110},{6,10,169},{6,10,1702},{7,10,400},{8,10,538},{9,10,184},{9 +,10,524},{140,10,218},{6,11,310},{7,11,1849},{8,11,72},{8,11,272},{8,11,431},{9, +11,12},{9,11,351},{10,11,563},{10,11,630},{10,11,810},{11,11,367},{11,11,599},{ +11,11,686},{140,11,672},{5,0,540},{6,0,1697},{136,0,668},{132,0,883},{134,0,78}, +{12,0,628},{18,0,79},{6,10,133},{9,10,353},{139,10,993},{6,11,181},{7,11,537},{8 +,11,64},{9,11,127},{10,11,496},{12,11,510},{141,11,384},{6,10,93},{7,10,1422},{7 +,10,1851},{8,10,673},{9,10,529},{140,10,43},{137,10,371},{134,0,1460},{134,0,962 +},{4,11,244},{135,11,233},{9,10,25},{10,10,467},{138,10,559},{4,10,335},{135,10, +942},{133,0,460},{135,11,334},{134,11,1650},{4,0,199},{139,0,34},{5,10,601},{8, +10,39},{10,10,773},{11,10,84},{12,10,205},{142,10,1},{133,10,870},{134,0,388},{ +14,0,474},{148,0,120},{133,11,369},{139,0,271},{4,0,511},{9,0,333},{9,0,379},{10 +,0,602},{11,0,441},{11,0,723},{11,0,976},{12,0,357},{132,10,181},{134,0,608},{ +134,10,1652},{22,0,49},{137,11,338},{140,0,988},{134,0,617},{5,0,938},{136,0,707 +},{132,10,97},{5,10,147},{6,10,286},{7,10,1362},{141,10,176},{6,0,756},{134,0, +1149},{133,11,896},{6,10,375},{7,10,169},{7,10,254},{136,10,780},{134,0,1583},{ +135,10,1447},{139,0,285},{7,11,1117},{8,11,393},{136,11,539},{135,0,344},{6,0, +469},{7,0,1709},{138,0,515},{5,10,629},{135,10,1549},{5,11,4},{5,11,810},{6,11, +13},{6,11,538},{6,11,1690},{6,11,1726},{7,11,499},{7,11,1819},{8,11,148},{8,11, +696},{8,11,791},{12,11,125},{13,11,54},{143,11,9},{135,11,1268},{137,0,404},{132 +,0,500},{5,0,68},{134,0,383},{11,0,216},{139,0,340},{4,11,925},{5,11,803},{8,11, +698},{138,11,828},{4,0,337},{6,0,353},{7,0,1934},{8,0,488},{137,0,429},{7,0,236} +,{7,0,1795},{8,0,259},{9,0,135},{9,0,177},{9,0,860},{10,0,825},{11,0,115},{11,0, +370},{11,0,405},{11,0,604},{12,0,10},{12,0,667},{12,0,669},{13,0,76},{14,0,310}, +{15,0,76},{15,0,147},{148,0,23},{4,0,15},{4,0,490},{5,0,22},{6,0,244},{7,0,40},{ +7,0,200},{7,0,906},{7,0,1199},{9,0,616},{10,0,716},{11,0,635},{11,0,801},{140,0, +458},{12,0,756},{132,10,420},{134,0,1504},{6,0,757},{133,11,383},{6,0,1266},{135 +,0,1735},{5,0,598},{7,0,791},{8,0,108},{9,0,123},{7,10,1570},{140,10,542},{142, +11,410},{9,11,660},{138,11,347} +}; + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_STATIC_DICT_LUT_H_ */ diff --git a/modules/brotli/enc/utf8_util.c b/modules/brotli/enc/utf8_util.c new file mode 100644 index 000000000..04a780516 --- /dev/null +++ b/modules/brotli/enc/utf8_util.c @@ -0,0 +1,85 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Heuristics for deciding about the UTF8-ness of strings. */ + +#include "./utf8_util.h" + +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static size_t BrotliParseAsUTF8( + int* symbol, const uint8_t* input, size_t size) { + /* ASCII */ + if ((input[0] & 0x80) == 0) { + *symbol = input[0]; + if (*symbol > 0) { + return 1; + } + } + /* 2-byte UTF8 */ + if (size > 1u && + (input[0] & 0xE0) == 0xC0 && + (input[1] & 0xC0) == 0x80) { + *symbol = (((input[0] & 0x1F) << 6) | + (input[1] & 0x3F)); + if (*symbol > 0x7F) { + return 2; + } + } + /* 3-byte UFT8 */ + if (size > 2u && + (input[0] & 0xF0) == 0xE0 && + (input[1] & 0xC0) == 0x80 && + (input[2] & 0xC0) == 0x80) { + *symbol = (((input[0] & 0x0F) << 12) | + ((input[1] & 0x3F) << 6) | + (input[2] & 0x3F)); + if (*symbol > 0x7FF) { + return 3; + } + } + /* 4-byte UFT8 */ + if (size > 3u && + (input[0] & 0xF8) == 0xF0 && + (input[1] & 0xC0) == 0x80 && + (input[2] & 0xC0) == 0x80 && + (input[3] & 0xC0) == 0x80) { + *symbol = (((input[0] & 0x07) << 18) | + ((input[1] & 0x3F) << 12) | + ((input[2] & 0x3F) << 6) | + (input[3] & 0x3F)); + if (*symbol > 0xFFFF && *symbol <= 0x10FFFF) { + return 4; + } + } + /* Not UTF8, emit a special symbol above the UTF8-code space */ + *symbol = 0x110000 | input[0]; + return 1; +} + +/* Returns 1 if at least min_fraction of the data is UTF8-encoded.*/ +BROTLI_BOOL BrotliIsMostlyUTF8( + const uint8_t* data, const size_t pos, const size_t mask, + const size_t length, const double min_fraction) { + size_t size_utf8 = 0; + size_t i = 0; + while (i < length) { + int symbol; + size_t bytes_read = + BrotliParseAsUTF8(&symbol, &data[(pos + i) & mask], length - i); + i += bytes_read; + if (symbol < 0x110000) size_utf8 += bytes_read; + } + return TO_BROTLI_BOOL(size_utf8 > min_fraction * (double)length); +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/enc/utf8_util.h b/modules/brotli/enc/utf8_util.h new file mode 100644 index 000000000..8fda80c22 --- /dev/null +++ b/modules/brotli/enc/utf8_util.h @@ -0,0 +1,32 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Heuristics for deciding about the UTF8-ness of strings. */ + +#ifndef BROTLI_ENC_UTF8_UTIL_H_ +#define BROTLI_ENC_UTF8_UTIL_H_ + +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +static const double kMinUTF8Ratio = 0.75; + +/* Returns 1 if at least min_fraction of the bytes between pos and + pos + length in the (data, mask) ring-buffer is UTF8-encoded, otherwise + returns 0. */ +BROTLI_INTERNAL BROTLI_BOOL BrotliIsMostlyUTF8( + const uint8_t* data, const size_t pos, const size_t mask, + const size_t length, const double min_fraction); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_UTF8_UTIL_H_ */ diff --git a/modules/brotli/enc/write_bits.h b/modules/brotli/enc/write_bits.h new file mode 100644 index 000000000..36515a689 --- /dev/null +++ b/modules/brotli/enc/write_bits.h @@ -0,0 +1,85 @@ +/* Copyright 2010 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Write bits into a byte array. */ + +#ifndef BROTLI_ENC_WRITE_BITS_H_ +#define BROTLI_ENC_WRITE_BITS_H_ + +#include "../common/platform.h" +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/*#define BIT_WRITER_DEBUG */ + +/* This function writes bits into bytes in increasing addresses, and within + a byte least-significant-bit first. + + The function can write up to 56 bits in one go with WriteBits + Example: let's assume that 3 bits (Rs below) have been written already: + + BYTE-0 BYTE+1 BYTE+2 + + 0000 0RRR 0000 0000 0000 0000 + + Now, we could write 5 or less bits in MSB by just sifting by 3 + and OR'ing to BYTE-0. + + For n bits, we take the last 5 bits, OR that with high bits in BYTE-0, + and locate the rest in BYTE+1, BYTE+2, etc. */ +static BROTLI_INLINE void BrotliWriteBits(size_t n_bits, + uint64_t bits, + size_t* BROTLI_RESTRICT pos, + uint8_t* BROTLI_RESTRICT array) { +#if defined(BROTLI_LITTLE_ENDIAN) + /* This branch of the code can write up to 56 bits at a time, + 7 bits are lost by being perhaps already in *p and at least + 1 bit is needed to initialize the bit-stream ahead (i.e. if 7 + bits are in *p and we write 57 bits, then the next write will + access a byte that was never initialized). */ + uint8_t* p = &array[*pos >> 3]; + uint64_t v = (uint64_t)(*p); /* Zero-extend 8 to 64 bits. */ + BROTLI_LOG(("WriteBits %2d 0x%08x%08x %10d\n", (int)n_bits, + (uint32_t)(bits >> 32), (uint32_t)(bits & 0xFFFFFFFF), + (int)*pos)); + BROTLI_DCHECK((bits >> n_bits) == 0); + BROTLI_DCHECK(n_bits <= 56); + v |= bits << (*pos & 7); + BROTLI_UNALIGNED_STORE64LE(p, v); /* Set some bits. */ + *pos += n_bits; +#else + /* implicit & 0xFF is assumed for uint8_t arithmetics */ + uint8_t* array_pos = &array[*pos >> 3]; + const size_t bits_reserved_in_first_byte = (*pos & 7); + size_t bits_left_to_write; + bits <<= bits_reserved_in_first_byte; + *array_pos++ |= (uint8_t)bits; + for (bits_left_to_write = n_bits + bits_reserved_in_first_byte; + bits_left_to_write >= 9; + bits_left_to_write -= 8) { + bits >>= 8; + *array_pos++ = (uint8_t)bits; + } + *array_pos = 0; + *pos += n_bits; +#endif +} + +static BROTLI_INLINE void BrotliWriteBitsPrepareStorage( + size_t pos, uint8_t* array) { + BROTLI_LOG(("WriteBitsPrepareStorage %10d\n", (int)pos)); + BROTLI_DCHECK((pos & 7) == 0); + array[pos >> 3] = 0; +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_WRITE_BITS_H_ */ |