1 files changed, 136 insertions, 0 deletions
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