Add Basilisk

1 files changed, 620 insertions, 0 deletions

diff --git a/application/basilisk/components/translation/cld2/internal/cldutil.cc b/application/basilisk/components/translation/cld2/internal/cldutil.cc
new file mode 100644
index 000000000..ecda9a53e
--- /dev/null
+++ b/application/basilisk/components/translation/cld2/internal/cldutil.cc
@@ -0,0 +1,620 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//
+// Author: dsites@google.com (Dick Sites)
+// Updated 2014.01 for dual table lookup
+//
+
+#include "cldutil.h"
+#include <string>
+
+#include "cld2tablesummary.h"
+#include "integral_types.h"
+#include "port.h"
+#include "utf8statetable.h"
+
+namespace CLD2 {
+
+// Caller supplies the right tables in scoringcontext
+
+// Runtime routines for hashing, looking up, and scoring
+// unigrams (CJK), bigrams (CJK), quadgrams, and octagrams.
+// Unigrams and bigrams are for CJK languages only, including simplified/
+// traditional Chinese, Japanese, Korean, Vietnamese Han characters, and
+// Zhuang Han characters. Surrounding spaces are not considered.
+// Quadgrams and octagrams for for non-CJK and include two bits indicating
+// preceding and trailing spaces (word boundaries).
+
+
+static const int kMinCJKUTF8CharBytes = 3;
+
+static const int kMinGramCount = 3;
+static const int kMaxGramCount = 16;
+
+static const int UTFmax = 4;        // Max number of bytes in a UTF-8 character
+
+  // 1 to skip ASCII space, vowels AEIOU aeiou and UTF-8 continuation bytes 80-BF
+  static const uint8 kSkipSpaceVowelContinue[256] = {
+    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,
+    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,
+    0,1,0,0,0,1,0,0, 0,1,0,0,0,0,0,1, 0,0,0,0,0,1,0,0, 0,0,0,0,0,0,0,0,
+    0,1,0,0,0,1,0,0, 0,1,0,0,0,0,0,1, 0,0,0,0,0,1,0,0, 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, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
+    0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 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,
+  };
+
+  // 1 to skip ASCII space, and UTF-8 continuation bytes 80-BF
+  static const uint8 kSkipSpaceContinue[256] = {
+    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,
+    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, 0,0,0,0,0,0,0,0,
+    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,
+
+    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, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
+    0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 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,
+  };
+
+
+  // Always advances one UTF-8 character
+  static const uint8 kAdvanceOneChar[256] = {
+    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, 1,1,1,1,1,1,1,1, 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, 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,
+
+    1,1,1,1,1,1,1,1, 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, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
+    2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,
+    3,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4, 4,4,4,4,4,4,4,4,
+  };
+
+  // Advances *only* on space (or illegal byte)
+  static const uint8 kAdvanceOneCharSpace[256] = {
+    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,
+    1,0,0,0,0,0,0,0, 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,
+    0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
+
+    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, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
+    0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 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,
+  };
+
+
+// Routines to access a hash table of <key:wordhash, value:probs> pairs
+// Buckets have 4-byte wordhash for sizes < 32K buckets, but only
+// 2-byte wordhash for sizes >= 32K buckets, with other wordhash bits used as
+// bucket subscript.
+// Probs is a packed: three languages plus a subscript for probability table
+// Buckets have all the keys together, then all the values.Key array never
+// crosses a cache-line boundary, so no-match case takes exactly one cache miss.
+// Match case may sometimes take an additional cache miss on value access.
+//
+// Other possibilites include 5 or 10 6-byte entries plus pad to make 32 or 64
+// byte buckets with single cache miss.
+// Or 2-byte key and 6-byte value, allowing 5 languages instead  of three.
+//------------------------------------------------------------------------------
+
+//----------------------------------------------------------------------------//
+// Hashing groups of 1/2/4/8 letters, perhaps with spaces or underscores      //
+//----------------------------------------------------------------------------//
+
+//----------------------------------------------------------------------------//
+// Scoring single groups of letters                                           //
+//----------------------------------------------------------------------------//
+
+// BIGRAM, QUADGRAM, OCTAGRAM score one => tote
+// Input: 4-byte entry of 3 language numbers and one probability subscript, plus
+//  an accumulator tote. (language 0 means unused entry)
+// Output: running sums in tote updated
+void ProcessProbV2Tote(uint32 probs, Tote* tote) {
+  uint8 prob123 = (probs >> 0) & 0xff;
+  const uint8* prob123_entry = LgProb2TblEntry(prob123);
+
+  uint8 top1 = (probs >> 8) & 0xff;
+  if (top1 > 0) {tote->Add(top1, LgProb3(prob123_entry, 0));}
+  uint8 top2 = (probs >> 16) & 0xff;
+  if (top2 > 0) {tote->Add(top2, LgProb3(prob123_entry, 1));}
+  uint8 top3 = (probs >> 24) & 0xff;
+  if (top3 > 0) {tote->Add(top3, LgProb3(prob123_entry, 2));}
+}
+
+// Return score for a particular per-script language, or zero
+int GetLangScore(uint32 probs, uint8 pslang) {
+  uint8 prob123 = (probs >> 0) & 0xff;
+  const uint8* prob123_entry = LgProb2TblEntry(prob123);
+  int retval = 0;
+  uint8 top1 = (probs >> 8) & 0xff;
+  if (top1 == pslang) {retval += LgProb3(prob123_entry, 0);}
+  uint8 top2 = (probs >> 16) & 0xff;
+  if (top2 == pslang) {retval += LgProb3(prob123_entry, 1);}
+  uint8 top3 = (probs >> 24) & 0xff;
+  if (top3 == pslang) {retval += LgProb3(prob123_entry, 2);}
+  return retval;
+}
+
+//----------------------------------------------------------------------------//
+// Routines to accumulate probabilities                                       //
+//----------------------------------------------------------------------------//
+
+
+// BIGRAM, using hash table, always advancing by 1 char
+// Caller supplies table, such as &kCjkBiTable_obj or &kGibberishTable_obj
+// Score all bigrams in isrc, using languages that have bigrams (CJK)
+// Return number of bigrams that hit in the hash table
+int DoBigramScoreV3(const CLD2TableSummary* bigram_obj,
+                         const char* isrc, int srclen, Tote* chunk_tote) {
+  int hit_count = 0;
+  const char* src = isrc;
+
+  // Hashtable-based CJK bigram lookup
+  const uint8* usrc = reinterpret_cast<const uint8*>(src);
+  const uint8* usrclimit1 = usrc + srclen - UTFmax;
+
+  while (usrc < usrclimit1) {
+    int len = kAdvanceOneChar[usrc[0]];
+    int len2 = kAdvanceOneChar[usrc[len]] + len;
+
+    if ((kMinCJKUTF8CharBytes * 2) <= len2) {      // Two CJK chars possible
+      // Lookup and score this bigram
+      // Always ignore pre/post spaces
+      uint32 bihash = BiHashV2(reinterpret_cast<const char*>(usrc), len2);
+      uint32 probs = QuadHashV3Lookup4(bigram_obj, bihash);
+      // Now go indirect on the subscript
+      probs = bigram_obj->kCLDTableInd[probs &
+        ~bigram_obj->kCLDTableKeyMask];
+
+      // Process the bigram
+      if (probs != 0) {
+        ProcessProbV2Tote(probs, chunk_tote);
+        ++hit_count;
+      }
+    }
+    usrc += len;  // Advance by one char
+  }
+
+  return hit_count;
+}
+
+
+// Score up to 64KB of a single script span in one pass
+// Make a dummy entry off the end to calc length of last span
+// Return offset of first unused input byte
+int GetUniHits(const char* text,
+                     int letter_offset, int letter_limit,
+                     ScoringContext* scoringcontext,
+                     ScoringHitBuffer* hitbuffer) {
+  const char* isrc = &text[letter_offset];
+  const char* src = isrc;
+  // Limit is end, which has extra 20 20 20 00 past len
+  const char* srclimit = &text[letter_limit];
+
+  // Local copies
+  const UTF8PropObj* unigram_obj =
+    scoringcontext->scoringtables->unigram_obj;
+  int next_base = hitbuffer->next_base;
+  int next_base_limit = hitbuffer->maxscoringhits;
+
+  // Visit all unigrams
+  if (src[0] == ' ') {++src;}   // skip any initial space
+  while (src < srclimit) {
+    const uint8* usrc = reinterpret_cast<const uint8*>(src);
+    int len = kAdvanceOneChar[usrc[0]];
+    src += len;
+    // Look up property of one UTF-8 character and advance over it.
+    // Updates usrc and len (bad interface design), hence increment above
+    int propval = UTF8GenericPropertyBigOneByte(unigram_obj, &usrc, &len);
+    if (propval > 0) {
+      // Save indirect subscript for later scoring; 1 or 2 langprobs
+      int indirect_subscr = propval;
+      hitbuffer->base[next_base].offset = src - text;     // Offset in text
+      hitbuffer->base[next_base].indirect = indirect_subscr;
+      ++next_base;
+    }
+
+    if (next_base >= next_base_limit) {break;}
+  }
+
+  hitbuffer->next_base = next_base;
+
+  // Make a dummy entry off the end to calc length of last span
+  int dummy_offset = src - text;
+  hitbuffer->base[hitbuffer->next_base].offset = dummy_offset;
+  hitbuffer->base[hitbuffer->next_base].indirect = 0;
+
+  return src - text;
+}
+
+// Score up to 64KB of a single script span, doing both delta-bi and
+// distinct bis in one pass
+void GetBiHits(const char* text,
+                     int letter_offset, int letter_limit,
+                     ScoringContext* scoringcontext,
+                     ScoringHitBuffer* hitbuffer) {
+  const char* isrc = &text[letter_offset];
+  const char* src = isrc;
+  // Limit is end
+  const char* srclimit1 = &text[letter_limit];
+
+  // Local copies
+  const CLD2TableSummary* deltabi_obj =
+    scoringcontext->scoringtables->deltabi_obj;
+  const CLD2TableSummary* distinctbi_obj =
+    scoringcontext->scoringtables->distinctbi_obj;
+  int next_delta = hitbuffer->next_delta;
+  int next_delta_limit = hitbuffer->maxscoringhits;
+  int next_distinct = hitbuffer->next_distinct;
+  // We can do 2 inserts per loop, so -1
+  int next_distinct_limit = hitbuffer->maxscoringhits - 1;
+
+  while (src < srclimit1) {
+    const uint8* usrc = reinterpret_cast<const uint8*>(src);
+    int len = kAdvanceOneChar[usrc[0]];
+    int len2 = kAdvanceOneChar[usrc[len]] + len;
+
+    if ((kMinCJKUTF8CharBytes * 2) <= len2) {      // Two CJK chars possible
+      // Lookup and this bigram and save <offset, indirect>
+      uint32 bihash = BiHashV2(src, len2);
+      uint32 probs = QuadHashV3Lookup4(deltabi_obj, bihash);
+      // Now go indirect on the subscript
+      if (probs != 0) {
+        // Save indirect subscript for later scoring; 1 langprob
+        int indirect_subscr = probs & ~deltabi_obj->kCLDTableKeyMask;
+        hitbuffer->delta[next_delta].offset = src - text;
+        hitbuffer->delta[next_delta].indirect = indirect_subscr;
+        ++next_delta;
+      }
+      // Lookup this distinct bigram and save <offset, indirect>
+      probs = QuadHashV3Lookup4(distinctbi_obj, bihash);
+      if (probs != 0) {
+        int indirect_subscr = probs & ~distinctbi_obj->kCLDTableKeyMask;
+        hitbuffer->distinct[next_distinct].offset = src - text;
+        hitbuffer->distinct[next_distinct].indirect = indirect_subscr;
+        ++next_distinct;
+      }
+    }
+    src += len;  // Advance by one char (not two)
+
+    // Almost always srclimit hit first
+    if (next_delta >= next_delta_limit) {break;}
+    if (next_distinct >= next_distinct_limit) {break;}
+  }
+
+  hitbuffer->next_delta = next_delta;
+  hitbuffer->next_distinct = next_distinct;
+
+  // Make a dummy entry off the end to calc length of last span
+  int dummy_offset = src - text;
+  hitbuffer->delta[hitbuffer->next_delta].offset = dummy_offset;
+  hitbuffer->delta[hitbuffer->next_delta].indirect = 0;
+  hitbuffer->distinct[hitbuffer->next_distinct].offset = dummy_offset;
+  hitbuffer->distinct[hitbuffer->next_distinct].indirect = 0;
+}
+
+// Score up to 64KB of a single script span in one pass
+// Make a dummy entry off the end to calc length of last span
+// Return offset of first unused input byte
+int GetQuadHits(const char* text,
+                     int letter_offset, int letter_limit,
+                     ScoringContext* scoringcontext,
+                     ScoringHitBuffer* hitbuffer) {
+  const char* isrc = &text[letter_offset];
+  const char* src = isrc;
+  // Limit is end, which has extra 20 20 20 00 past len
+  const char* srclimit = &text[letter_limit];
+
+  // Local copies
+  const CLD2TableSummary* quadgram_obj =
+    scoringcontext->scoringtables->quadgram_obj;
+  const CLD2TableSummary* quadgram_obj2 =
+    scoringcontext->scoringtables->quadgram_obj2;
+  int next_base = hitbuffer->next_base;
+  int next_base_limit = hitbuffer->maxscoringhits;
+
+  // Run a little cache of last quad hits to catch overly-repetitive "text"
+  // We don't care if we miss a couple repetitions at scriptspan boundaries
+  int next_prior_quadhash = 0;
+  uint32 prior_quadhash[2] = {0, 0};
+
+  // Visit all quadgrams
+  if (src[0] == ' ') {++src;}   // skip any initial space
+  while (src < srclimit) {
+    // Find one quadgram
+    const char* src_end = src;
+    src_end += kAdvanceOneCharButSpace[(uint8)src_end[0]];
+    src_end += kAdvanceOneCharButSpace[(uint8)src_end[0]];
+    const char* src_mid = src_end;
+    src_end += kAdvanceOneCharButSpace[(uint8)src_end[0]];
+    src_end += kAdvanceOneCharButSpace[(uint8)src_end[0]];
+    int len = src_end - src;
+    // Hash the quadgram
+    uint32 quadhash = QuadHashV2(src, len);
+
+    // Filter out recent repeats
+    if ((quadhash != prior_quadhash[0]) && (quadhash != prior_quadhash[1])) {
+      // Look up this quadgram and save <offset, indirect>
+      uint32 indirect_flag = 0;   // For dual tables
+      const CLD2TableSummary* hit_obj = quadgram_obj;
+      uint32 probs = QuadHashV3Lookup4(quadgram_obj, quadhash);
+      if ((probs == 0) && (quadgram_obj2->kCLDTableSize != 0)) {
+        // Try lookup in dual table if not found in first one
+        // Note: we need to know later which of two indirect tables to use.
+        indirect_flag = 0x80000000u;
+        hit_obj = quadgram_obj2;
+        probs = QuadHashV3Lookup4(quadgram_obj2, quadhash);
+      }
+      if (probs != 0) {
+        // Round-robin two entries of actual hits
+        prior_quadhash[next_prior_quadhash] = quadhash;
+        next_prior_quadhash = (next_prior_quadhash + 1) & 1;
+
+        // Save indirect subscript for later scoring; 1 or 2 langprobs
+        int indirect_subscr = probs & ~hit_obj->kCLDTableKeyMask;
+        hitbuffer->base[next_base].offset = src - text;     // Offset in text
+        // Flip the high bit for table2
+        hitbuffer->base[next_base].indirect = indirect_subscr | indirect_flag;
+        ++next_base;
+      }
+    }
+
+    // Advance: all the way past word if at end-of-word, else 2 chars
+    if (src_end[0] == ' ') {
+      src = src_end;
+    } else {
+      src = src_mid;
+    }
+
+    // Skip over space at end of word, or ASCII vowel in middle of word
+    // Use kAdvanceOneCharSpace instead to get rid of vowel hack
+    if (src < srclimit) {
+      src += kAdvanceOneCharSpaceVowel[(uint8)src[0]];
+    } else {
+      // Advancing by 4/8/16 can overshoot, but we are about to exit anyway
+      src = srclimit;
+    }
+
+    if (next_base >= next_base_limit) {break;}
+  }
+
+  hitbuffer->next_base = next_base;
+
+  // Make a dummy entry off the end to calc length of last span
+  int dummy_offset = src - text;
+  hitbuffer->base[hitbuffer->next_base].offset = dummy_offset;
+  hitbuffer->base[hitbuffer->next_base].indirect = 0;
+
+  return src - text;
+}
+
+// inputs:
+//  const tables
+//  const char* isrc, int srclen (in sscriptbuffer)
+// intermediates:
+//  vector of octa <offset, probs>   (which need indirect table to decode)
+//  vector of distinct <offset, probs>   (which need indirect table to decode)
+
+// Score up to 64KB of a single script span, doing both delta-octa and
+// distinct words in one pass
+void GetOctaHits(const char* text,
+                     int letter_offset, int letter_limit,
+                     ScoringContext* scoringcontext,
+                     ScoringHitBuffer* hitbuffer) {
+  const char* isrc = &text[letter_offset];
+  const char* src = isrc;
+  // Limit is end+1, to include extra space char (0x20) off the end
+  const char* srclimit = &text[letter_limit + 1];
+
+  // Local copies
+  const CLD2TableSummary* deltaocta_obj =
+    scoringcontext->scoringtables->deltaocta_obj;
+  int next_delta = hitbuffer->next_delta;
+  int next_delta_limit = hitbuffer->maxscoringhits;
+
+  const CLD2TableSummary* distinctocta_obj =
+    scoringcontext->scoringtables->distinctocta_obj;
+  int next_distinct = hitbuffer->next_distinct;
+  // We can do 2 inserts per loop, so -1
+  int next_distinct_limit = hitbuffer->maxscoringhits - 1;
+
+  // Run a little cache of last octa hits to catch overly-repetitive "text"
+  // We don't care if we miss a couple repetitions at scriptspan boundaries
+  int next_prior_octahash = 0;
+  uint64 prior_octahash[2] = {0, 0};
+
+  // Score all words truncated to 8 characters
+  int charcount = 0;
+  // Skip any initial space
+  if (src[0] == ' ') {++src;}
+
+  // Begin the first word
+  const char* prior_word_start = src;
+  const char* word_start = src;
+  const char* word_end = word_start;
+  while (src < srclimit) {
+    // Terminate previous word or continue current word
+    if (src[0] == ' ') {
+      int len = word_end - word_start;
+      // Hash the word
+      uint64 wordhash40 = OctaHash40(word_start, len);
+      uint32 probs;
+
+      // Filter out recent repeats. Unlike quads, we update even if no hit,
+      // so we can get hits on same word if separated by non-hit words
+      if ((wordhash40 != prior_octahash[0]) &&
+          (wordhash40 != prior_octahash[1])) {
+        // Round-robin two entries of words
+        prior_octahash[next_prior_octahash] = wordhash40;
+        next_prior_octahash = 1 - next_prior_octahash;    // Alternates 0,1,0,1
+
+        // (1) Lookup distinct word PAIR. For a pair, we want an asymmetrical
+        // function of the two word hashs. For words A B C, B-A and C-B are good
+        // enough and fast. We use the same table as distinct single words
+        // Do not look up a pair of identical words -- all pairs hash to zero
+        // Both 1- and 2-word distinct lookups are in distinctocta_obj now
+        // Do this first, because it has the lowest offset
+        uint64 tmp_prior_hash = prior_octahash[next_prior_octahash];
+        if ((tmp_prior_hash != 0) && (tmp_prior_hash != wordhash40)) {
+          uint64 pair_hash = PairHash(tmp_prior_hash, wordhash40);
+          probs = OctaHashV3Lookup4(distinctocta_obj, pair_hash);
+          if (probs != 0) {
+            int indirect_subscr = probs & ~distinctocta_obj->kCLDTableKeyMask;
+            hitbuffer->distinct[next_distinct].offset = prior_word_start - text;
+            hitbuffer->distinct[next_distinct].indirect = indirect_subscr;
+            ++next_distinct;
+          }
+        }
+
+        // (2) Lookup this distinct word and save <offset, indirect>
+        probs = OctaHashV3Lookup4(distinctocta_obj, wordhash40);
+        if (probs != 0) {
+          int indirect_subscr = probs & ~distinctocta_obj->kCLDTableKeyMask;
+          hitbuffer->distinct[next_distinct].offset = word_start - text;
+          hitbuffer->distinct[next_distinct].indirect = indirect_subscr;
+          ++next_distinct;
+        }
+
+        // (3) Lookup this word and save <offset, indirect>
+        probs = OctaHashV3Lookup4(deltaocta_obj, wordhash40);
+        if (probs != 0) {
+          // Save indirect subscript for later scoring; 1 langprob
+          int indirect_subscr = probs & ~deltaocta_obj->kCLDTableKeyMask;
+          hitbuffer->delta[next_delta].offset = word_start - text;
+          hitbuffer->delta[next_delta].indirect = indirect_subscr;
+          ++next_delta;
+        }
+      }
+
+      // Begin the next word
+      charcount = 0;
+      prior_word_start = word_start;
+      word_start = src + 1;   // Over the space
+      word_end = word_start;
+    } else {
+      ++charcount;
+    }
+
+    // Advance to next char
+    src += UTF8OneCharLen(src);
+    if (charcount <= 8) {
+      word_end = src;
+    }
+    // Almost always srclimit hit first
+    if (next_delta >= next_delta_limit) {break;}
+    if (next_distinct >= next_distinct_limit) {break;}
+  }
+
+  hitbuffer->next_delta = next_delta;
+  hitbuffer->next_distinct = next_distinct;
+
+  // Make a dummy entry off the end to calc length of last span
+  int dummy_offset = src - text;
+  hitbuffer->delta[hitbuffer->next_delta].offset = dummy_offset;
+  hitbuffer->delta[hitbuffer->next_delta].indirect = 0;
+  hitbuffer->distinct[hitbuffer->next_distinct].offset = dummy_offset;
+  hitbuffer->distinct[hitbuffer->next_distinct].indirect = 0;
+}
+
+
+//----------------------------------------------------------------------------//
+// Reliability calculations, for single language and between languages        //
+//----------------------------------------------------------------------------//
+
+// Return reliablity of result 0..100 for top two scores
+// delta==0 is 0% reliable, delta==fully_reliable_thresh is 100% reliable
+// (on a scale where +1 is a factor of  2 ** 1.6 = 3.02)
+// Threshold is uni/quadgram increment count, bounded above and below.
+//
+// Requiring a factor of 3 improvement (e.g. +1 log base 3)
+// for each scored quadgram is too stringent, so I've backed this off to a
+// factor of 2 (e.g. +5/8 log base 3).
+//
+// I also somewhat lowered the Min/MaxGramCount limits above
+//
+// Added: if fewer than 8 quads/unis, max reliability is 12*n percent
+//
+int ReliabilityDelta(int value1, int value2, int gramcount) {
+  int max_reliability_percent = 100;
+  if (gramcount < 8) {
+    max_reliability_percent = 12 * gramcount;
+  }
+  int fully_reliable_thresh = (gramcount * 5) >> 3;     // see note above
+  if (fully_reliable_thresh < kMinGramCount) {          // Fully = 3..16
+    fully_reliable_thresh = kMinGramCount;
+  } else if (fully_reliable_thresh > kMaxGramCount) {
+    fully_reliable_thresh = kMaxGramCount;
+  }
+
+  int delta = value1 - value2;
+  if (delta >= fully_reliable_thresh) {return max_reliability_percent;}
+  if (delta <= 0) {return 0;}
+  return minint(max_reliability_percent,
+                     (100 * delta) / fully_reliable_thresh);
+}
+
+// Return reliablity of result 0..100 for top score vs. expected mainsteam score
+// Values are score per 1024 bytes of input
+// ratio = max(top/mainstream, mainstream/top)
+// ratio > 4.0 is 0% reliable, <= 2.0 is 100% reliable
+// Change: short-text word scoring can give unusually good results.
+//  Let top exceed mainstream by 4x at 50% reliable
+//
+// dsites April 2010: These could be tightened up. It would be
+// reasonable with newer data and round-robin table allocation to start ramping
+// down at mean * 1.5 and mean/1.5, while letting mean*2 and mean/2 pass,
+// but just barely.
+//
+// dsites March 2013: Tightened up a bit.
+static const double kRatio100 = 1.5;
+static const double kRatio0 = 4.0;
+int ReliabilityExpected(int actual_score_1kb, int expected_score_1kb) {
+  if (expected_score_1kb == 0) {return 100;}    // No reliability data available yet
+  if (actual_score_1kb == 0) {return 0;}        // zero score = unreliable
+  double ratio;
+  if (expected_score_1kb > actual_score_1kb) {
+    ratio = (1.0 * expected_score_1kb) / actual_score_1kb;
+  } else {
+    ratio = (1.0 * actual_score_1kb) / expected_score_1kb;
+  }
+  // Ratio 1.0 .. 1.5 scores 100%
+  // Ratio 2.0 scores 80%
+  // Linear decline, to ratio 4.0 scores 0%
+  if (ratio <= kRatio100) {return 100;}
+  if (ratio > kRatio0) {return 0;}
+
+  int percent_good = 100.0 * (kRatio0 - ratio) / (kRatio0 - kRatio100);
+  return percent_good;
+}
+
+// Create a langprob packed value from its parts.
+// qprob is quantized [0..12]
+// We use Latn script to represent any RTypeMany language
+uint32 MakeLangProb(Language lang, int qprob) {
+  uint32 pslang = PerScriptNumber(ULScript_Latin, lang);
+  uint32 retval = (pslang << 8) | kLgProbV2TblBackmap[qprob];
+  return retval;
+}
+
+}       // End namespace CLD2
+
+
+
+
+