1 files changed, 265 insertions, 0 deletions
diff --git a/browser/components/translation/cld2/internal/tote.cc b/browser/components/translation/cld2/internal/tote.cc
new file mode 100644
index 000000000..fbaba7d5c
--- /dev/null
+++ b/browser/components/translation/cld2/internal/tote.cc
@@ -0,0 +1,265 @@
+// 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)
+//
+
+#include "tote.h"
+#include "lang_script.h"    // For LanguageCode in Dump
+
+#include <stdio.h>
+#include <string.h>         // For memset
+
+namespace CLD2 {
+
+// Take a set of <key, value> pairs and tote them up.
+// After explicitly sorting, retrieve top key, value pairs
+// Normal use is key=per-script language and value = probability score
+Tote::Tote() {
+  in_use_mask_ = 0;
+  byte_count_ = 0;
+  score_count_ = 0;
+  // No need to initialize values
+}
+
+Tote::~Tote() {
+}
+
+void Tote::Reinit() {
+  in_use_mask_ = 0;
+  byte_count_ = 0;
+  score_count_ = 0;
+  // No need to initialize values
+}
+// Increment count of quadgrams/trigrams/unigrams scored
+void Tote::AddScoreCount() {
+  ++score_count_;
+}
+
+
+void Tote::Add(uint8 ikey, int idelta) {
+  int key_group = ikey >> 2;
+  uint64 groupmask = (1ULL << key_group);
+  if ((in_use_mask_ & groupmask) == 0) {
+    // Initialize this group
+    gscore_[key_group] = 0;
+    in_use_mask_ |= groupmask;
+  }
+  score_[ikey] += idelta;
+}
+
+
+// Return current top three keys
+void Tote::CurrentTopThreeKeys(int* key3) const {
+  key3[0] = -1;
+  key3[1] = -1;
+  key3[2] = -1;
+  int score3[3] = {-1, -1, -1};
+  uint64 tempmask = in_use_mask_;
+  int base = 0;
+  while (tempmask != 0) {
+    if (tempmask & 1) {
+      // Look at four in-use keys
+      for (int i = 0; i < 4; ++i) {
+        int insert_me = score_[base + i];
+        // Favor lower numbers on ties
+        if (insert_me > score3[2]) {
+          // Insert
+          int insert_at = 2;
+          if (insert_me > score3[1]) {
+            score3[2] = score3[1];
+            key3[2] = key3[1];
+            insert_at = 1;
+            if (insert_me > score3[0]) {
+              score3[1] = score3[0];
+              key3[1] = key3[0];
+              insert_at = 0;
+            }
+          }
+          score3[insert_at] = insert_me;
+          key3[insert_at] = base + i;
+        }
+      }
+    }
+    tempmask >>= 1;
+    base += 4;
+  }
+}
+
+
+// Take a set of <key, value> pairs and tote them up.
+// After explicitly sorting, retrieve top key, value pairs
+// 0xFFFF in key signifies unused
+DocTote::DocTote() {
+  // No need to initialize score_ or value_
+  incr_count_ = 0;
+  sorted_ = 0;
+  memset(closepair_, 0, sizeof(closepair_));
+  memset(key_, 0xFF, sizeof(key_));
+}
+
+DocTote::~DocTote() {
+}
+
+void DocTote::Reinit() {
+  // No need to initialize score_ or value_
+  incr_count_ = 0;
+  sorted_ = 0;
+  memset(closepair_, 0, sizeof(closepair_));
+  memset(key_, 0xFF, sizeof(key_));
+  runningscore_.Reinit();
+}
+
+// Weight reliability by ibytes
+// Also see three-way associative comments above for Tote
+void DocTote::Add(uint16 ikey, int ibytes,
+                              int score, int ireliability) {
+  ++incr_count_;
+
+  // Look for existing entry in top 2 positions of 3, times 8 columns
+  int sub0 = ikey & 15;
+  if (key_[sub0] == ikey) {
+    value_[sub0] += ibytes;
+    score_[sub0] += score;
+    reliability_[sub0] += ireliability * ibytes;
+    return;
+  }
+  // Look for existing entry in other of top 2 positions of 3, times 8 columns
+  int sub1 = sub0 ^ 8;
+  if (key_[sub1] == ikey) {
+    value_[sub1] += ibytes;
+    score_[sub1] += score;
+    reliability_[sub1] += ireliability * ibytes;
+    return;
+  }
+  // Look for existing entry in third position of 3, times 8 columns
+  int sub2 = (ikey & 7) + 16;
+  if (key_[sub2] == ikey) {
+    value_[sub2] += ibytes;
+    score_[sub2] += score;
+    reliability_[sub2] += ireliability * ibytes;
+    return;
+  }
+
+  // Allocate new entry
+  int alloc = -1;
+  if (key_[sub0] == kUnusedKey) {
+    alloc = sub0;
+  } else if (key_[sub1] == kUnusedKey) {
+    alloc = sub1;
+  } else if (key_[sub2] == kUnusedKey) {
+    alloc = sub2;
+  } else {
+    // All choices allocated, need to replace smallest one
+    alloc = sub0;
+    if (value_[sub1] < value_[alloc]) {alloc = sub1;}
+    if (value_[sub2] < value_[alloc]) {alloc = sub2;}
+  }
+  key_[alloc] = ikey;
+  value_[alloc] = ibytes;
+  score_[alloc] = score;
+  reliability_[alloc] = ireliability * ibytes;
+  return;
+}
+
+// Find subscript of a given packed language, or -1
+int DocTote::Find(uint16 ikey) {
+  if (sorted_) {
+    // Linear search if sorted
+    for (int sub = 0; sub < kMaxSize_; ++sub) {
+      if (key_[sub] == ikey) {return sub;}
+    }
+    return -1;
+  }
+
+  // Look for existing entry
+  int sub0 = ikey & 15;
+  if (key_[sub0] == ikey) {
+    return sub0;
+  }
+  int sub1 = sub0 ^ 8;
+  if (key_[sub1] == ikey) {
+    return sub1;
+  }
+  int sub2 = (ikey & 7) + 16;
+  if (key_[sub2] == ikey) {
+    return sub2;
+  }
+
+  return -1;
+}
+
+// Return current top key
+int DocTote::CurrentTopKey() {
+  int top_key = 0;
+  int top_value = -1;
+  for (int sub = 0; sub < kMaxSize_; ++sub) {
+    if (key_[sub] == kUnusedKey) {continue;}
+    if (top_value < value_[sub]) {
+      top_value = value_[sub];
+      top_key = key_[sub];
+    }
+  }
+  return top_key;
+}
+
+
+// Sort first n entries by decreasing order of value
+// If key==0 other fields are not valid, treat value as -1
+void DocTote::Sort(int n) {
+  // This is n**2, but n is small
+  for (int sub = 0; sub < n; ++sub) {
+    if (key_[sub] == kUnusedKey) {value_[sub] = -1;}
+
+    // Bubble sort key[sub] and entry[sub]
+    for (int sub2 = sub + 1; sub2 < kMaxSize_; ++sub2) {
+      if (key_[sub2] == kUnusedKey) {value_[sub2] = -1;}
+      if (value_[sub] < value_[sub2]) {
+        // swap
+        uint16 tmpk = key_[sub];
+        key_[sub] = key_[sub2];
+        key_[sub2] = tmpk;
+
+        int tmpv = value_[sub];
+        value_[sub] = value_[sub2];
+        value_[sub2] = tmpv;
+
+        double tmps = score_[sub];
+        score_[sub] = score_[sub2];
+        score_[sub2] = tmps;
+
+        int tmpr = reliability_[sub];
+        reliability_[sub] = reliability_[sub2];
+        reliability_[sub2] = tmpr;
+      }
+    }
+  }
+  sorted_ = 1;
+}
+
+void DocTote::Dump(FILE* f) {
+  fprintf(f, "DocTote::Dump\n");
+  for (int sub = 0; sub < kMaxSize_; ++sub) {
+    if (key_[sub] != kUnusedKey) {
+      Language lang = static_cast<Language>(key_[sub]);
+      fprintf(f, "[%2d] %3s %6dB %5dp %4dR,\n", sub, LanguageCode(lang),
+              value_[sub], score_[sub], reliability_[sub]);
+    }
+  }
+  fprintf(f, "  %d chunks scored<br>\n", incr_count_);
+}
+
+}       // End namespace CLD2
+