From 783c57b2d3312738ddcf992ac55ff750afe7cb47 Mon Sep 17 00:00:00 2001
From: Kenneth Heafield <github@kheafield.com>
Date: Mon, 27 Jan 2014 17:42:19 -0800
Subject: KenLM 5cc905bc2d214efa7de2db56a9a672b749a95591

---
 klm/lm/vocab.cc | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

(limited to 'klm/lm/vocab.cc')

diff --git a/klm/lm/vocab.cc b/klm/lm/vocab.cc
index fd7f96dc..7f0878f4 100644
--- a/klm/lm/vocab.cc
+++ b/klm/lm/vocab.cc
@@ -32,7 +32,8 @@ const uint64_t kUnknownHash = detail::HashForVocab("<unk>", 5);
 // Sadly some LMs have <UNK>.  
 const uint64_t kUnknownCapHash = detail::HashForVocab("<UNK>", 5);
 
-void ReadWords(int fd, EnumerateVocab *enumerate, WordIndex expected_count) {
+void ReadWords(int fd, EnumerateVocab *enumerate, WordIndex expected_count, uint64_t offset) {
+  util::SeekOrThrow(fd, offset);
   // Check that we're at the right place by reading <unk> which is always first.
   char check_unk[6];
   util::ReadOrThrow(fd, check_unk, 6);
@@ -80,11 +81,6 @@ void WriteWordsWrapper::Add(WordIndex index, const StringPiece &str) {
   buffer_.push_back(0);
 }
 
-void WriteWordsWrapper::Write(int fd, uint64_t start) {
-  util::SeekOrThrow(fd, start);
-  util::WriteOrThrow(fd, buffer_.data(), buffer_.size());
-}
-
 SortedVocabulary::SortedVocabulary() : begin_(NULL), end_(NULL), enumerate_(NULL) {}
 
 uint64_t SortedVocabulary::Size(uint64_t entries, const Config &/*config*/) {
@@ -100,6 +96,12 @@ void SortedVocabulary::SetupMemory(void *start, std::size_t allocated, std::size
   saw_unk_ = false;
 }
 
+void SortedVocabulary::Relocate(void *new_start) {
+  std::size_t delta = end_ - begin_;
+  begin_ = reinterpret_cast<uint64_t*>(new_start) + 1;
+  end_ = begin_ + delta;
+}
+
 void SortedVocabulary::ConfigureEnumerate(EnumerateVocab *to, std::size_t max_entries) {
   enumerate_ = to;
   if (enumerate_) {
@@ -147,11 +149,11 @@ void SortedVocabulary::FinishedLoading(ProbBackoff *reorder_vocab) {
   bound_ = end_ - begin_ + 1;
 }
 
-void SortedVocabulary::LoadedBinary(bool have_words, int fd, EnumerateVocab *to) {
+void SortedVocabulary::LoadedBinary(bool have_words, int fd, EnumerateVocab *to, uint64_t offset) {
   end_ = begin_ + *(reinterpret_cast<const uint64_t*>(begin_) - 1);
   SetSpecial(Index("<s>"), Index("</s>"), 0);
   bound_ = end_ - begin_ + 1;
-  if (have_words) ReadWords(fd, to, bound_);
+  if (have_words) ReadWords(fd, to, bound_, offset);
 }
 
 namespace {
@@ -179,6 +181,11 @@ void ProbingVocabulary::SetupMemory(void *start, std::size_t allocated, std::siz
   saw_unk_ = false;
 }
 
+void ProbingVocabulary::Relocate(void *new_start) {
+  header_ = static_cast<detail::ProbingVocabularyHeader*>(new_start);
+  lookup_.Relocate(static_cast<uint8_t*>(new_start) + ALIGN8(sizeof(detail::ProbingVocabularyHeader)));
+}
+
 void ProbingVocabulary::ConfigureEnumerate(EnumerateVocab *to, std::size_t /*max_entries*/) {
   enumerate_ = to;
   if (enumerate_) {
@@ -206,12 +213,11 @@ void ProbingVocabulary::InternalFinishedLoading() {
   SetSpecial(Index("<s>"), Index("</s>"), 0);
 }
 
-void ProbingVocabulary::LoadedBinary(bool have_words, int fd, EnumerateVocab *to) {
+void ProbingVocabulary::LoadedBinary(bool have_words, int fd, EnumerateVocab *to, uint64_t offset) {
   UTIL_THROW_IF(header_->version != kProbingVocabularyVersion, FormatLoadException, "The binary file has probing version " << header_->version << " but the code expects version " << kProbingVocabularyVersion << ".  Please rerun build_binary using the same version of the code.");
-  lookup_.LoadedBinary();
   bound_ = header_->bound;
   SetSpecial(Index("<s>"), Index("</s>"), 0);
-  if (have_words) ReadWords(fd, to, bound_);
+  if (have_words) ReadWords(fd, to, bound_, offset);
 }
 
 void MissingUnknown(const Config &config) throw(SpecialWordMissingException) {
-- 
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