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107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
#ifndef LM_BINARY_FORMAT_H
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#define LM_BINARY_FORMAT_H
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#include "lm/config.hh"
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#include "lm/model_type.hh"
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#include "lm/read_arpa.hh"
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#include "util/file_piece.hh"
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#include "util/mmap.hh"
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#include "util/scoped.hh"
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#include <cstddef>
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#include <vector>
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#include <stdint.h>
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namespace lm {
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namespace ngram {
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extern const char *kModelNames[6];
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/*Inspect a file to determine if it is a binary lm. If not, return false.
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* If so, return true and set recognized to the type. This is the only API in
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* this header designed for use by decoder authors.
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*/
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bool RecognizeBinary(const char *file, ModelType &recognized);
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struct FixedWidthParameters {
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unsigned char order;
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float probing_multiplier;
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// What type of model is this?
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ModelType model_type;
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// Does the end of the file have the actual strings in the vocabulary?
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bool has_vocabulary;
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unsigned int search_version;
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};
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// This is a macro instead of an inline function so constants can be assigned using it.
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#define ALIGN8(a) ((std::ptrdiff_t(((a)-1)/8)+1)*8)
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// Parameters stored in the header of a binary file.
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struct Parameters {
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FixedWidthParameters fixed;
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std::vector<uint64_t> counts;
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};
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class BinaryFormat {
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public:
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explicit BinaryFormat(const Config &config);
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// Reading a binary file:
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// Takes ownership of fd
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void InitializeBinary(int fd, ModelType model_type, unsigned int search_version, Parameters ¶ms);
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// Used to read parts of the file to update the config object before figuring out full size.
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void ReadForConfig(void *to, std::size_t amount, uint64_t offset_excluding_header) const;
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// Actually load the binary file and return a pointer to the beginning of the search area.
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void *LoadBinary(std::size_t size);
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uint64_t VocabStringReadingOffset() const {
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assert(vocab_string_offset_ != kInvalidOffset);
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return vocab_string_offset_;
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}
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// Writing a binary file or initializing in RAM from ARPA:
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// Size for vocabulary.
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void *SetupJustVocab(std::size_t memory_size, uint8_t order);
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// Warning: can change the vocaulary base pointer.
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void *GrowForSearch(std::size_t memory_size, std::size_t vocab_pad, void *&vocab_base);
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// Warning: can change vocabulary and search base addresses.
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void WriteVocabWords(const std::string &buffer, void *&vocab_base, void *&search_base);
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// Write the header at the beginning of the file.
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void FinishFile(const Config &config, ModelType model_type, unsigned int search_version, const std::vector<uint64_t> &counts);
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private:
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void MapFile(void *&vocab_base, void *&search_base);
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// Copied from configuration.
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const Config::WriteMethod write_method_;
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const char *write_mmap_;
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util::LoadMethod load_method_;
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// File behind memory, if any.
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util::scoped_fd file_;
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// If there is a file involved, a single mapping.
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util::scoped_memory mapping_;
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// If the data is only in memory, separately allocate each because the trie
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// knows vocab's size before it knows search's size (because SRILM might
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// have pruned).
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util::scoped_memory memory_vocab_, memory_search_;
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// Memory ranges. Note that these may not be contiguous and may not all
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// exist.
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std::size_t header_size_, vocab_size_, vocab_pad_;
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// aka end of search.
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uint64_t vocab_string_offset_;
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static const uint64_t kInvalidOffset = (uint64_t)-1;
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};
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bool IsBinaryFormat(int fd);
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} // namespace ngram
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} // namespace lm
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#endif // LM_BINARY_FORMAT_H
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