Quelle shared_dictionary_internal.h Sprache: C

/* Copyright 2017 Google Inc. All Rights Reserved.

   Distributed under MIT license.
   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/

/* (Transparent) Shared Dictionary definition. */

#ifndef BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_
#define BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_

#include <brotli/shared_dictionary.h>
#include <brotli/types.h>

#include "dictionary.h"
#include "transform.h"

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

struct BrotliSharedDictionaryStruct {
  /* LZ77 prefixes (compound dictionary). */
  uint32_t num_prefix;  /* max SHARED_BROTLI_MAX_COMPOUND_DICTS */
  size_t prefix_size[SHARED_BROTLI_MAX_COMPOUND_DICTS];
  const uint8_t* prefix[SHARED_BROTLI_MAX_COMPOUND_DICTS];

  /* If set, the context map is used to select word and transform list from 64
     contexts, if not set, the context map is not used and only words[0] and
     transforms[0] are to be used. */
  BROTLI_BOOL context_based;

  uint8_t context_map[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];

  /* Amount of word_list+transform_list combinations. */
  uint8_t num_dictionaries;

  /* Must use num_dictionaries values. */
  const BrotliDictionary* words[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];

  /* Must use num_dictionaries values. */
  const BrotliTransforms* transforms[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];

  /* Amount of custom word lists. May be 0 if only Brotli's built-in is used */
  uint8_t num_word_lists;

  /* Contents of the custom words lists. Must be NULL if num_word_lists is 0. */
  BrotliDictionary* words_instances;

  /* Amount of custom transform lists. May be 0 if only Brotli's built-in is
     used */
  uint8_t num_transform_lists;

  /* Contents of the custom transform lists. Must be NULL if num_transform_lists
     is 0. */
  BrotliTransforms* transforms_instances;

  /* Concatenated prefix_suffix_maps of the custom transform lists. Must be NULL
     if num_transform_lists is 0. */
  uint16_t* prefix_suffix_maps;

  /* Memory management */
  brotli_alloc_func alloc_func;
  brotli_free_func free_func;
  void* memory_manager_opaque;
};

typedef struct BrotliSharedDictionaryStruct BrotliSharedDictionaryInternal;
#define BrotliSharedDictionary BrotliSharedDictionaryInternal

#if defined(__cplusplus) || defined(c_plusplus)
}  /* extern "C" */
#endif

#endif  /* BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_ */

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