Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/encoder_dict.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /* Copyright 2017 Google Inc. All Rights Reserved.
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2
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3 Distributed under MIT license.
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4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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5 */
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7 #ifndef BROTLI_ENC_ENCODER_DICT_H_
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8 #define BROTLI_ENC_ENCODER_DICT_H_
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9
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10 #include <brotli/shared_dictionary.h>
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11 #include <brotli/types.h>
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13 #include "../common/dictionary.h"
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14 #include "../common/platform.h"
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15 #include "compound_dictionary.h"
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16 #include "memory.h"
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17 #include "static_dict_lut.h"
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19 #if defined(__cplusplus) || defined(c_plusplus)
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20 extern "C" {
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21 #endif
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23 /*
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24 Dictionary hierarchy for Encoder:
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25 -SharedEncoderDictionary
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26 --CompoundDictionary
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27 ---PreparedDictionary [up to 15x]
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28 = prefix dictionary with precomputed hashes
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29 --ContextualEncoderDictionary
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30 ---BrotliEncoderDictionary [up to 64x]
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31 = for each context, precomputed static dictionary with words + transforms
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33 Dictionary hiearchy from common: similar, but without precomputed hashes
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34 -BrotliSharedDictionary
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35 --BrotliDictionary [up to 64x]
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36 --BrotliTransforms [up to 64x]
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37 --const uint8_t* prefix [up to 15x]: compound dictionaries
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38 */
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40 typedef struct BrotliTrieNode {
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41 uint8_t single; /* if 1, sub is a single node for c instead of 256 */
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42 uint8_t c;
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43 uint8_t len_; /* untransformed length */
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44 uint32_t idx_; /* word index + num words * transform index */
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45 uint32_t sub; /* index of sub node(s) in the pool */
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46 } BrotliTrieNode;
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48 typedef struct BrotliTrie {
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49 BrotliTrieNode* pool;
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50 size_t pool_capacity;
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51 size_t pool_size;
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52 BrotliTrieNode root;
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53 } BrotliTrie;
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55 #if defined(BROTLI_EXPERIMENTAL)
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56 BROTLI_INTERNAL const BrotliTrieNode* BrotliTrieSub(const BrotliTrie* trie,
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57 const BrotliTrieNode* node, uint8_t c);
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58 #endif /* BROTLI_EXPERIMENTAL */
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60 /* Dictionary data (words and transforms) for 1 possible context */
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61 typedef struct BrotliEncoderDictionary {
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62 const BrotliDictionary* words;
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63 uint32_t num_transforms;
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65 /* cut off for fast encoder */
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66 uint32_t cutoffTransformsCount;
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67 uint64_t cutoffTransforms;
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69 /* from dictionary_hash.h, for fast encoder */
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70 const uint16_t* hash_table_words;
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71 const uint8_t* hash_table_lengths;
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73 /* from static_dict_lut.h, for slow encoder */
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74 const uint16_t* buckets;
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75 const DictWord* dict_words;
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76 /* Heavy version, for use by slow encoder when there are custom transforms.
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77 Contains every possible transformed dictionary word in a trie. It encodes
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78 about as fast as the non-heavy encoder but consumes a lot of memory and
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79 takes time to build. */
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80 BrotliTrie trie;
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81 BROTLI_BOOL has_words_heavy;
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82
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83 /* Reference to other dictionaries. */
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84 const struct ContextualEncoderDictionary* parent;
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86 /* Allocated memory, used only when not using the Brotli defaults */
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87 uint16_t* hash_table_data_words_;
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88 uint8_t* hash_table_data_lengths_;
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89 size_t buckets_alloc_size_;
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90 uint16_t* buckets_data_;
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91 size_t dict_words_alloc_size_;
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92 DictWord* dict_words_data_;
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93 BrotliDictionary* words_instance_;
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94 } BrotliEncoderDictionary;
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96 /* Dictionary data for all 64 contexts */
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97 typedef struct ContextualEncoderDictionary {
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98 BROTLI_BOOL context_based;
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99 uint8_t num_dictionaries;
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100 uint8_t context_map[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];
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101 const BrotliEncoderDictionary* dict[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];
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102
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103 /* If num_instances_ is 1, instance_ is used, else dynamic allocation with
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104 instances_ is used. */
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105 size_t num_instances_;
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106 BrotliEncoderDictionary instance_;
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107 BrotliEncoderDictionary* instances_;
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108 } ContextualEncoderDictionary;
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109
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110 typedef struct SharedEncoderDictionary {
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111 /* Magic value to distinguish this struct from PreparedDictionary for
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112 certain external usages. */
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113 uint32_t magic;
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114
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115 /* LZ77 prefix, compound dictionary */
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116 CompoundDictionary compound;
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117
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118 /* Custom static dictionary (optionally context-based) */
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119 ContextualEncoderDictionary contextual;
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120
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121 /* The maximum quality the dictionary was computed for */
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122 int max_quality;
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123 } SharedEncoderDictionary;
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124
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125 typedef struct ManagedDictionary {
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126 uint32_t magic;
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127 MemoryManager memory_manager_;
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128 uint32_t* dictionary;
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129 } ManagedDictionary;
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130
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131 /* Initializes to the brotli built-in dictionary */
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132 BROTLI_INTERNAL void BrotliInitSharedEncoderDictionary(
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133 SharedEncoderDictionary* dict);
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134
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135 #if defined(BROTLI_EXPERIMENTAL)
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136 /* Initializes to shared dictionary that will be parsed from
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137 encoded_dict. Requires that you keep the encoded_dict buffer
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138 around, parts of data will point to it. */
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139 BROTLI_INTERNAL BROTLI_BOOL BrotliInitCustomSharedEncoderDictionary(
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140 MemoryManager* m, const uint8_t* encoded_dict, size_t size,
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141 int quality, SharedEncoderDictionary* dict);
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142 #endif /* BROTLI_EXPERIMENTAL */
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143
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144 BROTLI_INTERNAL void BrotliCleanupSharedEncoderDictionary(
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145 MemoryManager* m, SharedEncoderDictionary* dict);
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146
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147 BROTLI_INTERNAL ManagedDictionary* BrotliCreateManagedDictionary(
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148 brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque);
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149
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150 BROTLI_INTERNAL void BrotliDestroyManagedDictionary(
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151 ManagedDictionary* dictionary);
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152
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153 #if defined(__cplusplus) || defined(c_plusplus)
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154 } /* extern "C" */
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155 #endif
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156
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157 #endif /* BROTLI_ENC_ENCODER_DICT_H_ */