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annotate mupdf-source/thirdparty/brotli/c/dec/huffman.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 2013 Google Inc. All Rights Reserved.
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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 /* Utilities for building Huffman decoding tables. */
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9 #ifndef BROTLI_DEC_HUFFMAN_H_
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10 #define BROTLI_DEC_HUFFMAN_H_
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12 #include <brotli/types.h>
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14 #include "../common/platform.h"
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16 #if defined(__cplusplus) || defined(c_plusplus)
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17 extern "C" {
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18 #endif
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20 #define BROTLI_HUFFMAN_MAX_CODE_LENGTH 15
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22 /* BROTLI_NUM_BLOCK_LEN_SYMBOLS == 26 */
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23 #define BROTLI_HUFFMAN_MAX_SIZE_26 396
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24 /* BROTLI_MAX_BLOCK_TYPE_SYMBOLS == 258 */
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25 #define BROTLI_HUFFMAN_MAX_SIZE_258 632
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26 /* BROTLI_MAX_CONTEXT_MAP_SYMBOLS == 272 */
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27 #define BROTLI_HUFFMAN_MAX_SIZE_272 646
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29 #define BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH 5
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31 #if ((defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_32)) && \
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32 BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0))
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33 #define BROTLI_HUFFMAN_CODE_FAST_LOAD
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34 #endif
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36 #if !defined(BROTLI_HUFFMAN_CODE_FAST_LOAD)
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37 /* Do not create this struct directly - use the ConstructHuffmanCode
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38 * constructor below! */
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39 typedef struct {
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40 uint8_t bits; /* number of bits used for this symbol */
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41 uint16_t value; /* symbol value or table offset */
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42 } HuffmanCode;
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44 static BROTLI_INLINE HuffmanCode ConstructHuffmanCode(const uint8_t bits,
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45 const uint16_t value) {
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46 HuffmanCode h;
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47 h.bits = bits;
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48 h.value = value;
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49 return h;
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50 }
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52 /* Please use the following macros to optimize HuffmanCode accesses in hot
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53 * paths.
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54 *
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55 * For example, assuming |table| contains a HuffmanCode pointer:
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56 *
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57 * BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(table);
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58 * BROTLI_HC_ADJUST_TABLE_INDEX(table, index_into_table);
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59 * *bits = BROTLI_HC_GET_BITS(table);
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60 * *value = BROTLI_HC_GET_VALUE(table);
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61 * BROTLI_HC_ADJUST_TABLE_INDEX(table, offset);
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62 * *bits2 = BROTLI_HC_GET_BITS(table);
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63 * *value2 = BROTLI_HC_GET_VALUE(table);
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64 *
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65 */
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67 #define BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(H)
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68 #define BROTLI_HC_ADJUST_TABLE_INDEX(H, V) H += (V)
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70 /* These must be given a HuffmanCode pointer! */
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71 #define BROTLI_HC_FAST_LOAD_BITS(H) (H->bits)
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72 #define BROTLI_HC_FAST_LOAD_VALUE(H) (H->value)
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74 #else /* BROTLI_HUFFMAN_CODE_FAST_LOAD */
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76 typedef BROTLI_ALIGNED(4) uint32_t HuffmanCode;
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78 static BROTLI_INLINE HuffmanCode ConstructHuffmanCode(const uint8_t bits,
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79 const uint16_t value) {
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80 return (HuffmanCode) ((value & 0xFFFF) << 16) | (bits & 0xFF);
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81 }
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83 #define BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(H) uint32_t __fastload_##H = (*H)
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84 #define BROTLI_HC_ADJUST_TABLE_INDEX(H, V) H += (V); __fastload_##H = (*H)
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86 /* These must be given a HuffmanCode pointer! */
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87 #define BROTLI_HC_FAST_LOAD_BITS(H) ((__fastload_##H) & 0xFF)
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88 #define BROTLI_HC_FAST_LOAD_VALUE(H) ((__fastload_##H) >> 16)
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89 #endif /* BROTLI_HUFFMAN_CODE_FAST_LOAD */
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91 /* Builds Huffman lookup table assuming code lengths are in symbol order. */
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92 BROTLI_INTERNAL void BrotliBuildCodeLengthsHuffmanTable(HuffmanCode* root_table,
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93 const uint8_t* const code_lengths, uint16_t* count);
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95 /* Builds Huffman lookup table assuming code lengths are in symbol order.
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96 Returns size of resulting table. */
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97 BROTLI_INTERNAL uint32_t BrotliBuildHuffmanTable(HuffmanCode* root_table,
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98 int root_bits, const uint16_t* const symbol_lists, uint16_t* count);
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99
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100 /* Builds a simple Huffman table. The |num_symbols| parameter is to be
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101 interpreted as follows: 0 means 1 symbol, 1 means 2 symbols,
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102 2 means 3 symbols, 3 means 4 symbols with lengths [2, 2, 2, 2],
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103 4 means 4 symbols with lengths [1, 2, 3, 3]. */
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104 BROTLI_INTERNAL uint32_t BrotliBuildSimpleHuffmanTable(HuffmanCode* table,
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105 int root_bits, uint16_t* symbols, uint32_t num_symbols);
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106
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107 /* Contains a collection of Huffman trees with the same alphabet size. */
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108 /* alphabet_size_limit is needed due to simple codes, since
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109 log2(alphabet_size_max) could be greater than log2(alphabet_size_limit). */
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110 typedef struct {
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111 HuffmanCode** htrees;
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112 HuffmanCode* codes;
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113 uint16_t alphabet_size_max;
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114 uint16_t alphabet_size_limit;
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115 uint16_t num_htrees;
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116 } HuffmanTreeGroup;
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117
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118 #if defined(__cplusplus) || defined(c_plusplus)
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119 } /* extern "C" */
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120 #endif
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121
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122 #endif /* BROTLI_DEC_HUFFMAN_H_ */