Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/command.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 /* Copyright 2013 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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6
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7 /* This class models a sequence of literals and a backward reference copy. */
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8
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9 #ifndef BROTLI_ENC_COMMAND_H_
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10 #define BROTLI_ENC_COMMAND_H_
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11
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12 #include <brotli/types.h>
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14 #include "../common/constants.h"
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15 #include "../common/platform.h"
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16 #include "fast_log.h"
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17 #include "params.h"
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18 #include "prefix.h"
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20 #if defined(__cplusplus) || defined(c_plusplus)
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21 extern "C" {
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22 #endif
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24 BROTLI_INTERNAL extern const uint32_t
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25 kBrotliInsBase[BROTLI_NUM_INS_COPY_CODES];
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26 BROTLI_INTERNAL extern const uint32_t
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27 kBrotliInsExtra[BROTLI_NUM_INS_COPY_CODES];
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28 BROTLI_INTERNAL extern const uint32_t
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29 kBrotliCopyBase[BROTLI_NUM_INS_COPY_CODES];
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30 BROTLI_INTERNAL extern const uint32_t
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31 kBrotliCopyExtra[BROTLI_NUM_INS_COPY_CODES];
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32
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33 static BROTLI_INLINE uint16_t GetInsertLengthCode(size_t insertlen) {
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34 if (insertlen < 6) {
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35 return (uint16_t)insertlen;
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36 } else if (insertlen < 130) {
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37 uint32_t nbits = Log2FloorNonZero(insertlen - 2) - 1u;
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38 return (uint16_t)((nbits << 1) + ((insertlen - 2) >> nbits) + 2);
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39 } else if (insertlen < 2114) {
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40 return (uint16_t)(Log2FloorNonZero(insertlen - 66) + 10);
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41 } else if (insertlen < 6210) {
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42 return 21u;
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43 } else if (insertlen < 22594) {
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44 return 22u;
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45 } else {
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46 return 23u;
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47 }
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48 }
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49
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50 static BROTLI_INLINE uint16_t GetCopyLengthCode(size_t copylen) {
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51 if (copylen < 10) {
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52 return (uint16_t)(copylen - 2);
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53 } else if (copylen < 134) {
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54 uint32_t nbits = Log2FloorNonZero(copylen - 6) - 1u;
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55 return (uint16_t)((nbits << 1) + ((copylen - 6) >> nbits) + 4);
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56 } else if (copylen < 2118) {
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57 return (uint16_t)(Log2FloorNonZero(copylen - 70) + 12);
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58 } else {
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59 return 23u;
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60 }
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61 }
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62
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63 static BROTLI_INLINE uint16_t CombineLengthCodes(
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64 uint16_t inscode, uint16_t copycode, BROTLI_BOOL use_last_distance) {
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65 uint16_t bits64 =
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66 (uint16_t)((copycode & 0x7u) | ((inscode & 0x7u) << 3u));
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67 if (use_last_distance && inscode < 8u && copycode < 16u) {
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68 return (copycode < 8u) ? bits64 : (bits64 | 64u);
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69 } else {
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70 /* Specification: 5 Encoding of ... (last table) */
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71 /* offset = 2 * index, where index is in range [0..8] */
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72 uint32_t offset = 2u * ((copycode >> 3u) + 3u * (inscode >> 3u));
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73 /* All values in specification are K * 64,
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74 where K = [2, 3, 6, 4, 5, 8, 7, 9, 10],
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75 i + 1 = [1, 2, 3, 4, 5, 6, 7, 8, 9],
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76 K - i - 1 = [1, 1, 3, 0, 0, 2, 0, 1, 2] = D.
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77 All values in D require only 2 bits to encode.
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78 Magic constant is shifted 6 bits left, to avoid final multiplication. */
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79 offset = (offset << 5u) + 0x40u + ((0x520D40u >> offset) & 0xC0u);
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80 return (uint16_t)(offset | bits64);
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81 }
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82 }
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83
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84 static BROTLI_INLINE void GetLengthCode(size_t insertlen, size_t copylen,
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85 BROTLI_BOOL use_last_distance,
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86 uint16_t* code) {
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87 uint16_t inscode = GetInsertLengthCode(insertlen);
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88 uint16_t copycode = GetCopyLengthCode(copylen);
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89 *code = CombineLengthCodes(inscode, copycode, use_last_distance);
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90 }
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91
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92 static BROTLI_INLINE uint32_t GetInsertBase(uint16_t inscode) {
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93 return kBrotliInsBase[inscode];
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94 }
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95
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96 static BROTLI_INLINE uint32_t GetInsertExtra(uint16_t inscode) {
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97 return kBrotliInsExtra[inscode];
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98 }
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99
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100 static BROTLI_INLINE uint32_t GetCopyBase(uint16_t copycode) {
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101 return kBrotliCopyBase[copycode];
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102 }
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103
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104 static BROTLI_INLINE uint32_t GetCopyExtra(uint16_t copycode) {
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105 return kBrotliCopyExtra[copycode];
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106 }
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107
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108 typedef struct Command {
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109 uint32_t insert_len_;
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110 /* Stores copy_len in low 25 bits and copy_code - copy_len in high 7 bit. */
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111 uint32_t copy_len_;
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112 /* Stores distance extra bits. */
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113 uint32_t dist_extra_;
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114 uint16_t cmd_prefix_;
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115 /* Stores distance code in low 10 bits
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116 and number of extra bits in high 6 bits. */
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117 uint16_t dist_prefix_;
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118 } Command;
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119
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120 /* distance_code is e.g. 0 for same-as-last short code, or 16 for offset 1. */
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121 static BROTLI_INLINE void InitCommand(Command* self,
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122 const BrotliDistanceParams* dist, size_t insertlen,
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123 size_t copylen, int copylen_code_delta, size_t distance_code) {
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124 /* Don't rely on signed int representation, use honest casts. */
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125 uint32_t delta = (uint8_t)((int8_t)copylen_code_delta);
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126 self->insert_len_ = (uint32_t)insertlen;
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127 self->copy_len_ = (uint32_t)(copylen | (delta << 25));
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128 /* The distance prefix and extra bits are stored in this Command as if
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129 npostfix and ndirect were 0, they are only recomputed later after the
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130 clustering if needed. */
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131 PrefixEncodeCopyDistance(
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132 distance_code, dist->num_direct_distance_codes,
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133 dist->distance_postfix_bits, &self->dist_prefix_, &self->dist_extra_);
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134 GetLengthCode(
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135 insertlen, (size_t)((int)copylen + copylen_code_delta),
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136 TO_BROTLI_BOOL((self->dist_prefix_ & 0x3FF) == 0), &self->cmd_prefix_);
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137 }
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138
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139 static BROTLI_INLINE void InitInsertCommand(Command* self, size_t insertlen) {
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140 self->insert_len_ = (uint32_t)insertlen;
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141 self->copy_len_ = 4 << 25;
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142 self->dist_extra_ = 0;
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143 self->dist_prefix_ = BROTLI_NUM_DISTANCE_SHORT_CODES;
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144 GetLengthCode(insertlen, 4, BROTLI_FALSE, &self->cmd_prefix_);
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145 }
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146
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147 static BROTLI_INLINE uint32_t CommandRestoreDistanceCode(
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148 const Command* self, const BrotliDistanceParams* dist) {
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149 if ((self->dist_prefix_ & 0x3FFu) <
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150 BROTLI_NUM_DISTANCE_SHORT_CODES + dist->num_direct_distance_codes) {
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151 return self->dist_prefix_ & 0x3FFu;
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152 } else {
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153 uint32_t dcode = self->dist_prefix_ & 0x3FFu;
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154 uint32_t nbits = self->dist_prefix_ >> 10;
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155 uint32_t extra = self->dist_extra_;
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156 uint32_t postfix_mask = (1U << dist->distance_postfix_bits) - 1U;
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157 uint32_t hcode = (dcode - dist->num_direct_distance_codes -
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158 BROTLI_NUM_DISTANCE_SHORT_CODES) >>
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159 dist->distance_postfix_bits;
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160 uint32_t lcode = (dcode - dist->num_direct_distance_codes -
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161 BROTLI_NUM_DISTANCE_SHORT_CODES) & postfix_mask;
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162 uint32_t offset = ((2U + (hcode & 1U)) << nbits) - 4U;
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163 return ((offset + extra) << dist->distance_postfix_bits) + lcode +
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164 dist->num_direct_distance_codes + BROTLI_NUM_DISTANCE_SHORT_CODES;
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165 }
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166 }
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167
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168 static BROTLI_INLINE uint32_t CommandDistanceContext(const Command* self) {
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169 uint32_t r = self->cmd_prefix_ >> 6;
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170 uint32_t c = self->cmd_prefix_ & 7;
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171 if ((r == 0 || r == 2 || r == 4 || r == 7) && (c <= 2)) {
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172 return c;
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173 }
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174 return 3;
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175 }
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176
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177 static BROTLI_INLINE uint32_t CommandCopyLen(const Command* self) {
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178 return self->copy_len_ & 0x1FFFFFF;
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179 }
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180
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181 static BROTLI_INLINE uint32_t CommandCopyLenCode(const Command* self) {
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182 uint32_t modifier = self->copy_len_ >> 25;
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183 int32_t delta = (int8_t)((uint8_t)(modifier | ((modifier & 0x40) << 1)));
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184 return (uint32_t)((int32_t)(self->copy_len_ & 0x1FFFFFF) + delta);
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185 }
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186
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diff changeset
187 #if defined(__cplusplus) || defined(c_plusplus)
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188 } /* extern "C" */
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189 #endif
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190
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diff changeset
191 #endif /* BROTLI_ENC_COMMAND_H_ */