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annotate contrib/python-zstandard/c-ext/python-zstandard.h @ 45625:c11099cc1de4

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log: map --removed to walkopts.force_changelog_traversal This is the flag to forcibly enable the slowpath. I'm not sure if the slowpath parameter should be merged with this flag, so let's keep it as an immutable flag for now. I'll add another flag to support "grep --all-files". These two will be the flags which aren't directly mapped from the command-line options.
author Yuya Nishihara <yuya@tcha.org>
date Sat, 12 Sep 2020 21:54:58 +0900
parents de7838053207
children e92ca942ddca
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1 /**
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2 * Copyright (c) 2016-present, Gregory Szorc
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3 * All rights reserved.
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4 *
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5 * This software may be modified and distributed under the terms
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6 * of the BSD license. See the LICENSE file for details.
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7 */
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8
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9 #define PY_SSIZE_T_CLEAN
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10 #include <Python.h>
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11 #include "structmember.h"
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12
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13 #define ZSTD_STATIC_LINKING_ONLY
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14 #define ZDICT_STATIC_LINKING_ONLY
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15 #include <zstd.h>
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16 #include <zdict.h>
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17
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18 /* Remember to change the string in zstandard/__init__ as well */
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19 #define PYTHON_ZSTANDARD_VERSION "0.13.0"
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20
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21 typedef enum {
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22 compressorobj_flush_finish,
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23 compressorobj_flush_block,
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24 } CompressorObj_Flush;
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26 /*
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27 Represents a ZstdCompressionParameters type.
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28
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29 This type holds all the low-level compression parameters that can be set.
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30 */
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31 typedef struct {
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32 PyObject_HEAD
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33 ZSTD_CCtx_params* params;
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34 } ZstdCompressionParametersObject;
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36 extern PyTypeObject ZstdCompressionParametersType;
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37
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38 /*
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39 Represents a FrameParameters type.
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40
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41 This type is basically a wrapper around ZSTD_frameParams.
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42 */
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43 typedef struct {
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44 PyObject_HEAD
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45 unsigned long long frameContentSize;
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46 unsigned long long windowSize;
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47 unsigned dictID;
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48 char checksumFlag;
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49 } FrameParametersObject;
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50
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51 extern PyTypeObject FrameParametersType;
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52
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53 /*
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54 Represents a ZstdCompressionDict type.
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55
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56 Instances hold data used for a zstd compression dictionary.
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57 */
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58 typedef struct {
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59 PyObject_HEAD
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60
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61 /* Pointer to dictionary data. Owned by self. */
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62 void* dictData;
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63 /* Size of dictionary data. */
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64 size_t dictSize;
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65 ZSTD_dictContentType_e dictType;
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66 /* k parameter for cover dictionaries. Only populated by train_cover_dict(). */
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67 unsigned k;
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68 /* d parameter for cover dictionaries. Only populated by train_cover_dict(). */
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69 unsigned d;
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70 /* Digested dictionary, suitable for reuse. */
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71 ZSTD_CDict* cdict;
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72 ZSTD_DDict* ddict;
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73 } ZstdCompressionDict;
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74
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75 extern PyTypeObject ZstdCompressionDictType;
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76
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77 /*
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78 Represents a ZstdCompressor type.
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79 */
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80 typedef struct {
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81 PyObject_HEAD
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82
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83 /* Number of threads to use for operations. */
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84 unsigned int threads;
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85 /* Pointer to compression dictionary to use. NULL if not using dictionary
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86 compression. */
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87 ZstdCompressionDict* dict;
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88 /* Compression context to use. Populated during object construction. */
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89 ZSTD_CCtx* cctx;
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90 /* Compression parameters in use. */
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91 ZSTD_CCtx_params* params;
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92 } ZstdCompressor;
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93
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94 extern PyTypeObject ZstdCompressorType;
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95
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96 typedef struct {
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97 PyObject_HEAD
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98
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99 ZstdCompressor* compressor;
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100 ZSTD_outBuffer output;
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101 int finished;
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102 } ZstdCompressionObj;
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103
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104 extern PyTypeObject ZstdCompressionObjType;
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105
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106 typedef struct {
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107 PyObject_HEAD
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108
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109 ZstdCompressor* compressor;
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110 PyObject* writer;
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111 ZSTD_outBuffer output;
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112 size_t outSize;
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113 int entered;
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114 int closed;
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115 int writeReturnRead;
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116 unsigned long long bytesCompressed;
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117 } ZstdCompressionWriter;
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118
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119 extern PyTypeObject ZstdCompressionWriterType;
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120
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121 typedef struct {
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122 PyObject_HEAD
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123
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124 ZstdCompressor* compressor;
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125 PyObject* reader;
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126 Py_buffer buffer;
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127 Py_ssize_t bufferOffset;
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128 size_t inSize;
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129 size_t outSize;
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130
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131 ZSTD_inBuffer input;
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132 ZSTD_outBuffer output;
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133 int finishedOutput;
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134 int finishedInput;
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135 PyObject* readResult;
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136 } ZstdCompressorIterator;
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137
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138 extern PyTypeObject ZstdCompressorIteratorType;
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139
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140 typedef struct {
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141 PyObject_HEAD
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142
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143 ZstdCompressor* compressor;
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144 PyObject* reader;
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145 Py_buffer buffer;
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146 size_t readSize;
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147
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148 int entered;
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149 int closed;
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150 unsigned long long bytesCompressed;
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151
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152 ZSTD_inBuffer input;
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153 ZSTD_outBuffer output;
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154 int finishedInput;
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155 int finishedOutput;
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156 PyObject* readResult;
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157 } ZstdCompressionReader;
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158
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159 extern PyTypeObject ZstdCompressionReaderType;
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160
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161 typedef struct {
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162 PyObject_HEAD
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163
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164 ZstdCompressor* compressor;
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165 ZSTD_inBuffer input;
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166 ZSTD_outBuffer output;
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167 Py_buffer inBuffer;
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168 int finished;
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169 size_t chunkSize;
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170 } ZstdCompressionChunker;
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171
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172 extern PyTypeObject ZstdCompressionChunkerType;
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173
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174 typedef enum {
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175 compressionchunker_mode_normal,
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176 compressionchunker_mode_flush,
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177 compressionchunker_mode_finish,
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178 } CompressionChunkerMode;
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179
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180 typedef struct {
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181 PyObject_HEAD
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182
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183 ZstdCompressionChunker* chunker;
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184 CompressionChunkerMode mode;
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185 } ZstdCompressionChunkerIterator;
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186
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187 extern PyTypeObject ZstdCompressionChunkerIteratorType;
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188
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189 typedef struct {
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190 PyObject_HEAD
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191
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192 ZSTD_DCtx* dctx;
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193 ZstdCompressionDict* dict;
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194 size_t maxWindowSize;
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195 ZSTD_format_e format;
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196 } ZstdDecompressor;
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197
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198 extern PyTypeObject ZstdDecompressorType;
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199
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200 typedef struct {
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201 PyObject_HEAD
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202
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203 ZstdDecompressor* decompressor;
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204 size_t outSize;
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205 int finished;
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206 } ZstdDecompressionObj;
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207
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208 extern PyTypeObject ZstdDecompressionObjType;
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209
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210 typedef struct {
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211 PyObject_HEAD
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212
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213 /* Parent decompressor to which this object is associated. */
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214 ZstdDecompressor* decompressor;
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215 /* Object to read() from (if reading from a stream). */
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216 PyObject* reader;
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217 /* Size for read() operations on reader. */
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218 size_t readSize;
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219 /* Whether a read() can return data spanning multiple zstd frames. */
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220 int readAcrossFrames;
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221 /* Buffer to read from (if reading from a buffer). */
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222 Py_buffer buffer;
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223
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224 /* Whether the context manager is active. */
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225 int entered;
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226 /* Whether we've closed the stream. */
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227 int closed;
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228
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229 /* Number of bytes decompressed and returned to user. */
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230 unsigned long long bytesDecompressed;
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231
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232 /* Tracks data going into decompressor. */
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233 ZSTD_inBuffer input;
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234
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235 /* Holds output from read() operation on reader. */
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236 PyObject* readResult;
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237
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238 /* Whether all input has been sent to the decompressor. */
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239 int finishedInput;
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240 /* Whether all output has been flushed from the decompressor. */
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241 int finishedOutput;
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242 } ZstdDecompressionReader;
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243
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244 extern PyTypeObject ZstdDecompressionReaderType;
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245
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246 typedef struct {
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247 PyObject_HEAD
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248
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249 ZstdDecompressor* decompressor;
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250 PyObject* writer;
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251 size_t outSize;
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252 int entered;
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253 int closed;
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254 int writeReturnRead;
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255 } ZstdDecompressionWriter;
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256
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257 extern PyTypeObject ZstdDecompressionWriterType;
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258
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259 typedef struct {
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260 PyObject_HEAD
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261
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262 ZstdDecompressor* decompressor;
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263 PyObject* reader;
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264 Py_buffer buffer;
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265 Py_ssize_t bufferOffset;
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266 size_t inSize;
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267 size_t outSize;
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268 size_t skipBytes;
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269 ZSTD_inBuffer input;
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270 ZSTD_outBuffer output;
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271 Py_ssize_t readCount;
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272 int finishedInput;
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273 int finishedOutput;
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274 } ZstdDecompressorIterator;
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275
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276 extern PyTypeObject ZstdDecompressorIteratorType;
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277
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278 typedef struct {
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279 int errored;
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280 PyObject* chunk;
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281 } DecompressorIteratorResult;
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282
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283 typedef struct {
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284 /* The public API is that these are 64-bit unsigned integers. So these can't
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285 * be size_t, even though values larger than SIZE_MAX or PY_SSIZE_T_MAX may
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286 * be nonsensical for this platform. */
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287 unsigned long long offset;
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288 unsigned long long length;
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289 } BufferSegment;
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290
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291 typedef struct {
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292 PyObject_HEAD
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293
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294 PyObject* parent;
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295 BufferSegment* segments;
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296 Py_ssize_t segmentCount;
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297 } ZstdBufferSegments;
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298
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299 extern PyTypeObject ZstdBufferSegmentsType;
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300
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301 typedef struct {
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302 PyObject_HEAD
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303
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304 PyObject* parent;
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305 void* data;
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306 Py_ssize_t dataSize;
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307 unsigned long long offset;
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308 } ZstdBufferSegment;
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309
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310 extern PyTypeObject ZstdBufferSegmentType;
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311
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312 typedef struct {
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313 PyObject_HEAD
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314
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315 Py_buffer parent;
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316 void* data;
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317 unsigned long long dataSize;
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318 BufferSegment* segments;
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319 Py_ssize_t segmentCount;
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320 int useFree;
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321 } ZstdBufferWithSegments;
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322
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323 extern PyTypeObject ZstdBufferWithSegmentsType;
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324
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325 /**
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326 * An ordered collection of BufferWithSegments exposed as a squashed collection.
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327 *
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328 * This type provides a virtual view spanning multiple BufferWithSegments
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329 * instances. It allows multiple instances to be "chained" together and
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330 * exposed as a single collection. e.g. if there are 2 buffers holding
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331 * 10 segments each, then o[14] will access the 5th segment in the 2nd buffer.
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332 */
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333 typedef struct {
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334 PyObject_HEAD
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335
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336 /* An array of buffers that should be exposed through this instance. */
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337 ZstdBufferWithSegments** buffers;
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338 /* Number of elements in buffers array. */
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339 Py_ssize_t bufferCount;
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340 /* Array of first offset in each buffer instance. 0th entry corresponds
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341 to number of elements in the 0th buffer. 1st entry corresponds to the
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342 sum of elements in 0th and 1st buffers. */
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343 Py_ssize_t* firstElements;
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344 } ZstdBufferWithSegmentsCollection;
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345
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346 extern PyTypeObject ZstdBufferWithSegmentsCollectionType;
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347
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348 int set_parameter(ZSTD_CCtx_params* params, ZSTD_cParameter param, int value);
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349 int set_parameters(ZSTD_CCtx_params* params, ZstdCompressionParametersObject* obj);
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350 int to_cparams(ZstdCompressionParametersObject* params, ZSTD_compressionParameters* cparams);
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351 FrameParametersObject* get_frame_parameters(PyObject* self, PyObject* args, PyObject* kwargs);
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352 int ensure_ddict(ZstdCompressionDict* dict);
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353 int ensure_dctx(ZstdDecompressor* decompressor, int loadDict);
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354 ZstdCompressionDict* train_dictionary(PyObject* self, PyObject* args, PyObject* kwargs);
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355 ZstdBufferWithSegments* BufferWithSegments_FromMemory(void* data, unsigned long long dataSize, BufferSegment* segments, Py_ssize_t segmentsSize);
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356 Py_ssize_t BufferWithSegmentsCollection_length(ZstdBufferWithSegmentsCollection*);
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357 int cpu_count(void);
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358 size_t roundpow2(size_t);
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359 int safe_pybytes_resize(PyObject** obj, Py_ssize_t size);