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annotate contrib/python-zstandard/c-ext/python-zstandard.h @ 42941:69de49c4e39c

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zstandard: vendor python-zstandard 0.12 The upstream source distribution from PyPI was extracted. Unwanted files were removed. The clang-format ignore list was updated to reflect the new source of files. test-repo-compengines.t was updated to reflect a change in behavior of the zstd library. The project contains a vendored copy of zstandard 1.4.3. The old version was 1.3.8. This should result in some minor performance wins. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D6858
author Gregory Szorc <gregory.szorc@gmail.com>
date Sun, 15 Sep 2019 20:04:00 -0700
parents 675775c33ab6
children de7838053207
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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 "0.12.0"
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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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25
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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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35
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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;
42070
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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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diff changeset
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;
42070
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253 int closed;
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Gregory Szorc <gregory.szorc@gmail.com>
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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);