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annotate contrib/python-zstandard/c-ext/python-zstandard.h @ 31796:e0dc40530c5a

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zstd: vendor python-zstandard 0.8.0 Commit 81e1f5bbf1fc54808649562d3ed829730765c540 from https://github.com/indygreg/python-zstandard is imported without modifications (other than removing unwanted files). Updates relevant to Mercurial include: * Support for multi-threaded compression (we can use this for bundle and wire protocol compression). * APIs for batch compression and decompression operations using multiple threads and optimal memory allocation mechanism. (Can be useful for revlog perf improvements.) * A ``BufferWithSegments`` type that models a single memory buffer containing N discrete items of known lengths. This type can be used for very efficient 0-copy data operations. # no-check-commit
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 01 Apr 2017 15:24:03 -0700
parents c32454d69b85
children 39d36c2db68e
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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 "mem.h"
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16 #include "zstd.h"
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17 #include "zdict.h"
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18 #include "zstdmt_compress.h"
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19
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20 #define PYTHON_ZSTANDARD_VERSION "0.8.0"
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21
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22 typedef enum {
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23 compressorobj_flush_finish,
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24 compressorobj_flush_block,
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25 } CompressorObj_Flush;
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26
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27 /*
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28 Represents a CompressionParameters type.
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29
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30 This type is basically a wrapper around ZSTD_compressionParameters.
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31 */
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32 typedef struct {
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33 PyObject_HEAD
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34 unsigned windowLog;
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35 unsigned chainLog;
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36 unsigned hashLog;
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37 unsigned searchLog;
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38 unsigned searchLength;
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39 unsigned targetLength;
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40 ZSTD_strategy strategy;
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41 } CompressionParametersObject;
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42
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43 extern PyTypeObject CompressionParametersType;
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44
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45 /*
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46 Represents a FrameParameters type.
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47
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48 This type is basically a wrapper around ZSTD_frameParams.
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49 */
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50 typedef struct {
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51 PyObject_HEAD
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52 unsigned long long frameContentSize;
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53 unsigned windowSize;
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54 unsigned dictID;
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55 char checksumFlag;
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56 } FrameParametersObject;
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57
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58 extern PyTypeObject FrameParametersType;
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59
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60 /*
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61 Represents a ZstdCompressionDict type.
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62
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63 Instances hold data used for a zstd compression dictionary.
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64 */
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65 typedef struct {
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66 PyObject_HEAD
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67
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68 /* Pointer to dictionary data. Owned by self. */
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69 void* dictData;
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70 /* Size of dictionary data. */
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71 size_t dictSize;
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72 /* k parameter for cover dictionaries. Only populated by train_cover_dict(). */
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73 unsigned k;
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74 /* d parameter for cover dictionaries. Only populated by train_cover_dict(). */
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75 unsigned d;
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76 } ZstdCompressionDict;
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77
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78 extern PyTypeObject ZstdCompressionDictType;
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79
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80 /*
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81 Represents a ZstdCompressor type.
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82 */
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83 typedef struct {
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84 PyObject_HEAD
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85
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86 /* Configured compression level. Should be always set. */
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87 int compressionLevel;
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88 /* Number of threads to use for operations. */
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89 unsigned int threads;
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90 /* Pointer to compression dictionary to use. NULL if not using dictionary
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91 compression. */
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92 ZstdCompressionDict* dict;
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93 /* Compression context to use. Populated during object construction. NULL
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94 if using multi-threaded compression. */
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95 ZSTD_CCtx* cctx;
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96 /* Multi-threaded compression context to use. Populated during object
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97 construction. NULL if not using multi-threaded compression. */
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98 ZSTDMT_CCtx* mtcctx;
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99 /* Digest compression dictionary. NULL initially. Populated on first use. */
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100 ZSTD_CDict* cdict;
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101 /* Low-level compression parameter control. NULL unless passed to
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102 constructor. Takes precedence over `compressionLevel` if defined. */
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103 CompressionParametersObject* cparams;
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104 /* Controls zstd frame options. */
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105 ZSTD_frameParameters fparams;
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106 /* Holds state for streaming compression. Shared across all invocation.
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107 Populated on first use. */
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108 ZSTD_CStream* cstream;
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109 } ZstdCompressor;
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110
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111 extern PyTypeObject ZstdCompressorType;
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112
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113 typedef struct {
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114 PyObject_HEAD
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115
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116 ZstdCompressor* compressor;
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117 ZSTD_outBuffer output;
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118 int finished;
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119 } ZstdCompressionObj;
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120
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121 extern PyTypeObject ZstdCompressionObjType;
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122
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123 typedef struct {
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124 PyObject_HEAD
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125
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126 ZstdCompressor* compressor;
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127 PyObject* writer;
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128 Py_ssize_t sourceSize;
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129 size_t outSize;
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130 int entered;
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131 } ZstdCompressionWriter;
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132
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133 extern PyTypeObject ZstdCompressionWriterType;
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134
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135 typedef struct {
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136 PyObject_HEAD
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137
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138 ZstdCompressor* compressor;
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139 PyObject* reader;
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140 Py_buffer* buffer;
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141 Py_ssize_t bufferOffset;
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142 Py_ssize_t sourceSize;
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143 size_t inSize;
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144 size_t outSize;
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145
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146 ZSTD_inBuffer input;
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147 ZSTD_outBuffer output;
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148 int finishedOutput;
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149 int finishedInput;
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150 PyObject* readResult;
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151 } ZstdCompressorIterator;
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152
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153 extern PyTypeObject ZstdCompressorIteratorType;
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154
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155 typedef struct {
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156 PyObject_HEAD
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157
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158 ZSTD_DCtx* dctx;
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159
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160 ZstdCompressionDict* dict;
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161 ZSTD_DDict* ddict;
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162 ZSTD_DStream* dstream;
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163 } ZstdDecompressor;
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164
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165 extern PyTypeObject ZstdDecompressorType;
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166
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167 typedef struct {
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168 PyObject_HEAD
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169
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170 ZstdDecompressor* decompressor;
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171 int finished;
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172 } ZstdDecompressionObj;
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173
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174 extern PyTypeObject ZstdDecompressionObjType;
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175
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176 typedef struct {
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177 PyObject_HEAD
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178
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179 ZstdDecompressor* decompressor;
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180 PyObject* writer;
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181 size_t outSize;
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182 int entered;
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183 } ZstdDecompressionWriter;
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184
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185 extern PyTypeObject ZstdDecompressionWriterType;
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186
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187 typedef struct {
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188 PyObject_HEAD
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189
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190 ZstdDecompressor* decompressor;
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191 PyObject* reader;
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192 Py_buffer* buffer;
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193 Py_ssize_t bufferOffset;
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194 size_t inSize;
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195 size_t outSize;
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196 size_t skipBytes;
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197 ZSTD_inBuffer input;
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198 ZSTD_outBuffer output;
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199 Py_ssize_t readCount;
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200 int finishedInput;
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201 int finishedOutput;
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202 } ZstdDecompressorIterator;
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203
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204 extern PyTypeObject ZstdDecompressorIteratorType;
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205
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206 typedef struct {
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207 int errored;
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208 PyObject* chunk;
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209 } DecompressorIteratorResult;
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210
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211 typedef struct {
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212 unsigned long long offset;
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213 unsigned long long length;
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214 } BufferSegment;
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215
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216 typedef struct {
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217 PyObject_HEAD
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218
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219 PyObject* parent;
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220 BufferSegment* segments;
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221 Py_ssize_t segmentCount;
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222 } ZstdBufferSegments;
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223
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224 extern PyTypeObject ZstdBufferSegmentsType;
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225
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226 typedef struct {
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227 PyObject_HEAD
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228
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229 PyObject* parent;
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230 void* data;
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231 Py_ssize_t dataSize;
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232 unsigned long long offset;
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233 } ZstdBufferSegment;
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234
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235 extern PyTypeObject ZstdBufferSegmentType;
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236
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237 typedef struct {
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238 PyObject_HEAD
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239
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240 Py_buffer parent;
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241 void* data;
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242 unsigned long long dataSize;
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243 BufferSegment* segments;
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244 Py_ssize_t segmentCount;
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245 int useFree;
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246 } ZstdBufferWithSegments;
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247
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248 extern PyTypeObject ZstdBufferWithSegmentsType;
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249
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250 /**
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251 * An ordered collection of BufferWithSegments exposed as a squashed collection.
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252 *
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253 * This type provides a virtual view spanning multiple BufferWithSegments
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254 * instances. It allows multiple instances to be "chained" together and
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255 * exposed as a single collection. e.g. if there are 2 buffers holding
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256 * 10 segments each, then o[14] will access the 5th segment in the 2nd buffer.
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257 */
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258 typedef struct {
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259 PyObject_HEAD
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260
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261 /* An array of buffers that should be exposed through this instance. */
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262 ZstdBufferWithSegments** buffers;
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263 /* Number of elements in buffers array. */
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264 Py_ssize_t bufferCount;
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265 /* Array of first offset in each buffer instance. 0th entry corresponds
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266 to number of elements in the 0th buffer. 1st entry corresponds to the
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267 sum of elements in 0th and 1st buffers. */
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268 Py_ssize_t* firstElements;
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269 } ZstdBufferWithSegmentsCollection;
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270
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271 extern PyTypeObject ZstdBufferWithSegmentsCollectionType;
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272
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273 void ztopy_compression_parameters(CompressionParametersObject* params, ZSTD_compressionParameters* zparams);
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274 CompressionParametersObject* get_compression_parameters(PyObject* self, PyObject* args);
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275 FrameParametersObject* get_frame_parameters(PyObject* self, PyObject* args);
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276 PyObject* estimate_compression_context_size(PyObject* self, PyObject* args);
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277 int init_cstream(ZstdCompressor* compressor, unsigned long long sourceSize);
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278 int init_mtcstream(ZstdCompressor* compressor, Py_ssize_t sourceSize);
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279 int init_dstream(ZstdDecompressor* decompressor);
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280 ZstdCompressionDict* train_dictionary(PyObject* self, PyObject* args, PyObject* kwargs);
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281 ZstdCompressionDict* train_cover_dictionary(PyObject* self, PyObject* args, PyObject* kwargs);
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282 ZstdBufferWithSegments* BufferWithSegments_FromMemory(void* data, unsigned long long dataSize, BufferSegment* segments, Py_ssize_t segmentsSize);
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283 Py_ssize_t BufferWithSegmentsCollection_length(ZstdBufferWithSegmentsCollection*);
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284 int cpu_count(void);
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285 size_t roundpow2(size_t);