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annotate contrib/python-zstandard/c-ext/compressionparams.c @ 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 b1fb341d8a61
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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 #include "python-zstandard.h"
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10
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11 void ztopy_compression_parameters(CompressionParametersObject* params, ZSTD_compressionParameters* zparams) {
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12 zparams->windowLog = params->windowLog;
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13 zparams->chainLog = params->chainLog;
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14 zparams->hashLog = params->hashLog;
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15 zparams->searchLog = params->searchLog;
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16 zparams->searchLength = params->searchLength;
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17 zparams->targetLength = params->targetLength;
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18 zparams->strategy = params->strategy;
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19 }
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20
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21 CompressionParametersObject* get_compression_parameters(PyObject* self, PyObject* args) {
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22 int compressionLevel;
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23 unsigned PY_LONG_LONG sourceSize = 0;
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24 Py_ssize_t dictSize = 0;
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25 ZSTD_compressionParameters params;
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26 CompressionParametersObject* result;
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27
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28 if (!PyArg_ParseTuple(args, "i|Kn:get_compression_parameters",
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29 &compressionLevel, &sourceSize, &dictSize)) {
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30 return NULL;
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31 }
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32
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33 params = ZSTD_getCParams(compressionLevel, sourceSize, dictSize);
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34
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35 result = PyObject_New(CompressionParametersObject, &CompressionParametersType);
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36 if (!result) {
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37 return NULL;
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38 }
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39
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40 result->windowLog = params.windowLog;
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41 result->chainLog = params.chainLog;
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42 result->hashLog = params.hashLog;
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43 result->searchLog = params.searchLog;
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44 result->searchLength = params.searchLength;
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45 result->targetLength = params.targetLength;
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46 result->strategy = params.strategy;
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47
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48 return result;
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49 }
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50
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51 static int CompressionParameters_init(CompressionParametersObject* self, PyObject* args, PyObject* kwargs) {
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52 static char* kwlist[] = {
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53 "window_log",
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54 "chain_log",
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55 "hash_log",
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56 "search_log",
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57 "search_length",
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58 "target_length",
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59 "strategy",
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60 NULL
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61 };
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62
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63 unsigned windowLog;
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64 unsigned chainLog;
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65 unsigned hashLog;
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66 unsigned searchLog;
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67 unsigned searchLength;
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68 unsigned targetLength;
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69 unsigned strategy;
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70 ZSTD_compressionParameters params;
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71 size_t zresult;
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72
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73 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "IIIIIII:CompressionParameters",
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74 kwlist, &windowLog, &chainLog, &hashLog, &searchLog, &searchLength,
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75 &targetLength, &strategy)) {
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76 return -1;
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77 }
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78
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79 if (windowLog < ZSTD_WINDOWLOG_MIN || windowLog > ZSTD_WINDOWLOG_MAX) {
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80 PyErr_SetString(PyExc_ValueError, "invalid window log value");
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81 return -1;
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82 }
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83
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84 if (chainLog < ZSTD_CHAINLOG_MIN || chainLog > ZSTD_CHAINLOG_MAX) {
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85 PyErr_SetString(PyExc_ValueError, "invalid chain log value");
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86 return -1;
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87 }
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88
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89 if (hashLog < ZSTD_HASHLOG_MIN || hashLog > ZSTD_HASHLOG_MAX) {
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90 PyErr_SetString(PyExc_ValueError, "invalid hash log value");
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91 return -1;
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92 }
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93
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94 if (searchLog < ZSTD_SEARCHLOG_MIN || searchLog > ZSTD_SEARCHLOG_MAX) {
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95 PyErr_SetString(PyExc_ValueError, "invalid search log value");
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96 return -1;
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97 }
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98
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99 if (searchLength < ZSTD_SEARCHLENGTH_MIN || searchLength > ZSTD_SEARCHLENGTH_MAX) {
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100 PyErr_SetString(PyExc_ValueError, "invalid search length value");
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101 return -1;
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102 }
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103
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104 if (targetLength < ZSTD_TARGETLENGTH_MIN || targetLength > ZSTD_TARGETLENGTH_MAX) {
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105 PyErr_SetString(PyExc_ValueError, "invalid target length value");
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106 return -1;
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107 }
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108
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109 if (strategy < ZSTD_fast || strategy > ZSTD_btopt) {
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110 PyErr_SetString(PyExc_ValueError, "invalid strategy value");
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111 return -1;
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112 }
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113
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114 self->windowLog = windowLog;
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115 self->chainLog = chainLog;
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116 self->hashLog = hashLog;
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117 self->searchLog = searchLog;
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118 self->searchLength = searchLength;
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119 self->targetLength = targetLength;
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120 self->strategy = strategy;
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121
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122 ztopy_compression_parameters(self, &params);
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123 zresult = ZSTD_checkCParams(params);
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124
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125 if (ZSTD_isError(zresult)) {
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126 PyErr_Format(PyExc_ValueError, "invalid compression parameters: %s",
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127 ZSTD_getErrorName(zresult));
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128 return -1;
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129 }
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130
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131 return 0;
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132 }
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133
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134 PyDoc_STRVAR(CompressionParameters_estimated_compression_context_size__doc__,
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135 "Estimate the size in bytes of a compression context for compression parameters\n"
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136 );
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137
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138 PyObject* CompressionParameters_estimated_compression_context_size(CompressionParametersObject* self) {
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139 ZSTD_compressionParameters params;
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140
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141 ztopy_compression_parameters(self, &params);
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142
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143 return PyLong_FromSize_t(ZSTD_estimateCCtxSize(params));
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144 }
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145
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146 PyObject* estimate_compression_context_size(PyObject* self, PyObject* args) {
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147 CompressionParametersObject* params;
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148 ZSTD_compressionParameters zparams;
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149 PyObject* result;
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150
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151 if (!PyArg_ParseTuple(args, "O!:estimate_compression_context_size",
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152 &CompressionParametersType, &params)) {
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153 return NULL;
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154 }
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155
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156 ztopy_compression_parameters(params, &zparams);
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157 result = PyLong_FromSize_t(ZSTD_estimateCCtxSize(zparams));
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158 return result;
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159 }
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160
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161 PyDoc_STRVAR(CompressionParameters__doc__,
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162 "CompressionParameters: low-level control over zstd compression");
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163
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164 static void CompressionParameters_dealloc(PyObject* self) {
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165 PyObject_Del(self);
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166 }
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167
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168 static PyMethodDef CompressionParameters_methods[] = {
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169 {
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170 "estimated_compression_context_size",
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171 (PyCFunction)CompressionParameters_estimated_compression_context_size,
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172 METH_NOARGS,
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173 CompressionParameters_estimated_compression_context_size__doc__
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174 },
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175 { NULL, NULL }
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176 };
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177
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178 static PyMemberDef CompressionParameters_members[] = {
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179 { "window_log", T_UINT,
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180 offsetof(CompressionParametersObject, windowLog), READONLY,
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181 "window log" },
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182 { "chain_log", T_UINT,
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183 offsetof(CompressionParametersObject, chainLog), READONLY,
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184 "chain log" },
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185 { "hash_log", T_UINT,
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186 offsetof(CompressionParametersObject, hashLog), READONLY,
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187 "hash log" },
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188 { "search_log", T_UINT,
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189 offsetof(CompressionParametersObject, searchLog), READONLY,
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190 "search log" },
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191 { "search_length", T_UINT,
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192 offsetof(CompressionParametersObject, searchLength), READONLY,
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193 "search length" },
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194 { "target_length", T_UINT,
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195 offsetof(CompressionParametersObject, targetLength), READONLY,
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196 "target length" },
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197 { "strategy", T_INT,
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198 offsetof(CompressionParametersObject, strategy), READONLY,
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199 "strategy" },
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200 { NULL }
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201 };
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202
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203 PyTypeObject CompressionParametersType = {
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204 PyVarObject_HEAD_INIT(NULL, 0)
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205 "CompressionParameters", /* tp_name */
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206 sizeof(CompressionParametersObject), /* tp_basicsize */
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207 0, /* tp_itemsize */
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208 (destructor)CompressionParameters_dealloc, /* tp_dealloc */
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209 0, /* tp_print */
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210 0, /* tp_getattr */
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211 0, /* tp_setattr */
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212 0, /* tp_compare */
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213 0, /* tp_repr */
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214 0, /* tp_as_number */
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215 0, /* tp_as_sequence */
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216 0, /* tp_as_mapping */
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217 0, /* tp_hash */
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218 0, /* tp_call */
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219 0, /* tp_str */
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220 0, /* tp_getattro */
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221 0, /* tp_setattro */
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222 0, /* tp_as_buffer */
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223 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
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224 CompressionParameters__doc__, /* tp_doc */
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225 0, /* tp_traverse */
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226 0, /* tp_clear */
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227 0, /* tp_richcompare */
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228 0, /* tp_weaklistoffset */
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229 0, /* tp_iter */
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230 0, /* tp_iternext */
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231 CompressionParameters_methods, /* tp_methods */
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232 CompressionParameters_members, /* tp_members */
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233 0, /* tp_getset */
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234 0, /* tp_base */
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235 0, /* tp_dict */
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236 0, /* tp_descr_get */
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diff changeset
237 0, /* tp_descr_set */
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diff changeset
238 0, /* tp_dictoffset */
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diff changeset
239 (initproc)CompressionParameters_init, /* tp_init */
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240 0, /* tp_alloc */
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241 PyType_GenericNew, /* tp_new */
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242 };
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243
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parents:
diff changeset
244 void compressionparams_module_init(PyObject* mod) {
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245 Py_TYPE(&CompressionParametersType) = &PyType_Type;
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246 if (PyType_Ready(&CompressionParametersType) < 0) {
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parents:
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247 return;
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248 }
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249
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diff changeset
250 Py_INCREF(&CompressionParametersType);
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251 PyModule_AddObject(mod, "CompressionParameters",
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parents:
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252 (PyObject*)&CompressionParametersType);
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parents:
diff changeset
253 }