Mercurial > hg
annotate contrib/python-zstandard/c-ext/compressiondict.c @ 43084:c2e284cee333
import-checker: allow symbol imports from mercurial.pycompat
Currently, the source transformer inserts
`from mercurial.pycompat import delattr, getattr, hasattr, setattr, open, unicode`
to the top of every file. As part of getting rid of the source transformer,
we'll need to have source code call these wrappers directly. Rather than
rewrite all call sites to call pycompat.*, I think it makes sense to import
needed symbols via explicit imports. That requires loosening the import checker
to allow this.
Differential Revision: https://phab.mercurial-scm.org/D7004
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 06 Oct 2019 13:17:19 -0400 |
parents | 675775c33ab6 |
children | e92ca942ddca |
rev | line source |
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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 extern PyObject* ZstdError; |
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12 |
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13 ZstdCompressionDict* train_dictionary(PyObject* self, PyObject* args, PyObject* kwargs) { |
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14 static char* kwlist[] = { |
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15 "dict_size", |
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16 "samples", |
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17 "k", |
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18 "d", |
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19 "notifications", |
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20 "dict_id", |
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21 "level", |
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22 "steps", |
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23 "threads", |
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24 NULL |
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25 }; |
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26 |
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27 size_t capacity; |
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28 PyObject* samples; |
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29 unsigned k = 0; |
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30 unsigned d = 0; |
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31 unsigned notifications = 0; |
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32 unsigned dictID = 0; |
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33 int level = 0; |
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34 unsigned steps = 0; |
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35 int threads = 0; |
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36 ZDICT_cover_params_t params; |
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37 Py_ssize_t samplesLen; |
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38 Py_ssize_t i; |
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39 size_t samplesSize = 0; |
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40 void* sampleBuffer = NULL; |
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41 size_t* sampleSizes = NULL; |
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42 void* sampleOffset; |
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43 Py_ssize_t sampleSize; |
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44 void* dict = NULL; |
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45 size_t zresult; |
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46 ZstdCompressionDict* result = NULL; |
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47 |
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48 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "nO!|IIIIiIi:train_dictionary", |
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49 kwlist, &capacity, &PyList_Type, &samples, |
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50 &k, &d, ¬ifications, &dictID, &level, &steps, &threads)) { |
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51 return NULL; |
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52 } |
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53 |
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54 if (threads < 0) { |
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55 threads = cpu_count(); |
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56 } |
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57 |
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58 memset(¶ms, 0, sizeof(params)); |
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59 params.k = k; |
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60 params.d = d; |
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61 params.steps = steps; |
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62 params.nbThreads = threads; |
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63 params.zParams.notificationLevel = notifications; |
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64 params.zParams.dictID = dictID; |
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65 params.zParams.compressionLevel = level; |
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66 |
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67 /* Figure out total size of input samples. */ |
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68 samplesLen = PyList_Size(samples); |
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69 for (i = 0; i < samplesLen; i++) { |
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70 PyObject* sampleItem = PyList_GET_ITEM(samples, i); |
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71 |
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72 if (!PyBytes_Check(sampleItem)) { |
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73 PyErr_SetString(PyExc_ValueError, "samples must be bytes"); |
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74 return NULL; |
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75 } |
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76 samplesSize += PyBytes_GET_SIZE(sampleItem); |
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77 } |
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78 |
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79 sampleBuffer = PyMem_Malloc(samplesSize); |
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80 if (!sampleBuffer) { |
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81 PyErr_NoMemory(); |
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82 goto finally; |
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83 } |
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84 |
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85 sampleSizes = PyMem_Malloc(samplesLen * sizeof(size_t)); |
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86 if (!sampleSizes) { |
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87 PyErr_NoMemory(); |
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88 goto finally; |
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89 } |
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90 |
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91 sampleOffset = sampleBuffer; |
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92 for (i = 0; i < samplesLen; i++) { |
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93 PyObject* sampleItem = PyList_GET_ITEM(samples, i); |
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94 sampleSize = PyBytes_GET_SIZE(sampleItem); |
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95 sampleSizes[i] = sampleSize; |
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96 memcpy(sampleOffset, PyBytes_AS_STRING(sampleItem), sampleSize); |
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97 sampleOffset = (char*)sampleOffset + sampleSize; |
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98 } |
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99 |
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100 dict = PyMem_Malloc(capacity); |
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101 if (!dict) { |
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102 PyErr_NoMemory(); |
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103 goto finally; |
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104 } |
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105 |
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106 Py_BEGIN_ALLOW_THREADS |
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107 /* No parameters uses the default function, which will use default params |
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108 and call ZDICT_optimizeTrainFromBuffer_cover under the hood. */ |
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109 if (!params.k && !params.d && !params.zParams.compressionLevel |
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110 && !params.zParams.notificationLevel && !params.zParams.dictID) { |
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111 zresult = ZDICT_trainFromBuffer(dict, capacity, sampleBuffer, |
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112 sampleSizes, (unsigned)samplesLen); |
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113 } |
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114 /* Use optimize mode if user controlled steps or threads explicitly. */ |
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115 else if (params.steps || params.nbThreads) { |
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116 zresult = ZDICT_optimizeTrainFromBuffer_cover(dict, capacity, |
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117 sampleBuffer, sampleSizes, (unsigned)samplesLen, ¶ms); |
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118 } |
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119 /* Non-optimize mode with explicit control. */ |
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120 else { |
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121 zresult = ZDICT_trainFromBuffer_cover(dict, capacity, |
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122 sampleBuffer, sampleSizes, (unsigned)samplesLen, params); |
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123 } |
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124 Py_END_ALLOW_THREADS |
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125 |
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126 if (ZDICT_isError(zresult)) { |
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127 PyMem_Free(dict); |
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128 PyErr_Format(ZstdError, "cannot train dict: %s", ZDICT_getErrorName(zresult)); |
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129 goto finally; |
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130 } |
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131 |
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132 result = PyObject_New(ZstdCompressionDict, &ZstdCompressionDictType); |
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133 if (!result) { |
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134 PyMem_Free(dict); |
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135 goto finally; |
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136 } |
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137 |
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138 result->dictData = dict; |
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139 result->dictSize = zresult; |
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140 result->dictType = ZSTD_dct_fullDict; |
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141 result->d = params.d; |
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142 result->k = params.k; |
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143 result->cdict = NULL; |
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144 result->ddict = NULL; |
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145 |
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146 finally: |
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147 PyMem_Free(sampleBuffer); |
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148 PyMem_Free(sampleSizes); |
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149 |
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150 return result; |
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151 } |
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152 |
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153 int ensure_ddict(ZstdCompressionDict* dict) { |
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154 if (dict->ddict) { |
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155 return 0; |
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156 } |
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157 |
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158 Py_BEGIN_ALLOW_THREADS |
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159 dict->ddict = ZSTD_createDDict_advanced(dict->dictData, dict->dictSize, |
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160 ZSTD_dlm_byRef, dict->dictType, ZSTD_defaultCMem); |
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161 Py_END_ALLOW_THREADS |
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162 if (!dict->ddict) { |
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163 PyErr_SetString(ZstdError, "could not create decompression dict"); |
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164 return 1; |
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165 } |
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166 |
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167 return 0; |
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168 } |
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169 |
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170 PyDoc_STRVAR(ZstdCompressionDict__doc__, |
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171 "ZstdCompressionDict(data) - Represents a computed compression dictionary\n" |
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172 "\n" |
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173 "This type holds the results of a computed Zstandard compression dictionary.\n" |
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174 "Instances are obtained by calling ``train_dictionary()`` or by passing\n" |
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175 "bytes obtained from another source into the constructor.\n" |
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176 ); |
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177 |
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178 static int ZstdCompressionDict_init(ZstdCompressionDict* self, PyObject* args, PyObject* kwargs) { |
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179 static char* kwlist[] = { |
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180 "data", |
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181 "dict_type", |
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182 NULL |
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183 }; |
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184 |
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185 int result = -1; |
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186 Py_buffer source; |
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187 unsigned dictType = ZSTD_dct_auto; |
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188 |
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189 self->dictData = NULL; |
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190 self->dictSize = 0; |
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191 self->cdict = NULL; |
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192 self->ddict = NULL; |
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193 |
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|
194 #if PY_MAJOR_VERSION >= 3 |
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195 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*|I:ZstdCompressionDict", |
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196 #else |
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197 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*|I:ZstdCompressionDict", |
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198 #endif |
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199 kwlist, &source, &dictType)) { |
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200 return -1; |
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|
201 } |
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|
202 |
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203 if (!PyBuffer_IsContiguous(&source, 'C') || source.ndim > 1) { |
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204 PyErr_SetString(PyExc_ValueError, |
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205 "data buffer should be contiguous and have at most one dimension"); |
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206 goto finally; |
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207 } |
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|
208 |
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209 if (dictType != ZSTD_dct_auto && dictType != ZSTD_dct_rawContent |
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210 && dictType != ZSTD_dct_fullDict) { |
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211 PyErr_Format(PyExc_ValueError, |
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212 "invalid dictionary load mode: %d; must use DICT_TYPE_* constants", |
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|
213 dictType); |
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214 goto finally; |
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|
215 } |
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216 |
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|
217 self->dictType = dictType; |
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218 |
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219 self->dictData = PyMem_Malloc(source.len); |
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220 if (!self->dictData) { |
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|
221 PyErr_NoMemory(); |
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222 goto finally; |
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|
223 } |
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224 |
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225 memcpy(self->dictData, source.buf, source.len); |
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226 self->dictSize = source.len; |
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227 |
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228 result = 0; |
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229 |
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230 finally: |
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231 PyBuffer_Release(&source); |
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232 return result; |
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233 } |
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234 |
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235 static void ZstdCompressionDict_dealloc(ZstdCompressionDict* self) { |
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236 if (self->cdict) { |
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237 ZSTD_freeCDict(self->cdict); |
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238 self->cdict = NULL; |
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239 } |
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240 |
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241 if (self->ddict) { |
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242 ZSTD_freeDDict(self->ddict); |
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243 self->ddict = NULL; |
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244 } |
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245 |
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246 if (self->dictData) { |
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247 PyMem_Free(self->dictData); |
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248 self->dictData = NULL; |
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249 } |
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250 |
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251 PyObject_Del(self); |
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252 } |
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253 |
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254 PyDoc_STRVAR(ZstdCompressionDict_precompute_compress__doc__, |
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255 "Precompute a dictionary so it can be used by multiple compressors.\n" |
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256 ); |
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257 |
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258 static PyObject* ZstdCompressionDict_precompute_compress(ZstdCompressionDict* self, PyObject* args, PyObject* kwargs) { |
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259 static char* kwlist[] = { |
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260 "level", |
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261 "compression_params", |
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262 NULL |
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263 }; |
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264 |
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265 int level = 0; |
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266 ZstdCompressionParametersObject* compressionParams = NULL; |
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267 ZSTD_compressionParameters cParams; |
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268 size_t zresult; |
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269 |
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270 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|iO!:precompute_compress", kwlist, |
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271 &level, &ZstdCompressionParametersType, &compressionParams)) { |
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272 return NULL; |
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273 } |
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274 |
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275 if (level && compressionParams) { |
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276 PyErr_SetString(PyExc_ValueError, |
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277 "must only specify one of level or compression_params"); |
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278 return NULL; |
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279 } |
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280 |
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281 if (!level && !compressionParams) { |
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282 PyErr_SetString(PyExc_ValueError, |
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283 "must specify one of level or compression_params"); |
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284 return NULL; |
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285 } |
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286 |
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287 if (self->cdict) { |
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288 zresult = ZSTD_freeCDict(self->cdict); |
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289 self->cdict = NULL; |
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290 if (ZSTD_isError(zresult)) { |
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291 PyErr_Format(ZstdError, "unable to free CDict: %s", |
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292 ZSTD_getErrorName(zresult)); |
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293 return NULL; |
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294 } |
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295 } |
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296 |
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297 if (level) { |
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298 cParams = ZSTD_getCParams(level, 0, self->dictSize); |
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299 } |
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300 else { |
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301 if (to_cparams(compressionParams, &cParams)) { |
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302 return NULL; |
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303 } |
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304 } |
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305 |
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306 assert(!self->cdict); |
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307 self->cdict = ZSTD_createCDict_advanced(self->dictData, self->dictSize, |
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308 ZSTD_dlm_byRef, self->dictType, cParams, ZSTD_defaultCMem); |
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309 |
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310 if (!self->cdict) { |
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311 PyErr_SetString(ZstdError, "unable to precompute dictionary"); |
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312 return NULL; |
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313 } |
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314 |
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315 Py_RETURN_NONE; |
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316 } |
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317 |
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318 static PyObject* ZstdCompressionDict_dict_id(ZstdCompressionDict* self) { |
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319 unsigned dictID = ZDICT_getDictID(self->dictData, self->dictSize); |
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320 |
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321 return PyLong_FromLong(dictID); |
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322 } |
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323 |
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324 static PyObject* ZstdCompressionDict_as_bytes(ZstdCompressionDict* self) { |
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325 return PyBytes_FromStringAndSize(self->dictData, self->dictSize); |
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326 } |
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327 |
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328 static PyMethodDef ZstdCompressionDict_methods[] = { |
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329 { "dict_id", (PyCFunction)ZstdCompressionDict_dict_id, METH_NOARGS, |
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330 PyDoc_STR("dict_id() -- obtain the numeric dictionary ID") }, |
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331 { "as_bytes", (PyCFunction)ZstdCompressionDict_as_bytes, METH_NOARGS, |
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332 PyDoc_STR("as_bytes() -- obtain the raw bytes constituting the dictionary data") }, |
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333 { "precompute_compress", (PyCFunction)ZstdCompressionDict_precompute_compress, |
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334 METH_VARARGS | METH_KEYWORDS, ZstdCompressionDict_precompute_compress__doc__ }, |
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335 { NULL, NULL } |
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336 }; |
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337 |
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338 static PyMemberDef ZstdCompressionDict_members[] = { |
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339 { "k", T_UINT, offsetof(ZstdCompressionDict, k), READONLY, |
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340 "segment size" }, |
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341 { "d", T_UINT, offsetof(ZstdCompressionDict, d), READONLY, |
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342 "dmer size" }, |
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343 { NULL } |
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344 }; |
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345 |
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346 static Py_ssize_t ZstdCompressionDict_length(ZstdCompressionDict* self) { |
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347 return self->dictSize; |
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348 } |
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349 |
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350 static PySequenceMethods ZstdCompressionDict_sq = { |
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351 (lenfunc)ZstdCompressionDict_length, /* sq_length */ |
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352 0, /* sq_concat */ |
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353 0, /* sq_repeat */ |
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354 0, /* sq_item */ |
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355 0, /* sq_ass_item */ |
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356 0, /* sq_contains */ |
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357 0, /* sq_inplace_concat */ |
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358 0 /* sq_inplace_repeat */ |
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359 }; |
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360 |
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361 PyTypeObject ZstdCompressionDictType = { |
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362 PyVarObject_HEAD_INIT(NULL, 0) |
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363 "zstd.ZstdCompressionDict", /* tp_name */ |
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364 sizeof(ZstdCompressionDict), /* tp_basicsize */ |
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365 0, /* tp_itemsize */ |
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366 (destructor)ZstdCompressionDict_dealloc, /* tp_dealloc */ |
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367 0, /* tp_print */ |
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368 0, /* tp_getattr */ |
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369 0, /* tp_setattr */ |
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370 0, /* tp_compare */ |
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371 0, /* tp_repr */ |
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372 0, /* tp_as_number */ |
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373 &ZstdCompressionDict_sq, /* tp_as_sequence */ |
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374 0, /* tp_as_mapping */ |
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375 0, /* tp_hash */ |
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376 0, /* tp_call */ |
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377 0, /* tp_str */ |
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378 0, /* tp_getattro */ |
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379 0, /* tp_setattro */ |
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380 0, /* tp_as_buffer */ |
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381 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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382 ZstdCompressionDict__doc__, /* tp_doc */ |
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383 0, /* tp_traverse */ |
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384 0, /* tp_clear */ |
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385 0, /* tp_richcompare */ |
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386 0, /* tp_weaklistoffset */ |
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387 0, /* tp_iter */ |
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388 0, /* tp_iternext */ |
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389 ZstdCompressionDict_methods, /* tp_methods */ |
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390 ZstdCompressionDict_members, /* tp_members */ |
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391 0, /* tp_getset */ |
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392 0, /* tp_base */ |
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393 0, /* tp_dict */ |
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394 0, /* tp_descr_get */ |
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395 0, /* tp_descr_set */ |
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396 0, /* tp_dictoffset */ |
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397 (initproc)ZstdCompressionDict_init, /* tp_init */ |
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398 0, /* tp_alloc */ |
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399 PyType_GenericNew, /* tp_new */ |
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400 }; |
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401 |
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402 void compressiondict_module_init(PyObject* mod) { |
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403 Py_TYPE(&ZstdCompressionDictType) = &PyType_Type; |
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404 if (PyType_Ready(&ZstdCompressionDictType) < 0) { |
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405 return; |
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406 } |
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407 |
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408 Py_INCREF((PyObject*)&ZstdCompressionDictType); |
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409 PyModule_AddObject(mod, "ZstdCompressionDict", |
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410 (PyObject*)&ZstdCompressionDictType); |
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411 } |