Mercurial > hg
annotate contrib/python-zstandard/c-ext/compressobj.c @ 37013:b6a7070e7663
debugcommands: support sending HTTP requests with debugwireproto
We implement an action that can issue an HTTP request. We can define
headers via arguments and specify a file to use for the HTTP request
body.
The request uses the HTTP peer's opener, which is already configured
for auth, etc. This is both good and bad. Good in that we get some
nice behavior out of the box. Bad in that some HTTP request headers
are added automatically.
Differential Revision: https://phab.mercurial-scm.org/D2841
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 13 Mar 2018 11:17:10 -0700 |
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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 PyDoc_STRVAR(ZstdCompressionObj__doc__, |
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14 "Perform compression using a standard library compatible API.\n" |
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15 ); |
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16 |
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17 static void ZstdCompressionObj_dealloc(ZstdCompressionObj* self) { |
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18 PyMem_Free(self->output.dst); |
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19 self->output.dst = NULL; |
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20 |
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21 Py_XDECREF(self->compressor); |
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22 |
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23 PyObject_Del(self); |
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24 } |
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25 |
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26 static PyObject* ZstdCompressionObj_compress(ZstdCompressionObj* self, PyObject* args) { |
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27 const char* source; |
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28 Py_ssize_t sourceSize; |
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29 ZSTD_inBuffer input; |
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30 size_t zresult; |
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31 PyObject* result = NULL; |
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32 Py_ssize_t resultSize = 0; |
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33 |
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34 if (self->finished) { |
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35 PyErr_SetString(ZstdError, "cannot call compress() after compressor finished"); |
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36 return NULL; |
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37 } |
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38 |
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39 #if PY_MAJOR_VERSION >= 3 |
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40 if (!PyArg_ParseTuple(args, "y#:compress", &source, &sourceSize)) { |
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41 #else |
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42 if (!PyArg_ParseTuple(args, "s#:compress", &source, &sourceSize)) { |
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43 #endif |
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44 return NULL; |
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45 } |
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46 |
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47 input.src = source; |
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48 input.size = sourceSize; |
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49 input.pos = 0; |
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50 |
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51 while ((ssize_t)input.pos < sourceSize) { |
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52 Py_BEGIN_ALLOW_THREADS |
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53 if (self->compressor->mtcctx) { |
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54 zresult = ZSTDMT_compressStream(self->compressor->mtcctx, |
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55 &self->output, &input); |
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56 } |
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57 else { |
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58 zresult = ZSTD_compressStream(self->compressor->cstream, &self->output, &input); |
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59 } |
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60 Py_END_ALLOW_THREADS |
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61 |
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62 if (ZSTD_isError(zresult)) { |
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63 PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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64 return NULL; |
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65 } |
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66 |
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67 if (self->output.pos) { |
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68 if (result) { |
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69 resultSize = PyBytes_GET_SIZE(result); |
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70 if (-1 == _PyBytes_Resize(&result, resultSize + self->output.pos)) { |
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71 return NULL; |
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72 } |
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73 |
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74 memcpy(PyBytes_AS_STRING(result) + resultSize, |
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75 self->output.dst, self->output.pos); |
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76 } |
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77 else { |
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78 result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos); |
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79 if (!result) { |
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80 return NULL; |
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81 } |
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82 } |
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83 |
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84 self->output.pos = 0; |
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85 } |
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86 } |
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87 |
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88 if (result) { |
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89 return result; |
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90 } |
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91 else { |
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92 return PyBytes_FromString(""); |
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93 } |
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94 } |
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95 |
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96 static PyObject* ZstdCompressionObj_flush(ZstdCompressionObj* self, PyObject* args) { |
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97 int flushMode = compressorobj_flush_finish; |
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98 size_t zresult; |
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99 PyObject* result = NULL; |
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100 Py_ssize_t resultSize = 0; |
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101 |
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102 if (!PyArg_ParseTuple(args, "|i:flush", &flushMode)) { |
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103 return NULL; |
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104 } |
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105 |
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106 if (flushMode != compressorobj_flush_finish && flushMode != compressorobj_flush_block) { |
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107 PyErr_SetString(PyExc_ValueError, "flush mode not recognized"); |
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108 return NULL; |
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109 } |
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110 |
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111 if (self->finished) { |
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112 PyErr_SetString(ZstdError, "compressor object already finished"); |
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113 return NULL; |
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114 } |
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115 |
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116 assert(self->output.pos == 0); |
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117 |
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118 if (flushMode == compressorobj_flush_block) { |
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119 /* The output buffer is of size ZSTD_CStreamOutSize(), which is |
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120 guaranteed to hold a full block. */ |
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121 Py_BEGIN_ALLOW_THREADS |
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122 if (self->compressor->mtcctx) { |
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123 zresult = ZSTDMT_flushStream(self->compressor->mtcctx, &self->output); |
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124 } |
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125 else { |
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126 zresult = ZSTD_flushStream(self->compressor->cstream, &self->output); |
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127 } |
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128 Py_END_ALLOW_THREADS |
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129 |
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130 if (ZSTD_isError(zresult)) { |
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131 PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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132 return NULL; |
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133 } |
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134 |
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135 /* Output buffer is guaranteed to hold full block. */ |
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136 assert(zresult == 0); |
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137 |
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138 if (self->output.pos) { |
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139 result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos); |
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140 if (!result) { |
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141 return NULL; |
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142 } |
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143 } |
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144 |
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145 self->output.pos = 0; |
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146 |
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147 if (result) { |
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148 return result; |
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149 } |
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150 else { |
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151 return PyBytes_FromString(""); |
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152 } |
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153 } |
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154 |
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155 assert(flushMode == compressorobj_flush_finish); |
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156 self->finished = 1; |
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157 |
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158 while (1) { |
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159 if (self->compressor->mtcctx) { |
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160 zresult = ZSTDMT_endStream(self->compressor->mtcctx, &self->output); |
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161 } |
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162 else { |
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163 zresult = ZSTD_endStream(self->compressor->cstream, &self->output); |
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164 } |
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165 if (ZSTD_isError(zresult)) { |
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166 PyErr_Format(ZstdError, "error ending compression stream: %s", |
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167 ZSTD_getErrorName(zresult)); |
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168 return NULL; |
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169 } |
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170 |
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171 if (self->output.pos) { |
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172 if (result) { |
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173 resultSize = PyBytes_GET_SIZE(result); |
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174 if (-1 == _PyBytes_Resize(&result, resultSize + self->output.pos)) { |
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175 return NULL; |
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176 } |
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177 |
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178 memcpy(PyBytes_AS_STRING(result) + resultSize, |
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179 self->output.dst, self->output.pos); |
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180 } |
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181 else { |
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182 result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos); |
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183 if (!result) { |
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184 return NULL; |
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185 } |
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186 } |
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187 |
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188 self->output.pos = 0; |
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189 } |
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190 |
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|
191 if (!zresult) { |
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192 break; |
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193 } |
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|
194 } |
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195 |
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196 if (result) { |
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197 return result; |
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|
198 } |
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199 else { |
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200 return PyBytes_FromString(""); |
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201 } |
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|
202 } |
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|
203 |
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|
204 static PyMethodDef ZstdCompressionObj_methods[] = { |
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205 { "compress", (PyCFunction)ZstdCompressionObj_compress, METH_VARARGS, |
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|
206 PyDoc_STR("compress data") }, |
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207 { "flush", (PyCFunction)ZstdCompressionObj_flush, METH_VARARGS, |
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|
208 PyDoc_STR("finish compression operation") }, |
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|
209 { NULL, NULL } |
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|
210 }; |
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|
211 |
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|
212 PyTypeObject ZstdCompressionObjType = { |
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|
213 PyVarObject_HEAD_INIT(NULL, 0) |
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|
214 "zstd.ZstdCompressionObj", /* tp_name */ |
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|
215 sizeof(ZstdCompressionObj), /* tp_basicsize */ |
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|
216 0, /* tp_itemsize */ |
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|
217 (destructor)ZstdCompressionObj_dealloc, /* tp_dealloc */ |
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|
218 0, /* tp_print */ |
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|
219 0, /* tp_getattr */ |
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|
220 0, /* tp_setattr */ |
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|
221 0, /* tp_compare */ |
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|
222 0, /* tp_repr */ |
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|
223 0, /* tp_as_number */ |
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|
224 0, /* tp_as_sequence */ |
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|
225 0, /* tp_as_mapping */ |
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|
226 0, /* tp_hash */ |
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|
227 0, /* tp_call */ |
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|
228 0, /* tp_str */ |
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|
229 0, /* tp_getattro */ |
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|
230 0, /* tp_setattro */ |
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|
231 0, /* tp_as_buffer */ |
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|
232 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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|
233 ZstdCompressionObj__doc__, /* tp_doc */ |
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|
234 0, /* tp_traverse */ |
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|
235 0, /* tp_clear */ |
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|
236 0, /* tp_richcompare */ |
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237 0, /* tp_weaklistoffset */ |
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238 0, /* tp_iter */ |
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239 0, /* tp_iternext */ |
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240 ZstdCompressionObj_methods, /* tp_methods */ |
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241 0, /* tp_members */ |
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242 0, /* tp_getset */ |
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243 0, /* tp_base */ |
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244 0, /* tp_dict */ |
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245 0, /* tp_descr_get */ |
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246 0, /* tp_descr_set */ |
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247 0, /* tp_dictoffset */ |
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248 0, /* tp_init */ |
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249 0, /* tp_alloc */ |
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250 PyType_GenericNew, /* tp_new */ |
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251 }; |
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252 |
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253 void compressobj_module_init(PyObject* module) { |
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254 Py_TYPE(&ZstdCompressionObjType) = &PyType_Type; |
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255 if (PyType_Ready(&ZstdCompressionObjType) < 0) { |
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256 return; |
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257 } |
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258 } |