Mercurial > hg
annotate contrib/python-zstandard/c-ext/decompressionwriter.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(ZstdDecompressionWriter__doc, |
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14 """A context manager used for writing decompressed output.\n" |
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15 ); |
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16 |
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17 static void ZstdDecompressionWriter_dealloc(ZstdDecompressionWriter* self) { |
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18 Py_XDECREF(self->decompressor); |
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19 Py_XDECREF(self->writer); |
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20 |
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21 PyObject_Del(self); |
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22 } |
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23 |
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24 static PyObject* ZstdDecompressionWriter_enter(ZstdDecompressionWriter* self) { |
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25 if (self->entered) { |
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26 PyErr_SetString(ZstdError, "cannot __enter__ multiple times"); |
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27 return NULL; |
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28 } |
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29 |
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30 if (0 != init_dstream(self->decompressor)) { |
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31 return NULL; |
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32 } |
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33 |
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34 self->entered = 1; |
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35 |
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36 Py_INCREF(self); |
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37 return (PyObject*)self; |
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38 } |
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39 |
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40 static PyObject* ZstdDecompressionWriter_exit(ZstdDecompressionWriter* self, PyObject* args) { |
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41 self->entered = 0; |
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42 |
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43 Py_RETURN_FALSE; |
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44 } |
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45 |
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46 static PyObject* ZstdDecompressionWriter_memory_size(ZstdDecompressionWriter* self) { |
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47 if (!self->decompressor->dstream) { |
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48 PyErr_SetString(ZstdError, "cannot determine size of inactive decompressor; " |
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49 "call when context manager is active"); |
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50 return NULL; |
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51 } |
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52 |
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53 return PyLong_FromSize_t(ZSTD_sizeof_DStream(self->decompressor->dstream)); |
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54 } |
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55 |
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56 static PyObject* ZstdDecompressionWriter_write(ZstdDecompressionWriter* self, PyObject* args) { |
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57 const char* source; |
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58 Py_ssize_t sourceSize; |
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59 size_t zresult = 0; |
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60 ZSTD_inBuffer input; |
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61 ZSTD_outBuffer output; |
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62 PyObject* res; |
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63 Py_ssize_t totalWrite = 0; |
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64 |
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65 #if PY_MAJOR_VERSION >= 3 |
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66 if (!PyArg_ParseTuple(args, "y#:write", &source, &sourceSize)) { |
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67 #else |
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68 if (!PyArg_ParseTuple(args, "s#:write", &source, &sourceSize)) { |
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69 #endif |
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70 return NULL; |
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71 } |
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72 |
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73 if (!self->entered) { |
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74 PyErr_SetString(ZstdError, "write must be called from an active context manager"); |
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75 return NULL; |
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76 } |
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77 |
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78 assert(self->decompressor->dstream); |
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79 |
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80 output.dst = PyMem_Malloc(self->outSize); |
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81 if (!output.dst) { |
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82 return PyErr_NoMemory(); |
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83 } |
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84 output.size = self->outSize; |
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85 output.pos = 0; |
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86 |
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87 input.src = source; |
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88 input.size = sourceSize; |
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89 input.pos = 0; |
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90 |
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91 while ((ssize_t)input.pos < sourceSize) { |
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92 Py_BEGIN_ALLOW_THREADS |
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93 zresult = ZSTD_decompressStream(self->decompressor->dstream, &output, &input); |
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94 Py_END_ALLOW_THREADS |
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95 |
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96 if (ZSTD_isError(zresult)) { |
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97 PyMem_Free(output.dst); |
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98 PyErr_Format(ZstdError, "zstd decompress error: %s", |
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99 ZSTD_getErrorName(zresult)); |
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100 return NULL; |
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101 } |
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102 |
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103 if (output.pos) { |
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104 #if PY_MAJOR_VERSION >= 3 |
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105 res = PyObject_CallMethod(self->writer, "write", "y#", |
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106 #else |
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107 res = PyObject_CallMethod(self->writer, "write", "s#", |
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108 #endif |
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109 output.dst, output.pos); |
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110 Py_XDECREF(res); |
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111 totalWrite += output.pos; |
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112 output.pos = 0; |
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113 } |
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114 } |
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115 |
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116 PyMem_Free(output.dst); |
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117 |
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118 return PyLong_FromSsize_t(totalWrite); |
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119 } |
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120 |
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121 static PyMethodDef ZstdDecompressionWriter_methods[] = { |
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122 { "__enter__", (PyCFunction)ZstdDecompressionWriter_enter, METH_NOARGS, |
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123 PyDoc_STR("Enter a decompression context.") }, |
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124 { "__exit__", (PyCFunction)ZstdDecompressionWriter_exit, METH_VARARGS, |
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125 PyDoc_STR("Exit a decompression context.") }, |
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126 { "memory_size", (PyCFunction)ZstdDecompressionWriter_memory_size, METH_NOARGS, |
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127 PyDoc_STR("Obtain the memory size in bytes of the underlying decompressor.") }, |
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128 { "write", (PyCFunction)ZstdDecompressionWriter_write, METH_VARARGS, |
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129 PyDoc_STR("Compress data") }, |
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130 { NULL, NULL } |
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131 }; |
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132 |
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133 PyTypeObject ZstdDecompressionWriterType = { |
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134 PyVarObject_HEAD_INIT(NULL, 0) |
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135 "zstd.ZstdDecompressionWriter", /* tp_name */ |
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136 sizeof(ZstdDecompressionWriter),/* tp_basicsize */ |
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137 0, /* tp_itemsize */ |
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138 (destructor)ZstdDecompressionWriter_dealloc, /* tp_dealloc */ |
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139 0, /* tp_print */ |
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140 0, /* tp_getattr */ |
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141 0, /* tp_setattr */ |
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142 0, /* tp_compare */ |
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143 0, /* tp_repr */ |
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144 0, /* tp_as_number */ |
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145 0, /* tp_as_sequence */ |
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146 0, /* tp_as_mapping */ |
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147 0, /* tp_hash */ |
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148 0, /* tp_call */ |
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149 0, /* tp_str */ |
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150 0, /* tp_getattro */ |
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151 0, /* tp_setattro */ |
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152 0, /* tp_as_buffer */ |
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153 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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154 ZstdDecompressionWriter__doc, /* tp_doc */ |
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155 0, /* tp_traverse */ |
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156 0, /* tp_clear */ |
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157 0, /* tp_richcompare */ |
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158 0, /* tp_weaklistoffset */ |
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159 0, /* tp_iter */ |
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160 0, /* tp_iternext */ |
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161 ZstdDecompressionWriter_methods,/* tp_methods */ |
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162 0, /* tp_members */ |
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163 0, /* tp_getset */ |
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164 0, /* tp_base */ |
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165 0, /* tp_dict */ |
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166 0, /* tp_descr_get */ |
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167 0, /* tp_descr_set */ |
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168 0, /* tp_dictoffset */ |
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169 0, /* tp_init */ |
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170 0, /* tp_alloc */ |
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171 PyType_GenericNew, /* tp_new */ |
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172 }; |
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173 |
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174 void decompressionwriter_module_init(PyObject* mod) { |
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175 Py_TYPE(&ZstdDecompressionWriterType) = &PyType_Type; |
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176 if (PyType_Ready(&ZstdDecompressionWriterType) < 0) { |
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177 return; |
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178 } |
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179 } |