Mercurial > hg
annotate contrib/python-zstandard/c-ext/decompressionwriter.c @ 31266:8089de5fab89
dispatch: add pagination of two more help cases
I missed these in the last round anf Yuya spotted them in
review. Thanks!
author | Augie Fackler <augie@google.com> |
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date | Wed, 08 Mar 2017 18:32:42 -0500 |
parents | c32454d69b85 |
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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 if (self->dstream) { |
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22 ZSTD_freeDStream(self->dstream); |
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23 self->dstream = NULL; |
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24 } |
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25 |
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26 PyObject_Del(self); |
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27 } |
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28 |
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29 static PyObject* ZstdDecompressionWriter_enter(ZstdDecompressionWriter* self) { |
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30 if (self->entered) { |
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31 PyErr_SetString(ZstdError, "cannot __enter__ multiple times"); |
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32 return NULL; |
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33 } |
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34 |
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35 self->dstream = DStream_from_ZstdDecompressor(self->decompressor); |
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36 if (!self->dstream) { |
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37 return NULL; |
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38 } |
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39 |
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40 self->entered = 1; |
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41 |
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42 Py_INCREF(self); |
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43 return (PyObject*)self; |
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44 } |
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45 |
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46 static PyObject* ZstdDecompressionWriter_exit(ZstdDecompressionWriter* self, PyObject* args) { |
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47 self->entered = 0; |
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48 |
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49 if (self->dstream) { |
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50 ZSTD_freeDStream(self->dstream); |
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51 self->dstream = NULL; |
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52 } |
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53 |
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54 Py_RETURN_FALSE; |
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55 } |
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56 |
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57 static PyObject* ZstdDecompressionWriter_memory_size(ZstdDecompressionWriter* self) { |
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58 if (!self->dstream) { |
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59 PyErr_SetString(ZstdError, "cannot determine size of inactive decompressor; " |
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60 "call when context manager is active"); |
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61 return NULL; |
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62 } |
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63 |
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64 return PyLong_FromSize_t(ZSTD_sizeof_DStream(self->dstream)); |
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65 } |
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66 |
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67 static PyObject* ZstdDecompressionWriter_write(ZstdDecompressionWriter* self, PyObject* args) { |
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68 const char* source; |
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69 Py_ssize_t sourceSize; |
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70 size_t zresult = 0; |
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71 ZSTD_inBuffer input; |
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72 ZSTD_outBuffer output; |
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73 PyObject* res; |
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74 Py_ssize_t totalWrite = 0; |
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75 |
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76 #if PY_MAJOR_VERSION >= 3 |
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77 if (!PyArg_ParseTuple(args, "y#:write", &source, &sourceSize)) { |
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78 #else |
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79 if (!PyArg_ParseTuple(args, "s#:write", &source, &sourceSize)) { |
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80 #endif |
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81 return NULL; |
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82 } |
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83 |
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84 if (!self->entered) { |
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85 PyErr_SetString(ZstdError, "write must be called from an active context manager"); |
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86 return NULL; |
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87 } |
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88 |
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89 output.dst = PyMem_Malloc(self->outSize); |
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90 if (!output.dst) { |
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91 return PyErr_NoMemory(); |
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92 } |
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93 output.size = self->outSize; |
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94 output.pos = 0; |
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95 |
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96 input.src = source; |
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97 input.size = sourceSize; |
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98 input.pos = 0; |
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99 |
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100 while ((ssize_t)input.pos < sourceSize) { |
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101 Py_BEGIN_ALLOW_THREADS |
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102 zresult = ZSTD_decompressStream(self->dstream, &output, &input); |
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103 Py_END_ALLOW_THREADS |
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104 |
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105 if (ZSTD_isError(zresult)) { |
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106 PyMem_Free(output.dst); |
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107 PyErr_Format(ZstdError, "zstd decompress error: %s", |
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108 ZSTD_getErrorName(zresult)); |
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109 return NULL; |
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110 } |
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111 |
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112 if (output.pos) { |
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113 #if PY_MAJOR_VERSION >= 3 |
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114 res = PyObject_CallMethod(self->writer, "write", "y#", |
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115 #else |
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116 res = PyObject_CallMethod(self->writer, "write", "s#", |
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117 #endif |
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118 output.dst, output.pos); |
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119 Py_XDECREF(res); |
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120 totalWrite += output.pos; |
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121 output.pos = 0; |
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122 } |
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123 } |
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124 |
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125 PyMem_Free(output.dst); |
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126 |
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127 return PyLong_FromSsize_t(totalWrite); |
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128 } |
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129 |
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130 static PyMethodDef ZstdDecompressionWriter_methods[] = { |
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131 { "__enter__", (PyCFunction)ZstdDecompressionWriter_enter, METH_NOARGS, |
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132 PyDoc_STR("Enter a decompression context.") }, |
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133 { "__exit__", (PyCFunction)ZstdDecompressionWriter_exit, METH_VARARGS, |
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134 PyDoc_STR("Exit a decompression context.") }, |
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135 { "memory_size", (PyCFunction)ZstdDecompressionWriter_memory_size, METH_NOARGS, |
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136 PyDoc_STR("Obtain the memory size in bytes of the underlying decompressor.") }, |
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137 { "write", (PyCFunction)ZstdDecompressionWriter_write, METH_VARARGS, |
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138 PyDoc_STR("Compress data") }, |
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139 { NULL, NULL } |
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140 }; |
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141 |
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142 PyTypeObject ZstdDecompressionWriterType = { |
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143 PyVarObject_HEAD_INIT(NULL, 0) |
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144 "zstd.ZstdDecompressionWriter", /* tp_name */ |
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145 sizeof(ZstdDecompressionWriter),/* tp_basicsize */ |
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146 0, /* tp_itemsize */ |
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147 (destructor)ZstdDecompressionWriter_dealloc, /* tp_dealloc */ |
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148 0, /* tp_print */ |
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149 0, /* tp_getattr */ |
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150 0, /* tp_setattr */ |
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151 0, /* tp_compare */ |
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152 0, /* tp_repr */ |
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153 0, /* tp_as_number */ |
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154 0, /* tp_as_sequence */ |
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155 0, /* tp_as_mapping */ |
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156 0, /* tp_hash */ |
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157 0, /* tp_call */ |
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158 0, /* tp_str */ |
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159 0, /* tp_getattro */ |
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160 0, /* tp_setattro */ |
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161 0, /* tp_as_buffer */ |
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162 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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163 ZstdDecompressionWriter__doc, /* tp_doc */ |
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164 0, /* tp_traverse */ |
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165 0, /* tp_clear */ |
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166 0, /* tp_richcompare */ |
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167 0, /* tp_weaklistoffset */ |
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168 0, /* tp_iter */ |
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169 0, /* tp_iternext */ |
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170 ZstdDecompressionWriter_methods,/* tp_methods */ |
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171 0, /* tp_members */ |
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172 0, /* tp_getset */ |
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173 0, /* tp_base */ |
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174 0, /* tp_dict */ |
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175 0, /* tp_descr_get */ |
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176 0, /* tp_descr_set */ |
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177 0, /* tp_dictoffset */ |
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178 0, /* tp_init */ |
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179 0, /* tp_alloc */ |
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180 PyType_GenericNew, /* tp_new */ |
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181 }; |
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182 |
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183 void decompressionwriter_module_init(PyObject* mod) { |
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184 Py_TYPE(&ZstdDecompressionWriterType) = &PyType_Type; |
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185 if (PyType_Ready(&ZstdDecompressionWriterType) < 0) { |
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186 return; |
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187 } |
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188 } |