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annotate contrib/python-zstandard/c-ext/decompressobj.c @ 37495:b1fb341d8a61

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zstandard: vendor python-zstandard 0.9.0 This was just released. It features a number of goodies. More info at https://gregoryszorc.com/blog/2018/04/09/release-of-python-zstandard-0.9/. The clang-format ignore list was updated to reflect the new source of files. The project contains a vendored copy of zstandard 1.3.4. The old version was 1.1.3. One of the changes between those versions is that zstandard is now dual licensed BSD + GPLv2 and the patent rights grant has been removed. Good riddance. The API should be backwards compatible. So no changes in core should be needed. However, there were a number of changes in the library that we'll want to adapt to. Those will be addressed in subsequent commits. Differential Revision: https://phab.mercurial-scm.org/D3198
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 09 Apr 2018 10:13:29 -0700
parents e0dc40530c5a
children 73fef626dae3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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Gregory Szorc <gregory.szorc@gmail.com>
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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(DecompressionObj__doc__,
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14 "Perform decompression using a standard library compatible API.\n"
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15 );
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16
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17 static void DecompressionObj_dealloc(ZstdDecompressionObj* self) {
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18 Py_XDECREF(self->decompressor);
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19
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20 PyObject_Del(self);
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21 }
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22
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23 static PyObject* DecompressionObj_decompress(ZstdDecompressionObj* self, PyObject* args, PyObject* kwargs) {
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24 static char* kwlist[] = {
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25 "data",
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26 NULL
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27 };
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28
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29 Py_buffer source;
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30 size_t zresult;
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31 ZSTD_inBuffer input;
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32 ZSTD_outBuffer output;
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33 PyObject* result = NULL;
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34 Py_ssize_t resultSize = 0;
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35
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36 if (self->finished) {
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37 PyErr_SetString(ZstdError, "cannot use a decompressobj multiple times");
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38 return NULL;
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39 }
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40
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41 #if PY_MAJOR_VERSION >= 3
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42 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:decompress",
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43 #else
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44 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:decompress",
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45 #endif
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46 kwlist, &source)) {
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47 return NULL;
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48 }
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49
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50 if (!PyBuffer_IsContiguous(&source, 'C') || source.ndim > 1) {
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51 PyErr_SetString(PyExc_ValueError,
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52 "data buffer should be contiguous and have at most one dimension");
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53 goto finally;
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54 }
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55
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56 input.src = source.buf;
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57 input.size = source.len;
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58 input.pos = 0;
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59
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60 output.dst = PyMem_Malloc(self->outSize);
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61 if (!output.dst) {
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62 PyErr_NoMemory();
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63 goto except;
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64 }
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65 output.size = self->outSize;
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66 output.pos = 0;
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67
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68 /* Read input until exhausted. */
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69 while (input.pos < input.size) {
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70 Py_BEGIN_ALLOW_THREADS
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71 zresult = ZSTD_decompress_generic(self->decompressor->dctx, &output, &input);
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72 Py_END_ALLOW_THREADS
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73
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74 if (ZSTD_isError(zresult)) {
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75 PyErr_Format(ZstdError, "zstd decompressor error: %s",
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76 ZSTD_getErrorName(zresult));
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77 goto except;
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78 }
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79
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80 if (0 == zresult) {
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81 self->finished = 1;
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82 }
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83
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84 if (output.pos) {
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85 if (result) {
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86 resultSize = PyBytes_GET_SIZE(result);
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87 if (-1 == safe_pybytes_resize(&result, resultSize + output.pos)) {
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88 Py_XDECREF(result);
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89 goto except;
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90 }
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91
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92 memcpy(PyBytes_AS_STRING(result) + resultSize,
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parents:
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93 output.dst, output.pos);
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94 }
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parents:
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95 else {
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96 result = PyBytes_FromStringAndSize(output.dst, output.pos);
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parents:
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97 if (!result) {
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98 goto except;
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99 }
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100 }
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101
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102 output.pos = 0;
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103 }
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104 }
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105
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106 if (!result) {
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107 result = PyBytes_FromString("");
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108 }
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109
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110 goto finally;
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parents:
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111
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112 except:
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113 Py_CLEAR(result);
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114
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115 finally:
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116 PyMem_Free(output.dst);
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117 PyBuffer_Release(&source);
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118
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119 return result;
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120 }
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121
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122 static PyMethodDef DecompressionObj_methods[] = {
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123 { "decompress", (PyCFunction)DecompressionObj_decompress,
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124 METH_VARARGS | METH_KEYWORDS, PyDoc_STR("decompress data") },
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parents:
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125 { NULL, NULL }
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parents:
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126 };
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127
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128 PyTypeObject ZstdDecompressionObjType = {
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parents:
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129 PyVarObject_HEAD_INIT(NULL, 0)
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130 "zstd.ZstdDecompressionObj", /* tp_name */
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parents:
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131 sizeof(ZstdDecompressionObj), /* tp_basicsize */
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parents:
diff changeset
132 0, /* tp_itemsize */
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133 (destructor)DecompressionObj_dealloc, /* tp_dealloc */
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134 0, /* tp_print */
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Gregory Szorc <gregory.szorc@gmail.com>
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135 0, /* tp_getattr */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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136 0, /* tp_setattr */
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Gregory Szorc <gregory.szorc@gmail.com>
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137 0, /* tp_compare */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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138 0, /* tp_repr */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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139 0, /* tp_as_number */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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140 0, /* tp_as_sequence */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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141 0, /* tp_as_mapping */
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Gregory Szorc <gregory.szorc@gmail.com>
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142 0, /* tp_hash */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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143 0, /* tp_call */
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Gregory Szorc <gregory.szorc@gmail.com>
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144 0, /* tp_str */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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145 0, /* tp_getattro */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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146 0, /* tp_setattro */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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147 0, /* tp_as_buffer */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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148 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
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Gregory Szorc <gregory.szorc@gmail.com>
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149 DecompressionObj__doc__, /* tp_doc */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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150 0, /* tp_traverse */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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151 0, /* tp_clear */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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152 0, /* tp_richcompare */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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153 0, /* tp_weaklistoffset */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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154 0, /* tp_iter */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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155 0, /* tp_iternext */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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156 DecompressionObj_methods, /* tp_methods */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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157 0, /* tp_members */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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158 0, /* tp_getset */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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159 0, /* tp_base */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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160 0, /* tp_dict */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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161 0, /* tp_descr_get */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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162 0, /* tp_descr_set */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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163 0, /* tp_dictoffset */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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164 0, /* tp_init */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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165 0, /* tp_alloc */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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166 PyType_GenericNew, /* tp_new */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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167 };
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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168
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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169 void decompressobj_module_init(PyObject* module) {
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parents:
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170 Py_TYPE(&ZstdDecompressionObjType) = &PyType_Type;
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parents:
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171 if (PyType_Ready(&ZstdDecompressionObjType) < 0) {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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172 return;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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173 }
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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174 }