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annotate contrib/python-zstandard/c-ext/decompressobj.c @ 40121:73fef626dae3

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zstandard: vendor python-zstandard 0.10.1 This was just released. The upstream source distribution from PyPI was extracted. Unwanted files were removed. The clang-format ignore list was updated to reflect the new source of files. setup.py was updated to pass a new argument to python-zstandard's function for returning an Extension instance. Upstream had to change to use relative paths because Python 3.7's packaging doesn't seem to like absolute paths when defining sources, includes, etc. The default relative path calculation is relative to setup_zstd.py which is different from the directory of Mercurial's setup.py. The project contains a vendored copy of zstandard 1.3.6. The old version was 1.3.4. The API should be backwards compatible and nothing in core should need adjusted. However, there is a new "chunker" API that we may find useful in places where we want to emit compressed chunks of a fixed size. There are a pair of bug fixes in 0.10.0 with regards to compressobj() and decompressobj() when block flushing is used. I actually found these bugs when introducing these APIs in Mercurial! But existing Mercurial code is not affected because we don't perform block flushing. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D4911
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 08 Oct 2018 16:27:40 -0700
parents b1fb341d8a61
children 675775c33ab6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 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 output.dst = NULL;
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37
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38 if (self->finished) {
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39 PyErr_SetString(ZstdError, "cannot use a decompressobj multiple times");
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40 return NULL;
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41 }
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42
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43 #if PY_MAJOR_VERSION >= 3
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44 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:decompress",
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45 #else
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46 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:decompress",
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47 #endif
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48 kwlist, &source)) {
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49 return NULL;
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50 }
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51
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52 if (!PyBuffer_IsContiguous(&source, 'C') || source.ndim > 1) {
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53 PyErr_SetString(PyExc_ValueError,
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54 "data buffer should be contiguous and have at most one dimension");
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55 goto finally;
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56 }
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57
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58 /* Special case of empty input. Output will always be empty. */
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59 if (source.len == 0) {
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60 result = PyBytes_FromString("");
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61 goto finally;
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62 }
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63
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64 input.src = source.buf;
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65 input.size = source.len;
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66 input.pos = 0;
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67
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68 output.dst = PyMem_Malloc(self->outSize);
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69 if (!output.dst) {
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70 PyErr_NoMemory();
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71 goto except;
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72 }
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73 output.size = self->outSize;
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74 output.pos = 0;
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75
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76 while (1) {
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77 Py_BEGIN_ALLOW_THREADS
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78 zresult = ZSTD_decompress_generic(self->decompressor->dctx, &output, &input);
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79 Py_END_ALLOW_THREADS
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80
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81 if (ZSTD_isError(zresult)) {
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82 PyErr_Format(ZstdError, "zstd decompressor error: %s",
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83 ZSTD_getErrorName(zresult));
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84 goto except;
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85 }
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86
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87 if (0 == zresult) {
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88 self->finished = 1;
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89 }
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90
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91 if (output.pos) {
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92 if (result) {
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93 resultSize = PyBytes_GET_SIZE(result);
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94 if (-1 == safe_pybytes_resize(&result, resultSize + output.pos)) {
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parents: 31796
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95 Py_XDECREF(result);
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96 goto except;
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97 }
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98
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99 memcpy(PyBytes_AS_STRING(result) + resultSize,
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parents:
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100 output.dst, output.pos);
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101 }
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102 else {
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103 result = PyBytes_FromStringAndSize(output.dst, output.pos);
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104 if (!result) {
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105 goto except;
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106 }
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107 }
40121
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108 }
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109
40121
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110 if (zresult == 0 || (input.pos == input.size && output.pos == 0)) {
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111 break;
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112 }
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113
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114 output.pos = 0;
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115 }
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116
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117 if (!result) {
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118 result = PyBytes_FromString("");
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119 }
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120
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121 goto finally;
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122
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123 except:
31796
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124 Py_CLEAR(result);
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125
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126 finally:
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127 PyMem_Free(output.dst);
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128 PyBuffer_Release(&source);
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129
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130 return result;
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131 }
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132
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133 static PyMethodDef DecompressionObj_methods[] = {
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134 { "decompress", (PyCFunction)DecompressionObj_decompress,
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135 METH_VARARGS | METH_KEYWORDS, PyDoc_STR("decompress data") },
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136 { NULL, NULL }
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137 };
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138
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139 PyTypeObject ZstdDecompressionObjType = {
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140 PyVarObject_HEAD_INIT(NULL, 0)
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141 "zstd.ZstdDecompressionObj", /* tp_name */
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142 sizeof(ZstdDecompressionObj), /* tp_basicsize */
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143 0, /* tp_itemsize */
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144 (destructor)DecompressionObj_dealloc, /* tp_dealloc */
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145 0, /* tp_print */
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146 0, /* tp_getattr */
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147 0, /* tp_setattr */
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148 0, /* tp_compare */
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149 0, /* tp_repr */
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150 0, /* tp_as_number */
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151 0, /* tp_as_sequence */
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152 0, /* tp_as_mapping */
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153 0, /* tp_hash */
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154 0, /* tp_call */
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155 0, /* tp_str */
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156 0, /* tp_getattro */
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157 0, /* tp_setattro */
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158 0, /* tp_as_buffer */
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159 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
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160 DecompressionObj__doc__, /* tp_doc */
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161 0, /* tp_traverse */
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162 0, /* tp_clear */
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163 0, /* tp_richcompare */
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164 0, /* tp_weaklistoffset */
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165 0, /* tp_iter */
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166 0, /* tp_iternext */
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167 DecompressionObj_methods, /* tp_methods */
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168 0, /* tp_members */
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169 0, /* tp_getset */
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170 0, /* tp_base */
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171 0, /* tp_dict */
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172 0, /* tp_descr_get */
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173 0, /* tp_descr_set */
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174 0, /* tp_dictoffset */
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175 0, /* tp_init */
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176 0, /* tp_alloc */
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177 PyType_GenericNew, /* tp_new */
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178 };
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179
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180 void decompressobj_module_init(PyObject* module) {
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181 Py_TYPE(&ZstdDecompressionObjType) = &PyType_Type;
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182 if (PyType_Ready(&ZstdDecompressionObjType) < 0) {
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183 return;
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184 }
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185 }