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annotate contrib/python-zstandard/c-ext/decompressionwriter.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 675775c33ab6
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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 (ensure_dctx(self->decompressor, 1)) {
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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 return PyLong_FromSize_t(ZSTD_sizeof_DCtx(self->decompressor->dctx));
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48 }
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49
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50 static PyObject* ZstdDecompressionWriter_write(ZstdDecompressionWriter* self, PyObject* args, PyObject* kwargs) {
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51 static char* kwlist[] = {
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52 "data",
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53 NULL
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54 };
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55
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56 PyObject* result = NULL;
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57 Py_buffer source;
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58 size_t zresult = 0;
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59 ZSTD_inBuffer input;
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60 ZSTD_outBuffer output;
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61 PyObject* res;
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62 Py_ssize_t totalWrite = 0;
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63
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64 #if PY_MAJOR_VERSION >= 3
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65 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:write",
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66 #else
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67 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:write",
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68 #endif
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69 kwlist, &source)) {
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70 return NULL;
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71 }
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72
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73 if (!PyBuffer_IsContiguous(&source, 'C') || source.ndim > 1) {
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74 PyErr_SetString(PyExc_ValueError,
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75 "data buffer should be contiguous and have at most one dimension");
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76 goto finally;
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77 }
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78
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79 if (!self->entered) {
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80 PyErr_SetString(ZstdError, "write must be called from an active context manager");
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81 goto finally;
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82 }
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83
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84 output.dst = PyMem_Malloc(self->outSize);
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85 if (!output.dst) {
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86 PyErr_NoMemory();
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87 goto finally;
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88 }
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89 output.size = self->outSize;
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90 output.pos = 0;
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91
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92 input.src = source.buf;
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93 input.size = source.len;
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94 input.pos = 0;
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95
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96 while ((ssize_t)input.pos < source.len) {
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97 Py_BEGIN_ALLOW_THREADS
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98 zresult = ZSTD_decompress_generic(self->decompressor->dctx, &output, &input);
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99 Py_END_ALLOW_THREADS
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100
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101 if (ZSTD_isError(zresult)) {
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102 PyMem_Free(output.dst);
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103 PyErr_Format(ZstdError, "zstd decompress error: %s",
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104 ZSTD_getErrorName(zresult));
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105 goto finally;
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106 }
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107
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108 if (output.pos) {
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109 #if PY_MAJOR_VERSION >= 3
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110 res = PyObject_CallMethod(self->writer, "write", "y#",
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111 #else
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112 res = PyObject_CallMethod(self->writer, "write", "s#",
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113 #endif
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114 output.dst, output.pos);
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115 Py_XDECREF(res);
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116 totalWrite += output.pos;
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117 output.pos = 0;
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118 }
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119 }
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120
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121 PyMem_Free(output.dst);
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122
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123 result = PyLong_FromSsize_t(totalWrite);
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124
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125 finally:
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126 PyBuffer_Release(&source);
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127 return result;
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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 | METH_KEYWORDS,
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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 }