Mercurial > hg
annotate contrib/python-zstandard/c-ext/compressionwriter.c @ 31796:e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Commit 81e1f5bbf1fc54808649562d3ed829730765c540 from
https://github.com/indygreg/python-zstandard is imported without
modifications (other than removing unwanted files).
Updates relevant to Mercurial include:
* Support for multi-threaded compression (we can use this for
bundle and wire protocol compression).
* APIs for batch compression and decompression operations using
multiple threads and optimal memory allocation mechanism. (Can
be useful for revlog perf improvements.)
* A ``BufferWithSegments`` type that models a single memory buffer
containing N discrete items of known lengths. This type can be
used for very efficient 0-copy data operations.
# no-check-commit
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 01 Apr 2017 15:24:03 -0700 |
parents | c32454d69b85 |
children | b1fb341d8a61 |
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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(ZstdCompresssionWriter__doc__, |
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14 """A context manager used for writing compressed output to a writer.\n" |
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15 ); |
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16 |
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17 static void ZstdCompressionWriter_dealloc(ZstdCompressionWriter* self) { |
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18 Py_XDECREF(self->compressor); |
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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* ZstdCompressionWriter_enter(ZstdCompressionWriter* 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 (self->compressor->mtcctx) { |
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31 if (init_mtcstream(self->compressor, self->sourceSize)) { |
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32 return NULL; |
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33 } |
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34 } |
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35 else { |
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36 if (0 != init_cstream(self->compressor, self->sourceSize)) { |
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37 return NULL; |
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38 } |
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39 } |
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40 |
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41 self->entered = 1; |
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42 |
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43 Py_INCREF(self); |
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44 return (PyObject*)self; |
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45 } |
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46 |
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47 static PyObject* ZstdCompressionWriter_exit(ZstdCompressionWriter* self, PyObject* args) { |
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48 PyObject* exc_type; |
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49 PyObject* exc_value; |
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50 PyObject* exc_tb; |
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51 size_t zresult; |
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52 |
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53 ZSTD_outBuffer output; |
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54 PyObject* res; |
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55 |
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56 if (!PyArg_ParseTuple(args, "OOO:__exit__", &exc_type, &exc_value, &exc_tb)) { |
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57 return NULL; |
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58 } |
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59 |
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60 self->entered = 0; |
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61 |
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62 if ((self->compressor->cstream || self->compressor->mtcctx) && exc_type == Py_None |
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63 && exc_value == Py_None && exc_tb == Py_None) { |
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64 |
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65 output.dst = PyMem_Malloc(self->outSize); |
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66 if (!output.dst) { |
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67 return PyErr_NoMemory(); |
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68 } |
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69 output.size = self->outSize; |
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70 output.pos = 0; |
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71 |
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72 while (1) { |
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73 if (self->compressor->mtcctx) { |
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74 zresult = ZSTDMT_endStream(self->compressor->mtcctx, &output); |
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75 } |
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76 else { |
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77 zresult = ZSTD_endStream(self->compressor->cstream, &output); |
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78 } |
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79 if (ZSTD_isError(zresult)) { |
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80 PyErr_Format(ZstdError, "error ending compression stream: %s", |
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81 ZSTD_getErrorName(zresult)); |
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82 PyMem_Free(output.dst); |
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83 return NULL; |
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84 } |
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85 |
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86 if (output.pos) { |
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87 #if PY_MAJOR_VERSION >= 3 |
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88 res = PyObject_CallMethod(self->writer, "write", "y#", |
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89 #else |
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90 res = PyObject_CallMethod(self->writer, "write", "s#", |
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91 #endif |
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92 output.dst, output.pos); |
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93 Py_XDECREF(res); |
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94 } |
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95 |
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96 if (!zresult) { |
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97 break; |
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98 } |
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99 |
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100 output.pos = 0; |
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101 } |
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102 |
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103 PyMem_Free(output.dst); |
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104 } |
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105 |
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106 Py_RETURN_FALSE; |
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107 } |
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108 |
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109 static PyObject* ZstdCompressionWriter_memory_size(ZstdCompressionWriter* self) { |
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110 if (!self->compressor->cstream) { |
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111 PyErr_SetString(ZstdError, "cannot determine size of an inactive compressor; " |
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112 "call when a context manager is active"); |
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113 return NULL; |
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114 } |
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115 |
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116 return PyLong_FromSize_t(ZSTD_sizeof_CStream(self->compressor->cstream)); |
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117 } |
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118 |
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119 static PyObject* ZstdCompressionWriter_write(ZstdCompressionWriter* self, PyObject* args) { |
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120 const char* source; |
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121 Py_ssize_t sourceSize; |
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122 size_t zresult; |
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123 ZSTD_inBuffer input; |
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124 ZSTD_outBuffer output; |
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125 PyObject* res; |
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126 Py_ssize_t totalWrite = 0; |
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127 |
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128 #if PY_MAJOR_VERSION >= 3 |
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129 if (!PyArg_ParseTuple(args, "y#:write", &source, &sourceSize)) { |
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130 #else |
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131 if (!PyArg_ParseTuple(args, "s#:write", &source, &sourceSize)) { |
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132 #endif |
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133 return NULL; |
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134 } |
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135 |
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136 if (!self->entered) { |
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137 PyErr_SetString(ZstdError, "compress must be called from an active context manager"); |
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138 return NULL; |
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139 } |
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140 |
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141 output.dst = PyMem_Malloc(self->outSize); |
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142 if (!output.dst) { |
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143 return PyErr_NoMemory(); |
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144 } |
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145 output.size = self->outSize; |
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146 output.pos = 0; |
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147 |
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148 input.src = source; |
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149 input.size = sourceSize; |
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150 input.pos = 0; |
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151 |
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152 while ((ssize_t)input.pos < sourceSize) { |
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153 Py_BEGIN_ALLOW_THREADS |
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154 if (self->compressor->mtcctx) { |
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155 zresult = ZSTDMT_compressStream(self->compressor->mtcctx, |
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156 &output, &input); |
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157 } |
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158 else { |
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159 zresult = ZSTD_compressStream(self->compressor->cstream, &output, &input); |
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160 } |
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161 Py_END_ALLOW_THREADS |
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162 |
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163 if (ZSTD_isError(zresult)) { |
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164 PyMem_Free(output.dst); |
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165 PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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166 return NULL; |
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167 } |
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168 |
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169 /* Copy data from output buffer to writer. */ |
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170 if (output.pos) { |
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171 #if PY_MAJOR_VERSION >= 3 |
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172 res = PyObject_CallMethod(self->writer, "write", "y#", |
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173 #else |
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174 res = PyObject_CallMethod(self->writer, "write", "s#", |
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175 #endif |
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176 output.dst, output.pos); |
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177 Py_XDECREF(res); |
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178 totalWrite += output.pos; |
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179 } |
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180 output.pos = 0; |
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181 } |
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182 |
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183 PyMem_Free(output.dst); |
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184 |
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185 return PyLong_FromSsize_t(totalWrite); |
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186 } |
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187 |
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188 static PyObject* ZstdCompressionWriter_flush(ZstdCompressionWriter* self, PyObject* args) { |
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189 size_t zresult; |
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190 ZSTD_outBuffer output; |
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191 PyObject* res; |
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192 Py_ssize_t totalWrite = 0; |
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193 |
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194 if (!self->entered) { |
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195 PyErr_SetString(ZstdError, "flush must be called from an active context manager"); |
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196 return NULL; |
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197 } |
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198 |
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199 output.dst = PyMem_Malloc(self->outSize); |
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200 if (!output.dst) { |
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201 return PyErr_NoMemory(); |
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202 } |
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203 output.size = self->outSize; |
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204 output.pos = 0; |
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205 |
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206 while (1) { |
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|
207 Py_BEGIN_ALLOW_THREADS |
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208 if (self->compressor->mtcctx) { |
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209 zresult = ZSTDMT_flushStream(self->compressor->mtcctx, &output); |
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210 } |
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211 else { |
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212 zresult = ZSTD_flushStream(self->compressor->cstream, &output); |
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213 } |
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214 Py_END_ALLOW_THREADS |
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215 |
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|
216 if (ZSTD_isError(zresult)) { |
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217 PyMem_Free(output.dst); |
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218 PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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219 return NULL; |
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220 } |
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221 |
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222 if (!output.pos) { |
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223 break; |
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224 } |
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225 |
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|
226 /* Copy data from output buffer to writer. */ |
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227 if (output.pos) { |
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228 #if PY_MAJOR_VERSION >= 3 |
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229 res = PyObject_CallMethod(self->writer, "write", "y#", |
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230 #else |
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231 res = PyObject_CallMethod(self->writer, "write", "s#", |
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232 #endif |
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233 output.dst, output.pos); |
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234 Py_XDECREF(res); |
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235 totalWrite += output.pos; |
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236 } |
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237 output.pos = 0; |
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238 } |
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239 |
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240 PyMem_Free(output.dst); |
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241 |
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242 return PyLong_FromSsize_t(totalWrite); |
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243 } |
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244 |
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245 static PyMethodDef ZstdCompressionWriter_methods[] = { |
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246 { "__enter__", (PyCFunction)ZstdCompressionWriter_enter, METH_NOARGS, |
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247 PyDoc_STR("Enter a compression context.") }, |
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248 { "__exit__", (PyCFunction)ZstdCompressionWriter_exit, METH_VARARGS, |
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249 PyDoc_STR("Exit a compression context.") }, |
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250 { "memory_size", (PyCFunction)ZstdCompressionWriter_memory_size, METH_NOARGS, |
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251 PyDoc_STR("Obtain the memory size of the underlying compressor") }, |
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252 { "write", (PyCFunction)ZstdCompressionWriter_write, METH_VARARGS, |
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253 PyDoc_STR("Compress data") }, |
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254 { "flush", (PyCFunction)ZstdCompressionWriter_flush, METH_NOARGS, |
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255 PyDoc_STR("Flush data and finish a zstd frame") }, |
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256 { NULL, NULL } |
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257 }; |
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258 |
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259 PyTypeObject ZstdCompressionWriterType = { |
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260 PyVarObject_HEAD_INIT(NULL, 0) |
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261 "zstd.ZstdCompressionWriter", /* tp_name */ |
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262 sizeof(ZstdCompressionWriter), /* tp_basicsize */ |
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263 0, /* tp_itemsize */ |
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264 (destructor)ZstdCompressionWriter_dealloc, /* tp_dealloc */ |
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265 0, /* tp_print */ |
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266 0, /* tp_getattr */ |
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267 0, /* tp_setattr */ |
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268 0, /* tp_compare */ |
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269 0, /* tp_repr */ |
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270 0, /* tp_as_number */ |
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271 0, /* tp_as_sequence */ |
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272 0, /* tp_as_mapping */ |
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273 0, /* tp_hash */ |
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274 0, /* tp_call */ |
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275 0, /* tp_str */ |
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276 0, /* tp_getattro */ |
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277 0, /* tp_setattro */ |
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278 0, /* tp_as_buffer */ |
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279 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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280 ZstdCompresssionWriter__doc__, /* tp_doc */ |
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281 0, /* tp_traverse */ |
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282 0, /* tp_clear */ |
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283 0, /* tp_richcompare */ |
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284 0, /* tp_weaklistoffset */ |
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285 0, /* tp_iter */ |
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286 0, /* tp_iternext */ |
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287 ZstdCompressionWriter_methods, /* tp_methods */ |
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288 0, /* tp_members */ |
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289 0, /* tp_getset */ |
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290 0, /* tp_base */ |
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291 0, /* tp_dict */ |
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292 0, /* tp_descr_get */ |
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293 0, /* tp_descr_set */ |
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294 0, /* tp_dictoffset */ |
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295 0, /* tp_init */ |
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296 0, /* tp_alloc */ |
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297 PyType_GenericNew, /* tp_new */ |
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298 }; |
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299 |
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300 void compressionwriter_module_init(PyObject* mod) { |
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301 Py_TYPE(&ZstdCompressionWriterType) = &PyType_Type; |
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302 if (PyType_Ready(&ZstdCompressionWriterType) < 0) { |
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303 return; |
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304 } |
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305 } |