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annotate contrib/python-zstandard/c-ext/decompressionwriter.c @ 30895:c32454d69b85

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zstd: vendor python-zstandard 0.7.0 Commit 3054ae3a66112970a091d3939fee32c2d0c1a23e from https://github.com/indygreg/python-zstandard is imported without modifications (other than removing unwanted files). The vendored zstd library within has been upgraded from 1.1.2 to 1.1.3. This version introduced new APIs for threads, thread pools, multi-threaded compression, and a new dictionary builder (COVER). These features are not yet used by python-zstandard (or Mercurial for that matter). However, that will likely change in the next python-zstandard release (and I think there are opportunities for Mercurial to take advantage of the multi-threaded APIs). Relevant to Mercurial, the CFFI bindings are now fully implemented. This means zstd should "just work" with PyPy (although I haven't tried). The python-zstandard test suite also runs all tests against both the C extension and CFFI bindings to ensure feature parity. There is also a "decompress_content_dict_chain()" API. This was derived from discussions with Yann Collet on list about alternate ways of encoding delta chains. The change most relevant to Mercurial is a performance enhancement in the simple decompression API to reuse a data structure across operations. This makes decompression of multiple inputs significantly faster. (This scenario occurs when reading revlog delta chains, for example.) Using python-zstandard's bench.py to measure the performance difference... On changelog chunks in the mozilla-unified repo: decompress discrete decompress() reuse zctx 1.262243 wall; 1.260000 CPU; 1.260000 user; 0.000000 sys 170.43 MB/s (best of 3) 0.949106 wall; 0.950000 CPU; 0.950000 user; 0.000000 sys 226.66 MB/s (best of 4) decompress discrete dict decompress() reuse zctx 0.692170 wall; 0.690000 CPU; 0.690000 user; 0.000000 sys 310.80 MB/s (best of 5) 0.437088 wall; 0.440000 CPU; 0.440000 user; 0.000000 sys 492.17 MB/s (best of 7) On manifest chunks in the mozilla-unified repo: decompress discrete decompress() reuse zctx 1.367284 wall; 1.370000 CPU; 1.370000 user; 0.000000 sys 274.01 MB/s (best of 3) 1.086831 wall; 1.080000 CPU; 1.080000 user; 0.000000 sys 344.72 MB/s (best of 3) decompress discrete dict decompress() reuse zctx 0.993272 wall; 0.990000 CPU; 0.990000 user; 0.000000 sys 377.19 MB/s (best of 3) 0.678651 wall; 0.680000 CPU; 0.680000 user; 0.000000 sys 552.06 MB/s (best of 5) That should make reads on zstd revlogs a bit faster ;) # no-check-commit
author Gregory Szorc <gregory.szorc@gmail.com>
date Tue, 07 Feb 2017 23:24:47 -0800
parents b54a2984cdd4
children e0dc40530c5a
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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 }