Mercurial > public > mercurial-scm > hg
annotate contrib/python-zstandard/c-ext/decompressoriterator.c @ 42070:675775c33ab6
zstandard: vendor python-zstandard 0.11
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.
The project contains a vendored copy of zstandard 1.3.8. The old
version was 1.3.6. This should result in some minor performance wins.
test-check-py3-compat.t was updated to reflect now-passing tests on
Python 3.8.
Some HTTP tests were updated to reflect new zstd compression output.
# no-check-commit because 3rd party code has different style guidelines
Differential Revision: https://phab.mercurial-scm.org/D6199
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 04 Apr 2019 17:34:43 -0700 |
parents | 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 #define min(a, b) (((a) < (b)) ? (a) : (b)) |
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12 |
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13 extern PyObject* ZstdError; |
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14 |
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15 PyDoc_STRVAR(ZstdDecompressorIterator__doc__, |
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16 "Represents an iterator of decompressed data.\n" |
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17 ); |
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18 |
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19 static void ZstdDecompressorIterator_dealloc(ZstdDecompressorIterator* self) { |
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20 Py_XDECREF(self->decompressor); |
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21 Py_XDECREF(self->reader); |
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22 |
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23 if (self->buffer.buf) { |
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24 PyBuffer_Release(&self->buffer); |
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25 memset(&self->buffer, 0, sizeof(self->buffer)); |
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26 } |
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27 |
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28 if (self->input.src) { |
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29 PyMem_Free((void*)self->input.src); |
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30 self->input.src = NULL; |
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31 } |
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32 |
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33 PyObject_Del(self); |
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34 } |
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35 |
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36 static PyObject* ZstdDecompressorIterator_iter(PyObject* self) { |
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37 Py_INCREF(self); |
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38 return self; |
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39 } |
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40 |
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41 static DecompressorIteratorResult read_decompressor_iterator(ZstdDecompressorIterator* self) { |
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42 size_t zresult; |
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43 PyObject* chunk; |
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44 DecompressorIteratorResult result; |
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45 size_t oldInputPos = self->input.pos; |
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46 |
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47 result.chunk = NULL; |
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48 |
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49 chunk = PyBytes_FromStringAndSize(NULL, self->outSize); |
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50 if (!chunk) { |
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51 result.errored = 1; |
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52 return result; |
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53 } |
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54 |
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55 self->output.dst = PyBytes_AsString(chunk); |
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56 self->output.size = self->outSize; |
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57 self->output.pos = 0; |
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58 |
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59 Py_BEGIN_ALLOW_THREADS |
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60 zresult = ZSTD_decompressStream(self->decompressor->dctx, &self->output, &self->input); |
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61 Py_END_ALLOW_THREADS |
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62 |
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63 /* We're done with the pointer. Nullify to prevent anyone from getting a |
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64 handle on a Python object. */ |
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65 self->output.dst = NULL; |
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66 |
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67 if (ZSTD_isError(zresult)) { |
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68 Py_DECREF(chunk); |
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69 PyErr_Format(ZstdError, "zstd decompress error: %s", |
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70 ZSTD_getErrorName(zresult)); |
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71 result.errored = 1; |
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72 return result; |
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73 } |
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74 |
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75 self->readCount += self->input.pos - oldInputPos; |
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76 |
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77 /* Frame is fully decoded. Input exhausted and output sitting in buffer. */ |
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78 if (0 == zresult) { |
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79 self->finishedInput = 1; |
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80 self->finishedOutput = 1; |
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81 } |
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82 |
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83 /* If it produced output data, return it. */ |
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84 if (self->output.pos) { |
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85 if (self->output.pos < self->outSize) { |
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86 if (safe_pybytes_resize(&chunk, self->output.pos)) { |
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87 Py_XDECREF(chunk); |
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88 result.errored = 1; |
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89 return result; |
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90 } |
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91 } |
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92 } |
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93 else { |
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94 Py_DECREF(chunk); |
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95 chunk = NULL; |
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96 } |
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97 |
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98 result.errored = 0; |
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99 result.chunk = chunk; |
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100 |
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101 return result; |
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102 } |
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103 |
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104 static PyObject* ZstdDecompressorIterator_iternext(ZstdDecompressorIterator* self) { |
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105 PyObject* readResult = NULL; |
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106 char* readBuffer; |
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107 Py_ssize_t readSize; |
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108 Py_ssize_t bufferRemaining; |
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109 DecompressorIteratorResult result; |
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110 |
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111 if (self->finishedOutput) { |
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112 PyErr_SetString(PyExc_StopIteration, "output flushed"); |
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113 return NULL; |
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114 } |
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115 |
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116 /* If we have data left in the input, consume it. */ |
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117 if (self->input.pos < self->input.size) { |
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118 result = read_decompressor_iterator(self); |
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119 if (result.chunk || result.errored) { |
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120 return result.chunk; |
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121 } |
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122 |
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123 /* Else fall through to get more data from input. */ |
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124 } |
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125 |
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126 read_from_source: |
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127 |
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128 if (!self->finishedInput) { |
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129 if (self->reader) { |
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130 readResult = PyObject_CallMethod(self->reader, "read", "I", self->inSize); |
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131 if (!readResult) { |
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132 return NULL; |
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133 } |
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134 |
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135 PyBytes_AsStringAndSize(readResult, &readBuffer, &readSize); |
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Gregory Szorc <gregory.szorc@gmail.com>
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136 } |
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137 else { |
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138 assert(self->buffer.buf); |
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139 |
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140 /* Only support contiguous C arrays for now */ |
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141 assert(self->buffer.strides == NULL && self->buffer.suboffsets == NULL); |
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142 assert(self->buffer.itemsize == 1); |
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143 |
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144 /* TODO avoid memcpy() below */ |
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145 readBuffer = (char *)self->buffer.buf + self->bufferOffset; |
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146 bufferRemaining = self->buffer.len - self->bufferOffset; |
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147 readSize = min(bufferRemaining, (Py_ssize_t)self->inSize); |
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148 self->bufferOffset += readSize; |
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149 } |
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150 |
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151 if (readSize) { |
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152 if (!self->readCount && self->skipBytes) { |
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153 assert(self->skipBytes < self->inSize); |
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154 if ((Py_ssize_t)self->skipBytes >= readSize) { |
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155 PyErr_SetString(PyExc_ValueError, |
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156 "skip_bytes larger than first input chunk; " |
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157 "this scenario is currently unsupported"); |
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158 Py_XDECREF(readResult); |
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159 return NULL; |
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|
160 } |
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161 |
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162 readBuffer = readBuffer + self->skipBytes; |
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163 readSize -= self->skipBytes; |
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|
164 } |
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165 |
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166 /* Copy input into previously allocated buffer because it can live longer |
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|
167 than a single function call and we don't want to keep a ref to a Python |
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168 object around. This could be changed... */ |
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|
169 memcpy((void*)self->input.src, readBuffer, readSize); |
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170 self->input.size = readSize; |
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171 self->input.pos = 0; |
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172 } |
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|
173 /* No bytes on first read must mean an empty input stream. */ |
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174 else if (!self->readCount) { |
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175 self->finishedInput = 1; |
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176 self->finishedOutput = 1; |
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177 Py_XDECREF(readResult); |
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178 PyErr_SetString(PyExc_StopIteration, "empty input"); |
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179 return NULL; |
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|
180 } |
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181 else { |
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182 self->finishedInput = 1; |
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|
183 } |
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|
184 |
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|
185 /* We've copied the data managed by memory. Discard the Python object. */ |
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|
186 Py_XDECREF(readResult); |
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|
187 } |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
188 |
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|
189 result = read_decompressor_iterator(self); |
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|
190 if (result.errored || result.chunk) { |
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parents:
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|
191 return result.chunk; |
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parents:
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|
192 } |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
193 |
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parents:
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|
194 /* No new output data. Try again unless we know there is no more data. */ |
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|
195 if (!self->finishedInput) { |
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|
196 goto read_from_source; |
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parents:
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|
197 } |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
198 |
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parents:
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|
199 PyErr_SetString(PyExc_StopIteration, "input exhausted"); |
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|
200 return NULL; |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
201 } |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
202 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
203 PyTypeObject ZstdDecompressorIteratorType = { |
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parents:
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|
204 PyVarObject_HEAD_INIT(NULL, 0) |
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parents:
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|
205 "zstd.ZstdDecompressorIterator", /* tp_name */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
206 sizeof(ZstdDecompressorIterator), /* tp_basicsize */ |
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parents:
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|
207 0, /* tp_itemsize */ |
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parents:
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|
208 (destructor)ZstdDecompressorIterator_dealloc, /* tp_dealloc */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
209 0, /* tp_print */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
210 0, /* tp_getattr */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
211 0, /* tp_setattr */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
212 0, /* tp_compare */ |
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parents:
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|
213 0, /* tp_repr */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
214 0, /* tp_as_number */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
215 0, /* tp_as_sequence */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
216 0, /* tp_as_mapping */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
217 0, /* tp_hash */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
218 0, /* tp_call */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
219 0, /* tp_str */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
220 0, /* tp_getattro */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
221 0, /* tp_setattro */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
222 0, /* tp_as_buffer */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
223 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
224 ZstdDecompressorIterator__doc__, /* tp_doc */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
225 0, /* tp_traverse */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
226 0, /* tp_clear */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
227 0, /* tp_richcompare */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
228 0, /* tp_weaklistoffset */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
229 ZstdDecompressorIterator_iter, /* tp_iter */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
230 (iternextfunc)ZstdDecompressorIterator_iternext, /* tp_iternext */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
231 0, /* tp_methods */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
232 0, /* tp_members */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
233 0, /* tp_getset */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
234 0, /* tp_base */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
235 0, /* tp_dict */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
236 0, /* tp_descr_get */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
237 0, /* tp_descr_set */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
238 0, /* tp_dictoffset */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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239 0, /* tp_init */ |
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240 0, /* tp_alloc */ |
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241 PyType_GenericNew, /* tp_new */ |
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242 }; |
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243 |
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244 void decompressoriterator_module_init(PyObject* mod) { |
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245 Py_TYPE(&ZstdDecompressorIteratorType) = &PyType_Type; |
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246 if (PyType_Ready(&ZstdDecompressorIteratorType) < 0) { |
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247 return; |
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248 } |
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249 } |