author | Martin von Zweigbergk <martinvonz@google.com> |
Thu, 22 Jun 2017 21:45:32 -0700 | |
changeset 33044 | 1d2b68952950 |
parent 31796 | e0dc40530c5a |
child 37495 | b1fb341d8a61 |
permissions | -rw-r--r-- |
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/** |
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* Copyright (c) 2016-present, Gregory Szorc |
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* All rights reserved. |
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* |
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* This software may be modified and distributed under the terms |
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* of the BSD license. See the LICENSE file for details. |
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*/ |
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|
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#include "python-zstandard.h" |
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|
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extern PyObject* ZstdError; |
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|
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PyDoc_STRVAR(ZstdCompresssionWriter__doc__, |
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"""A context manager used for writing compressed output to a writer.\n" |
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); |
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|
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static void ZstdCompressionWriter_dealloc(ZstdCompressionWriter* self) { |
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Py_XDECREF(self->compressor); |
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Py_XDECREF(self->writer); |
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|
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PyObject_Del(self); |
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} |
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|
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static PyObject* ZstdCompressionWriter_enter(ZstdCompressionWriter* self) { |
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if (self->entered) { |
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PyErr_SetString(ZstdError, "cannot __enter__ multiple times"); |
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return NULL; |
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} |
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|
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if (self->compressor->mtcctx) { |
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if (init_mtcstream(self->compressor, self->sourceSize)) { |
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return NULL; |
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} |
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} |
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else { |
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if (0 != init_cstream(self->compressor, self->sourceSize)) { |
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return NULL; |
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} |
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} |
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self->entered = 1; |
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|
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Py_INCREF(self); |
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return (PyObject*)self; |
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} |
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|
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static PyObject* ZstdCompressionWriter_exit(ZstdCompressionWriter* self, PyObject* args) { |
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PyObject* exc_type; |
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PyObject* exc_value; |
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PyObject* exc_tb; |
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size_t zresult; |
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|
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ZSTD_outBuffer output; |
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PyObject* res; |
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if (!PyArg_ParseTuple(args, "OOO:__exit__", &exc_type, &exc_value, &exc_tb)) { |
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return NULL; |
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} |
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|
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self->entered = 0; |
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|
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if ((self->compressor->cstream || self->compressor->mtcctx) && exc_type == Py_None |
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&& exc_value == Py_None && exc_tb == Py_None) { |
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|
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output.dst = PyMem_Malloc(self->outSize); |
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if (!output.dst) { |
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return PyErr_NoMemory(); |
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} |
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output.size = self->outSize; |
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output.pos = 0; |
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|
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while (1) { |
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if (self->compressor->mtcctx) { |
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zresult = ZSTDMT_endStream(self->compressor->mtcctx, &output); |
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} |
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else { |
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zresult = ZSTD_endStream(self->compressor->cstream, &output); |
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} |
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if (ZSTD_isError(zresult)) { |
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PyErr_Format(ZstdError, "error ending compression stream: %s", |
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ZSTD_getErrorName(zresult)); |
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PyMem_Free(output.dst); |
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return NULL; |
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} |
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|
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if (output.pos) { |
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#if PY_MAJOR_VERSION >= 3 |
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res = PyObject_CallMethod(self->writer, "write", "y#", |
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#else |
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res = PyObject_CallMethod(self->writer, "write", "s#", |
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#endif |
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output.dst, output.pos); |
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Py_XDECREF(res); |
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} |
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|
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96 |
if (!zresult) { |
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97 |
break; |
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98 |
} |
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|
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output.pos = 0; |
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101 |
} |
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102 |
|
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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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static PyObject* ZstdCompressionWriter_memory_size(ZstdCompressionWriter* self) { |
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if (!self->compressor->cstream) { |
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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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|
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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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parents:
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|
123 |
ZSTD_inBuffer input; |
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|
124 |
ZSTD_outBuffer output; |
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parents:
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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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parents:
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|
134 |
} |
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parents:
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|
135 |
|
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
136 |
if (!self->entered) { |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
137 |
PyErr_SetString(ZstdError, "compress must be called from an active context manager"); |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
138 |
return NULL; |
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parents:
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|
139 |
} |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
140 |
|
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zstd: vendor python-zstandard 0.6.0
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|
141 |
output.dst = PyMem_Malloc(self->outSize); |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
142 |
if (!output.dst) { |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
143 |
return PyErr_NoMemory(); |
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parents:
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|
144 |
} |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
145 |
output.size = self->outSize; |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
146 |
output.pos = 0; |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
147 |
|
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
148 |
input.src = source; |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
149 |
input.size = sourceSize; |
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parents:
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changeset
|
150 |
input.pos = 0; |
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parents:
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|
151 |
|
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
152 |
while ((ssize_t)input.pos < sourceSize) { |
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parents:
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|
153 |
Py_BEGIN_ALLOW_THREADS |
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|
154 |
if (self->compressor->mtcctx) { |
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parents:
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|
155 |
zresult = ZSTDMT_compressStream(self->compressor->mtcctx, |
e0dc40530c5a
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parents:
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|
156 |
&output, &input); |
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zstd: vendor python-zstandard 0.8.0
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parents:
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|
157 |
} |
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parents:
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|
158 |
else { |
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parents:
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|
159 |
zresult = ZSTD_compressStream(self->compressor->cstream, &output, &input); |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
160 |
} |
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parents:
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changeset
|
161 |
Py_END_ALLOW_THREADS |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
162 |
|
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
163 |
if (ZSTD_isError(zresult)) { |
30822
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zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
164 |
PyMem_Free(output.dst); |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
165 |
PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
166 |
return NULL; |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
167 |
} |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
168 |
|
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
169 |
/* Copy data from output buffer to writer. */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
170 |
if (output.pos) { |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
171 |
#if PY_MAJOR_VERSION >= 3 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
172 |
res = PyObject_CallMethod(self->writer, "write", "y#", |
b86a448a2965
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
173 |
#else |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
174 |
res = PyObject_CallMethod(self->writer, "write", "s#", |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
175 |
#endif |
b86a448a2965
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
176 |
output.dst, output.pos); |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
177 |
Py_XDECREF(res); |
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parents:
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changeset
|
178 |
totalWrite += output.pos; |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
179 |
} |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
180 |
output.pos = 0; |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
181 |
} |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
182 |
|
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zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
183 |
PyMem_Free(output.dst); |
30435
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
184 |
|
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
185 |
return PyLong_FromSsize_t(totalWrite); |
30822
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
186 |
} |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
187 |
|
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
188 |
static PyObject* ZstdCompressionWriter_flush(ZstdCompressionWriter* self, PyObject* args) { |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
189 |
size_t zresult; |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
190 |
ZSTD_outBuffer output; |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
191 |
PyObject* res; |
30895
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
192 |
Py_ssize_t totalWrite = 0; |
30822
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
193 |
|
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
194 |
if (!self->entered) { |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
195 |
PyErr_SetString(ZstdError, "flush must be called from an active context manager"); |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
196 |
return NULL; |
30435
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zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
197 |
} |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
198 |
|
30822
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
199 |
output.dst = PyMem_Malloc(self->outSize); |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
200 |
if (!output.dst) { |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
201 |
return PyErr_NoMemory(); |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
202 |
} |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
203 |
output.size = self->outSize; |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
204 |
output.pos = 0; |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
205 |
|
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
206 |
while (1) { |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
207 |
Py_BEGIN_ALLOW_THREADS |
31796
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
208 |
if (self->compressor->mtcctx) { |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
209 |
zresult = ZSTDMT_flushStream(self->compressor->mtcctx, &output); |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
210 |
} |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
211 |
else { |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
212 |
zresult = ZSTD_flushStream(self->compressor->cstream, &output); |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
213 |
} |
30822
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
214 |
Py_END_ALLOW_THREADS |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
215 |
|
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
216 |
if (ZSTD_isError(zresult)) { |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
217 |
PyMem_Free(output.dst); |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
218 |
PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
219 |
return NULL; |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
220 |
} |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
221 |
|
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
222 |
if (!output.pos) { |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
223 |
break; |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
224 |
} |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
225 |
|
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
226 |
/* Copy data from output buffer to writer. */ |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
227 |
if (output.pos) { |
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#if PY_MAJOR_VERSION >= 3 |
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res = PyObject_CallMethod(self->writer, "write", "y#", |
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#else |
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res = PyObject_CallMethod(self->writer, "write", "s#", |
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#endif |
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output.dst, output.pos); |
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Py_XDECREF(res); |
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totalWrite += output.pos; |
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} |
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output.pos = 0; |
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} |
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|
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PyMem_Free(output.dst); |
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|
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return PyLong_FromSsize_t(totalWrite); |
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} |
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|
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static PyMethodDef ZstdCompressionWriter_methods[] = { |
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{ "__enter__", (PyCFunction)ZstdCompressionWriter_enter, METH_NOARGS, |
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PyDoc_STR("Enter a compression context.") }, |
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{ "__exit__", (PyCFunction)ZstdCompressionWriter_exit, METH_VARARGS, |
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PyDoc_STR("Exit a compression context.") }, |
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{ "memory_size", (PyCFunction)ZstdCompressionWriter_memory_size, METH_NOARGS, |
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PyDoc_STR("Obtain the memory size of the underlying compressor") }, |
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{ "write", (PyCFunction)ZstdCompressionWriter_write, METH_VARARGS, |
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PyDoc_STR("Compress data") }, |
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{ "flush", (PyCFunction)ZstdCompressionWriter_flush, METH_NOARGS, |
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PyDoc_STR("Flush data and finish a zstd frame") }, |
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{ NULL, NULL } |
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}; |
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|
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PyTypeObject ZstdCompressionWriterType = { |
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PyVarObject_HEAD_INIT(NULL, 0) |
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"zstd.ZstdCompressionWriter", /* tp_name */ |
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sizeof(ZstdCompressionWriter), /* tp_basicsize */ |
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0, /* tp_itemsize */ |
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(destructor)ZstdCompressionWriter_dealloc, /* tp_dealloc */ |
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0, /* tp_print */ |
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0, /* tp_getattr */ |
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0, /* tp_setattr */ |
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0, /* tp_compare */ |
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0, /* tp_repr */ |
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0, /* tp_as_number */ |
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0, /* tp_as_sequence */ |
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0, /* tp_as_mapping */ |
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0, /* tp_hash */ |
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0, /* tp_call */ |
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0, /* tp_str */ |
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0, /* tp_getattro */ |
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0, /* tp_setattro */ |
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0, /* tp_as_buffer */ |
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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ZstdCompresssionWriter__doc__, /* tp_doc */ |
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0, /* tp_traverse */ |
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0, /* tp_clear */ |
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0, /* tp_richcompare */ |
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0, /* tp_weaklistoffset */ |
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0, /* tp_iter */ |
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0, /* tp_iternext */ |
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ZstdCompressionWriter_methods, /* tp_methods */ |
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0, /* tp_members */ |
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0, /* tp_getset */ |
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0, /* tp_base */ |
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0, /* tp_dict */ |
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0, /* tp_descr_get */ |
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0, /* tp_descr_set */ |
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0, /* tp_dictoffset */ |
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295 |
0, /* tp_init */ |
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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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Py_TYPE(&ZstdCompressionWriterType) = &PyType_Type; |
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if (PyType_Ready(&ZstdCompressionWriterType) < 0) { |
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303 |
return; |
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304 |
} |
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305 |
} |