decompressobj.c
170 lines
| 4.5 KiB
| text/x-c
|
CLexer
|
r30435 | /** | ||
* Copyright (c) 2016-present, Gregory Szorc | ||||
* All rights reserved. | ||||
* | ||||
* This software may be modified and distributed under the terms | ||||
* of the BSD license. See the LICENSE file for details. | ||||
*/ | ||||
#include "python-zstandard.h" | ||||
extern PyObject* ZstdError; | ||||
PyDoc_STRVAR(DecompressionObj__doc__, | ||||
"Perform decompression using a standard library compatible API.\n" | ||||
); | ||||
static void DecompressionObj_dealloc(ZstdDecompressionObj* self) { | ||||
if (self->dstream) { | ||||
ZSTD_freeDStream(self->dstream); | ||||
self->dstream = NULL; | ||||
} | ||||
Py_XDECREF(self->decompressor); | ||||
PyObject_Del(self); | ||||
} | ||||
static PyObject* DecompressionObj_decompress(ZstdDecompressionObj* self, PyObject* args) { | ||||
const char* source; | ||||
Py_ssize_t sourceSize; | ||||
size_t zresult; | ||||
ZSTD_inBuffer input; | ||||
ZSTD_outBuffer output; | ||||
size_t outSize = ZSTD_DStreamOutSize(); | ||||
PyObject* result = NULL; | ||||
Py_ssize_t resultSize = 0; | ||||
if (self->finished) { | ||||
PyErr_SetString(ZstdError, "cannot use a decompressobj multiple times"); | ||||
return NULL; | ||||
} | ||||
#if PY_MAJOR_VERSION >= 3 | ||||
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r30895 | if (!PyArg_ParseTuple(args, "y#:decompress", | ||
|
r30435 | #else | ||
|
r30895 | if (!PyArg_ParseTuple(args, "s#:decompress", | ||
|
r30435 | #endif | ||
&source, &sourceSize)) { | ||||
return NULL; | ||||
} | ||||
input.src = source; | ||||
input.size = sourceSize; | ||||
input.pos = 0; | ||||
output.dst = PyMem_Malloc(outSize); | ||||
if (!output.dst) { | ||||
PyErr_NoMemory(); | ||||
return NULL; | ||||
} | ||||
output.size = outSize; | ||||
output.pos = 0; | ||||
/* Read input until exhausted. */ | ||||
while (input.pos < input.size) { | ||||
Py_BEGIN_ALLOW_THREADS | ||||
zresult = ZSTD_decompressStream(self->dstream, &output, &input); | ||||
Py_END_ALLOW_THREADS | ||||
if (ZSTD_isError(zresult)) { | ||||
PyErr_Format(ZstdError, "zstd decompressor error: %s", | ||||
ZSTD_getErrorName(zresult)); | ||||
result = NULL; | ||||
goto finally; | ||||
} | ||||
if (0 == zresult) { | ||||
self->finished = 1; | ||||
} | ||||
if (output.pos) { | ||||
if (result) { | ||||
resultSize = PyBytes_GET_SIZE(result); | ||||
if (-1 == _PyBytes_Resize(&result, resultSize + output.pos)) { | ||||
goto except; | ||||
} | ||||
memcpy(PyBytes_AS_STRING(result) + resultSize, | ||||
output.dst, output.pos); | ||||
} | ||||
else { | ||||
result = PyBytes_FromStringAndSize(output.dst, output.pos); | ||||
if (!result) { | ||||
goto except; | ||||
} | ||||
} | ||||
output.pos = 0; | ||||
} | ||||
} | ||||
if (!result) { | ||||
result = PyBytes_FromString(""); | ||||
} | ||||
goto finally; | ||||
except: | ||||
Py_DecRef(result); | ||||
result = NULL; | ||||
finally: | ||||
PyMem_Free(output.dst); | ||||
return result; | ||||
} | ||||
static PyMethodDef DecompressionObj_methods[] = { | ||||
{ "decompress", (PyCFunction)DecompressionObj_decompress, | ||||
METH_VARARGS, PyDoc_STR("decompress data") }, | ||||
{ NULL, NULL } | ||||
}; | ||||
PyTypeObject ZstdDecompressionObjType = { | ||||
PyVarObject_HEAD_INIT(NULL, 0) | ||||
"zstd.ZstdDecompressionObj", /* tp_name */ | ||||
sizeof(ZstdDecompressionObj), /* tp_basicsize */ | ||||
0, /* tp_itemsize */ | ||||
(destructor)DecompressionObj_dealloc, /* tp_dealloc */ | ||||
0, /* tp_print */ | ||||
0, /* tp_getattr */ | ||||
0, /* tp_setattr */ | ||||
0, /* tp_compare */ | ||||
0, /* tp_repr */ | ||||
0, /* tp_as_number */ | ||||
0, /* tp_as_sequence */ | ||||
0, /* tp_as_mapping */ | ||||
0, /* tp_hash */ | ||||
0, /* tp_call */ | ||||
0, /* tp_str */ | ||||
0, /* tp_getattro */ | ||||
0, /* tp_setattro */ | ||||
0, /* tp_as_buffer */ | ||||
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ | ||||
DecompressionObj__doc__, /* tp_doc */ | ||||
0, /* tp_traverse */ | ||||
0, /* tp_clear */ | ||||
0, /* tp_richcompare */ | ||||
0, /* tp_weaklistoffset */ | ||||
0, /* tp_iter */ | ||||
0, /* tp_iternext */ | ||||
DecompressionObj_methods, /* tp_methods */ | ||||
0, /* tp_members */ | ||||
0, /* tp_getset */ | ||||
0, /* tp_base */ | ||||
0, /* tp_dict */ | ||||
0, /* tp_descr_get */ | ||||
0, /* tp_descr_set */ | ||||
0, /* tp_dictoffset */ | ||||
0, /* tp_init */ | ||||
0, /* tp_alloc */ | ||||
PyType_GenericNew, /* tp_new */ | ||||
}; | ||||
void decompressobj_module_init(PyObject* module) { | ||||
Py_TYPE(&ZstdDecompressionObjType) = &PyType_Type; | ||||
if (PyType_Ready(&ZstdDecompressionObjType) < 0) { | ||||
return; | ||||
} | ||||
} | ||||