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/**
* 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) {
Py_XDECREF(self->decompressor);
PyObject_Del(self);
}
static PyObject* DecompressionObj_decompress(ZstdDecompressionObj* self, PyObject* args, PyObject* kwargs) {
static char* kwlist[] = {
"data",
NULL
};
Py_buffer source;
size_t zresult;
ZSTD_inBuffer input;
ZSTD_outBuffer output;
PyObject* result = NULL;
Py_ssize_t resultSize = 0;
output.dst = NULL;
if (self->finished) {
PyErr_SetString(ZstdError, "cannot use a decompressobj multiple times");
return NULL;
}
#if PY_MAJOR_VERSION >= 3
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:decompress",
#else
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:decompress",
#endif
kwlist, &source)) {
return NULL;
}
if (!PyBuffer_IsContiguous(&source, 'C') || source.ndim > 1) {
PyErr_SetString(PyExc_ValueError,
"data buffer should be contiguous and have at most one dimension");
goto finally;
}
/* Special case of empty input. Output will always be empty. */
if (source.len == 0) {
result = PyBytes_FromString("");
goto finally;
}
input.src = source.buf;
input.size = source.len;
input.pos = 0;
output.dst = PyMem_Malloc(self->outSize);
if (!output.dst) {
PyErr_NoMemory();
goto except;
}
output.size = self->outSize;
output.pos = 0;
while (1) {
Py_BEGIN_ALLOW_THREADS
zresult = ZSTD_decompressStream(self->decompressor->dctx, &output, &input);
Py_END_ALLOW_THREADS
if (ZSTD_isError(zresult)) {
PyErr_Format(ZstdError, "zstd decompressor error: %s",
ZSTD_getErrorName(zresult));
goto except;
}
if (0 == zresult) {
self->finished = 1;
}
if (output.pos) {
if (result) {
resultSize = PyBytes_GET_SIZE(result);
if (-1 == safe_pybytes_resize(&result, resultSize + output.pos)) {
Py_XDECREF(result);
goto except;
}
memcpy(PyBytes_AS_STRING(result) + resultSize,
output.dst, output.pos);
}
else {
result = PyBytes_FromStringAndSize(output.dst, output.pos);
if (!result) {
goto except;
}
}
}
if (zresult == 0 || (input.pos == input.size && output.pos == 0)) {
break;
}
output.pos = 0;
}
if (!result) {
result = PyBytes_FromString("");
}
goto finally;
except:
Py_CLEAR(result);
finally:
PyMem_Free(output.dst);
PyBuffer_Release(&source);
return result;
}
static PyObject* DecompressionObj_flush(ZstdDecompressionObj* self, PyObject* args, PyObject* kwargs) {
static char* kwlist[] = {
"length",
NULL
};
PyObject* length = NULL;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O:flush", kwlist, &length)) {
return NULL;
}
Py_RETURN_NONE;
}
static PyMethodDef DecompressionObj_methods[] = {
{ "decompress", (PyCFunction)DecompressionObj_decompress,
METH_VARARGS | METH_KEYWORDS, PyDoc_STR("decompress data") },
{ "flush", (PyCFunction)DecompressionObj_flush,
METH_VARARGS | METH_KEYWORDS, PyDoc_STR("no-op") },
{ 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;
}
}
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