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/**
* Copyright (c) 2017-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;
FrameParametersObject *get_frame_parameters(PyObject *self, PyObject *args,
PyObject *kwargs) {
static char *kwlist[] = {"data", NULL};
Py_buffer source;
ZSTD_frameHeader header;
FrameParametersObject *result = NULL;
size_t zresult;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:get_frame_parameters",
kwlist, &source)) {
return NULL;
}
zresult = ZSTD_getFrameHeader(&header, source.buf, source.len);
if (ZSTD_isError(zresult)) {
PyErr_Format(ZstdError, "cannot get frame parameters: %s",
ZSTD_getErrorName(zresult));
goto finally;
}
if (zresult) {
PyErr_Format(ZstdError,
"not enough data for frame parameters; need %zu bytes",
zresult);
goto finally;
}
result = PyObject_New(FrameParametersObject, FrameParametersType);
if (!result) {
goto finally;
}
result->frameContentSize = header.frameContentSize;
result->windowSize = header.windowSize;
result->dictID = header.dictID;
result->checksumFlag = header.checksumFlag ? 1 : 0;
finally:
PyBuffer_Release(&source);
return result;
}
static void FrameParameters_dealloc(PyObject *self) {
PyObject_Del(self);
}
static PyMemberDef FrameParameters_members[] = {
{"content_size", T_ULONGLONG,
offsetof(FrameParametersObject, frameContentSize), READONLY,
"frame content size"},
{"window_size", T_ULONGLONG, offsetof(FrameParametersObject, windowSize),
READONLY, "window size"},
{"dict_id", T_UINT, offsetof(FrameParametersObject, dictID), READONLY,
"dictionary ID"},
{"has_checksum", T_BOOL, offsetof(FrameParametersObject, checksumFlag),
READONLY, "checksum flag"},
{NULL}};
PyType_Slot FrameParametersSlots[] = {
{Py_tp_dealloc, FrameParameters_dealloc},
{Py_tp_members, FrameParameters_members},
{0, NULL},
};
PyType_Spec FrameParametersSpec = {
"zstd.FrameParameters",
sizeof(FrameParametersObject),
0,
Py_TPFLAGS_DEFAULT,
FrameParametersSlots,
};
PyTypeObject *FrameParametersType;
void frameparams_module_init(PyObject *mod) {
FrameParametersType = (PyTypeObject *)PyType_FromSpec(&FrameParametersSpec);
if (PyType_Ready(FrameParametersType) < 0) {
return;
}
Py_INCREF(FrameParametersType);
PyModule_AddObject(mod, "FrameParameters", (PyObject *)FrameParametersType);
}
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