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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(ZstdCompressionObj__doc__,
"Perform compression using a standard library compatible API.\n"
);
static void ZstdCompressionObj_dealloc(ZstdCompressionObj* self) {
PyMem_Free(self->output.dst);
self->output.dst = NULL;
Py_XDECREF(self->compressor);
PyObject_Del(self);
}
static PyObject* ZstdCompressionObj_compress(ZstdCompressionObj* self, PyObject* args, PyObject* kwargs) {
static char* kwlist[] = {
"data",
NULL
};
Py_buffer source;
ZSTD_inBuffer input;
size_t zresult;
PyObject* result = NULL;
Py_ssize_t resultSize = 0;
if (self->finished) {
PyErr_SetString(ZstdError, "cannot call compress() after compressor finished");
return NULL;
}
#if PY_MAJOR_VERSION >= 3
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:compress",
#else
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:compress",
#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;
}
input.src = source.buf;
input.size = source.len;
input.pos = 0;
while (input.pos < (size_t)source.len) {
Py_BEGIN_ALLOW_THREADS
zresult = ZSTD_compressStream2(self->compressor->cctx, &self->output,
&input, ZSTD_e_continue);
Py_END_ALLOW_THREADS
if (ZSTD_isError(zresult)) {
PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult));
Py_CLEAR(result);
goto finally;
}
if (self->output.pos) {
if (result) {
resultSize = PyBytes_GET_SIZE(result);
if (safe_pybytes_resize(&result, resultSize + self->output.pos)) {
Py_CLEAR(result);
goto finally;
}
memcpy(PyBytes_AS_STRING(result) + resultSize,
self->output.dst, self->output.pos);
}
else {
result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos);
if (!result) {
goto finally;
}
}
self->output.pos = 0;
}
}
if (NULL == result) {
result = PyBytes_FromString("");
}
finally:
PyBuffer_Release(&source);
return result;
}
static PyObject* ZstdCompressionObj_flush(ZstdCompressionObj* self, PyObject* args, PyObject* kwargs) {
static char* kwlist[] = {
"flush_mode",
NULL
};
int flushMode = compressorobj_flush_finish;
size_t zresult;
PyObject* result = NULL;
Py_ssize_t resultSize = 0;
ZSTD_inBuffer input;
ZSTD_EndDirective zFlushMode;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i:flush", kwlist, &flushMode)) {
return NULL;
}
if (flushMode != compressorobj_flush_finish && flushMode != compressorobj_flush_block) {
PyErr_SetString(PyExc_ValueError, "flush mode not recognized");
return NULL;
}
if (self->finished) {
PyErr_SetString(ZstdError, "compressor object already finished");
return NULL;
}
switch (flushMode) {
case compressorobj_flush_block:
zFlushMode = ZSTD_e_flush;
break;
case compressorobj_flush_finish:
zFlushMode = ZSTD_e_end;
self->finished = 1;
break;
default:
PyErr_SetString(ZstdError, "unhandled flush mode");
return NULL;
}
assert(self->output.pos == 0);
input.src = NULL;
input.size = 0;
input.pos = 0;
while (1) {
Py_BEGIN_ALLOW_THREADS
zresult = ZSTD_compressStream2(self->compressor->cctx, &self->output,
&input, zFlushMode);
Py_END_ALLOW_THREADS
if (ZSTD_isError(zresult)) {
PyErr_Format(ZstdError, "error ending compression stream: %s",
ZSTD_getErrorName(zresult));
return NULL;
}
if (self->output.pos) {
if (result) {
resultSize = PyBytes_GET_SIZE(result);
if (safe_pybytes_resize(&result, resultSize + self->output.pos)) {
Py_XDECREF(result);
return NULL;
}
memcpy(PyBytes_AS_STRING(result) + resultSize,
self->output.dst, self->output.pos);
}
else {
result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos);
if (!result) {
return NULL;
}
}
self->output.pos = 0;
}
if (!zresult) {
break;
}
}
if (result) {
return result;
}
else {
return PyBytes_FromString("");
}
}
static PyMethodDef ZstdCompressionObj_methods[] = {
{ "compress", (PyCFunction)ZstdCompressionObj_compress, METH_VARARGS | METH_KEYWORDS,
PyDoc_STR("compress data") },
{ "flush", (PyCFunction)ZstdCompressionObj_flush, METH_VARARGS | METH_KEYWORDS,
PyDoc_STR("finish compression operation") },
{ NULL, NULL }
};
PyTypeObject ZstdCompressionObjType = {
PyVarObject_HEAD_INIT(NULL, 0)
"zstd.ZstdCompressionObj", /* tp_name */
sizeof(ZstdCompressionObj), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)ZstdCompressionObj_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 */
ZstdCompressionObj__doc__, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
ZstdCompressionObj_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 compressobj_module_init(PyObject* module) {
Py_TYPE(&ZstdCompressionObjType) = &PyType_Type;
if (PyType_Ready(&ZstdCompressionObjType) < 0) {
return;
}
}
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