static int
pylzma_compfile_init(CCompressionFileObject *self, PyObject *args, PyObject *kwargs)
{
PyObject *inFile;
CLzmaEncProps props;
Byte header[LZMA_PROPS_SIZE];
size_t headerSize = LZMA_PROPS_SIZE;
int result = -1;
// possible keywords for this function
static char *kwlist[] = {"infile", "dictionary", "fastBytes", "literalContextBits",
"literalPosBits", "posBits", "algorithm", "eos", "multithreading", "matchfinder", NULL};
int dictionary = 23; // [0,28], default 23 (8MB)
int fastBytes = 128; // [5,255], default 128
int literalContextBits = 3; // [0,8], default 3
int literalPosBits = 0; // [0,4], default 0
int posBits = 2; // [0,4], default 2
int eos = 1; // write "end of stream" marker?
int multithreading = 1; // use multithreading if available?
char *matchfinder = NULL; // matchfinder algorithm
int algorithm = 2;
int res;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|iiiiiiiis", kwlist, &inFile, &dictionary, &fastBytes,
&literalContextBits, &literalPosBits, &posBits, &algorithm, &eos, &multithreading, &matchfinder))
return -1;
CHECK_RANGE(dictionary, 0, 28, "dictionary must be between 0 and 28");
CHECK_RANGE(fastBytes, 5, 255, "fastBytes must be between 5 and 255");
CHECK_RANGE(literalContextBits, 0, 8, "literalContextBits must be between 0 and 8");
CHECK_RANGE(literalPosBits, 0, 4, "literalPosBits must be between 0 and 4");
CHECK_RANGE(posBits, 0, 4, "posBits must be between 0 and 4");
CHECK_RANGE(algorithm, 0, 2, "algorithm must be between 0 and 2");
if (matchfinder != NULL) {
#if (PY_VERSION_HEX >= 0x02050000)
PyErr_WarnEx(PyExc_DeprecationWarning, "matchfinder selection is deprecated and will be ignored", 1);
#else
PyErr_Warn(PyExc_DeprecationWarning, "matchfinder selection is deprecated and will be ignored");
#endif
}
if (PyString_Check(inFile)) {
// create new cStringIO object from string
inFile = PycStringIO->NewInput(inFile);
if (inFile == NULL)
{
PyErr_NoMemory();
return -1;
}
} else if (!PyObject_HasAttrString(inFile, "read")) {
PyErr_SetString(PyExc_ValueError, "first parameter must be a file-like object");
return -1;
} else {
// protect object from being refcounted out...
Py_INCREF(inFile);
}
self->encoder = LzmaEnc_Create(&allocator);
if (self->encoder == NULL) {
Py_DECREF(inFile);
PyErr_NoMemory();
return -1;
}
LzmaEncProps_Init(&props);
props.dictSize = 1 << dictionary;
props.lc = literalContextBits;
props.lp = literalPosBits;
props.pb = posBits;
props.algo = algorithm;
props.fb = fastBytes;
// props.btMode = 1;
// props.numHashBytes = 4;
// props.mc = 32;
props.writeEndMark = eos ? 1 : 0;
props.numThreads = multithreading ? 2 : 1;
LzmaEncProps_Normalize(&props);
res = LzmaEnc_SetProps(self->encoder, &props);
if (res != SZ_OK) {
Py_DECREF(inFile);
PyErr_Format(PyExc_TypeError, "could not set encoder properties: %d", res);
return -1;
}
self->inFile = inFile;
CreatePythonInStream(&self->inStream, inFile);
CreateMemoryOutStream(&self->outStream);
LzmaEnc_WriteProperties(self->encoder, header, &headerSize);
if (self->outStream.s.Write(&self->outStream, header, headerSize) != headerSize) {
PyErr_SetString(PyExc_TypeError, "could not generate stream header");
goto exit;
}
LzmaEnc_Prepare(self->encoder, &self->inStream.s, &self->outStream.s, &allocator, &allocator);
result = 0;
exit:
return result;
}
PyObject *
pylzma_compress(PyObject *self, PyObject *args, PyObject *kwargs)
{
PyObject *result = NULL;
CLzmaEncProps props;
CLzmaEncHandle encoder=NULL;
CMemoryOutStream outStream;
CMemoryInStream inStream;
Byte header[LZMA_PROPS_SIZE];
size_t headerSize = LZMA_PROPS_SIZE;
int res;
// possible keywords for this function
static char *kwlist[] = {"data", "dictionary", "fastBytes", "literalContextBits",
"literalPosBits", "posBits", "algorithm", "eos", "multithreading", "matchfinder", NULL};
int dictionary = 23; // [0,27], default 23 (8MB)
int fastBytes = 128; // [5,273], default 128
int literalContextBits = 3; // [0,8], default 3
int literalPosBits = 0; // [0,4], default 0
int posBits = 2; // [0,4], default 2
int eos = 1; // write "end of stream" marker?
int multithreading = 1; // use multithreading if available?
char *matchfinder = NULL; // matchfinder algorithm
int algorithm = 2;
char *data;
int length;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|iiiiiiiis", kwlist, &data, &length, &dictionary, &fastBytes,
&literalContextBits, &literalPosBits, &posBits, &algorithm, &eos, &multithreading, &matchfinder))
return NULL;
outStream.data = NULL;
CHECK_RANGE(dictionary, 0, 27, "dictionary must be between 0 and 27");
CHECK_RANGE(fastBytes, 5, 273, "fastBytes must be between 5 and 273");
CHECK_RANGE(literalContextBits, 0, 8, "literalContextBits must be between 0 and 8");
CHECK_RANGE(literalPosBits, 0, 4, "literalPosBits must be between 0 and 4");
CHECK_RANGE(posBits, 0, 4, "posBits must be between 0 and 4");
CHECK_RANGE(algorithm, 0, 2, "algorithm must be between 0 and 2");
if (matchfinder != NULL) {
#if (PY_VERSION_HEX >= 0x02050000)
PyErr_WarnEx(PyExc_DeprecationWarning, "matchfinder selection is deprecated and will be ignored", 1);
#else
PyErr_Warn(PyExc_DeprecationWarning, "matchfinder selection is deprecated and will be ignored");
#endif
}
encoder = LzmaEnc_Create(&allocator);
if (encoder == NULL)
return PyErr_NoMemory();
CreateMemoryInStream(&inStream, (Byte *) data, length);
CreateMemoryOutStream(&outStream);
LzmaEncProps_Init(&props);
props.dictSize = 1 << dictionary;
props.lc = literalContextBits;
props.lp = literalPosBits;
props.pb = posBits;
props.algo = algorithm;
props.fb = fastBytes;
// props.btMode = 1;
// props.numHashBytes = 4;
// props.mc = 32;
props.writeEndMark = eos ? 1 : 0;
props.numThreads = multithreading ? 2 : 1;
LzmaEncProps_Normalize(&props);
res = LzmaEnc_SetProps(encoder, &props);
if (res != SZ_OK) {
PyErr_Format(PyExc_TypeError, "could not set encoder properties: %d", res);
goto exit;
}
Py_BEGIN_ALLOW_THREADS
LzmaEnc_WriteProperties(encoder, header, &headerSize);
if (outStream.s.Write(&outStream, header, headerSize) != headerSize) {
res = SZ_ERROR_WRITE;
} else {
res = LzmaEnc_Encode(encoder, &outStream.s, &inStream.s, NULL, &allocator, &allocator);
}
Py_END_ALLOW_THREADS
if (res != SZ_OK) {
PyErr_Format(PyExc_TypeError, "Error during compressing: %d", res);
goto exit;
}
result = PyBytes_FromStringAndSize((const char *) outStream.data, outStream.size);
exit:
if (encoder != NULL) {
LzmaEnc_Destroy(encoder, &allocator, &allocator);
}
if (outStream.data != NULL) {
free(outStream.data);
}
return result;
}
