Fabio Erculiani
116 lines
3.6 KiB
C
116 lines
3.6 KiB
C
/*
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* Python Bindings for LZMA
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*
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* Copyright (c) 2004-2006 by Joachim Bauch, mail@joachim-bauch.de
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* 7-Zip Copyright (C) 1999-2005 Igor Pavlov
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* LZMA SDK Copyright (C) 1999-2005 Igor Pavlov
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: pylzma_decompress_compat.c 104 2006-01-08 18:17:14Z jojo $
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*
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*/
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#include <Python.h>
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#include <7zip/LzmaCompatDecode.h>
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#include "pylzma.h"
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void free_lzma_stream(lzma_stream *stream)
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{
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if (stream->dynamicData)
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lzmafree(stream->dynamicData);
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stream->dynamicData = NULL;
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if (stream->dictionary)
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lzmafree(stream->dictionary);
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stream->dictionary = NULL;
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}
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const char doc_decompress_compat[] = \
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"decompress_compat(string) -- Decompress the data in string, returning a string containing the decompressed data.\n" \
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"decompress_compat(string, bufsize) -- Decompress the data in string using an initial output buffer of size bufsize.\n";
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PyObject *pylzma_decompress_compat(PyObject *self, PyObject *args)
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{
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char *data;
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int length, blocksize=BLOCK_SIZE;
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PyObject *result = NULL;
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lzma_stream stream;
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int res;
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char *output;
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if (!PyArg_ParseTuple(args, "s#|l", &data, &length, &blocksize))
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return NULL;
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memset(&stream, 0, sizeof(stream));
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if (!(output = (char *)malloc(blocksize)))
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{
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PyErr_NoMemory();
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goto exit;
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}
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lzmaCompatInit(&stream);
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stream.next_in = (Byte *)data;
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stream.avail_in = length;
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stream.next_out = (Byte *)output;
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stream.avail_out = blocksize;
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// decompress data
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while (1)
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{
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Py_BEGIN_ALLOW_THREADS
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res = lzmaCompatDecode(&stream);
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Py_END_ALLOW_THREADS
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if (res == LZMA_STREAM_END) {
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break;
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} else if (res == LZMA_NOT_ENOUGH_MEM) {
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// out of memory during decompression
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PyErr_NoMemory();
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goto exit;
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} else if (res == LZMA_DATA_ERROR) {
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PyErr_SetString(PyExc_ValueError, "data error during decompression");
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goto exit;
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} else if (res == LZMA_OK) {
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// check if we need to adjust the output buffer
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if (stream.avail_out == 0)
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{
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output = (char *)realloc(output, blocksize+BLOCK_SIZE);
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stream.avail_out = BLOCK_SIZE;
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stream.next_out = (Byte *)&output[blocksize];
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blocksize += BLOCK_SIZE;
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};
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} else {
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PyErr_Format(PyExc_ValueError, "unknown return code from lzmaDecode: %d", res);
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goto exit;
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}
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// if we exit here, decompression finished without returning LZMA_STREAM_END
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// XXX: why is this sometimes?
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if (stream.avail_in == 0)
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break;
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}
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result = PyString_FromStringAndSize(output, stream.totalOut);
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exit:
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free_lzma_stream(&stream);
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if (output != NULL)
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free(output);
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return result;
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}
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