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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
// Reads data from a resource file and stores the result in memory
#include "sci/include/sci_memory.h"
#include "sci/include/sciresource.h"
namespace Sci {
#define DDEBUG if (0) printf
void decryptinit3();
int decrypt3(guint8* dest, guint8* src, int length, int complength);
int decrypt4(guint8* dest, guint8* src, int length, int complength);
int decompress11(resource_t *result, Common::ReadStream &stream, int sci_version) {
guint16 compressedLength;
guint16 compressionMethod, result_size;
guint8 *buffer;
guint8 tempid;
DDEBUG("d1");
if (stream.read(&tempid, 1) != 1)
return SCI_ERROR_IO_ERROR;
result->id = tempid;
result->type = result->id & 0x7f;
if (stream.read(&(result->number), 2) != 2)
return SCI_ERROR_IO_ERROR;
#ifdef SCUMM_BIG_ENDIAN
result->number = GUINT16_SWAP_LE_BE_CONSTANT(result->number);
#endif
if ((result->type > sci_invalid_resource))
return SCI_ERROR_DECOMPRESSION_INSANE;
if ((stream.read(&compressedLength, 2) != 2) || (stream.read(&result_size, 2) != 2) || (stream.read(&compressionMethod, 2) != 2))
return SCI_ERROR_IO_ERROR;
#ifdef SCUMM_BIG_ENDIAN
compressedLength = GUINT16_SWAP_LE_BE_CONSTANT(compressedLength);
result_size = GUINT16_SWAP_LE_BE_CONSTANT(result_size);
compressionMethod = GUINT16_SWAP_LE_BE_CONSTANT(compressionMethod);
#endif
result->size = result_size;
//if ((result->size < 0) || (compressedLength < 0))
// return SCI_ERROR_DECOMPRESSION_INSANE;
// This return will never happen in SCI0 or SCI1 (does it have any use?)
if (result->size > SCI_MAX_RESOURCE_SIZE)
return SCI_ERROR_RESOURCE_TOO_BIG;
if (compressedLength > 0)
compressedLength -= 0;
else { // Object has size zero (e.g. view.000 in sq3) (does this really exist?)
result->data = 0;
result->status = SCI_STATUS_NOMALLOC;
return SCI_ERROR_EMPTY_OBJECT;
}
buffer = (guint8*)sci_malloc(compressedLength);
result->data = (unsigned char*)sci_malloc(result->size);
if (stream.read(buffer, compressedLength) != compressedLength) {
free(result->data);
free(buffer);
return SCI_ERROR_IO_ERROR;
};
if (!(compressedLength & 1)) { // Align
stream.readByte();
}
#ifdef _SCI_DECOMPRESS_DEBUG
fprintf(stderr, "Resource %i.%s encrypted with method SCI1.1/%hi at %.2f%%"
" ratio\n",
result->number, sci_resource_type_suffixes[result->type],
compressionMethod,
(result->size == 0) ? -1.0 :
(100.0 * compressedLength / result->size));
fprintf(stderr, " compressedLength = 0x%hx, actualLength=0x%hx\n",
compressedLength, result->size);
#endif
DDEBUG("/%d[%d]", compressionMethod, result->size);
switch (compressionMethod) {
case 0: // no compression
if (result->size != compressedLength) {
free(result->data);
result->data = NULL;
result->status = SCI_STATUS_NOMALLOC;
free(buffer);
return SCI_ERROR_DECOMPRESSION_OVERFLOW;
}
memcpy(result->data, buffer, compressedLength);
result->status = SCI_STATUS_ALLOCATED;
break;
case 18:
case 19:
case 20:
if (decrypt4(result->data, buffer, result->size, compressedLength)) {
free(result->data);
result->data = 0; // So that we know that it didn't work
result->status = SCI_STATUS_NOMALLOC;
free(buffer);
return SCI_ERROR_DECOMPRESSION_OVERFLOW;
}
result->status = SCI_STATUS_ALLOCATED;
break;
case 3:
case 4: // NYI
fprintf(stderr, "Resource %d.%s: Warning: compression type #%d not yet implemented\n",
result->number, sci_resource_type_suffixes[result->type], compressionMethod);
free(result->data);
result->data = NULL;
result->status = SCI_STATUS_NOMALLOC;
break;
default:
fprintf(stderr, "Resource %d.%s: Compression method SCI1/%hi not "
"supported!\n", result->number, sci_resource_type_suffixes[result->type],
compressionMethod);
free(result->data);
result->data = NULL; // So that we know that it didn't work
result->status = SCI_STATUS_NOMALLOC;
free(buffer);
return SCI_ERROR_UNKNOWN_COMPRESSION;
}
free(buffer);
return 0;
}
} // End of namespace Sci
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