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/* ScummVM - Scumm Interpreter
* Copyright (C) 2004 Ivan Dubrov
* Copyright (C) 2004-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#include "common/stdafx.h"
#include "common/endian.h"
#include "gob/gob.h"
#include "gob/pack.h"
namespace Gob {
int32 Pack::unpackData(char *sourceBuf, char *destBuf) {
uint32 realSize;
uint32 counter;
uint16 cmd;
byte *src;
byte *dest;
byte *tmpBuf;
int16 off;
byte len;
byte i;
int16 j;
uint16 tmpIndex;
realSize = READ_LE_UINT32(sourceBuf);
counter = READ_LE_UINT32(sourceBuf);
tmpBuf = new byte[4114];
/*
* Can use assembler unpacker for small blocks - for speed.
* Don't need this anymore :)
*/
/*
* if (realSize < 65000)
* {
* asm_unpackData(sourceBuf, destBuf, tmpBuf);
* free(tmpBuf);
* return realSize;
* }
*/
if (tmpBuf == 0)
return 0;
for (j = 0; j < 4078; j++)
tmpBuf[j] = 0x20;
tmpIndex = 4078;
src = (byte *)(sourceBuf + 4);
dest = (byte *)destBuf;
cmd = 0;
while (1) {
cmd >>= 1;
if ((cmd & 0x0100) == 0) {
cmd = *src | 0xff00;
src++;
}
if ((cmd & 1) != 0) { /* copy */
*dest++ = *src;
tmpBuf[tmpIndex] = *src;
src++;
tmpIndex++;
tmpIndex %= 4096;
counter--;
if (counter == 0)
break;
} else { /* copy string */
off = *src++;
off |= (*src & 0xf0) << 4;
len = (*src & 0x0f) + 3;
src++;
for (i = 0; i < len; i++) {
*dest++ = tmpBuf[(off + i) % 4096];
counter--;
if (counter == 0) {
delete[] tmpBuf;
return realSize;
}
tmpBuf[tmpIndex] = tmpBuf[(off + i) % 4096];
tmpIndex++;
tmpIndex %= 4096;
}
}
}
delete[] tmpBuf;
return realSize;
}
} // End of namespace Gob
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