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108 lines
2.3 KiB
C++
108 lines
2.3 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2004 Ivan Dubrov
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* Copyright (C) 2004-2005 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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* $Header$
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*
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*/
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#include "gob/gob.h"
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#include "gob/pack.h"
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namespace Gob {
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int32 unpackData(char *sourceBuf, char *destBuf) {
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uint32 realSize;
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uint32 counter;
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uint16 cmd;
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byte *src;
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byte *dest;
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byte *tmpBuf;
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int16 off;
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byte len;
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byte i;
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int16 j;
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uint16 tmpIndex;
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realSize = READ_LE_UINT32(sourceBuf);
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counter = READ_LE_UINT32(sourceBuf);
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tmpBuf = (byte *)malloc(4114);
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/*
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* Can use assembler unpacker for small blocks - for speed.
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* Don't need this anymore :)
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*/
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/*
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* if(realSize < 65000)
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* {
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* asm_unpackData(sourceBuf, destBuf, tmpBuf);
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* free(tmpBuf);
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* return realSize;
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* }
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*/
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if (tmpBuf == 0)
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return 0;
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for (j = 0; j < 4078; j++)
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tmpBuf[j] = 0x20;
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tmpIndex = 4078;
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src = (byte *)(sourceBuf + 4);
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dest = (byte *)destBuf;
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cmd = 0;
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while (1) {
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cmd >>= 1;
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if ((cmd & 0x0100) == 0) {
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cmd = *src | 0xff00;
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src++;
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}
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if ((cmd & 1) != 0) { /* copy */
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*dest++ = *src;
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tmpBuf[tmpIndex] = *src;
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src++;
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tmpIndex++;
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tmpIndex %= 4096;
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counter--;
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if (counter == 0)
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break;
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} else { /* copy string */
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off = *src++;
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off |= (*src & 0xf0) << 4;
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len = (*src & 0x0f) + 3;
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src++;
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for (i = 0; i < len; i++) {
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*dest++ = tmpBuf[(off + i) % 4096];
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counter--;
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if (counter == 0) {
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free(tmpBuf);
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return realSize;
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}
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tmpBuf[tmpIndex] = tmpBuf[(off + i) % 4096];
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tmpIndex++;
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tmpIndex %= 4096;
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}
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}
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}
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free(tmpBuf);
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return realSize;
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}
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} // End of namespace Gob
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