mirror of
https://github.com/scummvm/scummvm.git
synced 2026-06-20 05:45:29 +00:00
Vladimir Serbinenko
c5373134d2
Toon has a RNC implementation with 2 differences from the one taken from SKY: 1. Protection against overread. Add it to common version and adjust callers in sky. 2. Lack of key parameter for obfuscation. We ignore it anyway and don't support obfuscation, so delete it in common version as well
127 lines
2.8 KiB
C++
127 lines
2.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/debug.h"
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#include "toon/tools.h"
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#include "toon/toon.h"
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namespace Toon {
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uint32 decompressLZSS(byte *src, byte *dst, int dstsize) {
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debugC(5, kDebugTools, "decompressLZSS(src, dst, %d)", dstsize);
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byte *srcp = src;
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byte *dstp = dst;
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uint16 bitbuf;
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int32 len, ofs;
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len = 0;
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while (dstsize > 0) {
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bitbuf = 0x100 | *(srcp++);
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while (bitbuf != 1 && dstsize > 0) {
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if (bitbuf & 1) {
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ofs = READ_LE_UINT16(srcp);
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srcp += 2;
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len = ((ofs & 0xF000) >> 12) + 3;
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ofs = ofs | 0xF000;
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dstsize -= len;
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if (dstsize < 0)
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break;
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while (len--) {
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*dstp = *(byte *)(dstp + (signed short)ofs);
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dstp++;
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}
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} else {
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len = 0;
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while ((bitbuf & 2) == 0) {
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len++;
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bitbuf >>= 1;
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}
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len++;
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dstsize -= len;
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if (dstsize < 0)
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break;
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while (len--)
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*(dstp++) = *(srcp++);
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}
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bitbuf >>= 1;
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}
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}
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len += dstsize;
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if (len < 0)
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return 0;
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while (len--)
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*(dstp++) = *(srcp++);
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return (dstp - dst);
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}
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uint32 decompressSPCN(byte *src, byte *dst, uint32 dstsize) {
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debugC(1, kDebugTools, "decompressSPCN(src, dst, %d)", dstsize);
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byte *srcp = src;
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byte *dstp = dst, *dste = dst + dstsize;
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byte val;
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uint16 len, ofs;
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if (!(*srcp & 0x80)) srcp++;
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while (dstp < dste) {
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val = *(srcp++);
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if (val & 0x80) {
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if (val & 0x40) {
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if (val == 0xFE) {
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len = READ_LE_UINT16(srcp);
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while (len--)
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*(dstp++) = srcp[2];
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srcp += 3;
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} else {
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if (val == 0xFF) {
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len = READ_LE_UINT16(srcp);
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srcp += 2;
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} else {
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len = (val & 0x3F) + 3;
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}
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ofs = READ_LE_UINT16(srcp);
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srcp += 2;
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while (len--) {
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*dstp = *(byte *)(dstp - ofs);
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dstp++;
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}
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}
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} else {
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len = val & 0x3F;
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while (len--)
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*(dstp++) = *(srcp++);
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}
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} else {
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len = (val >> 4) + 3;
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ofs = ((val & 0x0F) << 8) | *(srcp++);
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while (len--) {
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*dstp = *(byte *)(dstp - ofs);
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dstp++;
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}
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}
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}
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return (dstp - dst);
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}
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} // End of namespace Toon
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