mirror of
https://github.com/libretro/scummvm.git
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134 lines
3.3 KiB
C++
134 lines
3.3 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 "bladerunner/decompress_lcw.h"
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#include "common/util.h"
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namespace BladeRunner {
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uint32 decompress_lcw(uint8 *inBuf, uint32 inLen, uint8 *outBuf, uint32 outLen) {
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int version = 1;
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int count, i, color, pos, relpos;
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uint8 *src = inBuf;
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uint8 *dst = outBuf;
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uint8 *outEnd = dst + outLen;
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if (src[0] == 0) {
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version = 2;
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++src;
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}
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while (src < inBuf + inLen && dst < outEnd && src[0] != 0x80) {
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int out_remain = (int)(outEnd - dst);
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if (src[0] == 0xff) { // 0b11111111
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count = src[1] | (src[2] << 8);
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pos = src[3] | (src[4] << 8);
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src += 5;
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count = MIN(count, out_remain);
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if (version == 1) {
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for (i = 0; i < count; ++i)
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dst[i] = outBuf[i + pos];
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} else {
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for (i = 0; i < count; ++i)
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dst[i] = *(dst + i - pos);
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}
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} else if (src[0] == 0xfe) { // 0b11111110
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count = src[1] | (src[2] << 8);
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color = src[3];
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src += 4;
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count = MIN(count, out_remain);
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memset(dst, color, count);
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} else if (src[0] >= 0xc0) { // 0b11??????
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count = (src[0] & 0x3f) + 3;
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pos = src[1] | (src[2] << 8);
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src += 3;
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count = MIN(count, out_remain);
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if (version == 1) {
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for (i = 0; i < count; ++i)
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dst[i] = outBuf[i + pos];
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} else {
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for (i = 0; i < count; ++i)
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dst[i] = *(dst + i - pos);
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}
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} else if (src[0] >= 0x80) { // 0b10??????
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count = src[0] & 0x3f;
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++src;
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count = MIN(count, out_remain);
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memcpy(dst, src, count);
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src += count;
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} else { // 0b0???????
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count = ((src[0] & 0x70) >> 4) + 3;
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relpos = ((src[0] & 0x0f) << 8) | src[1];
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src += 2;
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count = MIN(count, out_remain);
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for (i = 0; i < count; ++i) {
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dst[i] = *(dst + i - relpos);
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}
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}
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dst += count;
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}
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return uint32(dst - outBuf);
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}
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uint32 decompress_lcw_output_size(uint8 *inBuf, uint32 inLen) {
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int count;
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uint8 *src = inBuf;
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uint32 outsize = 0;
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if (src[0] == 0)
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++src;
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while (src[0] != 0x80 && src < inBuf + inLen) {
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if (src[0] == 0xff) { // 0b11111111
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count = src[1] | (src[2] << 8);
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src += 5;
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} else if (src[0] == 0xfe) { // 0b11111110
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count = src[1] | (src[2] << 8);
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src += 4;
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} else if (src[0] >= 0xc0) { // 0b11??????
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count = (src[0] & 0x3f) + 3;
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src += 3;
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} else if (src[0] & 0x80) { // 0b10??????
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count = src[0] & 0x3f;
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src += count + 1;
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} else { // 0b0???????
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count = ((src[0] & 0x70) >> 4) + 3;
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src += 2;
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}
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outsize += count;
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}
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return outsize;
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}
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} // End of namespace BladeRunner
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