mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-23 02:11:38 +00:00
517 lines
11 KiB
C++
517 lines
11 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
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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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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//return codes
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#define NOT_PACKED 0
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#define PACKED_CRC -1
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#define UNPACKED_CRC -2
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//other defines
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#define TABLE_SIZE (16 * 8)
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#define MIN_LENGTH 2
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#define HEADER_LEN 18
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RncDecoder::RncDecoder() {
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initCrc();
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}
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RncDecoder::~RncDecoder() { }
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void RncDecoder::initCrc() {
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debugC(1, kDebugTools, "initCrc()");
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uint16 cnt = 0;
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uint16 tmp1 = 0;
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uint16 tmp2 = 0;
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for (tmp2 = 0; tmp2 < 0x100; tmp2++) {
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tmp1 = tmp2;
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for (cnt = 8; cnt > 0; cnt--) {
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if (tmp1 % 2) {
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tmp1 >>= 1;
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tmp1 ^= 0x0a001;
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} else
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tmp1 >>= 1;
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}
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_crcTable[tmp2] = tmp1;
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}
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}
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//calculate 16 bit crc of a block of memory
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uint16 RncDecoder::crcBlock(const uint8 *block, uint32 size) {
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debugC(1, kDebugTools, "crcBlock(block, %d)", size);
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uint16 crc = 0;
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uint8 *crcTable8 = (uint8 *)_crcTable; //make a uint8* to crc_table
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uint8 tmp;
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uint32 i;
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for (i = 0; i < size; i++) {
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tmp = *block++;
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crc ^= tmp;
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tmp = (uint8)((crc >> 8) & 0x00FF);
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crc &= 0x00FF;
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crc = *(uint16 *)&crcTable8[crc << 1];
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crc ^= tmp;
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}
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return crc;
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}
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uint16 RncDecoder::inputBits(uint8 amount) {
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debugC(5, kDebugTools, "inputBits(%d)", amount);
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uint16 newBitBuffh = _bitBuffh;
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uint16 newBitBuffl = _bitBuffl;
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int16 newBitCount = _bitCount;
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uint16 remBits, returnVal;
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returnVal = ((1 << amount) - 1) & newBitBuffl;
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newBitCount -= amount;
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if (newBitCount < 0) {
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newBitCount += amount;
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remBits = (newBitBuffh << (16 - newBitCount));
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newBitBuffh >>= newBitCount;
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newBitBuffl >>= newBitCount;
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newBitBuffl |= remBits;
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_srcPtr += 2;
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newBitBuffh = READ_LE_UINT16(_srcPtr);
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amount -= newBitCount;
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newBitCount = 16 - amount;
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}
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remBits = (newBitBuffh << (16 - amount));
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_bitBuffh = newBitBuffh >> amount;
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_bitBuffl = (newBitBuffl >> amount) | remBits;
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_bitCount = (uint8)newBitCount;
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return returnVal;
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}
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void RncDecoder::makeHufftable(uint16 *table) {
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debugC(1, kDebugTools, "makeHufftable(table)");
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uint16 bitLength, i, j;
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uint16 numCodes = inputBits(5);
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if (!numCodes)
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return;
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uint8 huffLength[16];
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for (i = 0; i < numCodes; i++)
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huffLength[i] = (uint8)(inputBits(4) & 0x00FF);
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uint16 huffCode = 0;
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for (bitLength = 1; bitLength < 17; bitLength++) {
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for (i = 0; i < numCodes; i++) {
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if (huffLength[i] == bitLength) {
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*table++ = (1 << bitLength) - 1;
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uint16 b = huffCode >> (16 - bitLength);
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uint16 a = 0;
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for (j = 0; j < bitLength; j++)
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a |= ((b >> j) & 1) << (bitLength - j - 1);
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*table++ = a;
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*(table + 0x1e) = (huffLength[i] << 8) | (i & 0x00FF);
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huffCode += 1 << (16 - bitLength);
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}
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}
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}
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}
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uint16 RncDecoder::inputValue(uint16 *table) {
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debugC(5, kDebugTools, "inputValue(table)");
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uint16 valOne, valTwo, value = _bitBuffl;
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do {
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valTwo = (*table++) & value;
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valOne = *table++;
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} while (valOne != valTwo);
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value = *(table + 0x1e);
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inputBits((uint8)((value >> 8) & 0x00FF));
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value &= 0x00FF;
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if (value >= 2) {
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value--;
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valOne = inputBits((uint8)value & 0x00FF);
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valOne |= (1 << value);
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value = valOne;
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}
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return value;
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}
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int RncDecoder::getbit() {
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debugC(6, kDebugTools, "getbits()");
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if (_bitCount == 0) {
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_bitBuffl = *_srcPtr++;
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_bitCount = 8;
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}
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byte temp = (_bitBuffl & 0x80) >> 7;
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_bitBuffl <<= 1;
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_bitCount--;
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return temp;
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}
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int32 RncDecoder::unpackM1(const void *input, void *output) {
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debugC(1, kDebugTools, "unpackM1(input, output)");
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uint8 *outputLow, *outputHigh;
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const uint8 *inputHigh, *inputptr = (const uint8 *)input;
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uint32 unpackLen = 0;
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uint32 packLen = 0;
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uint16 counts = 0;
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uint16 crcUnpacked = 0;
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uint16 crcPacked = 0;
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_bitBuffl = 0;
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_bitBuffh = 0;
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_bitCount = 0;
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//Check for "RNC "
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if (READ_BE_UINT32(inputptr) != RNC1_SIGNATURE)
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return NOT_PACKED;
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inputptr += 4;
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// read unpacked/packed file length
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unpackLen = READ_BE_UINT32(inputptr);
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inputptr += 4;
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packLen = READ_BE_UINT32(inputptr);
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inputptr += 4;
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uint8 blocks = *(inputptr + 5);
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//read CRC's
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crcUnpacked = READ_BE_UINT16(inputptr);
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inputptr += 2;
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crcPacked = READ_BE_UINT16(inputptr);
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inputptr += 2;
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inputptr = (inputptr + HEADER_LEN - 16);
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if (crcBlock(inputptr, packLen) != crcPacked)
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return PACKED_CRC;
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inputptr = (((const uint8 *)input) + HEADER_LEN);
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_srcPtr = inputptr;
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inputHigh = ((const uint8 *)input) + packLen + HEADER_LEN;
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outputLow = (uint8 *)output;
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outputHigh = *(((const uint8 *)input) + 16) + unpackLen + outputLow;
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if (!((inputHigh <= outputLow) || (outputHigh <= inputHigh))) {
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_srcPtr = inputHigh;
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_dstPtr = outputHigh;
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memcpy((_dstPtr - packLen), (_srcPtr - packLen), packLen);
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_srcPtr = (_dstPtr - packLen);
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}
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_dstPtr = (uint8 *)output;
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_bitCount = 0;
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_bitBuffl = READ_LE_UINT16(_srcPtr);
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inputBits(2);
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do {
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makeHufftable(_rawTable);
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makeHufftable(_posTable);
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makeHufftable(_lenTable);
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counts = inputBits(16);
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do {
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uint32 inputLength = inputValue(_rawTable);
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uint32 inputOffset;
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if (inputLength) {
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memcpy(_dstPtr, _srcPtr, inputLength); //memcpy is allowed here
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_dstPtr += inputLength;
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_srcPtr += inputLength;
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uint16 a = READ_LE_UINT16(_srcPtr);
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uint16 b = READ_LE_UINT16(_srcPtr + 2);
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_bitBuffl &= ((1 << _bitCount) - 1);
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_bitBuffl |= (a << _bitCount);
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_bitBuffh = (a >> (16 - _bitCount)) | (b << _bitCount);
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}
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if (counts > 1) {
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inputOffset = inputValue(_posTable) + 1;
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inputLength = inputValue(_lenTable) + MIN_LENGTH;
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// Don't use memcpy here! because input and output overlap.
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uint8 *tmpPtr = (_dstPtr - inputOffset);
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while (inputLength--)
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*_dstPtr++ = *tmpPtr++;
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}
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} while (--counts);
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} while (--blocks);
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if (crcBlock((uint8 *)output, unpackLen) != crcUnpacked)
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return UNPACKED_CRC;
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// all is done..return the amount of unpacked bytes
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return unpackLen;
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}
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int32 RncDecoder::unpackM2(const void *input, void *output) {
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debugC(1, kDebugTools, "unpackM2(input, output)");
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const uint8 *inputptr = (const uint8 *)input;
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uint32 unpackLen = 0;
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uint32 packLen = 0;
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uint16 crcUnpacked = 0;
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uint16 crcPacked = 0;
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// Strangerke - Commented (not used)
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// uint16 counts = 0;
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_bitBuffl = 0;
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_bitCount = 0;
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//Check for "RNC "
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if (READ_BE_UINT32(inputptr) != RNC2_SIGNATURE)
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return NOT_PACKED;
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inputptr += 4;
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// read unpacked/packed file length
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unpackLen = READ_BE_UINT32(inputptr);
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inputptr += 4;
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packLen = READ_BE_UINT32(inputptr);
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inputptr += 4;
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//read CRC's
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crcUnpacked = READ_BE_UINT16(inputptr);
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inputptr += 2;
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crcPacked = READ_BE_UINT16(inputptr);
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inputptr += 2;
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inputptr = (inputptr + HEADER_LEN - 16);
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if (crcBlock(inputptr, packLen) != crcPacked)
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return PACKED_CRC;
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inputptr = (((const uint8 *)input) + HEADER_LEN);
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_srcPtr = inputptr;
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_dstPtr = (uint8 *)output;
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uint16 ofs, len;
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byte ofs_hi, ofs_lo;
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len = 0;
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ofs_hi = 0;
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ofs_lo = 0;
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getbit();
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getbit();
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while (1) {
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bool loadVal = false;
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while (getbit() == 0)
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*_dstPtr++ = *_srcPtr++;
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len = 2;
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ofs_hi = 0;
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if (getbit() == 0) {
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len = (len << 1) | getbit();
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if (getbit() == 1) {
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len--;
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len = (len << 1) | getbit();
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if (len == 9) {
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len = 4;
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while (len--)
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ofs_hi = (ofs_hi << 1) | getbit();
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len = (ofs_hi + 3) * 4;
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while (len--)
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*_dstPtr++ = *_srcPtr++;
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continue;
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}
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}
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loadVal = true;
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} else {
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if (getbit() == 1) {
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len++;
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if (getbit() == 1) {
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len = *_srcPtr++;
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if (len == 0) {
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if (getbit() == 1)
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continue;
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else
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break;
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}
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len += 8;
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}
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loadVal = true;
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} else {
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loadVal = false;
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}
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}
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if (loadVal) {
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if (getbit() == 1) {
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ofs_hi = (ofs_hi << 1) | getbit();
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if (getbit() == 1) {
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ofs_hi = ((ofs_hi << 1) | getbit()) | 4;
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if (getbit() == 0)
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ofs_hi = (ofs_hi << 1) | getbit();
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} else if (ofs_hi == 0) {
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ofs_hi = 2 | getbit();
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}
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}
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}
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ofs_lo = *_srcPtr++;
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ofs = (ofs_hi << 8) | ofs_lo;
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while (len--) {
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*_dstPtr = *(byte *)(_dstPtr - ofs - 1);
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_dstPtr++;
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}
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}
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if (crcBlock((uint8 *)output, unpackLen) != crcUnpacked)
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return UNPACKED_CRC;
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// all is done..return the amount of unpacked bytes
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return unpackLen;
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}
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} // End of namespace Toon
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