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/* ScummVM - Scumm Interpreter
* Copyright (C) 2006 The ScummVM project
*
* cinE Engine is (C) 2004-2005 by CinE Team
*
* 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 "cine/cine.h"
namespace Cine {
uint32 crc; // variable at 5C5A
uint32 bitbucket; // dx:bx
uint16 swap16(uint16 r) {
return (r >> 8) | (r << 8);
}
#define loadd(p, d) {\
d = *(--p);\
d |= (*(--p)) << 8;\
d |= (*(--p)) << 16;\
d |= (*(--p)) << 24;\
}
#define store(p, b) *(--p) = b
#define getbit(p, b) { \
b = bitbucket & 1; \
bitbucket >>= 1; \
if (!bitbucket) { \
loadd(p, bitbucket); \
crc ^= bitbucket; \
b = bitbucket & 1; \
bitbucket >>= 1; \
bitbucket |= 0x80000000;\
} \
}
#define loadbits(p, b) { \
b = 0; \
do { \
getbit(p, bit); \
b <<= 1; \
b |= bit; \
nbits--; \
} while (nbits); \
}
int decomp(uint8 *in, uint8 *out, int size) {
uint8 bit; // Carry flag
uint8 nbits; // cl
uint8 byte = 0; // ch
uint16 counter; // bp
uint16 var = 0; // variable at 5C58
uint16 ptr;
uint16 flags;
enum {
DO_COPY,
DO_UNPACK
} action;
loadd(in, crc);
loadd(in, bitbucket);
crc ^= bitbucket;
do { // 5A4C
getbit(in, bit);
if (!bit) { // 5A94
getbit(in, bit);
if (!bit) { // 5AC8
nbits = 3;
byte = 0;
action = DO_COPY;
} else { // 5ACA
var = 1;
nbits = 8;
action = DO_UNPACK;
}
} else { // 5B4F
nbits = 2;
loadbits(in, flags);
if (flags < 2) {
nbits = flags + 9; // 5BC3
var = flags + 2;
action = DO_UNPACK;
} else if (flags == 3) {
nbits = 8; // 5B4A
byte = 8;
action = DO_COPY;
} else {
nbits = 8;
loadbits(in, var);
nbits = 12;
action = DO_UNPACK;
}
}
switch (action) {
case DO_COPY:
{
// 5AD1
loadbits(in, counter); // 5AFD
counter += byte;
counter++;
size -= counter;
do {
nbits = 8;
loadbits(in, byte); // 5B3F
store(out, byte);
counter--;
} while (counter); // 5B45
break;
}
case DO_UNPACK:
// 5BD3
loadbits(in, ptr); // 5BFF
counter = var + 1;
size -= counter;
do {
byte = *(out + ptr - 1);
store(out, byte);
counter--;
} while (counter);
}
} while (size > 0);
// 5C32
// ???
if (crc) {
return -1;
} else {
return 0;
}
}
} // End of namespace Cine
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