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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 "cruise/cruise_main.h"
namespace Cruise {
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 = (uint8)(bitbucket & 1);\
bitbucket >>= 1;\
if (!bitbucket) {\
loadd(p, bitbucket);\
crc ^= bitbucket;\
b = (uint8)(bitbucket & 1);\
bitbucket >>= 1;\
bitbucket |= 0x80000000;\
}\
}
#define loadbits(p, b) {\
b = 0;\
do {\
getbit(p, bit);\
b <<= 1;\
b |= bit;\
nbits--;\
} while (nbits);\
}
int32 decomp(uint8 *in, uint8 *out, int32 size) {
uint8 bit = 0; // Carry flag
uint8 nbits = 0; // cl
uint8 byte = 0; // ch
uint16 counter = 0; // bp
uint16 var = 0; // variable at 5C58
uint16 ptr = 0;
uint16 flags = 0;
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;
}
}
/*
int main(void) {
FILE * in, * out;
uint8 * bufin, * bufout;
uint32 isize, osize;
in = fopen("FIN.FR", "rb");
out = fopen("FIN.FR.out", "wb");
fseek(in, -4, SEEK_END);
bufin = (uint8 *) mallocAndZero((isize = ftell(in)));
fread(&osize, 4, 1, in);
osize = (osize >> 24) | ((osize >> 8) & 0xff00) | ((osize << 8) & 0xff0000) | (osize << 24);
bufout = (uint8 *) mallocAndZero(osize);
fseek(in, 0, SEEK_SET);
fread(bufin, 1, isize, in);
decomp(bufin + isize, bufout + osize, osize);
fwrite(bufout, 1, osize, out);
fclose(out);
fclose(in);
}*/
} // End of namespace Cruise
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