mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-24 10:45:46 +00:00
95 lines
1.6 KiB
C++
95 lines
1.6 KiB
C++
/*
|
|
** Gobliiins 1
|
|
** Original game by CoktelVision
|
|
**
|
|
** Reverse engineered by Ivan Dubrov <WFrag@yandex.ru>
|
|
**
|
|
*/
|
|
#include "gob/gob.h"
|
|
#include "gob/pack.h"
|
|
#include "gob/debug.h"
|
|
|
|
namespace Gob {
|
|
|
|
int32 unpackData(char *sourceBuf, char *destBuf) {
|
|
uint32 realSize;
|
|
uint32 counter;
|
|
uint16 cmd;
|
|
byte *src;
|
|
byte *dest;
|
|
byte *tmpBuf;
|
|
int16 off;
|
|
byte len;
|
|
byte i;
|
|
int16 j;
|
|
uint16 tmpIndex;
|
|
|
|
realSize = READ_LE_UINT32(sourceBuf);
|
|
counter = READ_LE_UINT32(sourceBuf);
|
|
|
|
tmpBuf = (byte *)malloc(4114);
|
|
|
|
/*
|
|
* Can use assembler unpacker for small blocks - for speed.
|
|
* Don't need this anymore :)
|
|
*/
|
|
/*
|
|
* if(realSize < 65000)
|
|
* {
|
|
* asm_unpackData(sourceBuf, destBuf, tmpBuf);
|
|
* free(tmpBuf);
|
|
* return realSize;
|
|
* }
|
|
*/
|
|
|
|
if (tmpBuf == 0)
|
|
return 0;
|
|
|
|
for (j = 0; j < 4078; j++)
|
|
tmpBuf[j] = 0x20;
|
|
tmpIndex = 4078;
|
|
|
|
src = (byte *)(sourceBuf + 4);
|
|
dest = (byte *)destBuf;
|
|
|
|
cmd = 0;
|
|
while (1) {
|
|
cmd >>= 1;
|
|
if ((cmd & 0x0100) == 0) {
|
|
cmd = *src | 0xff00;
|
|
src++;
|
|
}
|
|
if ((cmd & 1) != 0) { /* copy */
|
|
*dest++ = *src;
|
|
tmpBuf[tmpIndex] = *src;
|
|
src++;
|
|
tmpIndex++;
|
|
tmpIndex %= 4096;
|
|
counter--;
|
|
if (counter == 0)
|
|
break;
|
|
} else { /* copy string */
|
|
|
|
off = *src++;
|
|
off |= (*src & 0xf0) << 4;
|
|
len = (*src & 0x0f) + 3;
|
|
src++;
|
|
for (i = 0; i < len; i++) {
|
|
*dest++ = tmpBuf[(off + i) % 4096];
|
|
counter--;
|
|
if (counter == 0) {
|
|
free(tmpBuf);
|
|
return realSize;
|
|
}
|
|
tmpBuf[tmpIndex] = tmpBuf[(off + i) % 4096];
|
|
tmpIndex++;
|
|
tmpIndex %= 4096;
|
|
}
|
|
}
|
|
}
|
|
free(tmpBuf);
|
|
return realSize;
|
|
}
|
|
|
|
} // End of namespace Gob
|