1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/* ScummVM - Scumm Interpreter
* Copyright (C) 2004 Ivan Dubrov
* Copyright (C) 2004-2005 The ScummVM project
*
* 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.
*
* $Header$
*
*/
#include "gob/gob.h"
#include "gob/pack.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
|
