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
|
#import "XADCompactProRLEHandle.h"
@implementation XADCompactProRLEHandle:CSByteStreamHandle
-(void)resetByteStream
{
saved=0;
repeat=0;
halfescaped=NO;
}
-(uint8_t)produceByteAtOffset:(off_t)pos
{
//NSLog(@"rle %d %d",(int)pos,(int)CSInputBufferOffset(input));
if(repeat)
{
repeat--;
return saved;
}
int byte;
if(halfescaped)
{
byte=0x81;
halfescaped=NO;
}
else byte=CSInputNextByte(input);
if(byte==0x81)
{
byte=CSInputNextByte(input);
if(byte==0x82)
{
byte=CSInputNextByte(input);
if(byte!=0)
{
repeat=byte-2; // ?
return saved;
}
else
{
repeat=1;
saved=0x82;
return 0x81;
}
}
else
{
if(byte==0x81)
{
halfescaped=YES;
return saved=0x81;
}
else
{
repeat=1;
saved=byte;
return 0x81;
}
}
}
else return saved=byte;
}
@end
|
