1 b6afd33e 2003-11-23 devnull #include <u.h>
 2 b6afd33e 2003-11-23 devnull #include <libc.h>
 3 b6afd33e 2003-11-23 devnull #include <flate.h>
 4 b6afd33e 2003-11-23 devnull 
 5 b6afd33e 2003-11-23 devnull typedef struct Block	Block;
 6 b6afd33e 2003-11-23 devnull 
 7 b6afd33e 2003-11-23 devnull struct Block
 8 b6afd33e 2003-11-23 devnull {
 9 b6afd33e 2003-11-23 devnull 	uchar	*pos;
10 b6afd33e 2003-11-23 devnull 	uchar	*limit;
11 b6afd33e 2003-11-23 devnull };
12 b6afd33e 2003-11-23 devnull 
13 b6afd33e 2003-11-23 devnull static int
14 b6afd33e 2003-11-23 devnull blgetc(void *vb)
15 b6afd33e 2003-11-23 devnull {
16 b6afd33e 2003-11-23 devnull 	Block *b;
17 b6afd33e 2003-11-23 devnull 
18 b6afd33e 2003-11-23 devnull 	b = vb;
19 b6afd33e 2003-11-23 devnull 	if(b->pos >= b->limit)
20 b6afd33e 2003-11-23 devnull 		return -1;
21 b6afd33e 2003-11-23 devnull 	return *b->pos++;
22 b6afd33e 2003-11-23 devnull }
23 b6afd33e 2003-11-23 devnull 
24 b6afd33e 2003-11-23 devnull static int
25 b6afd33e 2003-11-23 devnull blwrite(void *vb, void *buf, int n)
26 b6afd33e 2003-11-23 devnull {
27 b6afd33e 2003-11-23 devnull 	Block *b;
28 b6afd33e 2003-11-23 devnull 
29 b6afd33e 2003-11-23 devnull 	b = vb;
30 b6afd33e 2003-11-23 devnull 
31 b6afd33e 2003-11-23 devnull 	if(n > b->limit - b->pos)
32 b6afd33e 2003-11-23 devnull 		n = b->limit - b->pos;
33 b6afd33e 2003-11-23 devnull 	memmove(b->pos, buf, n);
34 b6afd33e 2003-11-23 devnull 	b->pos += n;
35 b6afd33e 2003-11-23 devnull 	return n;
36 b6afd33e 2003-11-23 devnull }
37 b6afd33e 2003-11-23 devnull 
38 b6afd33e 2003-11-23 devnull int
39 b6afd33e 2003-11-23 devnull inflateblock(uchar *dst, int dsize, uchar *src, int ssize)
40 b6afd33e 2003-11-23 devnull {
41 b6afd33e 2003-11-23 devnull 	Block bd, bs;
42 b6afd33e 2003-11-23 devnull 	int ok;
43 b6afd33e 2003-11-23 devnull 
44 b6afd33e 2003-11-23 devnull 	bs.pos = src;
45 b6afd33e 2003-11-23 devnull 	bs.limit = src + ssize;
46 b6afd33e 2003-11-23 devnull 
47 b6afd33e 2003-11-23 devnull 	bd.pos = dst;
48 b6afd33e 2003-11-23 devnull 	bd.limit = dst + dsize;
49 b6afd33e 2003-11-23 devnull 
50 b6afd33e 2003-11-23 devnull 	ok = inflate(&bd, blwrite, &bs, blgetc);
51 b6afd33e 2003-11-23 devnull 	if(ok != FlateOk)
52 b6afd33e 2003-11-23 devnull 		return ok;
53 b6afd33e 2003-11-23 devnull 	return bd.pos - dst;
54 b6afd33e 2003-11-23 devnull }