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