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 blread(void *vb, void *buf, int n)
15 {
16 	Block *b;
17 
18 	b = vb;
19 	if(n > b->limit - b->pos)
20 		n = b->limit - b->pos;
21 	memmove(buf, b->pos, n);
22 	b->pos += n;
23 	return n;
24 }
25 
26 static int
27 blwrite(void *vb, void *buf, int n)
28 {
29 	Block *b;
30 
31 	b = vb;
32 
33 	if(n > b->limit - b->pos)
34 		n = b->limit - b->pos;
35 	memmove(b->pos, buf, n);
36 	b->pos += n;
37 	return n;
38 }
39 
40 int
41 deflateblock(uchar *dst, int dsize, uchar *src, int ssize, int level, int debug)
42 {
43 	Block bd, bs;
44 	int ok;
45 
46 	bs.pos = src;
47 	bs.limit = src + ssize;
48 
49 	bd.pos = dst;
50 	bd.limit = dst + dsize;
51 
52 	ok = deflate(&bd, blwrite, &bs, blread, level, debug);
53 	if(ok != FlateOk)
54 		return ok;
55 	return bd.pos - dst;
56 }