#include <u.h>#include <libc.h>#include <flate.h> typedef struct Block	Block; struct Block{	uchar	*pos;	uchar	*limit;}; static intblread(void *vb, void *buf, int n){	Block *b; 	b = vb;	if(n > b->limit - b->pos)		n = b->limit - b->pos;	memmove(buf, b->pos, n);	b->pos += n;	return n;} static intblwrite(void *vb, void *buf, int n){	Block *b; 	b = vb; 	if(n > b->limit - b->pos)		n = b->limit - b->pos;	memmove(b->pos, buf, n);	b->pos += n;	return n;} intdeflateblock(uchar *dst, int dsize, uchar *src, int ssize, int level, int debug){	Block bd, bs;	int ok; 	bs.pos = src;	bs.limit = src + ssize; 	bd.pos = dst;	bd.limit = dst + dsize; 	ok = deflate(&bd, blwrite, &bs, blread, level, debug);	if(ok != FlateOk)		return ok;	return bd.pos - dst;}