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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/libflate/deflateblock.c – Rev 2

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