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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <memdraw.h>
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int
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cloadmemimage(Memimage *i, Rectangle r, uchar *data, int ndata)
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{
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	int y, bpl, c, cnt, offs;
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	uchar mem[NMEM], *memp, *omemp, *emem, *linep, *elinep, *u, *eu;
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	if(!rectinrect(r, i->r))
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		return -1;
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	bpl = bytesperline(r, i->depth);
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	u = data;
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	eu = data+ndata;
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	memp = mem;
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	emem = mem+NMEM;
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	y = r.min.y;
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	linep = byteaddr(i, Pt(r.min.x, y));
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	elinep = linep+bpl;
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	for(;;){
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		if(linep == elinep){
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			if(++y == r.max.y)
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				break;
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			linep = byteaddr(i, Pt(r.min.x, y));
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			elinep = linep+bpl;
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		}
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		if(u == eu){	/* buffer too small */
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			return -1;
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		}
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		c = *u++;
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		if(c >= 128){
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			for(cnt=c-128+1; cnt!=0 ;--cnt){
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				if(u == eu){		/* buffer too small */
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					return -1;
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				}
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				if(linep == elinep){	/* phase error */
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					return -1;
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				}
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				*linep++ = *u;
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				*memp++ = *u++;
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				if(memp == emem)
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					memp = mem;
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			}
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		}
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		else{
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			if(u == eu)	/* short buffer */
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				return -1;
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			offs = *u++ + ((c&3)<<8)+1;
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			if(memp-mem < offs)
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				omemp = memp+(NMEM-offs);
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			else
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				omemp = memp-offs;
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			for(cnt=(c>>2)+NMATCH; cnt!=0; --cnt){
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				if(linep == elinep)	/* phase error */
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					return -1;
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				*linep++ = *omemp;
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				*memp++ = *omemp++;
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				if(omemp == emem)
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					omemp = mem;
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				if(memp == emem)
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					memp = mem;
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			}
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		}
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	}
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	return u-data;
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}