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

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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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Memimage*
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creadmemimage(int fd)
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{
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	char hdr[5*12+1];
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	Rectangle r;
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	int m, nb, miny, maxy, new, ldepth, ncblock;
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	uchar *buf;
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	Memimage *i;
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	ulong chan;
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	if(readn(fd, hdr, 5*12) != 5*12){
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		werrstr("readmemimage: short header (2)");
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		return nil;
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	}
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	/*
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	 * distinguish new channel descriptor from old ldepth.
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	 * channel descriptors have letters as well as numbers,
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	 * while ldepths are a single digit formatted as %-11d.
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	 */
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	new = 0;
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	for(m=0; m<10; m++){
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		if(hdr[m] != ' '){
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			new = 1;
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			break;
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		}
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	}
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	if(hdr[11] != ' '){
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		werrstr("creadimage: bad format");
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		return nil;
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	}
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	if(new){
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		hdr[11] = '\0';
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		if((chan = strtochan(hdr)) == 0){
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			werrstr("creadimage: bad channel string %s", hdr);
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			return nil;
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		}
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	}else{
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		ldepth = ((int)hdr[10])-'0';
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		if(ldepth<0 || ldepth>3){
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			werrstr("creadimage: bad ldepth %d", ldepth);
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			return nil;
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		}
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		chan = drawld2chan[ldepth];
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	}
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	r.min.x=atoi(hdr+1*12);
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	r.min.y=atoi(hdr+2*12);
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	r.max.x=atoi(hdr+3*12);
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	r.max.y=atoi(hdr+4*12);
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	if(r.min.x>r.max.x || r.min.y>r.max.y){
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		werrstr("creadimage: bad rectangle");
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		return nil;
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	}
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	i = allocmemimage(r, chan);
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	if(i == nil)
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		return nil;
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	ncblock = _compblocksize(r, i->depth);
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	buf = malloc(ncblock);
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	if(buf == nil)
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		goto Errout;
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	miny = r.min.y;
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	while(miny != r.max.y){
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		if(readn(fd, hdr, 2*12) != 2*12){
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		Shortread:
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			werrstr("readmemimage: short read");
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		Errout:
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			freememimage(i);
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			free(buf);
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			return nil;
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		}
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		maxy = atoi(hdr+0*12);
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		nb = atoi(hdr+1*12);
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		if(maxy<=miny || r.max.y<maxy){
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			werrstr("readimage: bad maxy %d", maxy);
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			goto Errout;
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		}
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		if(nb<=0 || ncblock<nb){
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			werrstr("readimage: bad count %d", nb);
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			goto Errout;
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		}
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		if(readn(fd, buf, nb)!=nb)
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			goto Shortread;
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		if(!new)	/* old image: flip the data bits */
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			_twiddlecompressed(buf, nb);
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		cloadmemimage(i, Rect(r.min.x, miny, r.max.x, maxy), buf, nb);
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		miny = maxy;
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	}
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	free(buf);
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	return i;
96 
}