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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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Memsubfont*
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openmemsubfont(char *name)
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{
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	Memsubfont *sf;
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	Memimage *i;
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	Fontchar *fc;
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	int fd, n;
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	char hdr[3*12+4+1];
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	uchar *p;
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	fd = open(name, OREAD);
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	if(fd < 0)
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		return nil;
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	p = nil;
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	i = readmemimage(fd);
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	if(i == nil)
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		goto Err;
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	if(read(fd, hdr, 3*12) != 3*12){
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		werrstr("openmemsubfont: header read error: %r");
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		goto Err;
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	}
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	n = atoi(hdr);
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	p = malloc(6*(n+1));
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	if(p == nil)
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		goto Err;
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	if(read(fd, p, 6*(n+1)) != 6*(n+1)){
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		werrstr("openmemsubfont: fontchar read error: %r");
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		goto Err;
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	}
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	fc = malloc(sizeof(Fontchar)*(n+1));
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	if(fc == nil)
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		goto Err;
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	_unpackinfo(fc, p, n);
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	sf = allocmemsubfont(name, n, atoi(hdr+12), atoi(hdr+24), fc, i);
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	if(sf == nil){
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		free(fc);
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		goto Err;
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	}
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	free(p);
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	return sf;
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Err:
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	close(fd);
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	if (i != nil)
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		freememimage(i);
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	if (p != nil)
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		free(p);
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	return nil;
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}