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#include	<u.h>
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#include	<libc.h>
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#include	<fcall.h>
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uint
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sizeD2M(Dir *d)
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{
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	char *sv[4];
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	int i, ns;
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	sv[0] = d->name;
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	sv[1] = d->uid;
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	sv[2] = d->gid;
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	sv[3] = d->muid;
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	ns = 0;
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	for(i = 0; i < 4; i++)
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		if(sv[i])
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			ns += strlen(sv[i]);
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	return STATFIXLEN + ns;
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}
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uint
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convD2M(Dir *d, uchar *buf, uint nbuf)
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{
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	uchar *p, *ebuf;
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	char *sv[4];
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	int i, ns, nsv[4], ss;
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	if(nbuf < BIT16SZ)
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		return 0;
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	p = buf;
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	ebuf = buf + nbuf;
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	sv[0] = d->name;
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	sv[1] = d->uid;
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	sv[2] = d->gid;
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	sv[3] = d->muid;
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	ns = 0;
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	for(i = 0; i < 4; i++){
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		if(sv[i])
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			nsv[i] = strlen(sv[i]);
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		else
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			nsv[i] = 0;
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		ns += nsv[i];
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	}
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	ss = STATFIXLEN + ns;
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	/* set size before erroring, so user can know how much is needed */
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	/* note that length excludes count field itself */
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	PBIT16(p, ss-BIT16SZ);
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	p += BIT16SZ;
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	if(ss > nbuf)
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		return BIT16SZ;
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	PBIT16(p, d->type);
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	p += BIT16SZ;
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	PBIT32(p, d->dev);
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	p += BIT32SZ;
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	PBIT8(p, d->qid.type);
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	p += BIT8SZ;
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	PBIT32(p, d->qid.vers);
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	p += BIT32SZ;
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	PBIT64(p, d->qid.path);
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	p += BIT64SZ;
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	PBIT32(p, d->mode);
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	p += BIT32SZ;
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	PBIT32(p, d->atime);
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	p += BIT32SZ;
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	PBIT32(p, d->mtime);
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	p += BIT32SZ;
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	PBIT64(p, d->length);
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	p += BIT64SZ;
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	for(i = 0; i < 4; i++){
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		ns = nsv[i];
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		if(p + ns + BIT16SZ > ebuf)
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			return 0;
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		PBIT16(p, ns);
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		p += BIT16SZ;
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		if(ns)
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			memmove(p, sv[i], ns);
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		p += ns;
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	}
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	if(ss != p - buf)
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		return 0;
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	return p - buf;
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}