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#define	VOLDESC	16	/* sector number */
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/*
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 * L means little-endian, M means big-endian, and LM means little-endian
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 * then again big-endian.
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 */
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typedef uchar		Byte2L[2];
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typedef uchar		Byte2M[2];
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typedef uchar		Byte4LM[4];
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typedef uchar		Byte4L[4];
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typedef uchar		Byte4M[4];
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typedef uchar		Byte8LM[8];
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typedef union Drec	Drec;
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typedef union Voldesc	Voldesc;
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enum
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{
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	Boot		= 0,
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	Primary		= 1,
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	Supplementary	= 2,
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	Partition	= 3,
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	Terminator	= 255
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};
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union	Voldesc
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{			/* volume descriptor */
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	uchar	byte[Sectorsize];
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	union {			/* for CD001, the ECMA standard */
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		struct
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		{
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			uchar	type;
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			uchar	stdid[5];
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			uchar	version;
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			uchar	unused;
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			uchar	sysid[32];
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			uchar	bootid[32];
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			uchar	data[1977];
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		} boot;
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		struct
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		{
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			uchar	type;
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			uchar	stdid[5];
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			uchar	version;
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			uchar	flags;
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			uchar	sysid[32];
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			uchar	volid[32];
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			Byte8LM	partloc;
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			Byte8LM	size;
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			uchar	escapes[32];
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			Byte4LM	vsetsize;
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			Byte4LM	vseqno;
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			Byte4LM	blksize;
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			Byte8LM	ptabsize;
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			Byte4L	lptable;
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			Byte4L	optlptable;
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			Byte4M	mptable;
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			Byte4M	optmptable;
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			uchar	rootdir[34];
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			uchar	volsetid[128];
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			uchar	pubid[128];
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			uchar	prepid[128];
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			uchar	appid[128];
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			uchar	copyright[37];
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			uchar	abstract[37];
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			uchar	bibliography[37];
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			uchar	cdate[17];
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			uchar	mdate[17];
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			uchar	expdate[17];
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			uchar	effdate[17];
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			uchar	fsversion;
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			uchar	unused3[1];
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			uchar	appuse[512];
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			uchar	unused4[653];
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		} desc;
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	} z;
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	union
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	{			/* for CDROM, the `High Sierra' standard */
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		struct
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		{
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			Byte8LM	number;
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			uchar	type;
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			uchar	stdid[5];
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			uchar	version;
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			uchar	flags;
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			uchar	sysid[32];
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			uchar	volid[32];
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			Byte8LM	partloc;
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			Byte8LM	size;
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			uchar	escapes[32];
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			Byte4LM	vsetsize;
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			Byte4LM	vseqno;
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			Byte4LM	blksize;
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			uchar	quux[40];
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			uchar	rootdir[34];
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			uchar	volsetid[128];
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			uchar	pubid[128];
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			uchar	prepid[128];
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			uchar	appid[128];
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			uchar	copyright[32];
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			uchar	abstract[32];
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			uchar	cdate[16];
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			uchar	mdate[16];
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			uchar	expdate[16];
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			uchar	effdate[16];
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			uchar	fsversion;
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		} desc;
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	} r;
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};
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union	Drec
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{
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	struct
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	{
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		uchar	reclen;
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		uchar	attrlen;
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		Byte8LM	addr;
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		Byte8LM	size;
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		uchar	date[6];
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		uchar	tzone;		/* flags in high sierra */
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		uchar	flags;		/* ? in high sierra */
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		uchar	unitsize;	/* ? in high sierra */
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		uchar	gapsize;	/* ? in high sierra */
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		Byte4LM	vseqno;		/* ? in high sierra */
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		uchar	namelen;
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		uchar	name[1];
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	};
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	struct
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	{
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		uchar	r_pad[24];
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		uchar	r_flags;
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	};
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};
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struct	Isofile
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{
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	short	fmt;		/* 'z' if iso, 'r' if high sierra */
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	short	blksize;
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	vlong	offset;		/* true offset when reading directory */
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	long	odelta;		/* true size of directory just read */
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	vlong	doffset;	/* plan9 offset when reading directory */
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	Drec	d;
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};