/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ typedef struct Dosboot		Dosboot;typedef struct Dosboot32	Dosboot32;typedef struct Dosbpb		Dosbpb;typedef struct Dosdir		Dosdir;typedef struct Dospart		Dospart;typedef struct Dosptr		Dosptr;typedef struct Fatinfo		Fatinfo;typedef struct Xfs		Xfs;typedef struct Xfile		Xfile; struct Dospart{	uchar	active;	uchar	hstart;	uchar	cylstart[2];	uchar	type;	uchar	hend;	uchar	cylend[2];	uchar	start[4];	uchar	length[4];}; enum{	/*	 * dos partition types	 */	FAT12		= 0x01,	FAT16		= 0x04,		/* partitions smaller than 32MB */	FATHUGE		= 0x06,		/* fat16 partitions larger than 32MB */	FAT32		= 0x0b,	FAT32X		= 0x0c,	FATHUGEX	= 0x0e,	DMDDO		= 0x54, 	FATRESRV	= 2,		/* number of reserved fat entries */}; /* * dos boot sector, the start of every dos partition */struct Dosboot{	uchar	magic[3];	uchar	version[8];	uchar	sectsize[2];	uchar	clustsize;	uchar	nresrv[2];	uchar	nfats;	uchar	rootsize[2];	uchar	volsize[2];	uchar	mediadesc;	uchar	fatsize[2];	uchar	trksize[2];	uchar	nheads[2];	uchar	nhidden[4];	uchar	bigvolsize[4];		/* same as Dosboot32 up to here */	uchar	driveno;	uchar	reserved0;	uchar	bootsig;	uchar	volid[4];	uchar	label[11];	uchar	reserved1[8];}; /* * dos boot sector for FAT32 */enum{	NOFATMIRROR	= 0x0080,	/* masks for extflags */	ACTFATMASK	= 0x000f,}; struct Dosboot32{	uchar	magic[3];	uchar	version[8];	uchar	sectsize[2];	uchar	clustsize;	uchar	nresrv[2];	uchar	nfats;	uchar	rootsize[2];	uchar	volsize[2];	uchar	mediadesc;	uchar	fatsize[2];	uchar	trksize[2];	uchar	nheads[2];	uchar	nhidden[4];	uchar	bigvolsize[4];		/* same as Dosboot up to here */	uchar	fatsize32[4];		/* sectors per fat */	uchar	extflags[2];		/* active fat flags */	uchar	version1[2];		/* fat32 version; major & minor bytes */	uchar	rootstart[4];		/* starting cluster of root dir */	uchar	infospec[2];		/* fat allocation info sector */	uchar	backupboot[2];		/* backup boot sector */	uchar	reserved[12];}; /* * optional FAT32 info sector */enum{	FATINFOSIG1	= 0x41615252UL,	FATINFOSIG	= 0x61417272UL,}; struct Fatinfo{	uchar	sig1[4];	uchar	pad[480];	uchar	sig[4];	uchar	freeclust[4];	/* num frre clusters; -1 is unknown */	uchar	nextfree[4];	/* most recently allocated cluster */	uchar	resrv[4*3];}; /* * BIOS paramater block */struct Dosbpb{	MLock;				/* access to fat */	int	sectsize;		/* in bytes */	int	clustsize;		/* in sectors */	int	nresrv;			/* sectors */	int	nfats;			/* usually 2; modified to 1 if fat mirroring disabled */	int	rootsize;		/* number of entries, for fat12 and fat16 */	long	volsize;		/* in sectors */	int	mediadesc;	long	fatsize;		/* in sectors */	int	fatclusters;	int	fatbits;		/* 12, 16, or 32 */	long	fataddr;		/* sector number of first valid fat entry */	long	rootaddr;		/* for fat16 or fat12, sector of root dir */	long	rootstart;		/* for fat32, cluster of root dir */	long	dataaddr;		/* initial sector of data clusters */	long	freeptr;		/* next free cluster candidate */	long	freeclusters;		/* count of free clusters, for fat32 */	int	fatinfo;		/* fat info sector location; 0 => none */}; enum{	DOSDIRSIZE	= 32,	DOSEMPTY	= 0xe5,			/* first char in name if entry is unused */	DOSRUNE		= 13,			/* runes per dosdir in a long file name */	DOSNAMELEN	= 261			/* max dos file name length */}; struct Dosdir{	uchar	name[8];	uchar	ext[3];	uchar	attr;	uchar	reserved[1];	uchar	ctime[3];		/* creation time */	uchar	cdate[2];		/* creation date */	uchar	adate[2];		/* last access date */	uchar	hstart[2];		/* high bits of start for fat32 */	uchar	time[2];		/* last modified time */	uchar	date[2];		/* last modified date */	uchar	start[2];	uchar	length[4];}; enum{	DRONLY		= 0x01,	DHIDDEN		= 0x02,	DSYSTEM		= 0x04,	DVLABEL		= 0x08,	DDIR		= 0x10,	DARCH		= 0x20,}; #define	GSHORT(p)	(((p)[0])|(p)[1]<<8)#define	GLONG(p)	(((long)(p)[0])|(p)[1]<<8|(p)[2]<<16|(p)[3]<<24)#define PSHORT(p,v)	((p)[0]=(v),(p)[1]=(v)>>8)#define PLONG(p,v)	((p)[0]=(v),(p)[1]=(v)>>8,(p)[2]=(v)>>16,(p)[3]=(v)>>24) struct Dosptr{	ulong	addr;		/* sector & entry within of file's directory entry */	ulong	offset;	ulong	paddr;		/* of parent's directory entry */	ulong	poffset;	ulong	iclust;		/* ordinal within file */	ulong	clust;	ulong	naddr;		/* next block in directory (for writing multi entry elements) */	ulong	prevaddr;	Iosect *p;	Dosdir *d;}; #define	QIDPATH(p)	((p)->addr*(Sectorsize/DOSDIRSIZE) + \			 (p)->offset/DOSDIRSIZE) struct Xfs{	Xfs	*next;	int omode;		/* of file containing external fs */	char	*name;		/* of file containing external f.s. */	Qid	qid;		/* of file containing external f.s. */	long	ref;		/* attach count */	Qid	rootqid;	/* of plan9 constructed root directory */	uchar	isfat32;	/* is a fat 32 file system? */	short	dev;	short	fmt;	long	offset;	void	*ptr;}; struct Xfile{	Xfile	*next;		/* in hash bucket */	long	fid;	ulong	flags;	Qid	qid;	Xfs	*xf;	Dosptr	*ptr;}; enum{	Asis, Clean, Clunk}; enum{	Invalid, Short, ShortLower, Long}; enum{	/* Xfile flags */	Oread = 1,	Owrite = 2,	Orclose = 4,	Omodes = 3,}; enum{	Enevermind,	Eformat,	Eio,	Enoauth,	Enomem,	Enonexist,	Eperm,	Enofilsys,	Eauth,	Econtig,	Ebadfcall,	Ebadstat,	Eversion,	Etoolong,	Eerrstr,	ESIZE}; extern int	chatty;extern int	errno;extern int	readonly;extern char	*deffile;extern int trspaces;