Subversion Repositories planix.SVN

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;