265 lines
6.2 KiB
C
265 lines
6.2 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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typedef struct Dosboot Dosboot;
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typedef struct Dosboot32 Dosboot32;
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typedef struct Dosbpb Dosbpb;
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typedef struct Dosdir Dosdir;
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typedef struct Dospart Dospart;
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typedef struct Dosptr Dosptr;
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typedef struct Fatinfo Fatinfo;
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typedef struct Xfs Xfs;
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typedef struct Xfile Xfile;
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struct Dospart{
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unsigned char active;
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unsigned char hstart;
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unsigned char cylstart[2];
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unsigned char type;
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unsigned char hend;
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unsigned char cylend[2];
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unsigned char start[4];
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unsigned char length[4];
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};
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enum
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{
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/*
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* dos partition types
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*/
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FAT12 = 0x01,
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FAT16 = 0x04, /* partitions smaller than 32MB */
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FATHUGE = 0x06, /* fat16 partitions larger than 32MB */
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FAT32 = 0x0b,
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FAT32X = 0x0c,
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FATHUGEX = 0x0e,
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DMDDO = 0x54,
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FATRESRV = 2, /* number of reserved fat entries */
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};
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/*
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* dos boot sector, the start of every dos partition
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*/
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struct Dosboot{
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unsigned char magic[3];
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unsigned char version[8];
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unsigned char sectsize[2];
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unsigned char clustsize;
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unsigned char nresrv[2];
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unsigned char nfats;
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unsigned char rootsize[2];
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unsigned char volsize[2];
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unsigned char mediadesc;
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unsigned char fatsize[2];
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unsigned char trksize[2];
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unsigned char nheads[2];
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unsigned char nhidden[4];
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unsigned char bigvolsize[4]; /* same as Dosboot32 up to here */
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unsigned char driveno;
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unsigned char reserved0;
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unsigned char bootsig;
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unsigned char volid[4];
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unsigned char label[11];
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unsigned char reserved1[8];
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};
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/*
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* dos boot sector for FAT32
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*/
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enum
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{
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NOFATMIRROR = 0x0080, /* masks for extflags */
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ACTFATMASK = 0x000f,
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};
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struct Dosboot32{
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unsigned char magic[3];
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unsigned char version[8];
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unsigned char sectsize[2];
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unsigned char clustsize;
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unsigned char nresrv[2];
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unsigned char nfats;
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unsigned char rootsize[2];
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unsigned char volsize[2];
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unsigned char mediadesc;
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unsigned char fatsize[2];
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unsigned char trksize[2];
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unsigned char nheads[2];
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unsigned char nhidden[4];
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unsigned char bigvolsize[4]; /* same as Dosboot up to here */
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unsigned char fatsize32[4]; /* sectors per fat */
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unsigned char extflags[2]; /* active fat flags */
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unsigned char version1[2]; /* fat32 version; major & minor bytes */
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unsigned char rootstart[4]; /* starting cluster of root dir */
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unsigned char infospec[2]; /* fat allocation info sector */
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unsigned char backupboot[2]; /* backup boot sector */
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unsigned char reserved[12];
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};
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/*
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* optional FAT32 info sector
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*/
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enum
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{
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FATINFOSIG1 = 0x41615252UL,
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FATINFOSIG = 0x61417272UL,
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};
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struct Fatinfo
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{
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unsigned char sig1[4];
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unsigned char pad[480];
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unsigned char sig[4];
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unsigned char freeclust[4]; /* num frre clusters; -1 is unknown */
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unsigned char nextfree[4]; /* most recently allocated cluster */
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unsigned char resrv[4*3];
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};
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/*
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* BIOS paramater block
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*/
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struct Dosbpb{
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MLock; /* access to fat */
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int sectsize; /* in bytes */
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int clustsize; /* in sectors */
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int nresrv; /* sectors */
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int nfats; /* usually 2; modified to 1 if fat mirroring disabled */
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int rootsize; /* number of entries, for fat12 and fat16 */
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int32_t volsize; /* in sectors */
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int mediadesc;
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int32_t fatsize; /* in sectors */
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int fatclusters;
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int fatbits; /* 12, 16, or 32 */
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int32_t fataddr; /* sector number of first valid fat entry */
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int32_t rootaddr; /* for fat16 or fat12, sector of root dir */
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int32_t rootstart; /* for fat32, cluster of root dir */
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int32_t dataaddr; /* initial sector of data clusters */
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int32_t freeptr; /* next free cluster candidate */
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int32_t freeclusters; /* count of free clusters, for fat32 */
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int fatinfo; /* fat info sector location; 0 => none */
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};
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enum
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{
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DOSDIRSIZE = 32,
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DOSEMPTY = 0xe5, /* first char in name if entry is unused */
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DOSRUNE = 13, /* runes per dosdir in a int32_t file name */
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DOSNAMELEN = 261 /* max dos file name length */
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};
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struct Dosdir{
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unsigned char name[8];
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unsigned char ext[3];
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unsigned char attr;
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unsigned char reserved[1];
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unsigned char ctime[3]; /* creation time */
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unsigned char cdate[2]; /* creation date */
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unsigned char adate[2]; /* last access date */
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unsigned char hstart[2]; /* high bits of start for fat32 */
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unsigned char time[2]; /* last modified time */
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unsigned char date[2]; /* last modified date */
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unsigned char start[2];
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unsigned char length[4];
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};
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enum
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{
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DRONLY = 0x01,
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DHIDDEN = 0x02,
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DSYSTEM = 0x04,
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DVLABEL = 0x08,
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DDIR = 0x10,
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DARCH = 0x20,
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};
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#define GSHORT(p) (((p)[0])|(p)[1]<<8)
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#define GLONG(p) (((int32_t)(p)[0])|(p)[1]<<8|(p)[2]<<16|(p)[3]<<24)
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#define PSHORT(p,v) ((p)[0]=(v),(p)[1]=(v)>>8)
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#define PLONG(p,v) ((p)[0]=(v),(p)[1]=(v)>>8,(p)[2]=(v)>>16,(p)[3]=(v)>>24)
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struct Dosptr{
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uint32_t addr; /* sector & entry within of file's directory entry */
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uint32_t offset;
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uint32_t paddr; /* of parent's directory entry */
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uint32_t poffset;
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uint32_t iclust; /* ordinal within file */
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uint32_t clust;
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uint32_t naddr; /* next block in directory (for writing multi entry elements) */
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uint32_t prevaddr;
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Iosect *p;
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Dosdir *d;
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};
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#define QIDPATH(p) ((p)->addr*(Sectorsize/DOSDIRSIZE) + \
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(p)->offset/DOSDIRSIZE)
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struct Xfs{
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Xfs *next;
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int omode; /* of file containing external fs */
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char *name; /* of file containing external f.s. */
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Qid qid; /* of file containing external f.s. */
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int32_t ref; /* attach count */
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Qid rootqid; /* of plan9 constructed root directory */
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unsigned char isfat32; /* is a fat 32 file system? */
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short dev;
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short fmt;
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int32_t offset;
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void *ptr;
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};
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struct Xfile{
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Xfile *next; /* in hash bucket */
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int32_t fid;
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uint32_t flags;
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Qid qid;
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Xfs *xf;
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Dosptr *ptr;
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};
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enum{
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Asis, Clean, Clunk
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};
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enum{
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Invalid, Short, ShortLower, Long
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};
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enum{ /* Xfile flags */
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Oread = 1,
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Owrite = 2,
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Orclose = 4,
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Omodes = 3,
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};
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enum{
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Enevermind,
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Eformat,
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Eio,
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Enoauth,
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Enomem,
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Enonexist,
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Eperm,
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Enofilsys,
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Eauth,
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Econtig,
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Ebadfcall,
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Ebadstat,
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Eversion,
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Etoolong,
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Eerrstr,
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ESIZE
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};
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extern int chatty;
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extern int errno;
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extern int readonly;
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extern char *deffile;
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extern int trspaces;
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