ref: 1ccd0cd04d75840861e26f6c5f6ac73396d43d8a
dir: /sys/src/cmd/dossrv/dat.h/
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 */ vlong volsize; /* in sectors */ int mediadesc; vlong fatsize; /* in sectors */ long fatclusters; int fatbits; /* 12, 16, or 32 */ vlong fataddr; /* sector number of first valid fat entry */ vlong rootaddr; /* for fat16 or fat12, sector of root dir */ vlong dataaddr; /* initial sector of data clusters */ long rootstart; /* for fat32, cluster of root dir */ long freeptr; /* next free cluster candidate */ long freeclusters; /* count of free clusters, for fat32 */ vlong 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 */ MAXFILELEN = 0xFFFFFFFFUL, }; struct Dosdir{ uchar name[8]; uchar ext[3]; uchar attr; uchar reserved[1]; uchar ctimetenth; uchar ctime[2]; /* 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) (((ushort)(p)[0])|(ushort)(p)[1]<<8) #define GLONG(p) (((ulong)(p)[0])|(ulong)(p)[1]<<8|(ulong)(p)[2]<<16|(ulong)(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{ vlong addr; /* sector & entry within of file's directory entry */ vlong paddr; /* of parent's directory entry */ ulong offset; ulong poffset; ulong iclust; /* ordinal within file */ ulong clust; vlong naddr; /* next block in directory (for writing multi entry elements) */ vlong 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; vlong 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;