typedef struct Dosboot Dosboot; typedef struct Dos Dos; typedef struct Dosdir Dosdir; typedef struct Dosfile Dosfile; typedef struct Dospart Dospart; struct Dospart { uchar flag; /* active flag */ uchar shead; /* starting head */ uchar scs[2]; /* starting cylinder/sector */ uchar type; /* partition type */ uchar ehead; /* ending head */ uchar ecs[2]; /* ending cylinder/sector */ uchar start[4]; /* starting sector */ uchar len[4]; /* length in sectors */ }; #define FAT12 0x01 #define FAT16 0x04 #define FAT16EXT 0x0e #define EXTEND 0x05 #define FATHUGE 0x06 #define FAT32 0x0b #define FAT32X 0x0c #define EXTHUGE 0x0f #define DMDDO 0x54 #define PLAN9 0x39 #define LEXTEND 0x85 struct Dosfile{ Dos *dos; /* owning dos file system */ char name[8]; char ext[3]; uchar attr; long length; long pstart; /* physical start cluster address */ long pcurrent; /* physical current cluster address */ long lcurrent; /* logical current cluster address */ long offset; }; struct Dos{ long start; /* start of file system */ int sectsize; /* in bytes */ int clustsize; /* in sectors */ int clustbytes; /* in bytes */ int nresrv; /* sectors */ int nfats; /* usually 2 */ int rootsize; /* number of entries */ int volsize; /* in sectors */ int mediadesc; int fatsize; /* in sectors */ int fatclusters; int fatbits; /* 12 or 16 */ long fataddr; /* sector number */ long rootaddr; long rootclust; long dataaddr; long freeptr; }; extern int dosinit(Fs*);