Subversion Repositories planix.SVN

typedef struct Dosboot  Dosboot;
typedef struct Dos      Dos;
typedef struct Dosdir   Dosdir;
typedef struct Dosfile  Dosfile;
typedef struct Dospart  Dospart;
typedef struct File File;
typedef struct Bootfs Bootfs;

int fsread(File *file, void *a, long n);
int fsboot(Bootfs *fs, char *path, Boot *b);
int fswalk(Bootfs *fs, char *path, File *f);

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 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;
};

typedef struct Dosboot Dosboot;
typedef struct Dosdir Dosdir;

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];
/* fat 32 */
        uchar   bigfatsize[4];
        uchar   extflags[2];
        uchar   fsversion[2];
        uchar   rootdirstartclust[4];
        uchar   fsinfosect[2];
        uchar   backupbootsect[2];
/* ???
        uchar   driveno;
        uchar   reserved0;
        uchar   bootsig;
        uchar   volid[4];
        uchar   label[11];
        uchar   reserved1[8];
*/
};

struct Dosdir{
        uchar   name[8];
        uchar   ext[3];
        uchar   attr;
        uchar   lowercase;
        uchar   hundredth;
        uchar   ctime[2];
        uchar   cdate[2];
        uchar   adate[2];
        uchar   highstart[2];
        uchar   mtime[2];
        uchar   mdate[2];
        uchar   start[2];
        uchar   length[4];
};

#define DOSRONLY        0x01
#define DOSHIDDEN       0x02
#define DOSSYSTEM       0x04
#define DOSVLABEL       0x08
#define DOSDIR  0x10
#define DOSARCH 0x20

// #pragma incomplete Bootfs

struct File{
        union{
                Dosfile dos;
                int walked;
        };
        Bootfs  *fs;
        char    *path;
};

struct Bootfs{
        union {
                Dos dos;
        };
        Chan    *devch;
        char    *disk;

        /* for *bios.c */
        int     dev;                            /* device id */
        long    (*diskread)(Bootfs*, void*, long);      /* disk read routine */
        vlong   (*diskseek)(Bootfs*, vlong);    /* disk seek routine */

        long    (*read)(File*, void*, long);
        int     (*walk)(File*, char*);
        File    root;
};

extern int      dosinit(Bootfs*, char *);

#define BADPTR(x) ((ulong)(x) < 0x80000000)