85 lines
2 KiB
C
85 lines
2 KiB
C
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/* fat12 */
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#ifndef _FAT12_H
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#define _FAT12_H
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struct __attribute__((__packed__)) bpb {
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uint8_t jmp[3]; /* presumably some machine code */
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char oem_id[8];
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uint16_t sect_size;
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uint8_t sect_per_cluster;
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uint16_t resv_sect;
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uint8_t fat_ct;
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uint16_t dirent_ct;
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uint16_t sect_ct;
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uint8_t media_type;
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uint16_t fat_size;
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uint16_t track_size;
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uint16_t heads;
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uint32_t hidden_sect;
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uint32_t larg_sect_ct;
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/*
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* XXX: Most PC98 disks don't seem to have the extended
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* BPB. Should we even care about these?
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*/
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uint8_t drive_num;
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uint8_t _reserved;
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uint8_t signature;
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uint32_t serial_num;
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char label[11];
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char sys_id[8];
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};
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struct __attribute__((__packed__)) dos_dirent {
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char filename[11];
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uint8_t attributes;
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#define ATTR_READONLY 0x01
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#define ATTR_HIDDEN 0x02
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#define ATTR_SYSTEM 0x04
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#define ATTR_VOLID 0x08
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#define ATTR_ISDIR 0x10
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#define ATTR_ARCHIVE 0x20
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#define ATTR_LFN (ATTR_READONLY|ATTR_HIDDEN|ATTR_SYSTEM|ATTR_VOLID)
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uint8_t _reserved;
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uint8_t creation_time_tenths;
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uint16_t creation_time;
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uint16_t creation_date;
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uint16_t access_date;
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uint16_t high_loc; /* only used with FAT32 */
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uint16_t mod_time;
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uint16_t mod_date;
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uint16_t low_loc; /* entry cluster location */
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uint32_t size;
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};
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#define FAT12_MAX_CLUSTERS 4085
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#define FAT16_MAX_CLUSTERS 65525
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typedef struct dosfs_t {
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struct bpb ib;
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unsigned int fs_ver;
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int ifd;
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unsigned int root_loc;
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unsigned int root_size;
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unsigned int data_loc;
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unsigned int data_size;
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} dosfs_t;
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typedef struct dosfile_t {
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struct dos_dirent ent;
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char fname[9];
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char fext[4];
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struct dosfile_t *next;
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} dosfile_t;
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int open_image(const char *, int, dosfs_t *);
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void close_image(dosfs_t *);
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dosfile_t *dos_listdir(dosfs_t *, unsigned int);
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int dos_fread(dosfs_t *, dosfile_t *, void *, int);
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void dos_freedir(dosfile_t *);
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#endif /* !_FAT12_H */
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