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/* ----------------------------------------------------------------------- *
*
* Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* fat.h
*
* Basic data structures for a FAT filesystem
*/
#ifndef FAT_H
#define FAT_H
#include "ulint.h"
/* The poor excuse FAT has for a superblock -- in the boot sector */
struct fat_bootsect {
le8_t bsJump[3]; /* Jump to code */
char bsOemName[8]; /* Formatting program */
le16_t bsBytesPerSec; /* Bytes/sector */
le8_t bsSecPerClust; /* Sectors/cluster */
le16_t bsResSectors; /* Reserved sectors */
le8_t bsFATs; /* Number of FATs */
le16_t bsRootDirEnts; /* Number of entries/root directory */
le16_t bsSectors; /* Number of sectors [1] */
le8_t bsMedia; /* Magic media type byte */
le16_t bsFATsecs; /* Sectors/FAT */
le16_t bsSecPerTrack; /* Sectors/track */
le16_t bsHeads; /* Number of heads */
le32_t bsHiddenSecs; /* Number of hidden sectors */
le32_t bsHugeSectors; /* Number of sectors [2] */
union {
/* FAT12/16 */
struct {
le8_t bsDriveNumber; /* Drive number */
le8_t bsReserved1; /* Reserved */
le8_t bsBootSignature; /* 0x29 */
le32_t bsVolumeID; /* Volume serial number */
char bsVolumeLabel[11]; /* Volume name */
char bsFileSysType[8]; /* File system type */
le8_t bsCode[448]; /* Boot sector code */
} fat16;
/* FAT32 */
struct {
le32_t bpb_fatsz32; /* Sectors/FAT */
le16_t bpb_extflags; /* Extended flags */
le16_t bpb_fsver; /* Filesystem version */
le32_t bpb_rootclus; /* Root directory cluster */
le16_t bpb_fsinfo; /* FSINFO sector number */
le16_t bpb_bkbootsec; /* Backup boot sector (superblock) */
char bpb_reserved[12];
/* Same shit, different offset! */
le8_t bsDriveNumber; /* Drive number */
le8_t bsReserved1; /* Reserved */
le8_t bsBootSignature; /* 0x29 */
le32_t bsVolumeID; /* Volume serial number */
char bsVolumeLabel[11]; /* Volume name */
char bsFileSysType[8]; /* File system type */
le8_t bsCode[420]; /* Boot sector code */
} fat32;
} u;
le16_t bsSignature; /* 0xAA55 */
};
#define BS_BOOTSIGNATURE 0x29
#define BS_SIGNATURE 0xAA55
/* A FAT filesystem directory entry */
struct fat_dirent {
le8_t name[11]; /* Mangled filename */
le8_t attribute; /* File type/attribute */
le8_t caseflags; /* VFAT: case for basis and extension */
le8_t ctime_ms; /* ms of creation time */
le32_t ctime; /* Creation time */
le16_t atime; /* Date portion (high 16 bits) of atime */
le16_t clusthi; /* FAT32: high 16 bits of cluster */
le32_t mtime; /* Modification time */
le16_t clustlo; /* First cluster pointer */
le32_t size; /* File size (bytes) */
};
/* A VFAT filesystem continuation entry */
struct fat_vfat_slot {
le8_t id; /* Sequence number for slot */
le16_t name0[5]; /* 5 characters */
le8_t attribute; /* Attribute byte */
le8_t reserved; /* Reserved, MBZ */
le8_t alias_csum; /* Short name checksum */
le16_t name5[6]; /* 6 characters */
le16_t firstclust; /* MBZ */
le16_t name11[2]; /* 2 characters */
};
#endif /* FAT_H */
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