1 #ident "$Id: fat.h,v 1.1 2004/12/15 10:14:39 hpa Exp $"
2 /* ----------------------------------------------------------------------- *
4 * Copyright 2001-2004 H. Peter Anvin - All Rights Reserved
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
9 * Boston MA 02111-1307, USA; either version 2 of the License, or
10 * (at your option) any later version; incorporated herein by reference.
12 * ----------------------------------------------------------------------- */
17 * Basic data structures for a FAT filesystem
25 /* The poor excuse FAT has for a superblock -- in the boot sector */
27 le8_t bsJump[3]; /* Jump to code */
28 char bsOemName[8]; /* Formatting program */
29 le16_t bsBytesPerSec; /* Bytes/sector */
30 le8_t bsSecPerClust; /* Sectors/cluster */
31 le16_t bsResSectors; /* Reserved sectors */
32 le8_t bsFATs; /* Number of FATs */
33 le16_t bsRootDirEnts; /* Number of entries/root directory */
34 le16_t bsSectors; /* Number of sectors [1] */
35 le8_t bsMedia; /* Magic media type byte */
36 le16_t bsFATsecs; /* Sectors/FAT */
37 le16_t bsSecPerTrack; /* Sectors/track */
38 le16_t bsHeads; /* Number of heads */
39 le32_t bsHiddenSecs; /* Number of hidden sectors */
40 le32_t bsHugeSectors; /* Number of sectors [2] */
44 le8_t bsDriveNumber; /* Drive number */
45 le8_t bsReserved1; /* Reserved */
46 le8_t bsBootSignature; /* 0x29 */
47 le32_t bsVolumeID; /* Volume serial number */
48 char bsVolumeLabel[11]; /* Volume name */
49 char bsFileSysType[8]; /* File system type */
51 le8_t bsCode[448]; /* Boot sector code */
56 le32_t bpb_fatsz32; /* Sectors/FAT */
57 le16_t bpb_extflags; /* Extended flags */
58 le16_t bpb_fsver; /* Filesystem version */
59 le32_t bpb_rootclus; /* Root directory cluster */
60 le16_t bpb_fsinfo; /* FSINFO sector number */
61 le16_t bpb_bkbootsec; /* Backup boot sector (superblock) */
62 char bpb_reserved[12];
64 /* Same shit, different offset! */
65 le8_t bsDriveNumber; /* Drive number */
66 le8_t bsReserved1; /* Reserved */
67 le8_t bsBootSignature; /* 0x29 */
68 le32_t bsVolumeID; /* Volume serial number */
69 char bsVolumeLabel[11]; /* Volume name */
70 char bsFileSysType[8]; /* File system type */
72 le8_t bsCode[420]; /* Boot sector code */
76 le16_t bsSignature; /* 0xAA55 */
79 #define BS_BOOTSIGNATURE 0x29
80 #define BS_SIGNATURE 0xAA55
82 /* A FAT filesystem directory entry */
86 le8_t name[11]; /* Mangled filename */
87 le8_t attribute; /* File type/attribute */
88 le8_t caseflags; /* VFAT: case for basis and extension */
89 le8_t ctime_ms; /* ms of creation time */
90 le32_t ctime; /* Creation time */
91 le16_t atime; /* Date portion (high 16 bits) of atime */
92 le16_t clusthi; /* FAT32: high 16 bits of cluster */
93 le32_t mtime; /* Modification time */
94 le16_t clustlo; /* First cluster pointer */
95 le32_t size; /* File size (bytes) */
98 /* A VFAT filesystem continuation entry */
101 le8_t id; /* Sequence number for slot */
102 le16_t name0[5]; /* 5 characters */
103 le8_t attribute; /* Attribute byte */
104 le8_t reserved; /* Reserved, MBZ */
105 le8_t alias_csum; /* Short name checksum */
106 le16_t name5[6]; /* 6 characters */
107 le16_t firstclust; /* MBZ */
108 le16_t name11[2]; /* 2 characters */