| /* ----------------------------------------------------------------------- * |
| * |
| * 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 */ |