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/** @file
Definitions for on-disk FAT structures.
Copyright (c) 2005 - 2017, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _FATFILESYSTEM_H_
#define _FATFILESYSTEM_H_
#pragma pack(1)
//
// FAT info signature
//
#define FAT_INFO_SIGNATURE 0x41615252
#define FAT_INFO_BEGIN_SIGNATURE 0x61417272
#define FAT_INFO_END_SIGNATURE 0xAA550000
//
// FAT entry values
//
#define FAT_CLUSTER_SPECIAL_EXT (MAX_UINTN & (~0xF))
#define FAT_CLUSTER_SPECIAL ((FAT_CLUSTER_SPECIAL_EXT) | 0x07)
#define FAT_CLUSTER_FREE 0
#define FAT_CLUSTER_RESERVED (FAT_CLUSTER_SPECIAL)
#define FAT_CLUSTER_BAD (FAT_CLUSTER_SPECIAL)
#define FAT_CLUSTER_LAST (-1)
#define FAT_END_OF_FAT_CHAIN(Cluster) ((Cluster) > (FAT_CLUSTER_SPECIAL))
#define FAT_MIN_CLUSTER 2
#define FAT_MAX_FAT12_CLUSTER 0xFF5
#define FAT_MAX_FAT16_CLUSTER 0xFFF5
#define FAT_CLUSTER_SPECIAL_FAT12 0xFF7
#define FAT_CLUSTER_SPECIAL_FAT16 0xFFF7
#define FAT_CLUSTER_SPECIAL_FAT32 0x0FFFFFF7
#define FAT_CLUSTER_MASK_FAT12 0xFFF
#define FAT_CLUSTER_UNMASK_FAT12 0xF000
#define FAT_CLUSTER_MASK_FAT32 0x0FFFFFFF
#define FAT_CLUSTER_UNMASK_FAT32 0xF0000000
#define FAT_POS_FAT12(a) ((a) * 3 / 2)
#define FAT_POS_FAT16(a) ((a) * 2)
#define FAT_POS_FAT32(a) ((a) * 4)
#define FAT_ODD_CLUSTER_FAT12(a) (((a) & 1) != 0)
//
// FAT attribute define
//
#define FAT_ATTRIBUTE_READ_ONLY 0x01
#define FAT_ATTRIBUTE_HIDDEN 0x02
#define FAT_ATTRIBUTE_SYSTEM 0x04
#define FAT_ATTRIBUTE_VOLUME_ID 0x08
#define FAT_ATTRIBUTE_DIRECTORY 0x10
#define FAT_ATTRIBUTE_ARCHIVE 0x20
#define FAT_ATTRIBUTE_DEVICE 0x40
#define FAT_ATTRIBUTE_LFN 0x0F
//
// Some Long File Name definitions
//
#define FAT_LFN_LAST 0x40 // Ordinal field
#define MAX_LFN_ENTRIES 20
#define LFN_CHAR1_LEN 5
#define LFN_CHAR2_LEN 6
#define LFN_CHAR3_LEN 2
#define LFN_CHAR_TOTAL (LFN_CHAR1_LEN + LFN_CHAR2_LEN + LFN_CHAR3_LEN)
#define LFN_ENTRY_NUMBER(a) (((a) + LFN_CHAR_TOTAL - 1) / LFN_CHAR_TOTAL)
//
// Some 8.3 File Name definitions
//
#define FAT_MAIN_NAME_LEN 8
#define FAT_EXTEND_NAME_LEN 3
#define FAT_NAME_LEN (FAT_MAIN_NAME_LEN + FAT_EXTEND_NAME_LEN)
//
// Some directory entry information
//
#define FAT_ENTRY_INFO_OFFSET 13
#define DELETE_ENTRY_MARK 0xE5
#define EMPTY_ENTRY_MARK 0x00
//
// Volume dirty Mask
//
#define FAT16_DIRTY_MASK 0x7fff
#define FAT32_DIRTY_MASK 0xf7ffffff
//
// internal flag
//
#define FAT_CASE_MIXED 0x01
#define FAT_CASE_NAME_LOWER 0x08
#define FAT_CASE_EXT_LOWER 0x10
typedef struct {
UINT8 Ia32Jump[3];
CHAR8 OemId[8];
UINT16 SectorSize;
UINT8 SectorsPerCluster;
UINT16 ReservedSectors;
UINT8 NumFats;
UINT16 RootEntries; // < FAT32, root dir is fixed size
UINT16 Sectors;
UINT8 Media;
UINT16 SectorsPerFat; // < FAT32
UINT16 SectorsPerTrack; // (ignored)
UINT16 Heads; // (ignored)
UINT32 HiddenSectors; // (ignored)
UINT32 LargeSectors; // Used if Sectors==0
} FAT_BOOT_SECTOR_BASIC;
typedef struct {
UINT8 PhysicalDriveNumber; // (ignored)
UINT8 CurrentHead; // holds boot_sector_dirty bit
UINT8 Signature; // (ignored)
CHAR8 Id[4];
CHAR8 FatLabel[11];
CHAR8 SystemId[8];
} FAT_BOOT_SECTOR_EXT;
typedef struct {
UINT32 LargeSectorsPerFat; // FAT32
UINT16 ExtendedFlags; // FAT32 (ignored)
UINT16 FsVersion; // FAT32 (ignored)
UINT32 RootDirFirstCluster; // FAT32
UINT16 FsInfoSector; // FAT32
UINT16 BackupBootSector; // FAT32
UINT8 Reserved[12]; // FAT32 (ignored)
UINT8 PhysicalDriveNumber; // (ignored)
UINT8 CurrentHead; // holds boot_sector_dirty bit
UINT8 Signature; // (ignored)
CHAR8 Id[4];
CHAR8 FatLabel[11];
CHAR8 SystemId[8];
} FAT32_BOOT_SECTOR_EXT;
typedef union {
FAT_BOOT_SECTOR_EXT FatBse;
FAT32_BOOT_SECTOR_EXT Fat32Bse;
} FAT_BSE;
typedef struct {
FAT_BOOT_SECTOR_BASIC FatBsb;
FAT_BSE FatBse;
} FAT_BOOT_SECTOR;
//
// FAT Info Structure
//
typedef struct {
UINT32 ClusterCount;
UINT32 NextCluster;
} FAT_FREE_INFO;
typedef struct {
UINT32 Signature;
UINT8 ExtraBootCode[480];
UINT32 InfoBeginSignature;
FAT_FREE_INFO FreeInfo;
UINT8 Reserved[12];
UINT32 InfoEndSignature;
} FAT_INFO_SECTOR;
//
// Directory Entry
//
#define FAT_MAX_YEAR_FROM_1980 0x7f
typedef struct {
UINT16 Day : 5;
UINT16 Month : 4;
UINT16 Year : 7; // From 1980
} FAT_DATE;
typedef struct {
UINT16 DoubleSecond : 5;
UINT16 Minute : 6;
UINT16 Hour : 5;
} FAT_TIME;
typedef struct {
FAT_TIME Time;
FAT_DATE Date;
} FAT_DATE_TIME;
typedef struct {
CHAR8 FileName[11]; // 8.3 filename
UINT8 Attributes;
UINT8 CaseFlag;
UINT8 CreateMillisecond; // (creation milliseconds - ignored)
FAT_DATE_TIME FileCreateTime;
FAT_DATE FileLastAccess;
UINT16 FileClusterHigh; // >= FAT32
FAT_DATE_TIME FileModificationTime;
UINT16 FileCluster;
UINT32 FileSize;
} FAT_DIRECTORY_ENTRY;
typedef struct {
UINT8 Ordinal;
CHAR8 Name1[10]; // (Really 5 chars, but not WCHAR aligned)
UINT8 Attributes;
UINT8 Type;
UINT8 Checksum;
CHAR16 Name2[6];
UINT16 MustBeZero;
CHAR16 Name3[2];
} FAT_DIRECTORY_LFN;
#pragma pack()
#endif
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