Source code of Windows XP (NT5)
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/*++
Copyright (c) 1998 Intel Corporation
Module Name:
fat.h
Abstract:
On disk fat structures
Revision History
--*/
typedef enum { FAT12, FAT16, FAT32, FatUndefined} FAT_VOLUME_TYPE;
#pragma pack(1)
/*
* Used for fat12 & fat16 */
typedef struct { UINT8 Ia32Jump[3]; CHAR8 OemId[8];
UINT16 SectorSize; UINT8 SectorsPerCluster; UINT16 ReservedSectors; UINT8 NoFats; UINT16 RootEntries; /* < FAT32, root dir is fixed size */ UINT16 Sectors; UINT8 Media; /* (ignored) */ UINT16 SectorsPerFat; /* < FAT32 */ UINT16 SectorsPerTrack; /* (ignored) */ UINT16 Heads; /* (ignored) */ UINT32 HiddenSectors; /* (ignored) */ UINT32 LargeSectors; /* => FAT32 */ 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;
typedef struct { UINT8 Ia32Jump[3]; CHAR8 OemId[8];
UINT16 SectorSize; UINT8 SectorsPerCluster; UINT16 ReservedSectors; UINT8 NoFats; UINT16 RootEntries; /* < FAT32, root dir is fixed size */ UINT16 Sectors; UINT8 Media; /* (ignored) */ UINT16 SectorsPerFat; /* < FAT32 */ UINT16 SectorsPerTrack; /* (ignored) */ UINT16 Heads; /* (ignored) */ UINT32 HiddenSectors; /* (ignored) */ UINT32 LargeSectors; /* Used if Sectors==0 */
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];} FAT_BOOT_SECTOR_EX;
/*
* ignored - means not used in the EFI driver * * For <Fat32 RootEntries indicates the number of entries in the root directory, * and SectorsPerFat is used to size the fact table */
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;
#pragma pack()
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