132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
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/*++
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Copyright (c) 1998 Intel Corporation
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Module Name:
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fat.h
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Abstract:
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On disk fat structures
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Revision History
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--*/
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typedef enum {
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FAT12,
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FAT16,
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FAT32,
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FatUndefined
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} FAT_VOLUME_TYPE;
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#pragma pack(1)
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/*
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* Used for fat12 & fat16
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*/
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typedef struct {
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UINT8 Ia32Jump[3];
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CHAR8 OemId[8];
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UINT16 SectorSize;
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UINT8 SectorsPerCluster;
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UINT16 ReservedSectors;
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UINT8 NoFats;
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UINT16 RootEntries; /* < FAT32, root dir is fixed size */
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UINT16 Sectors;
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UINT8 Media; /* (ignored) */
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UINT16 SectorsPerFat; /* < FAT32 */
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UINT16 SectorsPerTrack; /* (ignored) */
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UINT16 Heads; /* (ignored) */
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UINT32 HiddenSectors; /* (ignored) */
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UINT32 LargeSectors; /* => FAT32 */
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UINT8 PhysicalDriveNumber; /* (ignored) */
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UINT8 CurrentHead; /* holds boot_sector_dirty bit */
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UINT8 Signature; /* (ignored) */
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CHAR8 Id[4];
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CHAR8 FatLabel[11];
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CHAR8 SystemId[8];
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} FAT_BOOT_SECTOR;
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typedef struct {
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UINT8 Ia32Jump[3];
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CHAR8 OemId[8];
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UINT16 SectorSize;
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UINT8 SectorsPerCluster;
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UINT16 ReservedSectors;
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UINT8 NoFats;
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UINT16 RootEntries; /* < FAT32, root dir is fixed size */
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UINT16 Sectors;
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UINT8 Media; /* (ignored) */
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UINT16 SectorsPerFat; /* < FAT32 */
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UINT16 SectorsPerTrack; /* (ignored) */
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UINT16 Heads; /* (ignored) */
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UINT32 HiddenSectors; /* (ignored) */
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UINT32 LargeSectors; /* Used if Sectors==0 */
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UINT32 LargeSectorsPerFat; /* FAT32 */
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UINT16 ExtendedFlags; /* FAT32 (ignored) */
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UINT16 FsVersion; /* FAT32 (ignored) */
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UINT32 RootDirFirstCluster; /* FAT32 */
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UINT16 FsInfoSector; /* FAT32 */
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UINT16 BackupBootSector; /* FAT32 */
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UINT8 Reserved[12]; /* FAT32 (ignored) */
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UINT8 PhysicalDriveNumber; /* (ignored) */
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UINT8 CurrentHead; /* holds boot_sector_dirty bit */
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UINT8 Signature; /* (ignored) */
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CHAR8 Id[4];
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CHAR8 FatLabel[11];
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CHAR8 SystemId[8];
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} FAT_BOOT_SECTOR_EX;
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/*
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* ignored - means not used in the EFI driver
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*
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* For <Fat32 RootEntries indicates the number of entries in the root directory,
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* and SectorsPerFat is used to size the fact table
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*/
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typedef struct {
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UINT16 Day:5;
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UINT16 Month:4;
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UINT16 Year:7; /* From 1980 */
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} FAT_DATE;
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typedef struct {
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UINT16 DoubleSecond:5;
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UINT16 Minute:6;
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UINT16 Hour:5;
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} FAT_TIME;
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typedef struct {
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FAT_TIME Time;
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FAT_DATE Date;
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} FAT_DATE_TIME;
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typedef struct {
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CHAR8 FileName[11]; /* 8.3 filename */
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UINT8 Attributes;
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UINT8 CaseFlag;
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UINT8 CreateMillisecond; /* (creation milliseconds - ignored) */
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FAT_DATE_TIME FileCreateTime;
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FAT_DATE FileLastAccess;
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UINT16 FileClusterHigh; /* >= FAT32 */
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FAT_DATE_TIME FileModificationTime;
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UINT16 FileCluster;
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UINT32 FileSize;
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} FAT_DIRECTORY_ENTRY;
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#pragma pack()
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