mirror of https://github.com/acidanthera/audk.git
139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/** @file
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FAT format data structures
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Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _FAT_FMT_H_
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#define _FAT_FMT_H_
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//
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// Definitions
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//
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#define FAT_ATTR_READ_ONLY 0x01
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#define FAT_ATTR_HIDDEN 0x02
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#define FAT_ATTR_SYSTEM 0x04
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#define FAT_ATTR_VOLUME_ID 0x08
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#define FAT_ATTR_DIRECTORY 0x10
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#define FAT_ATTR_ARCHIVE 0x20
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#define FAT_ATTR_LFN (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID)
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#define FAT_CLUSTER_SPECIAL ((MAX_UINT32 &~0xF) | 0x7)
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#define FAT_CLUSTER_FREE 0
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#define FAT_CLUSTER_RESERVED (FAT_CLUSTER_SPECIAL)
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#define FAT_CLUSTER_BAD (FAT_CLUSTER_SPECIAL)
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#define FAT_CLUSTER_LAST (-1)
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#define DELETE_ENTRY_MARK 0xE5
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#define EMPTY_ENTRY_MARK 0x00
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#define FAT_CLUSTER_FUNCTIONAL(Cluster) (((Cluster) == 0) || ((Cluster) >= FAT_CLUSTER_SPECIAL))
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#define FAT_CLUSTER_END_OF_CHAIN(Cluster) ((Cluster) > (FAT_CLUSTER_SPECIAL))
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//
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// Directory Entry
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//
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#pragma pack(1)
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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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//
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// Boot Sector
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//
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#pragma pack(1)
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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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} PEI_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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} PEI_FAT_BOOT_SECTOR_EX;
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#pragma pack()
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#endif
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