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Diffstat (limited to 'FatPkg/EnhancedFatDxe/FatFileSystem.h')
| -rw-r--r-- | FatPkg/EnhancedFatDxe/FatFileSystem.h | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/FatPkg/EnhancedFatDxe/FatFileSystem.h b/FatPkg/EnhancedFatDxe/FatFileSystem.h new file mode 100644 index 0000000000..d6fd8e46b3 --- /dev/null +++ b/FatPkg/EnhancedFatDxe/FatFileSystem.h @@ -0,0 +1,221 @@ +/*++
+
+Copyright (c) 2005, Intel Corporation
+All rights reserved. This program and the accompanying materials are licensed and made available
+under the terms and conditions of the BSD License which accompanies this
+distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+
+Module Name:
+
+ FatFileSystem.h
+
+Abstract:
+
+ Definitions for on-disk FAT structures
+
+Revision History
+
+--*/
+
+#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 (-1 & (~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 struct {
+ FAT_BOOT_SECTOR_BASIC FatBsb;
+ union {
+ FAT_BOOT_SECTOR_EXT FatBse;
+ FAT32_BOOT_SECTOR_EXT Fat32Bse;
+ } 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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