mirror of
https://github.com/reactos/reactos.git
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0daa5547d9
This implies that a sample for W10. It has been backported to NT5.2; not sure how it would work on a W2K3 (feel free to test!)
755 lines
26 KiB
C
755 lines
26 KiB
C
/*++
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Copyright (c) 1989-2000 Microsoft Corporation
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Module Name:
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Fat.h
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Abstract:
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This module defines the on-disk structure of the Fat file system.
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--*/
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#ifndef _FAT_
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#define _FAT_
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//
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// The following nomenclature is used to describe the Fat on-disk
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// structure:
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//
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// LBN - is the number of a sector relative to the start of the disk.
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//
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// VBN - is the number of a sector relative to the start of a file,
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// directory, or allocation.
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//
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// LBO - is a byte offset relative to the start of the disk.
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//
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// VBO - is a byte offset relative to the start of a file, directory
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// or allocation.
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//
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typedef LONGLONG LBO; /* for Fat32, LBO is >32 bits */
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typedef LBO *PLBO;
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typedef ULONG32 VBO;
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typedef VBO *PVBO;
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//
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// The boot sector is the first physical sector (LBN == 0) on the volume.
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// Part of the sector contains a BIOS Parameter Block. The BIOS in the
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// sector is packed (i.e., unaligned) so we'll supply a unpacking macro
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// to translate a packed BIOS into its unpacked equivalent. The unpacked
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// BIOS structure is already defined in ntioapi.h so we only need to define
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// the packed BIOS.
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//
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//
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// Define the Packed and Unpacked BIOS Parameter Block
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//
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typedef struct _PACKED_BIOS_PARAMETER_BLOCK {
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UCHAR BytesPerSector[2]; // offset = 0x000 0
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UCHAR SectorsPerCluster[1]; // offset = 0x002 2
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UCHAR ReservedSectors[2]; // offset = 0x003 3
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UCHAR Fats[1]; // offset = 0x005 5
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UCHAR RootEntries[2]; // offset = 0x006 6
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UCHAR Sectors[2]; // offset = 0x008 8
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UCHAR Media[1]; // offset = 0x00A 10
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UCHAR SectorsPerFat[2]; // offset = 0x00B 11
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UCHAR SectorsPerTrack[2]; // offset = 0x00D 13
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UCHAR Heads[2]; // offset = 0x00F 15
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UCHAR HiddenSectors[4]; // offset = 0x011 17
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UCHAR LargeSectors[4]; // offset = 0x015 21
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} PACKED_BIOS_PARAMETER_BLOCK; // sizeof = 0x019 25
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typedef PACKED_BIOS_PARAMETER_BLOCK *PPACKED_BIOS_PARAMETER_BLOCK;
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typedef struct _PACKED_BIOS_PARAMETER_BLOCK_EX {
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UCHAR BytesPerSector[2]; // offset = 0x000 0
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UCHAR SectorsPerCluster[1]; // offset = 0x002 2
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UCHAR ReservedSectors[2]; // offset = 0x003 3
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UCHAR Fats[1]; // offset = 0x005 5
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UCHAR RootEntries[2]; // offset = 0x006 6
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UCHAR Sectors[2]; // offset = 0x008 8
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UCHAR Media[1]; // offset = 0x00A 10
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UCHAR SectorsPerFat[2]; // offset = 0x00B 11
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UCHAR SectorsPerTrack[2]; // offset = 0x00D 13
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UCHAR Heads[2]; // offset = 0x00F 15
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UCHAR HiddenSectors[4]; // offset = 0x011 17
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UCHAR LargeSectors[4]; // offset = 0x015 21
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UCHAR LargeSectorsPerFat[4]; // offset = 0x019 25
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UCHAR ExtendedFlags[2]; // offset = 0x01D 29
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UCHAR FsVersion[2]; // offset = 0x01F 31
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UCHAR RootDirFirstCluster[4]; // offset = 0x021 33
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UCHAR FsInfoSector[2]; // offset = 0x025 37
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UCHAR BackupBootSector[2]; // offset = 0x027 39
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UCHAR Reserved[12]; // offset = 0x029 41
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} PACKED_BIOS_PARAMETER_BLOCK_EX; // sizeof = 0x035 53
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typedef PACKED_BIOS_PARAMETER_BLOCK_EX *PPACKED_BIOS_PARAMETER_BLOCK_EX;
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//
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// The IsBpbFat32 macro is defined to work with both packed and unpacked
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// BPB structures. Since we are only checking for zero, the byte order
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// does not matter.
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//
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#define IsBpbFat32(bpb) (*(USHORT *)(&(bpb)->SectorsPerFat) == 0)
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typedef struct BIOS_PARAMETER_BLOCK {
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USHORT BytesPerSector;
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UCHAR SectorsPerCluster;
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USHORT ReservedSectors;
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UCHAR Fats;
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USHORT RootEntries;
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USHORT Sectors;
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UCHAR Media;
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USHORT SectorsPerFat;
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USHORT SectorsPerTrack;
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USHORT Heads;
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ULONG32 HiddenSectors;
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ULONG32 LargeSectors;
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ULONG32 LargeSectorsPerFat;
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union {
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USHORT ExtendedFlags;
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struct {
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ULONG ActiveFat:4;
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ULONG Reserved0:3;
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ULONG MirrorDisabled:1;
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ULONG Reserved1:8;
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};
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};
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USHORT FsVersion;
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ULONG32 RootDirFirstCluster;
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USHORT FsInfoSector;
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USHORT BackupBootSector;
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} BIOS_PARAMETER_BLOCK, *PBIOS_PARAMETER_BLOCK;
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//
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// This macro takes a Packed BIOS and fills in its Unpacked equivalent
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//
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#define FatUnpackBios(Bios,Pbios) { \
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CopyUchar2(&(Bios)->BytesPerSector, &(Pbios)->BytesPerSector[0] ); \
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CopyUchar1(&(Bios)->SectorsPerCluster, &(Pbios)->SectorsPerCluster[0]); \
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CopyUchar2(&(Bios)->ReservedSectors, &(Pbios)->ReservedSectors[0] ); \
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CopyUchar1(&(Bios)->Fats, &(Pbios)->Fats[0] ); \
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CopyUchar2(&(Bios)->RootEntries, &(Pbios)->RootEntries[0] ); \
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CopyUchar2(&(Bios)->Sectors, &(Pbios)->Sectors[0] ); \
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CopyUchar1(&(Bios)->Media, &(Pbios)->Media[0] ); \
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CopyUchar2(&(Bios)->SectorsPerFat, &(Pbios)->SectorsPerFat[0] ); \
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CopyUchar2(&(Bios)->SectorsPerTrack, &(Pbios)->SectorsPerTrack[0] ); \
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CopyUchar2(&(Bios)->Heads, &(Pbios)->Heads[0] ); \
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CopyUchar4(&(Bios)->HiddenSectors, &(Pbios)->HiddenSectors[0] ); \
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CopyUchar4(&(Bios)->LargeSectors, &(Pbios)->LargeSectors[0] ); \
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CopyUchar4(&(Bios)->LargeSectorsPerFat,&((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->LargeSectorsPerFat[0] ); \
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CopyUchar2(&(Bios)->ExtendedFlags, &((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->ExtendedFlags[0] ); \
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CopyUchar2(&(Bios)->FsVersion, &((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->FsVersion[0] ); \
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CopyUchar4(&(Bios)->RootDirFirstCluster, \
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&((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->RootDirFirstCluster[0] ); \
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CopyUchar2(&(Bios)->FsInfoSector, &((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->FsInfoSector[0] ); \
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CopyUchar2(&(Bios)->BackupBootSector, &((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->BackupBootSector[0] ); \
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}
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//
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// Define the boot sector
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//
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typedef struct _PACKED_BOOT_SECTOR {
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UCHAR Jump[3]; // offset = 0x000 0
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UCHAR Oem[8]; // offset = 0x003 3
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PACKED_BIOS_PARAMETER_BLOCK PackedBpb; // offset = 0x00B 11
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UCHAR PhysicalDriveNumber; // offset = 0x024 36
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UCHAR CurrentHead; // offset = 0x025 37
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UCHAR Signature; // offset = 0x026 38
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UCHAR Id[4]; // offset = 0x027 39
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UCHAR VolumeLabel[11]; // offset = 0x02B 43
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UCHAR SystemId[8]; // offset = 0x036 54
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} PACKED_BOOT_SECTOR; // sizeof = 0x03E 62
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typedef PACKED_BOOT_SECTOR *PPACKED_BOOT_SECTOR;
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typedef struct _PACKED_BOOT_SECTOR_EX {
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UCHAR Jump[3]; // offset = 0x000 0
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UCHAR Oem[8]; // offset = 0x003 3
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PACKED_BIOS_PARAMETER_BLOCK_EX PackedBpb; // offset = 0x00B 11
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UCHAR PhysicalDriveNumber; // offset = 0x040 64
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UCHAR CurrentHead; // offset = 0x041 65
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UCHAR Signature; // offset = 0x042 66
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UCHAR Id[4]; // offset = 0x043 67
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UCHAR VolumeLabel[11]; // offset = 0x047 71
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UCHAR SystemId[8]; // offset = 0x058 88
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} PACKED_BOOT_SECTOR_EX; // sizeof = 0x060 96
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typedef PACKED_BOOT_SECTOR_EX *PPACKED_BOOT_SECTOR_EX;
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//
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// Define the FAT32 FsInfo sector.
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//
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typedef struct _FSINFO_SECTOR {
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ULONG SectorBeginSignature; // offset = 0x000 0
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UCHAR ExtraBootCode[480]; // offset = 0x004 4
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ULONG FsInfoSignature; // offset = 0x1e4 484
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ULONG FreeClusterCount; // offset = 0x1e8 488
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ULONG NextFreeCluster; // offset = 0x1ec 492
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UCHAR Reserved[12]; // offset = 0x1f0 496
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ULONG SectorEndSignature; // offset = 0x1fc 508
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} FSINFO_SECTOR, *PFSINFO_SECTOR;
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#define FSINFO_SECTOR_BEGIN_SIGNATURE 0x41615252
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#define FSINFO_SECTOR_END_SIGNATURE 0xAA550000
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#define FSINFO_SIGNATURE 0x61417272
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//
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// We use the CurrentHead field for our dirty partition info.
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//
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#define FAT_BOOT_SECTOR_DIRTY 0x01
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#define FAT_BOOT_SECTOR_TEST_SURFACE 0x02
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//
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// Define a Fat Entry type.
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//
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// This type is used when representing a fat table entry. It also used
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// to be used when dealing with a fat table index and a count of entries,
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// but the ensuing type casting nightmare sealed this fate. These other
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// two types are represented as ULONGs.
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//
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typedef ULONG32 FAT_ENTRY;
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#define FAT32_ENTRY_MASK 0x0FFFFFFFUL
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//
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// We use these special index values to set the dirty info for
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// DOS/Win9x compatibility.
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//
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#define FAT_CLEAN_VOLUME (~FAT32_ENTRY_MASK | 0)
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#define FAT_DIRTY_VOLUME (~FAT32_ENTRY_MASK | 1)
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#define FAT_DIRTY_BIT_INDEX 1
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//
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// Physically, the entry is fully set if clean, and the high
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// bit knocked out if it is dirty (i.e., it is really a clean
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// bit). This means it is different per-FAT size.
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//
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#define FAT_CLEAN_ENTRY (~0)
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#define FAT12_DIRTY_ENTRY 0x7ff
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#define FAT16_DIRTY_ENTRY 0x7fff
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#define FAT32_DIRTY_ENTRY 0x7fffffff
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//
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// The following constants the are the valid Fat index values.
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//
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#define FAT_CLUSTER_AVAILABLE (FAT_ENTRY)0x00000000
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#define FAT_CLUSTER_RESERVED (FAT_ENTRY)0x0ffffff0
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#define FAT_CLUSTER_BAD (FAT_ENTRY)0x0ffffff7
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#define FAT_CLUSTER_LAST (FAT_ENTRY)0x0fffffff
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//
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// Fat files have the following time/date structures. Note that the
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// following structure is a 32 bits long but USHORT aligned.
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//
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typedef struct _FAT_TIME {
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USHORT DoubleSeconds : 5;
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USHORT Minute : 6;
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USHORT Hour : 5;
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} FAT_TIME;
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typedef FAT_TIME *PFAT_TIME;
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typedef struct _FAT_DATE {
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USHORT Day : 5;
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USHORT Month : 4;
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USHORT Year : 7; // Relative to 1980
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} FAT_DATE;
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typedef FAT_DATE *PFAT_DATE;
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typedef struct _FAT_TIME_STAMP {
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FAT_TIME Time;
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FAT_DATE Date;
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} FAT_TIME_STAMP;
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typedef FAT_TIME_STAMP *PFAT_TIME_STAMP;
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//
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// Fat files have 8 character file names and 3 character extensions
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//
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typedef UCHAR FAT8DOT3[11];
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typedef FAT8DOT3 *PFAT8DOT3;
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//
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// The directory entry record exists for every file/directory on the
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// disk except for the root directory.
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//
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typedef struct _PACKED_DIRENT {
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FAT8DOT3 FileName; // offset = 0
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UCHAR Attributes; // offset = 11
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UCHAR NtByte; // offset = 12
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UCHAR CreationMSec; // offset = 13
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FAT_TIME_STAMP CreationTime; // offset = 14
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FAT_DATE LastAccessDate; // offset = 18
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union {
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USHORT ExtendedAttributes; // offset = 20
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USHORT FirstClusterOfFileHi; // offset = 20
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};
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FAT_TIME_STAMP LastWriteTime; // offset = 22
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USHORT FirstClusterOfFile; // offset = 26
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ULONG32 FileSize; // offset = 28
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} PACKED_DIRENT; // sizeof = 32
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typedef PACKED_DIRENT *PPACKED_DIRENT;
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//
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// A packed dirent is already quadword aligned so simply declare a dirent as a
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// packed dirent
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//
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typedef PACKED_DIRENT DIRENT;
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typedef DIRENT *PDIRENT;
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//
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// The first byte of a dirent describes the dirent. There is also a routine
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// to help in deciding how to interpret the dirent.
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//
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#define FAT_DIRENT_NEVER_USED 0x00
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#define FAT_DIRENT_REALLY_0E5 0x05
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#define FAT_DIRENT_DIRECTORY_ALIAS 0x2e
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#define FAT_DIRENT_DELETED 0xe5
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//
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// Define the NtByte bits.
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//
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//
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// These two bits are used for EFS on FAT
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// 0x1 means the file contents are encrypted
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//
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// 0x2 means the EFS metadata header is big.
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// (this optimization means we don't have to read
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// in the first sector of the file stream to get
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// the normal header size)
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//
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#define FAT_DIRENT_NT_BYTE_ENCRYPTED 0x01
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#define FAT_DIRENT_NT_BYTE_BIG_HEADER 0x02
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//
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// These two bits optimize the case in which either the name
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// or extension are all lower case.
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//
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#define FAT_DIRENT_NT_BYTE_8_LOWER_CASE 0x08
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#define FAT_DIRENT_NT_BYTE_3_LOWER_CASE 0x10
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//
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// Define the various dirent attributes
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//
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#define FAT_DIRENT_ATTR_READ_ONLY 0x01
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#define FAT_DIRENT_ATTR_HIDDEN 0x02
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#define FAT_DIRENT_ATTR_SYSTEM 0x04
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#define FAT_DIRENT_ATTR_VOLUME_ID 0x08
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#define FAT_DIRENT_ATTR_DIRECTORY 0x10
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#define FAT_DIRENT_ATTR_ARCHIVE 0x20
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#define FAT_DIRENT_ATTR_DEVICE 0x40
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#define FAT_DIRENT_ATTR_LFN (FAT_DIRENT_ATTR_READ_ONLY | \
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FAT_DIRENT_ATTR_HIDDEN | \
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FAT_DIRENT_ATTR_SYSTEM | \
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FAT_DIRENT_ATTR_VOLUME_ID)
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//
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// On-disk extension for EFS files.
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//
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#define FAT_EFS_EXTENSION L".PFILE"
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#define FAT_EFS_EXTENSION_CHARCOUNT (6)
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#define FAT_EFS_EXTENSION_BYTECOUNT (12)
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//
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// These macros convert a number of fields in the Bpb to bytes from sectors
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//
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// ULONG
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// FatBytesPerCluster (
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// IN PBIOS_PARAMETER_BLOCK Bios
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// );
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//
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// ULONG
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// FatBytesPerFat (
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// IN PBIOS_PARAMETER_BLOCK Bios
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// );
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//
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// ULONG
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// FatReservedBytes (
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// IN PBIOS_PARAMETER_BLOCK Bios
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// );
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//
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#define FatBytesPerCluster(B) ((ULONG)((B)->BytesPerSector * (B)->SectorsPerCluster))
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#define FatBytesPerFat(B) (IsBpbFat32(B)? \
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((ULONG)((B)->BytesPerSector * (B)->LargeSectorsPerFat)) : \
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((ULONG)((B)->BytesPerSector * (B)->SectorsPerFat)))
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#define FatReservedBytes(B) ((ULONG)((B)->BytesPerSector * (B)->ReservedSectors))
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//
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// This macro returns the size of the root directory dirent area in bytes
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// For Fat32, the root directory is variable in length. This macro returns
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// 0 because it is also used to determine the location of cluster 2.
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//
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// ULONG
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// FatRootDirectorySize (
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// IN PBIOS_PARAMETER_BLOCK Bios
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// );
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//
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#define FatRootDirectorySize(B) ((ULONG)((B)->RootEntries * sizeof(DIRENT)))
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//
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// This macro returns the first Lbo (zero based) of the root directory on
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// the device. This area is after the reserved and fats.
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//
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// For Fat32, the root directory is moveable. This macro returns the LBO
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// for cluster 2 because it is used to determine the location of cluster 2.
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// FatRootDirectoryLbo32() returns the actual LBO of the beginning of the
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// actual root directory.
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//
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// LBO
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// FatRootDirectoryLbo (
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// IN PBIOS_PARAMETER_BLOCK Bios
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// );
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//
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#define FatRootDirectoryLbo(B) (FatReservedBytes(B) + ((B)->Fats * FatBytesPerFat(B)))
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#define FatRootDirectoryLbo32(B) (FatFileAreaLbo(B)+((B)->RootDirFirstCluster-2)*FatBytesPerCluster(B))
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//
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// This macro returns the first Lbo (zero based) of the file area on the
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// the device. This area is after the reserved, fats, and root directory.
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//
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// LBO
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// FatFirstFileAreaLbo (
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// IN PBIOS_PARAMTER_BLOCK Bios
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// );
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//
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#define FatFileAreaLbo(B) (FatRootDirectoryLbo(B) + FatRootDirectorySize(B))
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//
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// This macro returns the number of clusters on the disk. This value is
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// computed by taking the total sectors on the disk subtracting up to the
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// first file area sector and then dividing by the sectors per cluster count.
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// Note that I don't use any of the above macros since far too much
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// superfluous sector/byte conversion would take place.
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//
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// ULONG
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// FatNumberOfClusters (
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// IN PBIOS_PARAMETER_BLOCK Bios
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// );
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//
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//
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// for prior to MS-DOS Version 3.2
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//
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// After DOS 4.0, at least one of these, Sectors or LargeSectors, will be zero.
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||
// but DOS version 3.2 case, both of these value might contains some value,
|
||
// because, before 3.2, we don't have Large Sector entry, some disk might have
|
||
// unexpected value in the field, we will use LargeSectors if Sectors eqaul to zero.
|
||
//
|
||
|
||
#define FatNumberOfClusters(B) ( \
|
||
\
|
||
IsBpbFat32(B) ? \
|
||
\
|
||
((((B)->Sectors ? (B)->Sectors : (B)->LargeSectors) \
|
||
\
|
||
- ((B)->ReservedSectors + \
|
||
(B)->Fats * (B)->LargeSectorsPerFat )) \
|
||
\
|
||
/ \
|
||
\
|
||
(B)->SectorsPerCluster) \
|
||
: \
|
||
((((B)->Sectors ? (B)->Sectors : (B)->LargeSectors) \
|
||
\
|
||
- ((B)->ReservedSectors + \
|
||
(B)->Fats * (B)->SectorsPerFat + \
|
||
(B)->RootEntries * sizeof(DIRENT) / (B)->BytesPerSector ) ) \
|
||
\
|
||
/ \
|
||
\
|
||
(B)->SectorsPerCluster) \
|
||
)
|
||
|
||
//
|
||
// This macro returns the fat table bit size (i.e., 12 or 16 bits)
|
||
//
|
||
// ULONG
|
||
// FatIndexBitSize (
|
||
// IN PBIOS_PARAMETER_BLOCK Bios
|
||
// );
|
||
//
|
||
|
||
#define FatIndexBitSize(B) \
|
||
((UCHAR)(IsBpbFat32(B) ? 32 : (FatNumberOfClusters(B) < 4087 ? 12 : 16)))
|
||
|
||
//
|
||
// This macro raises STATUS_FILE_CORRUPT and marks the Fcb bad if an
|
||
// index value is not within the proper range.
|
||
// Note that the first two index values are invalid (0, 1), so we must
|
||
// add two from the top end to make sure the everything is within range
|
||
//
|
||
// VOID
|
||
// FatVerifyIndexIsValid (
|
||
// IN PIRP_CONTEXT IrpContext,
|
||
// IN PVCB Vcb,
|
||
// IN ULONG Index
|
||
// );
|
||
//
|
||
|
||
#define FatVerifyIndexIsValid(IC,V,I) { \
|
||
if (((I) < 2) || ((I) > ((V)->AllocationSupport.NumberOfClusters + 1))) { \
|
||
FatRaiseStatus(IC,STATUS_FILE_CORRUPT_ERROR); \
|
||
} \
|
||
}
|
||
|
||
//
|
||
// These two macros are used to translate between Logical Byte Offsets,
|
||
// and fat entry indexes. Note the use of variables stored in the Vcb.
|
||
// These two macros are used at a higher level than the other macros
|
||
// above.
|
||
//
|
||
// Note, these indexes are true cluster numbers.
|
||
//
|
||
// LBO
|
||
// GetLboFromFatIndex (
|
||
// IN FAT_ENTRY Fat_Index,
|
||
// IN PVCB Vcb
|
||
// );
|
||
//
|
||
// FAT_ENTRY
|
||
// GetFatIndexFromLbo (
|
||
// IN LBO Lbo,
|
||
// IN PVCB Vcb
|
||
// );
|
||
//
|
||
|
||
#define FatGetLboFromIndex(VCB,FAT_INDEX) ( \
|
||
( (LBO) \
|
||
(VCB)->AllocationSupport.FileAreaLbo + \
|
||
(((LBO)((FAT_INDEX) - 2)) << (VCB)->AllocationSupport.LogOfBytesPerCluster) \
|
||
) \
|
||
)
|
||
|
||
#define FatGetIndexFromLbo(VCB,LBO) ( \
|
||
(ULONG) ( \
|
||
(((LBO) - (VCB)->AllocationSupport.FileAreaLbo) >> \
|
||
(VCB)->AllocationSupport.LogOfBytesPerCluster) + 2 \
|
||
) \
|
||
)
|
||
|
||
//
|
||
// The following macro does the shifting and such to lookup an entry
|
||
//
|
||
// VOID
|
||
// FatLookup12BitEntry(
|
||
// IN PVOID Fat,
|
||
// IN FAT_ENTRY Index,
|
||
// OUT PFAT_ENTRY Entry
|
||
// );
|
||
//
|
||
|
||
#define FatLookup12BitEntry(FAT,INDEX,ENTRY) { \
|
||
\
|
||
CopyUchar2((PUCHAR)(ENTRY), (PUCHAR)(FAT) + (INDEX) * 3 / 2); \
|
||
\
|
||
*ENTRY = (FAT_ENTRY)(0xfff & (((INDEX) & 1) ? (*(ENTRY) >> 4) : \
|
||
*(ENTRY))); \
|
||
}
|
||
|
||
//
|
||
// The following macro does the tmp shifting and such to store an entry
|
||
//
|
||
// VOID
|
||
// FatSet12BitEntry(
|
||
// IN PVOID Fat,
|
||
// IN FAT_ENTRY Index,
|
||
// IN FAT_ENTRY Entry
|
||
// );
|
||
//
|
||
|
||
#define FatSet12BitEntry(FAT,INDEX,ENTRY) { \
|
||
\
|
||
FAT_ENTRY TmpFatEntry; \
|
||
\
|
||
CopyUchar2((PUCHAR)&TmpFatEntry, (PUCHAR)(FAT) + (INDEX) * 3 / 2); \
|
||
\
|
||
TmpFatEntry = (FAT_ENTRY) \
|
||
(((INDEX) & 1) ? ((ENTRY) << 4) | (TmpFatEntry & 0xf) \
|
||
: (ENTRY) | (TmpFatEntry & 0xf000)); \
|
||
\
|
||
*((UNALIGNED UCHAR2 *)((PUCHAR)(FAT) + (INDEX) * 3 / 2)) = *((UNALIGNED UCHAR2 *)(&TmpFatEntry)); \
|
||
}
|
||
|
||
//
|
||
// The following macro compares two FAT_TIME_STAMPs
|
||
//
|
||
|
||
#define FatAreTimesEqual(TIME1,TIME2) ( \
|
||
RtlEqualMemory((TIME1),(TIME2), sizeof(FAT_TIME_STAMP)) \
|
||
)
|
||
|
||
|
||
#define EA_FILE_SIGNATURE (0x4445) // "ED"
|
||
#define EA_SET_SIGNATURE (0x4145) // "EA"
|
||
|
||
//
|
||
// If the volume contains any ea data then there is one EA file called
|
||
// "EA DATA. SF" located in the root directory as Hidden, System and
|
||
// ReadOnly.
|
||
//
|
||
|
||
typedef struct _EA_FILE_HEADER {
|
||
USHORT Signature; // offset = 0
|
||
USHORT FormatType; // offset = 2
|
||
USHORT LogType; // offset = 4
|
||
USHORT Cluster1; // offset = 6
|
||
USHORT NewCValue1; // offset = 8
|
||
USHORT Cluster2; // offset = 10
|
||
USHORT NewCValue2; // offset = 12
|
||
USHORT Cluster3; // offset = 14
|
||
USHORT NewCValue3; // offset = 16
|
||
USHORT Handle; // offset = 18
|
||
USHORT NewHOffset; // offset = 20
|
||
UCHAR Reserved[10]; // offset = 22
|
||
USHORT EaBaseTable[240]; // offset = 32
|
||
} EA_FILE_HEADER; // sizeof = 512
|
||
|
||
typedef EA_FILE_HEADER *PEA_FILE_HEADER;
|
||
|
||
typedef USHORT EA_OFF_TABLE[128];
|
||
|
||
typedef EA_OFF_TABLE *PEA_OFF_TABLE;
|
||
|
||
//
|
||
// Every file with an extended attribute contains in its dirent an index
|
||
// into the EaMapTable. The map table contains an offset within the ea
|
||
// file (cluster aligned) of the ea data for the file. The individual
|
||
// ea data for each file is prefaced with an Ea Data Header.
|
||
//
|
||
|
||
typedef struct _EA_SET_HEADER {
|
||
USHORT Signature; // offset = 0
|
||
USHORT OwnEaHandle; // offset = 2
|
||
ULONG32 NeedEaCount; // offset = 4
|
||
UCHAR OwnerFileName[14]; // offset = 8
|
||
UCHAR Reserved[4]; // offset = 22
|
||
UCHAR cbList[4]; // offset = 26
|
||
UCHAR PackedEas[1]; // offset = 30
|
||
} EA_SET_HEADER; // sizeof = 30
|
||
typedef EA_SET_HEADER *PEA_SET_HEADER;
|
||
|
||
#define SIZE_OF_EA_SET_HEADER 30
|
||
|
||
#define MAXIMUM_EA_SIZE 0x0000ffff
|
||
|
||
#define GetcbList(EASET) (((EASET)->cbList[0] << 0) + \
|
||
((EASET)->cbList[1] << 8) + \
|
||
((EASET)->cbList[2] << 16) + \
|
||
((EASET)->cbList[3] << 24))
|
||
|
||
#define SetcbList(EASET,CB) { \
|
||
(EASET)->cbList[0] = (CB >> 0) & 0x0ff; \
|
||
(EASET)->cbList[1] = (CB >> 8) & 0x0ff; \
|
||
(EASET)->cbList[2] = (CB >> 16) & 0x0ff; \
|
||
(EASET)->cbList[3] = (CB >> 24) & 0x0ff; \
|
||
}
|
||
|
||
//
|
||
// Every individual ea in an ea set is declared the following packed ea
|
||
//
|
||
|
||
typedef struct _PACKED_EA {
|
||
UCHAR Flags;
|
||
UCHAR EaNameLength;
|
||
UCHAR EaValueLength[2];
|
||
CHAR EaName[1];
|
||
} PACKED_EA;
|
||
typedef PACKED_EA *PPACKED_EA;
|
||
|
||
//
|
||
// The following two macros are used to get and set the ea value length
|
||
// field of a packed ea
|
||
//
|
||
// VOID
|
||
// GetEaValueLength (
|
||
// IN PPACKED_EA Ea,
|
||
// OUT PUSHORT ValueLength
|
||
// );
|
||
//
|
||
// VOID
|
||
// SetEaValueLength (
|
||
// IN PPACKED_EA Ea,
|
||
// IN USHORT ValueLength
|
||
// );
|
||
//
|
||
|
||
#define GetEaValueLength(EA,LEN) { \
|
||
*(LEN) = 0; \
|
||
CopyUchar2( (LEN), (EA)->EaValueLength ); \
|
||
}
|
||
|
||
#define SetEaValueLength(EA,LEN) { \
|
||
CopyUchar2( &((EA)->EaValueLength), (LEN) ); \
|
||
}
|
||
|
||
//
|
||
// The following macro is used to get the size of a packed ea
|
||
//
|
||
// VOID
|
||
// SizeOfPackedEa (
|
||
// IN PPACKED_EA Ea,
|
||
// OUT PUSHORT EaSize
|
||
// );
|
||
//
|
||
|
||
#define SizeOfPackedEa(EA,SIZE) { \
|
||
ULONG _NL,_DL; _NL = 0; _DL = 0; \
|
||
CopyUchar1(&_NL, &(EA)->EaNameLength); \
|
||
GetEaValueLength(EA, &_DL); \
|
||
*(SIZE) = 1 + 1 + 2 + _NL + 1 + _DL; \
|
||
}
|
||
|
||
#define EA_NEED_EA_FLAG 0x80
|
||
#define MIN_EA_HANDLE 1
|
||
#define MAX_EA_HANDLE 30719
|
||
#define UNUSED_EA_HANDLE 0xffff
|
||
#define EA_CBLIST_OFFSET 0x1a
|
||
#define MAX_EA_BASE_INDEX 240
|
||
#define MAX_EA_OFFSET_INDEX 128
|
||
|
||
|
||
#endif // _FAT_
|
||
|