You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
737 lines
27 KiB
737 lines
27 KiB
/*++
|
|
|
|
Copyright (c) 1989-2000 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
Fat.h
|
|
|
|
Abstract:
|
|
|
|
This module defines the on-disk structure of the Fat file system.
|
|
|
|
// @@BEGIN_DDKSPLIT
|
|
|
|
Author:
|
|
|
|
Gary Kimura [GaryKi] 28-Dec-1989
|
|
|
|
Revision History:
|
|
|
|
// @@END_DDKSPLIT
|
|
|
|
--*/
|
|
|
|
#ifndef _FAT_
|
|
#define _FAT_
|
|
|
|
//
|
|
// The following nomenclature is used to describe the Fat on-disk
|
|
// structure:
|
|
//
|
|
// LBN - is the number of a sector relative to the start of the disk.
|
|
//
|
|
// VBN - is the number of a sector relative to the start of a file,
|
|
// directory, or allocation.
|
|
//
|
|
// LBO - is a byte offset relative to the start of the disk.
|
|
//
|
|
// VBO - is a byte offset relative to the start of a file, directory
|
|
// or allocation.
|
|
//
|
|
|
|
typedef LONGLONG LBO; /* for Fat32, LBO is >32 bits */
|
|
|
|
typedef LBO *PLBO;
|
|
|
|
typedef ULONG32 VBO;
|
|
typedef VBO *PVBO;
|
|
|
|
|
|
//
|
|
// The boot sector is the first physical sector (LBN == 0) on the volume.
|
|
// Part of the sector contains a BIOS Parameter Block. The BIOS in the
|
|
// sector is packed (i.e., unaligned) so we'll supply a unpacking macro
|
|
// to translate a packed BIOS into its unpacked equivalent. The unpacked
|
|
// BIOS structure is already defined in ntioapi.h so we only need to define
|
|
// the packed BIOS.
|
|
//
|
|
|
|
//
|
|
// Define the Packed and Unpacked BIOS Parameter Block
|
|
//
|
|
|
|
typedef struct _PACKED_BIOS_PARAMETER_BLOCK {
|
|
UCHAR BytesPerSector[2]; // offset = 0x000 0
|
|
UCHAR SectorsPerCluster[1]; // offset = 0x002 2
|
|
UCHAR ReservedSectors[2]; // offset = 0x003 3
|
|
UCHAR Fats[1]; // offset = 0x005 5
|
|
UCHAR RootEntries[2]; // offset = 0x006 6
|
|
UCHAR Sectors[2]; // offset = 0x008 8
|
|
UCHAR Media[1]; // offset = 0x00A 10
|
|
UCHAR SectorsPerFat[2]; // offset = 0x00B 11
|
|
UCHAR SectorsPerTrack[2]; // offset = 0x00D 13
|
|
UCHAR Heads[2]; // offset = 0x00F 15
|
|
UCHAR HiddenSectors[4]; // offset = 0x011 17
|
|
UCHAR LargeSectors[4]; // offset = 0x015 21
|
|
} PACKED_BIOS_PARAMETER_BLOCK; // sizeof = 0x019 25
|
|
typedef PACKED_BIOS_PARAMETER_BLOCK *PPACKED_BIOS_PARAMETER_BLOCK;
|
|
|
|
typedef struct _PACKED_BIOS_PARAMETER_BLOCK_EX {
|
|
UCHAR BytesPerSector[2]; // offset = 0x000 0
|
|
UCHAR SectorsPerCluster[1]; // offset = 0x002 2
|
|
UCHAR ReservedSectors[2]; // offset = 0x003 3
|
|
UCHAR Fats[1]; // offset = 0x005 5
|
|
UCHAR RootEntries[2]; // offset = 0x006 6
|
|
UCHAR Sectors[2]; // offset = 0x008 8
|
|
UCHAR Media[1]; // offset = 0x00A 10
|
|
UCHAR SectorsPerFat[2]; // offset = 0x00B 11
|
|
UCHAR SectorsPerTrack[2]; // offset = 0x00D 13
|
|
UCHAR Heads[2]; // offset = 0x00F 15
|
|
UCHAR HiddenSectors[4]; // offset = 0x011 17
|
|
UCHAR LargeSectors[4]; // offset = 0x015 21
|
|
UCHAR LargeSectorsPerFat[4]; // offset = 0x019 25
|
|
UCHAR ExtendedFlags[2]; // offset = 0x01D 29
|
|
UCHAR FsVersion[2]; // offset = 0x01F 31
|
|
UCHAR RootDirFirstCluster[4]; // offset = 0x021 33
|
|
UCHAR FsInfoSector[2]; // offset = 0x025 37
|
|
UCHAR BackupBootSector[2]; // offset = 0x027 39
|
|
UCHAR Reserved[12]; // offset = 0x029 41
|
|
} PACKED_BIOS_PARAMETER_BLOCK_EX; // sizeof = 0x035 53
|
|
|
|
typedef PACKED_BIOS_PARAMETER_BLOCK_EX *PPACKED_BIOS_PARAMETER_BLOCK_EX;
|
|
|
|
//
|
|
// The IsBpbFat32 macro is defined to work with both packed and unpacked
|
|
// BPB structures. Since we are only checking for zero, the byte order
|
|
// does not matter.
|
|
//
|
|
|
|
#define IsBpbFat32(bpb) (*(USHORT *)(&(bpb)->SectorsPerFat) == 0)
|
|
|
|
typedef struct BIOS_PARAMETER_BLOCK {
|
|
USHORT BytesPerSector;
|
|
UCHAR SectorsPerCluster;
|
|
USHORT ReservedSectors;
|
|
UCHAR Fats;
|
|
USHORT RootEntries;
|
|
USHORT Sectors;
|
|
UCHAR Media;
|
|
USHORT SectorsPerFat;
|
|
USHORT SectorsPerTrack;
|
|
USHORT Heads;
|
|
ULONG32 HiddenSectors;
|
|
ULONG32 LargeSectors;
|
|
ULONG32 LargeSectorsPerFat;
|
|
union {
|
|
USHORT ExtendedFlags;
|
|
struct {
|
|
ULONG ActiveFat:4;
|
|
ULONG Reserved0:3;
|
|
ULONG MirrorDisabled:1;
|
|
ULONG Reserved1:8;
|
|
};
|
|
};
|
|
USHORT FsVersion;
|
|
ULONG32 RootDirFirstCluster;
|
|
USHORT FsInfoSector;
|
|
USHORT BackupBootSector;
|
|
} BIOS_PARAMETER_BLOCK, *PBIOS_PARAMETER_BLOCK;
|
|
|
|
//
|
|
// This macro takes a Packed BIOS and fills in its Unpacked equivalent
|
|
//
|
|
|
|
#define FatUnpackBios(Bios,Pbios) { \
|
|
CopyUchar2(&(Bios)->BytesPerSector, &(Pbios)->BytesPerSector[0] ); \
|
|
CopyUchar1(&(Bios)->SectorsPerCluster, &(Pbios)->SectorsPerCluster[0]); \
|
|
CopyUchar2(&(Bios)->ReservedSectors, &(Pbios)->ReservedSectors[0] ); \
|
|
CopyUchar1(&(Bios)->Fats, &(Pbios)->Fats[0] ); \
|
|
CopyUchar2(&(Bios)->RootEntries, &(Pbios)->RootEntries[0] ); \
|
|
CopyUchar2(&(Bios)->Sectors, &(Pbios)->Sectors[0] ); \
|
|
CopyUchar1(&(Bios)->Media, &(Pbios)->Media[0] ); \
|
|
CopyUchar2(&(Bios)->SectorsPerFat, &(Pbios)->SectorsPerFat[0] ); \
|
|
CopyUchar2(&(Bios)->SectorsPerTrack, &(Pbios)->SectorsPerTrack[0] ); \
|
|
CopyUchar2(&(Bios)->Heads, &(Pbios)->Heads[0] ); \
|
|
CopyUchar4(&(Bios)->HiddenSectors, &(Pbios)->HiddenSectors[0] ); \
|
|
CopyUchar4(&(Bios)->LargeSectors, &(Pbios)->LargeSectors[0] ); \
|
|
CopyUchar4(&(Bios)->LargeSectorsPerFat,&((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->LargeSectorsPerFat[0] ); \
|
|
CopyUchar2(&(Bios)->ExtendedFlags, &((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->ExtendedFlags[0] ); \
|
|
CopyUchar2(&(Bios)->FsVersion, &((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->FsVersion[0] ); \
|
|
CopyUchar4(&(Bios)->RootDirFirstCluster, \
|
|
&((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->RootDirFirstCluster[0] ); \
|
|
CopyUchar2(&(Bios)->FsInfoSector, &((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->FsInfoSector[0] ); \
|
|
CopyUchar2(&(Bios)->BackupBootSector, &((PPACKED_BIOS_PARAMETER_BLOCK_EX)Pbios)->BackupBootSector[0] ); \
|
|
}
|
|
|
|
//
|
|
// Define the boot sector
|
|
//
|
|
|
|
typedef struct _PACKED_BOOT_SECTOR {
|
|
UCHAR Jump[3]; // offset = 0x000 0
|
|
UCHAR Oem[8]; // offset = 0x003 3
|
|
PACKED_BIOS_PARAMETER_BLOCK PackedBpb; // offset = 0x00B 11
|
|
UCHAR PhysicalDriveNumber; // offset = 0x024 36
|
|
UCHAR CurrentHead; // offset = 0x025 37
|
|
UCHAR Signature; // offset = 0x026 38
|
|
UCHAR Id[4]; // offset = 0x027 39
|
|
UCHAR VolumeLabel[11]; // offset = 0x02B 43
|
|
UCHAR SystemId[8]; // offset = 0x036 54
|
|
} PACKED_BOOT_SECTOR; // sizeof = 0x03E 62
|
|
|
|
typedef PACKED_BOOT_SECTOR *PPACKED_BOOT_SECTOR;
|
|
|
|
typedef struct _PACKED_BOOT_SECTOR_EX {
|
|
UCHAR Jump[3]; // offset = 0x000 0
|
|
UCHAR Oem[8]; // offset = 0x003 3
|
|
PACKED_BIOS_PARAMETER_BLOCK_EX PackedBpb; // offset = 0x00B 11
|
|
UCHAR PhysicalDriveNumber; // offset = 0x040 64
|
|
UCHAR CurrentHead; // offset = 0x041 65
|
|
UCHAR Signature; // offset = 0x042 66
|
|
UCHAR Id[4]; // offset = 0x043 67
|
|
UCHAR VolumeLabel[11]; // offset = 0x047 71
|
|
UCHAR SystemId[8]; // offset = 0x058 88
|
|
} PACKED_BOOT_SECTOR_EX; // sizeof = 0x060 96
|
|
|
|
typedef PACKED_BOOT_SECTOR_EX *PPACKED_BOOT_SECTOR_EX;
|
|
|
|
//
|
|
// Define the FAT32 FsInfo sector.
|
|
//
|
|
|
|
typedef struct _FSINFO_SECTOR {
|
|
ULONG SectorBeginSignature; // offset = 0x000 0
|
|
UCHAR ExtraBootCode[480]; // offset = 0x004 4
|
|
ULONG FsInfoSignature; // offset = 0x1e4 484
|
|
ULONG FreeClusterCount; // offset = 0x1e8 488
|
|
ULONG NextFreeCluster; // offset = 0x1ec 492
|
|
UCHAR Reserved[12]; // offset = 0x1f0 496
|
|
ULONG SectorEndSignature; // offset = 0x1fc 508
|
|
} FSINFO_SECTOR, *PFSINFO_SECTOR;
|
|
|
|
#define FSINFO_SECTOR_BEGIN_SIGNATURE 0x41615252
|
|
#define FSINFO_SECTOR_END_SIGNATURE 0xAA550000
|
|
|
|
#define FSINFO_SIGNATURE 0x61417272
|
|
|
|
//
|
|
// We use the CurrentHead field for our dirty partition info.
|
|
//
|
|
|
|
#define FAT_BOOT_SECTOR_DIRTY 0x01
|
|
#define FAT_BOOT_SECTOR_TEST_SURFACE 0x02
|
|
|
|
//
|
|
// Define a Fat Entry type.
|
|
//
|
|
// This type is used when representing a fat table entry. It also used
|
|
// to be used when dealing with a fat table index and a count of entries,
|
|
// but the ensuing type casting nightmare sealed this fate. These other
|
|
// two types are represented as ULONGs.
|
|
//
|
|
|
|
typedef ULONG32 FAT_ENTRY;
|
|
|
|
#define FAT32_ENTRY_MASK 0x0FFFFFFFUL
|
|
|
|
//
|
|
// We use these special index values to set the dirty info for
|
|
// DOS/Win9x compatibility.
|
|
//
|
|
|
|
#define FAT_CLEAN_VOLUME (~FAT32_ENTRY_MASK | 0)
|
|
#define FAT_DIRTY_VOLUME (~FAT32_ENTRY_MASK | 1)
|
|
|
|
#define FAT_DIRTY_BIT_INDEX 1
|
|
|
|
//
|
|
// Physically, the entry is fully set if clean, and the high
|
|
// bit knocked out if it is dirty (i.e., it is really a clean
|
|
// bit). This means it is different per-FAT size.
|
|
//
|
|
|
|
#define FAT_CLEAN_ENTRY (~0)
|
|
|
|
#define FAT12_DIRTY_ENTRY 0x7ff
|
|
#define FAT16_DIRTY_ENTRY 0x7fff
|
|
#define FAT32_DIRTY_ENTRY 0x7fffffff
|
|
|
|
//
|
|
// The following constants the are the valid Fat index values.
|
|
//
|
|
|
|
#define FAT_CLUSTER_AVAILABLE (FAT_ENTRY)0x00000000
|
|
#define FAT_CLUSTER_RESERVED (FAT_ENTRY)0x0ffffff0
|
|
#define FAT_CLUSTER_BAD (FAT_ENTRY)0x0ffffff7
|
|
#define FAT_CLUSTER_LAST (FAT_ENTRY)0x0fffffff
|
|
|
|
//
|
|
// Fat files have the following time/date structures. Note that the
|
|
// following structure is a 32 bits long but USHORT aligned.
|
|
//
|
|
|
|
typedef struct _FAT_TIME {
|
|
|
|
USHORT DoubleSeconds : 5;
|
|
USHORT Minute : 6;
|
|
USHORT Hour : 5;
|
|
|
|
} FAT_TIME;
|
|
typedef FAT_TIME *PFAT_TIME;
|
|
|
|
typedef struct _FAT_DATE {
|
|
|
|
USHORT Day : 5;
|
|
USHORT Month : 4;
|
|
USHORT Year : 7; // Relative to 1980
|
|
|
|
} FAT_DATE;
|
|
typedef FAT_DATE *PFAT_DATE;
|
|
|
|
typedef struct _FAT_TIME_STAMP {
|
|
|
|
FAT_TIME Time;
|
|
FAT_DATE Date;
|
|
|
|
} FAT_TIME_STAMP;
|
|
typedef FAT_TIME_STAMP *PFAT_TIME_STAMP;
|
|
|
|
//
|
|
// Fat files have 8 character file names and 3 character extensions
|
|
//
|
|
|
|
typedef UCHAR FAT8DOT3[11];
|
|
typedef FAT8DOT3 *PFAT8DOT3;
|
|
|
|
|
|
//
|
|
// The directory entry record exists for every file/directory on the
|
|
// disk except for the root directory.
|
|
//
|
|
|
|
typedef struct _PACKED_DIRENT {
|
|
FAT8DOT3 FileName; // offset = 0
|
|
UCHAR Attributes; // offset = 11
|
|
UCHAR NtByte; // offset = 12
|
|
UCHAR CreationMSec; // offset = 13
|
|
FAT_TIME_STAMP CreationTime; // offset = 14
|
|
FAT_DATE LastAccessDate; // offset = 18
|
|
union {
|
|
USHORT ExtendedAttributes; // offset = 20
|
|
USHORT FirstClusterOfFileHi; // offset = 20
|
|
};
|
|
FAT_TIME_STAMP LastWriteTime; // offset = 22
|
|
USHORT FirstClusterOfFile; // offset = 26
|
|
ULONG32 FileSize; // offset = 28
|
|
} PACKED_DIRENT; // sizeof = 32
|
|
typedef PACKED_DIRENT *PPACKED_DIRENT;
|
|
|
|
//
|
|
// A packed dirent is already quadword aligned so simply declare a dirent as a
|
|
// packed dirent
|
|
//
|
|
|
|
typedef PACKED_DIRENT DIRENT;
|
|
typedef DIRENT *PDIRENT;
|
|
|
|
//
|
|
// The first byte of a dirent describes the dirent. There is also a routine
|
|
// to help in deciding how to interpret the dirent.
|
|
//
|
|
|
|
#define FAT_DIRENT_NEVER_USED 0x00
|
|
#define FAT_DIRENT_REALLY_0E5 0x05
|
|
#define FAT_DIRENT_DIRECTORY_ALIAS 0x2e
|
|
#define FAT_DIRENT_DELETED 0xe5
|
|
|
|
//
|
|
// Define the NtByte bits.
|
|
//
|
|
|
|
#define FAT_DIRENT_NT_BYTE_8_LOWER_CASE 0x08
|
|
#define FAT_DIRENT_NT_BYTE_3_LOWER_CASE 0x10
|
|
|
|
//
|
|
// Define the various dirent attributes
|
|
//
|
|
|
|
#define FAT_DIRENT_ATTR_READ_ONLY 0x01
|
|
#define FAT_DIRENT_ATTR_HIDDEN 0x02
|
|
#define FAT_DIRENT_ATTR_SYSTEM 0x04
|
|
#define FAT_DIRENT_ATTR_VOLUME_ID 0x08
|
|
#define FAT_DIRENT_ATTR_DIRECTORY 0x10
|
|
#define FAT_DIRENT_ATTR_ARCHIVE 0x20
|
|
#define FAT_DIRENT_ATTR_DEVICE 0x40
|
|
#define FAT_DIRENT_ATTR_LFN (FAT_DIRENT_ATTR_READ_ONLY | \
|
|
FAT_DIRENT_ATTR_HIDDEN | \
|
|
FAT_DIRENT_ATTR_SYSTEM | \
|
|
FAT_DIRENT_ATTR_VOLUME_ID)
|
|
|
|
|
|
//
|
|
// These macros convert a number of fields in the Bpb to bytes from sectors
|
|
//
|
|
// ULONG
|
|
// FatBytesPerCluster (
|
|
// IN PBIOS_PARAMETER_BLOCK Bios
|
|
// );
|
|
//
|
|
// ULONG
|
|
// FatBytesPerFat (
|
|
// IN PBIOS_PARAMETER_BLOCK Bios
|
|
// );
|
|
//
|
|
// ULONG
|
|
// FatReservedBytes (
|
|
// IN PBIOS_PARAMETER_BLOCK Bios
|
|
// );
|
|
//
|
|
|
|
#define FatBytesPerCluster(B) ((ULONG)((B)->BytesPerSector * (B)->SectorsPerCluster))
|
|
|
|
#define FatBytesPerFat(B) (IsBpbFat32(B)? \
|
|
((ULONG)((B)->BytesPerSector * (B)->LargeSectorsPerFat)) : \
|
|
((ULONG)((B)->BytesPerSector * (B)->SectorsPerFat)))
|
|
|
|
#define FatReservedBytes(B) ((ULONG)((B)->BytesPerSector * (B)->ReservedSectors))
|
|
|
|
//
|
|
// This macro returns the size of the root directory dirent area in bytes
|
|
// For Fat32, the root directory is variable in length. This macro returns
|
|
// 0 because it is also used to determine the location of cluster 2.
|
|
//
|
|
// ULONG
|
|
// FatRootDirectorySize (
|
|
// IN PBIOS_PARAMETER_BLOCK Bios
|
|
// );
|
|
//
|
|
|
|
#define FatRootDirectorySize(B) ((ULONG)((B)->RootEntries * sizeof(DIRENT)))
|
|
|
|
|
|
//
|
|
// This macro returns the first Lbo (zero based) of the root directory on
|
|
// the device. This area is after the reserved and fats.
|
|
//
|
|
// For Fat32, the root directory is moveable. This macro returns the LBO
|
|
// for cluster 2 because it is used to determine the location of cluster 2.
|
|
// FatRootDirectoryLbo32() returns the actual LBO of the beginning of the
|
|
// actual root directory.
|
|
//
|
|
// LBO
|
|
// FatRootDirectoryLbo (
|
|
// IN PBIOS_PARAMETER_BLOCK Bios
|
|
// );
|
|
//
|
|
|
|
#define FatRootDirectoryLbo(B) (FatReservedBytes(B) + ((B)->Fats * FatBytesPerFat(B)))
|
|
#define FatRootDirectoryLbo32(B) (FatFileAreaLbo(B)+((B)->RootDirFirstCluster-2)*FatBytesPerCluster(B))
|
|
|
|
//
|
|
// This macro returns the first Lbo (zero based) of the file area on the
|
|
// the device. This area is after the reserved, fats, and root directory.
|
|
//
|
|
// LBO
|
|
// FatFirstFileAreaLbo (
|
|
// IN PBIOS_PARAMTER_BLOCK Bios
|
|
// );
|
|
//
|
|
|
|
#define FatFileAreaLbo(B) (FatRootDirectoryLbo(B) + FatRootDirectorySize(B))
|
|
|
|
//
|
|
// This macro returns the number of clusters on the disk. This value is
|
|
// computed by taking the total sectors on the disk subtracting up to the
|
|
// first file area sector and then dividing by the sectors per cluster count.
|
|
// Note that I don't use any of the above macros since far too much
|
|
// superfluous sector/byte conversion would take place.
|
|
//
|
|
// ULONG
|
|
// FatNumberOfClusters (
|
|
// IN PBIOS_PARAMETER_BLOCK Bios
|
|
// );
|
|
//
|
|
|
|
//
|
|
// for prior to MS-DOS Version 3.2
|
|
//
|
|
// After DOS 4.0, at least one of these, Sectors or LargeSectors, will be zero.
|
|
// 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_
|