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reactos/drivers/filesystems/fastfat_new/fat.h
Amine Khaldi 527f2f9057 [SHELL/EXPERIMENTS] 
* Create a branch for some evul shell experiments.

svn path=/branches/shell-experiments/; revision=61927
2014-02-02 19:37:27 +00:00

289 lines
8.3 KiB
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#pragma once
//
// Might be a good idea to have this as a shared
// header with FS Recognizer.
//
//
// Conversion types and macros taken from internal ntifs headers
//
typedef union _UCHAR1
{
UCHAR Uchar[1];
UCHAR ForceAlignment;
} UCHAR1, *PUCHAR1;
typedef union _UCHAR2
{
UCHAR Uchar[2];
USHORT ForceAlignment;
} UCHAR2, *PUCHAR2;
typedef union _UCHAR4
{
UCHAR Uchar[4];
ULONG ForceAlignment;
} UCHAR4, *PUCHAR4;
#define CopyUchar1(Dst,Src) { \
*((UCHAR1 *)(Dst)) = *((UNALIGNED UCHAR1 *)(Src)); \
}
#define CopyUchar2(Dst,Src) { \
*((UCHAR2 *)(Dst)) = *((UNALIGNED UCHAR2 *)(Src)); \
}
#define CopyUchar4(Dst,Src) { \
*((UCHAR4 *)(Dst)) = *((UNALIGNED UCHAR4 *)(Src)); \
}
#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)->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] ); \
}
//
// Packed versions of the BPB and Boot Sector
//
typedef struct _PACKED_BIOS_PARAMETER_BLOCK
{
UCHAR BytesPerSector[2];
UCHAR SectorsPerCluster[1];
UCHAR ReservedSectors[2];
UCHAR Fats[1];
UCHAR RootEntries[2];
UCHAR Sectors[2];
UCHAR Media[1];
UCHAR SectorsPerFat[2];
UCHAR SectorsPerTrack[2];
UCHAR Heads[2];
UCHAR HiddenSectors[4];
UCHAR LargeSectors[4];
} PACKED_BIOS_PARAMETER_BLOCK, *PPACKED_BIOS_PARAMETER_BLOCK;
// sizeof = 0x019
typedef struct _PACKED_BIOS_PARAMETER_BLOCK_EX
{
PACKED_BIOS_PARAMETER_BLOCK Block;
UCHAR LargeSectorsPerFat[4];
UCHAR ExtendedFlags[2];
UCHAR FsVersion[2];
UCHAR RootDirFirstCluster[4];
UCHAR FsInfoSector[2];
UCHAR BackupBootSector[2];
UCHAR Reserved[12];
} PACKED_BIOS_PARAMETER_BLOCK_EX, *PPACKED_BIOS_PARAMETER_BLOCK_EX;
// sizeof = 0x035 53
//
// Unpacked version of the BPB
//
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;
ULONG HiddenSectors;
ULONG LargeSectors;
ULONG LargeSectorsPerFat;
union
{
USHORT ExtendedFlags;
struct
{
ULONG ActiveFat:4;
ULONG Reserved0:3;
ULONG MirrorDisabled:1;
ULONG Reserved1:8;
};
};
USHORT FsVersion;
ULONG RootDirFirstCluster;
USHORT FsInfoSector;
USHORT BackupBootSector;
} BIOS_PARAMETER_BLOCK, *PBIOS_PARAMETER_BLOCK;
#define FatValidBytesPerSector(xBytes) \
(!((xBytes) & ((xBytes)-1)) && (xBytes)>=0x80 && (xBytes)<=0x1000)
#define FatValidSectorsPerCluster(xSectors) \
(!((xSectors) & ((xSectors)-1)) && (xSectors)>0 && (xSectors)<=0x80)
typedef struct _PACKED_BOOT_SECTOR
{
UCHAR Jump[3];
UCHAR Oem[8];
PACKED_BIOS_PARAMETER_BLOCK PackedBpb;
UCHAR PhysicalDriveNumber;
UCHAR CurrentHead;
UCHAR Signature;
UCHAR Id[4];
UCHAR VolumeLabel[11];
UCHAR SystemId[8];
} PACKED_BOOT_SECTOR, *PPACKED_BOOT_SECTOR;
// sizeof = 0x03E
typedef struct _PACKED_BOOT_SECTOR_EX
{
UCHAR Jump[3];
UCHAR Oem[8];
PACKED_BIOS_PARAMETER_BLOCK_EX PackedBpb;
UCHAR PhysicalDriveNumber;
UCHAR CurrentHead;
UCHAR Signature;
UCHAR Id[4];
UCHAR VolumeLabel[11];
UCHAR SystemId[8];
} PACKED_BOOT_SECTOR_EX, *PPACKED_BOOT_SECTOR_EX;
// sizeof = 0x060
#define FatBootSectorJumpValid(xMagic) \
((xMagic)[0] == 0xe9 || (xMagic)[0] == 0xeb || (xMagic)[0] == 0x49)
typedef struct _FSINFO_SECTOR
{
ULONG SectorBeginSignature;
UCHAR Reserved[480];
ULONG FsInfoSignature;
ULONG FreeClusterCount;
ULONG NextFreeCluster;
UCHAR Reserved0[12];
ULONG SectorEndSignature;
} FSINFO_SECTOR, *PFSINFO_SECTOR;
// sizeof = 0x200
#define FSINFO_SECTOR_BEGIN_SIGNATURE 0x41615252
#define FSINFO_SECTOR_END_SIGNATURE 0xaa550000
#define FSINFO_SIGNATURE 0x61417272
//
// Cluster Markers:
//
#define FAT_CLUSTER_AVAILABLE 0x00000000
#define FAT_CLUSTER_RESERVED 0x0ffffff0
#define FAT_CLUSTER_BAD 0x0ffffff7
#define FAT_CLUSTER_LAST 0x0fffffff
//
// Directory Structure:
//
typedef struct _FAT_TIME
{
union {
struct {
USHORT DoubleSeconds : 5;
USHORT Minute : 6;
USHORT Hour : 5;
};
USHORT Value;
};
} FAT_TIME, *PFAT_TIME;
//
//
//
typedef struct _FAT_DATE {
union {
struct {
USHORT Day : 5;
USHORT Month : 4;
/* Relative to 1980 */
USHORT Year : 7;
};
USHORT Value;
};
} FAT_DATE, *PFAT_DATE;
//
//
//
typedef struct _FAT_DATETIME {
union {
struct {
FAT_TIME Time;
FAT_DATE Date;
};
ULONG Value;
};
} FAT_DATETIME, *PFAT_DATETIME;
//
//
//
typedef struct _DIR_ENTRY
{
UCHAR FileName[11];
UCHAR Attributes;
UCHAR Case;
UCHAR CreationTimeTenMs;
FAT_DATETIME CreationDateTime;
FAT_DATE LastAccessDate;
union {
USHORT ExtendedAttributes;
USHORT FirstClusterOfFileHi;
};
FAT_DATETIME LastWriteDateTime;
USHORT FirstCluster;
ULONG FileSize;
} DIR_ENTRY, *PDIR_ENTRY;
// sizeof = 0x020
typedef struct _LONG_FILE_NAME_ENTRY {
UCHAR SeqNum;
UCHAR NameA[10];
UCHAR Attributes;
UCHAR Type;
UCHAR Checksum;
USHORT NameB[6];
USHORT Reserved;
USHORT NameC[2];
} LONG_FILE_NAME_ENTRY, *PLONG_FILE_NAME_ENTRY;
// sizeof = 0x020
#define FAT_LFN_NAME_LENGTH \
(RTL_FIELD_SIZE(LONG_FILE_NAME_ENTRY, NameA) \
+ RTL_FIELD_SIZE(LONG_FILE_NAME_ENTRY, NameB) \
+ RTL_FIELD_SIZE(LONG_FILE_NAME_ENTRY, NameC))
#define FAT_FN_DIR_ENTRY_LAST 0x40
#define FAT_FN_MAX_DIR_ENTIES 0x14
#define FAT_BYTES_PER_DIRENT 0x20
#define FAT_BYTES_PER_DIRENT_LOG 0x05
#define FAT_DIRENT_NEVER_USED 0x00
#define FAT_DIRENT_REALLY_0E5 0x05
#define FAT_DIRENT_DIRECTORY_ALIAS 0x2e
#define FAT_DIRENT_DELETED 0xe5
#define FAT_CASE_LOWER_BASE 0x08
#define FAT_CASE_LOWER_EXT 0x10
#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)
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