fat.h File Reference

#include <pshpack1.h>
#include <poppack.h>

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Go to the source code of this file.

Classes
struct	_FAT_BOOTSECTOR
struct	_FAT32_BOOTSECTOR
struct	_FATX_BOOTSECTOR
struct	DIRENTRY
struct	LFN_DIRENTRY
struct	FATX_DIRENTRY
struct	FAT_FILE_INFO

Macros
#define	ATTR_NORMAL   0x00
#define	ATTR_READONLY   0x01
#define	ATTR_HIDDEN   0x02
#define	ATTR_SYSTEM   0x04
#define	ATTR_VOLUMENAME   0x08
#define	ATTR_DIRECTORY   0x10
#define	ATTR_ARCHIVE   0x20
#define	ATTR_LONG_NAME   (ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUMENAME)
#define	FAT12   1
#define	FAT16   2
#define	FAT32   3
#define	FATX16   4
#define	FATX32   5
#define	ISFATX(FT)   ((FT) == FATX16 || (FT) == FATX32)

Typedefs
typedef struct _FAT_BOOTSECTOR	FAT_BOOTSECTOR
typedef struct _FAT_BOOTSECTOR *	PFAT_BOOTSECTOR
typedef struct _FAT32_BOOTSECTOR	FAT32_BOOTSECTOR
typedef struct _FAT32_BOOTSECTOR *	PFAT32_BOOTSECTOR
typedef struct _FATX_BOOTSECTOR	FATX_BOOTSECTOR
typedef struct _FATX_BOOTSECTOR *	PFATX_BOOTSECTOR
typedef struct DIRENTRY *	PDIRENTRY
typedef struct LFN_DIRENTRY *	PLFN_DIRENTRY
typedef struct FATX_DIRENTRY *	PFATX_DIRENTRY
typedef struct _FAT_VOLUME_INFO *	PFAT_VOLUME_INFO
typedef struct FAT_FILE_INFO *	PFAT_FILE_INFO

Functions
const DEVVTBL *	FatMount (ULONG DeviceId)

Macro Definition Documentation

ATTR_ARCHIVE

#define ATTR_ARCHIVE   0x20

Definition at line 164 of file fat.h.

ATTR_DIRECTORY

#define ATTR_DIRECTORY   0x10

Definition at line 163 of file fat.h.

ATTR_HIDDEN

#define ATTR_HIDDEN   0x02

Definition at line 160 of file fat.h.

ATTR_LONG_NAME

#define ATTR_LONG_NAME   (ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUMENAME)

Definition at line 165 of file fat.h.

ATTR_NORMAL

#define ATTR_NORMAL   0x00

Definition at line 158 of file fat.h.

ATTR_READONLY

#define ATTR_READONLY   0x01

Definition at line 159 of file fat.h.

ATTR_SYSTEM

#define ATTR_SYSTEM   0x04

Definition at line 161 of file fat.h.

ATTR_VOLUMENAME

#define ATTR_VOLUMENAME   0x08

Definition at line 162 of file fat.h.

FAT12

#define FAT12   1

Definition at line 167 of file fat.h.

FAT16

#define FAT16   2

Definition at line 168 of file fat.h.

FAT32

#define FAT32   3

Definition at line 169 of file fat.h.

FATX16

#define FATX16   4

Definition at line 170 of file fat.h.

FATX32

#define FATX32   5

Definition at line 171 of file fat.h.

ISFATX

#define ISFATX

(

FT

)

((FT) == FATX16 || (FT) == FATX32)

Definition at line 173 of file fat.h.

Typedef Documentation

FAT32_BOOTSECTOR

typedef struct _FAT32_BOOTSECTOR FAT32_BOOTSECTOR

FAT_BOOTSECTOR

typedef struct _FAT_BOOTSECTOR FAT_BOOTSECTOR

FATX_BOOTSECTOR

typedef struct _FATX_BOOTSECTOR FATX_BOOTSECTOR

PDIRENTRY

typedef struct DIRENTRY * PDIRENTRY

PFAT32_BOOTSECTOR

typedef struct _FAT32_BOOTSECTOR * PFAT32_BOOTSECTOR

PFAT_BOOTSECTOR

typedef struct _FAT_BOOTSECTOR * PFAT_BOOTSECTOR

PFAT_FILE_INFO

typedef struct FAT_FILE_INFO * PFAT_FILE_INFO

PFAT_VOLUME_INFO

typedef struct _FAT_VOLUME_INFO* PFAT_VOLUME_INFO

Definition at line 146 of file fat.h.

PFATX_BOOTSECTOR

typedef struct _FATX_BOOTSECTOR * PFATX_BOOTSECTOR

PFATX_DIRENTRY

typedef struct FATX_DIRENTRY * PFATX_DIRENTRY

PLFN_DIRENTRY

typedef struct LFN_DIRENTRY * PLFN_DIRENTRY

Function Documentation

FatMount()

const DEVVTBL* FatMount

(

ULONG

DeviceId

)

Definition at line 1513 of file fat.c.

{
    PFAT_VOLUME_INFO Volume;
    UCHAR Buffer[512];
    PFAT_BOOTSECTOR BootSector = (PFAT_BOOTSECTOR)Buffer;
    PFAT32_BOOTSECTOR BootSector32 = (PFAT32_BOOTSECTOR)Buffer;
    PFATX_BOOTSECTOR BootSectorX = (PFATX_BOOTSECTOR)Buffer;
    FILEINFORMATION FileInformation;
    LARGE_INTEGER Position;
    ULONG Count;
    ULARGE_INTEGER SectorCount;
    ARC_STATUS Status;

    //
    // Allocate data for volume information
    //
    Volume = FrLdrTempAlloc(sizeof(FAT_VOLUME_INFO), TAG_FAT_VOLUME);
    if (!Volume)
        return NULL;
    RtlZeroMemory(Volume, sizeof(FAT_VOLUME_INFO));

    //
    // Read the BootSector
    //
    Position.HighPart = 0;
    Position.LowPart = 0;
    Status = ArcSeek(DeviceId, &Position, SeekAbsolute);
    if (Status != ESUCCESS)
    {
        FrLdrTempFree(Volume, TAG_FAT_VOLUME);
        return NULL;
    }
    Status = ArcRead(DeviceId, Buffer, sizeof(Buffer), &Count);
    if (Status != ESUCCESS || Count != sizeof(Buffer))
    {
        FrLdrTempFree(Volume, TAG_FAT_VOLUME);
        return NULL;
    }

    //
    // Check if BootSector is valid. If no, return early
    //
    if (!RtlEqualMemory(BootSector->FileSystemType, "FAT12   ", 8) &&
        !RtlEqualMemory(BootSector->FileSystemType, "FAT16   ", 8) &&
        !RtlEqualMemory(BootSector32->FileSystemType, "FAT32   ", 8) &&
        !RtlEqualMemory(BootSectorX->FileSystemType, "FATX", 4))
    {
        FrLdrTempFree(Volume, TAG_FAT_VOLUME);
        return NULL;
    }

    //
    // Determine sector count
    //
    Status = ArcGetFileInformation(DeviceId, &FileInformation);
    if (Status != ESUCCESS)
    {
        FrLdrTempFree(Volume, TAG_FAT_VOLUME);
        return NULL;
    }
    SectorCount.HighPart = FileInformation.EndingAddress.HighPart;
    SectorCount.LowPart = FileInformation.EndingAddress.LowPart;
    SectorCount.QuadPart /= SECTOR_SIZE;

    //
    // Keep device id
    //
    Volume->DeviceId = DeviceId;

    //
    // Really open the volume
    //
    if (!FatOpenVolume(Volume, BootSector, SectorCount.QuadPart))
    {
        FrLdrTempFree(Volume, TAG_FAT_VOLUME);
        return NULL;
    }

    //
    // Remember FAT volume information
    //
    FatVolumes[DeviceId] = Volume;

    //
    // Return success
    //
    return &FatFuncTable;
}