mirror of
https://github.com/reactos/reactos.git
synced 2024-06-15 17:11:52 +00:00
131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/*
|
|
* PROJECT: ReactOS File System Recognizer
|
|
* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
|
|
* PURPOSE: FATX Recognizer
|
|
* COPYRIGHT: Copyright 2022 Hervé Poussineau <hpoussin@reactos.org>
|
|
*/
|
|
|
|
/* INCLUDES *****************************************************************/
|
|
|
|
#include "fs_rec.h"
|
|
|
|
#define NDEBUG
|
|
#include <debug.h>
|
|
|
|
/* TYPES ****************************************************************/
|
|
|
|
#include <pshpack1.h>
|
|
typedef struct _FATX_BOOT_SECTOR
|
|
{
|
|
UCHAR SysType[4];
|
|
ULONG VolumeId;
|
|
ULONG SectorsPerCluster;
|
|
USHORT FatCount;
|
|
ULONG Reserved;
|
|
UCHAR Unused[4078];
|
|
} FATX_BOOT_SECTOR, *PFATX_BOOT_SECTOR;
|
|
#include <poppack.h>
|
|
|
|
/* FUNCTIONS ****************************************************************/
|
|
|
|
BOOLEAN
|
|
NTAPI
|
|
FsRecIsFatxVolume(IN PFATX_BOOT_SECTOR BootSector)
|
|
{
|
|
BOOLEAN Result = TRUE;
|
|
|
|
PAGED_CODE();
|
|
|
|
if (BootSector->SysType[0] != 'F' ||
|
|
BootSector->SysType[1] != 'A' ||
|
|
BootSector->SysType[2] != 'T' ||
|
|
BootSector->SysType[3] != 'X')
|
|
{
|
|
/* Fail */
|
|
Result = FALSE;
|
|
}
|
|
else if (BootSector->SectorsPerCluster != 1 &&
|
|
BootSector->SectorsPerCluster != 2 &&
|
|
BootSector->SectorsPerCluster != 4 &&
|
|
BootSector->SectorsPerCluster != 8 &&
|
|
BootSector->SectorsPerCluster != 16 &&
|
|
BootSector->SectorsPerCluster != 32 &&
|
|
BootSector->SectorsPerCluster != 64 &&
|
|
BootSector->SectorsPerCluster != 128)
|
|
{
|
|
/* Fail */
|
|
Result = FALSE;
|
|
}
|
|
|
|
/* Return the result */
|
|
return Result;
|
|
}
|
|
|
|
NTSTATUS
|
|
NTAPI
|
|
FsRecFatxFsControl(IN PDEVICE_OBJECT DeviceObject,
|
|
IN PIRP Irp)
|
|
{
|
|
PIO_STACK_LOCATION Stack;
|
|
NTSTATUS Status;
|
|
PDEVICE_OBJECT MountDevice;
|
|
PFATX_BOOT_SECTOR Bpb = NULL;
|
|
ULONG SectorSize;
|
|
LARGE_INTEGER Offset = {{0, 0}};
|
|
BOOLEAN DeviceError = FALSE;
|
|
PAGED_CODE();
|
|
|
|
/* Get the I/O Stack and check the function type */
|
|
Stack = IoGetCurrentIrpStackLocation(Irp);
|
|
switch (Stack->MinorFunction)
|
|
{
|
|
case IRP_MN_MOUNT_VOLUME:
|
|
|
|
/* Assume failure */
|
|
Status = STATUS_UNRECOGNIZED_VOLUME;
|
|
|
|
/* Get the device object and request the sector size */
|
|
MountDevice = Stack->Parameters.MountVolume.DeviceObject;
|
|
if (FsRecGetDeviceSectorSize(MountDevice, &SectorSize))
|
|
{
|
|
/* Try to read the BPB */
|
|
if (FsRecReadBlock(MountDevice,
|
|
&Offset,
|
|
512,
|
|
SectorSize,
|
|
(PVOID)&Bpb,
|
|
&DeviceError))
|
|
{
|
|
/* Check if it's an actual FAT volume */
|
|
if (FsRecIsFatxVolume(Bpb))
|
|
{
|
|
/* It is! */
|
|
Status = STATUS_FS_DRIVER_REQUIRED;
|
|
}
|
|
}
|
|
|
|
/* Free the boot sector if we have one */
|
|
ExFreePool(Bpb);
|
|
}
|
|
|
|
break;
|
|
|
|
case IRP_MN_LOAD_FILE_SYSTEM:
|
|
|
|
/* Load the file system */
|
|
Status = FsRecLoadFileSystem(DeviceObject,
|
|
L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\vfatfs");
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Invalid request */
|
|
Status = STATUS_INVALID_DEVICE_REQUEST;
|
|
}
|
|
|
|
/* Return Status */
|
|
return Status;
|
|
}
|
|
|
|
/* EOF */
|