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