mirror of
https://github.com/reactos/reactos.git
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150 lines
3.9 KiB
C
150 lines
3.9 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS File System Recognizer
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* FILE: drivers/filesystems/fs_rec/udfs.c
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* PURPOSE: USFS Recognizer
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* PROGRAMMER: Alex Ionescu (alex.ionescu@reactos.org)
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* Eric Kohl
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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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#include "udfs.h"
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/* FUNCTIONS ****************************************************************/
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BOOLEAN
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NTAPI
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FsRecIsUdfsVolume(IN PDEVICE_OBJECT DeviceObject,
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IN ULONG SectorSize)
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{
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PVOLSTRUCTDESC VolumeStructDesc = NULL;
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LARGE_INTEGER Offset;
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ULONG State = 0;
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PAGED_CODE();
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Offset.QuadPart = UDFS_VRS_START_OFFSET;
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while (TRUE)
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{
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if (!FsRecReadBlock(DeviceObject,
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&Offset,
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SectorSize,
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SectorSize,
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(PVOID)&VolumeStructDesc,
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NULL))
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{
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break;
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}
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switch (State)
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{
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case 0:
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if (!strncmp((const char*)VolumeStructDesc->Ident,
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VSD_STD_ID_BEA01,
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VSD_STD_ID_LEN))
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{
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State = 1;
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}
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else
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{
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ExFreePool(VolumeStructDesc);
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return FALSE;
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}
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break;
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case 1:
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if (!strncmp((const char*)VolumeStructDesc->Ident,
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VSD_STD_ID_NSR03,
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VSD_STD_ID_LEN) ||
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!strncmp((const char*)VolumeStructDesc->Ident,
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VSD_STD_ID_NSR02,
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VSD_STD_ID_LEN))
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{
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State = 2;
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}
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break;
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case 2:
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if (!strncmp((const char*)VolumeStructDesc->Ident,
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VSD_STD_ID_TEA01,
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VSD_STD_ID_LEN))
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{
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ExFreePool(VolumeStructDesc);
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return TRUE;
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}
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break;
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}
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Offset.QuadPart += SectorSize;
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if (Offset.QuadPart == UDFS_AVDP_SECTOR)
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{
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ExFreePool(VolumeStructDesc);
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return FALSE;
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}
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}
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ExFreePool(VolumeStructDesc);
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return TRUE;
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}
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NTSTATUS
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NTAPI
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FsRecUdfsFsControl(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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ULONG SectorSize;
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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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/* Check if it's an actual FAT volume */
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if (FsRecIsUdfsVolume(MountDevice, SectorSize))
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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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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\\Udfs");
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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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