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116 lines
3 KiB
C
116 lines
3 KiB
C
/*
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* PROJECT: ReactOS File System Recognizer
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* LICENSE: GPL-2.0 (https://spdx.org/licenses/GPL-2.0)
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* PURPOSE: CDFS Recognizer
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* COPYRIGHT: Copyright 2002 Eric Kohl
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* Copyright 2007 Alex Ionescu <alex.ionescu@reactos.org>
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* Copyright 2017 Colin Finck <colin@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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#include "cdfs.h"
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/* FUNCTIONS ****************************************************************/
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BOOLEAN
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NTAPI
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FsRecIsCdfsVolume(IN PDEVICE_OBJECT DeviceObject,
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IN ULONG SectorSize)
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{
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BOOLEAN bReturnValue = FALSE;
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LARGE_INTEGER Offset;
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PVD_HEADER pVdHeader = NULL;
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PAGED_CODE();
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// Read the Primary Volume Descriptor.
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Offset.QuadPart = VD_HEADER_OFFSET;
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if (!FsRecReadBlock(DeviceObject, &Offset, sizeof(VD_HEADER), SectorSize, (PVOID*)&pVdHeader, NULL))
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{
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// We cannot read this block, so no reason to let the CDFS driver try it.
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goto Cleanup;
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}
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// Verify the fields.
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if (pVdHeader->Type != VD_TYPE_PRIMARY)
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goto Cleanup;
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DPRINT("pVdHeader->Type verified!\n");
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if (RtlCompareMemory(pVdHeader->Identifier, VD_IDENTIFIER, VD_IDENTIFIER_LENGTH) != VD_IDENTIFIER_LENGTH)
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goto Cleanup;
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DPRINT("pVdHeader->Identifier verified!\n");
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if (pVdHeader->Version != VD_VERSION)
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goto Cleanup;
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DPRINT("pVdHeader->Version verified! This is a CDFS volume!\n");
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bReturnValue = TRUE;
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Cleanup:
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if (pVdHeader)
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ExFreePool(pVdHeader);
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return bReturnValue;
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}
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NTSTATUS
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NTAPI
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FsRecCdfsFsControl(IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp)
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{
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PDEVICE_OBJECT MountDevice;
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ULONG SectorSize;
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PIO_STACK_LOCATION Stack;
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NTSTATUS Status;
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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 CDFS (ISO-9660) volume */
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if (FsRecIsCdfsVolume(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\\Cdfs");
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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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