filter.cpp File Reference

#include "udffs.h"

Include dependency graph for filter.cpp:

Go to the source code of this file.

Macros
#define	UDF_BUG_CHECK_ID   UDF_FILE_FILTER

Functions
VOID	UDFCheckOtherFS (PDEVICE_OBJECT deviceObject)
VOID	UDFCheckOtherFSByName (PCWSTR DeviceObjectName)

Macro Definition Documentation

UDF_BUG_CHECK_ID

#define UDF_BUG_CHECK_ID   UDF_FILE_FILTER

Definition at line 24 of file filter.cpp.

Function Documentation

UDFCheckOtherFS()

VOID UDFCheckOtherFS

(

PDEVICE_OBJECT

deviceObject

)

Definition at line 27 of file filter.cpp.

                                             {
    PFILTER_DEV_EXTENSION FilterDevExt;
    PDEVICE_OBJECT filterDeviceObject;
    NTSTATUS RC;

//    BrutePoint();

    // Acquire GlobalDataResource
    UDFAcquireResourceExclusive(&(UDFGlobalData.GlobalDataResource), TRUE);

    if (!NT_SUCCESS(RC = IoCreateDevice(
            UDFGlobalData.DriverObject,     // our driver object
            sizeof(FILTER_DEV_EXTENSION),   // don't need an extension
                                            //   for this object
            NULL,                           // name - can be used to
                                            //   "open" the driver
                                            //    see the R.Nagar's book
                                            //    for alternate choices
            FILE_DEVICE_CD_ROM_FILE_SYSTEM,
            0,                              // no special characteristics
                                            // do not want this as an
                                            //  exclusive device, though
                                            //  we might
            FALSE,
            &filterDeviceObject))) {
                // failed to create a filter device object, leave ...
        // Release the global resource.
        UDFReleaseResource( &(UDFGlobalData.GlobalDataResource) );
        return;
    }
    FilterDevExt = (PFILTER_DEV_EXTENSION)filterDeviceObject->DeviceExtension;
    // Zero it out (typically this has already been done by the I/O
    // Manager but it does not hurt to do it again)!
    RtlZeroMemory(FilterDevExt, sizeof(FILTER_DEV_EXTENSION));

    // Initialize the signature fields
    FilterDevExt->NodeIdentifier.NodeType = UDF_NODE_TYPE_FILTER_DEVOBJ;
    FilterDevExt->NodeIdentifier.NodeSize = sizeof(FILTER_DEV_EXTENSION);

    UDFPrint(("UDFCheckOtherFS: Attaching filter devobj %x to FS devobj %x \n",filterDeviceObject,deviceObject));
    deviceObject = IoGetAttachedDevice( deviceObject );
    UDFPrint(("UDFCheckOtherFS: top devobj is %x \n",deviceObject));
    FilterDevExt->lowerFSDeviceObject = deviceObject;

    RC = IoAttachDeviceByPointer( filterDeviceObject, deviceObject );
    if (!NT_SUCCESS(RC)) {
        IoDeleteDevice( filterDeviceObject );
    } else {
        filterDeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
    }
    // Release the global resource.
    UDFReleaseResource( &(UDFGlobalData.GlobalDataResource) );
}

Referenced by UDFCheckOtherFSByName().

UDFCheckOtherFSByName()

VOID UDFCheckOtherFSByName

(

PCWSTR

DeviceObjectName

)

Definition at line 82 of file filter.cpp.

                                               {
    PFILE_OBJECT fileObject;
    PDEVICE_OBJECT deviceObject;
    UNICODE_STRING nameString;
    NTSTATUS RC;

    UDFPrint(("UDFCheckOtherFSByName: trying %s \n",DeviceObjectName));

    RtlInitUnicodeString( &nameString, DeviceObjectName );
    RC = IoGetDeviceObjectPointer(
                &nameString,
                FILE_READ_ATTRIBUTES,
                &fileObject,
                &deviceObject
                );

    if (!NT_SUCCESS(RC)) {
        UDFPrint(("UDFCheckOtherFSByName: error %x while calling IoGetDeviceObjectPointer \n",RC));
        return;
    }

    UDFCheckOtherFS(deviceObject);

    ObDereferenceObject( fileObject );
}