167 lines
4.2 KiB
C
167 lines
4.2 KiB
C
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#include "pch.h"
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NTSTATUS
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PptPdoQueryInformation(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine is used to query the end of file information on
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the opened parallel port. Any other file information request
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is retured with an invalid parameter.
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This routine always returns an end of file of 0.
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Arguments:
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DeviceObject - Supplies the device object.
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Irp - Supplies the I/O request packet.
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Return Value:
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STATUS_SUCCESS - Success.
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STATUS_INVALID_PARAMETER - Invalid file information request.
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STATUS_BUFFER_TOO_SMALL - Buffer too small.
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--*/
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{
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NTSTATUS Status;
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PIO_STACK_LOCATION IrpSp;
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PFILE_STANDARD_INFORMATION StdInfo;
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PFILE_POSITION_INFORMATION PosInfo;
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PPDO_EXTENSION Extension = DeviceObject->DeviceExtension;
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UNREFERENCED_PARAMETER(DeviceObject);
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//
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// bail out if device has been removed
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//
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if(Extension->DeviceStateFlags & (PPT_DEVICE_REMOVED|PPT_DEVICE_SURPRISE_REMOVED) ) {
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P4CompleteRequest( Irp, STATUS_DEVICE_REMOVED, Irp->IoStatus.Information );
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return STATUS_DEVICE_REMOVED;
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}
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Irp->IoStatus.Information = 0;
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IrpSp = IoGetCurrentIrpStackLocation(Irp);
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switch (IrpSp->Parameters.QueryFile.FileInformationClass) {
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case FileStandardInformation:
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if (IrpSp->Parameters.QueryFile.Length < sizeof(FILE_STANDARD_INFORMATION)) {
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Status = STATUS_BUFFER_TOO_SMALL;
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} else {
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StdInfo = Irp->AssociatedIrp.SystemBuffer;
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StdInfo->AllocationSize.QuadPart = 0;
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StdInfo->EndOfFile = StdInfo->AllocationSize;
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StdInfo->NumberOfLinks = 0;
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StdInfo->DeletePending = FALSE;
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StdInfo->Directory = FALSE;
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Irp->IoStatus.Information = sizeof(FILE_STANDARD_INFORMATION);
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Status = STATUS_SUCCESS;
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}
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break;
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case FilePositionInformation:
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if (IrpSp->Parameters.SetFile.Length < sizeof(FILE_POSITION_INFORMATION)) {
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Status = STATUS_BUFFER_TOO_SMALL;
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} else {
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PosInfo = Irp->AssociatedIrp.SystemBuffer;
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PosInfo->CurrentByteOffset.QuadPart = 0;
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Irp->IoStatus.Information = sizeof(FILE_POSITION_INFORMATION);
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Status = STATUS_SUCCESS;
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}
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break;
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default:
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Status = STATUS_INVALID_PARAMETER;
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break;
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}
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P4CompleteRequest( Irp, Status, Irp->IoStatus.Information );
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return Status;
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}
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NTSTATUS
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PptPdoSetInformation(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine is used to set the end of file information on
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the opened parallel port. Any other file information request
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is retured with an invalid parameter.
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This routine always ignores the actual end of file since
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the query information code always returns an end of file of 0.
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Arguments:
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DeviceObject - Supplies the device object.
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Irp - Supplies the I/O request packet.
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Return Value:
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STATUS_SUCCESS - Success.
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STATUS_INVALID_PARAMETER - Invalid file information request.
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--*/
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{
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NTSTATUS Status;
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FILE_INFORMATION_CLASS fileInfoClass;
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PPDO_EXTENSION Extension = DeviceObject->DeviceExtension;
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UNREFERENCED_PARAMETER(DeviceObject);
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//
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// bail out if device has been removed
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//
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if(Extension->DeviceStateFlags & (PPT_DEVICE_REMOVED|PPT_DEVICE_SURPRISE_REMOVED) ) {
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return P4CompleteRequest( Irp, STATUS_DEVICE_REMOVED, Irp->IoStatus.Information );
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}
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Irp->IoStatus.Information = 0;
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fileInfoClass = IoGetCurrentIrpStackLocation(Irp)->Parameters.SetFile.FileInformationClass;
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if (fileInfoClass == FileEndOfFileInformation) {
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Status = STATUS_SUCCESS;
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} else {
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Status = STATUS_INVALID_PARAMETER;
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}
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return P4CompleteRequest( Irp, Status, Irp->IoStatus.Information );
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}
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