static NTSTATUS HandleReadIrp	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp,
		BOOLEAN	IsInStartIo
	)		`[static]`

Definition at line 733 of file mouclass.c.

Referenced by ClassCallback(), ClassRead(), and ClassStartIo().

{
    PCLASS_DEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension;
    NTSTATUS Status;
    KIRQL OldIrql;

    TRACE_(CLASS_NAME, "HandleReadIrp(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);

    ASSERT(DeviceExtension->Common.IsClassDO);

    if (DeviceExtension->InputCount > 0)
    {
        SIZE_T NumberOfEntries;

        NumberOfEntries = MIN(
            DeviceExtension->InputCount,
            IoGetCurrentIrpStackLocation(Irp)->Parameters.Read.Length / sizeof(MOUSE_INPUT_DATA));

        Status = FillEntries(
            DeviceObject,
            Irp,
            DeviceExtension->PortData,
            NumberOfEntries);

        if (NT_SUCCESS(Status))
        {
            if (DeviceExtension->InputCount > NumberOfEntries)
            {
                RtlMoveMemory(
                    &DeviceExtension->PortData[0],
                    &DeviceExtension->PortData[NumberOfEntries],
                    (DeviceExtension->InputCount - NumberOfEntries) * sizeof(MOUSE_INPUT_DATA));
            }

            DeviceExtension->InputCount -= NumberOfEntries;

            Irp->IoStatus.Information = NumberOfEntries * sizeof(MOUSE_INPUT_DATA);
        }

        /* Go to next packet and complete this request */
        Irp->IoStatus.Status = Status;

        (VOID)IoSetCancelRoutine(Irp, NULL);
        IoCompleteRequest(Irp, IO_MOUSE_INCREMENT);
        DeviceExtension->PendingIrp = NULL;
    }
    else
    {
        IoAcquireCancelSpinLock(&OldIrql);
        if (Irp->Cancel)
        {
            DeviceExtension->PendingIrp = NULL;
            Status = STATUS_CANCELLED;
        }
        else
        {
            IoMarkIrpPending(Irp);
            DeviceExtension->PendingIrp = Irp;
            (VOID)IoSetCancelRoutine(Irp, ClassCancelRoutine);
            Status = STATUS_PENDING;
        }
        IoReleaseCancelSpinLock(OldIrql);
    }
    return Status;
}

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