misc.c File Reference

#include "mouclass.h"
#include <debug.h>

Include dependency graph for misc.c:

Go to the source code of this file.

Functions
static NTSTATUS NTAPI	ForwardIrpAndWaitCompletion (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp, IN PVOID Context)
NTSTATUS	ForwardIrpAndWait (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS NTAPI	ForwardIrpAndForget (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS	DuplicateUnicodeString (IN ULONG Flags, IN PCUNICODE_STRING SourceString, OUT PUNICODE_STRING DestinationString)

Variables
static IO_COMPLETION_ROUTINE	ForwardIrpAndWaitCompletion

Function Documentation

DuplicateUnicodeString()

NTSTATUS DuplicateUnicodeString	(	IN ULONG	Flags,
		IN PCUNICODE_STRING	SourceString,
		OUT PUNICODE_STRING	DestinationString
	)

Definition at line 71 of file misc.c.

{
    if (SourceString == NULL || DestinationString == NULL
     || SourceString->Length > SourceString->MaximumLength
     || (SourceString->Length == 0 && SourceString->MaximumLength > 0 && SourceString->Buffer == NULL)
     || Flags == RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING || Flags >= 4)
    {
        return STATUS_INVALID_PARAMETER;
    }


    if ((SourceString->Length == 0)
     && (Flags != (RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE |
                   RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING)))
    {
        DestinationString->Length = 0;
        DestinationString->MaximumLength = 0;
        DestinationString->Buffer = NULL;
    }
    else
    {
        USHORT DestMaxLength = SourceString->Length;

        if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
            DestMaxLength += sizeof(UNICODE_NULL);

        DestinationString->Buffer = ExAllocatePoolWithTag(PagedPool, DestMaxLength, CLASS_TAG);
        if (DestinationString->Buffer == NULL)
            return STATUS_NO_MEMORY;

        RtlCopyMemory(DestinationString->Buffer, SourceString->Buffer, SourceString->Length);
        DestinationString->Length = SourceString->Length;
        DestinationString->MaximumLength = DestMaxLength;

        if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
            DestinationString->Buffer[DestinationString->Length / sizeof(WCHAR)] = 0;
    }

    return STATUS_SUCCESS;
}

ForwardIrpAndForget()

NTSTATUS NTAPI ForwardIrpAndForget	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

Definition at line 57 of file misc.c.

{
    PDEVICE_OBJECT LowerDevice;

    ASSERT(!((PCOMMON_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->IsClassDO);
    LowerDevice = ((PPORT_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;

    IoSkipCurrentIrpStackLocation(Irp);
    return IoCallDriver(LowerDevice, Irp);
}

ForwardIrpAndWait()

NTSTATUS ForwardIrpAndWait	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

Definition at line 28 of file misc.c.

{
    PDEVICE_OBJECT LowerDevice;
    KEVENT Event;
    NTSTATUS Status;

    ASSERT(!((PCOMMON_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->IsClassDO);
    LowerDevice = ((PPORT_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;

    KeInitializeEvent(&Event, NotificationEvent, FALSE);
    IoCopyCurrentIrpStackLocationToNext(Irp);

    TRACE_(CLASS_NAME, "Calling lower device %p\n", LowerDevice);
    IoSetCompletionRoutine(Irp, ForwardIrpAndWaitCompletion, &Event, TRUE, TRUE, TRUE);

    Status = IoCallDriver(LowerDevice, Irp);
    if (Status == STATUS_PENDING)
    {
        Status = KeWaitForSingleObject(&Event, Suspended, KernelMode, FALSE, NULL);
        if (NT_SUCCESS(Status))
            Status = Irp->IoStatus.Status;
    }

    return Status;
}

ForwardIrpAndWaitCompletion()

static NTSTATUS NTAPI ForwardIrpAndWaitCompletion ( IN PDEVICE_OBJECT  DeviceObject, IN PIRP  Irp, IN PVOID  Context  )

static

Definition at line 17 of file misc.c.

{
    if (Irp->PendingReturned)
        KeSetEvent((PKEVENT)Context, IO_NO_INCREMENT, FALSE);
    return STATUS_MORE_PROCESSING_REQUIRED;
}

Variable Documentation

ForwardIrpAndWaitCompletion

IO_COMPLETION_ROUTINE ForwardIrpAndWaitCompletion

static

Definition at line 14 of file misc.c.

Referenced by ForwardIrpAndWait().