filter.c File Reference

#include "kmixer.h"
#include <swenum.h>
#include <debug.h>

Include dependency graph for filter.c:

Go to the source code of this file.

Macros
#define	YDEBUG

Functions
NTSTATUS NTAPI	Dispatch_fnDeviceIoControl (PDEVICE_OBJECT DeviceObject, PIRP Irp)
NTSTATUS NTAPI	Dispatch_fnClose (PDEVICE_OBJECT DeviceObject, PIRP Irp)
NTSTATUS NTAPI	DispatchCreateKMixPin (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS NTAPI	DispatchCreateKMixAllocator (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS NTAPI	DispatchCreateKMix (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS NTAPI	KMixAllocateDeviceHeader (IN PKMIXER_DEVICE_EXT DeviceExtension)

Variables
static KSDISPATCH_TABLE	DispatchTable

Macro Definition Documentation

YDEBUG

#define YDEBUG

Definition at line 13 of file filter.c.

Function Documentation

Dispatch_fnClose()

NTSTATUS NTAPI Dispatch_fnClose	(	PDEVICE_OBJECT	DeviceObject,
		PIRP	Irp
	)

Definition at line 33 of file filter.c.

{
    UNIMPLEMENTED;

    Irp->IoStatus.Status = STATUS_SUCCESS;
    Irp->IoStatus.Information = 0;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return STATUS_SUCCESS;
}

Dispatch_fnDeviceIoControl()

NTSTATUS NTAPI Dispatch_fnDeviceIoControl	(	PDEVICE_OBJECT	DeviceObject,
		PIRP	Irp
	)

Definition at line 18 of file filter.c.

{
    UNIMPLEMENTED;
    DbgBreakPoint();

    Irp->IoStatus.Status = STATUS_UNSUCCESSFUL;
    Irp->IoStatus.Information = 0;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return STATUS_UNSUCCESSFUL;
}

DispatchCreateKMix()

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

Definition at line 101 of file filter.c.

{
    NTSTATUS Status;
    KSOBJECT_HEADER ObjectHeader;
    PKSOBJECT_CREATE_ITEM CreateItem;
    PKMIXER_DEVICE_EXT DeviceExtension;

    DPRINT("DispatchCreateKMix entered\n");

    /* check if the request was from usermode */
    if (Irp->RequestorMode == UserMode)
    {
        /* deny access from usermode */
        Irp->IoStatus.Status = STATUS_INVALID_DEVICE_REQUEST;
        Irp->IoStatus.Information = 0;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return STATUS_INVALID_DEVICE_REQUEST;
    }

    /* get device extension */
    DeviceExtension = (PKMIXER_DEVICE_EXT)DeviceObject->DeviceExtension;

#if 0
    /* reference the software bus object */
    Status = KsReferenceSoftwareBusObject(DeviceExtension->KsDeviceHeader);

    if (!NT_SUCCESS(Status))
    {
        /* failed to reference bus object */
        Irp->IoStatus.Status = Status;
        Irp->IoStatus.Information = 0;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return Status;
    }
#endif

   /* allocate create item */
    CreateItem = ExAllocatePool(NonPagedPool, sizeof(KSOBJECT_CREATE_ITEM) * 2);
    if (!CreateItem)
    {
        /* not enough memory */
        Irp->IoStatus.Information = 0;
        Irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    /* zero create struct */
    RtlZeroMemory(CreateItem, sizeof(KSOBJECT_CREATE_ITEM) * 2);

    /* initialize pin create item */
    CreateItem[0].Create = DispatchCreateKMixPin;
    RtlInitUnicodeString(&CreateItem[0].ObjectClass, KSSTRING_Pin);
    CreateItem[1].Create = DispatchCreateKMixAllocator;
    RtlInitUnicodeString(&CreateItem[1].ObjectClass, KSSTRING_Allocator);

    /* allocate object header */
    Status = KsAllocateObjectHeader(&ObjectHeader, 2, CreateItem, Irp, &DispatchTable);

    if (!NT_SUCCESS(Status))
    {
        /* failed to allocate object header */
        ExFreePool(CreateItem);
        KsDereferenceSoftwareBusObject(DeviceExtension->KsDeviceHeader);
    }

    DPRINT("KsAllocateObjectHeader result %x\n", Status);
    /* complete the irp */
    Irp->IoStatus.Information = 0;
    Irp->IoStatus.Status = Status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return Status;
}

Referenced by KMixAllocateDeviceHeader().

DispatchCreateKMixAllocator()

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

Definition at line 82 of file filter.c.

{
    NTSTATUS Status;

    /* create the allocator */
    Status = KsCreateDefaultAllocator(Irp);

    /* save result */
    Irp->IoStatus.Status = Status;
    /* complete the request */
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    /* done */
    return Status;
}

Referenced by DispatchCreateKMix().

DispatchCreateKMixPin()

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

Definition at line 61 of file filter.c.

{
    NTSTATUS Status;

    DPRINT("DispatchCreateKMix entered\n");

    /* create the pin */
    Status = CreatePin(Irp);

    /* save result */
    Irp->IoStatus.Status = Status;
    /* complete the request */
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    /* done */
    return Status;
}

Referenced by DispatchCreateKMix().

KMixAllocateDeviceHeader()

NTSTATUS NTAPI KMixAllocateDeviceHeader

(

IN PKMIXER_DEVICE_EXT

DeviceExtension

)

Definition at line 179 of file filter.c.

{
    NTSTATUS Status;
    PKSOBJECT_CREATE_ITEM CreateItem;

    /* allocate create item */
    CreateItem = ExAllocatePool(NonPagedPool, sizeof(KSOBJECT_CREATE_ITEM) * 2);
    if (!CreateItem)
        return STATUS_INSUFFICIENT_RESOURCES;

    /* initialize create item struct */
    RtlZeroMemory(CreateItem, sizeof(KSOBJECT_CREATE_ITEM) * 2);
    CreateItem[0].Create = DispatchCreateKMix;
    RtlInitUnicodeString(&CreateItem[0].ObjectClass, L"GLOBAL");
    CreateItem[1].Create = DispatchCreateKMix;
    RtlInitUnicodeString(&CreateItem[1].ObjectClass, KSSTRING_Filter);

    Status = KsAllocateDeviceHeader(&DeviceExtension->KsDeviceHeader,
                                    2,
                                    CreateItem);
    return Status;
}

Referenced by KMix_AddDevice().

Variable Documentation

DispatchTable

KSDISPATCH_TABLE DispatchTable

static

Initial value:

=
{
    Dispatch_fnDeviceIoControl,
    KsDispatchInvalidDeviceRequest,
    KsDispatchInvalidDeviceRequest,
    KsDispatchInvalidDeviceRequest,
    Dispatch_fnClose,
    KsDispatchInvalidDeviceRequest,
    KsDispatchInvalidDeviceRequest,
    KsDispatchFastIoDeviceControlFailure,
    KsDispatchFastWriteFailure,
    KsDispatchFastWriteFailure,
}

Definition at line 45 of file filter.c.