NTSTATUS
NTAPI
NtfsFsdRead(PDEVICE_OBJECT DeviceObject,
PIRP Irp)
{
PDEVICE_EXTENSION DeviceExt;
PIO_STACK_LOCATION Stack;
PFILE_OBJECT FileObject;
PVOID Buffer;
ULONG ReadLength;
LARGE_INTEGER ReadOffset;
ULONG ReturnedReadLength = 0;
NTSTATUS Status = STATUS_SUCCESS;
DPRINT("NtfsRead(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
DeviceExt = DeviceObject->DeviceExtension;
Stack = IoGetCurrentIrpStackLocation(Irp);
FileObject = Stack->FileObject;
ReadLength = Stack->Parameters.Read.Length;
ReadOffset = Stack->Parameters.Read.ByteOffset;
Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
Status = NtfsReadFile(DeviceExt,
FileObject,
Buffer,
ReadLength,
ReadOffset.u.LowPart,
Irp->Flags,
&ReturnedReadLength);
if (NT_SUCCESS(Status))
{
if (FileObject->Flags & FO_SYNCHRONOUS_IO)
{
FileObject->CurrentByteOffset.QuadPart =
ReadOffset.QuadPart + ReturnedReadLength;
}
Irp->IoStatus.Information = ReturnedReadLength;
}
else
{
Irp->IoStatus.Information = 0;
}
Irp->IoStatus.Status = Status;
IoCompleteRequest(Irp,IO_NO_INCREMENT);
return Status;
}
//Implementation of DeviceRead routine.
static DWORD NtfsDeviceRead(__COMMON_OBJECT* pDrv,__COMMON_OBJECT* pDev,__DRCB* pDrcb)
{
__NTFS_FILE_OBJECT* pFileObject = NULL;
BYTE* pBuffer = NULL;
UINT_32 toReadSize = 0;
UINT_32 ReadSize = 0;
if((NULL == pDev) || (NULL == pDrcb))
{
return 0;
}
pFileObject = (__NTFS_FILE_OBJECT*)((__DEVICE_OBJECT*)pDev)->lpDevExtension;
toReadSize = pDrcb->dwOutputLen;
pBuffer = (BYTE*)pDrcb->lpOutputBuffer;
if(NtfsReadFile(pFileObject,pBuffer,toReadSize,&ReadSize,NULL))
{
return ReadSize;
}
else
{
return 0;
}
}
