BOOLEAN
NTAPI
NpCommonRead(IN PFILE_OBJECT FileObject,
IN PVOID Buffer,
IN ULONG BufferSize,
OUT PIO_STATUS_BLOCK IoStatus,
IN PIRP Irp,
IN PLIST_ENTRY List)
{
NODE_TYPE_CODE NodeType;
PNP_DATA_QUEUE ReadQueue;
PNP_EVENT_BUFFER EventBuffer;
NTSTATUS Status;
ULONG NamedPipeEnd;
PNP_CCB Ccb;
PNP_NONPAGED_CCB NonPagedCcb;
BOOLEAN ReadOk;
PAGED_CODE();
IoStatus->Information = 0;
NodeType = NpDecodeFileObject(FileObject, NULL, &Ccb, &NamedPipeEnd);
if (!NodeType)
{
IoStatus->Status = STATUS_PIPE_DISCONNECTED;
return TRUE;
}
if (NodeType != NPFS_NTC_CCB)
{
IoStatus->Status = STATUS_INVALID_PARAMETER;
return TRUE;
}
NonPagedCcb = Ccb->NonPagedCcb;
ExAcquireResourceExclusiveLite(&NonPagedCcb->Lock, TRUE);
if (Ccb->NamedPipeState == FILE_PIPE_DISCONNECTED_STATE || Ccb->NamedPipeState == FILE_PIPE_LISTENING_STATE)
{
IoStatus->Status = Ccb->NamedPipeState != FILE_PIPE_DISCONNECTED_STATE ? STATUS_PIPE_LISTENING : STATUS_PIPE_DISCONNECTED;
ReadOk = TRUE;
goto Quickie;
}
ASSERT((Ccb->NamedPipeState == FILE_PIPE_CONNECTED_STATE) || (Ccb->NamedPipeState == FILE_PIPE_CLOSING_STATE));
if ((NamedPipeEnd == FILE_PIPE_SERVER_END && Ccb->Fcb->NamedPipeConfiguration == FILE_PIPE_OUTBOUND) ||
(NamedPipeEnd == FILE_PIPE_CLIENT_END && Ccb->Fcb->NamedPipeConfiguration == FILE_PIPE_INBOUND))
{
IoStatus->Status = STATUS_INVALID_PARAMETER;
ReadOk = TRUE;
goto Quickie;
}
if (NamedPipeEnd == FILE_PIPE_SERVER_END)
{
ReadQueue = &Ccb->DataQueue[FILE_PIPE_INBOUND];
}
else
{
ReadQueue = &Ccb->DataQueue[FILE_PIPE_OUTBOUND];
}
EventBuffer = NonPagedCcb->EventBuffer[NamedPipeEnd];
if (ReadQueue->QueueState == WriteEntries)
{
*IoStatus = NpReadDataQueue(ReadQueue,
FALSE,
FALSE,
Buffer,
BufferSize,
Ccb->ReadMode[NamedPipeEnd],
Ccb,
List);
if (!NT_SUCCESS(IoStatus->Status))
{
ReadOk = TRUE;
goto Quickie;
}
ReadOk = TRUE;
if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
goto Quickie;
}
if (Ccb->NamedPipeState == FILE_PIPE_CLOSING_STATE)
{
IoStatus->Status = STATUS_PIPE_BROKEN;
ReadOk = TRUE;
if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
goto Quickie;
}
if (Ccb->CompletionMode[NamedPipeEnd] == FILE_PIPE_COMPLETE_OPERATION)
{
IoStatus->Status = STATUS_PIPE_EMPTY;
ReadOk = TRUE;
if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
goto Quickie;
}
if (!Irp)
{
ReadOk = FALSE;
goto Quickie;
}
Status = NpAddDataQueueEntry(NamedPipeEnd,
Ccb,
ReadQueue,
ReadEntries,
Buffered,
BufferSize,
Irp,
NULL,
0);
IoStatus->Status = Status;
if (!NT_SUCCESS(Status))
{
ReadOk = FALSE;
}
else
{
ReadOk = TRUE;
if (EventBuffer) KeSetEvent(EventBuffer->Event, IO_NO_INCREMENT, FALSE);
}
Quickie:
ExReleaseResourceLite(&Ccb->NonPagedCcb->Lock);
return ReadOk;
}
NTSTATUS
NTAPI
NpPeek(IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PLIST_ENTRY List)
{
PIO_STACK_LOCATION IoStack;
NODE_TYPE_CODE Type;
ULONG OutputLength;
ULONG NamedPipeEnd;
PNP_CCB Ccb;
PFILE_PIPE_PEEK_BUFFER PeekBuffer;
PNP_DATA_QUEUE DataQueue;
ULONG_PTR BytesPeeked;
IO_STATUS_BLOCK IoStatus;
NTSTATUS Status;
PNP_DATA_QUEUE_ENTRY DataEntry;
PAGED_CODE();
IoStack = IoGetCurrentIrpStackLocation(Irp);
OutputLength = IoStack->Parameters.FileSystemControl.OutputBufferLength;
Type = NpDecodeFileObject(IoStack->FileObject, NULL, &Ccb, &NamedPipeEnd);
if (!Type)
{
return STATUS_PIPE_DISCONNECTED;
}
if ((Type != NPFS_NTC_CCB) &&
(OutputLength < FIELD_OFFSET(FILE_PIPE_PEEK_BUFFER, Data)))
{
return STATUS_INVALID_PARAMETER;
}
PeekBuffer = (PFILE_PIPE_PEEK_BUFFER)Irp->AssociatedIrp.SystemBuffer;
if (NamedPipeEnd != FILE_PIPE_CLIENT_END)
{
if (NamedPipeEnd != FILE_PIPE_SERVER_END)
{
NpBugCheck(NamedPipeEnd, 0, 0);
}
DataQueue = &Ccb->DataQueue[FILE_PIPE_INBOUND];
}
else
{
DataQueue = &Ccb->DataQueue[FILE_PIPE_OUTBOUND];
}
if (Ccb->NamedPipeState != FILE_PIPE_CONNECTED_STATE)
{
if (Ccb->NamedPipeState != FILE_PIPE_CLOSING_STATE)
{
return STATUS_INVALID_PIPE_STATE;
}
if (DataQueue->QueueState != WriteEntries)
{
return STATUS_PIPE_BROKEN;
}
}
PeekBuffer->NamedPipeState = 0;
PeekBuffer->ReadDataAvailable = 0;
PeekBuffer->NumberOfMessages = 0;
PeekBuffer->MessageLength = 0;
PeekBuffer->NamedPipeState = Ccb->NamedPipeState;
BytesPeeked = FIELD_OFFSET(FILE_PIPE_PEEK_BUFFER, Data);
if (DataQueue->QueueState == WriteEntries)
{
DataEntry = CONTAINING_RECORD(DataQueue->Queue.Flink,
NP_DATA_QUEUE_ENTRY,
QueueEntry);
ASSERT((DataEntry->DataEntryType == Buffered) || (DataEntry->DataEntryType == Unbuffered));
PeekBuffer->ReadDataAvailable = DataQueue->BytesInQueue - DataQueue->ByteOffset;
if (Ccb->Fcb->NamedPipeType == FILE_PIPE_MESSAGE_TYPE)
{
PeekBuffer->NumberOfMessages = DataQueue->EntriesInQueue;
PeekBuffer->MessageLength = DataEntry->DataSize - DataQueue->ByteOffset;
}
if (OutputLength == FIELD_OFFSET(FILE_PIPE_PEEK_BUFFER, Data))
{
Status = PeekBuffer->ReadDataAvailable ? STATUS_BUFFER_OVERFLOW : STATUS_SUCCESS;
}
else
{
IoStatus = NpReadDataQueue(DataQueue,
TRUE,
FALSE,
PeekBuffer->Data,
OutputLength - FIELD_OFFSET(FILE_PIPE_PEEK_BUFFER, Data),
Ccb->Fcb->NamedPipeType == FILE_PIPE_MESSAGE_TYPE,
Ccb,
List);
Status = IoStatus.Status;
BytesPeeked += IoStatus.Information;
}
}
else
{
Status = STATUS_SUCCESS;
}
Irp->IoStatus.Information = BytesPeeked;
return Status;
}
