[arty] 13474: Made a nice function CantReadMore which tells if we can't possibly fill

Made a nice function CantReadMore which tells if we can't possibly fill
the buffer any longer, and don't have waiting data.
Return an EOF in every case where a read could hit EOF from tcpip,
Return a hard error thereafter.
Modified: trunk/reactos/drivers/net/afd/afd/read.c
  _____

Modified: trunk/reactos/drivers/net/afd/afd/read.c
--- trunk/reactos/drivers/net/afd/afd/read.c	2005-02-08 22:52:16 UTC
(rev 13473)
+++ trunk/reactos/drivers/net/afd/afd/read.c	2005-02-09 08:38:46 UTC
(rev 13474)
@@ -28,6 +28,13 @@

static VOID ProcessClose( PAFD_FCB FCB );

+BOOLEAN CantReadMore( PAFD_FCB FCB ) {
+    UINT BytesAvailable = FCB->Recv.Content - FCB->Recv.BytesUsed;
+    
+    return !BytesAvailable && 
+        (FCB->PollState & (AFD_EVENT_CLOSE | AFD_EVENT_DISCONNECT));
+}
+
 NTSTATUS TryToSatisfyRecvRequestFromBuffer( PAFD_FCB FCB,
    				    PAFD_RECV_INFO RecvReq,
    				    PUINT TotalBytesCopied ) {
@@ -41,7 +48,7 @@
     AFD_DbgPrint(MID_TRACE,("Called, BytesAvailable = %d\n",
    		    BytesAvailable));

-    if( FCB->PollState & AFD_EVENT_CLOSE ) return STATUS_SUCCESS;
+    if( CantReadMore(FCB) ) return STATUS_SUCCESS;
     if( !BytesAvailable ) return STATUS_PENDING;

Map = (PAFD_MAPBUF)(RecvReq->BufferArray + RecvReq->BufferCount);
@@ -213,6 +220,24 @@

Status = STATUS_SUCCESS;
     } else {
+        /* Success here means that we got an EOF.  Close all pending
reads
+         * with EOF.  Data won't have been available before. */
+        while( !IsListEmpty( &FCB->PendingIrpList[FUNCTION_RECV] ) ) {
+            NextIrpEntry = 
+                RemoveHeadList(&FCB->PendingIrpList[FUNCTION_RECV]);
+            NextIrp = 
+                CONTAINING_RECORD(NextIrpEntry, IRP,
Tail.Overlay.ListEntry);
+            NextIrpSp = IoGetCurrentIrpStackLocation( NextIrp );
+            RecvReq =
NextIrpSp->Parameters.DeviceIoControl.Type3InputBuffer;
+            
+            AFD_DbgPrint(MID_TRACE,("Completing recv %x (%d)\n",
NextIrp,
+                                    TotalBytesCopied));
+            UnlockBuffers( RecvReq->BufferArray, 
+                           RecvReq->BufferCount, FALSE );
+            NextIrp->IoStatus.Status = Status;
+            NextIrp->IoStatus.Information = 0;
+            IoCompleteRequest( NextIrp, IO_NETWORK_INCREMENT );
+        }
    ProcessClose( FCB );
     }

@@ -272,7 +297,7 @@

/* Check if we're not closed down yet */

-    if( !(FCB->PollState & AFD_EVENT_CLOSE ) ) {
+    if( !CantReadMore(FCB) ) {
    AFD_DbgPrint(MID_TRACE,("Not EOF yet\n"));
    if( FCB->ReceiveIrp.InFlightRequest ) {
        AFD_DbgPrint(MID_TRACE,("We're waiting on a previous
irp\n"));
@@ -288,6 +313,9 @@
    Status = STATUS_END_OF_FILE;

ProcessClose( FCB );
+
+        return UnlockAndMaybeComplete
+            ( FCB, STATUS_SUCCESS, Irp, 0, NULL, FALSE);
     }

if( NT_SUCCESS(Status) ) {