diff -r 000000000000 -r 79c6a41cd166 menucontentsrv/src/menubuf.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/menucontentsrv/src/menubuf.cpp	Thu Dec 17 08:54:17 2009 +0200
@@ -0,0 +1,132 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+*/
+
+// INCLUDE FILES
+
+#include "menubuf.h"
+#include "menumsg.h"
+#include "mcsmenu.h"
+
+// ================= MEMBER FUNCTIONS =======================
+
+// ---------------------------------------------------------
+// RMenuBuf::Open
+// ---------------------------------------------------------
+//
+TInt RMenuBuf::Open( RMenu& aMenu )
+    {
+	SetBuf( ERead | EWrite, iBuf.iData, iBuf.iData ); // Empty.
+    return CreateSubSession( aMenu, EMenuStreamOpen, TIpcArgs() );
+    }
+
+// ---------------------------------------------------------
+// RMenuBuf::Open
+// ---------------------------------------------------------
+//
+TInt RMenuBuf::Open( RMenu& aMenu, TInt aFunction, TIpcArgs& aArgs )
+    {
+    iBuf.iLen = 0;
+	SetBuf( ERead | EWrite, iBuf.iData, iBuf.iData ); // Initially empty.
+    TPckg<TMenuBuf> buf( iBuf );
+    aArgs.Set( 2, &buf );
+    TInt err = CreateSubSession( aMenu, aFunction, aArgs );
+    if ( !err && iBuf.iLen > 0 )
+        {
+        // If aFunction provided data, it is already here.
+        SetEnd( ERead, iBuf.iData + iBuf.iLen );
+        }
+    return err;
+    }
+
+// ---------------------------------------------------------
+// RMenuBuf::Close()
+// ---------------------------------------------------------
+//
+void RMenuBuf::Close()
+    {
+    // Mind the order: TStreamBuf::Close calls SynchL -> needs an open buf.
+    TStreamBuf::Close();
+    CloseSubSession( EMenuStreamClose );
+    }
+
+// ---------------------------------------------------------
+// RMenuBuf::UnderflowL()
+// ---------------------------------------------------------
+//
+TInt RMenuBuf::UnderflowL( TInt /*aMaxLength*/ )
+    {
+    __ASSERT_DEBUG( Avail( ERead ) == 0, User::Invariant() );
+    TInt len;
+    IpcReadL( len );
+    return len;
+    }
+
+// ---------------------------------------------------------
+// RMenuBuf::OverflowL()
+// ---------------------------------------------------------
+//
+void RMenuBuf::OverflowL()
+    {
+    __ASSERT_DEBUG( Avail( EWrite ) == 0, User::Invariant() );
+    IpcWriteL();
+    }
+
+// ---------------------------------------------------------
+// RMenuBuf::DoSynchL()
+// ---------------------------------------------------------
+//
+void RMenuBuf::DoSynchL()
+    {
+    if ( Lag( ERead ) )
+        {
+        // Read lag unexpected, we do not support seeking.
+        User::Leave( KErrNotSupported );
+        }
+    IpcWriteL();    // Flush write lag.
+	SetBuf( ERead | EWrite, iBuf.iData, iBuf.iData );
+    }
+
+// ---------------------------------------------------------
+// RMenuBuf::IpcReadL()
+// ---------------------------------------------------------
+//
+void RMenuBuf::IpcReadL( TInt& aLength )
+    {
+	TPtr8 ptr( iBuf.iData, KMenuStreamBufSize );
+    User::LeaveIfError( SendReceive( EMenuStreamRead, TIpcArgs( &ptr ) ) );
+    SetBuf( EWrite, iBuf.iData, iBuf.iData );
+    SetBuf( ERead, iBuf.iData, iBuf.iData + ptr.Length() );
+    aLength = ptr.Length();
+    }
+
+// ---------------------------------------------------------
+// RMenuBuf::IpcWriteL()
+// ---------------------------------------------------------
+//
+void RMenuBuf::IpcWriteL()
+    {
+    if ( Lag( EWrite ) )
+        {
+        TPtrC8 ptr( iBuf.iData, Lag( EWrite ) );
+        User::LeaveIfError
+            ( SendReceive( EMenuStreamWrite, TIpcArgs( &ptr ) ) );
+        }
+    SetBuf( ERead, iBuf.iData, iBuf.iData );
+    SetBuf( EWrite, iBuf.iData, iBuf.iData + KMenuStreamBufSize );
+    }
+
+//  End of File