diff -r 000000000000 -r bde4ae8d615e os/kernelhwsrv/userlibandfileserver/fileserver/shostmassstorage/server/protocol/include/mblocktransferprotocol.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/kernelhwsrv/userlibandfileserver/fileserver/shostmassstorage/server/protocol/include/mblocktransferprotocol.h	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,55 @@
+// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "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:
+// BOT Protocol layer for USB Mass Storage Class
+// 
+//
+
+/**
+ @file
+ @internalTechnology
+*/
+
+#ifndef MBLOCKTRANSFERPROTOCOL_H
+#define MBLOCKTRANSFERPROTOCOL_H
+
+/**
+Interface class to be provided by the Protocol layer. The interface methods are
+used by TBlockTransfer class which manages block read and block writes of the
+data to be transferred.
+*/
+class MBlockTransferProtocol
+    {
+public:
+    /**
+    Read a block of data aligned to block boundary.
+
+    @param aPos The position aligned to block boundary
+    @param aBuf The buffer to copy the data into
+    @param aLength The Length in bytes, a multiple of the block length
+    */
+    virtual void BlockReadL(TUint64 aPos, TDes8& aBuf, TInt aLength) = 0;
+
+    /**
+    Write a block of data aligned to block boundary.
+
+    @param aPos The position aligned to block boundary
+    @param aBuf The buffer containing the data to write
+    @param aOffset The offset into the buffer to the start of the block
+    @param aLength The length in bytes, must be a multiple of the block length
+    */
+    virtual void BlockWriteL(TUint64 aPos, TDesC8& aBuf, TUint aOffset, TInt aLength) = 0;
+    };
+
+#endif // MBLOCKTRANSFERPROTOCOL_H
+