--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/realtimenetprots/sipfw/SigComp/SigCompEngine/inc/Crc.h	Tue Feb 02 01:03:15 2010 +0200
@@ -0,0 +1,76 @@
+/*
+* Copyright (c) 2003-2009 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:
+* Name        : Crc.h
+* Part of     : SigComp / misc
+* Interface   : 
+* Implementation of the CRC (PPP Frame Check Sequence)
+* Version     : 1.0
+*
+*/
+
+
+
+
+/**
+ @internalComponent
+*/
+
+
+#ifndef CRC_H
+#define CRC_H
+
+//  INCLUDES
+#include <e32base.h>
+
+
+// CLASS DECLARATION
+
+/**
+*  @brief This class mplements Fast Frame Check computation,
+*         as described in RFC 1662, APPENDIX C.2
+*
+*  @lib sigcomp
+*/
+
+class Crc
+    {
+
+    public:
+
+        enum
+            {
+            /** initial value of crc sum */
+            KFcsInit = 0xffff
+            };
+
+        /**
+         * Calculate crc sum.
+         *
+         * @param aBuffer buffer with input data
+         * @param aLength length of input data
+         * @param aFcs initial value of sum
+         *
+         * @returns crc sum
+         */
+
+        static TUint16 Calc(const TUint8* aBuffer,
+                            TUint aLength,
+                            TUint16 aFcs = KFcsInit);
+
+    };
+
+#endif
+            
+// End of File