--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/commsfwutils/commsbufs/inc/commsbufchain.h	Thu Dec 17 09:22:25 2009 +0200
@@ -0,0 +1,89 @@
+// 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: Chain of shared buffers
+//
+// Description:
+//
+
+#ifndef __COMMSBUFCHAIN_H__
+#define __COMMSBUFCHAIN_H__
+#include <e32base.h>
+
+class TCommsBufAllocator;
+class RCommsBuf;
+
+/*
+Chain of RCommsBufs. 
+@publishedPartner
+**/
+
+class RCommsBufChain
+	{
+
+	friend class TCommsBufIter;
+	friend class RCommsBufQ;
+
+	public:
+	inline RCommsBufChain();
+	inline RCommsBufChain(RCommsBuf* aHeadBuf);
+
+	inline TBool IsEmpty() const;
+	
+	IMPORT_C TInt Length() const;
+	
+
+	IMPORT_C void Assign(RCommsBufChain& aChain);
+	
+	IMPORT_C void Append(RCommsBufChain& aChain);
+	IMPORT_C void Append(RCommsBuf* aBuf);
+	IMPORT_C TInt Append(TInt aLen);
+	
+	IMPORT_C void Prepend(RCommsBufChain& aChain);
+	IMPORT_C void Prepend(RCommsBuf* aBuf);
+	IMPORT_C TInt Prepend(TInt aLen);
+
+	IMPORT_C TInt Alloc(TInt aSize, TCommsBufAllocator& aAccessor);
+	IMPORT_C TInt Alloc(TInt aSize, TInt aMinBufSize, TCommsBufAllocator& aAccessor);
+	IMPORT_C TInt Alloc(TInt aSize, TInt aMinBufSize, TInt aMaxBufSize, TCommsBufAllocator& aAccessor);
+
+	IMPORT_C TInt Split(TInt aOffset, RCommsBufChain& aNewChain);
+
+	IMPORT_C TInt Align(TInt aSize);
+	
+	IMPORT_C void Write(const TDesC8& aDes, TInt aOffset =0);
+	IMPORT_C void Read(TDes8& aDes, TInt aOffset =0) const;
+	
+
+	IMPORT_C void Free(); // Free the chain.
+
+	IMPORT_C void TrimStart(TInt nBytes);
+	IMPORT_C void TrimEnd(TInt anOffset);
+	
+
+	protected:
+	IMPORT_C RCommsBuf* Goto(TInt aDataOffset, TInt& aBufDataOffset, TInt& aBufDataLen, RCommsBuf* &resPrevBuf) const;
+	inline RCommsBuf* Goto(TInt aDataOffset, TInt& aBufDataOffset, TInt& aBufDataLen) const;
+	IMPORT_C RCommsBuf* Last() const;
+
+	private:
+	inline RCommsBuf* First();
+	inline const RCommsBuf* First() const;
+	RCommsBuf* Last();
+	
+
+	protected:
+	RCommsBuf*	iNext;
+	};
+
+#include <comms-infras/commsbufchain.inl>
+#endif // __COMMSBUFCHAIN_H__
+
+