diff -r 000000000000 -r dfb7c4ff071f datacommsserver/esockserver/inc/es_api_ext.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/datacommsserver/esockserver/inc/es_api_ext.h	Thu Dec 17 09:22:25 2009 +0200
@@ -0,0 +1,147 @@
+// Copyright (c) 1997-2009 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:
+// CS_API_EXT.H
+//
+//
+
+/**
+ @file
+ @internalTechnology
+ @released
+*/
+
+#ifndef CS_API_EXT_H
+#define CS_API_EXT_H
+
+#include <es_sock.h>
+#include <comms-infras/api_ext_list.h>
+#include <comms-infras/trbuf.h>
+
+class TCommsApiExtReqMsg;
+
+_LIT(KApiExtPanic, "ESock_ApiExtItf");
+
+/**
+	API extension interface panic codes
+
+	@internalTechnology
+*/
+enum TApiExtPanic
+	{
+	EApiExtBadHandle = 0,	//< The session/subsession handle of the extension interface is invalid
+	EApiExtMetaOverflow,			//< Storing a message into a descriptor has overflowed
+	};
+
+const TUint KMaxExtApiIpcMsgLength = 256;
+
+class MCommsApiExtProvider
+/**
+Comms API extension provider interface.
+
+@internalTechnology
+*/
+	{
+public:
+	virtual TInt Handle() const = 0;
+	virtual TInt Close(const TIpcArgs& aArgs) const = 0;	
+	virtual TInt Send(const TIpcArgs& aArgs) const = 0;	
+	virtual void SendReceive(const TIpcArgs& aArgs,TRequestStatus& aStatus) const = 0;
+	virtual void Release() = 0;
+	};
+
+class CCommsSessionApiExtProvider : public MCommsApiExtProvider
+	{
+	friend class RCommsApiExtensionBase;
+private:
+	CCommsSessionApiExtProvider(RCommsSession& session);
+	static CCommsSessionApiExtProvider *Open(RCommsSession& aExtensionProvider, TSupportedCommsApiExt aInterfaceId, TInt &error);
+	TInt Close(const TIpcArgs& aArgs) const;	
+	TInt Handle() const;
+	TInt Send(const TIpcArgs& aArgs) const;	
+	void SendReceive(const TIpcArgs& aArgs,TRequestStatus& aStatus) const;
+	void Release();
+
+private:
+	const RCommsSession iSession;
+	};
+	
+class CCommsSubSessionApiExtProvider : public MCommsApiExtProvider
+	{
+	friend class RCommsApiExtensionBase;
+private:
+	CCommsSubSessionApiExtProvider(RCommsSubSession& subSession);
+	static CCommsSubSessionApiExtProvider *Open(RCommsSubSession& aExtensionProvider, TSupportedCommsApiExt aInterfaceId, TInt &error);
+	TInt Close(const TIpcArgs& aArgs) const;	
+	TInt Handle() const;
+	TInt Send(const TIpcArgs& aArgs) const;	
+	void SendReceive(const TIpcArgs& aArgs,TRequestStatus& aStatus) const;
+	void Release();
+
+private:
+	const RCommsSubSession iSubSession;
+	};
+	
+	
+class RCommsApiExtensionBase
+/**
+Base class for Comms API extensions.
+
+@internalTechnology
+@released
+*/
+	{
+protected:
+	IMPORT_C explicit RCommsApiExtensionBase();
+	IMPORT_C TInt Open(RCommsSession& aExtensionProvider, TSupportedCommsApiExt aInterfaceId);
+	IMPORT_C TInt Open(RCommsSubSession& aExtensionProvider, TSupportedCommsApiExt aInterfaceId);
+	IMPORT_C void Close();
+	IMPORT_C void SendRequest(TCommsApiExtReqMsg& aRequestMsg, TDes8& aResponseBuf, TRequestStatus& aStatus);
+	IMPORT_C void SendMessage(TCommsApiExtReqMsg& aRequestMsg);
+
+protected:
+	MCommsApiExtProvider *iProvider;
+	TSupportedCommsApiExt iInterfaceId;
+
+private:
+	RPointerArray<Elements::TRBuf8> iBuffers;
+	};
+
+template<TSupportedCommsApiExt T>
+class RCommsApiExtension : public RCommsApiExtensionBase
+/**
+Comms API extensions template. New extension APIs may derive from this template.
+
+@internalTechnology
+@released
+*/
+	{
+public:
+	inline TInt Open(RCommsSession& aExtensionProvider);
+	inline TInt Open(RCommsSubSession& aExtensionProvider);
+	};
+
+template<TSupportedCommsApiExt T>
+TInt RCommsApiExtension<T>::Open(RCommsSession& aExtensionProvider)
+	{
+	return RCommsApiExtensionBase::Open(aExtensionProvider,T);
+	}
+
+template<TSupportedCommsApiExt T>
+TInt RCommsApiExtension<T>::Open(RCommsSubSession& aExtensionProvider)
+	{
+	return RCommsApiExtensionBase::Open(aExtensionProvider,T);
+	}
+
+#endif // CS_API_EXT_H
+