--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/email/imap4mtm/imaptransporthandler/inc/csocketreader.h	Thu Dec 17 08:44:11 2009 +0200
@@ -0,0 +1,116 @@
+// Copyright (c) 2006-2009 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:
+//
+
+#ifndef __CSOCKETREADER_H__
+#define __CSOCKETREADER_H__
+
+#include <e32base.h>
+
+#include "minputstream.h"
+#include "cimapobservabletimer.h"
+
+// Size of buffer to store received data.
+// The size is chosen to try to minimise the number of reads required for a 
+// large data block on high speed connections.
+const TInt KDefaultBufferSize	= 6144;
+
+// Forward declarations
+class CSocket;
+class MInputStreamObserver;
+class MSocketController;
+
+/**
+The CSocketReader class encapsulates the reading functionality and behaviour
+for a connected socket. It implements the MInputStream API.
+
+@see MInputStream
+@internalTechnology
+@prototype
+*/
+class CSocketReader : public CActive,
+					  public MInputStream,
+					  public MImapTimerObserver
+	{
+private:
+	/** The state machine for the input stream. */
+	enum TInputState
+		{
+		/** The input stream is currently not servicing a request */
+		EIdle = 0,
+		
+		/** The input stream has an observer and it requested a read from the socket. */
+		ERead,
+		
+		/**	The input stream has received a buffer of data from the socket. */
+		EReceivedData,
+		
+		/**	The observer has asked the input stream to close the socket. */
+		EClosing,
+		
+		/**	The socket has been closed - data can no longer be received from it. */
+		EClosed
+		};
+	
+public:
+	static CSocketReader* NewL(CSocket& aSocket, MSocketController& aController);
+	virtual ~CSocketReader();
+
+	void SocketClosed(TInt aError);
+	void Suspend();
+	void Resume();
+
+private:
+	CSocketReader(CSocket& aSocket, MSocketController& aController);
+	void ConstructL();
+	void CompleteSelf();
+
+	// from MInputStream
+	virtual void Bind(MInputStreamObserver& aObserver, TInt aLogId);
+
+	virtual void ReadReq(TInt aIdleTime=0);
+	virtual void CancelReadReq();
+	virtual TBool IsReading();
+	
+	// from CActive
+	virtual void RunL();
+	virtual void DoCancel();
+	virtual TInt RunError(TInt aError);
+	
+	void SetState(TInputState aState);
+	void OnTimerL(const CImapObservableTimer& aSourceTimer);
+	void CloseStreams(TInt aError);
+private:
+	/** The connected socket. */
+	CSocket&					iSocket;
+	/** The socket controller that owns the socket.*/
+	MSocketController&			iController;
+	/** The buffer into which the received data is placed. */
+	TBuf8<KDefaultBufferSize>	iBuffer;
+	/** Whether the data in iBuffer has been delivered to an observer */
+	TBool						iBufferDataDelivered;
+	/**	The state of the input stream. */
+	TInputState					iState;
+	/** Is the socket suspended */
+	TBool						iSuspended;
+	/** The observer for the input stream. */
+	MInputStreamObserver*		iObserver;
+	/** Log file identifier */
+	TInt iLogId;
+	/**Imap Idle Timer. */
+	CImapObservableTimer*		iTimer;
+	TInt						iIdleTime;
+	};
+
+#endif	// __CSOCKETREADER_H__