// Copyright (c) 2004-2009 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 __INPUTSTREAM_H__

#define __INPUTSTREAM_H__

/** 	@file

	@internalTechnology */

class MInputStream 

	{

public:

	virtual TInt DataAvailable()=0;

	virtual void WaitForData(TInt aDataNeeded, TRequestStatus& aReq)=0;

	virtual void SeekL(TInt aPosition)=0;

	virtual TInt Tell()=0;

	virtual void Read(TDes8& aBuf, TRequestStatus& aReq, TInt32* aCrc=NULL)=0;

	virtual void ReadL(TDes8& aBuf, TInt32* aCrc=NULL)=0;

	virtual void ReadInt32L(TInt32& aNumber, TInt32* aCrc=NULL)=0;

	virtual void ReadUint16L(TUint16& aNumber, TInt32* aCrc=NULL)=0;

	virtual void ReadUint8L(TUint8& aNumber, TInt32* aCrc=NULL)=0;

	virtual void ReadInt32L(TInt32*, TInt aCount, TInt32* aCrc=NULL)=0;

	virtual void ReadUint16L(TUint16*,TInt aCount, TInt32* aCrc=NULL)=0;

	virtual void ReadUint8L(TUint8*, TInt aCount, TInt32* aCrc=NULL)=0;

	// object control

	virtual void Release()=0;

	virtual void AddRef()=0;

	};

/**

	Interface that can be used as a data supplier for MInputStream

	implementation

*/

class MDataFeed

	{

public:

	/**

		Should be used to provide interface client with guarantee that data will stay

		in buffer indefinitely.

	*/

	virtual TInt LockBuffer(TInt aPosition, TPtrC8& aBuffer, TInt aBytesToLock) = 0;

	};

#endif // ndef __INPUTSTREAM_H__