// Copyright (c) 2008-2009 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:

//

/**

 @file

 @InternalTechnology

*/

#ifndef _CMTPTYPECOMPLEXBUFFER_H

#define _CMTPTYPECOMPLEXBUFFER_H

#include <e32base.h>

#include <mtp/mmtptype.h>

/**

Defines the MTP Buffer data type. 

@InternalTechnology

@released 

*/

class CMTPTypeComplexBuffer : public CBase, public MMTPType

    {

public:

    IMPORT_C static CMTPTypeComplexBuffer* NewL();

    IMPORT_C static CMTPTypeComplexBuffer* NewL(const TDesC8& aData);

    IMPORT_C static CMTPTypeComplexBuffer* NewLC();

    IMPORT_C static CMTPTypeComplexBuffer* NewLC(const TDesC8& aData);

	IMPORT_C ~CMTPTypeComplexBuffer();

	IMPORT_C const TDesC8& Buffer();

	IMPORT_C void SetBuffer(const TDesC8& aData );

public: // From MMTPType

    IMPORT_C TInt FirstReadChunk(TPtrC8& aChunk) const;

    IMPORT_C TInt NextReadChunk(TPtrC8& aChunk) const;

    IMPORT_C TInt FirstWriteChunk(TPtr8& aChunk);

    IMPORT_C TInt NextWriteChunk(TPtr8& aChunk);

    IMPORT_C TUint64 Size() const;

    IMPORT_C TUint Type() const;

    IMPORT_C TBool CommitRequired() const;

    IMPORT_C MMTPType* CommitChunkL(TPtr8& aChunk);

private:

    CMTPTypeComplexBuffer();

	void ConstructL(const TDesC8& aData);	

private:

    /**

    The read and write data stream states.

    */

    enum TReadWriteSequenceState

        {

        /**

        Data stream is inactive.

        */

        EIdle,

        /**

        Data stream is in progress.

        */

        EInProgress            

        };

    /**

    The intermediate data buffer. Note that this is declared mutable to allow 

    state updates while processing a read data stream.

    */

	mutable RBuf8   iBuffer;

    /**

    The read data stream state variable. Note that this is declared mutable 

    to allow state updates while processing a read data stream.

    */

	mutable TUint   iReadSequenceState;

    /**

    The write data stream state variable.

    */

	TUint           iWriteSequenceState;

    };

#endif // _CMTPTypeBuffer_H