// Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "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

@internalComponent

*/

#ifndef NCMBUFFERMANAGER_H

#define NCMBUFFERMANAGER_H

#include <e32base.h>

#include "ncmpktdrvcommon.h"

/**

Responsible for share chunk buffer managerment

*/

NONSHARABLE_CLASS(CNcmBufferManager) : public CBase

    {

public:

    static CNcmBufferManager* NewL();

    ~CNcmBufferManager();

    /**

    * get a free buffer block

    *

    * @param aBuffer to store the buffer block

    * @return KErrNone        if success

    *         KErrCongestion  if there is not enough buffer block, should start flow control

    */

    TInt GetBuffer(TNcmBuffer& aBuffer);

    /**

    * free a buffer block

    *

    * @param aBuffer store the buffer block to free

    */

    void FreeBuffer(const TNcmBuffer& aBuffer);

    void InitBufferArea(TAny* aBuf, TInt aLength);

    /**

    * get a free buffer block

    *

    * @param aSize new ntb size

    * @return KErrNone        if success

    *         KErrUnknown  if too big ntb size, can't create enought buffer block

    */    

    TInt SetBufferCellSize(TInt aSize);

    TBool IsCongestion();

    TInt RequiredBufferCount();	

    inline void SetAlignSize(TInt aSize);	

    inline TInt FreeBufferCount();		

private:

    CNcmBufferManager();

private:

    /**

    * array of free buffer blocks 

    */

    RArray<TNcmBuffer> iFreeQueue;

    /**

    * share chunk LDD buffer area 

    */

    TUint8*            iBuf;

    TInt               iLen;

    TInt               iCellSize;

    TInt               iAlignSize;	

    /**

    * there is enough buffer blocks or not 

    */

    TBool              iIsCongestion;

    };

inline void CNcmBufferManager::SetAlignSize(TInt aSize)

    {

    iAlignSize = aSize;

    }

inline TInt CNcmBufferManager::FreeBufferCount()

    {

    return iFreeQueue.Count();

    }

#endif    //NCMBUFFERMANAGER_H