/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbheapmemorymanager_p.h"

#include <stdlib.h>

HbMemoryManager* HbHeapMemoryManager::memManager = 0;

/*

* c'tor

*/

HbHeapMemoryManager::HbHeapMemoryManager()

{

}

/*

* To allocate memory

* 

* This function can throw an exception in case of out of memory condition

*/

int HbHeapMemoryManager::alloc(int size)

{

    int offset = -1;

    if( size > 0) {

        void* ptr = ::malloc(size);

        HB_CHECK_PTR(ptr)

        offset = (qptrdiff)ptr;        

    } 

   return offset;

}

/*

* To reallocate memory

* 

* This function can throw an exception in case of out of memory condition

*

*/

int HbHeapMemoryManager::realloc(int oldOffset, int newSize)

{

    int offset = -1;

    if ( newSize > 0 ) {

        if (oldOffset == -1) {

            offset = (qptrdiff)::malloc(newSize);

        } else {

            offset = (qptrdiff)::realloc((void*)oldOffset, newSize);

        }

        HB_CHECK_PTR(offset) 

    }

    return offset;

}

/*

* To free memory

*/

void HbHeapMemoryManager::free(int offset)

{

    if (offset != -1) {

        ::free((void*)offset);

    }

}

/*

* To get instance of memory manager

*/

HbMemoryManager* HbHeapMemoryManager::instance()

{

    if(!memManager) {

        memManager = new HbHeapMemoryManager();

    }

    return memManager;

}

/**

 * To release instance of HbHeapMemoryManager

 */

void HbHeapMemoryManager::releaseInstance()

{

    delete memManager;

    memManager = 0;

}