/*

* Copyright (c) 2009 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:

*

*/

//

// tmsmemmap.cpp

//

// Maps a position to mass storage address space

//

/** @file

@internalTechnology

*/

#include <e32def.h>

#include <e32err.h>

#include "tmsmemmap.h"

TMsDataMemMap::TMsDataMemMap()

    Reset();

/**

    Checks that the block is within the limits of the media memory address space

    and truncates the length if block extends beyond media size.

   @param aPos [IN] Position of start address [OUT] Adjusted position to real

   address on media.

   @param aLength [IN] Number of bytes [OUT] Number of bytes truncated in case

   of block overflow.

   @return TInt KErrNone if block fits. KErrArgument if start position is

   greater than the media size. KErrEof if block extends beyond media size.

 */

TInt TMsDataMemMap::TranslateDataPos(TInt64& aPos, TInt& aLength) const

    {

    // Map to the actual position on the media

    aPos += iDataOffset;

    if (aPos > iSize)

        {

        return KErrArgument;

        }

    TInt64 endPos = aPos + aLength;

    if (endPos > iSize)

        {

        aLength = iSize - aPos;

        return KErrEof;

        }

    return KErrNone;

    }

/**

   Checks that the block is within the limits of the media memory address space

   @param aPos [IN] Position of start address [OUT] Adjusted position to real

   address on media.

   @param aLength Number of bytes.

   @return TInt KErrNone if block fits. KErrArgument if start position is

   greater than the media size. KErrEof if block extends beyond media size.

 */

TInt TMsDataMemMap::CheckBlockInRange(TInt64& aPos, TInt aLength) const

    {

    // Map to the actual position on the media

    aPos += iDataOffset;

    if (aPos > iSize)

        {

        return KErrArgument;

        }

    TInt64 endPos = aPos + aLength;

    if (endPos > iSize)

        {

        return KErrEof;

        }

    return KErrNone;

    }