/*

 * 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"

 #include "debug.h"

 TMsDataMemMap::TMsDataMemMap()

 	{

 	__MSFNSLOG

     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

     {

 	__MSFNSLOG

     // 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

     {

 	__MSFNSLOG

     // Map to the actual position on the media

     aPos += iDataOffset;

     if (aPos > iSize)

         {

         return KErrArgument;

         }

     TInt64 endPos = aPos + aLength;

     if (endPos > iSize)

         {

         __PXYPRINT2(_L("EOF found 0x%lx x%x"), aPos, aLength);

         return KErrEof;

         }

     return KErrNone;

     }