// Copyright (c) 2004-2009 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:

 // Utility functions for the Mass Storage file system.

 // 

 //

 /**

  @file

  @internalTechnology

 */

 #include <e32std.h>

 #include <e32std_private.h>

 /**

 Returns ETrue if aNum is a power of two

 */

 GLDEF_C TBool IsPowerOfTwo(TInt aNum)

 	{

 	if (aNum==0)

 		return(EFalse);

 	while(aNum)

 		{

 		if (aNum & 0x01)

 			{

 			if (aNum>>1) 

 				return EFalse;

 			break;

 			}

 		aNum>>=1;

 		}

 	return ETrue;

 	}

 /**

 Returns the position of the highest bit in aNum or -1 if aNum == 0

 */

 GLDEF_C TInt Log2(TInt aNum)

 	{

 	TInt res=-1;

 	while(aNum)

 		{

 		res++;

 		aNum>>=1;

 		}

 	return(res);

 	}