// 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);

	}