/* This file is part of the db4o object database http://www.db4o.com

Copyright (C) 2004 - 2010  Versant Corporation http://www.versant.com

db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see http://www.gnu.org/licenses/. */
using System;

namespace Db4oUnit.Extensions.Util
{
	/// <exclude></exclude>
	public class Binary
	{
		public static long LongForBits(long bits)
		{
			return (long)((Math.Pow(2, bits)) - 1);
		}

		public static int NumberOfBits(long l)
		{
			if (l < 0)
			{
				throw new ArgumentException();
			}
			long bit = 1;
			int counter = 0;
			for (int i = 0; i < 64; i++)
			{
				if ((l & bit) == 0)
				{
					counter++;
				}
				else
				{
					counter = 0;
				}
				bit = bit << 1;
			}
			return 64 - counter;
		}
	}
}
