// --------------------------------------------------------------------------------------------------------------------
// <copyright file="Utilities.cs" company="HandBrake Project (http://handbrake.fr)">
//   This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
//   Defines the Utilities type.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using HandBrake.Interop.Model.Encoding;

namespace HandBrake.Interop
{
	public static class Utilities
	{
		public static int GreatestCommonFactor(int a, int b)
		{
			if (a == 0)
			{
				return b;
			}

			if (b == 0)
			{
				return a;
			}

			if (a > b)
			{
				return GreatestCommonFactor(a % b, b);
			}
			else
			{
				return GreatestCommonFactor(a, b % a);
			}
		}

		/// <summary>
		/// Determines if the given audio encoder is a passthrough encoder choice.
		/// </summary>
		/// <param name="encoder">The audio encoder to examine.</param>
		/// <returns>True if the encoder is passthrough.</returns>
		public static bool IsPassthrough(AudioEncoder encoder)
		{
			return encoder == AudioEncoder.Ac3Passthrough || encoder == AudioEncoder.Passthrough;
		}
	}
}