//******************************************************************************************************
//  BlockCounterWrapping.cs - Gbtc
//
//  Copyright © 2020, Grid Protection Alliance.  All Rights Reserved.
//
//  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See
//  the NOTICE file distributed with this work for additional information regarding copyright ownership.
//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may not use this
//  file except in compliance with the License. You may obtain a copy of the License at:
//
//      http://opensource.org/licenses/MIT
//
//  Unless agreed to in writing, the subject software distributed under the License is distributed on an
//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the
//  License for the specific language governing permissions and limitations.
//
//  Code Modification History:
//  ----------------------------------------------------------------------------------------------------
//  05/12/2020 - J. Ritchie Carroll
//       Generated original version of source code.
//
//******************************************************************************************************

#region [ Contributor License Agreements ]

//*******************************************************************************************************
//
//   Code based on the following project:
//        https://github.com/Callisto82/tftp.net
//  
//   Copyright © 2011, Michael Baer
//
//*******************************************************************************************************

#endregion

namespace GSF.Net.TFtp
{
    public enum BlockCounterWrapAround
    {
        ToZero,
        ToOne
    }

    internal static class BlockCounterWrappingHelpers
    {
        private const ushort LastAvailableBlockNumber = 65535;

        public static ushort CalculateNextBlockNumber(this BlockCounterWrapAround wrapping, ushort previousBlockNumber)
        {
            if (previousBlockNumber == LastAvailableBlockNumber)
                return wrapping == BlockCounterWrapAround.ToZero ? (ushort)0 : (ushort)1;

            return (ushort)(previousBlockNumber + 1);
        }
    }
}