#region Copyright
////////////////////////////////////////////////////////////////////////////////
// The following FIT Protocol software provided may be used with FIT protocol
// devices only and remains the copyrighted property of Dynastream Innovations Inc.
// The software is being provided on an "as-is" basis and as an accommodation,
// and therefore all warranties, representations, or guarantees of any kind
// (whether express, implied or statutory) including, without limitation,
// warranties of merchantability, non-infringement, or fitness for a particular
// purpose, are specifically disclaimed.
//
// Copyright 2016 Dynastream Innovations Inc.
////////////////////////////////////////////////////////////////////////////////
// ****WARNING****  This file is auto-generated!  Do NOT edit this file.
// Profile Version = 16.60Release
// Tag = production-akw-16.60.00-0-g5d3d436
////////////////////////////////////////////////////////////////////////////////

#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.IO;

namespace Dynastream.Fit
{
    /// <summary>
    /// Implements Dynastream CRC16 function
    /// </summary>
    public static class CRC
    {
        private static ushort[] crcTable = new ushort[]
        {
            0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
            0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400
        };

        #region Methods
        public static ushort Get16(ushort crc, byte data)
        {
            ushort tmp;

            // compute checksum of lower four bits of byte
            tmp = crcTable[crc & 0xF];
            crc = (ushort)((crc >> 4) & 0x0FFF);
            crc = (ushort)(crc ^ tmp ^ crcTable[data & 0xF]);

            // compute checksum of upper four bits of byte
            tmp = crcTable[crc & 0xF];
            crc = (ushort)((crc >> 4) & 0x0FFF);
            crc = (ushort)(crc ^ tmp ^ crcTable[(data >> 4) & 0xF]);

            return crc;
        }

        public static ushort Calc16(byte[] dataBlock, int size)
        {
            ushort crc = 0;

            for (int i = 0; i < size; i++)
            {
                crc = CRC.Get16(crc, dataBlock[i]);
            }
            return crc;
        }
        #endregion // Methods
    }
} // namespace