namespace LiChuangService
{
    public static class Crc16
    {
        public static byte[] ComputeChecksum(byte[] crcbuf)
        {
            int crc = 0xffff;
            int len = crcbuf.Length;
            for (int n = 0; n < len; n++)
            {
                byte i;
                crc = crc ^ crcbuf[n];
                for (i = 0; i < 8; i++)
                {
                    int TT;
                    TT = crc & 1;
                    crc = crc >> 1;
                    crc = crc & 0x7fff;
                    if (TT == 1)
                    {
                        crc = crc ^ 0xa001;
                    }
                    crc = crc & 0xffff;
                }
            }
            return new byte[] { (byte)((crc >> 8) & 0xff), (byte)((crc & 0xff)) };
        }
    }
}