Xamarin / MAUI

using System;

using System.Collections.Generic;

using System.Text;

namespace SICPA_Connexions.Model

{

    public class CRC

    {

        private List<byte> data = new List<byte>();

        public CRC() { }

        public CRC(byte[] din) //trame entrée à la main

        {

            foreach (byte b in din) { data.Add(b); }

        }

        public void putBytes(byte[] din) //ajout trame depuis fonction

        {

            foreach (byte b in din) { data.Add(b); }

        }

        public byte getCRC()

        {

            byte thatCRC = 0, current_byte = 0, count, i;

            for (i = 0; i < data.Count; i++) //calcul du CRC sur toute la trame excepté le CRC lui même et le ETX -> (frame.length-2)

            {

                current_byte = data[i];

                //Console.WriteLine("CRC byte calc : {0:X}", current_byte);

                for (count = 0; count < 8; count++)

                {

                    if (((thatCRC & 0x01) ^ (current_byte & 0x01)) != 0)//=1?

                    {

                        //XOR based to abr200 polygon (X^8 + X^4 + X^3 + X^2 + X^1)

                        thatCRC ^= 0x70;

                        thatCRC >>= 1; //bit shifting on the right

                        thatCRC |= 0x80; //set 1 to msb bit

                    }

                    else

                    {

                        thatCRC >>= 1; //bit shifting on the right again :)

                        thatCRC &= 0x7F; //set 0 to msb bit

                    }

                    //Console.WriteLine("current_crc : {0:X}", thatCRC);

                    //bit shifting on the current byte...

                    current_byte >>= 1;

                }

            }

            //Console.WriteLine(data.Count);

            /*for(i = 0; i < data.Count; i++)

            {

                data.Remove(i);

            }*/

            return thatCRC;

        }

    }

}