Compute Checksum for byte array - CSharp System

CSharp examples for System:Byte Array

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Description

Compute Checksum for byte array

Demo Code


using UnityEngine;
using System.Collections;

public static class arcCRC8
{
   const byte polynomial = 0xA1;
   static readonly byte[] table = new byte[256];
   //ww  w  . jav a 2s . c om
   public static byte ComputeChecksum(byte[] bytes)
   {
      byte crc = 0;
      for (int i = 0; i < bytes.Length; ++i)
      {
         byte index = (byte)(crc ^ bytes[i]);
         crc = (byte)((crc >> 4) ^ table[index]);
      }
      return crc;
   }
   
   static arcCRC8()
   {
      byte value;
      byte temp;
      for (ushort i = 0; i < table.Length; i++)
      {
         value = 0;
         temp = (byte)i;
         for (byte j = 0; j < 4; j++)
         {
            if (((value ^ temp) & 0x01) != 0)
            {
               value = (byte)((value >> 1) ^ polynomial);
            }
            else
            {
               value >>= 1;
            }
            temp >>= 1;
         }
         table[i] = value;
      }
   }
}

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