我不知道Xmodem CRC的初始化

问题描述

	class Program
	{
		public static int calcrc(byte[] ptr)
		{
			int crc = 0;

unchecked{
		    for (int j = 0; j < ptr.Length; j++)
		    {
		    	crc = crc ^ (short)(ptr[j] << 8);
		        for (int i = 0; i < 8; i++)
		        {
		        	if ((crc & 0x8000) != 0)
		            crc = (short)((crc << 1) ^ 0x1021);
		            else
		            crc = (short)(crc << 1);
		        }
		    }
		  }
		    return (crc & 0xFFFF);
		}



		public static void Main(string[] args)
		{
			string a = "123456789";

			byte [] number = new byte[128];

			for (int i=0; i<a.Length; i++)
			{
				number[i]=(byte)a[i];
			}

			Console.Write("\n CRC number: " + calcrc(number));

			Console.Write("Press any key to continue . . . ");
			Console.ReadKey(true);
		}
	}
}

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