crc16位算法 java 与 c# 版本

前段时间做一个考勤系统，用到一个crc16的算法，于是上网搜索，很多资料，奈何版本各不相同，都不能满足现有的需求，于是还是看合作方实现的c#代码：整理如下：
C#代码:
using System;
using System.Collections.Generic;
using System.Text;

 


     class Program
    {
       
    public static class CRC16
    {
        // Methods
        public static ushort GetCRC16(byte[] inf)
        {
            CRC16_Table table = new CRC16_Table();
            ushort num = 0;
            for (int i = 0; i < inf.Length; i++)
            {
                int ind = (num & 0xff) ^ inf[i];
                num = (ushort)((num >> ^ table[ind]);
                          }
            return num;
        }

        public static byte GetLastCRC(byte[] order)
        {
            return order[order.Length - 1];
        }

        public static byte GetLastCRC(ushort crc16)
        {
            string str = Convert.ToString((int)crc16, 2);
            int length = str.Length - 8;
            string str2 = "00000000";
            string str3 = (length <= 0) ? str2 : str.Substring(0, length);
            string str4 = (length <= 0) ? str : str.Substring(length,;
         
            byte num2 = Convert.ToByte(str3, 2);
            byte num3 = Convert.ToByte(str4, 2);
                       return (byte)(num2 ^ num3);
        }

        public static byte[] GetOrder(byte[] inf)
        {
            byte lastCRC = GetLastCRC(GetCRC16(inf));
            List<byte> list = new List<byte>();
            list.AddRange(inf);
            list.Add(lastCRC);
        
            return list.ToArray();
        }



          }


    internal class CRC16_Table : List<ushort>
    {
        // Methods
        public CRC16_Table()
        {
            base.AddRange(this.crc_table());
        }

        private ushort[] crc_table()
        {
            return new ushort[] {
            0, 0xc0c1, 0xc181, 320, 0xc301, 960, 640, 0xc241, 0xc601, 0x6c0, 0x780, 0xc741, 0x500, 0xc5c1, 0xc481, 0x440,
            0xcc01, 0xcc0, 0xd80, 0xcd41, 0xf00, 0xcfc1, 0xce81, 0xe40, 0xa00, 0xcac1, 0xcb81, 0xb40, 0xc901, 0x9c0, 0x880, 0xc841,
            0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40, 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
            0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641, 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
            0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240, 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441,
            0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41, 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
            0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41, 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
            0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640, 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
            0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240, 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
            0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41, 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
            0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41, 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
            0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640, 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
            0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241, 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
            0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40, 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
            0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40, 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
            0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641, 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040
         };
        }
    }



都说c#与java很相似，于是java版本的crc16位算法诞生,
java代码:
import java.util.ArrayList;
import java.util.List;


public class CRC16 {
static char[] table ={
0x0000, 0xc0c1, 0xc181, 0x140, 0xc301, 0x3c0, 0x280, 0xc241, 0xc601, 0x6c0, 0x780, 0xc741, 0x500, 0xc5c1,  0xc481, 0x440,
0xcc01, 0xcc0, 0xd80, 0xcd41, 0xf00, 0xcfc1, 0xce81, 0xe40, 0xa00, 0xcac1, 0xcb81, 0xb40, 0xc901, 0x9c0, 0x880, 0xc841,
0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40, 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641, 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240, 0x3600, 0xf6c1, 0xf781, 0x3740,0xf501, 0x35c0,0x3480, 0xf441,
0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41, 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41, 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640, 0x2200, 0xe2c1,0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240, 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41, 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41, 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640, 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241, 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40, 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
  0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40, 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641, 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040
         };
  public static int GetCRC16(byte[] inf)
    {
 
         int num = 0;
        for (int i = 0; i < inf.length; i++)
        {
         int td=inf[i];
         if(td<0){
        td+=256;
         }
        int ind = (int)(num & 0xff) ^ td;
        char ti= table[ind];
            num = (int) (((num >>) ^ ti);
           
        }
       
        return  num;
    }

public static byte[] GetInfo(byte[] order)
    {
   
        List<Byte> list = new ArrayList<Byte>();
        for (int i = 0; i < (order.length - 1); i++)
        {
            list.add(order[i]);
        }
        byte[] dest=new byte[order.length-1];
        System.arraycopy(order, 0, dest, 0, dest.length);
        return dest;
    }

    public static byte GetLastCRC(byte[] order)
    {
        return order[order.length - 1];
    }
   
    public static int GetLastCRC(int crc16)
    {

        String str = Integer.toBinaryString( crc16)  ;
        int length = str.length() - 8;
        String str2 = "00000000";
        String str3 = (length <= 0) ? str2 : str.substring(0, length);
     
        String str4 = (length <= 0) ? str : str.substring(length, str.length());
     
        int num2 =Integer.parseInt(str3,2);       
        int num3 = Integer.parseInt(str4,2);

        return (num2 ^ num3);
    }
   

    public static byte[] getOrder(byte[] inf)
    {
        int lastCRC =  GetLastCRC(GetCRC16(inf));
        byte[] dest=new byte[inf.length+1];
        System.arraycopy(inf, 0, dest, 0, inf.length);
        dest[inf.length]=(byte)lastCRC;
        return dest;
    }



        }
}

评论

2 楼 minn84 2013-04-04  

yaoneng 写道

iteye里面有 代码编辑器的，然后你发布出来的代码就不用这么难看了

多谢你这位大 的提醒，不过我当时确实是用代码编辑器，可能用得不纯熟，出现这种情况，不过你的这个提醒令我想起网上流行的一张图片，大意是：系统再怎么烂，代码一定要写得好看.....  

1 楼 yaoneng 2013-04-03  

iteye里面有 代码编辑器的，然后你发布出来的代码就不用这么难看了