运算的值为：
1 0 0 128 0 0 0 0 0 0 82 0 6 0 163 0 1 1 0 2
正确结果应该为：
183 246而我网上找到的CRC16代码运算结果为（将int转换为byte[]然后取了前两位）：
120 51以下是我在网上找到的CRC16算法代码：private int CrcGetKey(byte[] data)
{
int count = data.Length;
byte[] buf = new byte[data.Length + 2];
data.CopyTo(buf, 0);
int ptr = 0;
int i = 0;
int crc = 0;
byte crc1, crc2, crc3;
crc1 = buf[ptr++];
crc2 = buf[ptr++];
buf[count] = 0;
buf[count + 1] = 0;
while (--count >= 0)
{
crc3 = buf[ptr++];
for (i = 0; i < 8; i++)
{
if (((crc1 & 0x80) >> 7) == 1)//判断crc1高位是否为1
{
crc1 = (byte)(crc1 << 1); //移出高位
if (((crc2 & 0x80) >> 7) == 1)//判断crc2高位是否为1
{
crc1 = (byte)(crc1 | 0x01);//crc1低位由0变1
}
crc2 = (byte)(crc2 << 1);//crc2移出高位
if (((crc3 & 0x80) >> 7) == 1) //判断crc3高位是否为1
{
crc2 = (byte)(crc2 | 0x01); //crc2低位由0变1
}
crc3 = (byte)(crc3 << 1);//crc3移出高位
crc1 = (byte)(crc1 ^ 0x10);
crc2 = (byte)(crc2 ^ 0x21);
}
else
{
crc1 = (byte)(crc1 << 1); //移出高位
if (((crc2 & 0x80) >> 7) == 1)//判断crc2高位是否为1
{
crc1 = (byte)(crc1 | 0x01);//crc1低位由0变1
}
crc2 = (byte)(crc2 << 1);//crc2移出高位
if (((crc3 & 0x80) >> 7) == 1) //判断crc3高位是否为1
{
crc2 = (byte)(crc2 | 0x01); //crc2低位由0变1
}
crc3 = (byte)(crc3 << 1);//crc3移出高位
}
}
}
crc = (int)((crc1 << 8) + crc2);
return crc;
}
1 0 0 128 0 0 0 0 0 0 82 0 6 0 163 0 1 1 0 2
正确结果应该为：
183 246而我网上找到的CRC16代码运算结果为（将int转换为byte[]然后取了前两位）：
120 51以下是我在网上找到的CRC16算法代码：private int CrcGetKey(byte[] data)
{
int count = data.Length;
byte[] buf = new byte[data.Length + 2];
data.CopyTo(buf, 0);
int ptr = 0;
int i = 0;
int crc = 0;
byte crc1, crc2, crc3;
crc1 = buf[ptr++];
crc2 = buf[ptr++];
buf[count] = 0;
buf[count + 1] = 0;
while (--count >= 0)
{
crc3 = buf[ptr++];
for (i = 0; i < 8; i++)
{
if (((crc1 & 0x80) >> 7) == 1)//判断crc1高位是否为1
{
crc1 = (byte)(crc1 << 1); //移出高位
if (((crc2 & 0x80) >> 7) == 1)//判断crc2高位是否为1
{
crc1 = (byte)(crc1 | 0x01);//crc1低位由0变1
}
crc2 = (byte)(crc2 << 1);//crc2移出高位
if (((crc3 & 0x80) >> 7) == 1) //判断crc3高位是否为1
{
crc2 = (byte)(crc2 | 0x01); //crc2低位由0变1
}
crc3 = (byte)(crc3 << 1);//crc3移出高位
crc1 = (byte)(crc1 ^ 0x10);
crc2 = (byte)(crc2 ^ 0x21);
}
else
{
crc1 = (byte)(crc1 << 1); //移出高位
if (((crc2 & 0x80) >> 7) == 1)//判断crc2高位是否为1
{
crc1 = (byte)(crc1 | 0x01);//crc1低位由0变1
}
crc2 = (byte)(crc2 << 1);//crc2移出高位
if (((crc3 & 0x80) >> 7) == 1) //判断crc3高位是否为1
{
crc2 = (byte)(crc2 | 0x01); //crc2低位由0变1
}
crc3 = (byte)(crc3 << 1);//crc3移出高位
}
}
}
crc = (int)((crc1 << 8) + crc2);
return crc;
}
参考：
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;
} }
}