2021-09-18 IBMCRC16校验

import java.io.*;
    import java.util.*;
    class MyClass{
        char crc16(int data[],int size){
            char crc = 0x0;
            int i,j;
            int data_t ;
            i = j = 0;
            if(data == null) return 0;
            for(j=0;j<size;j++){
                data_t = data[j];
                crc = (char)((data_t&0xFF) ^ (crc));
                for(i=0;i<8;i++){
                    if((crc&0x1)==1){
                        crc = (char)((crc>>1) ^ (0xa001));
                    }else{
                        crc >>= 1;
                    }
                }
            }
            return (char)((crc>>8)|(crc<<8));
        }
    }
    public class CRC16{
        public static void main(String arg[]){
            int a[]={0x01,0x03,0x11,0xFF};
            char value,i,m;
            int j;
            MyClass crc=new MyClass();
            value = crc.crc16(a,a.length);
            System.out.print("( 二进制 )value=");
            for(i=0;i<16;i++){
                j=((value&(0x8000>>i))!=0)?1:0;
                System.out.print(j);
            }
            System.out.println();
            System.out.print("(十六进制)value=");
            for(i=3;i>=0;i--){
                m=(char)(((value>>(i*4))&(0x000F)));
                if((m>=0)&&(m<=9)){
                    m +='0';
                }else if((m>=10)&&(m<=15)){
                    m=(char)(m-10+'A');
                }
                System.out.print(m);
                if((i%2)==0){
                    System.out.print(" ");
                    if(i==0)break;
                }
            }
        }
    }