package com.zy.acs.gateway.utils;
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/**
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* CRC16循环冗余校验码
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* Created by vincent on 2023/3/13
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*/
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public class CRCUtils {
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/**
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* 一个字节占 8位
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*/
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private static final int BITS_OF_BYTE = 8;
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/**
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* 多项式
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*/
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private static final int POLYNOMIAL = 0XA001;
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/**
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* CRC寄存器默认初始值
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*/
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private static final int INITIAL_VALUE = 0XFFFF;
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/**
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* CRC16 编码
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* @param bytes 编码内容
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* @return 编码结果
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*/
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public static int crc16(byte[] bytes) {
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int res = INITIAL_VALUE;
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for (byte data : bytes) {
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// 把byte转换成int后再计算
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res = res ^ (data & 0XFF);
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for (int i = 0; i < BITS_OF_BYTE; i++) {
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res = (res & 0X0001) == 1 ? (res >> 1) ^ POLYNOMIAL : res >> 1;
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}
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}
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return res;
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}
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}
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