package com.ruoyi.fuzhou.utils.oilmodbus;
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/**
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* crc校验
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*/
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public class Crc16Utils {
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/**
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* 十六进制的字符串转换为byte数组
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*
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* @param hex16Str 十六进制字符串
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* @return byte数组
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*/
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public static byte[] conver16HexToByte(String hex16Str) {
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char[] c = hex16Str.toCharArray();
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byte[] b = new byte[c.length / 2];
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for (int i = 0; i < b.length; i++) {
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int pos = i * 2;
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b[i] = (byte) ("0123456789ABCDEF".indexOf(c[pos]) << 4 | "0123456789ABCDEF"
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.indexOf(c[pos + 1]));
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}
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return b;
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}
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/**
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* 字节数组转16进制
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*
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* @param bytes 需要转换的byte数组
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* @return 转换后的Hex字符串
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*/
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public static String bytesToHex(byte[] bytes) {
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < bytes.length; i++) {
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String hex = Integer.toHexString(bytes[i] & 0xFF);
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if (hex.length() < 2) {
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sb.append(0);
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}
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sb.append(hex);
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}
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return sb.toString().toUpperCase();
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}
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/**
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* CRC校验码
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*
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* @param hex16Str 十六进制字符串
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* @param format 是否需要高低位互换，佳岚的需要高低位互换
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* @return CRC校验码
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*/
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public static String makeCRC(String hex16Str, boolean format) {
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byte[] bytes = conver16HexToByte(hex16Str);
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int crc = 0x0000ffff;
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for (int i = 0; i < bytes.length; i++) {
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crc ^= ((int) bytes[i] & 0x000000ff);
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for (int j = 0; j < 8; j++) {
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if ((crc & 0x00000001) != 0) {
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crc >>= 1;
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crc ^= 0x0000a001;
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} else {
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crc >>= 1;
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}
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}
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}
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// 高低位互换，输出符合相关工具对Modbus CRC16的运算
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if (format) {
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crc = ((crc & 0xff00) >> 8) | ((crc & 0x00ff) << 8);
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}
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return String.format("%04X", crc);
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}
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}
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