com.github.xingshuangs.iot.utils.LRCUtil Maven / Gradle / Ivy
/*
* MIT License
*
* Copyright (c) 2021-2099 Oscura (xingshuang)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.github.xingshuangs.iot.utils;
/**
* LRC tool.
* LRC校验工具
*
* @author xingshuang
*/
public class LRCUtil {
private LRCUtil() {
// NOOP
}
/**
* Get LRC code.
* (获取lrc码)
*
* @param src byte array
* @return byte
*/
public static byte lrc(byte[] src) {
if (src == null || src.length == 0) {
throw new IllegalArgumentException("src");
}
int sum = 0;
for (byte b : src) {
sum += b;
}
sum = sum % 256;
sum = 256 - sum;
return (byte) sum;
}
/**
* Check LRC.
* (lrc校验)
*
* @param src byte array
* @param target target result
* @return true：equality，false：inequality
*/
public static boolean lrc(byte[] src, byte target) {
byte des = lrc(src);
return des == target;
}
}