package com.ard.utils.tcp;
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import com.ard.utils.ByteUtils;
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import javax.xml.bind.DatatypeConverter;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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/**
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* @Description: 报文解析
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* @ClassName: MessageParsing
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* @Author: 刘苏义
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* @Date: 2023年07月03日15:30
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* @Version: 1.0
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**/
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public class MessageParsing {
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// 创建缓冲区列表
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private static List<Byte> buffer = new ArrayList<>();
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/**
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* 接收完整包
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*/
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public static byte[] receiveCompletePacket(byte[] receivedData) {
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// 定义包尾字节序列
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byte[] packetEnd = {0x01, 0x02, 0x00};
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// 添加已接收的数据到缓冲区
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for (byte data : receivedData) {
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buffer.add(data);
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}
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// 检查缓冲区中的数据是否包含完整的包
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while (buffer.size() >= packetEnd.length) {
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int endIndex = findPacketEndIndex(buffer, packetEnd);
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if (endIndex != -1) {
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// 找到完整的包
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byte[] packet = extractPacketFromBuffer(buffer, endIndex + packetEnd.length);
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return packet;
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} else {
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// 未找到包尾，继续接收数据
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break;
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}
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}
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// 未找到完整的包
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return null;
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}
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/**
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* crc32校验检查
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* 刘苏义
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* 2023/7/4 11:24
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*/
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public static Boolean CRC32Check(byte[] packet) {
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//System.out.println(DatatypeConverter.printHexBinary(packet));
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int headerLength = 3;//包头3个字节
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int footerLength = 3;//包尾3个字节
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int crcLength = 4;//crc校验4个字节
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//去掉包头包尾
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byte[] payloadCrc32 = ByteUtils.removeHeaderAndFooter(packet, headerLength, footerLength);
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//System.out.println(DatatypeConverter.printHexBinary(payloadCrc32));
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//获取到数据携带的crc32值
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byte[] oldCrc32 = ByteUtils.getLastBytes(payloadCrc32, crcLength);
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//去掉包头包尾crc32字节，仅保留负载
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byte[] payload = ByteUtils.removeHeaderFooterAndCRC(packet, headerLength, footerLength, crcLength);
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// System.out.println(DatatypeConverter.printHexBinary(payload));
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//计算负载的crc32值
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byte[] NewCrc32 = ByteUtils.parseCrc32(payload);
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System.out.println("old:"+DatatypeConverter.printHexBinary(oldCrc32));
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System.out.println("new:"+DatatypeConverter.printHexBinary(NewCrc32));
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//判断数据的crc32校验值和计算值是否相同
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if (Arrays.equals(oldCrc32, NewCrc32)) {
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return true;
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} else {
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return false;
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}
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}
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/**
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* 获取包结束索引
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*/
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public static int findPacketEndIndex(List<Byte> buffer, byte[] packetEnd) {
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for (int i = 0; i <= buffer.size() - packetEnd.length; i++) {
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boolean isMatch = true;
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for (int j = 0; j < packetEnd.length; j++) {
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if (buffer.get(i + j) != packetEnd[j]) {
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isMatch = false;
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break;
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}
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}
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if (isMatch) {
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return i;
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}
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}
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return -1;
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}
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/**
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* 从缓冲区提取数据包
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*/
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public static byte[] extractPacketFromBuffer(List<Byte> buffer, int endIndex) {
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byte[] packet = new byte[endIndex];
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for (int i = 0; i < endIndex; i++) {
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packet[i] = buffer.get(i);
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}
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buffer.subList(0, endIndex).clear();
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return packet;
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}
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/**
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* 去掉包头和包尾校验及转义
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*/
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public static byte[] transferData(byte[] data) {
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int headerLength = 3;//包头3个字节
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int footerLength = 3;//包尾3个字节
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int crcLength = 4;//crc校验4个字节
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data= ByteUtils.removeHeaderFooterAndCRC(data,headerLength,footerLength,crcLength);
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String dataStr = DatatypeConverter.printHexBinary(data);
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if (dataStr.contains("01020201")) {//转义01020201
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dataStr = dataStr.replaceAll("01020201", "010201");
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}
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if (dataStr.contains("01020200")) {//转义01020200
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dataStr = dataStr.replaceAll("01020200", "010200");
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}
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if (dataStr.contains("01020202")) {//转义01020202
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dataStr = dataStr.replaceAll("01020202", "010202");
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}
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data = DatatypeConverter.parseHexBinary(dataStr);
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return data;
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}
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}
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