Class tlv

src/main/java/org/example/tlv.java:6–193

import java.nio.charset.StandardCharsets;

public class tlv {
    // 消息类型定义
    public static final byte TYPE_INFO = 0x01;        // 基础信息请求/响应
    public static final byte TYPE_COMMAND = 0x02;     // 命令执行请求/响应
    public static final byte TYPE_HEARTBEAT = 0x03;   // 存活检测请求/响应
    private static final byte[] MAGIC_PREFIX = new byte[]{
            (byte) 0xCA, (byte) 0xFE, (byte) 0xBA, (byte) 0xBE  // 4字节魔数
    };

    private static final byte[] XOR_KEY = new byte[]{
            (byte) 0xAA, (byte) 0xBB, (byte) 0xCC, (byte) 0xDD  // 自定义异或密钥
    };

    // XOR加密/解密方法
    public static byte[] xorProcess(byte[] data) {
        if (data == null || data.length == 0) {
            return data;
        }
        byte[] result = new byte[data.length];
        for (int i = 0; i < data.length; i++) {
            result[i] = (byte) (data[i] ^ XOR_KEY[i % XOR_KEY.length]);
        }
        return result;
    }

    public static void main(String[] args) {
        byte[] encode = new Request((byte) 0x00, null).encode();
        Request decode = Request.decode(encode);
        System.out.println(decode);

        byte[] encode1 = new Response((byte) 0x00, (byte) 0x01, null).encode();
        Response decode1 = Response.decode(encode1);
        System.out.println(decode1);
    }

    public static boolean validate(byte[] data) {
        if (data.length < MAGIC_PREFIX.length) {
            return false;
        }
        for (int i = 0; i < MAGIC_PREFIX.length; i++) {
            if (data[i] != MAGIC_PREFIX[i]) {
                return false;
            }
        }
        return true;
    }

    // 请求包结构
    public static class Request {
        private byte type;      // 1字节类型
        private int length;     // 4字节长度
        private byte[] data;    // 数据部分

        public Request(byte type, byte[] data) {
            this.type = type;
            this.data = data;
            this.length = data != null ? data.length : 0;
        }