package com.ruoyi.fuzhou.utils.hj1239;

import java.nio.charset.StandardCharsets;

/**
 * 数据封装
 */
public class ProtocolDataEncoder {
    public static final byte START_FLAG = 0x01;
    public static final byte END_FLAG = 0x02;

    public static byte[] encodeData(String data) {
        byte[] dataBytes = data.getBytes(StandardCharsets.UTF_8);
        byte checksum = calculateChecksum(dataBytes);
        byte[] frame = new byte[2 + dataBytes.length + 1];
        frame[0] = START_FLAG;
        System.arraycopy(dataBytes, 0, frame, 1, dataBytes.length);
        frame[frame.length - 2] = checksum;
        frame[frame.length - 1] = END_FLAG;
        return frame;
    }

    public static byte calculateChecksum(byte[] data) {
        byte sum = 0;
        for (byte b : data) {
            sum += b;
        }
        return sum;
    }
}