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  1. import java.nio.charset.StandardCharsets;
  2.  
  3. public class Main {
  4.  
  5.     public static void main(String[] args) {
  6.         int cmdId = 0xF105; // cmdID
  7.         String[] strValues = { ""};
  8.  
  9.         for (String str : strValues) {
  10.             StringBuilder stringBuilder = new StringBuilder();
  11.             byte[] bytes = constructReplyPkt(cmdId, str);
  12.  
  13.             for (byte b : bytes) {
  14.                 String s = Integer.toHexString(b & 0xFF) + " ";
  15.                 if (s.length() < 3) {
  16.                     s = "0" + s;
  17.                 }
  18.                 stringBuilder.append(s);
  19.             }
  20.  
  21.             System.out.println("Packet for str=\"" + str + "\": " + stringBuilder);
  22.         }
  23.     }
  24.  
  25.     protected static byte[] constructReplyPkt(int nCmdId, String sDataContent) {
  26.         if (sDataContent == null) {
  27.             sDataContent = "";
  28.         }
  29.         byte[] baDataContent = sDataContent.getBytes(StandardCharsets.US_ASCII);
  30.         return constructReplyPkt(nCmdId, baDataContent);
  31.     }
  32.  
  33.     protected static byte[] constructReplyPkt(int nCmdId, byte[] baDataContent) {
  34.         return constructReplyPkt(nCmdId, baDataContent, 1, 1);
  35.     }
  36.  
  37.     public static final byte PKT_HEAD_BYTE = (byte) 0x27;
  38.     public static final byte PKT_DIR_PCtoTV = (byte) 0x01;
  39.     public static final byte PKT_TAIL_BYTE = (byte) 0xFB;
  40.  
  41.     protected static byte[] constructReplyPkt(int nCmdId, byte[] baDataContent, int nFrameNo, int nTotalFrameCnt) {
  42.         int nbaDataContentLen = (baDataContent != null) ? baDataContent.length : 0;
  43.         int nPktTotalLen = 9 + nbaDataContentLen;
  44.  
  45.         if (nPktTotalLen > 255) {
  46.             return null; // 若封包長度超過255則返回null
  47.         }
  48.  
  49.         byte[] onePkt = new byte[nPktTotalLen];
  50.         onePkt[0] = PKT_HEAD_BYTE;
  51.         onePkt[1] = PKT_DIR_PCtoTV;
  52.         onePkt[2] = (byte) ((nCmdId & 0xFF00) >> 8);
  53.         onePkt[3] = (byte) (nCmdId & 0x00FF);
  54.         onePkt[4] = (byte) nbaDataContentLen;
  55.  
  56.         if (baDataContent != null) {
  57.             System.arraycopy(baDataContent, 0, onePkt, 5, nbaDataContentLen);
  58.         }
  59.  
  60.         onePkt[5 + nbaDataContentLen] = (byte) nFrameNo;
  61.         onePkt[6 + nbaDataContentLen] = (byte) nTotalFrameCnt;
  62.  
  63.         byte nChksum = 0;
  64.         for (int nByteId = 1; nByteId < onePkt.length - 2; nByteId++) {
  65.             nChksum ^= onePkt[nByteId];
  66.         }
  67.  
  68.         onePkt[7 + nbaDataContentLen] = nChksum;
  69.         onePkt[8 + nbaDataContentLen] = PKT_TAIL_BYTE;
  70.  
  71.         return onePkt;
  72.     }
  73. }
  74.  
Success #stdin #stdout 0.15s 57896KB
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stdin
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Standard input is empty
stdout
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Packet for str="": 27 01 f1 05 00 01 01 f5 fb
https://ideone.com/abdzsf
language:
Java (HotSpot 12)
created:
1 year ago
visibility:
secret

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