This is chatting program using etherframe packet.
I finished crc, gui , making packet and sending packet.
but I can't implement stop and wait timeout resend...
I can't implement it.. can anybody help me?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.io.*;
import java.net.*;
public class ChatJin implements Runnable, ActionListener {
private JFrame f;
private JScrollPane jsp,jrp,jmp;
private JTextArea jta,s,r,m;
private JTextField jtf;
private DefaultComboBoxModel model, model2;
private JTextField Smodel,Smodel2;
private JComboBox jcb, jcb2, Sjcb, Sjcb2;
private JScrollBar jb;
private DatagramSocket server, client, resend;
private DatagramPacket sinData, soutData;
private byte[] data = new byte[500];
private InetAddress myInet;
private int count=0;
private int dport=0;
public static void main(String args[]) {
ChatJin m = new ChatJin();
m.go();
Thread t = new Thread(m);
t.start();
}
public ChatJin() {
//Find Local IP Address & Name
try {
InetAddress myInet=InetAddress.getLocalHost();
System.out.println("My InetAddress "+myInet.getHostAddress()+" name "+myInet.getHostName());
} catch(UnknownHostException e) {
System.out.println("InetAddress Error on Port "+8000+" Error code "+e);
e.printStackTrace();
}
try {
//Listening
server = new DatagramSocket(8000,InetAddress.getLocalHost());
System.out.println("Datagram Server on "+server.getLocalAddress().getHostAddress()+" port "+server.getLocalPort());
} catch(UnknownHostException e) {
System.out.println("Server Unknown Exception error"+e);
} catch(SocketException e) {
System.out.println("Server Socket Error on Port "+dport+" Error code "+e);
e.printStackTrace();
}
try {
//Sending
client = new DatagramSocket(dport,InetAddress.getLocalHost());
System.out.println("Datagram Client on "+client.getLocalAddress().getHostAddress()+" port "+client.getLocalPort());
} catch(IOException e) {
System.out.println("Client Socket Error on Port "+dport+" Error code "+e);
e.printStackTrace();
}
}
public DatagramPacket EtherFrame(String infor) { InetAddress inet = null;
byte[] outdata=new byte[1024];
byte[] da=new byte[6];
byte buf[] = new byte[1024];
byte[] sa=new byte[6];
byte[] llc=new byte[4];
//da[0]=0x0f;
System.arraycopy(da,0,outdata,0,6);
/* for(int i = 0; i < 6; i++)
da[i] = outdata[i];
for (int i = 0; i < da.length; i++)
System.out.format("%02X%s", da[i], (i < da.length - 1) ? "-" : "");
*/ /////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////// Get mac
try {
InetAddress myInet = InetAddress.getLocalHost();
/*
* Get NetworkInterface for the current host and then read the
* hardware address.
*/
NetworkInterface ni = NetworkInterface.getByInetAddress(myInet);
byte[] mac = ni.getHardwareAddress();
/*
* Extract each array of mac address and convert it to hexa with the
* following format 08-00-27-DC-4A-9E.
*/
System.out.print("Source address :" );
for (int i = 0; i < mac.length; i++) {
sa[5-i]=mac[i];
// da[i]=sa[i];
System.out.format("%02X%s", sa[5-i], (i < sa.length - 1) ? "-" : "");
// System.out.print(sa[i]);
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e) {
e.printStackTrace();
}
System.arraycopy(sa,0,outdata,6,6);
byte[] ty=new byte[2];
//////////////////////////////////////////////////////////////////////////////////////////////
ty[0] = outdata[12];
ty[1] = outdata[13];
// ty[0]=(byte)(160 & 0x000000ff); ty[1]=(byte)(2 & 0x000000ff);
// System.out.format("%02X", ty[0],ty[1] );
System.arraycopy(ty,0,outdata,12,2);
////////////////////////////////////////////////////////////////////////////////////////
// llc[0]=0x43; //LLC
for(int i = 14; i < 18; i++)
llc[i - 14] = outdata[i];
System.arraycopy(llc,0,outdata,14,4);
////////////////////////////////////////////////////////////////////////////////////////////////
String ip = (String) Smodel.getText(); //.getText()
// ip=(String) Smodel.getSelectedText();
if(ip.equals(""))
{ // catch(NullPointerException ex)
System.out.println("\nServer IP not setting");
try {
ip=InetAddress.getLocalHost().getHostAddress();
} catch(UnknownHostException ee) {
ee.printStackTrace();
}
}
System.out.println("Server IP string"+ip+".");
addElement(ip.trim()); // set Server IP
String up =(String) jcb.getSelectedItem();
if(up!=null) {
if(up=="\n")
System.out.println("destination IP setting"+up+"."); // addElement((String) up.trim());
else System.out.println("what string"+up+".");
}
String dportstring = (String) Smodel2.getText();
if(dportstring.equals(""))
dportstring = (String) "8000"; //default port number
//System.out.println(dportstring);
dport = (int) Integer.parseInt(dportstring); //string output -> convert string to int ?
int len=infor.getBytes().length;
System.arraycopy(infor.getBytes(),0,outdata,18,len);
String outdatanew = new String(outdata,0,len+18);
int[] table = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};
byte[] bytes = outdatanew.getBytes();
int crc = 0xffffffff;
for (byte b : bytes) {
crc = (crc >>> 8) ^ table[(crc ^ b) & 0xff];
}
// flip bits
crc = ~crc;
System.out.println("CRC32 (via direct calculation) = " + Integer.toHexString(crc));
byte[] crc32 = new byte[4]; //byte
crc32[3] = (byte)(crc & 0xff);
crc32[2] = (byte)((crc >> 8) & 0xff);
crc32[1] = (byte)((crc >> 16) & 0xff);
crc32[0] = (byte)((crc >> 24) & 0xff);
System.out.println("CRC32 = " +crc32[3]+crc32[2]+crc32[1]+crc32[0]);
System.arraycopy(crc32,0,outdata,18+len,4);
System.arraycopy(outdata,0,buf,0,18+4+len); //will use as resend packet///////////////////////////////////////////////////////
try {
inet = InetAddress.getByName(ip);
} catch(Exception ex) {
ex.printStackTrace();
}
return(new DatagramPacket(outdata,len+18+4,inet,dport));
}
public void go() {
try {
f = new JFrame(InetAddress.getLocalHost().getHostAddress()); //WIndow Frame
} catch(UnknownHostException e) {
e.printStackTrace();
}
f.addWindowListener(new WindowAdapter() { //Window icons:
public void windowClosing(WindowEvent e) {
if(client.isClosed()!=true) client.close(); //if we call Socket.close socket then exception occurs if(server.isClosed()!=true) server.close();
System.exit(0);
}
});
/* Graphic
* +--------------------------------------------+
* | Server IP [ ] port [ ] |
* +--------------------------------------------+ jp (Sjp+jp2)
* | Destination [ ] broadcast v |
* +--------------------------------------------+
* | echo | Rx | Monitoring |mp
* | box | box | box |
* +--------------------------------------------+
* | chatting box |jps
* | |
* +--------------------------------------------+
* *
*/
Container c = f.getContentPane(); //
EtchedBorder eb = new EtchedBorder(); //각 판넬의 겉 모양은 EtchedBoard로 구성 할 예정
JPanel mp = new JPanel(); // 송신, 수신, 모니터링 판넬 (s+r+m)로 구성"Message Sent Received Monitoring"
mp.setLayout(new GridLayout(1,3));
s = new JTextArea(); //"Sent"전체 프레임의 중간에 있는 수신 메시지를 표시하는 프레임
s.setEditable(false); //메시지를 보여주는 곳으로 쓸 수 없음
jsp = new JScrollPane(s);
r = new JTextArea(); //"Received"전체 프레임의 중간에 있는 수신 메시지를 표시하는 프레임
r.setEditable(false); //메시지를 보여주는 곳으로 쓸 수 없음
jrp = new JScrollPane(r);
m = new JTextArea(); //"Monitered"전체 프레임의 중간에 있는 수신 메시지를 표시하는 프레임
m.setEditable(false); //메시지를 보여주는 곳으로 쓸 수 없음
jmp = new JScrollPane(m);
mp.add(jsp,"Left"); mp.add(jrp,"Center"); mp.add(jmp,"Right");
mp.setBorder(eb);
JPanel jp2 = new JPanel(); // 윈도우 기본 틀내에 존재하는 상위 North 판넬
jp2.setLayout(new GridLayout(1,4)); //첫번째 프레임네 서브 프레임으로 사용 (I+jcb)로 구성
JLabel l = new JLabel("Destination");
model = new DefaultComboBoxModel();
jcb = new JComboBox(model);
jcb.setEditable(true);
JCheckBox checkButton = new JCheckBox("ARP"); //나중에 global 변수로 지정해서 다른 곳에서 활용가능하도록 함
jp2.add(l,"West"); jp2.add(jcb,"Center"); jp2.add(checkButton,"East");
jp2.setBorder(eb); // 프레임 주변의 음양으로 가는 줄을 표시
JPanel Sjp = new JPanel(); // 윈도우 기본 틀내에 존재하는 상위 North 판넬
Sjp.setLayout(new GridLayout(1,4)); //첫번째 프레임네 서브 프레임으로 사용 (I+jcb)로 구성
JLabel S = new JLabel("Server IP");
Smodel = new JTextField(16);
// Sjcb = new JComboBox(Smodel);
// Sjcb.setEditable(true);
JLabel S2 = new JLabel(" UDP port");
Smodel2 = new JTextField(4);
// Sjcb2 = new JComboBox(Smodel2);
// Sjcb2.setEditable(true);
Sjp.add(S); Sjp.add(Smodel); Sjp.add(S2); Sjp.add(Smodel2);
Sjp.setBorder(eb); // 프레임 주변의 음양으로 가는 줄을 표시
JPanel jps = new JPanel(); // 전체 판넬 하단의 판넬 (Im+jtf)로 구성
jps.setLayout(new BorderLayout());
JLabel lm = new JLabel("Message"); //jsp 판넬 내의 글씨쓰는 옆에 존재하는 글씨창 이름
jtf = new JTextField(); //jsp 판넬 중 글씨를 넣는 부분
jps.add(lm,"West"); jps.add(jtf,"Center");
jps.setBorder(eb); // 프레임 주변의 음양으로 가는 줄을 표시
JPanel jp = new JPanel(); //Server IP window와 Destination window를 합한 묶음, 자바에서는 여러개의 창을 만들때 묶음을 만들어 분할해야 한다,
jp.setLayout(new GridLayout(2,1)); //두개의 가로줄로 수성
jp.add(Sjp);
jp.add(jp2);
c.add(mp);
c.add(jp,"North");
c.add(jps,"South");
jtf.addActionListener(this); //waiting for keyboard input
f.setSize(300,200);
f.setVisible(true);
}
//TextField의 내용을 packet에 저장 하여 보내는 구현...
public void actionPerformed(ActionEvent e) { //Key board input에 의한 message 작성
String mssg = jtf.getText();
int acksequenceser=0; int acksequencecli=1;
s.append(">> " + mssg+"\n");
m.append(count++ +">> " + mssg+"\n");
soutData = null;
try {
// inet = InetAddress.getByName(ip);
soutData = EtherFrame(mssg);
client.send(soutData);
System.out.println("Send IP= "+soutData.getAddress()+", port= " +soutData.getPort());
} catch(Exception ex) {
ex.printStackTrace();
}
jtf.setText("");
}
synchronized public void addElement(String ip) {
System.out.println(ip);
for(int i=0;i<model.getSize();i++) {
if(model.getElementAt(i).equals(ip)) {
// model.setSelectedItem(ip);
if(jb==null) jb = jsp.getVerticalScrollBar();
jb.setValue(jb.getMaximum());
return;
}
}
model.addElement(ip);
if(jb==null) jb = jsp.getVerticalScrollBar();
jb.setValue(jb.getMaximum());
}
//UDP packet을 Listen하는 Thread
public void run() {
byte[] rmsg = new byte[1024];
byte[] rsvmsg = new byte[1024];
byte[] da=new byte[6];
byte[] sa=new byte[6];
byte[] ty=new byte[2];
byte[] llc=new byte[4];
byte[] crc=new byte[4];
int crc32;
/////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////
while(true) {
sinData = new DatagramPacket(data,data.length);
System.out.println("Listening...");
try {
server.receive(sinData);
} catch(IOException e) {
System.out.println("Packet received I/O Error..."+", "+e);
e.printStackTrace();
}
System.out.println("Packet received from..."+sinData.getAddress().getHostName()+", "+sinData.getPort());
String addr = sinData.getAddress().getHostName();
int pt =sinData.getPort();
int len = sinData.getLength();
rmsg=sinData.getData();
System.arraycopy(rmsg,12,ty,0,2);
System.arraycopy(rmsg,18,rsvmsg,0,len-18-4);
String rsvData = new String(rsvmsg,0,len-18-4);
System.arraycopy(rmsg,len-4,crc,0,4);
String rsvDatanew = new String(rmsg,0,len-4);
//int로변환
crc32 = (int)crc[3] & 0xff;
crc32 += ((int)crc[2] << 8) & 0xff00;
crc32 += ((int)crc[1] << 16) & 0xff0000;
crc32 += ((int)crc[0] << 24) & 0xff000000;
byte[] bytes = rsvDatanew.getBytes();
int[] table = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};
//CRC32: 2bdd08e6 (OK)
byte[] bytes2 = rsvDatanew.getBytes();
int crc2 = 0xffffffff;
for (byte b : bytes2) {
crc2 = (crc2 >>> 8) ^ table[(crc2 ^ b) & 0xff];
}
// flip bits
crc2 = crc2 ^ 0xffffffff;
System.out.println("CRC32 (via direct calculation) = " + Integer.toHexString(crc2));
System.out.println("Rsv Packet ="+rsvData);
System.out.println("hostname = "+addr+" port= "+pt+" Data Type = 0x"+ty[1]+ty[0]);
boolean a=(crc2==crc32);
if(a){
r.append("[ " + addr + " ] " + rsvData + "\n");
m.append(count++ +"[ " + addr + " ] " + rsvData + "\nCRC\n(receive) :"+Integer.toHexString(crc2)+"\n(send):"+Integer.toHexString(crc32));
}
else{
r.append(" ");
m.append(count++ +"[ " + addr + " ] " + rsvData + "\nCRC Error!\n\n");
}
addElement(addr);
}
}
}