import java.io.*;
import java.net.*;

class InetServe extends Thread {
   private Socket socket;
   private InputStream in;
   private PrintWriter out;
   private int timesAccessed;

   public InetServe (Socket s, int tA) throws IOException 
   {
      socket = s;
      timesAccessed = tA;
      System.out.println("Serving: "+socket); 
      in = socket.getInputStream();
      out = new PrintWriter( 
         new BufferedWriter(
            new OutputStreamWriter(
               socket.getOutputStream())), true);
      start(); // Start the thread, calls run()
   }
  
   // Convert an array to an integer
   public static final int byteArrayToInt(byte[] b) 
   {
      return (int) ( ((b[0] & 0xFF) << 24) + 
                     ((b[1] & 0xFF) << 16) + 
                     ((b[2] & 0xFF) << 8) + 
                     ( b[3] & 0xFF) ); 
   }
   
   public void run() 
   {
      byte[] b = new byte[1024];   // 1 KB block
      byte[] bInt = new byte[4];   // Integer in bytes
      String fileName;
      int fileNameSize=0;
      int fileSize=0;
      int fileSizeInKB=0;
      int sizeOfLastPart=0;
      try 
      {
         // Get length of filename
         in.read(bInt);
         fileNameSize = byteArrayToInt(bInt);
      
         // Get length of file  
         in.read(bInt);
         fileSizeInKB = byteArrayToInt(bInt);
         in.read(bInt);
         sizeOfLastPart = byteArrayToInt(bInt);
     
         // Read in filename
         in.read(b,0,fileNameSize);
         fileName = new String(b);
         FileOutputStream fOut = new FileOutputStream(fileName);
         System.out.println("File Name: " + fileName);
         System.out.println("File Size: " + 
            (float)(fileSizeInKB*1024 + sizeOfLastPart)/1024 + " kB");

         // Read in the data in 1 kB blocks
         System.out.print( "\nReceiving:  ");
         for(int i = 0; i < fileSizeInKB; i ++)
         { 
            in.read(b);
            fOut.write(b); // Write data to output file

            // Display the current percentage
            System.out.print(i*100/fileSizeInKB + "%");
            System.out.flush();
            if(i*100/fileSizeInKB < 10) 
               System.out.print("\b\b");
            else 
               System.out.print("\b\b\b");
            out.println("Okay");
          }

         // Output the end of the file if needed
         if(sizeOfLastPart > 0)
         {
            byte[] bEnd = new byte[sizeOfLastPart];
            in.read(bEnd);
            fOut.write(bEnd);
         }
         out.println("Okay");
         System.out.println( "100%" );
         fOut.close();
      }catch (Exception e){
         System.out.println("Caught unexpected exception\n");
      } finally {
         try 
         {
            socket.close();
         } catch(IOException e) {
            System.out.println("Caught unexpected exception\n");
         }
      }
   }
}

public class fileTransServer
{  
   static int PORT=0; // assign to next avalible Port.
   public static void main(String[] args) throws IOException 
   {
      if (args.length == 1) 
      {
         PORT=Integer.parseInt(args[0]); // assign to a given Port.
      }
      int timesAccessed = 0;
     
      // Create a Server Socket.    
      ServerSocket s = new ServerSocket(PORT);
      InetAddress  addrs= InetAddress.getLocalHost();         
      System.out.println("Server running on : "+ addrs +
         " ,Port "+s.getLocalPort());
                                                                 
      try 
      {
         while(true)
         {
            Socket socket = s.accept(); // Note: This is a blocking call
            try 
            {
               new InetServe(socket, ++ timesAccessed);  // Handle incoming client
            } catch(IOException e) {
               socket.close();
            }
         }
      } finally {
         s.close();
      }
   } 
}