Исходный текст программы GetChecksum.java

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// ==========================================
// GetChecksum.java
// (C) Alexandr Frolov, 1998
// E-mail: frolov@glasnet.ru
// Web:    http://www.glasnet.ru/~frolov 
// ==========================================

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.zip.*;

public class GetChecksum
{
  public static void main(String args[])
  {
    FrameWindow frame;
    frame =  new FrameWindow(
      "File Checksum calculation");
    frame.setVisible(true);
  }
}

// =======================================
// Class FrameWindow
// =======================================
class FrameWindow extends Frame
  implements ActionListener, WindowListener
{
  TextArea ta;
  
  MenuBar mb;
  
  Menu mFile;
  MenuItem miOpen;
  MenuItem miExit;
  
  FileDialog fdlg;
  
  // ============================================
  // FrameWindow
  // ============================================
  public FrameWindow(String szTitle)
  {
    super(szTitle);
    setSize(400, 300);
    
    mb = new MenuBar();
    mFile = new Menu("File");
    
    miOpen = new MenuItem("Open...");
    mFile.add(miOpen);
    
    mFile.add("-");
    
    miExit = new MenuItem("Exit");
    mFile.add(miExit);
    
    mb.add(mFile);
    
    miOpen.addActionListener(this);
    miExit.addActionListener(this);
    
    setMenuBar(mb);
    
    this.addWindowListener(this);
    
    ta = new TextArea(10, 30);

    setLayout(new BorderLayout());
    add("Center", ta);
  }

  // ============================================
  // actionPerformed
  // ============================================
  public void actionPerformed(ActionEvent e)
  {
    if(e.getSource().equals(miOpen))
    {
      fdlg = new FileDialog(this, "Open file", 
	FileDialog.LOAD);
      fdlg.show();
      
      String szPath = fdlg.getDirectory() +
        fdlg.getFile();
      
      ta.append("Open: " + szPath  + "\n");
	
      ta.append("CRC-32: " +
	calculate(szPath, new CRC32()) + "\n");
	
      ta.append("Adler-32: " +
	calculate(szPath, new Adler32()) + "\n");
    }
    
    else if(e.getSource().equals(miExit))
    {
      setVisible(false);
      System.exit(0);
    }
  }
  
  // ============================================
  // windowClosing
  // ============================================
  public void windowClosing(WindowEvent e)
  {
    setVisible(false);
    System.exit(0);
  }
  
  public void windowOpened(WindowEvent e) {}
  public void windowClosed(WindowEvent e) {}
  public void windowIconified(WindowEvent e) {}
  public void windowDeiconified(WindowEvent e) {}
  public void windowActivated(WindowEvent e) {}
  public void windowDeactivated(WindowEvent e) {}
  
  // ============================================
  // calculate
  // ============================================
  String calculate(String szPath, Checksum cs)
  {
    String s = "";
    byte[] buf = new byte[8000];
    int nLength = 0;
    
    try 
    {
      FileInputStream fis = 
        new FileInputStream(szPath);
            
      while(true)
      {
	nLength = fis.read(buf);
	if(nLength < 0)
	  break;
	  
        cs.update(buf, 0, nLength);
      }
       
      fis.close();
    }
    catch(Exception ex)
    {
      System.out.println(ex.toString());
    }
    
    s = new Long(cs.getValue()).toString();
    return s;
  }
}

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