/**
 * Written by SaEeD
 * Description : Library to return value of Md5 CheckSum for given file - This library can be used as Thread
 */
package mypack;
import java.io.*;
import java.security.MessageDigest;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JProgressBar;
import javax.swing.JTextField;

public class MD5CheckSum extends Thread implements Runnable
{
    private static JProgressBar myBar = null;
    public static long position;
    private static JTextField test = null;
    @SuppressWarnings("static-access")
    public MD5CheckSum(JProgressBar mBar, JTextField mine)
    {
        this.myBar = mBar;
        this.test = mine;
    }  
    @Override
    public void run(){
        
    }
    public static byte[] createCheckSum(String filename) throws Exception
    {
        position =0;
        InputStream fis = new FileInputStream(filename);
        File file_d = new File(filename);
        long fileSize = file_d.length();
                
        byte [] buffer = new byte[1024];
        MessageDigest complete = MessageDigest.getInstance("MD5");
        int numRead;
        do{
            numRead =  fis.read(buffer);
            position+= numRead;           
            if(numRead > 0){
                //position +=1024;
                long Value = (position * 100)/ fileSize;
                myBar.setValue((int)Value);
                complete.update(buffer, 0, numRead);
                
//                System.out.println("File Size: " + fileSize);
//                System.out.println("Current Postion: " + position);
//                System.out.println("%" + Value + " Completed.");
                
            }
        }while(numRead != -1);
        fis.close();
        System.out.println("[+]Creating MD5 Digest has been completed.");
        return complete.digest();
    }
    
    public static String getMD5CheckSum(String filename){
        String result = "";
        try {
            byte[] b = createCheckSum(filename);
            for (int i = 0; i < b.length; i++) {
                result += Integer.toString((b[i] & 0xff) + 0x100, 16).substring(1);
            }            
        } catch (Exception ex) {
            Logger.getLogger(MD5CheckSum.class.getName()).log(Level.SEVERE, null, ex);
        }
        test.setText(result);
        return result;
    }

}