Android Open Source - Easy_File_Scramble Easy File Scramble

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License

The source code is released under:

Copyright (c) 2011, 2012, Hunter Davis All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are m...

Java Source Code

package com.hunterdavis.easyfilescramble;
/*from   ww  w. jav  a 2 s.  c om*/
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.google.ads.AdRequest;
import com.google.ads.AdView;

public class EasyFileScramble extends Activity {

  int SELECT_FILE = 122;

  String filePath = "";

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Create an anonymous implementation of OnClickListener
    OnClickListener loadButtonListner = new OnClickListener() {
      public void onClick(View v) {
        // do something when the button is clicked

        // in onCreate or any event where your want the user to
        Intent intent = new Intent(v.getContext(), FileDialog.class);
        intent.putExtra(FileDialog.START_PATH, "/sdcard");
        startActivityForResult(intent, SELECT_FILE);

      }
    };

    // Create an anonymous implementation of OnClickListener
    OnClickListener saveButtonListner = new OnClickListener() {
      public void onClick(View v) {
        // do something when the button is clicked

        scrambleFile();

      }
    };

    Button loadButton = (Button) findViewById(R.id.loadButton);
    loadButton.setOnClickListener(loadButtonListner);

    Button saveButton = (Button) findViewById(R.id.scramblebutton);
    saveButton.setOnClickListener(saveButtonListner);

    // Look up the AdView as a resource and load a request.
    AdView adView = (AdView) this.findViewById(R.id.adView);
    adView.loadAd(new AdRequest());

  }

  public void scrambleFile() {

    // get a handle to the name
    // read in .old file
    // write out file
    // delete .old file?

    
    // rename file to .old
    String fileString = filePath;
    File oldfile = new File(fileString);
    File newfile = new File(fileString + ".old");
    oldfile.renameTo(newfile);
    
    FileInputStream is = null;
    try {
      is = new FileInputStream(fileString + ".old");
    } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    // now try to open the first output file
    FileOutputStream os = null;
    try {
      os = new FileOutputStream(fileString);
    } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    byte[] buffer = new byte[8 * 1024];
    byte[] opposite = new byte[8 * 1024];
    int read; 
    byte tempbyte;
    try {
      while ((read = is.read(buffer)) > 0) {
        for (int i = 0; i < read; i++) {
          tempbyte = buffer[i]; 
          opposite[i] = (byte) ~tempbyte;
        }
        
        try {
          os.write(opposite,0,read);
        } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }

      }
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    
    try {
      is.close();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    
    try {
      os.close();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    newfile.delete();
    
    Toast.makeText(getBaseContext(),
        "Scrambled or Descrambled " + fileString, Toast.LENGTH_SHORT)
        .show();

  }

  public void saveMD5File() {
    String md5FileName = filePath + ".MD5";
    EditText t = (EditText) findViewById(R.id.mdfive);
    String md5ActualText = t.getText().toString();
    String fileNameString = getFileName();
    String fileString = md5ActualText + " *" + fileNameString;

    OutputStream os = null;

    // now try to open the first output file
    try {
      os = new FileOutputStream(md5FileName);
    } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    try {
      os.write(fileString.getBytes());
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    Toast.makeText(getBaseContext(),
        "Scrambled or Descrambled " + md5FileName, Toast.LENGTH_SHORT)
        .show();

  }

  public String getFileName() {
    int slashloc = filePath.lastIndexOf("/");
    if (slashloc < 0) {
      return filePath;
    } else {
      return filePath.substring(slashloc + 1);
    }
  }

  public void onActivityResult(final int requestCode, int resultCode,
      final Intent data) {
    if (resultCode == RESULT_OK) {
      if (requestCode == SELECT_FILE) {
        filePath = data.getStringExtra(FileDialog.RESULT_PATH);
        // set the filename txt
        changeFileNameText(filePath);
        Button enabButton = (Button) findViewById(R.id.scramblebutton);
        enabButton.setEnabled(true);
      }
    } else if (resultCode == RESULT_CANCELED) {
    }
  }

  public void changeFileNameText(String newFileName) {
    TextView t = (TextView) findViewById(R.id.fileText);
    t.setText(newFileName);
  }

  public static String md5(String fileString) {
    try {
      // Create MD5 Hash
      MessageDigest digest = java.security.MessageDigest
          .getInstance("MD5");
      InputStream is = null;
      try {
        is = new FileInputStream(fileString);
      } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
      byte[] buffer = new byte[8 * 1024];
      int read;
      try {
        while ((read = is.read(buffer)) > 0) {
          digest.update(buffer, 0, read);
        }
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
      byte messageDigest[] = digest.digest();

      // Create Hex String
      StringBuffer hexString = new StringBuffer();
      for (int i = 0; i < messageDigest.length; i++) {
        String h = Integer.toHexString(0xFF & messageDigest[i]);
        while (h.length() < 2)
          h = "0" + h;
        hexString.append(h);
      }
      return hexString.toString();

    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }
    return "";
  }

}

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