Direct Manipulation in a File

802662

Hi,

I am using Netbeans as IDE and I want to develop an application for mobile phone to change some bits of Images for Steganography.

my question is, can i have permission of direct access to change and save some bits of image, while i don't have license?

Thanks

tschodt

Hesam wrote:
I am using Netbeans as IDE and I want to develop an application for mobile phone to change some bits of Images for Steganography.

my question is, can i have permission of direct access to change and save some bits of image, while i don't have license?

Are you asking how to access arbitrary bytes in a file using Java?
Or is this a question about filesystem permissions? (nothing to do with Java).
Or are you asking if you legally allowed to alter an image for which you do not have a license to use? (nothing to do with Java).
Or something else?

802662

Wow,

OK. Actually, as you told, I want to manipulate arbitrary bits of image. I think it is possible since image is saved in RAM.

now, I want to save it (this manipulated image) on ROM again.

My question is here, can I save the image on ROM?

I have read in some websites that I can't save anything on ROM (because of security issues), if don't sign my application.
and also, I heard that to sign of application, I have to pay. because this is a student project, I don't want to pay anything.

So, my question is can I save the image (or any other file such as text files) on ROM, without application sign?

Thanks again.

tschodt

Your terminology seems out of whack.
The whole point of [url http://en.wikipedia.org/wiki/Read-only_memory] ROM (wiki link) is that you cannot write to it.
Or does ROM mean something else in mobile phone lingo?

802662

yes, you are right, I couldn't express very well.

How is this?
1- I want to load a image file (from EEPROM, Flash or any other technology which is currently used) into memory (RAM).

2- Manipulating some bits of it.

3- Save again in its location.


Is it possible or not?

darrylburke

<font size="2">To access the file system, the device must support the optional FileConnection API (JSR-75) and &nbsp;the MIDlet has to be signed, which costs money.</font>


db

762917

This can be helpful to you, check it:
http://download-llnw.oracle.com/javame/config/cldc/ref-impl/midp2.0/jsr118/index.html

I search a little about Steganography and what you are trying to do, maybe this can be helpful:

public class ImmutableImageFromByteArray extends MIDlet  implements CommandListener
{
  private Display display; 
  private Form fmMain;         // The main form
  private Command cmExit;

  public ImmutableImageFromByteArray()
  {
    display = Display.getDisplay(this);

    cmExit = new Command("Exit", Command.EXIT, 1);
        
    fmMain = new Form("");    
    fmMain.addCommand(cmExit);
    fmMain.setCommandListener(this);   


    fmMain.append(new ImageItem(null, imColor, ImageItem.LAYOUT_NEWLINE_BEFORE |ImageItem.LAYOUT_CENTER,   null));      
//    fmMain.append(imColor);
    
    display.setCurrent(fmMain);

  }

private static Image imColor = Image.createImage(
    new byte[] {
      (byte)0x89, (byte)0x50, (byte)0x4E, (byte)0x47, (byte)0x0D, (byte)0x0A, (byte)0x1A, (byte)0x0A, 
      (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x0D, (byte)0x49, (byte)0x48, (byte)0x44, (byte)0x52, 
      (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x4F, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x13, 
      (byte)0x08, (byte)0x06, (byte)0x00, (byte)0x00, (byte)0x01, (byte)0xA6, (byte)0x7F, (byte)0x60, 
      (byte)0x9C, (byte)0x00, (byte)0x00, (byte)0x06, (byte)0xBA, (byte)0x49, (byte)0x44, (byte)0x41, 
      (byte)0x54, (byte)0x78, (byte)0x9C, (byte)0xAD, (byte)0x58, (byte)0x7F, (byte)0x6C, (byte)0x1B, 
      (byte)0xF5, (byte)0x15, (byte)0xFF, (byte)0x5C, (byte)0x92, (byte)0x2A, (byte)0x4B, (byte)0xCB,
      .
      .
      .
      .
    },
    (int)0,
    (int)1779
);

In the link at the top you can find how this method works.
i hope this can help you.

802662

Wow Goariz, Thanks So much.

It helps me alot. one thowsend and one times thanks

Edited by: Hesam on Oct 6, 2010 11:37 AM

762917

Youre welcome but, you can thank me marking your question like answer and give some points.

Thanx.