JBIG2 Object Stream - Extract with file header?
Hello,
I'm attempting to extract JBIG2 images only from a PDF. The only problem is that the JBIG2 images are raw data streams without a header, and so I can't just save it into a .jb2 file, as no application will recognize it.
It looks like this:
<</Subtype/Image/Width 1740/Height 3002/ColorSpace/DeviceGray/BitsPerComponent 1/Decode[1 0]/Length 12268/Filter/JBIG2Decode>>
stream
(DATA)
endstream
etc.
I can easily extract the data, but how can I repair the header?
Thank you.
You will need to learn the JB2 file format and construct one based on the data in the ImageXObject dictionary.
Don't forget that JB2 also supports a global data block in the PDF as well, you will need that too!
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0
------------- 1) PRINT -------------
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My program is supposed to be a Driving instructor program that allows someone to enter a Name and Lesson Number, and it will pull up the Date, and Comments that the lesson took place. The information is saved in a file with the person's name, and saved as an array. We are required to use Object Streams for the file i/o. The only part of the program that I don't have working is the actual file i/o. The large commented section that I have in the datamanager class is the notes from the professor on the board and I haven't removed them yet. There are 4 classes for this file.
The main class that creates the program and calls the other classes.
import java.awt.*;
import javax.swing.*;
public class main {
/** Creates a new instance of main */
public main() {
* @param args the command line arguments
public static void main(String[] args)
guiLayout labelFrame = new guiLayout(); // creates LabelFrame
labelFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);
labelFrame.setSize(600, 200);
labelFrame.setVisible(true);
} The second class is the GUI class and event handler class.
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class guiLayout extends JFrame{
private JPanel centertop;
private JPanel centermiddle;
private JPanel centerbottom;
private JLabel dateLabel;
private JLabel nameLabel;
private JLabel lessonLabel;
private JLabel commentsLabel;
private JTextArea DateTextArea;
private JTextArea NameTextArea;
private JTextArea LessonTextArea;
private JTextArea CommentsTextArea;
private JButton Save;
private JButton Retrieve;
private String tempDay[];
private DataManager DMO;
/** Creates a new instance of guiLayout */
public guiLayout()
super("Drive Application");
setLayout(new FlowLayout());
dateLabel = new JLabel("Date (mm/dd/yy)");
nameLabel = new JLabel("Name");
lessonLabel = new JLabel("Lesson (1-10)");
commentsLabel = new JLabel("Comments");
DateTextArea = new JTextArea(1, 7);
NameTextArea = new JTextArea(1, 15);
LessonTextArea = new JTextArea(1, 2);
CommentsTextArea = new JTextArea(6, 30);
Save = new JButton( "Save");
Retrieve = new JButton( "Retrieve");
//insert into GUI
//TOP
centertop = new JPanel();
centertop.add(nameLabel);
centertop.add(NameTextArea);
centertop.add(lessonLabel);
centertop.add(LessonTextArea);
centertop.add(dateLabel);
centertop.add(DateTextArea);
centertop.setLayout(new GridLayout(6,1));
add(centertop, BorderLayout.NORTH);
centermiddle = new JPanel();
centermiddle.setLayout(new GridLayout(1,1));
centermiddle.add(CommentsTextArea);
add(centermiddle, BorderLayout.CENTER);
centerbottom = new JPanel();
centerbottom.setLayout(new GridLayout(1,3));
centerbottom.add (Save);
centerbottom.add(Retrieve);
add(centerbottom, BorderLayout.SOUTH);
ButtonHandler handler = new ButtonHandler();
Save.addActionListener( handler);
Retrieve.addActionListener(handler);
private class ButtonHandler implements ActionListener
public void actionPerformed(ActionEvent event)
String Namein = NameTextArea.getText();
String Datein = DateTextArea.getText();
String Commentsin = CommentsTextArea.getText();
int Lessonin = Integer.parseInt(LessonTextArea.getText());
if(event.getSource()==Save)
DMO.Save(Namein, Datein, Commentsin, Lessonin);
if(event.getSource()==Retrieve)
if(Lessonin >= 1 && Lessonin <= 10)
LessonRecord r = (DMO.Retrieve(Namein, Lessonin));
else
String errormess = "Lesson Number must be between 1 and 10!";
CommentsTextArea.setText(errormess);
}The third class is the DataManager class which handles the actual file i/o.
import java.io.*;
import java.util.*;
public class DataManager implements Serializable
//private String Path = "P:\\D00766703\\CET431\\Assign5";
private String Path = "C:\\Java";
FileInputStream fin;
FileOutputStream fout;
ObjectInputStream oin;
ObjectOutputStream oout;
public String Retrieve(String name, int lesson)
String itemFile = Path + name + ".ser";
File f = new File(itemFile);
if (f.exists() == true)
try
if(fin == null)
fin = new FileInputStream(itemFile);
oin = new ObjectInputStream(fin);
LessonRecord r[] = oin.readObject();
if(fin.available() == 0)
oout.close();
fout.close();
return r[lesson - 1];
catch(IOException ioe)
System.out.print(ioe);
else
LessonRecord LR = new LessonRecord();
LR.date = " ";
LR.comment = "File Not Found";
return LR;
/*create file object for Path\\Name
*if file exists
* create fileinputstream
* create objectinputstream - oin
* read array of lesson records
* LessonRecord |r[] = oin.readObject(); need cast to array here
* close object input stream and file input stream
* return |r[lesson - 1];
*else file does NOT EXIST
* LessonRecord LR = new LessonRecord();
* LR.date = " ";
* LR.comment = error message;
* return LR;
public void Save(String name, String date, String comment, int lesson)
String itemFile = Path + name + ".ser";
File f = new File(itemFile);
LessonRecord |r[];
if (f.exists() == true)
try
fin = new FileInputStream(itemFile);
oin = new ObjectInputStream(fin);
LessonRecord r[] = oin.readObject();
catch(IOException ioe)
System.out.print(ioe);
else
r = new LessonRecord[10];
r[lesson - 1] = new LessonRecord(date, comment);
fout = new FileOutputStream(itemFile, true);
oout = new ObjectOutputStream(fout);
oout.write(r);
oout.close();
fout.close();
/*create file object for Path\\Name
*LessonRecord |r[];
*if file exists
* create fileinputstream
* create objectinputstream - oin
* read array of lesson records
* LessonRecord |r[] = oin.readObject(); need cast to array here
* close object input stream and file input stream
*else
* |r = new LessonRecord[10];
*|r[lesson - 1] = new LessonRecord(date, comment);
*createfileoutputstream(BaseDir\\Name);
*createobjectoutputstream - oout
*oout.write(|r);
*closeobjectstream
*closefilestream
}And the fourth class is the LessonRecord class which is serializable and has the date and comments variables.
import java.io.Serializable;
public class LessonRecord implements Serializable
public String Date;
public String Comment;
/** Creates a new instance of LessonRecord */
public LessonRecord()
Date = "";
Comment = "";
public LessonRecord(String Datein, String Commentin)
Date = Datein;
Comment = Commentin;
}I could have sworn that the professor said to make it |r for the account records variable names, but I always get errors when I do that, and I need to know how to cast to an array too.hi Friend,
I have made some modification to your code. and try this...I think it will help you...
/*guiLayout.java*/
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class guiLayout extends JFrame{
private JPanel centertop;
private JPanel centermiddle;
private JPanel centerbottom;
private JLabel dateLabel;
private JLabel nameLabel;
private JLabel lessonLabel;
private JLabel commentsLabel;
private JTextArea DateTextArea;
private JTextArea NameTextArea;
private JTextArea LessonTextArea;
private JTextArea CommentsTextArea;
private JButton Save;
private JButton Retrieve;
private String tempDay[];
private DataManager DMO;
/** Creates a new instance of guiLayout */
public guiLayout()
super("Drive Application");
DMO=new DataManager();
setLayout(new FlowLayout());
dateLabel = new JLabel("Date (mm/dd/yy)");
nameLabel = new JLabel("Name");
lessonLabel = new JLabel("Lesson (1-10)");
commentsLabel = new JLabel("Comments");
DateTextArea = new JTextArea(1, 7);
NameTextArea = new JTextArea(1, 15);
LessonTextArea = new JTextArea(1, 2);
CommentsTextArea = new JTextArea(6, 30);
Save = new JButton( "Save");
Retrieve = new JButton( "Retrieve");
//insert into GUI
//TOP
centertop = new JPanel();
centertop.add(nameLabel);
centertop.add(NameTextArea);
centertop.add(lessonLabel);
centertop.add(LessonTextArea);
centertop.add(dateLabel);
centertop.add(DateTextArea);
centertop.setLayout(new GridLayout(6,1));
add(centertop, BorderLayout.NORTH);
centermiddle = new JPanel();
centermiddle.setLayout(new GridLayout(1,1));
centermiddle.add(CommentsTextArea);
add(centermiddle, BorderLayout.CENTER);
centerbottom = new JPanel();
centerbottom.setLayout(new GridLayout(1,3));
centerbottom.add (Save);
centerbottom.add(Retrieve);
add(centerbottom, BorderLayout.SOUTH);
ButtonHandler handler = new ButtonHandler();
Save.addActionListener( handler);
Retrieve.addActionListener(handler);
private class ButtonHandler implements ActionListener
public void actionPerformed(ActionEvent event)
String Namein = NameTextArea.getText();
int Lessonin = Integer.parseInt(LessonTextArea.getText());
if(event.getSource()==Save)
String Datein = DateTextArea.getText();
String Commentsin = CommentsTextArea.getText();
DMO.Save(Namein, Datein, Commentsin, Lessonin);
if(event.getSource()==Retrieve)
if(Lessonin >= 1 && Lessonin <= 10)
LessonRecord r = (DMO.Retrieve(Namein, Lessonin));
System.out.println("Retrieve:"+ r.Comment+":"+r.Date);
else
String errormess = "Lesson Number must be between 1 and 10!";
CommentsTextArea.setText(errormess);
/*DataManager.java*/
import java.io.*;
import java.util.*;
public class DataManager implements Serializable
//private String Path = "P:\\D00766703\\CET431\\Assign5";
private String Path = "C:/Java";
FileInputStream fin;
FileOutputStream fout;
ObjectInputStream oin;
ObjectOutputStream oout;
public LessonRecord Retrieve(String name, int lesson)
String itemFile = Path + name + ".ser";
File f = new File(itemFile);
LessonRecord[] r=null;
if (f.exists() == true)
try
if(fin == null)
fin = new FileInputStream(itemFile);
oin = new ObjectInputStream(fin);
r= (LessonRecord[])oin.readObject();
System.out.println(r[lesson-1].Comment+":"+r[lesson-1].Date);
catch(IOException ioe)
System.out.print(ioe);
catch(ClassNotFoundException c){
c.printStackTrace();
finally
try {
if(fin!=null)fin.close();
if(oin!=null)oin.close();
} catch (IOException ex) {
ex.printStackTrace();
else
LessonRecord LR = new LessonRecord();
LR.Date = " ";
LR.Comment = "File Not Found";
return LR;
/*create file object for Path\\Name
*if file exists
* create fileinputstream
* create objectinputstream - oin
* read array of lesson records
* LessonRecord |r[] = oin.readObject(); need cast to array here
* close object input stream and file input stream
* return |r[lesson - 1];
*else file does NOT EXIST
* LessonRecord LR = new LessonRecord();
* LR.date = " ";
* LR.comment = error message;
* return LR;
return r[lesson - 1];
public void Save(String name, String date, String comment, int lesson)
String itemFile = Path + name + ".ser";
File f = new File(itemFile);
LessonRecord r[]=new LessonRecord[10];
if (f.exists() == true)
try
fin = new FileInputStream(itemFile);
oin = new ObjectInputStream(fin);
r = (LessonRecord[])oin.readObject();
catch(IOException ioe)
System.out.print(ioe);
catch(ClassNotFoundException c){
c.printStackTrace();
finally
try {
if(fin!=null)fin.close();
if(oin!=null)oin.close();
} catch (IOException ex) {
ex.printStackTrace();
else
r = new LessonRecord[10];
try
r[lesson - 1] = new LessonRecord(date, comment);
fout = new FileOutputStream(itemFile);
oout = new ObjectOutputStream(fout);
oout.writeObject(r);
oout.flush();
catch(IOException ioe)
finally
try {
if(fout!=null)fout.close();
if(oout!=null)oout.close();
} catch (IOException ex) {
ex.printStackTrace();
/*create file object for Path\\Name
*LessonRecord |r[];
*if file exists
* create fileinputstream
* create objectinputstream - oin
* read array of lesson records
* LessonRecord |r[] = oin.readObject(); need cast to array here
* close object input stream and file input stream
*else
* |r = new LessonRecord[10];
*|r[lesson - 1] = new LessonRecord(date, comment);
*createfileoutputstream(BaseDir\\Name);
*createobjectoutputstream - oout
*oout.write(|r);
*closeobjectstream
*closefilestream
}main.java and LessonRecord.java does not have any changes so you use the old code....
Thanks
Edited by: rajaram on Sep 28, 2007 1:24 PM -
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Hi,
I've got a problem in my app.
Namely, my app stores data as objects written to the files. Everything is OK, when I write some data (objects of a class defined by me) to the file (by using writeObject method from ObjectOutputStream) and then I'm reading it sequencially by the corresponding readObject method (from ObjectInputStream).
Problems start when I add new objects to the already existing file (to the end of this file). Then, when I'm trying to read newly written data, I get an exception:
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If anyone of you know something about this issue, please help!
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* Created on 2004-12-23
package com.cpic.msgbus.monitor.util.cachequeue;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
* @author elgs This is a very high performance implemention of Cache.
public class StackCache implements Cache
protected long seed = 0;
protected RandomAccessFile raf;
protected int count;
protected String cacheDeviceName;
protected Adapter adapter;
protected long pointer = 0;
protected File f;
public StackCache(String name) throws IOException
cacheDeviceName = name;
f = new File(Const.cacheHome + name);
raf = new RandomAccessFile(f, "rw");
if (raf.length() == 0)
raf.writeLong(0L);
* Whne the cache file is getting large in size and may there be fragments,
* we should do a shrink.
public synchronized void shrink() throws IOException
int BUF = 8192;
long pointer = getPointer();
long size = pointer + 4;
File temp = new File(Const.cacheHome + getCacheDeviceName() + ".shrink");
FileInputStream in = new FileInputStream(f);
FileOutputStream out = new FileOutputStream(temp);
byte[] buf = new byte[BUF];
long runs = size / BUF;
int mode = (int) size % BUF;
for (long l = 0; l < runs; ++l)
in.read(buf);
out.write(buf);
in.read(buf, 0, mode);
out.write(buf, 0, mode);
out.flush();
out.close();
in.close();
raf.close();
f.delete();
temp.renameTo(f);
raf = new RandomAccessFile(f, "rw");
private synchronized long getPointer() throws IOException
long l = raf.getFilePointer();
raf.seek(0);
long pointer = raf.readLong();
raf.seek(l);
return pointer < 8 ? 4 : pointer;
* (non-Javadoc)
* @see com.cpic.msgbus.monitor.util.cachequeue.Cache#load()
public synchronized byte[] load() throws IOException
pointer = getPointer();
if (pointer < 8)
return null;
raf.seek(pointer);
int length = raf.readInt();
pointer = pointer - length - 4;
raf.seek(0);
raf.writeLong(pointer);
byte[] b = new byte[length];
raf.seek(pointer + 4);
raf.read(b);
--count;
return b;
* (non-Javadoc)
* @see com.cpic.msgbus.monitor.util.cachequeue.Cache#save(byte[])
public synchronized void save(byte[] b) throws IOException
pointer = getPointer();
int length = b.length;
pointer += 4;
raf.seek(pointer);
raf.write(b);
raf.writeInt(length);
pointer = raf.getFilePointer() - 4;
raf.seek(0);
raf.writeLong(pointer);
++count;
* (non-Javadoc)
* @see com.cpic.msgbus.monitor.util.cachequeue.Cache#getCachedObjectsCount()
public synchronized int getCachedObjectsCount()
return count;
* (non-Javadoc)
* @see com.cpic.msgbus.monitor.util.cachequeue.Cache#getCacheDeviceName()
public String getCacheDeviceName()
return cacheDeviceName;
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Hi ,
I am downloading internal table to excel on the desktop using GUI_DOWNLOAD with file type "DBF".
Internal table I use do not have any header.
But I do see the header in the downloaded file.
It displays 1 row as " F1 F2 F3..ETC" heading for each column.
Is there any variable we need to set to suppress header.
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I tried using GUI_DOWNLOAD with FILE TYPE as "DBF", and i see the problem as mentioned. My question to you is:
1. Why do you need 'DBF' format?
2. Is it required to save the file as '.CSV'? Can you not try to save in '.XLS' file?
Plz revert back.
BR,
Suhas -
Need to remove header When using GUI_DOWNLOAD with file type "DBF"
Hi ALL,
I am using GUI_DOWNLOAD function module to downlaod data to csv file . I have taken FILE TYPE as "DBF" . After download , I have found data is downloaded along with a default header . Now how can I avoid Header while downloading.
Please help me to solve this problem.
thanks and regards,
Dilip
Edited by: dilip kumar on Jun 9, 2009 11:51 AMHello Dilip,
I tried using GUI_DOWNLOAD with FILE TYPE as "DBF", and i see the problem as mentioned. My question to you is:
1. Why do you need 'DBF' format?
2. Is it required to save the file as '.CSV'? Can you not try to save in '.XLS' file?
Plz revert back.
BR,
Suhas -
How can I save an object Image in a file with .jpg or .gif format?
Greetings
I'm programming a Ray Tracer but now I need to know like save an object Image in a file with .jpg or .gif format. Could anyone help me, please? It's very important to me do this as soon as possible. Thanks.In 1.4 you have ImageIO available ... javax.imageio.ImageIO.write is the method to call.
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Extract schema, each object in its own file, maintain dependencies
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is there a tool that exports a schema DDL so that each schema object creae statement is stored in a separated file, and a general script is provided which creates objects in the right order (dependencies).
I know toad can do it, but it's a bit over my budget.
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create new
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then you may cut copy and paste
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place two object on the new file
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In photoshop cs2 you can rasterize the smart objects and that should make the Cut function available.
Select both placed layers, right click on the area to the right of the tumbnail and select Rasterize Layers.
If in photoshop cs2 you to Help>Photoshop Help and look under Layers>Smart Objects, that should give you a good overview of what smart objects are. -
When I dont extract the files and go straight to the installer it says that the download was inturrupted and to try again and it wont work any of the times I try.
Try clearing your browser's cache before downloading again, or try a different browser, or download the installer on a different machine, check it with Winrar or 7-Zip, then put it on a memory stick to take back to your own computer.
You may find the direct download links and other information in Troubleshooting issues with iTunes for Windows updates useful.
tt2
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