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iText, a free Java-PDF library
/*
* $Id: ImageXRefViewer.java 3271 2008-04-18 20:39:42Z xlv $
* Copyright (c) 2005-2007 Bruno Lowagie, Carsten Hammer
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* This class was originally published under the MPL by Bruno Lowagie
* and Carsten Hammer.
* It was a part of iText, a Java-PDF library. You can now use it under
* the MIT License; for backward compatibility you can also use it under
* the MPL version 1.1: http://www.mozilla.org/MPL/
* A copy of the MPL license is bundled with the source code FYI.
*/
package com.lowagie.toolbox.plugins;
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Cursor;
import java.awt.Toolkit;
import java.io.File;
import java.io.IOException;
import javax.swing.BorderFactory;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSpinner;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import com.lowagie.text.pdf.PRStream;
import com.lowagie.text.pdf.PdfName;
import com.lowagie.text.pdf.PdfObject;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStream;
import com.lowagie.toolbox.AbstractTool;
import com.lowagie.toolbox.arguments.AbstractArgument;
import com.lowagie.toolbox.arguments.FileArgument;
import com.lowagie.toolbox.arguments.filters.PdfFilter;
import com.lowagie.toolbox.swing.EventDispatchingThread;
/**
* Allows you to inspect the Image XObjects inside a PDF file.
* @since 2.1.1 (imported from itexttoolbox project)
*/
public class ImageXRefViewer extends AbstractTool {
class SpinnerListener implements ChangeListener {
private ImageXRefViewer adaptee;
SpinnerListener(ImageXRefViewer adaptee) {
this.adaptee = adaptee;
}
/**
*
* @see javax.swing.event.ChangeListener#stateChanged(javax.swing.event.ChangeEvent)
* @param e ChangeEvent
*/
public void stateChanged(ChangeEvent e) {
adaptee.propertyChange(e);
}
}
static {
addVersion("$Id: ImageXRefViewer.java 3271 2008-04-18 20:39:42Z xlv $");
}
/** The total number of pictures inside the PDF. */
int total_number_of_pictures = 0;
/** The spinner that will allow you to select an image. */
JSpinner jSpinner = new JSpinner();
/** The panel that will show the images. */
JPanel image_panel = new JPanel();
/** The layout with the images. */
CardLayout layout = new CardLayout();
/**
* Creates a ViewImageXObjects object.
*/
public ImageXRefViewer() {
arguments.add(new FileArgument(this, "srcfile",
"The file you want to inspect", false, new PdfFilter()));
}
/**
*
* @see com.lowagie.toolbox.AbstractTool#getDestPathPDF()
* @throws InstantiationException
* @return File
*/
protected File getDestPathPDF() throws InstantiationException {
throw new InstantiationException("There is no file to show.");
}
/**
* @see com.lowagie.toolbox.AbstractTool#createFrame()
*/
protected void createFrame() {
internalFrame = new JInternalFrame("View Image XObjects", true, false,
true);
internalFrame.setSize(500, 300);
internalFrame.setJMenuBar(getMenubar());
internalFrame.getContentPane().setLayout(new BorderLayout());
JPanel master_panel = new JPanel();
master_panel.setLayout(new BorderLayout());
internalFrame.getContentPane().add(master_panel,
java.awt.BorderLayout.CENTER);
// images
image_panel.setLayout(layout);
jSpinner.addChangeListener(new SpinnerListener(this));
image_panel.setBorder(BorderFactory.createEtchedBorder());
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportView(image_panel);
master_panel.add(scrollPane, java.awt.BorderLayout.CENTER);
// spinner
JPanel spinner_panel = new JPanel();
spinner_panel.setLayout(new BorderLayout());
spinner_panel.add(jSpinner, java.awt.BorderLayout.CENTER);
JLabel image_label = new JLabel();
image_label.setHorizontalAlignment(SwingConstants.CENTER);
image_label.setText("images");
spinner_panel.add(image_label, java.awt.BorderLayout.NORTH);
master_panel.add(spinner_panel, java.awt.BorderLayout.NORTH);
System.out.println("=== Image XObject Viewer OPENED ===");
}
/**
*
* @see com.lowagie.toolbox.AbstractTool#valueHasChanged(com.lowagie.toolbox.arguments.AbstractArgument)
* @param arg StringArgument
*/
public void valueHasChanged(AbstractArgument arg) {
// do nothing
}
/**
* Reflects the change event in the JSpinner object.
*
* @param evt ChangeEvent
*/
public void propertyChange(ChangeEvent evt) {
int picture = Integer.parseInt(jSpinner.getValue().toString());
if (picture < 0) {
picture = 0;
jSpinner.setValue("0");
}
if (picture >= total_number_of_pictures) {
picture = total_number_of_pictures - 1;
jSpinner.setValue(String.valueOf(picture));
}
layout.show(image_panel, String.valueOf(picture));
image_panel.repaint();
}
/**
* Shows the images that are in the PDF as Image XObjects.
*
* @param args String[]
*/
public static void main(String[] args) {
ImageXRefViewer tool = new ImageXRefViewer();
if (args.length < 1) {
System.err.println(tool.getUsage());
}
tool.setMainArguments(args);
tool.execute();
}
/**
* @see com.lowagie.toolbox.AbstractTool#execute()
*/
public void execute() {
total_number_of_pictures = 0;
try {
if (getValue("srcfile") == null)
throw new InstantiationException(
"You need to choose a sourcefile");
EventDispatchingThread task = new EventDispatchingThread() {
public Object construct() {
try {
PdfReader reader = new PdfReader(
((File) getValue("srcfile")).getAbsolutePath());
for (int i = 0; i < reader.getXrefSize(); i++) {
PdfObject pdfobj = reader.getPdfObject(i);
if (pdfobj != null) {
if (pdfobj.isStream()) {
PdfStream pdfdict = (PdfStream) pdfobj;
PdfObject pdfsubtype = pdfdict
.get(PdfName.SUBTYPE);
if (pdfsubtype == null) {
continue;
}
if (!pdfsubtype.toString().equals(
PdfName.IMAGE.toString())) {
continue;
}
System.out.println("total_number_of_pictures: "
+ total_number_of_pictures);
System.out.println("height:"
+ pdfdict.get(PdfName.HEIGHT));
System.out.println("width:"
+ pdfdict.get(PdfName.WIDTH));
System.out.println("bitspercomponent:"
+ pdfdict.get(PdfName.BITSPERCOMPONENT));
byte[] barr = PdfReader
.getStreamBytesRaw((PRStream) pdfdict);
java.awt.Image im = Toolkit
.getDefaultToolkit().createImage(barr);
javax.swing.ImageIcon ii = new javax.swing.ImageIcon(im);
JLabel label = new JLabel();
label.setIcon(ii);
image_panel.add(label, String.valueOf(total_number_of_pictures++));
}
}
}
} catch (InstantiationException ex) {
} catch (IOException ex) {
}
internalFrame.setCursor(Cursor.getDefaultCursor());
return null;
}
};
internalFrame.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
task.start();
} catch (Exception e) {
JOptionPane.showMessageDialog(internalFrame, e.getMessage(), e
.getClass().getName(), JOptionPane.ERROR_MESSAGE);
System.err.println(e.getMessage());
}
}
}
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