/*
* $Id: JBIG2Image.java 4065 2009-09-16 23:09:11Z psoares33 $
*
* Copyright 2009 by Nigel Kerr.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999-2009 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000-2009 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf.codec;
import com.lowagie.text.ExceptionConverter;
import com.lowagie.text.Image;
import com.lowagie.text.ImgJBIG2;
import com.lowagie.text.pdf.RandomAccessFileOrArray;
import com.lowagie.text.error_messages.MessageLocalization;
/**
* Support for JBIG2 Images.
* This class assumes that we are always embedding into a pdf.
*
* @since 2.1.5
*/
public class JBIG2Image {
/**
* Gets a byte array that can be used as a /JBIG2Globals,
* or null if not applicable to the given jbig2.
* @param ra an random access file or array
* @return a byte array
*/
public static byte[] getGlobalSegment(RandomAccessFileOrArray ra ) {
try {
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.read();
return sr.getGlobal(true);
} catch (Exception e) {
return null;
}
}
/**
* returns an Image representing the given page.
* @param ra the file or array containing the image
* @param page the page number of the image
* @return an Image object
*/
public static Image getJbig2Image(RandomAccessFileOrArray ra, int page) {
if (page < 1)
throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.page.number.must.be.gt.eq.1"));
try {
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.read();
JBIG2SegmentReader.JBIG2Page p = sr.getPage(page);
Image img = new ImgJBIG2(p.pageBitmapWidth, p.pageBitmapHeight, p.getData(true), sr.getGlobal(true));
return img;
} catch (Exception e) {
throw new ExceptionConverter(e);
}
}
/***
* Gets the number of pages in a JBIG2 image.
* @param ra a random acces file array containing a JBIG2 image
* @return the number of pages
*/
public static int getNumberOfPages(RandomAccessFileOrArray ra) {
try {
JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
sr.read();
return sr.numberOfPages();
} catch (Exception e) {
throw new ExceptionConverter(e);
}
}
}