/*
* $Id: JBIG2Image.java 5075 2012-02-27 16:36:18Z blowagie $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2012 1T3XT BVBA
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
* 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: sales@itextpdf.com
*/
package com.itextpdf.text.pdf.codec;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.Image;
import com.itextpdf.text.ImgJBIG2;
import com.itextpdf.text.pdf.RandomAccessFileOrArray;
import com.itextpdf.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);
}
}
}