001/* 002 * $Id: JBIG2Image.java 4784 2011-03-15 08:33:00Z blowagie $ 003 * 004 * This file is part of the iText (R) project. 005 * Copyright (c) 1998-2011 1T3XT BVBA 006 * Authors: Bruno Lowagie, Paulo Soares, et al. 007 * 008 * This program is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Affero General Public License version 3 010 * as published by the Free Software Foundation with the addition of the 011 * following permission added to Section 15 as permitted in Section 7(a): 012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 014 * 015 * This program is distributed in the hope that it will be useful, but 016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 017 * or FITNESS FOR A PARTICULAR PURPOSE. 018 * See the GNU Affero General Public License for more details. 019 * You should have received a copy of the GNU Affero General Public License 020 * along with this program; if not, see http://www.gnu.org/licenses or write to 021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 022 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 023 * http://itextpdf.com/terms-of-use/ 024 * 025 * The interactive user interfaces in modified source and object code versions 026 * of this program must display Appropriate Legal Notices, as required under 027 * Section 5 of the GNU Affero General Public License. 028 * 029 * In accordance with Section 7(b) of the GNU Affero General Public License, 030 * a covered work must retain the producer line in every PDF that is created 031 * or manipulated using iText. 032 * 033 * You can be released from the requirements of the license by purchasing 034 * a commercial license. Buying such a license is mandatory as soon as you 035 * develop commercial activities involving the iText software without 036 * disclosing the source code of your own applications. 037 * These activities include: offering paid services to customers as an ASP, 038 * serving PDFs on the fly in a web application, shipping iText with a closed 039 * source product. 040 * 041 * For more information, please contact iText Software Corp. at this 042 * address: sales@itextpdf.com 043 */ 044package com.itextpdf.text.pdf.codec; 045 046import com.itextpdf.text.ExceptionConverter; 047import com.itextpdf.text.Image; 048import com.itextpdf.text.ImgJBIG2; 049import com.itextpdf.text.pdf.RandomAccessFileOrArray; 050import com.itextpdf.text.error_messages.MessageLocalization; 051 052/** 053 * Support for JBIG2 Images. 054 * This class assumes that we are always embedding into a pdf. 055 * 056 * @since 2.1.5 057 */ 058public class JBIG2Image { 059 060 /** 061 * Gets a byte array that can be used as a /JBIG2Globals, 062 * or null if not applicable to the given jbig2. 063 * @param ra an random access file or array 064 * @return a byte array 065 */ 066 public static byte[] getGlobalSegment(RandomAccessFileOrArray ra ) { 067 try { 068 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra); 069 sr.read(); 070 return sr.getGlobal(true); 071 } catch (Exception e) { 072 return null; 073 } 074 } 075 076 /** 077 * returns an Image representing the given page. 078 * @param ra the file or array containing the image 079 * @param page the page number of the image 080 * @return an Image object 081 */ 082 public static Image getJbig2Image(RandomAccessFileOrArray ra, int page) { 083 if (page < 1) 084 throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.page.number.must.be.gt.eq.1")); 085 086 try { 087 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra); 088 sr.read(); 089 JBIG2SegmentReader.JBIG2Page p = sr.getPage(page); 090 Image img = new ImgJBIG2(p.pageBitmapWidth, p.pageBitmapHeight, p.getData(true), sr.getGlobal(true)); 091 return img; 092 } catch (Exception e) { 093 throw new ExceptionConverter(e); 094 } 095 } 096 097 /*** 098 * Gets the number of pages in a JBIG2 image. 099 * @param ra a random acces file array containing a JBIG2 image 100 * @return the number of pages 101 */ 102 public static int getNumberOfPages(RandomAccessFileOrArray ra) { 103 try { 104 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra); 105 sr.read(); 106 return sr.numberOfPages(); 107 } catch (Exception e) { 108 throw new ExceptionConverter(e); 109 } 110 } 111 112 113}