1 /* 2 * $Id$ 3 * 4 * Copyright 2009 by Nigel Kerr. 5 * 6 * The contents of this file are subject to the Mozilla Public License Version 1.1 7 * (the "License"); you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at http://www.mozilla.org/MPL/ 9 * 10 * Software distributed under the License is distributed on an "AS IS" basis, 11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 12 * for the specific language governing rights and limitations under the License. 13 * 14 * The Original Code is 'iText, a free JAVA-PDF library'. 15 * 16 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by 17 * the Initial Developer are Copyright (C) 1999-2009 by Bruno Lowagie. 18 * All Rights Reserved. 19 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer 20 * are Copyright (C) 2000-2009 by Paulo Soares. All Rights Reserved. 21 * 22 * Contributor(s): all the names of the contributors are added in the source code 23 * where applicable. 24 * 25 * Alternatively, the contents of this file may be used under the terms of the 26 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the 27 * provisions of LGPL are applicable instead of those above. If you wish to 28 * allow use of your version of this file only under the terms of the LGPL 29 * License and not to allow others to use your version of this file under 30 * the MPL, indicate your decision by deleting the provisions above and 31 * replace them with the notice and other provisions required by the LGPL. 32 * If you do not delete the provisions above, a recipient may use your version 33 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE. 34 * 35 * This library is free software; you can redistribute it and/or modify it 36 * under the terms of the MPL as stated above or under the terms of the GNU 37 * Library General Public License as published by the Free Software Foundation; 38 * either version 2 of the License, or any later version. 39 * 40 * This library is distributed in the hope that it will be useful, but WITHOUT 41 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 42 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more 43 * details. 44 * 45 * If you didn't download this code from the following link, you should check if 46 * you aren't using an obsolete version: 47 * http://www.lowagie.com/iText/ 48 */ 49 50 package com.lowagie.text.pdf.codec; 51 52 import com.lowagie.text.ExceptionConverter; 53 import com.lowagie.text.Image; 54 import com.lowagie.text.ImgJBIG2; 55 import com.lowagie.text.pdf.RandomAccessFileOrArray; 56 import com.lowagie.text.error_messages.MessageLocalization; 57 58 /** 59 * Support for JBIG2 Images. 60 * This class assumes that we are always embedding into a pdf. 61 * 62 * @since 2.1.5 63 */ 64 public class JBIG2Image { 65 66 /** 67 * Gets a byte array that can be used as a /JBIG2Globals, 68 * or null if not applicable to the given jbig2. 69 * @param ra an random access file or array 70 * @return a byte array 71 */ getGlobalSegment(RandomAccessFileOrArray ra )72 public static byte[] getGlobalSegment(RandomAccessFileOrArray ra ) { 73 try { 74 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra); 75 sr.read(); 76 return sr.getGlobal(true); 77 } catch (Exception e) { 78 return null; 79 } 80 } 81 82 /** 83 * returns an Image representing the given page. 84 * @param ra the file or array containing the image 85 * @param page the page number of the image 86 * @return an Image object 87 */ getJbig2Image(RandomAccessFileOrArray ra, int page)88 public static Image getJbig2Image(RandomAccessFileOrArray ra, int page) { 89 if (page < 1) 90 throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.page.number.must.be.gt.eq.1")); 91 92 try { 93 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra); 94 sr.read(); 95 JBIG2SegmentReader.JBIG2Page p = sr.getPage(page); 96 Image img = new ImgJBIG2(p.pageBitmapWidth, p.pageBitmapHeight, p.getData(true), sr.getGlobal(true)); 97 return img; 98 } catch (Exception e) { 99 throw new ExceptionConverter(e); 100 } 101 } 102 103 /*** 104 * Gets the number of pages in a JBIG2 image. 105 * @param ra a random acces file array containing a JBIG2 image 106 * @return the number of pages 107 */ getNumberOfPages(RandomAccessFileOrArray ra)108 public static int getNumberOfPages(RandomAccessFileOrArray ra) { 109 try { 110 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra); 111 sr.read(); 112 return sr.numberOfPages(); 113 } catch (Exception e) { 114 throw new ExceptionConverter(e); 115 } 116 } 117 118 119 } 120