1 /*
2 * $Id: JBIG2Image.java 3715 2009-02-23 15:02:23Z blowagie $
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
57 /**
58 * Support for JBIG2 Images.
59 * This class assumes that we are always embedding into a pdf.
60 *
61 * @since 2.1.5
62 */
63 public class JBIG2Image {
64
65 /**
66 * Gets a byte array that can be used as a /JBIG2Globals,
67 * or null if not applicable to the given jbig2.
68 * @param ra an random access file or array
69 * @return a byte array
70 */
71 public static byte[] getGlobalSegment(RandomAccessFileOrArray ra ) {
72 try {
73 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
74 sr.read();
75 return sr.getGlobal(true);
76 } catch (Exception e) {
77 return null;
78 }
79 }
80
81 /**
82 * returns an Image representing the given page.
83 * @param ra the file or array containing the image
84 * @param page the page number of the image
85 * @return an Image object
86 */
87 public static Image getJbig2Image(RandomAccessFileOrArray ra, int page) {
88 if (page < 1)
89 throw new IllegalArgumentException("The page number must be >= 1.");
90
91 try {
92 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
93 sr.read();
94 JBIG2SegmentReader.JBIG2Page p = sr.getPage(page);
95 Image img = new ImgJBIG2(p.pageBitmapWidth, p.pageBitmapHeight, p.getData(true), sr.getGlobal(true));
96 return img;
97 } catch (Exception e) {
98 throw new ExceptionConverter(e);
99 }
100 }
101
102 /***
103 * Gets the number of pages in a JBIG2 image.
104 * @param ra a random acces file array containing a JBIG2 image
105 * @return the number of pages
106 */
107 public static int getNumberOfPages(RandomAccessFileOrArray ra) {
108 try {
109 JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
110 sr.read();
111 return sr.numberOfPages();
112 } catch (Exception e) {
113 throw new ExceptionConverter(e);
114 }
115 }
116
117
118 }
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