001/*
002 * $Id: ImgJBIG2.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;
045
046import java.net.URL;
047import java.security.MessageDigest;
048
049/**
050 * Support for JBIG2 images.
051 * @since 2.1.5
052 */
053public class ImgJBIG2 extends Image {
054        
055        /** JBIG2 globals */
056        private  byte[] global;
057        /** A unique hash */
058        private  byte[] globalHash;
059        
060        /**
061         * Copy contstructor.
062         * @param       image another Image
063         */
064        ImgJBIG2(Image image) {
065                super(image);
066        }
067
068        /**
069         * Empty constructor.
070         */
071        public ImgJBIG2() {
072                super((Image) null);
073        }
074
075        /**
076         * Actual constructor for ImgJBIG2 images.
077         * @param       width   the width of the image
078         * @param       height  the height of the image
079         * @param       data    the raw image data
080         * @param       globals JBIG2 globals
081         */
082        public ImgJBIG2(int width, int height, byte[] data, byte[] globals) {
083                super((URL) null);
084        type = JBIG2;
085        originalType = ORIGINAL_JBIG2;
086                scaledHeight = height;
087                setTop(scaledHeight);
088                scaledWidth = width;
089                setRight(scaledWidth);
090                bpc = 1;
091                colorspace = 1;
092                rawData = data;
093                plainWidth = getWidth();
094                plainHeight = getHeight();
095                if ( globals != null ) {
096                        this.global = globals;
097                        MessageDigest md;
098                        try {
099                                md = MessageDigest.getInstance("MD5");
100                                md.update(this.global);
101                                this.globalHash = md.digest();
102                        } catch (Exception e) {
103                                //ignore
104                        }
105                        
106                }
107        }
108        
109        /**
110         * Getter for the JBIG2 global data.
111         * @return      an array of bytes
112         */
113        public byte[] getGlobalBytes() {
114                return this.global;
115        }
116        
117        /**
118         * Getter for the unique hash.
119         * @return      an array of bytes
120         */
121        public byte[] getGlobalHash() {
122                return this.globalHash;
123        }
124
125}