1 /* ImageDecoder.java -- 2 Copyright (C) 1999, 2000, 2004 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 package gnu.java.awt.image; 39 40 import java.awt.image.ImageConsumer; 41 import java.awt.image.ImageProducer; 42 import java.io.ByteArrayInputStream; 43 import java.io.DataInput; 44 import java.io.EOFException; 45 import java.io.FileInputStream; 46 import java.io.IOException; 47 import java.io.InputStream; 48 import java.net.URL; 49 import java.util.Vector; 50 51 public abstract class ImageDecoder implements ImageProducer 52 { 53 Vector consumers = new Vector (); 54 String filename; 55 URL url; 56 byte[] data; 57 int offset; 58 int length; 59 InputStream input; 60 DataInput datainput; 61 62 static 63 { 64 // FIXME: there was some broken code here that looked like 65 // it wanted to rely on this property. I don't have any idea 66 // what it was intended to do. 67 // String endian = System.getProperties ().getProperty ("gnu.cpu.endian"); 68 } 69 ImageDecoder(String filename)70 public ImageDecoder (String filename) 71 { 72 this.filename = filename; 73 } 74 ImageDecoder(URL url)75 public ImageDecoder (URL url) 76 { 77 this.url = url; 78 } 79 ImageDecoder(InputStream is)80 public ImageDecoder (InputStream is) 81 { 82 this.input = is; 83 } 84 ImageDecoder(DataInput datainput)85 public ImageDecoder (DataInput datainput) 86 { 87 this.datainput = datainput; 88 } 89 ImageDecoder(byte[] imagedata, int imageoffset, int imagelength)90 public ImageDecoder (byte[] imagedata, int imageoffset, int imagelength) 91 { 92 data = imagedata; 93 offset = imageoffset; 94 length = imagelength; 95 } 96 addConsumer(ImageConsumer ic)97 public void addConsumer (ImageConsumer ic) 98 { 99 consumers.addElement (ic); 100 } 101 isConsumer(ImageConsumer ic)102 public boolean isConsumer (ImageConsumer ic) 103 { 104 return consumers.contains (ic); 105 } 106 removeConsumer(ImageConsumer ic)107 public void removeConsumer (ImageConsumer ic) 108 { 109 consumers.removeElement (ic); 110 } 111 startProduction(ImageConsumer ic)112 public void startProduction (ImageConsumer ic) 113 { 114 if (!isConsumer(ic)) 115 addConsumer(ic); 116 117 Vector list = (Vector) consumers.clone (); 118 try 119 { 120 // Create the input stream here rather than in the 121 // ImageDecoder constructors so that exceptions cause 122 // imageComplete to be called with an appropriate error 123 // status. 124 if (input == null) 125 { 126 try 127 { 128 if (url != null) 129 input = url.openStream(); 130 else if (datainput != null) 131 input = new DataInputStreamWrapper(datainput); 132 else 133 { 134 if (filename != null) 135 input = new FileInputStream (filename); 136 else 137 input = new ByteArrayInputStream (data, offset, length); 138 } 139 produce (list, input); 140 } 141 finally 142 { 143 input = null; 144 } 145 } 146 else 147 { 148 produce (list, input); 149 } 150 } 151 catch (Exception e) 152 { 153 for (int i = 0; i < list.size (); i++) 154 { 155 ImageConsumer ic2 = (ImageConsumer) list.elementAt (i); 156 ic2.imageComplete (ImageConsumer.IMAGEERROR); 157 } 158 } 159 } 160 requestTopDownLeftRightResend(ImageConsumer ic)161 public void requestTopDownLeftRightResend (ImageConsumer ic) 162 { 163 } 164 produce(Vector v, InputStream is)165 public abstract void produce (Vector v, InputStream is) throws IOException; 166 167 private static class DataInputStreamWrapper extends InputStream 168 { 169 private final DataInput datainput; 170 DataInputStreamWrapper(DataInput datainput)171 DataInputStreamWrapper(DataInput datainput) 172 { 173 this.datainput = datainput; 174 } 175 read()176 public int read() throws IOException 177 { 178 try 179 { 180 return datainput.readByte() & 0xFF; 181 } 182 catch (EOFException eofe) 183 { 184 return -1; 185 } 186 } 187 } 188 } 189