J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2003 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.awt.image; |
| 27 | |
| 28 | import java.awt.image.*; |
| 29 | import java.io.InputStream; |
| 30 | import java.io.IOException; |
| 31 | import java.io.BufferedInputStream; |
| 32 | import java.util.Hashtable; |
| 33 | |
| 34 | public abstract class InputStreamImageSource implements ImageProducer, |
| 35 | ImageFetchable |
| 36 | { |
| 37 | ImageConsumerQueue consumers; |
| 38 | |
| 39 | ImageDecoder decoder; |
| 40 | ImageDecoder decoders; |
| 41 | |
| 42 | boolean awaitingFetch = false; |
| 43 | |
| 44 | abstract boolean checkSecurity(Object context, boolean quiet); |
| 45 | |
| 46 | int countConsumers(ImageConsumerQueue cq) { |
| 47 | int i = 0; |
| 48 | while (cq != null) { |
| 49 | i++; |
| 50 | cq = cq.next; |
| 51 | } |
| 52 | return i; |
| 53 | } |
| 54 | |
| 55 | synchronized int countConsumers() { |
| 56 | ImageDecoder id = decoders; |
| 57 | int i = countConsumers(consumers); |
| 58 | while (id != null) { |
| 59 | i += countConsumers(id.queue); |
| 60 | id = id.next; |
| 61 | } |
| 62 | return i; |
| 63 | } |
| 64 | |
| 65 | public void addConsumer(ImageConsumer ic) { |
| 66 | addConsumer(ic, false); |
| 67 | } |
| 68 | |
| 69 | synchronized void printQueue(ImageConsumerQueue cq, String prefix) { |
| 70 | while (cq != null) { |
| 71 | System.out.println(prefix+cq); |
| 72 | cq = cq.next; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | synchronized void printQueues(String title) { |
| 77 | System.out.println(title+"[ -----------"); |
| 78 | printQueue(consumers, " "); |
| 79 | for (ImageDecoder id = decoders; id != null; id = id.next) { |
| 80 | System.out.println(" "+id); |
| 81 | printQueue(id.queue, " "); |
| 82 | } |
| 83 | System.out.println("----------- ]"+title); |
| 84 | } |
| 85 | |
| 86 | synchronized void addConsumer(ImageConsumer ic, boolean produce) { |
| 87 | checkSecurity(null, false); |
| 88 | for (ImageDecoder id = decoders; id != null; id = id.next) { |
| 89 | if (id.isConsumer(ic)) { |
| 90 | // This consumer is already being fed. |
| 91 | return; |
| 92 | } |
| 93 | } |
| 94 | ImageConsumerQueue cq = consumers; |
| 95 | while (cq != null && cq.consumer != ic) { |
| 96 | cq = cq.next; |
| 97 | } |
| 98 | if (cq == null) { |
| 99 | cq = new ImageConsumerQueue(this, ic); |
| 100 | cq.next = consumers; |
| 101 | consumers = cq; |
| 102 | } else { |
| 103 | if (!cq.secure) { |
| 104 | Object context = null; |
| 105 | SecurityManager security = System.getSecurityManager(); |
| 106 | if (security != null) { |
| 107 | context = security.getSecurityContext(); |
| 108 | } |
| 109 | if (cq.securityContext == null) { |
| 110 | cq.securityContext = context; |
| 111 | } else if (!cq.securityContext.equals(context)) { |
| 112 | // If there are two different security contexts that both |
| 113 | // have a handle on the same ImageConsumer, then there has |
| 114 | // been a security breach and whether or not they trade |
| 115 | // image data is small fish compared to what they could be |
| 116 | // trading. Throw a Security exception anyway... |
| 117 | errorConsumer(cq, false); |
| 118 | throw new SecurityException("Applets are trading image data!"); |
| 119 | } |
| 120 | } |
| 121 | cq.interested = true; |
| 122 | } |
| 123 | if (produce && decoder == null) { |
| 124 | startProduction(); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | public synchronized boolean isConsumer(ImageConsumer ic) { |
| 129 | for (ImageDecoder id = decoders; id != null; id = id.next) { |
| 130 | if (id.isConsumer(ic)) { |
| 131 | return true; |
| 132 | } |
| 133 | } |
| 134 | return ImageConsumerQueue.isConsumer(consumers, ic); |
| 135 | } |
| 136 | |
| 137 | private void errorAllConsumers(ImageConsumerQueue cq, boolean needReload) { |
| 138 | while (cq != null) { |
| 139 | if (cq.interested) { |
| 140 | errorConsumer(cq, needReload); |
| 141 | } |
| 142 | cq = cq.next; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | private void errorConsumer(ImageConsumerQueue cq, boolean needReload) { |
| 147 | cq.consumer.imageComplete(ImageConsumer.IMAGEERROR); |
| 148 | if ( needReload && cq.consumer instanceof ImageRepresentation) { |
| 149 | ((ImageRepresentation)cq.consumer).image.flush(); |
| 150 | } |
| 151 | removeConsumer(cq.consumer); |
| 152 | } |
| 153 | |
| 154 | public synchronized void removeConsumer(ImageConsumer ic) { |
| 155 | for (ImageDecoder id = decoders; id != null; id = id.next) { |
| 156 | id.removeConsumer(ic); |
| 157 | } |
| 158 | consumers = ImageConsumerQueue.removeConsumer(consumers, ic, false); |
| 159 | } |
| 160 | |
| 161 | public void startProduction(ImageConsumer ic) { |
| 162 | addConsumer(ic, true); |
| 163 | } |
| 164 | |
| 165 | private synchronized void startProduction() { |
| 166 | if (!awaitingFetch) { |
| 167 | ImageFetcher.add(this); |
| 168 | awaitingFetch = true; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | private synchronized void stopProduction() { |
| 173 | if (awaitingFetch) { |
| 174 | ImageFetcher.remove(this); |
| 175 | awaitingFetch = false; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | public void requestTopDownLeftRightResend(ImageConsumer ic) { |
| 180 | } |
| 181 | |
| 182 | protected abstract ImageDecoder getDecoder(); |
| 183 | |
| 184 | protected ImageDecoder decoderForType(InputStream is, |
| 185 | String content_type) { |
| 186 | // Don't believe the content type - file extensions can |
| 187 | // lie. |
| 188 | /* |
| 189 | if (content_type.equals("image/gif")) { |
| 190 | return new GifImageDecoder(this, is); |
| 191 | } else if (content_type.equals("image/jpeg")) { |
| 192 | return new JPEGImageDecoder(this, is); |
| 193 | } else if (content_type.equals("image/x-xbitmap")) { |
| 194 | return new XbmImageDecoder(this, is); |
| 195 | } |
| 196 | else if (content_type == URL.content_jpeg) { |
| 197 | return new JpegImageDecoder(this, is); |
| 198 | } else if (content_type == URL.content_xbitmap) { |
| 199 | return new XbmImageDecoder(this, is); |
| 200 | } else if (content_type == URL.content_xpixmap) { |
| 201 | return new Xpm2ImageDecoder(this, is); |
| 202 | } |
| 203 | */ |
| 204 | |
| 205 | return null; |
| 206 | } |
| 207 | |
| 208 | protected ImageDecoder getDecoder(InputStream is) { |
| 209 | if (!is.markSupported()) |
| 210 | is = new BufferedInputStream(is); |
| 211 | try { |
| 212 | /* changed to support png |
| 213 | is.mark(6); |
| 214 | */ |
| 215 | is.mark(8); |
| 216 | int c1 = is.read(); |
| 217 | int c2 = is.read(); |
| 218 | int c3 = is.read(); |
| 219 | int c4 = is.read(); |
| 220 | int c5 = is.read(); |
| 221 | int c6 = is.read(); |
| 222 | // added to support png |
| 223 | int c7 = is.read(); |
| 224 | int c8 = is.read(); |
| 225 | // end of adding |
| 226 | is.reset(); |
| 227 | is.mark(-1); |
| 228 | |
| 229 | if (c1 == 'G' && c2 == 'I' && c3 == 'F' && c4 == '8') { |
| 230 | return new GifImageDecoder(this, is); |
| 231 | } else if (c1 == '\377' && c2 == '\330' && c3 == '\377') { |
| 232 | return new JPEGImageDecoder(this, is); |
| 233 | } else if (c1 == '#' && c2 == 'd' && c3 == 'e' && c4 == 'f') { |
| 234 | return new XbmImageDecoder(this, is); |
| 235 | // } else if (c1 == '!' && c2 == ' ' && c3 == 'X' && c4 == 'P' && |
| 236 | // c5 == 'M' && c6 == '2') { |
| 237 | // return new Xpm2ImageDecoder(this, is); |
| 238 | // added to support png |
| 239 | } else if (c1 == 137 && c2 == 80 && c3 == 78 && |
| 240 | c4 == 71 && c5 == 13 && c6 == 10 && |
| 241 | c7 == 26 && c8 == 10) { |
| 242 | return new PNGImageDecoder(this, is); |
| 243 | } |
| 244 | // end of adding |
| 245 | } catch (IOException e) { |
| 246 | } |
| 247 | |
| 248 | return null; |
| 249 | } |
| 250 | |
| 251 | public void doFetch() { |
| 252 | synchronized (this) { |
| 253 | if (consumers == null) { |
| 254 | awaitingFetch = false; |
| 255 | return; |
| 256 | } |
| 257 | } |
| 258 | ImageDecoder imgd = getDecoder(); |
| 259 | if (imgd == null) { |
| 260 | badDecoder(); |
| 261 | } else { |
| 262 | setDecoder(imgd); |
| 263 | try { |
| 264 | imgd.produceImage(); |
| 265 | } catch (IOException e) { |
| 266 | e.printStackTrace(); |
| 267 | // the finally clause will send an error. |
| 268 | } catch (ImageFormatException e) { |
| 269 | e.printStackTrace(); |
| 270 | // the finally clause will send an error. |
| 271 | } finally { |
| 272 | removeDecoder(imgd); |
| 273 | if ( Thread.currentThread().isInterrupted() || !Thread.currentThread().isAlive()) { |
| 274 | errorAllConsumers(imgd.queue, true); |
| 275 | } else { |
| 276 | errorAllConsumers(imgd.queue, false); |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | private void badDecoder() { |
| 283 | ImageConsumerQueue cq; |
| 284 | synchronized (this) { |
| 285 | cq = consumers; |
| 286 | consumers = null; |
| 287 | awaitingFetch = false; |
| 288 | } |
| 289 | errorAllConsumers(cq, false); |
| 290 | } |
| 291 | |
| 292 | private void setDecoder(ImageDecoder mydecoder) { |
| 293 | ImageConsumerQueue cq; |
| 294 | synchronized (this) { |
| 295 | mydecoder.next = decoders; |
| 296 | decoders = mydecoder; |
| 297 | decoder = mydecoder; |
| 298 | cq = consumers; |
| 299 | mydecoder.queue = cq; |
| 300 | consumers = null; |
| 301 | awaitingFetch = false; |
| 302 | } |
| 303 | while (cq != null) { |
| 304 | if (cq.interested) { |
| 305 | // Now that there is a decoder, security may have changed |
| 306 | // so reverify it here, just in case. |
| 307 | if (!checkSecurity(cq.securityContext, true)) { |
| 308 | errorConsumer(cq, false); |
| 309 | } |
| 310 | } |
| 311 | cq = cq.next; |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | private synchronized void removeDecoder(ImageDecoder mydecoder) { |
| 316 | doneDecoding(mydecoder); |
| 317 | ImageDecoder idprev = null; |
| 318 | for (ImageDecoder id = decoders; id != null; id = id.next) { |
| 319 | if (id == mydecoder) { |
| 320 | if (idprev == null) { |
| 321 | decoders = id.next; |
| 322 | } else { |
| 323 | idprev.next = id.next; |
| 324 | } |
| 325 | break; |
| 326 | } |
| 327 | idprev = id; |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | synchronized void doneDecoding(ImageDecoder mydecoder) { |
| 332 | if (decoder == mydecoder) { |
| 333 | decoder = null; |
| 334 | if (consumers != null) { |
| 335 | startProduction(); |
| 336 | } |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | void latchConsumers(ImageDecoder id) { |
| 341 | doneDecoding(id); |
| 342 | } |
| 343 | |
| 344 | synchronized void flush() { |
| 345 | decoder = null; |
| 346 | } |
| 347 | } |