1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug     8190997
  27  * @summary Test verifies that ImageIO.read() throws proper IIOException
  28  *          when we have a PNG image with color type PNG_COLOR_PALETTE but
  29  *          missing the required PLTE chunk.
  30  * @run     main PngPLTEChunkMissingTest
  31  */
  32 
  33 import java.io.ByteArrayInputStream;
  34 import java.io.InputStream;
  35 import java.util.Base64;
  36 import javax.imageio.IIOException;
  37 import javax.imageio.ImageIO;
  38 
  39 public class PngPLTEChunkMissingTest {
  40 
  41     // PNG image stream missing the required PLTE chunk
  42     private static String inputImageBase64 = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAAB"
  43             + "CAMAAAA6fptVAAAACklEQVQYV2P4DwABAQEAWk1v8QAAAABJRU5ErkJgggo=";
  44 
  45     public static void main(String[] args) throws Exception {
  46 
  47         byte[] inputBytes = Base64.getDecoder().decode(inputImageBase64);
  48         InputStream in = new ByteArrayInputStream(inputBytes);
  49 
  50         /*
  51          * Attempt to read a PNG image of color type PNG_COLOR_PALETTE
  52          * but missing the required PLTE chunk.
  53          */
  54         try {
  55          ImageIO.read(in); 
  56         } catch (IIOException e) {
  57             /*
  58              * We expect ImageIO to throw IIOException with proper message
  59              * instead of throwing NullPointerException.
  60              */
  61             Throwable cause = e.getCause();
  62             if (cause == null ||
  63                 (!(cause.getMessage().
  64                  equals("PNG image doesn't contain required PLTE chunk")))){
  65                 throw e;
  66             }
  67         }
  68     }
  69 }
  70