1 /*
   2  * Copyright (c) 2003, 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 4949609
  27  * @summary Tests that the readUnsignedInt returns the positive value
  28  */
  29 
  30 import java.io.ByteArrayInputStream;
  31 import java.io.ByteArrayOutputStream;
  32 import java.io.DataOutputStream;
  33 import java.io.IOException;
  34 
  35 import javax.imageio.ImageIO;
  36 import javax.imageio.stream.ImageInputStream;
  37 
  38 public class ReadUnsignedIntTest {
  39 
  40     public static void main(String[] args) throws IOException {
  41         ByteArrayOutputStream baos = new ByteArrayOutputStream();
  42         DataOutputStream dos = new DataOutputStream(baos);
  43 
  44         dos.writeInt(1);
  45         dos.writeInt(0x7fffffff);
  46         dos.writeInt(0x8fffffff);
  47         dos.writeInt(0xffffffff);
  48 
  49         dos.close();
  50 
  51         ByteArrayInputStream bais =
  52             new ByteArrayInputStream(baos.toByteArray());
  53         ImageInputStream iis = ImageIO.createImageInputStream(bais);
  54         for (int i=0; i<4; i++) {
  55             long res = iis.readUnsignedInt();
  56             if (res <= 0) {
  57                 throw new RuntimeException("Negative number was read: "+
  58                                            Long.toString(res, 16));
  59             }
  60         }
  61     }
  62 }