1 /*

     2  * Copyright (c) 2014, 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 import java.io.ByteArrayInputStream;

    25 import java.io.IOException;

    26 import java.io.InputStream;

    27 import java.lang.reflect.Constructor;

    28 import java.lang.reflect.Method;

    29 

    30 /*

    31  * @test

    32  * @bug 8067870

    33  * @modules java.base/java.io:open

    34  * @summary verifies java.io.ObjectInputStream.PeekInputStream.skip works

    35  *          as intended

    36  */

    37 public class PeekInputStreamTest {

    38 

    39     public static void main(String[] args) throws ReflectiveOperationException,

    40             IOException {

    41 

    42         InputStream pin = createPeekInputStream(

    43                 new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

    44         peek(pin);

    45         if (pin.skip(1) != 1 || pin.read() != 2)

    46             throw new AssertionError();

    47 

    48         InputStream pin1 = createPeekInputStream(

    49                 new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

    50         if (pin1.skip(1) != 1 || pin1.read() != 2)

    51             throw new AssertionError();

    52 

    53         InputStream pin2 = createPeekInputStream(

    54                 new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

    55         if (pin2.skip(0) != 0 || pin2.read() != 1)

    56             throw new AssertionError();

    57 

    58         InputStream pin3 = createPeekInputStream(

    59                 new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

    60         if (pin3.skip(2) != 2 || pin3.read() != 3)

    61             throw new AssertionError();

    62 

    63         InputStream pin4 = createPeekInputStream(

    64                 new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

    65         if (pin4.skip(3) != 3 || pin4.read() != 4)

    66             throw new AssertionError();

    67 

    68         InputStream pin5 = createPeekInputStream(

    69                 new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

    70         if (pin5.skip(16) != 4 || pin5.read() != -1)

    71             throw new AssertionError();

    72     }

    73 

    74     private static InputStream createPeekInputStream(InputStream underlying)

    75             throws ReflectiveOperationException {

    76         Class<? extends InputStream> clazz =

    77                 Class.forName("java.io.ObjectInputStream$PeekInputStream")

    78                         .asSubclass(InputStream.class);

    79 

    80         Constructor<? extends InputStream> ctr =

    81                 clazz.getDeclaredConstructor(InputStream.class);

    82         ctr.setAccessible(true);

    83         return ctr.newInstance(underlying);

    84     }

    85 

    86     private static void peek(InputStream pin)

    87             throws ReflectiveOperationException {

    88         Method p = pin.getClass().getDeclaredMethod("peek");

    89         p.setAccessible(true);

    90         p.invoke(pin);

    91     }

    92 }