1 /*

     2  * Copyright 1997 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.

     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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /* @test

    25    @bug 4017196

    26    @summary Test for correct implementation of PushbackInputStream.skip

    27  */

    28 

    29 import java.io.*;

    30 

    31 public class Skip {

    32 

    33     private static void dotest(PushbackInputStream in, int expected)

    34         throws Exception

    35     {

    36         int one, two, last, got;

    37 

    38         in.unread(4);

    39         in.unread(5);

    40         in.unread(6);

    41         in.skip(2);

    42         if (in.read() != 4) {

    43             throw new Exception("Failed the n < pushed back bytes case");

    44         }

    45         System.err.println("Passed the n < pushed back bytes case");

    46         one = in.read();

    47         two = in.read();

    48 

    49         if (two == 7) {

    50             in.unread(two);

    51             two = 0;

    52         }

    53         in.skip(2);

    54         last = in.read();

    55         got = (one + two + last);

    56         System.err.println("Expected " + expected + " got " + got);

    57         if (expected != got) {

    58             throw new Exception("Expected " + expected + " got " + got);

    59         }

    60     }

    61 

    62 

    63     public static void main(String args[]) throws Exception {

    64         byte[] data1 = {1, 7, 1, 0, 4};

    65         byte[] data2 = {1, 1, 1, 1, 5};

    66         byte[] data3 = {1, 7, 1, 3, 6};

    67         PushbackInputStream in;

    68 

    69         in = new PushbackInputStream(new ByteArrayInputStream(data1), 3);

    70         dotest(in, 1);

    71         in = new PushbackInputStream(new ByteArrayInputStream(data2), 3);

    72         dotest(in, 7);

    73         in = new PushbackInputStream(new ByteArrayInputStream(data3), 3);

    74         dotest(in, 4);

    75     }

    76 

    77 }