Skip.java revision 0:37a05a11f281 
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
29import java.io.*;
30
31public 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}
78