jdk/test/java/io/PushbackInputStream/Skip.java
author duke
Sat, 01 Dec 2007 00:00:00 +0000
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/*
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 * Copyright 1997 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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/* @test
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   @bug 4017196
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   @summary Test for correct implementation of PushbackInputStream.skip
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 */
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import java.io.*;
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public class Skip {
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    private static void dotest(PushbackInputStream in, int expected)
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        throws Exception
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    {
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        int one, two, last, got;
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        in.unread(4);
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        in.unread(5);
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        in.unread(6);
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        in.skip(2);
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        if (in.read() != 4) {
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            throw new Exception("Failed the n < pushed back bytes case");
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        }
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        System.err.println("Passed the n < pushed back bytes case");
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        one = in.read();
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        two = in.read();
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        if (two == 7) {
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            in.unread(two);
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            two = 0;
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        }
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        in.skip(2);
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        last = in.read();
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        got = (one + two + last);
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        System.err.println("Expected " + expected + " got " + got);
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        if (expected != got) {
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            throw new Exception("Expected " + expected + " got " + got);
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        }
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    }
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    public static void main(String args[]) throws Exception {
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        byte[] data1 = {1, 7, 1, 0, 4};
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        byte[] data2 = {1, 1, 1, 1, 5};
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        byte[] data3 = {1, 7, 1, 3, 6};
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        PushbackInputStream in;
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        in = new PushbackInputStream(new ByteArrayInputStream(data1), 3);
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        dotest(in, 1);
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        in = new PushbackInputStream(new ByteArrayInputStream(data2), 3);
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        dotest(in, 7);
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        in = new PushbackInputStream(new ByteArrayInputStream(data3), 3);
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        dotest(in, 4);
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    }
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}