/*

 * Copyright (c) 1997, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/* @test

   @bug 4017196

   @summary Test for correct implementation of PushbackInputStream.skip

 */

import java.io.*;

public class Skip {

    private static void dotest(PushbackInputStream in, int expected)

        throws Exception

    {

        int one, two, last, got;

        in.unread(4);

        in.unread(5);

        in.unread(6);

        in.skip(2);

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

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

        }

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

        one = in.read();

        two = in.read();

        if (two == 7) {

            in.unread(two);

            two = 0;

        }

        in.skip(2);

        last = in.read();

        got = (one + two + last);

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

        if (expected != got) {

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

        }

    }

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

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

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

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

        PushbackInputStream in;

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

        dotest(in, 1);

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

        dotest(in, 7);

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

        dotest(in, 4);

    }

}