ReadUByte.java

/*
 * Copyright 2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

 /* @test
 * @bug 6336960
 * @summary Validate that GZIPInputStream.readUByte throws the correct
 * exception when read() on the InputStream with which the GZIPInputStream was
 * created returns an out-of-bounds value.
 */

import java.io.*;
import java.util.zip.GZIPInputStream;

public class ReadUByte {
    /** Guaranteed to return a value that is out-of-spec for read(). */
    static class BrokenInputStream extends ByteArrayInputStream {
        BrokenInputStream() {
            super(new byte[16]);
        }

        public int read() {
            return -33;
        }
    }

    public static void realMain(String[] args) throws Throwable {
        try {
            new GZIPInputStream(new BrokenInputStream());
            fail("Failed to throw expected IOException");
        } catch (IOException ex) {
            String msg = ex.getMessage();
            if (msg.indexOf("ReadUByte$BrokenInputStream.read() returned value out of range") < 0) {
                fail("IOException contains incorrect message: '" + msg + "'");
            }
        }
    }

    //--------------------- Infrastructure ---------------------------
    static volatile int passed = 0, failed = 0;
    static void pass() {passed++;}
    static void fail() {failed++; Thread.dumpStack();}
    static void fail(String msg) {System.out.println(msg); fail();}
    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
    static void check(boolean cond) {if (cond) pass(); else fail();}
    static void equal(Object x, Object y) {
        if (x == null ? y == null : x.equals(y)) pass();
        else fail(x + " not equal to " + y);}
    public static void main(String[] args) throws Throwable {
        try {realMain(args);} catch (Throwable t) {unexpected(t);}
        System.out.println("\nPassed = " + passed + " failed = " + failed);
        if (failed > 0) throw new AssertionError("Some tests failed");}
}