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Java example source code file (GZIPInZip.java)

This example Java source code file (GZIPInZip.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytearrayinputstream, bytearrayoutputstream, gzipinputstream, gzipinzip, gzipoutputstream, ioexception, runtimeexception, throwable, zip, zipentry, zipinputstream

The GZIPInZip.java Java example source code

/*
 * Copyright (c) 2013, 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 7021870 8023431 8026756
 * @summary Reading last gzip chain member must not close the input stream.
 *          Garbage following gzip entry must be ignored.
 */

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;


public class GZIPInZip {

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

        doTest(false, false);
        doTest(false, true);
        doTest(true, false);
        doTest(true, true);
    }

    private static void doTest(final boolean appendGarbage,
                               final boolean limitGISBuff)
            throws Throwable {

        byte[] buf;

        try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
             ZipOutputStream zos = new ZipOutputStream(baos)) {

            final byte[] xbuf = { 'x' };

            zos.putNextEntry(new ZipEntry("a.gz"));
            GZIPOutputStream gos1 = new GZIPOutputStream(zos);
            gos1.write(xbuf);
            gos1.finish();
            if (appendGarbage)
                zos.write(xbuf);
            zos.closeEntry();

            zos.putNextEntry(new ZipEntry("b.gz"));
            GZIPOutputStream gos2 = new GZIPOutputStream(zos);
            gos2.write(xbuf);
            gos2.finish();
            zos.closeEntry();

            zos.flush();
            buf = baos.toByteArray();
        }

        try (ByteArrayInputStream bais = new ByteArrayInputStream(buf);
             ZipInputStream zis = new ZipInputStream(bais)) {

            zis.getNextEntry();
            GZIPInputStream gis1 = limitGISBuff ?
                    new GZIPInputStream(zis, 4) :
                    new GZIPInputStream(zis);
            // try to read more than the entry has
            gis1.skip(2);

            try {
                zis.getNextEntry();
            } catch (IOException e) {
                throw new RuntimeException("ZIP stream was prematurely closed", e);
            }
        }
    }
}

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