75 lines
3.1 KiB
Java
75 lines
3.1 KiB
Java
/*
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* Copyright (c) 2020, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import org.testng.Assert;
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import org.testng.annotations.Test;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.nio.charset.StandardCharsets;
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import java.util.zip.GZIPInputStream;
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import java.util.zip.GZIPOutputStream;
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/**
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* @test
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* @bug 8244706
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* @summary Verify that the OS header flag in the stream written out by java.util.zip.GZIPOutputStream
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* has the correct expected value
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* @run testng GZIPOutputStreamHeaderTest
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*/
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public class GZIPOutputStreamHeaderTest {
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private static final int OS_HEADER_INDEX = 9;
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private static final int HEADER_VALUE_OS_UNKNOWN = 255;
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/**
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* Test that the {@code OS} header field in the GZIP output stream
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* has a value of {@code 255} which represents "unknown"
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*/
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@Test
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public void testOSHeader() throws Exception {
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final String data = "Hello world!!!";
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final ByteArrayOutputStream baos = new ByteArrayOutputStream();
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try (final GZIPOutputStream gzipOutputStream = new GZIPOutputStream(baos);) {
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gzipOutputStream.write(data.getBytes(StandardCharsets.UTF_8));
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}
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final byte[] compressed = baos.toByteArray();
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Assert.assertNotNull(compressed, "Compressed data is null");
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Assert.assertEquals(toUnsignedByte(compressed[OS_HEADER_INDEX]), HEADER_VALUE_OS_UNKNOWN,
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"Unexpected value for OS header");
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// finally verify that the compressed data is readable back to the original
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final String uncompressed;
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try (final ByteArrayOutputStream os = new ByteArrayOutputStream();
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final ByteArrayInputStream bis = new ByteArrayInputStream(compressed);
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final GZIPInputStream gzipInputStream = new GZIPInputStream(bis)) {
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gzipInputStream.transferTo(os);
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uncompressed = new String(os.toByteArray(), StandardCharsets.UTF_8);
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}
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Assert.assertEquals(uncompressed, data, "Unexpected data read from GZIPInputStream");
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}
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private static int toUnsignedByte(final byte b) {
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return b & 0xff;
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}
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}
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