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