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/*
* Copyright (c) 2023, 2024, 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 7036144
* @summary Test concatenated gz streams when available() returns zero
* @run junit GZIPInputStreamAvailable
*/
import org.junit.jupiter.api.Test;
import java.io.*;
import java.util.*;
import java.util.zip.*;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
public class GZIPInputStreamAvailable {
public static final int NUM_COPIES = 100;
@Test
public void testZeroAvailable() throws IOException {
// Create some uncompressed data and then repeat it NUM_COPIES times
byte[] uncompressed1 = "this is a test".getBytes("ASCII");
byte[] uncompressedN = repeat(uncompressed1, NUM_COPIES);
// Compress the original data and then repeat that NUM_COPIES times
byte[] compressed1 = deflate(uncompressed1);
byte[] compressedN = repeat(compressed1, NUM_COPIES);
// (a) Read back inflated data from a stream where available() is accurate and verify
byte[] readback1 = inflate(new ByteArrayInputStream(compressedN));
assertArrayEquals(uncompressedN, readback1);
// (b) Read back inflated data from a stream where available() always returns zero and verify
byte[] readback2 = inflate(new ZeroAvailableStream(new ByteArrayInputStream(compressedN)));
assertArrayEquals(uncompressedN, readback2);
}
public static byte[] repeat(byte[] data, int count) {
byte[] repeat = new byte[data.length * count];
int off = 0;
for (int i = 0; i < count; i++) {
System.arraycopy(data, 0, repeat, off, data.length);
off += data.length;
}
return repeat;
}
public static byte[] deflate(byte[] data) throws IOException {
ByteArrayOutputStream buf = new ByteArrayOutputStream();
try (GZIPOutputStream out = new GZIPOutputStream(buf)) {
out.write(data);
}
return buf.toByteArray();
}
public static byte[] inflate(InputStream in) throws IOException {
return new GZIPInputStream(in).readAllBytes();
}
public static class ZeroAvailableStream extends FilterInputStream {
public ZeroAvailableStream(InputStream in) {
super(in);
}
@Override
public int available() {
return 0;
}
}
}
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