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