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/*
* DSI utilities
*
* Copyright (C) 2010-2022 Sebastiano Vigna
*
* This program and the accompanying materials are made available under the
* terms of the GNU Lesser General Public License v2.1 or later,
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html,
* or the Apache Software License 2.0, which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* This program 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.
*
* SPDX-License-Identifier: LGPL-2.1-or-later OR Apache-2.0
*/
package it.unimi.dsi.util;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import org.junit.Test;
import it.unimi.dsi.fastutil.longs.LongArrayList;
import it.unimi.dsi.fastutil.longs.LongList;
import it.unimi.dsi.io.InputBitStream;
import it.unimi.dsi.io.OutputBitStream;
/**
* @author Fabien Campagne
* @author Sebastiano Vigna
*/
public class SemiExternalGammaListTest {
private static InputBitStream buildInputStream(final LongList longs) throws IOException {
final byte[] array = new byte[longs.size() * 4];
@SuppressWarnings("resource")
final
OutputBitStream streamer = new OutputBitStream(array);
for (int i = 0; i < longs.size(); i++) streamer.writeLongGamma(longs.getLong(i));
final int size = (int)(streamer.writtenBits() / 8) + ((streamer.writtenBits() % 8) == 0 ? 0 : 1);
final byte[] smaller = new byte[size];
System.arraycopy(array, 0, smaller, 0, size);
return new InputBitStream(smaller);
}
@Test
public void testSemiExternalGammaListGammaCoding() throws IOException {
final long[] longs = { 10, 300, 450, 650, 1000, 1290, 1699 };
final LongList listLongs = new LongArrayList(longs);
SemiExternalGammaList list = new SemiExternalGammaList(buildInputStream(listLongs), 1, listLongs.size());
for (int i = 0; i < longs.length; ++i) {
assertEquals(("test failed for index: " + i), longs[i], list.getLong(i));
}
list = new SemiExternalGammaList(buildInputStream(listLongs), 2, listLongs.size());
for (int i = 0; i < longs.length; ++i) {
assertEquals(("test failed for index: " + i), longs[i], list.getLong(i));
}
list = new SemiExternalGammaList(buildInputStream(listLongs), 4, listLongs.size());
for (int i = 0; i < longs.length; ++i) {
assertEquals(("test failed for index: " + i), longs[i], list.getLong(i));
}
list = new SemiExternalGammaList(buildInputStream(listLongs), 7, listLongs.size());
for (int i = 0; i < longs.length; ++i) {
assertEquals(("test failed for index: " + i), longs[i], list.getLong(i));
}
list = new SemiExternalGammaList(buildInputStream(listLongs), 8, listLongs.size());
for (int i = 0; i < longs.length; ++i) {
assertEquals(("test failed for index: " + i), longs[i], list.getLong(i));
}
}
@Test
public void testEmptySemiExternalGammaListGammaCoding() throws IOException {
final long[] longs = { };
final LongList listOffsets = new LongArrayList(longs);
new SemiExternalGammaList(buildInputStream(listOffsets), 1, listOffsets.size());
assertTrue(true);
}
}
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