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/*
* DSI utilities
*
* Copyright (C) 2010-2023 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.compression;
import static org.junit.Assert.assertEquals;
import java.io.IOException;
import java.util.Random;
import it.unimi.dsi.bits.BitVector;
import it.unimi.dsi.fastutil.booleans.BooleanArrayList;
import it.unimi.dsi.fastutil.booleans.BooleanIterator;
import it.unimi.dsi.fastutil.io.FastByteArrayOutputStream;
import it.unimi.dsi.io.InputBitStream;
import it.unimi.dsi.io.OutputBitStream;
public abstract class CodecTestCase {
protected static void checkPrefixCodec(final PrefixCodec codec, final Random r) throws IOException {
final int[] symbol = new int[100];
final BooleanArrayList bits = new BooleanArrayList();
for(int i = 0; i < symbol.length; i++) symbol[i] = r.nextInt(codec.size());
for (final int element : symbol) {
final BitVector word = codec.codeWords()[element];
for(long j = 0; j < word.length(); j++) bits.add(word.getBoolean(j));
}
final BooleanIterator booleanIterator = bits.iterator();
final Decoder decoder = codec.decoder();
for (final int element : symbol) {
assertEquals(element, decoder.decode(booleanIterator));
}
final FastByteArrayOutputStream fbaos = new FastByteArrayOutputStream();
@SuppressWarnings("resource")
final
OutputBitStream obs = new OutputBitStream(fbaos, 0);
obs.write(bits.iterator());
obs.flush();
final InputBitStream ibs = new InputBitStream(fbaos.array);
for (final int element : symbol) {
assertEquals(element, decoder.decode(ibs));
}
}
protected void checkLengths(final int[] frequency, final int[] codeLength, final BitVector[] codeWord) {
for(int i = 0; i < frequency.length; i++)
assertEquals(Integer.toString(i), codeLength[i], codeWord[i].length());
}
}
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