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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.io;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.Random;
import org.junit.Test;
import it.unimi.dsi.fastutil.io.FastByteArrayOutputStream;
import it.unimi.dsi.fastutil.longs.LongArrayList;
import it.unimi.dsi.util.XoRoShiRo128PlusRandom;
@SuppressWarnings("resource")
public class InputBitStreamTest {
@Test
public void testReadAligned() throws IOException {
final byte[] a = { 1 }, A = new byte[1];
new InputBitStream(a).read(A, 8);
assertTrue(Arrays.toString(a) + " != " + Arrays.toString(A), Arrays.equals(a, A));
final byte[] b = { 1, 2 }, B = new byte[2];
new InputBitStream(b).read(B, 16);
assertTrue(Arrays.toString(b) + " != " + Arrays.toString(B), Arrays.equals(b, B));
final byte[] c = { 1, 2, 3 }, C = new byte[3];
new InputBitStream(c).read(C, 24);
assertTrue(Arrays.toString(c) + " != " + Arrays.toString(C), Arrays.equals(c, C));
}
@Test
public void testOverflow() throws IOException {
final InputBitStream ibs = new InputBitStream(new byte[0]);
ibs.readInt(0);
}
@Test
public void testPosition() throws IOException {
final InputBitStream ibs = new InputBitStream(new byte[100]);
for(int i = 0; i < 800; i++) {
ibs.position(i);
assertEquals(i, ibs.position());
}
for(int i = 800; i-- != 0;) {
ibs.position(i);
assertEquals(i, ibs.position());
}
}
@Test
public void readWriteLongs() throws IOException, NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
final Random random = new Random(0);
final File tempFile = File.createTempFile("readWriteLongs", "os");
tempFile.deleteOnExit();
final String[] oneArgs = { "LongGamma", "LongShiftedGamma", "LongDelta", "LongNibble" };
final String[] twoArgsLong = { "LongGolomb", "LongSkewedGolomb" };
final LongArrayList longs = new LongArrayList();
for (int i = 0; i < 10; i++) longs.add(5000000000L + random.nextInt());
//for (int i = 24; i < 60; i++) longs.add(1L << i);
final LongArrayList extraArgLong = new LongArrayList();
for (int i = 0; i < 5; i++) extraArgLong.add(100000 + random.nextInt(1000000));
// Write
final OutputBitStream obs = new OutputBitStream(tempFile);
for (final String methSuffix: oneArgs)
for (final long longValue: longs)
OutputBitStream.class.getMethod("write" + methSuffix, long.class).invoke(obs, Long.valueOf(longValue));
for (final String methSuffix: twoArgsLong)
for (final long longValue: longs)
for (final long longXValue: extraArgLong)
OutputBitStream.class.getMethod("write" + methSuffix, long.class, long.class).invoke(obs, Long.valueOf(longValue), Long.valueOf(longXValue));
// Special methods
for (final long longValue: longs) {
obs.writeLong(longValue, Long.SIZE);
obs.writeLongMinimalBinary(longValue, longValue + 5);
for (int i = 3; i < 10; i++) obs.writeLongZeta(longValue, i);
}
obs.writeLongUnary(15 + 1L << 20);
obs.close();
// Read
final InputBitStream ibs = new InputBitStream(tempFile);
for (final String methSuffix: oneArgs)
for (final long longValue: longs)
assertEquals(Long.valueOf(longValue), InputBitStream.class.getMethod("read" + methSuffix).invoke(ibs));
for (final String methSuffix: twoArgsLong)
for (final long longValue: longs)
for (final long longXValue: extraArgLong)
assertEquals(Long.valueOf(longValue), InputBitStream.class.getMethod("read" + methSuffix, long.class).invoke(ibs, Long.valueOf(longXValue)));
for (final long longValue: longs) {
assertEquals(longValue, ibs.readLong(Long.SIZE));
assertEquals(longValue, ibs.readLongMinimalBinary(longValue + 5));
for (int i = 3; i < 10; i++) assertEquals(longValue, ibs.readLongZeta(i));
}
assertEquals(15 + 1L << 20, ibs.readLongUnary());
ibs.close();
}
@Test
public void testUnary() throws IOException {
final XoRoShiRo128PlusRandom random = new XoRoShiRo128PlusRandom(0);
final FastByteArrayOutputStream fbaos = new FastByteArrayOutputStream();
final OutputBitStream obs = new OutputBitStream(fbaos);
for(int i = 0; i < 100000000; i++) obs.writeUnary(Long.numberOfTrailingZeros(random.nextLong()));
obs.flush();
final InputBitStream ibs = new InputBitStream(fbaos.array);
random.setSeed(0);
for(int i = 0; i < 100000000; i++) assertEquals(Long.numberOfTrailingZeros(random.nextLong()), ibs.readUnary());
}
@Test
public void testLongUnary() throws IOException {
final XoRoShiRo128PlusRandom random = new XoRoShiRo128PlusRandom(0);
final FastByteArrayOutputStream fbaos = new FastByteArrayOutputStream();
final OutputBitStream obs = new OutputBitStream(fbaos);
for(int i = 0; i < 100000000; i++) obs.writeLongUnary(Long.numberOfTrailingZeros(random.nextLong()));
obs.flush();
final InputBitStream ibs = new InputBitStream(fbaos.array);
random.setSeed(0);
for(int i = 0; i < 100000000; i++) assertEquals(Long.numberOfTrailingZeros(random.nextLong()), ibs.readLongUnary());
}
public static void main(final String arg[]) throws IOException {
final XoRoShiRo128PlusRandom random = new XoRoShiRo128PlusRandom(0);
final FastByteArrayOutputStream fbaos = new FastByteArrayOutputStream();
final OutputBitStream obs = new OutputBitStream(fbaos);
for(int i = 0; i < 100000000; i++) obs.writeUnary(Long.numberOfTrailingZeros(random.nextLong()));
obs.flush();
final InputBitStream ibs = new InputBitStream(fbaos.array);
for(int i = 0; i < 100000000; i++) ibs.readUnary();
ibs.position(0);
for(int i = 0; i < 100000000; i++) ibs.readUnary();
ibs.position(0);
for(int i = 0; i < 100000000; i++) ibs.readUnary();
}
}
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