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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.bits;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
public class ByteArrayTransformationStrategyTest {
@Test
public void testGetLong() {
byte[] a = new byte[] { 0x55, (byte)0xFF };
assertEquals(16, TransformationStrategies.byteArray().toBitVector(a).length());
assertEquals(0xFFAAL, TransformationStrategies.byteArray().toBitVector(a).getLong(0, 16));
a = new byte[] { 1, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -1, -1, -1, 0 };
assertFalse(TransformationStrategies.byteArray().toBitVector(a).getBoolean(0));
assertFalse(TransformationStrategies.byteArray().toBitVector(a).getBoolean(1));
assertTrue(TransformationStrategies.byteArray().toBitVector(a).getBoolean(7));
assertTrue(TransformationStrategies.byteArray().toBitVector(a).getBoolean(64));
assertEquals(128, TransformationStrategies.byteArray().toBitVector(a).getLong(0, 56));
assertEquals(128, TransformationStrategies.byteArray().toBitVector(a).getLong(0, 64));
assertEquals(0xF000000000000008L, TransformationStrategies.byteArray().toBitVector(a).getLong(4, 68));
assertEquals(-1L, TransformationStrategies.byteArray().toBitVector(a).getLong(64, 128));
assertEquals(0, TransformationStrategies.byteArray().toBitVector(a).getLong(128, 136));
for(int i = 1; i < 7; i++)
assertEquals(0, TransformationStrategies.byteArray().toBitVector(a).getLong(0, i));
for(int i = 8; i < 63; i++)
assertEquals(128, TransformationStrategies.byteArray().toBitVector(a).getLong(0, i));
}
@Test
public void testGetLongPrefixFree() {
byte[] a = new byte[] { 0x55, (byte)0xFF };
assertEquals(24, TransformationStrategies.prefixFreeByteArray().toBitVector(a).length());
assertEquals(0x00FFAAL, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(0, 24));
a = new byte[] { 1, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -1, -1, -1, 0 };
assertFalse(TransformationStrategies.prefixFreeByteArray().toBitVector(a).getBoolean(0));
assertFalse(TransformationStrategies.prefixFreeByteArray().toBitVector(a).getBoolean(1));
assertTrue(TransformationStrategies.prefixFreeByteArray().toBitVector(a).getBoolean(7));
assertTrue(TransformationStrategies.prefixFreeByteArray().toBitVector(a).getBoolean(64));
assertEquals(128, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(0, 56));
assertEquals(128, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(0, 64));
assertEquals(0xF000000000000008L, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(4, 68));
assertEquals(-1L, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(64, 128));
assertEquals(0, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(128, 136));
assertEquals(0, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(136, 144));
for (int i = 1; i < 7; i++) assertEquals(0, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(0, i));
for (int i = 8; i < 63; i++) assertEquals(128, TransformationStrategies.prefixFreeByteArray().toBitVector(a).getLong(0, i));
}
}
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