test.it.unimi.dsi.bits.RawByteArrayTransformationStrategyTest Maven / Gradle / Ivy

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package it.unimi.dsi.bits;

/*
 * DSI utilities
 *
 * Copyright (C) 2010-2017 Sebastiano Vigna
 *
 *  This library is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by the Free
 *  Software Foundation; either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  This library 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.  See the GNU Lesser General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, see .
 *
 */

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

public class RawByteArrayTransformationStrategyTest {

	@Test
	public void testGetLong() {
		byte[] a = new byte[] { 0x55, (byte)0xFF };
		assertEquals(16, TransformationStrategies.rawByteArray().toBitVector(a).length());
		assertEquals(0xFF55L, TransformationStrategies.rawByteArray().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 };
		assertTrue(TransformationStrategies.rawByteArray().toBitVector(a).getBoolean(0));
		assertFalse(TransformationStrategies.rawByteArray().toBitVector(a).getBoolean(1));
		assertTrue(TransformationStrategies.rawByteArray().toBitVector(a).getBoolean(64));
		assertEquals(0x1L, TransformationStrategies.rawByteArray().toBitVector(a).getLong(0, 56));
		assertEquals(0x1L, TransformationStrategies.rawByteArray().toBitVector(a).getLong(0, 64));
		assertEquals(-1L, TransformationStrategies.rawByteArray().toBitVector(a).getLong(64, 128));

		for(int i = 1; i < 64; i++)
			assertEquals(1, TransformationStrategies.rawByteArray().toBitVector(a).getLong(0, i));
		for(int i = 0; i < 63; i++)
			assertEquals(0, TransformationStrategies.rawByteArray().toBitVector(a).getLong(1, 1 + i));
		for(int i = 64; i < 127; i++)
			assertEquals((1L << i - 64) - 1, TransformationStrategies.rawByteArray().toBitVector(a).getLong(64, i));

		a = new byte[] { 1, 0, 0, 0, 0, 0, 0, 0, 0x55 };
		assertEquals(0x55L << 57, TransformationStrategies.rawByteArray().toBitVector(a).getLong(7, 71));
		assertEquals(0x15L << 57, TransformationStrategies.rawByteArray().toBitVector(a).getLong(7, 70));
		assertEquals(0x15L << 57, TransformationStrategies.rawByteArray().toBitVector(a).getLong(7, 69));

	}

}