JavaFastPFOR/src/test/java/me/lemire/integercompression/ByteBasicTest.java at 7283fe0bbd87e5aff391d7ac7aecf5e9c55245a1 · PHJ2000/JavaFastPFOR · GitHub

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/**
 * This code is released under the
 * Apache License Version 2.0 http://www.apache.org/licenses/.
 *
 * (c) Daniel Lemire, http://lemire.me/en/
 */

package me.lemire.integercompression;

import java.util.Arrays;

import me.lemire.integercompression.differential.IntegratedVariableByte;

import org.junit.Test;

import static org.junit.Assert.*;


/**
 * Just some basic sanity tests.
 *
 * @author Daniel Lemire
 */
@SuppressWarnings({ "static-method" })
public class ByteBasicTest {
    ByteIntegerCODEC[] codecs = {
            new VariableByte(),
            new IntegratedVariableByte(),
         };

    /**
     *
     */
    @Test
    public void saulTest() {
        for (ByteIntegerCODEC C : codecs) {
            for (int x = 0; x < 50 * 4; ++x) {
                int[] a = { 2, 3, 4, 5 };
                byte[] b = new byte[90*4];
                int[] c = new int[a.length];

                IntWrapper aOffset = new IntWrapper(0);
                IntWrapper bOffset = new IntWrapper(x);
                C.compress(a, aOffset, a.length, b, bOffset);
                int len = bOffset.get() - x;

                bOffset.set(x);
                IntWrapper cOffset = new IntWrapper(0);
                C.uncompress(b, bOffset, len, c, cOffset);
                if(!Arrays.equals(a, c)) {
                    System.out.println("Problem with "+C);
                }
                assertArrayEquals(a, c);
                assertEquals(C.toString(), x + len, bOffset.get());
                assertEquals(C.toString(), a.length, cOffset.get());
            }
        }
    }
    @Test
    public void emptyInputPreservesOffsets() {
        for (ByteIntegerCODEC codec : codecs) {
            IntWrapper inpos = new IntWrapper(5);
            IntWrapper outpos = new IntWrapper(2);
            int[] output = { 10, 20, 30 };

            codec.uncompress(new byte[5], inpos, 0, output, outpos);

            assertEquals(codec.toString(), 5, inpos.get());
            assertEquals(codec.toString(), 2, outpos.get());
            assertArrayEquals(new int[] { 10, 20, 30 }, output);
        }
    }

    /**
     *
     */
    @Test
    public void varyingLengthTest() {
        int N = 4096;
        int[] data = new int[N];
        for (int k = 0; k < N; ++k)
            data[k] = k;
        for (ByteIntegerCODEC c : codecs) {
            for (int L = 1; L <= 128; L++) {
                byte[] comp = TestUtils.compress(c, Arrays.copyOf(data, L));
                int[] answer = TestUtils.uncompress(c, comp, L);
                for (int k = 0; k < L; ++k)
                    if (answer[k] != data[k])
                        throw new RuntimeException("bug "+c.toString()+" "+k+" "+answer[k]+" "+data[k]);
            }
            for (int L = 128; L <= N; L *= 2) {
                byte[] comp = TestUtils.compress(c, Arrays.copyOf(data, L));
                int[] answer = TestUtils.uncompress(c, comp, L);
                for (int k = 0; k < L; ++k)
                    if (answer[k] != data[k])
                        throw new RuntimeException("bug");
            }

        }
    }

    /**
     *
     */
    @Test
    public void varyingLengthTest2() {
        int N = 128;
        int[] data = new int[N];
        data[127] = -1;
        for (ByteIntegerCODEC c : codecs) {
            try {
                // CODEC Simple9 is limited to "small" integers.
                if (c.getClass().equals(
                        Class.forName("me.lemire.integercompression.Simple9")))
                    continue;
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
            for (int L = 1; L <= 128; L++) {
                byte[] comp = TestUtils.compress(c, Arrays.copyOf(data, L));
                int[] answer = TestUtils.uncompress(c, comp, L);
                for (int k = 0; k < L; ++k)
                    if (answer[k] != data[k])
                        throw new RuntimeException("bug at k = "+k+" "+answer[k]+" "+data[k]);
            }
            for (int L = 128; L <= N; L *= 2) {
                byte[] comp = TestUtils.compress(c, Arrays.copyOf(data, L));
                int[] answer = TestUtils.uncompress(c, comp, L);
                for (int k = 0; k < L; ++k)
                    if (answer[k] != data[k])
                        throw new RuntimeException("bug");
            }

        }
    }


}