RLEDecoderTest.java

/*
 * Copyright (c) 2021, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 */

package com.twelvemonkeys.imageio.plugins.tga;

import com.twelvemonkeys.io.enc.Decoder;
import com.twelvemonkeys.io.enc.DecoderAbstractTest;
import com.twelvemonkeys.io.enc.Encoder;

import org.junit.jupiter.api.Test;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Arrays;

import static org.junit.jupiter.api.Assertions.*;

/**
 * RLEDecoderTest.
 *
 * @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
 * @author last modified by $Author: haraldk$
 * @version $Id: RLEDecoderTest.java,v 1.0 07/04/2021 haraldk Exp$
 */
public class RLEDecoderTest extends DecoderAbstractTest {
    public Decoder createDecoder() {
        return new RLEDecoder(8);
    }

    public Encoder createCompatibleEncoder() {
        return new RLEEncoder(8);
    }

    @Test
    public void testRLE8() throws IOException {
        RLEDecoder decoder = new RLEDecoder(8);

        ByteBuffer buffer = ByteBuffer.allocate(256);
        // Literal run, 2 bytes, compressed run, 8 bytes
        ByteArrayInputStream stream = new ByteArrayInputStream(new byte[] {1, (byte) 0xFF, (byte) 0xF1, (byte) 0x87, (byte) 0xFE});

        int decoded = decoder.decode(stream, buffer);

        assertEquals(10, decoded);
        assertArrayEquals(new byte[] {(byte) 0xFF, (byte) 0xF1, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE}, Arrays.copyOf(buffer.array(), 10));
    }

    @Test
    public void testRLE16() throws IOException {
        RLEDecoder decoder = new RLEDecoder(16);

        ByteBuffer buffer = ByteBuffer.allocate(512);
        // Literal run, 2 * 2 bytes, compressed run, 8 * 2 bytes
        ByteArrayInputStream stream = new ByteArrayInputStream(new byte[] {1, (byte) 0x00, (byte) 0xFF, (byte) 0x00, (byte) 0xF1, (byte) 0x87, (byte) 0x00, (byte) 0xFE});

        int decoded = decoder.decode(stream, buffer);

        assertEquals(20, decoded);
        assertArrayEquals(new byte[] {
                        (byte) 0x00, (byte) 0xFF, (byte) 0x00, (byte) 0xF1,
                        (byte) 0x00, (byte) 0xFE,  (byte) 0x00, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE,  (byte) 0x00, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE,  (byte) 0x00, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE,  (byte) 0x00, (byte) 0xFE
                },
                Arrays.copyOf(buffer.array(), 20));
    }

    @Test
    public void testRLE24() throws IOException {
        RLEDecoder decoder = new RLEDecoder(24);

        ByteBuffer buffer = ByteBuffer.allocate(1024);
        // Literal run, 2 * 3 bytes, compressed run, 8 * 3 bytes
        ByteArrayInputStream stream = new ByteArrayInputStream(new byte[] {1, (byte) 0x00, (byte) 0xFF, (byte) 0xFF, (byte) 0x00, (byte) 0xF1, (byte) 0xF1, (byte) 0x87, (byte) 0x00, (byte) 0xFE, (byte) 0xFE});

        int decoded = decoder.decode(stream, buffer);

        assertEquals(30, decoded);
        assertArrayEquals(new byte[] {
                        (byte) 0x00, (byte) 0xFF, (byte) 0xFF,  (byte) 0x00, (byte) 0xF1, (byte) 0xF1,
                        (byte) 0x00, (byte) 0xFE,  (byte) 0xFE, (byte) 0x00, (byte) 0xFE, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE,  (byte) 0xFE, (byte) 0x00, (byte) 0xFE, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE,  (byte) 0xFE, (byte) 0x00, (byte) 0xFE, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE,  (byte) 0xFE, (byte) 0x00, (byte) 0xFE, (byte) 0xFE
                },
                Arrays.copyOf(buffer.array(), 30));
    }

    @Test
    public void testRLE32() throws IOException {
        RLEDecoder decoder = new RLEDecoder(32);

        ByteBuffer buffer = ByteBuffer.allocate(1024);
        // Literal run, 2 * 4 bytes, compressed run, 8 * 4 bytes
        ByteArrayInputStream stream = new ByteArrayInputStream(new byte[] {1, (byte) 0x00, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0x00, (byte) 0xF1, (byte) 0xF1, (byte) 0xF1, (byte) 0x87, (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE});

        int decoded = decoder.decode(stream, buffer);

        assertEquals(40, decoded);
        assertArrayEquals(new byte[] {
                        (byte) 0x00, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0x00, (byte) 0xF1, (byte) 0xF1, (byte) 0xF1,
                        (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE,
                        (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE, (byte) 0x00, (byte) 0xFE, (byte) 0xFE, (byte) 0xFE
                },
                Arrays.copyOf(buffer.array(), 40));
    }

}