src/test/java/org/apache/pdfbox/jbig2/decoder/mmr/MMRDecompressorTest.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.pdfbox.jbig2.decoder.mmr;

import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.stream.ImageInputStream;

import org.apache.pdfbox.jbig2.Bitmap;
import org.apache.pdfbox.jbig2.err.InvalidHeaderValueException;
import org.apache.pdfbox.jbig2.io.DefaultInputStreamFactory;
import org.apache.pdfbox.jbig2.io.SubInputStream;
import org.junit.Test;

public class MMRDecompressorTest
{

    @Test
    public void mmrDecodingTest() throws IOException, InvalidHeaderValueException
    {
        final byte[] expected = new byte[] { 0, 0, 2, 34, 38, 102, -17, -1, 2, 102, 102, //
                -18, -18, -17, -1, -1, 0, 2, 102, 102, 127, //
                -1, -1, -1, 0, 0, 0, 4, 68, 102, 102, 127 };
        final Bitmap expectedBitmap = new Bitmap(16 * 4, 4);
        for(int i = 0; i < expected.length; i++ )
        {
            expectedBitmap.setByte(i, expected[i]);
        }

        final File inputFile = new File("target/images/sampledata.jb2");
        // skip test if input stream isn't available
        assumeTrue(inputFile.exists());

        final InputStream inputStream = new FileInputStream(inputFile);

        final DefaultInputStreamFactory disf = new DefaultInputStreamFactory();
        final ImageInputStream iis = disf.getInputStream(inputStream);

        // Sixth Segment (number 5)
        final SubInputStream sis = new SubInputStream(iis, 252, 38);

        final MMRDecompressor mmrd = new MMRDecompressor(16 * 4, 4, sis);

        final Bitmap b = mmrd.uncompress();

        assertTrue(expectedBitmap.equals(b));
    }
}