BZip2TestCase.java

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 * 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,
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package org.apache.commons.compress.compressors;

import static org.junit.Assert.*;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.compress.AbstractTestCase;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.utils.IOUtils;
import org.junit.Test;

public final class BZip2TestCase extends AbstractTestCase {

    @Test
    public void testBzipCreation()  throws Exception {
        File output = null;
        final File input = getFile("test.txt");
        {
            output = new File(dir, "test.txt.bz2");
            final OutputStream out = new FileOutputStream(output);
            final CompressorOutputStream cos = new CompressorStreamFactory().createCompressorOutputStream("bzip2", out);
            final FileInputStream in = new FileInputStream(input);
            IOUtils.copy(in, cos);
            cos.close();
            in.close();
        }

        final File decompressed = new File(dir, "decompressed.txt");
        {
            final File toDecompress = output;
            final InputStream is = new FileInputStream(toDecompress);
            final CompressorInputStream in =
                new CompressorStreamFactory().createCompressorInputStream("bzip2", is);
            final FileOutputStream os = new FileOutputStream(decompressed);
            IOUtils.copy(in, os);
            is.close();
            os.close();
        }

        assertEquals(input.length(),decompressed.length());
    }

    @Test
    public void testBzip2Unarchive() throws Exception {
        final File input = getFile("bla.txt.bz2");
        final File output = new File(dir, "bla.txt");
        final InputStream is = new FileInputStream(input);
        final CompressorInputStream in = new CompressorStreamFactory().createCompressorInputStream("bzip2", is);
        final FileOutputStream os = new FileOutputStream(output);
        IOUtils.copy(in, os);
        is.close();
        os.close();
    }

    @Test
    public void testConcatenatedStreamsReadFirstOnly() throws Exception {
        final File input = getFile("multiple.bz2");
        try (InputStream is = new FileInputStream(input)) {
            try (CompressorInputStream in = new CompressorStreamFactory()
                    .createCompressorInputStream("bzip2", is)) {
                assertEquals('a', in.read());
                assertEquals(-1, in.read());
            }
        }
    }

    @Test
    public void testConcatenatedStreamsReadFully() throws Exception {
        final File input = getFile("multiple.bz2");
        try (InputStream is = new FileInputStream(input)) {
            try (CompressorInputStream in = new BZip2CompressorInputStream(is, true)) {
                assertEquals('a', in.read());
                assertEquals('b', in.read());
                assertEquals(0, in.available());
                assertEquals(-1, in.read());
            }
        }
    }

    @Test
    public void testCOMPRESS131() throws Exception {
        final File input = getFile("COMPRESS-131.bz2");
        try (InputStream is = new FileInputStream(input)) {
            try (CompressorInputStream in = new BZip2CompressorInputStream(is, true)) {
                int l = 0;
                while (in.read() != -1) {
                    l++;
                }
                assertEquals(539, l);
            }
        }
    }

}