ByteCompressionUtils.java

/*
 * ProActive Parallel Suite(TM):
 * The Open Source library for parallel and distributed
 * Workflows & Scheduling, Orchestration, Cloud Automation
 * and Big Data Analysis on Enterprise Grids & Clouds.
 *
 * Copyright (c) 2007 - 2017 ActiveEon
 * Contact: contact@activeeon.com
 *
 * This library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation: version 3 of
 * the License.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * If needed, contact us to obtain a release under GPL Version 2 or 3
 * or a different license than the AGPL.
 */
package org.ow2.proactive.scheduler.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;

import org.apache.log4j.Logger;


/**
 * 
 * @author ActiveEon team
 *
 */
public class ByteCompressionUtils {
    private static final Logger LOG = Logger.getLogger(ByteCompressionUtils.class);

    private ByteCompressionUtils() {
    }

    public static byte[] compress(byte[] data) throws IOException {
        Deflater deflater = new Deflater();
        deflater.setInput(data);

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream(data.length);

        deflater.finish();
        byte[] buffer = new byte[1024];
        while (!deflater.finished()) {
            int count = deflater.deflate(buffer); // returns the generated code... index  
            outputStream.write(buffer, 0, count);
        }
        outputStream.close();
        byte[] output = outputStream.toByteArray();

        deflater.end();

        LOG.debug("Original: " + data.length / 1024 + " Kb");
        LOG.debug("Compressed: " + output.length / 1024 + " Kb");
        return output;
    }

    public static byte[] decompress(byte[] data) throws IOException, DataFormatException {
        Inflater inflater = new Inflater();
        inflater.setInput(data);

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream(data.length);
        byte[] buffer = new byte[1024];
        while (!inflater.finished()) {
            int count = inflater.inflate(buffer);
            outputStream.write(buffer, 0, count);
        }
        outputStream.close();
        byte[] output = outputStream.toByteArray();

        inflater.end();

        LOG.debug("Original: " + data.length);
        LOG.debug("Uncompressed: " + output.length);
        return output;
    }
}