org.ojbc.util.helper.ZipUtils.java Source code

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Here is the source code for org.ojbc.util.helper.ZipUtils.java

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/*
 * Unless explicitly acquired and licensed from Licensor under another license, the contents of
 * this file are subject to the Reciprocal Public License ("RPL") Version 1.5, or subsequent
 * versions as allowed by the RPL, and You may not copy or use this file in either source code
 * or executable form, except in compliance with the terms and conditions of the RPL
 *
 * All software distributed under the RPL is provided strictly on an "AS IS" basis, WITHOUT
 * WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, AND LICENSOR HEREBY DISCLAIMS ALL SUCH
 * WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, QUIET ENJOYMENT, OR NON-INFRINGEMENT. See the RPL for specific language
 * governing rights and limitations under the RPL.
 *
 * http://opensource.org/licenses/RPL-1.5
 *
 * Copyright 2012-2015 Open Justice Broker Consortium
 */
package org.ojbc.util.helper;

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.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Zip Utility class. 
 * 
 * This class provides assistance with Zip/Unzip byte[] objects.
 */
public class ZipUtils {
    private static final Log log = LogFactory.getLog(ZipUtils.class);

    public static byte[] zip(byte[] originalData) {
        Deflater compressor = new Deflater();
        compressor.setLevel(Deflater.BEST_COMPRESSION);
        compressor.setInput(originalData);
        compressor.finish();

        ByteArrayOutputStream bos = new ByteArrayOutputStream(originalData.length);

        byte[] buf = new byte[1024];
        while (!compressor.finished()) {
            int count = compressor.deflate(buf);
            bos.write(buf, 0, count);
        }

        try {
            bos.close();
        } catch (IOException e) {
            log.error("Failed to zip data " + originalData, e);
        }
        byte[] compressedData = bos.toByteArray();

        log.debug("Orignal data:" + originalData.length + " bytes");
        log.debug("Compressed data:" + compressedData.length + " bytes");
        return compressedData;
    }

    public static byte[] unzip(byte[] data) {
        Inflater inflater = new Inflater();
        inflater.setInput(data);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream(data.length);
        byte[] buffer = new byte[1024];
        try {
            while (!inflater.finished()) {
                int count;
                count = inflater.inflate(buffer);
                outputStream.write(buffer, 0, count);
            }
            outputStream.close();
        } catch (Exception e) {
            log.error("Failed to unzip data", e);
        }

        byte[] output = outputStream.toByteArray();
        log.debug("Original: " + data.length + " bytes");
        log.debug("Decompressed: " + output.length + " bytes");
        return output;
    }

}