DeflateUtilities.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


package org.openspcoop2.utils.io;

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

import org.openspcoop2.utils.UtilsException;

/** 
 * DeflateUtilities
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class DeflateUtilities {

    private static final int BUFFER_SIZE = 1024;

    public static byte[] decode(String data) throws UtilsException{
        return decode(data.getBytes());
    }
    public static byte[] decode(byte[] data) throws UtilsException{
        ByteArrayOutputStream baos = null;

        try {
            Deflater d = new Deflater(Deflater.BEST_COMPRESSION);
            d.setInput(data);
            d.finish();
    
            byte[] bytesCompressed = new byte[BUFFER_SIZE];
    
            int deflate = d.deflate(bytesCompressed);
            baos = new ByteArrayOutputStream();
    
            while(deflate > 0) {
                baos.write(bytesCompressed, 0 ,deflate);
                deflate = d.deflate(bytesCompressed);
            }
    
            return baos.toByteArray();
        } finally {
            if(baos != null) {
                try {baos.flush();} catch(Exception e) {}
                try {baos.close();} catch(Exception e) {}
            }
        }

    }

    public static byte[] encode(byte [] data) throws UtilsException{
        ByteArrayOutputStream baos = null;
        try {
            Inflater inflater = new Inflater();
            inflater.setInput(data);
            byte[] result = new byte[BUFFER_SIZE];
            int inflate = inflater.inflate(result);
            baos = new ByteArrayOutputStream();
            while(inflate > 0) {
                baos.write(result, 0, inflate);
                inflate = inflater.inflate(result);
            }
            inflater.end();
            return baos.toByteArray();
        } catch (DataFormatException e) {
            throw new UtilsException(e);
        } finally {
            if(baos != null) {
                try {baos.flush();} catch(Exception e) {}
                try {baos.close();} catch(Exception e) {}
            }
        }
    }
    
    public static String encodeAsString(byte [] data) throws UtilsException{
        return new String(encode(data));
    }

}