source: trunk/src/main/java/omq/common/util/Zipper.java

package omq.common.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

/**
 * This class enables the compression of the information sent through the
 * rabbitmq server.
 * 
 * @author Sergi Toda <sergi.toda@estudiants.urv.cat>
 * 
 */
public class Zipper {

        public static byte[] zip(byte[] b) throws IOException {
                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                GZIPOutputStream zos = null;
                try {
                        zos = new GZIPOutputStream(baos);
                        zos.write(b);
                } finally {
                        if (zos != null) {
                                zos.close();
                        }

                        baos.close();
                }

                return baos.toByteArray();
        }

        public static byte[] unzip(byte[] b) throws IOException {
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ByteArrayInputStream bais = new ByteArrayInputStream(b);

                GZIPInputStream zis = null;
                try {
                        zis = new GZIPInputStream(bais);

                        byte[] tmpBuffer = new byte[256];
                        int n;
                        while ((n = zis.read(tmpBuffer)) >= 0) {
                                baos.write(tmpBuffer, 0, n);
                        }
                } finally {
                        if (zis != null) {
                                zis.close();
                        }

                        bais.close();
                        baos.close();
                }

                return baos.toByteArray();
        }
}