/**
* Copyright (c) 2009--2010 Red Hat, Inc.
*
* This software is licensed to you under the GNU General Public License,
* version 2 (GPLv2). There is NO WARRANTY for this software, express or
* implied, including the implied warranties of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
* along with this software; if not, see
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* Red Hat trademarks are not licensed under GPLv2. No permission is
* granted to use or replicate Red Hat trademarks that are incorporated
* in this software or its documentation.
*/
package com.redhat.rhn.common.util;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
/**
*
* CompressionUtil
* @version $Rev$
*/
public class CompressionUtil {
private CompressionUtil() {
}
/**
* Gzip compress a string
* @param string the string to compress
* @return the compressed data
*/
public static byte[] gzipCompress(String string) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
try {
GZIPOutputStream gz = new GZIPOutputStream(stream);
BufferedOutputStream bufos = new BufferedOutputStream(gz, 5000000);
bufos.write(string.getBytes());
bufos.flush();
bufos.close();
return stream.toByteArray();
}
catch (IOException e) {
return null;
}
}
/**
* unzip some gzip compressed data
* @param bytes the data to uncompress
* @return the uncompressed data
*/
public static String gzipDecompress(byte[] bytes) {
ByteArrayInputStream stream = new ByteArrayInputStream(bytes);
try {
GZIPInputStream gs = new GZIPInputStream(stream);
BufferedInputStream bufis = new BufferedInputStream(gs);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int len;
while ((len = bufis.read(buf)) > 0) {
bos.write(buf, 0, len);
}
return bos.toString();
}
catch (IOException e) {
return null;
}
}
}