/****************************************************************************
* Copyright (C) 2012 ecsec GmbH.
* All rights reserved.
* Contact: ecsec GmbH (info@ecsec.de)
*
* This file is part of the Open eCard App.
*
* GNU General Public License Usage
* This file may be used under the terms of the GNU General Public
* License version 3.0 as published by the Free Software Foundation
* and appearing in the file LICENSE.GPL included in the packaging of
* this file. Please review the following information to ensure the
* GNU General Public License version 3.0 requirements will be met:
* http://www.gnu.org/copyleft/gpl.html.
*
* Other Usage
* Alternatively, this file may be used in accordance with the terms
* and conditions contained in a signed written agreement between
* you and ecsec GmbH.
*
***************************************************************************/
package org.openecard.common.util;
import java.util.regex.Pattern;
/**
* A set of utility functions for Strings.
*
* @author Moritz Horsch <horsch at cdc.informatik.tu-darmstadt.de>
* @author Tobias Wich <tobias.wich@ecsec.de>
*/
public class StringUtils {
private static final Pattern wsPattern = Pattern.compile("\\s");
/**
* Convert a hex string to a byte array.
*
* @param hex string
* @return Byte array
*/
public static byte[] toByteArray(String hex) {
if ((hex.length() % 2) != 0) {
hex = "0" + hex;
}
byte[] ret = new byte[hex.length() / 2];
for (int i = 0; i < ret.length; i++) {
ret[i] = (byte) Integer.parseInt(hex.substring(i*2, (i*2) + 2), 16);
}
return ret;
}
/**
* Convert a hex string to a byte array.<br/>
* Remove all whitespace characters if flag is set.
*
* @param hex string
* @param removeWhitespace
* @return Byte array
*/
public static byte[] toByteArray(String hex, boolean removeWhitespace) {
if (removeWhitespace) {
hex = wsPattern.matcher(hex).replaceAll("");
}
return toByteArray(hex);
}
}