/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2014, Telestax Inc and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
package org.restcomm.connect.commons.util;

import org.restcomm.connect.commons.annotations.concurrency.ThreadSafe;

/**
 * @author quintana.thomas@gmail.com (Thomas Quintana)
 */
@ThreadSafe
public final class HexadecimalUtils {
    private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

    private HexadecimalUtils() {
        super();
    }

    public static char[] toHex(final byte[] input) {
        int position = 0;
        char[] characters = new char[input.length * 2];
        for (int index = 0; index < input.length; index++) {
            characters[position++] = HEX_DIGITS[(input[index] >> 4) & 0x0F];
            characters[position++] = HEX_DIGITS[input[index] & 0x0f];
        }
        return characters;
    }

    public static String toHex(final String input) {
        return new String(toHex(input.getBytes()));
    }
}
