001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.config.plugins.convert;
018
019/**
020 * Converts Strings to hex. This is used in place of java.xml.bind.DataTypeConverter which is not available by
021 * default in Java 9.
022 *
023 * @Since 2.9
024 */
025public class HexConverter {
026
027    public static byte[] parseHexBinary(final String s) {
028        final int len = s.length();
029        final byte[] data = new byte[len / 2];
030        for (int i = 0; i < len; i += 2) {
031            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
032                    + Character.digit(s.charAt(i+1), 16));
033        }
034        return data;
035    }
036}