/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package test;

public class HexTool {

    public static String byteToHex(byte b) {
        String hex = Integer.toHexString(b & 0xFF);
        if (hex.length() < 2) {
            hex = "0" + hex;
        }
        return hex;
    }

    public static String bytesToHex(byte[] bytes) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < bytes.length; i++) {
            String hex = Integer.toHexString(bytes[i] & 0xFF);
            if (hex.length() < 2) {
                sb.append(0);
            }
            sb.append(hex);
        }
        return sb.toString();
    }

    public static byte hexToByte(String inHex) {
        return (byte) Integer.parseInt(inHex, 16);
    }

    public static byte[] hexToByteArray(String inHex) {
        int hexlen = inHex.length();
        byte[] result;
        if (hexlen % 2 == 1) {
            hexlen++;
            result = new byte[(hexlen / 2)];
            inHex = "0" + inHex;
        } else {
            result = new byte[(hexlen / 2)];
        }
        int j = 0;
        for (int i = 0; i < hexlen; i += 2) {
            result[j] = hexToByte(inHex.substring(i, i + 2));
            j++;
        }
        return result;
    }

}