jp.co.nemuzuka.utils.BinaryHexConverter.java Source code

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Here is the source code for jp.co.nemuzuka.utils.BinaryHexConverter.java

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/*
 * Copyright 2012 Kazumune Katagiri. (http://d.hatena.ne.jp/nemuzuka)
 *
 * Licensed 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 jp.co.nemuzuka.utils;

import org.apache.commons.lang.StringUtils;

/**
 * 16?Utils.
 * @author k-katagiri
 */
public class BinaryHexConverter {

    /**
     * byte??16???
     * @param fromByte ?Byte?
     * @return 16???(?byte??null???null)
     */
    public static String bytesToHexString(byte[] fromByte) {

        if (fromByte == null) {
            return null;
        }

        StringBuilder hexStrBuilder = new StringBuilder();

        for (int i = 0; i < fromByte.length; i++) {
            // 16?1??????2?0??
            if ((fromByte[i] & 0xff) < 0x10) {
                hexStrBuilder.append("0");
            }
            hexStrBuilder.append(Integer.toHexString(0xff & fromByte[i]).toUpperCase());
        }
        return hexStrBuilder.toString();
    }

    /**
     * 16?Byte????
     * @param fromHexStr ??16
     * @return ??Byte?(??16?null????null)
     */
    public static byte[] hexStringToBytes(String fromHexStr) {

        if (StringUtils.isEmpty(fromHexStr)) {
            return null;
        }

        //16??2?1??????
        //Byte???????????1/2??
        byte[] toByte = new byte[fromHexStr.length() / 2];

        //16?2??Byte???????
        for (int i = 0; i < toByte.length; i++) {
            toByte[i] = (byte) Integer.parseInt(fromHexStr.substring(i * 2, (i + 1) * 2), 16);
        }
        return toByte;
    }
}