Java Byte Array Create toByteArray(String hexString)

Description

to Byte Array

License

Open Source License

Declaration

public static byte[] toByteArray(String hexString) 

Method Source Code

//package com.java2s;
/*/*w w  w.j a  v a  2 s.com*/
 * Copyright (C) 2002-2006 Stefan Stiller
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

public class Main {
    public static byte[] toByteArray(String hexString) {
        byte[] buffer = new byte[hexString.length() / 2];
        for (int i = 0; i < buffer.length; i++)
            buffer[i] = toByte(hexString.substring(2 * i, 2 * i + 2));
        return buffer;
    }

    public static byte toByte(String hex) {
        char[] lowChar = { '#', '0' };
        char[] highChar = { '#', '0' };

        int start = 0;
        if (hex.startsWith("#"))
            start = 1;
        else if (hex.startsWith("0x"))
            start = 2;

        if (hex.length() > start + 1) {
            lowChar[1] = hex.charAt(start + 1);
            highChar[1] = hex.charAt(start);
        } else if (hex.length() > start) {
            lowChar[1] = hex.charAt(start);
        }

        byte lowByte = Byte.decode(new String(lowChar)).byteValue();
        byte highByte = Byte.decode(new String(highChar)).byteValue();

        return (byte) (lowByte + highByte * 16);
    }
}

Related

1. toByteArray(String hex)
2. toByteArray(String hex)
3. toByteArray(String hex)
4. toByteArray(String hex)
5. toByteArray(String hexStr)
6. toByteArray(String hexString)
7. toByteArray(String hexString)
8. toByteArray(String map)
9. toByteArray(String s)