Java String to Byte Array asBytes(String hex)

Description

as Bytes

License

Open Source License

Declaration

public static byte[] asBytes(String hex) 

Method Source Code

//package com.java2s;
/*// w w  w  .  j  a  va2s .co m
 *
 * Enginuity Open-Source Tuning, Logging and Reflashing
 * Copyright (C) 2006 Enginuity.org
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

public class Main {
    public static byte[] asBytes(String hex) {
        if (hex.indexOf(' ') >= 0) {
            hex = hex.replaceAll(" ", "");
        }
        if (hex.startsWith("0x")) {
            hex = hex.substring(2);
        }
        return hexToBytes(hex);
    }

    public static byte[] hexToBytes(String s) {
        return hexToBytes(s, 0);
    }

    public static byte[] hexToBytes(String s, int off) {
        byte[] bs = new byte[off + (1 + s.length()) / 2];
        hexToBytes(s, bs, off);
        return bs;
    }

    public static void hexToBytes(String s, byte[] out, int off)
            throws NumberFormatException, IndexOutOfBoundsException {
        int slen = s.length();
        if ((slen % 2) != 0) {
            s = '0' + s;
        }
        if (out.length < off + slen / 2) {
            throw new IndexOutOfBoundsException(
                    "Output buffer too small for input (" + out.length + "<" + off + slen / 2 + ")");
        }
        // Safe to assume the string is even length
        byte b1, b2;
        for (int i = 0; i < slen; i += 2) {
            b1 = (byte) Character.digit(s.charAt(i), 16);
            b2 = (byte) Character.digit(s.charAt(i + 1), 16);
            if ((b1 < 0) || (b2 < 0)) {
                throw new NumberFormatException();
            }
            out[off + i / 2] = (byte) (b1 << 4 | b2);
        }
    }
}

Related

1. asBytes(String basicString)
2. asBytes(String hexStr)
3. convertStringToByte(String input)
4. convertStringToByte(String strValue)
5. convertStringToByteArray(String input)