Java Byte Array Create toByteArray(String hex)

Description

Returns a byte array from a String containing hex encoding bytes.

License

Open Source License

Declaration

public static byte[] toByteArray(String hex) 

Method Source Code

//package com.java2s;
/**/*from  w  w  w.ja  v  a2s . c o  m*/
 * Copyright 2001-2014 CryptoHeaven Corp. All Rights Reserved.
 *
 * This software is the confidential and proprietary information
 * of CryptoHeaven Corp. ("Confidential Information").  You
 * shall not disclose such Confidential Information and shall use
 * it only in accordance with the terms of the license agreement
 * you entered into with CryptoHeaven Corp.
 */

public class Main {
    /** data for hexadecimal visualisation. */
    private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
            'E', 'F' };

    /**
    * Returns a byte array from a String containing hex encoding bytes.
    */
    public static byte[] toByteArray(String hex) {
        byte[] bytes = null;
        if (hex != null) {
            bytes = new byte[hex.length() / 2];
            for (int i = 0; i < hex.length(); i += 2) {
                char ch1 = hex.charAt(i);
                char ch2 = hex.charAt(i + 1);
                bytes[i / 2] = (byte) hexCharsToByte(ch1, ch2);
            }
        }
        return bytes;
    }

    public static int hexCharsToByte(char hexDigit1, char hexDigit2) {
        int b1 = 0;
        int b2 = 0;
        char ch1 = hexDigit1;
        char ch2 = hexDigit2;
        if (ch1 >= HEX_DIGITS[0] && ch1 <= HEX_DIGITS[9]) {
            b1 = (int) (ch1 - HEX_DIGITS[0]);
        } else {
            b1 = (int) (ch1 - HEX_DIGITS[10] + 10);
        }
        if (ch2 >= HEX_DIGITS[0] && ch2 <= HEX_DIGITS[9]) {
            b2 = (int) (ch2 - HEX_DIGITS[0]);
        } else {
            b2 = (int) (ch2 - HEX_DIGITS[10] + 10);
        }
        return (int) ((b1 << 4) | b2);
    }
}

Related

1. toByteArray(String address)
2. toByteArray(String binString)
3. toByteArray(String bytesStr, int byteLength)
4. toByteArray(String content, String charsetName)
5. toByteArray(String hex)
6. toByteArray(String hex)
7. toByteArray(String hex)
8. toByteArray(String hexStr)
9. toByteArray(String hexString)