Java Convert via ByteBuffer hexDump(byte... b)

Description

Returns the hex dump of the given byte array as 16 bytes per line

License

Open Source License

Parameter

Parameter	Description
b	the byte array

Return

A string with the hex dump

Declaration

public static String hexDump(byte... b) 

Method Source Code

//package com.java2s;
/*//  w  w  w .ja  v  a  2  s .  co  m
 * This file is part of l2jserver2 <l2jserver2.com>.
 *
 * l2jserver2 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 3 of the License, or
 * (at your option) any later version.
 *
 * l2jserver2 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 l2jserver2.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.nio.ByteBuffer;

public class Main {
    /**
     * Returns the hex dump of the given byte array as 16 bytes per line
     * 
     * @param b
     *            the byte array
     * @return A string with the hex dump
     */
    public static String hexDump(byte... b) {
        if (b == null)
            return "";
        StringBuffer buf = new StringBuffer();
        int size = b.length;
        for (int i = 0; i < size; i++) {
            if ((i + 1) % 16 == 0) {
                buf.append(zeropad(Integer.toHexString(byteToUInt(b[i])).toUpperCase(), 2));
                buf.append('\n');
            } else {
                buf.append(zeropad(Integer.toHexString(byteToUInt(b[i])).toUpperCase(), 2));
                buf.append(" ");
            }
        }
        return buf.toString();
    }

    /**
     * Returns the hex dump of the given byte array as 16 bytes per line
     * 
     * @param buffer
     *            the byte buffer
     * @return A string with the hex dump
     */
    public static String hexDump(ByteBuffer buffer) {
        if (buffer == null)
            return "";
        StringBuffer buf = new StringBuffer();
        int size = buffer.remaining();
        for (int i = 0; i < size; i++) {
            if ((i + 1) % 16 == 0) {
                buf.append(zeropad(Integer.toHexString(byteToUInt(buffer.get(buffer.position() + i))).toUpperCase(),
                        2));
                buf.append('\n');
            } else {
                buf.append(zeropad(Integer.toHexString(byteToUInt(buffer.get(buffer.position() + i))).toUpperCase(),
                        2));
                buf.append(" ");
            }
        }
        return buf.toString();
    }

    public static String zeropad(String number, int size) {
        if (number.length() >= size)
            return number;
        return repeat("0", size - number.length()) + number;
    }

    /**
     * Returns the unsigned value of a byte
     * 
     * @param the
     *            byte witch u want to convert
     */
    public static int byteToUInt(byte b) {
        return b & 0xFF;
    }

    public static String repeat(String str, int repeat) {
        StringBuffer buf = new StringBuffer();

        for (int i = 0; i < repeat; i++)
            buf.append(str);

        return buf.toString();
    }
}

Related

1. hexDump(byte[] buffer)
2. hexStringToBytes(String hexString)
3. hexStrToStr(String hexStr)
4. hexToAscii(byte[] src)