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A pure-java CIFS/SMB client library
There is a newer version: 2.1.10
/* jcifs smb client library in Java
 * Copyright (C) 2000  "Michael B. Allen" 
 *                     "Christopher R. Hertel" 
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.util;


/**
 */

public class Hexdump {

    /**
     * 
     */
    public static final char[] HEX_DIGITS = {
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
    };


    /**
     * This is an alternative to the java.lang.Integer.toHexString
     * method. It is an efficient relative that also will pad the left side so
     * that the result is size digits.
     * 
     * @param val
     * @param size
     * @return hex string
     */
    public static String toHexString ( int val, int size ) {
        char[] c = new char[size];
        toHexChars(val, c, 0, size);
        return new String(c);
    }


    /**
     * @param val
     * @param size
     * @return hex string
     */
    public static String toHexString ( long val, int size ) {
        char[] c = new char[size];
        toHexChars(val, c, 0, size);
        return new String(c);
    }


    /**
     * 
     * @param src
     * @param srcIndex
     * @param size
     * @return hex string
     */
    public static String toHexString ( byte[] src, int srcIndex, int size ) {
        char[] c = new char[2 * size];
        for ( int i = 0, j = 0; i < size; i++ ) {
            c[ j++ ] = HEX_DIGITS[ ( src[ srcIndex + i ] >> 4 ) & 0x0F ];
            c[ j++ ] = HEX_DIGITS[ src[ srcIndex + i ] & 0x0F ];
        }
        return new String(c);
    }


    /**
     * @param data
     * @return hex string
     */
    public static String toHexString ( byte[] data ) {
        return toHexString(data, 0, data.length);
    }


    /**
     * This is the same as {@link jcifs.util.Hexdump#toHexString(int val, int
     * size)} but provides a more practical form when trying to avoid {@link
     * java.lang.String} concatenation and {@link java.lang.StringBuffer}.
     * 
     * @param val
     * @param dst
     * @param dstIndex
     * @param size
     */
    public static void toHexChars ( int val, char dst[], int dstIndex, int size ) {
        while ( size > 0 ) {
            int i = dstIndex + size - 1;
            if ( i < dst.length ) {
                dst[ i ] = HEX_DIGITS[ val & 0x000F ];
            }
            if ( val != 0 ) {
                val >>>= 4;
            }
            size--;
        }
    }


    /**
     * @param val
     * @param dst
     * @param dstIndex
     * @param size
     */
    public static void toHexChars ( long val, char dst[], int dstIndex, int size ) {
        while ( size > 0 ) {
            dst[ dstIndex + size - 1 ] = HEX_DIGITS[ (int) ( val & 0x000FL ) ];
            if ( val != 0 ) {
                val >>>= 4;
            }
            size--;
        }
    }

}