*/
    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);

        if( length == 0 ) {
            return;
        }

        int s = length % 16;
        int r = ( s == 0 ) ? length / 16 : length / 16 + 1;
        char[] c = new char[r * (74 + NL_LENGTH)];
        char[] d = new char[16];
        int i;
        int si = 0;
        int ci = 0;

        do {
            toHexChars( si, c, ci, 5 );
            ci += 5;
            c[ci++] = ':';