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    /**
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    /**
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     * Method: convert4B()
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     * Method: convert4B()
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     * Purpose: Convert a number from it's 4B representation to the
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     * Purpose: Convert a number from it's 4B representation to the
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     * corresponding 5B representation.
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     * corresponding 5B representation.
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     */
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     */
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    public static String convert4B (String _4BNum)
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    public static byte[] convert4B (byte[] _4BNum)
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    {
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    {
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        String s = convertToString (_4BNum);
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        int i = encodingTable.length - 1;
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        int i = encodingTable.length - 1;
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        for (; i >= 0; i--)
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        for (; i >= 0; i--)
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            if (encodingTable[i][0].equals(_4BNum))
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            if (encodingTable[i][0].equals(s))
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                return encodingTable[i][1];
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                return convertToByteArray(encodingTable[i][1]);
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        throw new IllegalArgumentException();
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        throw new IllegalArgumentException();
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    }
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    }
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    /**
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    /**
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     * Method: convert5B()
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     * Method: convert5B()
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     * Purpose: Convert a number from it's 5B representation to the
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     * Purpose: Convert a number from it's 5B representation to the
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     * corresponding 4B representation.
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     * corresponding 4B representation.
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     */
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     */
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    public static String convert5B (String _5BNum)
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    public static byte[] convert5B (byte[] _5BNum)
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    {
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    {
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        int i = encodingTable.length - 1;
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        int i = encodingTable.length - 1;
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        String s = convertToString (_5BNum);
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        for (; i>=0; i--)
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        for (; i>=0; i--)
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            if (encodingTable[i][1].equals(_5BNum))
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            if (encodingTable[i][1].equals(s))
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                return encodingTable[i][0];
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                return convertToByteArray(encodingTable[i][0]);
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        throw new IllegalArgumentException();
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        throw new IllegalArgumentException();
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    }
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    }
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    public static byte[] convertToByteArray (String num)
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    {
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        int i;
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        byte[] ret = new byte[num.length()];
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        byte temp;
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        for (i=0; i<ret.length; i++)
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        {
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            if (num.charAt(i) == '0')
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                temp = 0;
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            else if (num.charAt(i) == '1')
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                temp = 1;
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            else
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                throw new IllegalArgumentException();
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- 
 
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            ret[i] = temp;
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        }
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        return ret;
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    }
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    public static String convertToString (byte[] num)
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    {
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        int i;
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        String s = new String();
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        for (i=0; i<num.length; i++)
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            s = new String (s + num[i]);
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        return s;
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    }
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}
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}
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