protected static int toDigit(final char ch, final int index) throws HexDecodeException {
    """
	Converts a hexadecimal character to an integer.
	
	@param ch    A character to convert to an integer digit
	@param index The index of the character in the source
	@return An integer
	@throws HexDecodeException Thrown if ch is an illegal hex character
    """
        final int digit = Character.digit(ch, 16);
        if (digit == -1) {
            throw new HexDecodeException("Illegal hexadecimal character " + ch + " at index " + index);
        }
        return digit;
    }
protected static int toDigit(final char ch, final int index) throws HexDecodeException {
        final int digit = Character.digit(ch, 16);
        if (digit == -1) {
            throw new HexDecodeException("Illegal hexadecimal character " + ch + " at index " + index);
        }
        return digit;
    }
protected static int toDigit ( final char ch , final int index ) throws HexDecodeException { final int digit = Character . digit ( ch , 16 ) ; if ( digit == - 1 ) { throw new HexDecodeException ( "Illegal hexadecimal character " + ch + " at index " + index ) ; } return digit ; }
Converts a hexadecimal character to an integer.

@param ch    A character to convert to an integer digit
@param index The index of the character in the source
@return An integer
@throws HexDecodeException Thrown if ch is an illegal hex character
Converts a hexadecimal character to an integer .