code: public byte []
  getBase32String(base32 b32) throws IOException {
  	String next = _getIdentifier("a base32 string");
  	byte [] array = b32.fromString(next);
  	if (array == null)
  		throw exception("invalid base32 encoding");
  	return array;
  }
docs: Gets the next token from a tokenizer and decodes it as base32.
  @param b32 The base32 context to decode with.
  @return The byte array containing the decoded string.
  @throws TextParseException The input was invalid.
  @throws IOException An I/O error occurred.