Simple types in ASN.1 consist of the following:

Each simple type is mapped to a corresponding string representation of the input data. This is a relatively straightforward conversion. Of special note, we use the BOOLEAN values "TRUE" (for any hex octet not equal to 0x00) and "FALSE" (for any hex octet equal to 0x00). NULL values are outputted simply as "NULL."

Simple type mappings require no extra logic for output. Their textual representations are generally quite straightforward. Mapping complex types, however, is more difficult.