CCSDS 123.0-B-1 & 2 implementation in software. The implementation is compliant with the CCSDS 123.0-B-1 standard (https://public.ccsds.org/Pubs/123x0b1ec1s.pdf). It has since been extended to the 123.0-B-2 version (https://public.ccsds.org/Pubs/123x0b2c1.pdf)