A directory entry is a section of bytes that identify an element of metadata within an abi file. The structure of this entry is defined in: http://www6.appliedbiosystems.com/support/software_community/ABIF_File_Format.pdf

The header contains information about the abi file. This should always have the same format regardless of file version and so should be read first and then an appropriate parser chosen based on the file version.

Parses an applied biosystems data file format as defined in: http://www6.appliedbiosystems.com/support/software_community/ABIF_File_Format.pdf