The pregen file starts with the string:
"ANT Search Engine Pregen File\n\0"
Then the string which identifies the field name for this pregenerated ranking.
Then a sequence of
ANT_pregen_t's which encode the RSV's for each document.
Finally a "header" of 5
uint32_t's containing the following information: the version of the pregen file, the number of documents,
sizeof(ANT_pregen_t), the type of pregen and finally the length of the field name string.