Character

Character files do not record how many materials were used. They do store your base stats, so the counts are derived from those.

Materials used = (base stat − the base value for that class and level) ÷ 2

The file stores growth with the per-class base value (min) subtracted, so min is added back for display. Verified against Lv1 characters (which cannot have used materials): all six stats match the wiki base values exactly.

HP and TP mats are not derived from stats. They are read directly from the inventory header at the start of the file (hp_from_materials / tp_from_materials) and divided by 2. This used to be labeled "cannot be determined," but a look at the struct definition in newserv (a public PSOBB server implementation) confirmed the fields sit at their canonical positions. Characters imported earlier will show these once you re-import them.