ToME2 code discussion

[darwin]

I have the goal of making a roguelike that is eventually savefile-compatible with the current ToME2. I have a question about how it works. In defines.h, there are two defines for doors, over a range of about 16 numbers, with nothing in between. IIRC, Angband has defines for each type of door. If ToME does not define each type of door, but just 'door head' and 'door tail,' how do doors even work in the dungeon map, generation, and gameplay?