Anyone knows how the PREGAP, POSTGAP and INDEX 00 .cue commands affect the read CD, read TOC, read (10/12) and read capacity commands?

Right now, I've implemented INDEX 00 like PREGAP, with them being skipped during read sectors and read CD (type data) commands. The only difference being that INDEX 00 is stored inside the current file backend and PREGAP not being stored and read as zeroed data.

Anyone knows how they should be parsed?