pack_fopen_vtable(3)

💖 pack_fopen_vtable(3) 💖

okay bestie, so this one lives in the Allegro manual and it's literally the glow-up for packfiles that don't wanna play by the normal rules. no cap.

✨ NAME ✨

pack_fopen_vtable — Allegro game programming library. she's giving "I brought my own functions to the function party" 🎀

🌸 SYNOPSIS 🌸

#include <allegro.h>

PACKFILE *pack_fopen_vtable(const PACKFILE_VTABLE *vtable, void
*userdata);

🦋 DESCRIPTION 🦋

so basically? this makes a brand new packfile structure that uses the functions you specified in the vtable instead of the standard ones. yes, you're the main character here, you pick the functions. 💅

but listen — the data pointed to by vtable and userdata must remain available for the lifetime of the created packfile. like, do not let that memory ghost you mid-relationship. keep it alive, periodt.

and here's the tea 🍵: while the created packfile structure can be used with other Allegro functions, there are two limitations:

1. opening chunks using pack_fopen_chunk() on top of the returned packfile is not possible at this time. not me trying to chunk on a vtable packfile 😭 it just isn't happening.
2. packfile_password() does not have any effect on packfiles opened with pack_fopen_vtable(). the password is giving invisible, unbothered, irrelevant 🙈

⭐ RETURN VALUE ⭐

on success, she returns a pointer to a PACKFILE structure 🫶 and on error, she returns NULL and stores an error code in errno. vibe check failed, check your errno bestie 💀

🌈 SEE ALSO 🌈

• pack_fopen(3)
• pack_fopen_chunk(3)
• packfile_password(3)
• expackf(3)

mwah 💋 this whole page is from the Allegro crew, version 4.4.3, and it's dated pack_fopen_vtable(3) — so like, that's the source, the version, and the date, all wrapped up in a little bow for you 🎀✨