PhysicsFS is a library to provide abstract access to various archives. See http://icculus.org/physfs/ for more information.
This addon makes it possible to read and write files (on disk or inside archives) using PhysicsFS, through Allegro's file I/O API. For example, that means you can use the Image I/O addon to load images from .zip files.
You must set up PhysicsFS through its own API. When you want to open an ALLEGRO_FILE using PhysicsFS, first call al_set_physfs_file_interface, then al_fopen or another function that calls al_fopen.
These functions are declared in the following header file. Link with allegro_physfs.
#include <allegro5/allegro_physfs.h>
al_set_physfs_file_interface
void al_set_physfs_file_interface(void)
After calling this, subsequent calls to al_fopen will be handled by PHYSFS_open(). Operations on the files returned by al_fopen will then be performed through PhysicsFS.
At the same time, all filesystem functions like al_read_directory or al_create_fs_entry will use PhysicsFS.
This functions only affects the thread it was called from.
To remember and restore another file I/O backend, you can use al_store_state/al_restore_state.
See also: al_set_new_file_interface.
al_get_allegro_physfs_version
uint32_t al_get_allegro_physfs_version(void)
Returns the (compiled) version of the addon, in the same format as al_get_allegro_version.