The
zip_register_progress_callback()
function registers a callback function
progress_callback for the zip archive
archive. This function is called during
zip_close(3)
after every zip archive entry that's completely written to disk. The value
is a double in the range from 0.0 to 1.0. This can be
used to provide progress indicators for user interfaces.
zip_register_progress_callback() was added
in libzip 1.2.0. It was deprecated in libzip 1.3.0, use
zip_register_progress_callback_with_state()
instead.