static function getInstance($filename, $flags)
{
if (is_null(self::$gi)) {
$gi = new AnattaDesign_AwesomeCheckout_Model_GeoIP_Core();
$gi->flags = $flags;
if ($gi->flags & self::GEOIP_SHARED_MEMORY) {
$gi->shmid = @shmop_open(self::GEOIP_SHM_KEY, "a", 0, 0);
} else {
$gi->filehandle = fopen($filename, "rb");
if (!$gi->filehandle) {
throw new Exception("Can not open {$filename}\n");
}
if ($gi->flags & self::GEOIP_MEMORY_CACHE) {
$s_array = fstat($gi->filehandle);
$gi->memory_buffer = fread($gi->filehandle, $s_array['size']);
}
}
$gi = self::_setup_segments($gi);
self::$gi = $gi;
}
return self::$gi;
}
