+
+ time_t tile_age = a_preferences_get(VIKING_PREFERENCES_NAMESPACE "download_tile_age")->u;
+ /* Get the modified time of this file */
+ struct stat buf;
+ g_stat ( fn, &buf );
+ time_t file_time = buf.st_mtime;
+ if ( (time(NULL) - file_time) < tile_age ) {
+ /* File cache is too recent, so return */
+ return -3;
+ }
+
+ if (options->check_file_server_time) {
+ file_options.time_condition = file_time;
+ }
+ if (options->use_etag) {
+ gchar *etag_filename = g_strdup_printf("%s.etag", fn);
+ gsize etag_length = 0;
+ g_file_get_contents (etag_filename, &(file_options.etag), &etag_length, NULL);
+ g_free (etag_filename);
+ etag_filename = NULL;
+
+ /* check if etag is short enough */
+ if (etag_length > 100) {
+ g_free(file_options.etag);
+ file_options.etag = NULL;
+ }
+
+ /* TODO: should check that etag is a valid string */
+ }
+