+int parser_replace_file(struct discover_context *ctx,
+ struct discover_device *dev, const char *filename,
+ char *buf, int len);
+int parser_request_url(struct discover_context *ctx, struct pb_url *url,
+ char **buf, int *len);
+int parser_check_dir(struct discover_context *ctx,
+ struct discover_device *dev, const char *dirname);