code: public static boolean isBinary(String ext) {
          if (isImage(ext))
              return true;
          return "xlsx".equals(ext) || "docx".equals(ext) || "jar".equals(ext) || "class".equals(ext)
                  || "zip".equals(ext) || "eot".equals(ext) || "ttf".equals(ext) || "woff".equals(ext) || "woof2".equals(ext);
      }
docs: TODO: extensibility