private static Crc32CSupplier pickFunction() {
      Crc32CSupplier[] functions = values();

      if (functions.length == 1) {
        // We're running under J2ObjC.
        return functions[0];
      }

      // We can't refer to JAVA_UTIL_ZIP directly at compile time because of J2ObjC.
      Crc32CSupplier javaUtilZip = functions[0];

      try {