@Immutable
  private enum Crc32CSupplier implements ImmutableSupplier<HashFunction> {
    @J2ObjCIncompatible
    JAVA_UTIL_ZIP {
      @Override
      public HashFunction get() {
        return ChecksumType.CRC_32C.hashFunction;
      }
    },
    ABSTRACT_HASH_FUNCTION {
      @Override
      public HashFunction get() {
        return Crc32cHashFunction.CRC_32_C;
      }
    };