assertCrc(referenceCrc(bytes), bytes);
    }
  }

  private static int referenceCrc(byte[] bytes) {
    int crc = ~0;
    for (byte b : bytes) {
      crc = (crc >>> 8) ^ Crc32cHashFunction.Crc32cHasher.byteTable[(crc ^ b) & 0xFF];
    }
    return ~crc;
  }

  /**
   * Verifies that the crc of an array of byte data matches the expected value.
   *

   * href="https://en.wikipedia.org/wiki/Hash_function">hash function</a>.
   *
   * @since 18.0
   */
  public static HashFunction crc32c() {
    return Crc32cHashFunction.CRC_32_C;
  }

  /**
   * Returns a hash function implementing the CRC-32 checksum algorithm (32 hash bits).
   *
   * <p>To get the {@code long} value equivalent to {@link Checksum#getValue()} for a {@code

      public HashFunction get() {
        return ChecksumType.CRC_32C.hashFunction;
      }
    },
    ABSTRACT_HASH_FUNCTION {
      @Override
      public HashFunction get() {
        return Crc32cHashFunction.CRC_32_C;
      }
    };

    static final HashFunction HASH_FUNCTION = pickFunction().get();

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