ChecksumIncludesMultipart

	// ChecksumNone indicates no checksum.
	ChecksumNone ChecksumType = 0
)

// Checksum is a type and base 64 encoded value.
type Checksum struct {
	Type      ChecksumType
	Encoded   string
	Raw       []byte
	WantParts int
}

// Is returns if c is all of t.
func (c ChecksumType) Is(t ChecksumType) bool {
	if t == ChecksumNone {
		return c == ChecksumNone
	}
	return c&t == t
}

		return oi, toObjectErr(err, bucket, object)
	}

	// Checksum type set when upload started.
	var checksumType hash.ChecksumType
	if cs := fi.Metadata[hash.MinIOMultipartChecksum]; cs != "" {
		checksumType = hash.NewChecksumType(cs)
		if opts.WantChecksum != nil && !opts.WantChecksum.Type.Is(checksumType) {
			return oi, InvalidArgument{
				Bucket: bucket,
				Object: fi.Name,

   * href="https://en.wikipedia.org/wiki/Hash_function">hash function</a>.
   *
   * @since 14.0
   */
  public static HashFunction adler32() {
    return ChecksumType.ADLER_32.hashFunction;
  }

  @Immutable
  enum ChecksumType implements ImmutableSupplier<Checksum> {
    CRC_32("Hashing.crc32()") {
      @Override
      public Checksum get() {
        return new CRC32();
      }
    },

		}
	}

	checksumType := hash.NewChecksumType(r.Header.Get(xhttp.AmzChecksumAlgo))
	if checksumType.Is(hash.ChecksumInvalid) {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidRequestParameter), r.URL)
		return
	} else if checksumType.IsSet() && !checksumType.Is(hash.ChecksumTrailing) {
		opts.WantChecksum = &hash.Checksum{Type: checksumType}
	}

func (r *Reader) SHA256HexString() string {
	return hex.EncodeToString(r.contentSHA256)
}

// ContentCRCType returns the content checksum type.
func (r *Reader) ContentCRCType() ChecksumType {
	return r.contentHash.Type
}

// ContentCRC returns the content crc if set.
func (r *Reader) ContentCRC() map[string]string {
	if r.contentHash.Type == ChecksumNone || !r.contentHash.Valid() {
		return nil