}

// IsSet returns whether the type is valid and known.
func (c ChecksumType) IsSet() bool {
	return !c.Is(ChecksumInvalid) && !c.Is(ChecksumNone)
}

// NewChecksumType returns a checksum type based on the algorithm string.
func NewChecksumType(alg string) ChecksumType {
	switch strings.ToUpper(alg) {
	case "CRC32":
		return ChecksumCRC32
	case "CRC32C":
		return ChecksumCRC32C
	case "SHA1":

				writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
				return true
			}
			return checkPreconditionsPUT(ctx, w, r, oi, opts)
		}
	}

	checksumType := hash.NewChecksumType(r.Header.Get(xhttp.AmzChecksumAlgo))
	if checksumType.Is(hash.ChecksumInvalid) {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidRequestParameter), r.URL)
		return

	}

	// 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,
				Err:    fmt.Errorf("checksum type mismatch"),