if errors.Is(err, io.EOF) {
		err = &xml.SyntaxError{
			Line: 0,
			Msg:  err.Error(),
		}
	}
	return err
}

// validateLengthAndChecksum returns if a content checksum is set,
// and will replace r.Body with a reader that checks the provided checksum
func validateLengthAndChecksum(r *http.Request) bool {
	if mdFive := r.Header.Get(xhttp.ContentMD5); mdFive != "" {
		want, err := base64.StdEncoding.DecodeString(mdFive)

		return
	}

	// Content-Md5 is required should be set
	// http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
	if !validateLengthAndChecksum(r) {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMissingContentMD5), r.URL)
		return
	}

	// Content-Length is required and should be non-zero