// to make parsing easier.
	v4Auth = strings.ReplaceAll(v4Auth, " ", "")
	if v4Auth == "" {
		return sv, ErrAuthHeaderEmpty
	}

	// Verify if the header algorithm is supported or not.
	if !strings.HasPrefix(v4Auth, signV4Algorithm) {
		return sv, ErrSignatureVersionNotSupported
	}

	// Strip off the Algorithm prefix.
	v4Auth = strings.TrimPrefix(v4Auth, signV4Algorithm)

	Opts     DeleteOptions `msg:"do"`
}

// RenameDataHandlerParams are parameters for RenameDataHandler.
type RenameDataHandlerParams struct {
	DiskID    string        `msg:"id"`
	SrcVolume string        `msg:"sv"`
	SrcPath   string        `msg:"sp"`
	DstVolume string        `msg:"dv"`
	DstPath   string        `msg:"dp"`
	FI        FileInfo      `msg:"fi"`
	Opts      RenameOptions `msg:"ro"`
}

			return
		}
		switch msgp.UnsafeString(field) {
		case "id":
			z.DiskID, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "DiskID")
				return
			}
		case "sv":
			z.SrcVolume, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "SrcVolume")
				return
			}
		case "sp":
			z.SrcPath, err = dc.ReadString()
			if err != nil {