protocol

type CommandDeleteMsg struct {
	Sn        []byte
	CmdSyn    *bpop.CommandSyn
	CmdDelete *bpop.CmdDelete

	CmdDelAck *bpop.CmdDeleteAck
	CmdAck    *bpop.CommandAck
}

type CommandDownloadMsg struct {
	Sn          []byte
	CmdSyn      *bpop.CommandSyn
	CmdDownload *bpop.CmdDownload

	CmdDownAck *bpop.CmdDownloadAck
	CmdAck     *bpop.CommandAck
}

type CryptEnvelopeMsg struct {
	Sn      []byte
	EpSyn   *bmp.EnvelopeSyn
	CryptEp *bmp.BMailEnvelope
	//RawEp *bmp.RawEnvelope
	EpAck *bmp.EnvelopeAck
}

type RBody interface {
	UnPack(data []byte) error
	Verify() bool
	SetCurrentSn(sn []byte)
	Dispatch() error
	Response() (WBody, error)
}

type WBody interface {
	MsgType() uint16
	GetBytes() ([]byte, error)
}