You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mtp_dcoptions.go
    path of file: ./repos/td/session/tdesktop
    
    the code of the file until where you have to start completion: package tdesktop

import (
	"github.com/go-faster/errors"

	"github.com/gotd/td/bin"
)

// MTPDCOption is a Telegram Desktop storage structure which stores DC info.
//
// See https://github.com/telegramdesktop/tdesktop/blob/v2.9.8/Telegram/SourceFiles/mtproto/mtproto_dc_options.h.
type MTPDCOption struct {
	ID     int32
	Flags  bin.Fields
	Port   int32
	IP     string
	Secret []byte
}

// IPv6 denotes that the specified IP is an IPv6 address.
func (m MTPDCOption) IPv6() bool {
	return m.Flags.Has(0)
}

// MediaOnly denotes that this DC should only be used to download or upload files.
func (
    
func (m *MTPDCOption) deserialize(r *qtReader, version int32) error {
	id, err := r.readInt32()
	if err != nil {
		return errors.Wrap(err, "read id")
	}
	m.ID = id

	flags, err := r.readUint32()
	if err != nil {
		return errors.Wrap(err, "read flags")
	}
	m.Flags = bin.Fields(flags)

	port, err := r.readInt32()
	if err != nil {
		return errors.Wrap(err, "read port")
	}
	m.Port = port

	const maxIPSize = 45
	ip, err := r.readString()
	if err != nil {
		return errors.Wrap(err, "read ip")
	}
	if l := len(ip); l > maxIPSize {
		return errors.Errorf("too big IP string (%d > %d)", l, maxIPSize)
	}
	m.IP = ip

	if version > 0 {
		const maxSecretSize = 32
		secret, err := r.readBytes()
		if err != nil {
			return errors.Wrap(err, "read secret")
		}
		if l := len(secret); l > maxSecretSize {
			return errors.Errorf("too big DC secret (%d > %d)", l, maxSecretSize)
		}
		m.Secret = secret
	}

	return nil
}