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: format.go
    path of file: ./repos/ipsw/pkg/ctf
    
    the code of the file until where you have to start completion: package ctf

import (
	"bytes"
	"encoding/json"
	"fmt"
	"strconv"
	"strings"
	"text/tabwriter"
)

type Type interface {
	ID() int
	Name() string
	Info() Info
	ParentID() int
	Type() string
	String() string
	Dump() string
}

type Integer struct {
	id       int
	name     string
	info     Info
	encoding intEncoding
}

func (i *Integer) ID() int {
	return i.id
}
func (i *Integer) Name() string {
	return i.name
}
func 
    
func (p *PtrAuth) MarshalJSON() ([]byte, error) {
	return json.Marshal(&struct {
		ID          int         `json:"id,omitempty"`
		Name        string      `json:"name,omitempty"`
		Info        Info        `json:"info,omitempty"`
		Data        ptrAuthData `json:"data,omitempty"`
		ReferenceID uint        `json:"reference_id,omitempty"`
		Reference   string      `json:"reference,omitempty"`
	}{
		ID:          p.id,
		Name:        p.name,
		Info:        p.info,
		Data:        p.data,
		ReferenceID: uint(p.reference),
		Reference:   p.Reference(),
	})
}