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: v0.go
    path of file: ./repos/storj/storagenode/orders/ordersfile
    
    the code of the file until where you have to start completion: // Copyright (C) 2020 Storj Labs, Inc.
// See LICENSE for copying information.

package ordersfile

import (
	"encoding/binary"
	"errors"
	"io"
	"os"

	"storj.io/common/pb"
)

// fileV0 is a version 0 orders file.
type fileV0 struct {
	f *os.File
}

// OpenWritableV0 opens for writing the unsent or archived orders file at a given path.
func OpenWritableV0(path string) (Writable, error) {
	// create file if not exists or append
	f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return nil, Error.Wrap(err)
	}
	return &fileV0{
		f: f,
	}, nil
}

// OpenReadableV0 opens for reading the unsent or archived orders file at a given path.
func OpenReadableV0(path string) (Readab
    
func (of *fileV0) ReadOne() (info *Info, err error) {
	defer func() {
		if errors.Is(err, io.ErrUnexpectedEOF) {
			err = ErrEntryCorrupt.Wrap(err)
		}
	}()

	sizeBytes := [4]byte{}
	_, err = io.ReadFull(of.f, sizeBytes[:])
	if err != nil {
		return nil, Error.Wrap(err)
	}
	limitSize := binary.LittleEndian.Uint32(sizeBytes[:])
	if limitSize > uint32(orderLimitSizeCap) {
		return nil, ErrEntryCorrupt.New("invalid limit size: %d is over the maximum %d", limitSize, orderLimitSizeCap)
	}

	limitSerialized := make([]byte, limitSize)
	_, err = io.ReadFull(of.f, limitSerialized)
	if err != nil {
		return nil, Error.Wrap(err)
	}
	limit := &pb.OrderLimit{}
	err = pb.Unmarshal(limitSerialized, limit)
	if err != nil {
		// if there is an error unmarshalling, the file must be corrupt
		return nil, ErrEntryCorrupt.Wrap(err)
	}

	_, err = io.ReadFull(of.f, sizeBytes[:])
	if err != nil {
		return nil, Error.Wrap(err)
	}
	orderSize := binary.LittleEndian.Uint32(sizeBytes[:])
	if orderSize > uint32(orderSizeCap) {
		return nil, ErrEntryCorrupt.New("invalid order size: %d is over the maximum %d", orderSize, orderSizeCap)
	}

	orderSerialized := make([]byte, orderSize)
	_, err = io.ReadFull(of.f, orderSerialized)
	if err != nil {
		return nil, Error.Wrap(err)
	}
	order := &pb.Order{}
	err = pb.Unmarshal(orderSerialized, order)
	if err != nil {
		// if there is an error unmarshalling, the file must be corrupt
		return nil, ErrEntryCorrupt.Wrap(err)
	}

	return &Info{
		Limit: limit,
		Order: order,
	}, nil
}