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: buildid.go
    path of file: ./repos/gccrs/libgo/go/cmd/internal/buildid
    
    the code of the file until where you have to start completion: // Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package buildid

import (
	"bytes"
	"debug/elf"
	"fmt"
	"internal/xcoff"
	"io"
	"io/fs"
	"os"
	"strconv"
	"strings"
)

var (
	errBuildIDMalformed = fmt.Errorf("malformed object file")

	bangArch = []byte("!<arch>")
	pkgdef   = []byte("__.PKGDEF")
	goobject = []byte("go object ")
	buildid  = []byte("build id ")
)

// ReadFile reads the build ID from an archive or executable file.
func ReadFile(name string) (id string, err error) {
	f, err := os.Open(name)
	if err != nil {
		re
    
func ReadFile(name string) (id string, err error) {
	f, err := os.Open(name)
	if err != nil {
		return "", err
	}
	defer f.Close()

	buf := make([]byte, 8)
	if _, err := f.ReadAt(buf, 0); err != nil {
		return "", err
	}
	if string(buf) != "!<arch>\n" {
		if string(buf) == "<bigaf>\n" {
			return readGccgoBigArchive(name, f)
		}
		return readBinary(name, f)
	}

	// Read just enough of the target to fetch the build ID.
	// The archive is expected to look like:
	//
	//	!<arch>
	//	__.PKGDEF       0           0     0     644     7955      `
	//	go object darwin amd64 devel X:none
	//	build id "b41e5c45250e25c9fd5e9f9a1de7857ea0d41224"
	//
	// The variable-sized strings are GOOS, GOARCH, and the experiment list (X:none).
	// Reading the first 1024 bytes should be plenty.
	data := make([]byte, 1024)
	n, err := io.ReadFull(f, data)
	if err != nil && n == 0 {
		return "", err
	}

	tryGccgo := func() (string, error) {
		return readGccgoArchive(name, f)
	}

	// Archive header.
	for i := 0; ; i++ { // returns during i==3
		j := bytes.IndexByte(data, '\n')
		if j < 0 {
			return tryGccgo()
		}
		line := data[:j]
		data = data[j+1:]
		switch i {
		case 0:
			if !bytes.Equal(line, bangArch) {
				return tryGccgo()
			}
		case 1:
			if !bytes.HasPrefix(line, pkgdef) {
				return tryGccgo()
			}
		case 2:
			if !bytes.HasPrefix(line, goobject) {
				return tryGccgo()
			}
		case 3:
			if !bytes.HasPrefix(line, buildid) {
				// Found the object header, just doesn't have a build id line.
				// Treat as successful, with empty build id.
				return "", nil
			}
			id, err := strconv.Unquote(string(line[len(buildid):]))
			if err != nil {
				return tryGccgo()
			}
			return id, nil
		}
	}
}