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: parse_go_binary.go
    path of file: ./repos/syft/syft/pkg/cataloger/golang
    
    the code of the file until where you have to start completion: package golang

import (
	"bytes"
	"context"
	"debug/elf"
	"debug/macho"
	"debug/pe"
	"errors"
	"fmt"
	"io"
	"regexp"
	"runtime/debug"
	"strings"
	"time"

	"golang.org/x/mod/module"

	"github.com/anchore/syft/internal"
	"github.com/anchore/syft/internal/log"
	"github.com/anchore/syft/syft/artifact"
	"github.com/anchore/syft/syft/file"
	"github.com/anchore/syft/syft/internal/unionreader"
	"github.com/anchore/syft/syft/pkg"
	"github.com/anchore/syft/syft/pkg/cataloger/generic"
	"github.com/anchore/syft/syft/pkg/cataloger/golang/internal/xcoff"
)

const goArch = "GOARCH"

var (
	// errUnrecognizedFormat is returned when a given executable file doesn't
	// appear to be in a known format, or it breaks the rules of that format,
	// or when there are I/O errors reading the file.
	errUnrecognizedFormat = errors.New("unrecognized file format")
	// devel is used to recognize the current default version when a golang main distribution is built
	// https://github.com/golang/go/issues/29228 this issue has more details on the progress of being able to
	// inject the correct version into the main module of the build process

	knownBuildFlagPatterns = []*regexp.Regexp{
		regexp.MustCompile(`(?m)\.([gG]it)?([bB]uild)?[vV]er(sion)?=(\S+/)*(?P<version>v?\d+.\d+.\d+[-\w]*)`),
		regexp.MustCompile(`(?m)\.([tT]ag)=(\S+/)*(?P<version>v?\d+.\d+.\d+[-\w]*)`),
	}
)

const devel = "(devel)"

type goBinaryCataloger struct {
	licenses          goLicenses
	mainModuleVersion MainModuleVersionConfig
}

func newGoBinaryCataloger(opts CatalogerConfig) *goBinaryCataloger {
	return &goBinaryCataloger{
		licenses:         
    
func (c *goBinaryCataloger) findMainModuleVersion(metadata *pkg.GolangBinaryBuildinfoEntry, gbs pkg.KeyValues, reader io.ReadSeekCloser) string {
	vcsVersion, hasVersion := gbs.Get("vcs.revision")
	timestamp, hasTimestamp := gbs.Get("vcs.time")

	var ldflags, majorVersion, fullVersion string
	if c.mainModuleVersion.FromLDFlags && metadata != nil {
		// we've found a specific version from the ldflags! use it as the version.
		// why not combine that with the pseudo version (e.g. v1.2.3-0.20210101000000-abcdef123456)?
		// short answer: we're assuming that if a specific semver was provided in the ldflags that
		// there is a matching vcs tag to match that could be referenced. This assumption could
		// be incorrect in terms of the go.mod contents, but is not incorrect in terms of the logical
		// version of the package.
		ldflags, _ = metadata.BuildSettings.Get("-ldflags")

		majorVersion, fullVersion = extractVersionFromLDFlags(ldflags)
		if fullVersion != "" {
			return fullVersion
		}
	}

	// guess the version from pattern matching in the binary (can result in false positives)
	if c.mainModuleVersion.FromContents {
		_, err := reader.Seek(0, io.SeekStart)
		if err != nil {
			log.WithFields("error", err).Trace("unable to seek to start of go binary reader")
		} else {
			contents, err := io.ReadAll(reader)
			if err != nil {
				log.WithFields("error", err).Trace("unable to read from go binary reader")
			} else {
				matchMetadata := internal.MatchNamedCaptureGroups(semverPattern, string(contents))

				version, ok := matchMetadata["version"]
				if ok {
					return version
				}
			}
		}
	}

	// fallback to using the go standard pseudo v0.0.0 version
	if c.mainModuleVersion.FromBuildSettings && hasVersion && hasTimestamp {
		version := vcsVersion
		//NOTE: err is ignored, because if parsing fails
		// we still use the empty Time{} struct to generate an empty date, like 00010101000000
		// for consistency with the pseudo-version format: https://go.dev/ref/mod#pseudo-versions
		ts, _ := time.Parse(time.RFC3339, timestamp)
		if len(vcsVersion) >= 12 {
			version = vcsVersion[:12]
		}

		return module.PseudoVersion(majorVersion, fullVersion, ts, version)
	}

	return ""
}