unpack.go

package main

import (
	"archive/zip"
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"

	"facette.io/natsort"
)

func main() {
	if err := run(); err != nil {
		log.Fatalf("%+v", err)
	}

}
func run() error {
	f, err := zip.OpenReader("hw3.0_emmc.zip")
	if err != nil {
		return err
	}
	defer f.Close()
	files := map[string]*zip.File{}
	var fileNames []string
	for _, file := range f.File {
		if strings.HasSuffix(file.Name, "/") {
			// directory
			continue
		}
		files[file.Name] = file
		fileNames = append(fileNames, file.Name)
	}
	natsort.Sort(fileNames)
	log.Println("files", fileNames)
	output := filepath.Base(fileNames[0])
	log.Printf("writing to %s", output)
	out, err := os.OpenFile(output, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
	if err != nil {
		return err
	}
	defer out.Close()
	for _, fileName := range fileNames {
		file := files[fileName]
		log.Printf("reading %s", fileName)
		data, err := file.Open()
		if err != nil {
			return err
		}
		defer data.Close()
		if _, err := io.Copy(out, data); err != nil {
			return err
		}
	}
	return nil
}