Create ZIP file in Go (made with https://codeeval.dev)

readme.md

Creating ZIP archives in Go

Go standard library has archive/zip package for reading and creating ZIP archives.

create_zip_file.go

package main

import (
	"archive/zip"
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
)

func zipAddFile(zw *zip.Writer, filePath string, pathInZip string) error {
	f, err := os.Open(filePath)
	if err != nil {
		return err
	}
	defer f.Close()
	if pathInZip == "" {
		pathInZip = filepath.Base(filePath)
	}
	w, err := zw.Create(pathInZip)
	if err != nil {
		return err
	}
	_, err = io.Copy(w, f)
	return err
}

func main() {
	fw, err := os.Create("out.zip")
	if err != nil {
		log.Fatalf("os.Create() failed with '%s'\n", err)
	}
	zw := zip.NewWriter(fw)
	err = zipAddFile(zw, "create_zip_file.go", "")
	if err != nil {
		log.Fatalf("zipAddFile() failed with '%s'\n", err)
	}
	err = zipAddFile(zw, "create_zip_file.go", "another copy.go")
	if err != nil {
		log.Fatalf("zipAddFile() failed with '%s'\n", err)
	}
	_ = zw.Close()
	_ = fw.Close()
	printFileName("out.zip")
}

func printFileName(filePath string) {
	st, _ := os.Stat(filePath)
	fmt.Printf("Size of file '%s' is %d bytes\n", filePath, st.Size())
}