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zip.go
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zip.go
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package archive
import (
"archive/zip"
"bytes"
"io"
"os"
"path/filepath"
"strings"
)
func init() {
_ = registerArchiver("zip", Zip)
}
var (
// Zip default instance
Zip = &zipper{}
zipHeader = []byte("PK\x03\x04")
zipExt = "zip"
)
type zipper struct{}
func (z *zipper) Meta() archiverMetadata {
return archiverMetadata{
Ext: zipExt,
}
}
func (z *zipper) Check(file string) bool {
if filepath.Ext(file) == "."+zipExt {
return true
}
header, err := extractHeader(file, 4)
if err != nil {
return false
}
return bytes.Compare(header, zipHeader) == 0
}
func (z *zipper) Compress(file, dest string) error {
return zipFile(file, dest)
}
func (z *zipper) Decompress(file, dest string) error {
return unzipFile(file, dest)
}
func unzipFile(file, dest string) error {
r, err := zip.OpenReader(file)
if err != nil {
return err
}
defer r.Close()
for _, f := range r.File {
rc, err := f.Open()
if err != nil {
return err
}
defer rc.Close()
fpath := filepath.Join(dest, f.Name)
if f.FileInfo().IsDir() {
os.MkdirAll(fpath, os.ModePerm)
} else {
if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
return err
}
outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
if err != nil {
return err
}
_, err = io.Copy(outFile, rc)
outFile.Close()
if err != nil {
return err
}
}
}
return nil
}
func zipFile(fname, dest string) error {
zipfile, err := os.Create(dest)
if err != nil {
return err
}
defer zipfile.Close()
archive := zip.NewWriter(zipfile)
defer archive.Close()
info, err := os.Stat(fname)
if err != nil {
return nil
}
var baseDir string
if info.IsDir() {
baseDir = filepath.Base(fname)
}
filepath.Walk(fname, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
header, err := zip.FileInfoHeader(info)
if err != nil {
return err
}
if baseDir != "" {
header.Name = filepath.Join(baseDir, strings.TrimPrefix(path, fname))
}
if info.IsDir() {
header.Name += "/"
} else {
header.Method = zip.Deflate
}
writer, err := archive.CreateHeader(header)
if err != nil {
return err
}
if info.IsDir() {
return nil
}
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
_, err = io.Copy(writer, file)
return err
})
return err
}