/
tar.go
166 lines (135 loc) · 2.84 KB
/
tar.go
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// Created on: 2022-02-20
// Custom tar functions will likely not work for other needs.
package gnotes
import (
"archive/tar"
"bytes"
"compress/gzip"
"fmt"
"io"
"os"
"path/filepath"
"strings"
)
func gzipCompressFile(file string) ([]byte, error) {
b, err := os.ReadFile(file)
if err != nil {
return []byte{}, err
}
return gzipCompress(b), nil
}
func gzipCompress(in []byte) []byte {
comp := bytes.NewBuffer(nil)
w := gzip.NewWriter(comp)
w.Write(in)
w.Close()
return comp.Bytes()
}
func gzipExtractFile(file string) ([]byte, error) {
b, err := os.ReadFile(file)
if err != nil {
return []byte{}, err
}
ex, err := gzipExtract(b)
if err != nil {
return []byte{}, err
}
return ex, nil
}
func gzipExtract(in []byte) ([]byte, error) {
decmp := bytes.NewBuffer(nil)
decmp.Write(in)
r, err := gzip.NewReader(decmp)
if err != nil {
return []byte{}, err
}
b, err := io.ReadAll(r)
if err != nil {
return []byte{}, err
}
r.Close()
return b, nil
}
func tarCompress(src string) ([]byte, error) {
buf := bytes.NewBuffer(nil)
zr := gzip.NewWriter(buf)
tw := tar.NewWriter(zr)
err := filepath.Walk(src, func(file string, fi os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("got error: %s", err)
}
header, err := tar.FileInfoHeader(fi, file)
if err != nil {
return err
}
header.Name = strings.TrimPrefix(strings.TrimPrefix(file, src), "/")
if header.Name == "" {
return nil
}
if err := tw.WriteHeader(header); err != nil {
return err
}
if !fi.IsDir() {
data, err := os.Open(file)
if err != nil {
return err
}
if _, err := io.Copy(tw, data); err != nil {
return err
}
}
return nil
})
if err != nil {
return []byte{}, fmt.Errorf("failed to open dir: %s", err)
}
if err := tw.Close(); err != nil {
return []byte{}, err
}
if err := zr.Close(); err != nil {
return []byte{}, err
}
return buf.Bytes(), nil
}
// dst contains the end dir. Note: will not overide files, I think...
func untar(src []byte, dst string) error {
buff := bytes.NewBuffer(nil)
buff.Write(src)
zr, err := gzip.NewReader(buff)
if err != nil {
return err
}
tr := tar.NewReader(zr)
for {
fmt.Println("FOO1")
header, err := tr.Next()
if err == io.EOF {
break
}
fmt.Println("FOO2")
if err != nil {
return err
}
target := filepath.Join(dst, header.Name)
fmt.Println("FOOBAR:", target)
switch header.Typeflag {
case tar.TypeDir:
if _, err := os.Stat(target); err != nil {
if err := os.MkdirAll(target, 0755); err != nil {
return err
}
}
case tar.TypeReg:
fmt.Println("WRITEING TO:", target)
fileToWrite, err := os.OpenFile(target, os.O_CREATE|os.O_RDWR, os.FileMode(header.Mode))
if err != nil {
return err
}
if _, err := io.Copy(fileToWrite, tr); err != nil {
return err
}
fileToWrite.Close()
}
}
return nil
}