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90 lines
1.8 KiB
Go

package archiver
import (
"archive/zip"
"io"
"os"
"path/filepath"
"strings"
)
func unzip(src string, dst string, strip bool) error {
r, err := zip.OpenReader(src)
if err != nil {
return err
}
defer r.Close()
var prefixToStrip string
if strip {
var prefix []string
for _, f := range r.File {
var dir string
if !f.Mode().IsDir() {
dir = filepath.Dir(f.Name)
} else {
continue
}
if prefix != nil {
dirSplit := strings.Split(dir, string(filepath.Separator))
i, e, dse := 0, len(prefix), len(dirSplit)
if dse < e {
e = dse
}
for i < e {
if prefix[i] != dirSplit[i] {
prefix = prefix[0:i]
break
}
i++
}
} else {
prefix = strings.Split(dir, string(filepath.Separator))
}
}
prefixToStrip = strings.Join(prefix, string(filepath.Separator))
}
dirCache := make(map[string]bool) // todo: radix tree would perform better here
if err := os.MkdirAll(dst, 0755); err != nil {
return err
}
for _, f := range r.File {
var dir string
if !f.Mode().IsDir() {
dir = filepath.Dir(f.Name)
} else {
dir = filepath.Clean(f.Name)
if !strings.HasPrefix(dir, prefixToStrip) {
continue
}
}
dir = strings.TrimPrefix(dir, prefixToStrip)
if dir != "" && dir != "." {
cached := dirCache[dir]
if !cached {
if err := os.MkdirAll(filepath.Join(dst, dir), 0755); err != nil {
return err
}
dirCache[dir] = true
}
}
if !f.Mode().IsDir() {
name := filepath.Base(f.Name)
fr, err := f.Open()
if err != nil {
return err
}
d, err := os.OpenFile(filepath.Join(dst, dir, name),
os.O_WRONLY|os.O_CREATE|os.O_TRUNC, (f.Mode()|0600)&0777)
if err != nil {
return err
}
_, err = io.Copy(d, fr)
d.Close()
if err != nil {
return err
}
}
}
return nil
}