-
Notifications
You must be signed in to change notification settings - Fork 1
/
extract.go
74 lines (60 loc) · 1.48 KB
/
extract.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
package main
import (
"archive/zip"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"regexp"
bc "github.com/apprehensions/hazelnut/bandcamp"
)
// life - demo two - 05 twelve travel.flac -> 05 twelve travel.flac
var TrackPattern = regexp.MustCompile(`.* - (\d+.*\.\w+)$`)
func (cd *CollectionDownloader) Extract(i *bc.Item, src *os.File, dir string) error {
if _, err := src.Seek(0, io.SeekStart); err != nil {
return fmt.Errorf("seek: %w", err)
}
st, err := src.Stat()
if err != nil {
return fmt.Errorf("stat: %w", err)
}
r, err := zip.NewReader(src, st.Size())
if err != nil {
return fmt.Errorf("zip reader: %w", err)
}
for _, f := range r.File {
if f.FileInfo().IsDir() {
return errors.New("unexpected directory")
}
name := f.Name
if filepath.Ext(name) == cd.ext {
match := TrackPattern.FindStringSubmatch(name)
if len(match) != 2 {
return fmt.Errorf("unexpected track filename format: %s", name)
}
name = match[1]
}
name = filepath.Join(dir, name)
if err := unzipFile(f, name); err != nil {
return fmt.Errorf("unzip file: %w")
}
}
return nil
}
func unzipFile(src *zip.File, name string) error {
f, err := os.OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, src.Mode())
if err != nil {
return fmt.Errorf("create: %w", err)
}
defer f.Close()
z, err := src.Open()
if err != nil {
return fmt.Errorf("open: %w", err)
}
defer z.Close()
if _, err := io.Copy(f, z); err != nil {
return fmt.Errorf("copy: %w", err)
}
return nil
}