⬥ ID3 encoding/decoding library in Go ⬥
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package id3ed
import (
"fmt"
"os"
v1 "github.com/Unbewohnte/id3ed/v1"
v2 "github.com/Unbewohnte/id3ed/v2"
)
type File struct {
path string
ContainsID3v1 bool
ContainsID3v2 bool
ID3v1Tag *v1.ID3v1Tag
ID3v2Tag *v2.ID3v2Tag
}
// Opens file specified by `path`, reads all ID3 tags that
// it can find and returns a *File
func Open(path string) (*File, error) {
fhandler, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("could not open: %s", err)
}
defer fhandler.Close()
var file File
file.path = path // saving path to the file for future writing
v1tag, err := v1.Readv1Tag(fhandler)
switch err {
case nil:
file.ContainsID3v1 = true
case v1.ErrDoesNotUseID3v1:
file.ContainsID3v1 = false
default:
return nil, fmt.Errorf("could not read ID3v1 tag from file: %s", err)
}
file.ID3v1Tag = v1tag
v2tag, err := v2.ReadV2Tag(fhandler)
switch err {
case nil:
file.ContainsID3v2 = true
case v2.ErrDoesNotUseID3v2:
file.ContainsID3v2 = false
default:
return nil, fmt.Errorf("could not read ID3v2 tag from file: %s", err)
}
file.ID3v2Tag = v2tag
return &file, nil
}
// Writes given ID3v1 tag to file
func (f *File) WriteID3v1(tag *v1.ID3v1Tag) error {
fhandler, err := os.OpenFile(f.path, os.O_RDWR, os.ModePerm)
if err != nil {
return fmt.Errorf("could not open a file: %s", err)
}
defer fhandler.Close()
err = tag.WriteToFile(fhandler)
if err != nil {
return fmt.Errorf("could not write ID3v1 to file: %s", err)
}
return nil
}
// Writes given ID3v2 tag to file
func (f *File) WriteID3v2(tag *v2.ID3v2Tag) error {
fhandler, err := os.OpenFile(f.path, os.O_RDWR, os.ModePerm)
if err != nil {
return fmt.Errorf("could not open a file: %s", err)
}
defer fhandler.Close()
err = tag.WriteToFile(fhandler)
if err != nil {
return fmt.Errorf("could not write ID3v2 to file: %s", err)
}
return nil
}