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fix: seek to audio start after validate

This commit is contained in:
Unlock Music Dev 2022-11-19 07:25:44 +08:00
parent 67ff0c44cd
commit 2880c63bf7
Signed by: um-dev
GPG Key ID: 95202E10D3413A1D
1 changed files with 11 additions and 11 deletions
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22
algo/kgm/kgm.go
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@ -19,25 +19,25 @@ func NewDecoder(rd io.ReadSeeker) common.Decoder {
return &Decoder{rd: rd}
}
var kgmCryptoInitializers = map[uint32]func(header *header) (common.StreamDecoder, error){
3: newKgmCryptoV3,
}
func (d *Decoder) Validate() error {
func (d *Decoder) Validate() (err error) {
if err := d.header.FromFile(d.rd); err != nil {
return err
}
// TODO; validate crypto version
initializer, ok := kgmCryptoInitializers[d.header.CryptoVersion]
if !ok {
switch d.header.CryptoVersion {
case 3:
d.cipher, err = newKgmCryptoV3(&d.header)
if err != nil {
return fmt.Errorf("kgm init crypto v3: %w", err)
}
default:
return fmt.Errorf("kgm: unsupported crypto version %d", d.header.CryptoVersion)
}
var err error
d.cipher, err = initializer(&d.header)
if err != nil {
return fmt.Errorf("kgm: failed to initialize crypto: %w", err)
// prepare for read
if _, err := d.rd.Seek(int64(d.header.AudioOffset), io.SeekStart); err != nil {
return fmt.Errorf("kgm seek to audio: %w", err)
}
return nil