130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
package qmc
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"encoding/binary"
|
|
"errors"
|
|
|
|
"github.com/unlock-music/cli/algo/common"
|
|
)
|
|
|
|
var (
|
|
ErrQmcFileLength = errors.New("invalid qmc file length")
|
|
ErrQmcKeyDecodeFailed = errors.New("base64 decode qmc key failed")
|
|
ErrQmcKeyLength = errors.New("unexpected decoded qmc key length")
|
|
)
|
|
|
|
type OldDecoder struct {
|
|
file []byte
|
|
maskDetector func(encodedData []byte) (*Key256Mask, error)
|
|
mask *Key256Mask
|
|
audioExt string
|
|
key []byte
|
|
audio []byte
|
|
}
|
|
|
|
func NewMflac256Decoder(data []byte) common.Decoder {
|
|
return &OldDecoder{file: data, maskDetector: detectMflac256Mask, audioExt: "flac"}
|
|
}
|
|
|
|
func NewMgg256Decoder(data []byte) common.Decoder {
|
|
return &OldDecoder{file: data, maskDetector: detectMgg256Mask, audioExt: "ogg"}
|
|
}
|
|
|
|
func (d *OldDecoder) Validate() error {
|
|
if nil != d.mask {
|
|
return nil
|
|
}
|
|
if nil != d.maskDetector {
|
|
if err := d.validateKey(); err != nil {
|
|
return err
|
|
}
|
|
var err error
|
|
d.mask, err = d.maskDetector(d.file)
|
|
return err
|
|
}
|
|
return errors.New("no mask or mask detector found")
|
|
}
|
|
|
|
func (d *OldDecoder) validateKey() error {
|
|
lenData := len(d.file)
|
|
if lenData < 4 {
|
|
return ErrQmcFileLength
|
|
}
|
|
|
|
keyLen := binary.LittleEndian.Uint32(d.file[lenData-4:])
|
|
if lenData < int(keyLen+4) {
|
|
return ErrQmcFileLength
|
|
}
|
|
var err error
|
|
d.key, err = base64.StdEncoding.DecodeString(
|
|
string(d.file[lenData-4-int(keyLen) : lenData-4]))
|
|
if err != nil {
|
|
return ErrQmcKeyDecodeFailed
|
|
}
|
|
|
|
if len(d.key) != 272 {
|
|
return ErrQmcKeyLength
|
|
}
|
|
d.file = d.file[:lenData-4-int(keyLen)]
|
|
return nil
|
|
|
|
}
|
|
|
|
func (d *OldDecoder) Decode() error {
|
|
d.audio = d.mask.Decrypt(d.file)
|
|
return nil
|
|
}
|
|
|
|
func (d OldDecoder) GetCoverImage() []byte {
|
|
return nil
|
|
}
|
|
|
|
func (d OldDecoder) GetAudioData() []byte {
|
|
return d.audio
|
|
}
|
|
|
|
func (d OldDecoder) GetAudioExt() string {
|
|
if d.audioExt != "" {
|
|
return "." + d.audioExt
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func (d OldDecoder) GetMeta() common.Meta {
|
|
return nil
|
|
}
|
|
|
|
func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
|
|
return func(file []byte) common.Decoder {
|
|
return &OldDecoder{file: file, audioExt: ext, mask: getDefaultMask()}
|
|
}
|
|
}
|
|
|
|
//goland:noinspection SpellCheckingInspection
|
|
func init() {
|
|
common.RegisterDecoder("qmc0", false, DecoderFuncWithExt("mp3")) //QQ Music Mp3
|
|
common.RegisterDecoder("qmc3", false, DecoderFuncWithExt("mp3")) //QQ Music Mp3
|
|
|
|
common.RegisterDecoder("qmc2", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
|
|
common.RegisterDecoder("qmc4", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
|
|
common.RegisterDecoder("qmc6", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
|
|
common.RegisterDecoder("qmc8", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
|
|
|
|
common.RegisterDecoder("qmcflac", false, DecoderFuncWithExt("flac")) //QQ Music Flac
|
|
common.RegisterDecoder("qmcogg", false, DecoderFuncWithExt("ogg")) //QQ Music Ogg
|
|
common.RegisterDecoder("tkm", false, DecoderFuncWithExt("m4a")) //QQ Music Accompaniment M4a
|
|
|
|
common.RegisterDecoder("bkcmp3", false, DecoderFuncWithExt("mp3")) //Moo Music Mp3
|
|
common.RegisterDecoder("bkcflac", false, DecoderFuncWithExt("flac")) //Moo Music Flac
|
|
|
|
common.RegisterDecoder("666c6163", false, DecoderFuncWithExt("flac")) //QQ Music Weiyun Flac
|
|
common.RegisterDecoder("6d7033", false, DecoderFuncWithExt("mp3")) //QQ Music Weiyun Mp3
|
|
common.RegisterDecoder("6f6767", false, DecoderFuncWithExt("ogg")) //QQ Music Weiyun Ogg
|
|
common.RegisterDecoder("6d3461", false, DecoderFuncWithExt("m4a")) //QQ Music Weiyun M4a
|
|
common.RegisterDecoder("776176", false, DecoderFuncWithExt("wav")) //QQ Music Weiyun Wav
|
|
|
|
common.RegisterDecoder("mgg", false, NewMgg256Decoder) //QQ Music New Ogg
|
|
common.RegisterDecoder("mflac", false, NewMflac256Decoder) //QQ Music New Flac
|
|
}
|