refactor: qmc musicex footer parser
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18eb369de8
commit
655b091744
@ -1,11 +1,9 @@
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package qmc
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import (
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"bytes"
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"runtime"
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@ -99,21 +97,13 @@ func OpenMMKV(vaultPath string, vaultKey string, logger *zap.Logger) error {
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return nil
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}
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func readKeyFromMMKVCustom(d *Decoder) ([]byte, error) {
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func readKeyFromMMKVCustom(mid string) ([]byte, error) {
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if streamKeyVault == nil {
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return nil, fmt.Errorf("mmkv vault not loaded")
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}
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// 获取mid即数据库键值
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_, err := d.raw.Seek(-128, io.SeekEnd)
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if err != nil {
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return nil, fmt.Errorf("get mid error: %w", err)
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}
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mid, err := io.ReadAll(io.LimitReader(d.raw, 64)) // 取64字节确保完全取完
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mid = bytes.ReplaceAll(mid, []byte{0x00}, []byte{}) // clean NUL
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mid = bytes.Trim(mid, "\0000") // maybe a little stupid
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// 从数据库获取eKey
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eKey, err := streamKeyVault.GetBytes(string(mid))
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// get ekey from mmkv vault
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eKey, err := streamKeyVault.GetBytes(mid)
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if err != nil {
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return nil, fmt.Errorf("get eKey error: %w", err)
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}
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@ -5,13 +5,12 @@ import (
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"encoding/binary"
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"errors"
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"fmt"
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"go.uber.org/zap"
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"io"
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"runtime"
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"strconv"
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"strings"
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"go.uber.org/zap"
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"unlock-music.dev/cli/algo/common"
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"unlock-music.dev/cli/internal/sniff"
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)
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@ -41,6 +40,8 @@ type Decoder struct {
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// provider
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logger *zap.Logger
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footer qqMusicTagMusicEx
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}
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// Read implements io.Reader, offer the decrypted audio data.
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@ -146,27 +147,16 @@ func (d *Decoder) searchKey() (err error) {
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case "STag":
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return errors.New("qmc: file with 'STag' suffix doesn't contains media key")
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case "cex\x00":
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d.decodedKey, err = readKeyFromMMKVCustom(d)
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if err == nil {
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suffix := []byte{0x63, 0x65, 0x78, 0x00} // cex
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for i := 0; i <= 3; i++ {
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// 末尾的信息数据每192字节出现一次,故只要循环判断末尾不为musicex时即为歌曲数据
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musicexLen, err := d.raw.Seek(int64(-(192*i)-4), io.SeekEnd)
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if err != nil {
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return fmt.Errorf("get musicexLen error: %w", err)
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}
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buf, err := io.ReadAll(io.LimitReader(d.raw, 4))
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if err != nil {
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return fmt.Errorf("get musicex error: %w", err)
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}
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if !bytes.Equal(buf, suffix) {
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d.audioLen = int(musicexLen) + 4
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return nil
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}
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}
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audioLen, err := d.footer.Read(d.raw)
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if err != nil {
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return err
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}
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return err
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d.audioLen = int(audioLen)
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d.decodedKey, err = readKeyFromMMKVCustom(d.footer.mediafile)
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if err != nil {
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return err
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}
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return nil
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default:
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size := binary.LittleEndian.Uint32(suffixBuf)
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63
algo/qmc/qmc_footer.go
Normal file
63
algo/qmc/qmc_footer.go
Normal file
@ -0,0 +1,63 @@
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package qmc
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import (
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"encoding/binary"
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"fmt"
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"io"
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)
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type qqMusicTagMusicEx struct {
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songid uint32 // Song ID
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unknown_1 uint32 // unused & unknown
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unknown_2 uint32 // unused & unknown
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mid string // Media ID
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mediafile string // real file name
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unknown_3 uint32 // unused; uninitialized memory?
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sizeof_struct uint32 // 19.57: fixed value: 0xC0
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version uint32 // 19.57: fixed value: 0x01
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tag_magic []byte // fixed value "musicex\0" (8 bytes)
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}
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func (tag *qqMusicTagMusicEx) Read(raw io.ReadSeeker) (int64, error) {
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_, err := raw.Seek(-16, io.SeekEnd)
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if err != nil {
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return 0, fmt.Errorf("musicex seek error: %w", err)
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}
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footerBuf := make([]byte, 4)
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footerBuf, err = io.ReadAll(io.LimitReader(raw, 4))
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if err != nil {
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return 0, fmt.Errorf("get musicex error: %w", err)
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}
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footerLen := int64(binary.LittleEndian.Uint32(footerBuf))
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audioLen, err := raw.Seek(-footerLen, io.SeekEnd)
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buf, err := io.ReadAll(io.LimitReader(raw, audioLen))
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if err != nil {
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return 0, err
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}
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tag.songid = binary.LittleEndian.Uint32(buf[0:4])
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tag.unknown_1 = binary.LittleEndian.Uint32(buf[4:8])
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tag.unknown_2 = binary.LittleEndian.Uint32(buf[8:12])
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for i := 0; i < 30; i++ {
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u := binary.LittleEndian.Uint16(buf[12+i*2 : 12+(i+1)*2])
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if u != 0 {
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tag.mid += string(u)
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}
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}
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for i := 0; i < 50; i++ {
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u := binary.LittleEndian.Uint16(buf[72+i*2 : 72+(i+1)*2])
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if u != 0 {
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tag.mediafile += string(u)
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}
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}
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tag.unknown_3 = binary.LittleEndian.Uint32(buf[173:177])
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tag.sizeof_struct = binary.LittleEndian.Uint32(buf[177:181])
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tag.version = binary.LittleEndian.Uint32(buf[181:185])
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tag.tag_magic = buf[185:193]
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return audioLen, nil
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}
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