algo/kgm/kgm.go

@@ -8,20 +8,17 @@ import (
 )
 
 type Decoder struct {
-	rd io.ReadSeeker
-
-	cipher common.StreamDecoder
-	offset int
-
 	header header
+	cipher common.StreamDecoder
+
+	rd     io.ReadSeeker
+	offset int
 }
 
 func NewDecoder(rd io.ReadSeeker) common.Decoder {
 	return &Decoder{rd: rd}
 }
 
-// Validate checks if the file is a valid Kugou (.kgm, .vpr, .kgma) file.
-// rd will be seeked to the beginning of the encrypted audio.
 func (d *Decoder) Validate() (err error) {
 	if err := d.header.FromFile(d.rd); err != nil {
 		return err

algo/kwm/kwm.go

@@ -16,9 +16,9 @@ const magicHeader = "yeelion-kuwo-tme"
 const keyPreDefined = "MoOtOiTvINGwd2E6n0E1i7L5t2IoOoNk"
 
 type Decoder struct {
-	rd io.ReadSeeker
-
 	cipher common.StreamDecoder
+
+	rd     io.ReadSeeker
 	offset int
 
 	outputExt string
@@ -33,8 +33,6 @@ func NewDecoder(rd io.ReadSeeker) common.Decoder {
 	return &Decoder{rd: rd}
 }
 
-// Validate checks if the file is a valid Kuwo .kw file.
-// rd will be seeked to the beginning of the encrypted audio.
 func (d *Decoder) Validate() error {
 	header := make([]byte, 0x400) // kwm header is fixed to 1024 bytes
 	_, err := io.ReadFull(d.rd, header)

algo/ncm/ncm.go

@@ -36,19 +36,22 @@ func NewDecoder(rd io.ReadSeeker) common.Decoder {
 }
 
 type Decoder struct {
-	rd io.ReadSeeker // rd is the original file reader
-
+	rd     io.ReadSeeker
 	offset int
+
 	cipher common.StreamDecoder
 
+	key []byte
+	box []byte
+
 	metaRaw  []byte
 	metaType string
 	meta     RawMeta
+
 	cover []byte
+	audio []byte
 }
 
-// Validate checks if the file is a valid Netease .ncm file.
-// rd will be seeked to the beginning of the encrypted audio.
 func (d *Decoder) Validate() error {
 	if err := d.validateMagicHeader(); err != nil {
 		return err

algo/qmc/qmc.go

@@ -13,15 +13,14 @@ import (
 )
 
 type Decoder struct {
-	raw io.ReadSeeker // raw is the original file reader
+	raw      io.ReadSeeker
+	audio    io.Reader
+	offset   int
+	audioLen int
 
-	audio    io.Reader // audio is the encrypted audio data
-	audioLen int       // audioLen is the audio data length
-	offset   int       // offset is the current audio read position
-
-	decodedKey []byte // decodedKey is the decoded key for cipher
 	cipher common.StreamDecoder
 
+	decodedKey    []byte
 	rawMetaExtra1 int
 	rawMetaExtra2 int
 }
@@ -101,29 +100,23 @@ func (d *Decoder) searchKey() error {
 	if err != nil {
 		return err
 	}
-
-	suffixBuf := make([]byte, 4)
-	if _, err := io.ReadFull(d.raw, suffixBuf); err != nil {
+	buf, err := io.ReadAll(io.LimitReader(d.raw, 4))
+	if err != nil {
 		return err
 	}
-
-	switch string(suffixBuf) {
-	case "QTag":
+	if string(buf) == "QTag" {
 		return d.readRawMetaQTag()
-	case "STag":
+	} else if string(buf) == "STag" {
 		return errors.New("qmc: file with 'STag' suffix doesn't contains media key")
-	default:
-		size := binary.LittleEndian.Uint32(suffixBuf)
-
+	} else {
+		size := binary.LittleEndian.Uint32(buf)
 		if size <= 0xFFFF && size != 0 { // assume size is key len
 			return d.readRawKey(int64(size))
 		}
-
 		// try to use default static cipher
 		d.audioLen = int(fileSizeM4 + 4)
 		return nil
 	}
-
 }
 
 func (d *Decoder) readRawKey(rawKeyLen int64) error {

algo/tm/tm.go

@@ -13,10 +13,9 @@ var replaceHeader = []byte{0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70}
 var magicHeader = []byte{0x51, 0x51, 0x4D, 0x55} //0x15, 0x1D, 0x1A, 0x21
 
 type Decoder struct {
-	raw io.ReadSeeker // raw is the original file reader
-
+	raw    io.ReadSeeker
 	offset int
-	audio  io.Reader // audio is the decrypted audio data
+	audio  io.Reader
 }
 
 func (d *Decoder) Validate() error {

algo/xm/xm.go

@@ -1,4 +1,4 @@
-package xiami
+package xm
 
 import (
 	"bytes"
@@ -22,11 +22,13 @@ var (
 )
 
 type Decoder struct {
-	rd     io.ReadSeeker // rd is the original file reader
+	rd     io.ReadSeeker
 	offset int
 
 	cipher    common.StreamDecoder
 	outputExt string
+	mask      byte
+	audio     []byte
 }
 
 func (d *Decoder) GetAudioExt() string {
@@ -41,8 +43,6 @@ func NewDecoder(rd io.ReadSeeker) common.Decoder {
 	return &Decoder{rd: rd}
 }
 
-// Validate checks if the file is a valid xiami .xm file.
-// rd will set to the beginning of the encrypted audio data.
 func (d *Decoder) Validate() error {
 	header := make([]byte, 16) // xm header is fixed to 16 bytes
 

algo/xm/xm_cipher.go

@@ -1,4 +1,4 @@
-package xiami
+package xm
 
 type xmCipher struct {
 	mask           byte

cmd/um/main.go

@@ -22,7 +22,7 @@ import (
 	_ "unlock-music.dev/cli/algo/ncm"
 	_ "unlock-music.dev/cli/algo/qmc"
 	_ "unlock-music.dev/cli/algo/tm"
-	_ "unlock-music.dev/cli/algo/xiami"
+	_ "unlock-music.dev/cli/algo/xm"
 	"unlock-music.dev/cli/internal/logging"
 )
 

internal/logging/zap.go

@@ -7,7 +7,6 @@ import (
 
 func NewZapLogger() (*zap.Logger, error) {
 	zapCfg := zap.NewDevelopmentConfig()
-	zapCfg.DisableStacktrace = true
 	zapCfg.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
 	zapCfg.EncoderConfig.EncodeTime = zapcore.TimeEncoderOfLayout("2006/01/02 15:04:05.000")
 	return zapCfg.Build()