4 files changed, 24 insertions, 19 deletions
diff --git a/danmaku/dmpkg/auth.go b/danmaku/dmpkg/auth.go
index c39fbd9..5caf868 100644
--- a/danmaku/dmpkg/auth.go
+++ b/danmaku/dmpkg/auth.go
@@ -23,11 +23,11 @@ type authInfo struct {
 // NewAuth creates a new authentication exchange.
 func NewAuth(protocol ProtocolVer, roomId common.RoomId, authKey string) (exc DanmakuExchange) {
 	exc, _ = NewPlainExchange(OpConnect, authInfo{
-		UID:      kUidGuest,
+		UID:      UidGuest,
 		RoomId:   uint64(roomId),
 		ProtoVer: int(protocol),
-		Platform: kPlatformWeb,
-		Type:     kAuthTypeDefault,
+		Platform: PlatformWeb,
+		Type:     AuthTypeDefault,
 		Key:      authKey,
 	})
 	return
diff --git a/danmaku/dmpkg/decode.go b/danmaku/dmpkg/decode.go
index 7d9f796..e352fcc 100644
--- a/danmaku/dmpkg/decode.go
+++ b/danmaku/dmpkg/decode.go
@@ -7,14 +7,14 @@ import (
 )
 
 func DecodeExchange(data []byte) (exc DanmakuExchange, err error) {
-	if ln := len(data); ln < kHeaderLength {
-		err = fmt.Errorf("incomplete datagram: length = %v < %v", ln, kHeaderLength)
+	if ln := len(data); ln < HeaderLength {
+		err = fmt.Errorf("incomplete datagram: length = %v < %v", ln, HeaderLength)
 		return
 	}
 
 	// unpack header
 	var exchangeHeader DanmakuExchangeHeader
-	err = struc.Unpack(bytes.NewReader(data[:kHeaderLength]), &exchangeHeader)
+	err = struc.Unpack(bytes.NewReader(data[:HeaderLength]), &exchangeHeader)
 	if err != nil {
 		err = fmt.Errorf("cannot unpack exchange header: %w", err)
 		return
@@ -22,9 +22,9 @@ func DecodeExchange(data []byte) (exc DanmakuExchange, err error) {
 	headerLength := exchangeHeader.HeaderLength
 
 	// validate header length, fail fast if not match
-	if headerLength != kHeaderLength {
+	if headerLength != HeaderLength {
 		err = fmt.Errorf("invalid header length, "+
-			"the protocol implementation might be obsolete: %v != %v", headerLength, kHeaderLength)
+			"the protocol implementation might be obsolete: %v != %v", headerLength, HeaderLength)
 		return
 	}
 
diff --git a/danmaku/dmpkg/package.go b/danmaku/dmpkg/package.go
index 3175a18..51c769a 100644
--- a/danmaku/dmpkg/package.go
+++ b/danmaku/dmpkg/package.go
@@ -31,8 +31,10 @@ func (e *DanmakuExchange) String() string {
 		e.Length, e.ProtocolVer, e.Operation, e.Body)
 }
 
-const kHeaderLength = 16
-const kSequenceId = 1
+const (
+	HeaderLength = 16
+	SequenceId   = 1
+)
 
 type ProtocolVer uint16
 
@@ -47,9 +49,12 @@ const (
 	ProtoBrotli ProtocolVer = 3
 )
 
-const kUidGuest = 0
-const kPlatformWeb = "web"
-const kAuthTypeDefault = 2 // magic number, not sure what does it mean
+const (
+	UidGuest    = 0
+	PlatformWeb = "web"
+	// AuthTypeDefault magic number, not sure what does it mean
+	AuthTypeDefault = 2
+)
 
 func (e *DanmakuExchange) Marshal() (data []byte, err error) {
 	var buffer bytes.Buffer
diff --git a/danmaku/dmpkg/raw.go b/danmaku/dmpkg/raw.go
index 17b538a..34cd2e6 100644
--- a/danmaku/dmpkg/raw.go
+++ b/danmaku/dmpkg/raw.go
@@ -6,7 +6,7 @@ import (
 	"math"
 )
 
-const kMaxBodyLength = math.MaxUint32 - uint64(kHeaderLength)
+const MaxBodyLength = math.MaxUint32 - uint64(HeaderLength)
 
 // NewPlainExchange creates a new exchange with raw body specified.
 // body: a struct or a raw string
@@ -28,18 +28,18 @@ func NewPlainExchange(operation Operation, body interface{}) (exc DanmakuExchang
 		}
 	}
 
-	length := uint64(kHeaderLength + len(bodyData))
-	if length > kMaxBodyLength {
-		err = fmt.Errorf("body is too large (> %d)", kMaxBodyLength)
+	length := uint64(HeaderLength + len(bodyData))
+	if length > MaxBodyLength {
+		err = fmt.Errorf("body is too large (> %d)", MaxBodyLength)
 		return
 	}
 	exc = DanmakuExchange{
 		DanmakuExchangeHeader: DanmakuExchangeHeader{
 			Length:       uint32(length),
-			HeaderLength: kHeaderLength,
+			HeaderLength: HeaderLength,
 			ProtocolVer:  ProtoPlainJson,
 			Operation:    operation,
-			SequenceId:   kSequenceId,
+			SequenceId:   SequenceId,
 		},
 		Body: bodyData,
 	}