some byte slice cleanup

artnet.go

@@ -47,7 +47,7 @@ var (
 	OpDirectoryReply   uint16 = 0x9b00
 )
 
-var ArtNetID []uint8 = []uint8{'A', 'r', 't', '-', 'N', 'e', 't', 0x00}
+var ArtNetID [8]uint8 = [8]uint8{'A', 'r', 't', '-', 'N', 'e', 't', 0x00}
 
 func Decode(bytes []byte) (ArtNetPacket, error) {
 	if len(bytes) < 12 {
@@ -56,11 +56,35 @@ func Decode(bytes []byte) (ArtNetPacket, error) {
 	opCode := binary.LittleEndian.Uint16(bytes[8:10])
 	switch opCode {
 	case OpPoll:
-		return NewArtPoll(bytes)
+		artPoll := ArtPoll{}
+
+		err := artPoll.UnmarshalBinary(bytes)
+
+		if err != nil {
+			return nil, err
+		}
+
+		return &artPoll, nil
 	case OpDmx:
-		return NewArtDmx(bytes)
+		artDmx := ArtDmx{}
+
+		err := artDmx.UnmarshalBinary(bytes)
+
+		if err != nil {
+			return nil, err
+		}
+
+		return &artDmx, nil
 	case OpTimeCode:
-		return NewArtTimeCode(bytes)
+		artTimeCode := ArtTimeCode{}
+
+		err := artTimeCode.UnmarshalBinary(bytes)
+
+		if err != nil {
+			return nil, err
+		}
+
+		return &artTimeCode, nil
 	default:
 		return nil, fmt.Errorf("unhandled opcode: %#x", opCode)
 	}

dmx.go

@@ -7,7 +7,7 @@ import (
 )
 
 type ArtDmx struct {
-	ID        []uint8
+	ID        [8]uint8
 	OpCode    uint16
 	ProtVerHi uint8
 	ProtVerLo uint8
@@ -15,22 +15,9 @@ type ArtDmx struct {
 	Physical  uint8
 	SubUni    uint8
 	Net       uint8
-	Length    uint16
 	Data      []uint8
 }
 
-func NewArtDmx(data []byte) (*ArtDmx, error) {
-	artDmx := ArtDmx{}
-
-	err := artDmx.UnmarshalBinary(data)
-
-	if err != nil {
-		return nil, err
-	}
-
-	return &artDmx, nil
-}
-
 func (ad *ArtDmx) GetOpCode() uint16 {
 	return ad.OpCode
 }
@@ -39,18 +26,22 @@ func (ad *ArtDmx) GetProtVer() uint16 {
 	return uint16(ad.ProtVerHi)<<8 + uint16(ad.ProtVerLo)
 }
 
-func (ad *ArtDmx) GetID() []uint8 {
+func (ad *ArtDmx) GetID() [8]uint8 {
 	return ad.ID
 }
 
+func (ad *ArtDmx) Length() uint16 {
+	return uint16(len(ad.Data))
+}
+
 func (ad *ArtDmx) UnmarshalBinary(data []byte) error {
 	if len(data) < 18 {
 		return errors.New("ArtDmx packet must be at least 18 bytes long")
 	}
 
-	ad.ID = data[0:8]
+	copy(ad.ID[:], data[0:8])
 
-	if !slices.Equal(ArtNetID, ad.ID) {
+	if !slices.Equal(ArtNetID[:], ad.ID[:]) {
 		return errors.New("ID does not match Art-Net ID")
 	}
 
@@ -65,23 +56,30 @@ func (ad *ArtDmx) UnmarshalBinary(data []byte) error {
 	ad.SubUni = data[offset+2]
 	ad.Net = data[offset+3]
 
-	ad.Length = uint16(data[offset+4])<<8 + uint16(data[offset+5])
+	length := int(data[offset+4])<<8 + int(data[offset+5])
 
 	dmxDataOffset := offset + 6
 
-	if len(data[dmxDataOffset:]) < int(ad.Length) {
+	if len(data[dmxDataOffset:]) < length {
 		return errors.New("ArtDmx packet length mismatch")
 	}
 
-	ad.Data = make([]uint8, ad.Length)
+	ad.Data = data[dmxDataOffset : dmxDataOffset+length]
 
-	copy(ad.Data, data[dmxDataOffset:dmxDataOffset+int(ad.Length)])
 	return nil
 }
 
 func (ad *ArtDmx) MarshalBinary() ([]byte, error) {
-	data := []byte(ArtNetID)
+	data := make([]byte, 8+10+ad.Length())
-	data = append(data, byte(ad.OpCode), byte(ad.OpCode>>8), ad.ProtVerHi, ad.ProtVerLo, ad.Sequence, ad.Physical, ad.SubUni, ad.Net, byte(ad.Length>>8), byte(ad.Length))
+	copy(data[0:8], ad.ID[:])
-	data = append(data, ad.Data...)
+	binary.LittleEndian.PutUint16(data[8:10], ad.OpCode)
+	data[10] = ad.ProtVerHi
+	data[11] = ad.ProtVerLo
+	data[12] = ad.Sequence
+	data[13] = ad.Physical
+	data[14] = ad.SubUni
+	data[15] = ad.Net
+	binary.BigEndian.PutUint16(data[16:18], ad.Length())
+	copy(data[18:], ad.Data)
 	return data, nil
 }

dmx_test.go

@@ -15,7 +15,7 @@ func TestGoodArtDmx(t *testing.T) {
 		{
 			Data: []byte{65, 114, 116, 45, 78, 101, 116, 0, 0, 80, 0, 14, 237, 0, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
 			Expected: &artnet.ArtDmx{
-				ID:        []byte{'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
+				ID:        [8]byte{'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
 				OpCode:    artnet.OpDmx,
 				ProtVerHi: 0,
 				ProtVerLo: 14,
@@ -23,14 +23,15 @@ func TestGoodArtDmx(t *testing.T) {
 				Physical:  0,
 				SubUni:    1,
 				Net:       0,
-				Length:    512,
 				Data:      make([]uint8, 512),
 			},
 		},
 	}
 
 	for _, test := range tests {
-		got, err := artnet.NewArtDmx(test.Data)
+		got := artnet.ArtDmx{}
+
+		err := got.UnmarshalBinary(test.Data)
 
 		if err != nil {
 			t.Fatalf("failed to decode ArtDmx: %s", err)
@@ -40,7 +41,7 @@ func TestGoodArtDmx(t *testing.T) {
 			t.Fatalf("ArtDmx OpCode does not match got: %d expected: %d", got.OpCode, test.Expected.OpCode)
 		}
 
-		if !slices.Equal(got.ID, test.Expected.ID) {
+		if !slices.Equal(got.ID[:], test.Expected.ID[:]) {
 			t.Fatalf("ArtDmx ID does not match got: %+v expected: %+v", got.ID, test.Expected.ID)
 		}
 
@@ -68,8 +69,8 @@ func TestGoodArtDmx(t *testing.T) {
 			t.Fatalf("ArtDmx Net does not match got: %d expected: %d", got.Net, test.Expected.Net)
 		}
 
-		if got.Length != test.Expected.Length {
+		if got.Length() != test.Expected.Length() {
-			t.Fatalf("ArtDmx Length does not match got: %d expected: %d", got.Length, test.Expected.Length)
+			t.Fatalf("ArtDmx Length does not match got: %d expected: %d", got.Length(), test.Expected.Length())
 		}
 
 		if !slices.Equal(got.Data, test.Expected.Data) {
@@ -78,3 +79,37 @@ func TestGoodArtDmx(t *testing.T) {
 
 	}
 }
+
+func BenchmarkArtDmxUnmarshalBinary(b *testing.B) {
+	data := []byte{65, 114, 116, 45, 78, 101, 116, 0, 0, 80, 0, 14, 237, 0, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
+
+	for b.Loop() {
+		got := artnet.ArtDmx{}
+
+		err := got.UnmarshalBinary(data)
+		if err != nil {
+			b.Fatalf("failed to decode ArtDmx: %s", err)
+		}
+	}
+}
+
+func BenchmarkArtDmxMarshalBinary(b *testing.B) {
+	data := artnet.ArtDmx{
+		ID:        [8]byte{'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
+		OpCode:    artnet.OpDmx,
+		ProtVerHi: 0,
+		ProtVerLo: 14,
+		Sequence:  237,
+		Physical:  0,
+		SubUni:    1,
+		Net:       0,
+		Data:      make([]uint8, 512),
+	}
+
+	for b.Loop() {
+		_, err := data.MarshalBinary()
+		if err != nil {
+			b.Fatalf("failed to encode ArtDmx: %s", err)
+		}
+	}
+}

packet.go

@@ -9,5 +9,5 @@ type ArtNetPacket interface {
 	encoding.BinaryMarshaler
 	GetOpCode() uint16
 	GetProtVer() uint16
-	GetID() []uint8
+	GetID() [8]uint8
 }

poll.go

@@ -7,7 +7,7 @@ import (
 )
 
 type ArtPoll struct {
-	ID              []uint8
+	ID              [8]uint8
 	OpCode          uint16
 	ProtVerHi       uint8
 	ProtVerLo       uint8
@@ -23,18 +23,6 @@ type ArtPoll struct {
 	OemLo           uint8
 }
 
-func NewArtPoll(data []byte) (*ArtPoll, error) {
-	artPoll := ArtPoll{}
-
-	err := artPoll.UnmarshalBinary(data)
-
-	if err != nil {
-		return nil, err
-	}
-
-	return &artPoll, nil
-}
-
 func (ap *ArtPoll) GetOpCode() uint16 {
 	return ap.OpCode
 }
@@ -43,7 +31,7 @@ func (ap *ArtPoll) GetProtVer() uint16 {
 	return uint16(ap.ProtVerHi)<<8 + uint16(ap.ProtVerLo)
 }
 
-func (ap *ArtPoll) GetID() []uint8 {
+func (ap *ArtPoll) GetID() [8]uint8 {
 	return ap.ID
 }
 
@@ -53,9 +41,9 @@ func (ap *ArtPoll) UnmarshalBinary(data []byte) error {
 		return errors.New("ArtPoll packet must be at least 14 bytes long")
 	}
 
-	ap.ID = data[0:8]
+	copy(ap.ID[:], data[0:8])
 
-	if !slices.Equal(ArtNetID, ap.ID) {
+	if !slices.Equal(ArtNetID[:], ap.ID[:]) {
 		return errors.New("ID does not match Art-Net ID")
 	}
 
@@ -71,8 +59,13 @@ func (ap *ArtPoll) UnmarshalBinary(data []byte) error {
 }
 
 func (ap *ArtPoll) MarshalBinary() ([]byte, error) {
-	data := []byte(ArtNetID)
+	data := make([]byte, 8+6)
-	data = append(data, byte(ap.OpCode), byte(ap.OpCode>>8), ap.ProtVerHi, ap.ProtVerLo, ap.Flags, ap.DiagPriority)
+	copy(data[0:8], ap.ID[:])
+	binary.LittleEndian.PutUint16(data[8:10], ap.OpCode)
+	data[10] = ap.ProtVerHi
+	data[11] = ap.ProtVerLo
+	data[12] = ap.Flags
+	data[13] = ap.DiagPriority
 	//TODO(jwetzell): pack extended poll fields
 	return data, nil
 }

timecode.go

@@ -7,7 +7,7 @@ import (
 )
 
 type ArtTimeCode struct {
-	ID        []uint8
+	ID        [8]uint8
 	OpCode    uint16
 	ProtVerHi uint8
 	ProtVerLo uint8
@@ -20,18 +20,6 @@ type ArtTimeCode struct {
 	Type      uint8
 }
 
-func NewArtTimeCode(data []byte) (*ArtTimeCode, error) {
-	artTimeCode := ArtTimeCode{}
-
-	err := artTimeCode.UnmarshalBinary(data)
-
-	if err != nil {
-		return nil, err
-	}
-
-	return &artTimeCode, nil
-}
-
 func (atc *ArtTimeCode) GetOpCode() uint16 {
 	return atc.OpCode
 }
@@ -40,7 +28,7 @@ func (atc *ArtTimeCode) GetProtVer() uint16 {
 	return uint16(atc.ProtVerHi)<<8 + uint16(atc.ProtVerLo)
 }
 
-func (atc *ArtTimeCode) GetID() []uint8 {
+func (atc *ArtTimeCode) GetID() [8]uint8 {
 	return atc.ID
 }
 
@@ -49,9 +37,9 @@ func (atc *ArtTimeCode) UnmarshalBinary(data []byte) error {
 		return errors.New("ArtTimeCode packet must be at least 14 bytes long")
 	}
 
-	atc.ID = data[0:8]
+	copy(atc.ID[:], data[0:8])
 
-	if !slices.Equal(ArtNetID, atc.ID) {
+	if !slices.Equal(ArtNetID[:], atc.ID[:]) {
 		return errors.New("ID does not match Art-Net ID")
 	}
 
@@ -71,7 +59,18 @@ func (atc *ArtTimeCode) UnmarshalBinary(data []byte) error {
 }
 
 func (atc *ArtTimeCode) MarshalBinary() ([]byte, error) {
-	data := []byte(ArtNetID)
+	data := make([]byte, 8+11)
-	data = append(data, byte(atc.OpCode), byte(atc.OpCode>>8), atc.ProtVerHi, atc.ProtVerLo, atc.Filler1, atc.StreamId, atc.Frames, atc.Seconds, atc.Minutes, atc.Hours, atc.Type)
+	copy(data[0:8], atc.ID[:])
+	binary.LittleEndian.PutUint16(data[8:10], atc.OpCode)
+	data[10] = atc.ProtVerHi
+	data[11] = atc.ProtVerLo
+	offset := 12
+	data[offset] = atc.Filler1
+	data[offset+1] = atc.StreamId
+	data[offset+2] = atc.Frames
+	data[offset+3] = atc.Seconds
+	data[offset+4] = atc.Minutes
+	data[offset+5] = atc.Hours
+	data[offset+6] = atc.Type
 	return data, nil
 }

timecode_test.go

@@ -15,7 +15,7 @@ func TestGoodArtTimeCode(t *testing.T) {
 		{
 			Data: []byte{65, 114, 116, 45, 78, 101, 116, 0, 0, 151, 0, 14, 0, 0, 11, 17, 3, 0, 0},
 			Expected: &artnet.ArtTimeCode{
-				ID:        []byte{'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
+				ID:        [8]uint8{'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
 				OpCode:    artnet.OpTimeCode,
 				ProtVerHi: 0,
 				ProtVerLo: 14,
@@ -31,7 +31,9 @@ func TestGoodArtTimeCode(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		got, err := artnet.NewArtTimeCode(test.Data)
+		got := artnet.ArtTimeCode{}
+
+		err := got.UnmarshalBinary(test.Data)
 
 		if err != nil {
 			t.Fatalf("failed to decode ArtTimeCode: %s", err)
@@ -41,7 +43,7 @@ func TestGoodArtTimeCode(t *testing.T) {
 			t.Fatalf("ArtTimeCode OpCode does not match got: %d expected: %d", got.OpCode, test.Expected.OpCode)
 		}
 
-		if !slices.Equal(got.ID, test.Expected.ID) {
+		if !slices.Equal(got.ID[:], test.Expected.ID[:]) {
 			t.Fatalf("ArtTimeCode ID does not match got: %+v expected: %+v", got.ID, test.Expected.ID)
 		}
 
@@ -83,3 +85,39 @@ func TestGoodArtTimeCode(t *testing.T) {
 
 	}
 }
+
+func BenchmarkArtTimeCodeUnmarshalBinary(b *testing.B) {
+	data := []byte{65, 114, 116, 45, 78, 101, 116, 0, 0, 151, 0, 14, 0, 0, 11, 17, 3, 0, 0}
+
+	for b.Loop() {
+		got := artnet.ArtTimeCode{}
+
+		err := got.UnmarshalBinary(data)
+		if err != nil {
+			b.Fatalf("failed to decode ArtTimeCode: %s", err)
+		}
+	}
+}
+
+func BenchmarkArtTimeCodeMarshalBinary(b *testing.B) {
+	data := artnet.ArtTimeCode{
+		ID:        [8]uint8{'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
+		OpCode:    artnet.OpTimeCode,
+		ProtVerHi: 0,
+		ProtVerLo: 14,
+		Filler1:   0,
+		StreamId:  0,
+		Frames:    11,
+		Seconds:   17,
+		Minutes:   3,
+		Hours:     0,
+		Type:      0,
+	}
+
+	for b.Loop() {
+		_, err := data.MarshalBinary()
+		if err != nil {
+			b.Fatalf("failed to encode ArtTimeCode: %s", err)
+		}
+	}
+}