some untested implementations for moore artnet packet types

command.go

@@ -0,0 +1,88 @@
+package artnet
+
+import (
+	"encoding/binary"
+	"errors"
+	"slices"
+)
+
+type ArtCommand struct {
+	ID        [8]uint8
+	OpCode    uint16
+	ProtVerHi uint8
+	ProtVerLo uint8
+	EstaManHi uint8
+	EstaManLo uint8
+	LengthHi  uint8
+	LengthLo  uint8
+	Data      []uint8
+}
+
+func (ap *ArtCommand) GetOpCode() uint16 {
+	return ap.OpCode
+}
+
+func (ap *ArtCommand) GetProtVer() uint16 {
+	return uint16(ap.ProtVerHi)<<8 + uint16(ap.ProtVerLo)
+}
+
+func (ap *ArtCommand) GetID() [8]uint8 {
+	return ap.ID
+}
+
+func (ap *ArtCommand) SetData(data string) error {
+	if len(data) > 512 {
+		return errors.New("data length must be less than or equal to 512 bytes")
+	}
+	ap.Data = make([]uint8, len(data))
+	copy(ap.Data, data)
+	ap.LengthHi = uint8(len(data) >> 8)
+	ap.LengthLo = uint8(len(data) & 0xff)
+	return nil
+}
+
+func (ap *ArtCommand) UnmarshalBinary(data []byte) error {
+
+	if len(data) < 16 {
+		return errors.New("ArtCommand packet must be at least 16 bytes long")
+	}
+
+	copy(ap.ID[:], data[0:8])
+
+	if !slices.Equal(ArtNetID[:], ap.ID[:]) {
+		return errors.New("ID does not match Art-Net ID")
+	}
+
+	ap.OpCode = binary.LittleEndian.Uint16(data[8:10])
+	ap.ProtVerHi = data[10]
+	ap.ProtVerLo = data[11]
+
+	offset := 12
+	ap.EstaManHi = data[offset]
+	ap.EstaManLo = data[offset+1]
+	ap.LengthHi = data[offset+2]
+	ap.LengthLo = data[offset+3]
+
+	dataLength := int(ap.LengthHi)<<8 + int(ap.LengthLo)
+
+	if len(data[offset+4:]) < dataLength {
+		return errors.New("[]byte length not long enough to contain data length specified in packet")
+	}
+	ap.Data = make([]uint8, dataLength)
+	copy(ap.Data, data[offset+4:offset+4+dataLength])
+	return nil
+}
+
+func (ap *ArtCommand) MarshalBinary() ([]byte, error) {
+	data := make([]byte, 8+8)
+	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.EstaManHi
+	data[13] = ap.EstaManLo
+	data[14] = ap.LengthHi
+	data[15] = ap.LengthLo
+	data = append(data, ap.Data...)
+	return data, nil
+}