add ArtNzs

nzs.go

@@ -0,0 +1,86 @@
+package artnet
+
+import (
+	"encoding/binary"
+	"errors"
+	"slices"
+)
+
+type ArtNzs struct {
+	ID        [8]uint8
+	OpCode    uint16
+	ProtVerHi uint8
+	ProtVerLo uint8
+	Sequence  uint8
+	StartCode uint8
+	SubUni    uint8
+	Net       uint8
+	Data      []uint8
+}
+
+func (an *ArtNzs) GetOpCode() uint16 {
+	return an.OpCode
+}
+
+func (an *ArtNzs) GetProtVer() uint16 {
+	return uint16(an.ProtVerHi)<<8 + uint16(an.ProtVerLo)
+}
+
+func (an *ArtNzs) GetID() [8]uint8 {
+	return an.ID
+}
+
+func (an *ArtNzs) Length() uint16 {
+	return uint16(len(an.Data))
+}
+
+func (an *ArtNzs) UnmarshalBinary(data []byte) error {
+
+	if len(data) < 18 {
+		return errors.New("ArtNzs packet must be at least 18 bytes long")
+	}
+
+	copy(an.ID[:], data[0:8])
+
+	if !slices.Equal(ArtNetID[:], an.ID[:]) {
+		return errors.New("ID does not match Art-Net ID")
+	}
+
+	an.OpCode = binary.LittleEndian.Uint16(data[8:10])
+	an.ProtVerHi = data[10]
+	an.ProtVerLo = data[11]
+
+	offset := 12
+	an.Sequence = data[offset]
+	an.StartCode = data[offset+1]
+	an.SubUni = data[offset+2]
+	an.Net = data[offset+3]
+
+	dataLength := int(binary.LittleEndian.Uint16(data[offset+4 : offset+6]))
+
+	if len(data[offset+6:]) < dataLength {
+		return errors.New("[]byte length not long enough to contain data length specified in packet")
+	}
+	an.Data = make([]uint8, dataLength)
+	copy(an.Data, data[offset+6:offset+6+dataLength])
+	return nil
+}
+
+func (an *ArtNzs) MarshalBinary() ([]byte, error) {
+	data := make([]byte, 8+8)
+	copy(data[0:8], an.ID[:])
+	binary.LittleEndian.PutUint16(data[8:10], an.OpCode)
+	data[10] = an.ProtVerHi
+	data[11] = an.ProtVerLo
+	data[12] = an.Sequence
+	data[13] = an.StartCode
+	data[14] = an.SubUni
+	data[15] = an.Net
+	dataLength := uint16(len(an.Data))
+	if dataLength > 512 {
+		return nil, errors.New("data length must be less than or equal to 512 bytes")
+	}
+	binary.LittleEndian.PutUint16(data[16:18], dataLength)
+	copy(data[18:], an.Data)
+	return data, nil
+}