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remove length property and make it calculated

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This commit is contained in:
Joel Wetzell
2026-05-26 17:54:35 -05:00
parent 9546018fb7
commit 572fa39c16
2 changed files with 69 additions and 66 deletions
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command.go
+30 -34
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@@ -19,70 +19,66 @@ type ArtCommand struct {
ProtVerHi uint8
ProtVerLo uint8
EstaMan uint16
Length uint16
Data []uint8
}
func (ap *ArtCommand) GetOpCode() uint16 {
return ap.OpCode
func (ac *ArtCommand) GetOpCode() uint16 {
return ac.OpCode
}
func (ap *ArtCommand) GetProtVer() uint16 {
return uint16(ap.ProtVerHi)<<8 + uint16(ap.ProtVerLo)
func (ac *ArtCommand) GetProtVer() uint16 {
return uint16(ac.ProtVerHi)<<8 + uint16(ac.ProtVerLo)
}
func (ap *ArtCommand) GetID() [8]uint8 {
return ap.ID
func (ac *ArtCommand) GetID() [8]uint8 {
return ac.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.Length = uint16(len(data))
return nil
func (ac *ArtCommand) Length() uint16 {
return uint16(len(ac.Data))
}
func (ap *ArtCommand) UnmarshalBinary(data []byte) error {
func (ac *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])
copy(ac.ID[:], data[0:8])
if !slices.Equal(ArtNetID[:], ap.ID[:]) {
if !slices.Equal(ArtNetID[:], ac.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]
ac.OpCode = binary.LittleEndian.Uint16(data[8:10])
ac.ProtVerHi = data[10]
ac.ProtVerLo = data[11]
offset := 12
ap.EstaMan = binary.LittleEndian.Uint16(data[offset : offset+2])
ap.Length = binary.LittleEndian.Uint16(data[offset+2 : offset+4])
ac.EstaMan = binary.LittleEndian.Uint16(data[offset : offset+2])
dataLength := int(ap.Length)
dataLength := int(binary.LittleEndian.Uint16(data[offset+2 : offset+4]))
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])
ac.Data = make([]uint8, dataLength)
copy(ac.Data, data[offset+4:offset+4+dataLength])
return nil
}
func (ap *ArtCommand) MarshalBinary() ([]byte, error) {
func (ac *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
binary.LittleEndian.PutUint16(data[12:14], ap.EstaMan)
binary.LittleEndian.PutUint16(data[14:16], ap.Length)
data = append(data, ap.Data...)
copy(data[0:8], ac.ID[:])
binary.LittleEndian.PutUint16(data[8:10], ac.OpCode)
data[10] = ac.ProtVerHi
data[11] = ac.ProtVerLo
binary.LittleEndian.PutUint16(data[12:14], ac.EstaMan)
dataLength := uint16(len(ac.Data))
if dataLength > 512 {
return nil, errors.New("data length must be less than or equal to 512 bytes")
}
binary.LittleEndian.PutUint16(data[14:16], dataLength)
data = append(data, ac.Data...)
return data, nil
}