Function AppendCFList

pkg/encoding/lorawan/messages.go:227–261

AppendCFList appends encoded msg to dst.

(dst []byte, msg *ttnpb.CFList)

// AppendCFList appends encoded msg to dst.
func AppendCFList(dst []byte, msg *ttnpb.CFList) ([]byte, error) {
	switch msg.Type {
	case 0:
		n := len(msg.Freq)
		if n > 5 {
			return nil, errExpectedLengthLowerOrEqual("CFListFreq", 5)(n)
		}
		for _, freq := range msg.Freq {
			if freq > byteutil.MaxUint24 {
				return nil, errMaxCFListFrequency(freq)
			}
			dst = byteutil.AppendUint32(dst, freq, 3)
		}
		// Fill remaining space with zeros.
		dst = append(dst, bytes.Repeat([]byte{0x0}, 15-n*3)...)
	case 1:
		n := uint(len(msg.ChMasks))
		if n > 96 {
			return nil, errExpectedLengthLowerOrEqual("CFListChMasks", 96)(n)
		}
		for i := uint(0); i < n; i += 8 {
			var b byte
			for j := uint(0); j < 8 && i+j < n; j++ {
				if msg.ChMasks[i+j] {
					b |= (1 << j)
				}
			}
			dst = append(dst, b)
		}
		// Fill remaining space with zeros.
		dst = append(dst, bytes.Repeat([]byte{0x0}, int(15-(n+7)/8))...)
	}
	dst = append(dst, byte(msg.Type))
	return dst, nil
}

// MarshalCFList returns encoded msg.
func MarshalCFList(msg *ttnpb.CFList) ([]byte, error) {