// Parse will read as many packets as possible, outputting them on the channel.
func (s *PacketParser) Parse() (parsed int) {
for {
if s.buf.Len() < 3 {
return
}
b := s.buf.Bytes()
if b[0] != 0x02 && b[0] != 0x04 {
// observed packets always begin with 0x02, assume a desync
fmt.Printf("desync; truncating with buf: %s\n", humanhex.String(b, 3))
s.buf.Reset()
return
}
l := (int(b[1]) << 8) + int(b[2])
if s.buf.Len() < (l + 4) {
return
}
// header is 3 bytes, plus 1 byte checksum
d := make([]byte, l+4)
s.buf.Read(d)
s.ch <- NewRawPacket(d)
parsed++
}
}
// String returns a dump of the packet data
func (p *RawPacket) String() string {
return fmt.Sprintf("%v -> %v %v %s",
p.From, p.To, p.Kind, humanhex.String(p.Payload, 3))
}