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vdmvdo.go
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package nmea
const (
// TypeVDM type for VDM sentences
TypeVDM = "VDM"
// TypeVDO type for VDO sentences
TypeVDO = "VDO"
)
// VDMVDO is a format used to encapsulate generic binary payloads. It is most commonly used
// with AIS data.
// http://catb.org/gpsd/AIVDM.html
type VDMVDO struct {
BaseSentence
NumFragments int64
FragmentNumber int64
MessageID int64
Channel string
Payload []byte
}
func (s VDMVDO) ToMap() (map[string]interface{}, error) {
m := map[string]interface{}{
"num_fragments": s.NumFragments,
"fragment_number": s.FragmentNumber,
"message_id": s.MessageID,
"channel": s.Channel,
"payload": s.Payload,
}
bm, err := s.BaseSentence.toMap()
if err != nil {
return m, err
}
for k, v := range bm {
m[k] = v
}
return m, nil
}
// newVDMVDO constructor
func newVDMVDO(s BaseSentence) (VDMVDO, error) {
p := NewParser(s)
m := VDMVDO{
BaseSentence: s,
NumFragments: p.Int64(0, "number of fragments"),
FragmentNumber: p.Int64(1, "fragment number"),
MessageID: p.Int64(2, "sequence number"),
Channel: p.String(3, "channel ID"),
Payload: p.SixBitASCIIArmour(4, int(p.Int64(5, "number of padding bits")), "payload"),
}
return m, p.Err()
}