mirror
/
stratux
kopia lustrzana https://github.com/cyoung/stratux
1
0
Forkuj 0
Kod Zgłoszenia Projekty Wydania Wiki Aktywność

Decode all time formats.

pull/226/head
Christopher Young 2015-12-13 19:52:59 -05:00
rodzic afe4d08ddf
commit 428345735a
1 zmienionych plików z 60 dodań i 18 usunięć
Pokaż statystyki Ściągnij plik aktualizacji Ściągnij plik porównania Expand all files Collapse all files

78
uatparse/uatparse.go
Wyświetl plik

@ -29,8 +29,13 @@ const (
type UATFrame struct {
Raw_data []byte
FISB_data []byte
FISB_month uint32
FISB_day uint32
FISB_hours uint32
FISB_minutes uint32
FISB_seconds uint32
FISB_length uint32
frame_length uint32
Frame_type uint32
@ -82,6 +87,59 @@ func dlac_decode(data []byte, data_len uint32) string {
return ret
}
// Decodes the time format and aligns 'FISB_data' accordingly.
//TODO: Make a new "FISB Time" structure that also encodes the type of timestamp received.
//TODO: pass up error.
func (f *UATFrame) decodeTimeFormat() {
t_opt := ((uint32(f.Raw_data[1]) & 0x01) << 1) | (uint32(f.Raw_data[2]) >> 7)
var fisb_data []byte
switch t_opt {
case 0: // Hours, Minutes.
if f.frame_length < 4 {
return
}
f.FISB_hours = (uint32(f.Raw_data[2]) & 0x7c) >> 2
f.FISB_minutes = ((uint32(f.Raw_data[2]) & 0x03) << 4) | (uint32(f.Raw_data[3]) >> 4)
f.FISB_length = f.frame_length - 4
fisb_data = f.Raw_data[4:]
case 1: // Hours, Minutes, Seconds.
if f.frame_length < 5 {
return
}
f.FISB_hours = (uint32(f.Raw_data[2]) & 0x7c) >> 2
f.FISB_minutes = ((uint32(f.Raw_data[2]) & 0x03) << 4) | (uint32(f.Raw_data[3]) >> 4)
f.FISB_seconds = ((uint32(f.Raw_data[3]) & 0x0f) << 2) | (uint32(f.Raw_data[4]) >> 6)
f.FISB_length = f.frame_length - 5
fisb_data = f.Raw_data[5:]
case 2: // Month, Day, Hours, Minutes.
if f.frame_length < 5 {
return
}
f.FISB_month = (uint32(f.Raw_data[2]) & 0x78) >> 3
f.FISB_day = ((uint32(f.Raw_data[2]) & 0x07) << 2) | (uint32(f.Raw_data[3]) >> 6)
f.FISB_hours = (uint32(f.Raw_data[3]) & 0x3e) >> 1
f.FISB_minutes = ((uint32(f.Raw_data[3]) & 0x01) << 5) | (uint32(f.Raw_data[4]) >> 3)
f.FISB_length = f.frame_length - 5
fisb_data = f.Raw_data[5:]
case 3: // Month, Day, Hours, Minutes, Seconds.
if f.frame_length < 6 {
return
}
f.FISB_month = (uint32(f.Raw_data[2]) & 0x78) >> 3
f.FISB_day = ((uint32(f.Raw_data[2]) & 0x07) << 2) | (uint32(f.Raw_data[3]) >> 6)
f.FISB_hours = (uint32(f.Raw_data[3]) & 0x3e) >> 1
f.FISB_minutes = ((uint32(f.Raw_data[3]) & 0x01) << 5) | (uint32(f.Raw_data[4]) >> 3)
f.FISB_seconds = ((uint32(f.Raw_data[4]) & 0x03) << 3) | (uint32(f.Raw_data[5]) >> 5)
f.FISB_length = f.frame_length - 6
fisb_data = f.Raw_data[6:]
default:
return // Should never reach this.
}
f.FISB_data = fisb_data
}
func (f *UATFrame) decodeInfoFrame() {
f.Product_id = ((uint32(f.Raw_data[0]) & 0x1f) << 6) | (uint32(f.Raw_data[1]) >> 2)
@ -89,30 +147,14 @@ func (f *UATFrame) decodeInfoFrame() {
if f.Frame_type != 0 {
return // Not FIS-B.
}
if f.frame_length < 4 {
return // Too short for FIS-B.
}
t_opt := ((uint32(f.Raw_data[1]) & 0x01) << 1) | (uint32(f.Raw_data[2]) >> 7)
if t_opt != 0 { //FIXME.
// fmt.Printf("don't know time format %d\n", t_opt)
// panic("time format")
return
}
f.FISB_hours = (uint32(f.Raw_data[2]) & 0x7c) >> 2
f.FISB_minutes = ((uint32(f.Raw_data[2]) & 0x03) << 4) | (uint32(f.Raw_data[3]) >> 4)
fisb_length := f.frame_length - 4
fisb_data := f.Raw_data[4:]
f.FISB_data = fisb_data
f.decodeTimeFormat()
if f.Product_id != 413 { // Doesn't have text data that we'd be interested in, so we're done.
return
}
p := dlac_decode(fisb_data, fisb_length)
p := dlac_decode(f.FISB_data, f.FISB_length)
ret := make([]string, 0)
for {
pos := strings.Index(p, "\x1E")