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| author | Eric S. Raymond <esr@thyrsus.com> | 2013-10-14 07:42:40 -0400 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2013-10-14 07:42:40 -0400 |
| commit | 119308bff984bc83741c22a78ab3074a8c6278de (patch) | |
| tree | 2d5018dd1027089e90675b482cac6484a46c0b24 /driver_ais.c | |
| parent | ad8f509d4808b9564dae4493178cb41bb1e41bf9 (diff) | |
| download | gpsd-119308bff984bc83741c22a78ab3074a8c6278de.tar.gz | |
Be more relaxed about AIS Type 5 message lengths.
Diffstat (limited to 'driver_ais.c')
| -rw-r--r-- | driver_ais.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/driver_ais.c b/driver_ais.c index cd43a789..b1d1bc27 100644 --- a/driver_ais.c +++ b/driver_ais.c @@ -139,7 +139,12 @@ bool ais_binary_decode(const int debug, gpsd_report(debug, LOG_WARN, "AIVDM message type 5 size not 424 bits (%zd).\n", bitlen); - return false; + /* + * For unknown reasons, a lot of transmitters in the wild ship + * with a length of 420 or 422. This is a recoverable error. + */ + if (bitlen < 420) + return false; } ais->type5.ais_version = UBITS(38, 2); ais->type5.imo = UBITS(40, 30); @@ -157,7 +162,8 @@ bool ais_binary_decode(const int debug, ais->type5.minute = UBITS(288, 6); ais->type5.draught = UBITS(294, 8); UCHARS(302, ais->type5.destination); - ais->type5.dte = UBITS(422, 1); + if (bitlen >= 423) + ais->type5.dte = UBITS(422, 1); //ais->type5.spare = UBITS(423, 1); break; case 6: /* Addressed Binary Message */ |