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83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
// AIS message 4 or 11
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#include "ais.h"
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namespace libais {
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Ais4_11::Ais4_11(const char *nmea_payload, const size_t pad)
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: AisMsg(nmea_payload, pad), year(0), month(0), day(0), hour(0), minute(0),
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second(0), position_accuracy(0), fix_type(0),
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transmission_ctl(0), spare(0), raim(false), sync_state(0),
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slot_timeout(0), received_stations_valid(false), received_stations(0),
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slot_number_valid(false), slot_number(0), utc_valid(false), utc_hour(0),
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utc_min(0), utc_spare(0), slot_offset_valid(false), slot_offset(0) {
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if (!CheckStatus()) {
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return;
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}
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if (pad != 0 || num_chars != 28) {
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status = AIS_ERR_BAD_BIT_COUNT;
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return;
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}
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assert(message_id == 4 || message_id == 11);
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bits.SeekTo(38);
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year = bits.ToUnsignedInt(38, 14);
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month = bits.ToUnsignedInt(52, 4);
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day = bits.ToUnsignedInt(56, 5);
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hour = bits.ToUnsignedInt(61, 5);
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minute = bits.ToUnsignedInt(66, 6);
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second = bits.ToUnsignedInt(72, 6);
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position_accuracy = bits[78];
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position = bits.ToAisPoint(79, 55);
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fix_type = bits.ToUnsignedInt(134, 4);
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transmission_ctl = bits[138];
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spare = bits.ToUnsignedInt(139, 9);
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raim = bits[148];
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// SOTDMA commstate
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sync_state = bits.ToUnsignedInt(149, 2);
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slot_timeout = bits.ToUnsignedInt(151, 3);
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switch (slot_timeout) {
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case 0:
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slot_offset = bits.ToUnsignedInt(154, 14);
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slot_offset_valid = true;
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break;
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case 1:
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utc_hour = bits.ToUnsignedInt(154, 5);
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utc_min = bits.ToUnsignedInt(159, 7);
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utc_spare = bits.ToUnsignedInt(166, 2);
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utc_valid = true;
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break;
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case 2: // FALLTHROUGH
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case 4: // FALLTHROUGH
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case 6:
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slot_number = bits.ToUnsignedInt(154, 14);
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slot_number_valid = true;
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break;
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case 3: // FALLTHROUGH
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case 5: // FALLTHROUGH
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case 7:
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received_stations = bits.ToUnsignedInt(154, 14);
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received_stations_valid = true;
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break;
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default:
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assert(false);
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}
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assert(bits.GetRemaining() == 0);
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status = AIS_OK;
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}
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#if 0
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ostream& operator<< (ostream &o, const Ais4_11 &msg) {
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return o << msg.message_id << ": " << msg.mmsi;
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}
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#endif
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} // namespace libais
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