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65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
// Msg 22 - F - Channel Management
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#include "ais.h"
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namespace libais {
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Ais22::Ais22(const char *nmea_payload, const size_t pad)
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: AisMsg(nmea_payload, pad), spare(0), chan_a(0), chan_b(0), txrx_mode(0),
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power_low(false), pos_valid(false), dest_valid(false), dest_mmsi_1(0),
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dest_mmsi_2(0), chan_a_bandwidth(0), chan_b_bandwidth(0), zone_size(0),
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spare2(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 == 22);
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spare = bits.SeekTo(38).ToUnsignedInt(38, 2);
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chan_a = bits.ToUnsignedInt(40, 12);
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chan_b = bits.ToUnsignedInt(52, 12);
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txrx_mode = bits.ToUnsignedInt(64, 4);
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power_low = bits[68];
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// WARNING: OUT OF ORDER DECODE
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bits.SeekTo(139);
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bool addressed = bits[139];
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bits.SeekTo(69);
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if (!addressed) {
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// geographic position
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// TODO(schwehr): For all implementations in libais, set the valid flag
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// after setting all of the data members.
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pos_valid = true;
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// TODO(schwehr): Confirm this is correct!
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position1 = bits.ToAisPoint(69, 35);
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position2 = bits.ToAisPoint(104, 35);
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} else {
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dest_valid = true;
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dest_mmsi_1 = bits.ToUnsignedInt(69, 30);
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// 5 spare bits
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bits.SeekRelative(5);
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dest_mmsi_2 = bits.ToUnsignedInt(104, 30);
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// 5 spare bits
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bits.SeekRelative(5);
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}
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// OUT OF ORDER: addressed is earlier before
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bits.SeekRelative(1);
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chan_a_bandwidth = bits[140];
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chan_b_bandwidth = bits[141];
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zone_size = bits.ToUnsignedInt(142, 3);
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spare2 = bits.ToUnsignedInt(145, 23);
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assert(bits.GetRemaining() == 0);
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status = AIS_OK;
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}
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} // namespace libais
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