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60 lines
1.3 KiB
C++
60 lines
1.3 KiB
C++
// @ - Assigned mode command
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// TODO(schwehr): Use valid flags rather than negative numbers.
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#include "ais.h"
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namespace libais {
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Ais16::Ais16(const char *nmea_payload, const size_t pad)
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: AisMsg(nmea_payload, pad),
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spare(0),
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dest_mmsi_a(0),
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offset_a(0),
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inc_a(0),
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dest_mmsi_b(0),
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offset_b(0),
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inc_b(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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// 96 or 144 bits
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// 168 bits violates the spec but is common
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if (num_bits != 96 && num_bits != 144 && num_bits != 168) {
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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 == 16);
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bits.SeekTo(38);
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spare = bits.ToUnsignedInt(38, 2);
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dest_mmsi_a = bits.ToUnsignedInt(40, 30);
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offset_a = bits.ToUnsignedInt(70, 12);
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inc_a = bits.ToUnsignedInt(82, 10);
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if (num_chars == 16) {
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dest_mmsi_b = -1;
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offset_b = -1;
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inc_b = -1;
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spare2 = bits.ToUnsignedInt(92, 4);
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assert(bits.GetRemaining() == 0);
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status = AIS_OK;
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return;
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}
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dest_mmsi_b = bits.ToUnsignedInt(92, 30);
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offset_b = bits.ToUnsignedInt(122, 12);
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inc_b = bits.ToUnsignedInt(134, 10);
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// TODO(schwehr): Actually decode spare2.
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spare2 = -1;
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// Currently crashes with the check.
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// TODO(schwehr): Add 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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