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60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
// Class B static data report. Can be one of 4 different parts. Only
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// A and B defined for ITU 1371-3
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#include "ais.h"
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namespace libais {
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Ais24::Ais24(const char *nmea_payload, const size_t pad)
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: AisMsg(nmea_payload, pad), part_num(0), type_and_cargo(0),
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dim_a(0), dim_b(0), dim_c(0), dim_d(0), spare(0) {
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if (!CheckStatus()) {
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return;
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}
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if (num_bits != 160 && 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 == 24);
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bits.SeekTo(38);
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part_num = bits.ToUnsignedInt(38, 2);
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switch (part_num) {
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case 0: // Part A
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name = bits.ToString(40, 120);
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if (num_bits == 168) {
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// Accept the invalid size.
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spare = bits.ToUnsignedInt(160, 8);
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}
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break;
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case 1: // Part B
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if (num_bits == 160) {
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// Some devices incorrectly use part 1 as 0.
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name = bits.ToString(40, 120);
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part_num = 0;
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break;
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}
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type_and_cargo = bits.ToUnsignedInt(40, 8);
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vendor_id = bits.ToString(48, 42);
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callsign = bits.ToString(90, 42);
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dim_a = bits.ToUnsignedInt(132, 9);
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dim_b = bits.ToUnsignedInt(141, 9);
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dim_c = bits.ToUnsignedInt(150, 6);
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dim_d = bits.ToUnsignedInt(156, 6);
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spare = bits.ToUnsignedInt(162, 6);
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break;
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case 2: // FALLTHROUGH - Not defined by ITU 1371-5
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case 3: // FALLTHROUGH - Not defined by ITU 1371-5
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default:
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status = AIS_ERR_BAD_MSG_CONTENT;
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return;
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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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} // namespace libais
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