portapack-mayhem/firmware/common/ais_packet.hpp
2015-12-08 16:08:20 -08:00

102 lines
2.3 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __AIS_PACKET_H__
#define __AIS_PACKET_H__
#include "baseband_packet.hpp"
#include "field_reader.hpp"
#include "lpc43xx_cpp.hpp"
using namespace lpc43xx;
#include <cstdint>
#include <cstddef>
#include <string>
namespace ais {
struct DateTime {
uint16_t year;
uint8_t month;
uint8_t day;
uint8_t hour;
uint8_t minute;
uint8_t second;
};
using Latitude = int32_t;
using Longitude = int32_t;
using MMSI = uint32_t;
class Packet {
public:
constexpr Packet(
const rtc::RTC& received_at,
const baseband::Packet& packet
) : packet_ { packet },
received_at_ { received_at },
field_ { packet_ }
{
}
size_t length() const;
bool is_valid() const;
rtc::RTC received_at() const;
uint32_t message_id() const;
MMSI user_id() const;
MMSI source_id() const;
uint32_t read(const size_t start_bit, const size_t length) const;
std::string text(const size_t start_bit, const size_t character_count) const;
DateTime datetime(const size_t start_bit) const;
Latitude latitude(const size_t start_bit) const;
Longitude longitude(const size_t start_bit) const;
bool crc_ok() const;
private:
using Reader = FieldReader<baseband::Packet, BitRemapByteReverse>;
using CRCReader = FieldReader<baseband::Packet, BitRemapNone>;
const baseband::Packet packet_;
const rtc::RTC received_at_;
const Reader field_;
const size_t fcs_length = 16;
size_t data_and_fcs_length() const;
size_t data_length() const;
bool length_valid() const;
};
} /* namespace ais */
#endif/*__AIS_PACKET_H__*/