src/marnav/seatalk/message_27.cpp

   1 #include "message_27.hpp"
   2
   3 namespace marnav
   4 {
   5 namespace seatalk
   6 {
   7
   8 message_27::message_27()
   9         : message(ID)
  10         , temperature(0)
  11 {
  12 }
  13
  14 std::unique_ptr<message> message_27::parse(const raw & data)
  15 {
  16         if (data.size() != 4)
  17                 throw std::invalid_argument{"invalid number of bytes in message_27::parse"};
  18         if (data[1] != 0x01)
  19                 throw std::invalid_argument{"invalid size specified in message"};
  20
  21         std::unique_ptr<message> result = utils::make_unique<message_27>();
  22         message_27 & msg = static_cast<message_27 &>(*result);
  23
  24         uint16_t value = 0;
  25         value += data[2];
  26         value <<= 8;
  27         value += data[3];
  28
  29         msg.temperature = value;
  30         msg.temperature -= 100;
  31
  32         return result;
  33 }
  34
  35 raw message_27::get_data() const
  36 {
  37         uint16_t value = (temperature + 100) & 0xffff;
  38
  39         return raw{static_cast<uint8_t>(ID), 0x01, static_cast<uint8_t>((value >> 8) & 0xff),
  40                 static_cast<uint8_t>((value >> 0) & 0xff)};
  41 }
  42 }
  43 }