src/marnav/nmea/checksum.cpp

   1 #include "checksum.hpp"
   2
   3 namespace marnav
   4 {
   5 namespace nmea
   6 {
   7 checksum_error::checksum_error(uint8_t expected, uint8_t actual)
   8         : expected(expected)
   9         , actual(actual)
  10 {
  11         snprintf(
  12                 text, sizeof(text), "checksum error (actual:%02X, expected:%02X)", actual, expected);
  13 }
  14
  15 /// @cond DEV
  16 namespace detail
  17 {
  18 static constexpr char hex_digit(unsigned int t) noexcept
  19 {
  20         return "0123456789ABCDEF"[t & 0xf];
  21 }
  22 }
  23 /// @endcond
  24
  25 /// Returns the specified checksum as string.
  26 ///
  27 /// @param[in] sum The checksum to render as string.
  28 /// @return The checksum as string. This string is always two characters.
  29 ///
  30 std::string checksum_to_string(uint8_t sum)
  31 {
  32         char buf[3]{detail::hex_digit(sum >> 4), detail::hex_digit(sum), '\0'};
  33         return buf;
  34 }
  35 }
  36 }