GPSASCIILog.h

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#pragma once
 
#include <cstdint>
#include <optional>
#include <string_view>
 
#include "CRC32.h"
#include "NMEASentence.h"
 
struct GPSASCIILog
{
    std::string_view name;
    std::string_view source;
};
 
[[nodiscard]] inline std::optional<GPSASCIILog> gpsASCIILog(std::string_view line)
{
    constexpr size_t CRC_DIGITS = 8;
    const size_t star = line.rfind('*');
    if (!line.starts_with('#') || star == std::string_view::npos || star + 1 + CRC_DIGITS != line.size()) {
        return std::nullopt;
    }
    const auto expected = NMEA::hexNumber(line.substr(star + 1));
    if (!expected || *expected != QGC::crc32Update({reinterpret_cast<const uint8_t*>(line.data() + 1), star - 1})) {
        return std::nullopt;
    }
    const size_t semicolon = line.find(';');
    const size_t first = line.find(',');
    if (semicolon == std::string_view::npos || first == std::string_view::npos || first > semicolon) {
        return std::nullopt;
    }
    const size_t second = line.find_first_of(",;", first + 1);
    return GPSASCIILog{.name = line.substr(1, first - 1), .source = line.substr(first + 1, second - first - 1)};
}