Method load_from_file

src/World.cpp:563–598

}

void World::load_from_file(const std::filesystem::path& filePathToLoadFrom, std::string_view buffer) {
    filePath = filePathToLoadFrom;

    std::string byteDataFromFile;

    if(buffer.empty()) {
        byteDataFromFile = read_file_to_string(filePath);
        buffer = byteDataFromFile;
    }

    if(buffer.size() < VersionConstants::SAVEFILE_HEADER_LEN)
        throw std::runtime_error("[World::load_from_file] File is not an InfiniPaint canvas (File too small)");

    std::string_view fileHeader = buffer.substr(0, VersionConstants::SAVEFILE_HEADER_LEN);
    VersionNumber fileVersion = VersionConstants::header_to_version_number(std::string(fileHeader));
    std::string_view uncompressedDataView;
    std::vector<char> uncompressedDataVector;

    if(fileVersion < VersionNumber(0, 1, 0))
        uncompressedDataView = std::string_view(buffer.data() + VersionConstants::SAVEFILE_HEADER_LEN, buffer.size() - VersionConstants::SAVEFILE_HEADER_LEN);
    else {
        uncompressedDataVector.resize(ZSTD_getFrameContentSize(buffer.data() + VersionConstants::SAVEFILE_HEADER_LEN, buffer.size() - VersionConstants::SAVEFILE_HEADER_LEN));
        size_t trueUncompressedSize = ZSTD_decompress(uncompressedDataVector.data(), uncompressedDataVector.size(), buffer.data() + VersionConstants::SAVEFILE_HEADER_LEN, buffer.size() - VersionConstants::SAVEFILE_HEADER_LEN);
        uncompressedDataView = std::string_view(uncompressedDataVector.data(), trueUncompressedSize);
    }

    ByteMemStream f((char*)uncompressedDataView.data(), uncompressedDataView.size());

    Logger::get().log(Logger::LogType::INFO, "Loading file from version " + version_numbers_to_version_str(fileVersion));

    cereal::PortableBinaryInputArchive a(f);
    load_file(a, fileVersion);

    Logger::get().log(Logger::LogType::DESKTOP_USERINFO, "File loaded");
    set_name(filePath.stem().string());
}

void World::save_file(cereal::PortableBinaryOutputArchive& a) const {
    drawData.cam.save_file(a, *this);