Function file_as_buffer

src/openboardview/utils.cpp:19–48

Loads an entire file in to memory

// Loads an entire file in to memory
std::vector<char> file_as_buffer(const filesystem::path &filepath, std::string &error_msg) {
	std::vector<char> data;

	if (!filesystem::is_regular_file(filepath)) {
		error_msg = "Not a regular file";
		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Error opening %s: %s", filepath.string().c_str(), error_msg.c_str());
		return data;
	}

	ifstream file;
	file.open(filepath, std::ios::in | std::ios::binary | std::ios::ate);

	if (!file.is_open()) {
		error_msg = strerror(errno);
		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Error opening %s: %s", filepath.string().c_str(), error_msg.c_str());
		return data;
	}

	file.seekg(0, std::ios_base::end);
	std::streampos sz = file.tellg();
	ENSURE(sz >= 0, error_msg);
	data.reserve(sz);
	file.seekg(0, std::ios_base::beg);
	data.assign(std::istreambuf_iterator<char>(file), std::istreambuf_iterator<char>());

	ENSURE(data.size() == static_cast<unsigned int>(sz), error_msg);
	file.close();

	return data;
}

// Extract extension from filename and check against given fileext
// fileext must be lowercase