Function GRFLoadConfig

src/settings.cpp:1059–1163

* Load a GRF configuration * @param ini The configuration to read from. * @param grpname Group name containing the configuration of the GRF. * @param is_static GRF is static. */

 * @param is_static GRF is static.
 */
static GRFConfigList GRFLoadConfig(const IniFile &ini, std::string_view grpname, bool is_static)
{
	const IniGroup *group = ini.GetGroup(grpname);
	GRFConfigList list;

	if (group == nullptr) return list;

	uint num_grfs = 0;
	for (const IniItem &item : group->items) {
		std::unique_ptr<GRFConfig> c{};

		std::array<uint8_t, 4> grfid_buf;
		MD5Hash md5sum;
		std::string_view item_name = item.name;
		bool has_md5sum = false;

		/* Try reading "<grfid>|" and on success, "<md5sum>|". */
		auto grfid_pos = item_name.find("|");
		if (grfid_pos != std::string_view::npos) {
			std::string_view grfid_str = item_name.substr(0, grfid_pos);

			if (ConvertHexToBytes(grfid_str, grfid_buf)) {
				item_name = item_name.substr(grfid_pos + 1);

				auto md5sum_pos = item_name.find("|");
				if (md5sum_pos != std::string_view::npos) {
					std::string_view md5sum_str = item_name.substr(0, md5sum_pos);

					has_md5sum = ConvertHexToBytes(md5sum_str, md5sum);
					if (has_md5sum) item_name = item_name.substr(md5sum_pos + 1);
				}

				uint32_t grfid = grfid_buf[0] | (grfid_buf[1] << 8) | (grfid_buf[2] << 16) | (grfid_buf[3] << 24);
				if (has_md5sum) {
					const GRFConfig *s = FindGRFConfig(grfid, FGCM_EXACT, &md5sum);
					if (s != nullptr) c = std::make_unique<GRFConfig>(*s);
				}
				if (c == nullptr && !FioCheckFileExists(std::string(item_name), NEWGRF_DIR)) {
					const GRFConfig *s = FindGRFConfig(grfid, FGCM_NEWEST_VALID);
					if (s != nullptr) c = std::make_unique<GRFConfig>(*s);
				}
			}
		}
		std::string filename = std::string(item_name);

		if (c == nullptr) c = std::make_unique<GRFConfig>(filename);

		/* Parse parameters */
		if (item.value.has_value() && !item.value->empty()) {
			auto params = ParseIntList(*item.value);
			if (params.has_value()) {
				c->SetParams(params.value());
			} else {
				ShowErrorMessage(GetEncodedString(STR_CONFIG_ERROR),
					GetEncodedString(STR_CONFIG_ERROR_ARRAY, filename),
					WL_CRITICAL);
			}
		}