Function IsSameScript

src/script/script_scanner.cpp:188–223

* Check whether the script given in info is the same as in ci based * on the shortname and md5 sum. * @param ci The information to compare to. * @param md5sum Whether to check the MD5 checksum. * @param info The script to get the shortname and md5 sum from. * @return True iff they're the same. */

 * @return True iff they're the same.
 */
static bool IsSameScript(const ContentInfo &ci, bool md5sum, const ScriptInfo &info, Subdirectory dir)
{
	uint32_t id = 0;
	auto str = std::string_view{info.GetShortName()}.substr(0, 4);
	for (size_t j = 0; j < str.size(); j++) id |= static_cast<uint8_t>(str[j]) << (8 * j);

	if (id != ci.unique_id) return false;
	if (!md5sum) return true;

	ScriptFileChecksumCreator checksum(dir);
	const auto &tar_filename = info.GetTarFile();
	TarList::iterator iter;
	if (!tar_filename.empty() && (iter = _tar_list[dir].find(tar_filename)) != _tar_list[dir].end()) {
		/* The main script is in a tar file, so find all files that
		 * are in the same tar and add them to the MD5 checksumming. */
		for (const auto &tar : _tar_filelist[dir]) {
			/* Not in the same tar. */
			if (tar.second.tar_filename != iter->first) continue;

			/* Check the extension. */
			auto ext = tar.first.rfind('.');
			if (ext == std::string_view::npos || !StrEqualsIgnoreCase(tar.first.substr(ext), ".nut")) continue;

			checksum.AddFile(tar.first, 0, tar_filename);
		}
	} else {
		/* There'll always be at least 1 path separator character in a script
		 * main script name as the search algorithm requires the main script to
		 * be in a subdirectory of the script directory; so <dir>/<path>/main.nut. */
		const std::string &main_script = info.GetMainScript();
		std::string path = main_script.substr(0, main_script.find_last_of(PATHSEPCHAR));
		checksum.Scan(".nut", path);
	}

	return ci.md5sum == checksum.md5sum;
}

bool ScriptScanner::HasScript(const ContentInfo &ci, bool md5sum)
{