Function InitFileSystem

source/core/initfs.cpp:329–460

}

void InitFileSystem(TArray<GrpEntry>& groups)
{
	TArray<int> dependencies;
	std::vector<std::string> Files;

	// First comes the engine's own stuff.
	const char* baseres = BaseFileSearch(ENGINERES_FILE, nullptr, true, GameConfig);
	D_AddFile(Files, baseres, true, -1, GameConfig);

	bool insertdirectoriesafter = Args->CheckParm("-insertdirafter");

	int i = groups.Size()-1;
	FString fn;
	for (auto &grp : groups)
	{
		// Add all dependencies, plus the directory of the base dependency.
		// Directories of addon content are not added if they differ from the main directory. 
		// Also, the directory is inserted after the base dependency, allowing the addons to override directory content.
		// This can be overridden via command line switch if needed.
		if (!grp.FileInfo.loaddirectory && grp.FileName.IsNotEmpty())
		{
			D_AddFile(Files, grp.FileName.GetChars(), true, -1, GameConfig);
			fn = ExtractFilePath(grp.FileName.GetChars());
			if (fn.Len() > 0 && fn.Back() != '/') fn += '/';
		}

		for (auto& fname : grp.FileInfo.loadfiles)
		{
			FString newname = fn + fname;
			D_AddFile(Files, newname.GetChars(), true, -1, GameConfig);
		}
		bool insert = (!insertdirectoriesafter && &grp == &groups[0]) || (insertdirectoriesafter && &grp == &groups.Last());

		// Add the game's main directory in the proper spot.
		if (insert)
		{
			// Build's original 'file system' loads all GRPs before the first external directory.
			// Do this only if explicitly requested because this severely limits the usability of GRP files.
			if (insertdirectoriesafter && userConfig.AddFilesPre) for (auto& file : *userConfig.AddFilesPre)
			{
				D_AddFile(Files, file.GetChars(), true, -1, GameConfig);
			}

			D_AddFile(Files, fn.GetChars(), true, -1, GameConfig);
		}
		i--;
	}
	fileSystem.SetIwadNum(1);
	fileSystem.SetMaxIwadNum((int)Files.size() - 1);

	if (!Args->CheckParm("-noautoload"))
	{
		D_AddConfigFiles(Files, "Global.Autoload", "*.grp", GameConfig);

		size_t len;
		size_t lastpos = 0;

		while (lastpos < LumpFilter.Len() && (len = strcspn(LumpFilter.GetChars() + lastpos, ".")) > 0)