Is there something like a class that might be used to store Files and directories in, just like the way Zip files might be used?

Since I haven't found any "real" class to write Zip files (real class as in real class), It would be nice to be able to store Files and Directories in a container-like file.

A perfect API would probably look like this:

int main()
{
    ContainerFile cntf("myContainer.cnt", ContainerFile::CREATE);
    cntf.addFile("data/some-interesting-stuff.txt");
    cntf.addDirectory("data/foo/");
    cntf.addDirectory("data/bar/", ContainerFile::RECURSIVE);
    cntf.close();
}

... I hope you get the Idea. Important Requirements are:

• The Library must be crossplatform
• anything *GPL is not acceptable in this case (MIT and BSD License are)

I already played with the thought of creating an Implentation based on SQLite (and its ability to store binary blobs). Unfortunately, it seems impossible to store Directory structures in a SQLite Database, which makes it pretty much useless in this case.

Is it useless to hope for such a class library?