Offical Quake 1 source code (this is not a joke)

This is the offical Quake 1 source code. Its a 3meg file, of total source code. I have just started in C++, and couldn't make heads or tails of this. The source code might work with other C++ versions, but I don't know. Have fun customizing the whole quake game. Vote for me if you like it...