Add loading fonts from memorystream or byte array

The title says it all really, there seems to be no easy way to use a font in WPF that isn't installed on the OS, embedded in the app, or saved in the file system.

I have some fonts in a compressed folder that I would like to use without having to extract them to a temp folder, I don't know the name of the font family, just the location ('file name') within the compressed folder.