[boost] [GIL] Loading a PNG from a stream

Hello, I have the need to load a PNG from a generic input stream that has a similar interface (i.e. has a read, operator ! and fail with the same signature/semantics as std::istream). The png reading extensions don't appear to be able to load from anything other than a FILE*. In a library as modern as GIL I'm sort of suprised there is apparently no way to load from a generic stream. Anyone have an idea how to make this happen? Perhaps there is another PNG library written in C++ or a wrapper around the C libpng? Thanks, Michael Marcin