Last night I committed a small project to GitHub - PhysFS++. PhysFS++ provides C++ wrappers around Ryan C. Gordon's PhysicsFS. I licensed these wrappers under the zlib license, same as PhysicsFS (at the time of writing). It wraps PHYSFS_FILE* in C++ streams (both istream and ostream).
While I'm certain this has been done before, I decided to do myself from scratch as a learning experience, and because I could find no PhysicsFS C++ wrappers with clear licensing.
I do not guarantee the wrappers are perfect, but a smoke test showed that they work.
See the README at https://github.com/kahowell/physfs-cpp for more info.