The binary I/O stream class library presents a platform-independent way to access binary data streams in C++. It transparently converts between machine-internal binary data representation and can be used on arbitrary binary data sources.
i don't see how it's better then regular stdio.h, except introducing new bugs. i'd like if adplug stops using it.
Not used outside AdPlug, not maintained and there are many more common alternatives which should be enough for most people.