[Boost-users] converting a string to base64

Hi, Does anyone know of an open source boost.iostreams filter that will convert a string (either std::string, or std::wstring) to/from base64? I know there is some code within beest, but wondered whether this had been wrapped? Similarly, I know that there were issues with boost.serialization's base64 code (from memory, I don't think it padded correctly) and don't think there was a filter for this either. Any help appreciated. Kind regards Sean.