Hello all. I am trying to create a wrapper for a set of resources (mixed text, image, etc files) for use in an SDL-based application. I want to use iostreams and keep it as close to C++ as I can, but SDL uses some functions that load data from c-type file pointers or a location in memory using a void* and byte-count. Is it possible to define a method of file access using iostreams and a filter that will then let me create sub-streams of the data inside?? For instance - a zlib-compressed file called 'foobar.gz' that contains 'foo.txt' and 'bar.png'. I want to attach an iostream to foobar.gz then use functions to get the contents in different formats, e.g. stream compressed_file( "foobar.gz" ); ifstream foo = compressed_file.getasfilestream( "foo.txt" ); // read stuff from foo foo.close(); char* img_data; unsigned long size; compressed_file.getasmembuffer( img_data, &size ); // read img_data and poke around with it delete[] img_data; I know the above is just for illustration, but I can't find any libs that do this sort of work. I am having some real problems now even at the design stage, for instance how to neatly pack multiple files into a single one. My packed-file headers always seem to go wrong and without fixed-length space for files names it gets even more painful :-) If this isn't the right place for this sort of question (I see it's far more conceptual than directly boost-related) then I apologise and will start hitting on some more generic forums and lists ;-) Thanks for your time, GT