Data Storage Class

I need a class written in C++ that can store and retrieve arbitrary chunks of data. Each piece of data will be identified by two longs (a long indicating the type of the data, and a log indicating the ID of that piece of data). The data chunks should all be stored within one file, the structure of which is up to the coder (although I have a sample structure which I feel works well). Emphasis is on speed of reading, not writing. Any questions please contact me via the comment feature. ## Deliverables Complete and fully-functional working code as well as complete source code of all work done. Complete copyrights to all work purchased. (Coder will be acknoleged in the credits of the final program) ## Platform Windows, Mac, AND Linux (should use standard C functions only)