Do the stream classes in Cocoa support seeking?

Question

I need a Cocoa class that can read and write from a memory stream and that supports seeking. In C#, MemoryStream supports the method seek, and in Java,

Answer 1

An arbitrary NSInputStream and NSOutputStream don't appear to support random offset seeking, and creating subclasses of them is notoriously difficult.

If you're going to be doing this reading and writing to a local file on disk (which I think you'd have to be, since I'm not sure how you could seek to a random offset on a network connection...), then what you're probably looking for is NSFileHandle.