[racket-dev] random-access file reading

I want to read a chunk from the middle of a 50-megabyte file.  As far as I can see, there are no random-access file primitives currently in DrRacket.  Also, I don't see a "skip-bytes", so it looks like I should be allocating a junk buffer and then repeatedly calling read-bytes to read the skipped portion into the junk buffer.  

Tell me if there's a simpler way to do this; doc pointers always appreciated.

John

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