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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