Hi -- I'm still learning to use ghc effectively, and I'm trying to use it for more-or-less mundane programming tasks, hopefully in a way which is a lot more elegant than I'd do in Java or Perl. I've got a big [around a gigabyte] binary file, filled with identical binary structures (imagine a C process writing structs). I'd like to process/analyze them efficiently. In C or even Java, i'd memory map the file and extract the data I need. Is there a fast way to do this using ghc? I can extract fields by using a ByteString, but I may not be using it fast enough: I've had to write my own routines to extract ints, longs and doubles. The other option is to write the loading code largely in C, but I'm not clear how to write a data type which maps well to a C struct. Any help / examples would really be appreciated. Thanks, Ranjan