MemoryMapping Large Files - ???

FROM : Christopher Holland
DATE : Sat Jan 12 12:52:51 2002

Hello everyone,

I am having a bit of a problem mapping a rather "large" file to an NSData
object. I can map smaller files without problem, but the larger one pukes
with the following error:
   
  -[NSConcreteData initWithBytes:length:copy:freeWhenDone:bytesAreVM:]:
absurd length: 1866240000

Of course the length of the file is almost 2 gigs so I realized that it
might
have problems before I got started. OSX is supposed to be able to handle
files larger than 2 gigs, correct?

I'm using the following code:
  bigData = [[NSData alloc] initWithContentsOfMappedFile:bigDataPath];

I've tried using 'initWithContentsOfFile' also...just to see if it was the
memory mapping doing it.....no go there.

Should I use the BSD 'mmap' funtion instead of using the 'NSData' methods
above? I'm not coding wizard, but I 've worked with this data and written a
similar program for SGIs. I'm just starting to work on OSX programming and
I'm excited by the possibilities.

Any insight into the mmap problem would be appreciated.

Thanks,

Christopher Holland


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