Re: MemoryMapping Large Files - ???

FROM : Jeff Galyan
DATE : Sat Jan 12 19:59:51 2002

You can only map an entire 2GB+ file into memory on 64-bit systems. Mac OS X
is still 32-bit.

--Jeff



On 1/12/02 4:52 AM, "Christopher Holland" <<email_removed>> wrote:

> 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
>
>
> Sent using the Entourage X Test Drive.
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