Re: Fast hash of NSData?
Re: Fast hash of NSData?
- Subject: Re: Fast hash of NSData?
- From: "Gary L. Wade" <email@hidden>
- Date: Sat, 30 Nov 2013 10:42:55 -0800
- Thread-topic: Fast hash of NSData?
Getting the attributes of a file is a very fast operation provided you use
the right calls; all of that information is in its catalog and should
require at most one block read and at least a lookup in an OS-related
cache. If you are accessing the file system across a network (I doubt it
from your earlier info in which you said the user is dropping an image on
your app or document), this could be a bit slower, but using the right API
or info on a protocol stream should give you what you're needing. You
might be looking at things from too high a level; consider a much
lower-level solution if appropriate.
FYI, I've worked on a few backup and sync apps/processes and am pretty
comfortable with file system bottlenecks both local and remote.
--
Gary L. Wade
http://www.garywade.com/
On 11/30/2013 2:47 AM, "Graham Cox" <email@hidden> wrote:
>It¹s also likely to be slow in itself - grabbing this sort of data from
>the file system requires hitting the disk, possibly multiple times.
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