OpenEuphoria

RE: Check if files equal

• Posted by jordah ferguson <jorfergie03 at yahoo.com> Jul 08, 2002
• 420 views

Kats test is very efficient, but terribly slow.

i think checking last characters of the file[50]bytes and beginning the 
ten random bytes in the middle. be sure to use seek() and where
to get the correct file size.

jordah

Kat wrote:
> On 7 Jul 2002, at 1:51, 10963508 at europeonline.com wrote:
> 
> > 
> > What is the fastest way of checking if two very large files (~500 MB) 
> > are
> > equal?
> > I was thinking about this:
> > -name
> > -size
> > -date last modified
> > -pick about 10 random positions and check if bytes at those positions in
> > both files match.
> 
> I would not trust those tests at all.
> 
> > Is there any better and faster way that I'm not aware of?
> 
> Open file
> while not eof do
> Read them in, one buffer size at a time, 
> compare, 
> if not equal { tell me it's not equal, abort}
> end while
> 
> Kat
> 
>