OpenEuphoria

RE: Checking file integrity

• Posted by rforno at tutopia.com Apr 23, 2003
• 397 views

----- Original Message -----
From: Robert Craig <rds at RapidEuphoria.com>
Subject: Re: Checking file integrity


> x
> x
> rforno at tutopia.com wrote:
> > Wouldn't be it possible for Euphoria to return an error report in such a
> > case, for example with a negative number different from -1 (EOF)?
> > Maybe I'm wrong, but I think the OS has a variable called errno (under
C)
> > that can be accessed by the user. Couldn't it be used to that end?
>
> I'm not aware of any test that I could make that would
> detect an error on the disk media. Even if there were
> such a test, would it be worth wasting a couple of machine
> cycles on *every* byte read by *every* program?
>
Of course I didn't think of checking every byte. I think the disk driver
maybe checks parity, or CRC.

> I believe that each disk sector has a checksum on it.
> Perhaps your "Nero" program sees if the checksum is correct.
>
I also think so. Would it be possible for Euphoria to access this
information?

> I would have thought that the O/S would complain loudly
> if a sector were bad (i.e. bad checksum).
>
So did I (this was what I expected from the first version of my program, as
you pointed out), but apparently this didn't happen. I am going to perform
some experiments on this subject.
Regards.
> Regards,
>     Rob Craig
>     Rapid Deployment Software
>     http://www.RapidEuphoria.com
>
>
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