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If I run this code to compute a "checksum" of a file I get a different answer on a windows machine
and a FreeBSD machine. Does anyone know why? Or a better way to get a quick checksum of a file?

fname = ARGV[0]

size = File.size(fname);
checksum = 0;

f = File.new(fname)
f.each_byte {|x| checksum += x }

printf("%s: %d ( %x hex )\n", fname, checksum, checksum)


Thanks,
Ralph

Hi,

In message "Re: ruby gives different answer for checksum of files on windows and FreeBSD?"
on Tue, 25 Oct 2005 17:37:02 +0900, Ralph Smith <> writes:

|f = File.new(fname)

Try

f = File.new(fname, "rb")

and see how it works.


matz.

On Tue, 25 Oct 2005, Yukihiro Matsumoto wrote:

> Hi,
>
> In message "Re: ruby gives different answer for checksum of files on windows and FreeBSD?"
> on Tue, 25 Oct 2005 17:37:02 +0900, Ralph Smith <> writes:
>
> |f = File.new(fname)
>
> Try
>
> f = File.new(fname, "rb")
>
> and see how it works.

this comes up so often - would it make sense to be the default mode on
windows?

-a
--
================================================== =============================
| email :: ara [dot] t [dot] howard [at] noaa [dot] gov
| phone :: 303.497.6469
| anything that contradicts experience and logic should be abandoned.
| -- h.h. the 14th dalai lama
================================================== =============================

"Ara.T.Howard" <> writes:

> On Tue, 25 Oct 2005, Yukihiro Matsumoto wrote:
>
> > Hi,
> >
> > In message "Re: ruby gives different answer for checksum of files on windows and FreeBSD?"
> > on Tue, 25 Oct 2005 17:37:02 +0900, Ralph Smith <> writes:
> >
> > |f = File.new(fname)
> >
> > Try
> >
> > f = File.new(fname, "rb")
> >
> > and see how it works.
>
> this comes up so often - would it make sense to be the default mode on
> windows?

I'm guessing here, but my guess is that reading text files with ruby
is more common than non-text files. Does "rb" affect that?

--
I tend to view "truly flexible" by another term: "Make everything
equally hard". -- DHH

Hi,

In message "Re: ruby gives different answer for checksum of files on windows and FreeBSD?"
on Tue, 25 Oct 2005 23:21:21 +0900, "Ara.T.Howard" <> writes:

|> f = File.new(fname, "rb")
|>
|> and see how it works.
|
|this comes up so often - would it make sense to be the default mode on
|windows?

Unless your program communicates with other programs on Windows, that
use text-mode.

matz.

Yukihiro Matsumoto schrieb:
> Hi,
>
> In message "Re: ruby gives different answer for checksum of files on windows and FreeBSD?"
> on Tue, 25 Oct 2005 23:21:21 +0900, "Ara.T.Howard" <> writes:
>
> |> f = File.new(fname, "rb")
> |>
> |> and see how it works.
> |
> |this comes up so often - would it make sense to be the default mode on
> |windows?
>
> Unless your program communicates with other programs on Windows, that
> use text-mode.

Could someone provide an example for such a program? My Ruby programs
communicate with Vim and SQL*Plus, but I haven't used text-mode yet.

Regards,
Pit

Sean O'Halpin schrieb:
> On 10/25/05, daz <> wrote:
>
>>C's "fopen" seems to have missed this fact (??)
>
> It's part of ANSI C for stdio to open files by default in text mode.
> This does nothing on Unix but it converts CRLF (\r\n) to LF (\n) on
> Windows. This means you can write portable text processing programs in
> C (and in Ruby). If you're handling binary, you have to know what
> you're doing to write portable programs - binmode is the least of it.
>
> Changing to binmode by default would cause a lot more confusion for
> newbies and casual programmers on Windows. There'd be a lot of "how do
> I get rid of this \r character?" posts for a start. I reckon a lot
> more than binmode causes.

Thanks to you and Daz for the detailed answer. So it seems that the
editors you normally use make a difference whether you prefer text or
binary mode.

Regards,
Pit