Hah! That would be a good reason! :-)
And re-reading the *Specification* I now spot it saying "The string must
consist entirely of decimal digits." (Sigh!)
I was led astray because when I searched with Google I didn't find mention
of Base62 only converting numbers, and indeed I found a web page to convert
arbitrary text to Base 62.
Hmm… I wonder if it's only Exim's implementation of the base62 expansion
operator that imposes the numeric-only requirement, rather than the method
as a whole?
Cheers and apologies,
Mike B-)
On 19 October 2016 at 13:27, Felipe Gasper <felipe@???> wrote:
> base62 only encodes numerals, though.
>
> -FG
>
> > On Oct 19, 2016, at 4:16 AM, Mike Brudenell <mike.brudenell@???>
> wrote:
> >
> > Or perhaps just use Exim's existing base62 and base62d expansion
> operators?
> > :-)
> >
> > http://www.exim.org/exim-html-current/doc/html/spec_html/ch-
> string_expansions.html#SECTexpop
> >
> >
> > These:
> >
> > - use the character set [A-Za-z0-9] on case-sensitive systems;
> > - use base36 encoding using [A-Z0-9] instead on systems with
> > case-insensitive file names;
> > - are used by Exim to generate its message identifiers, and hence
> > (presumably safe!) file names to store message data in the file system.
> >
> > Cheers,
> > Mike B-)
> >
> >
> > On 18 October 2016 at 22:21, Phil Pennock <exim-users@???>
> wrote:
> >
> >> On 2016-10-18 at 08:28 +0200, Arkadiusz Miśkiewicz wrote:
> >>> On Monday 17 of October 2016, Phil Pennock wrote:
> >>>> Or base64-encode it.
> >>>
> >>> "/" is part of base64 alphabet, so would have to replace that with
> other
> >>> character, too.
> >>
> >> You're quite right. I was thinking of the `base64url` encoding from
> >> RFC4648; it's used so often that I forgot.
> >
> >
> > --
> > Systems Administrator & Change Manager
> > IT Services, University of York, Heslington, York YO10 5DD, UK
> > Tel: +44-(0)1904-323811
> >
> > Web: www.york.ac.uk/it-services
> > Disclaimer: www.york.ac.uk/docs/disclaimer/email.htm
> > --
> > ## List details at https://lists.exim.org/mailman/listinfo/exim-users
> > ## Exim details at http://www.exim.org/
> > ## Please use the Wiki with this list - http://wiki.exim.org/
>
>
> --
> ## List details at https://lists.exim.org/mailman/listinfo/exim-users
> ## Exim details at http://www.exim.org/
> ## Please use the Wiki with this list - http://wiki.exim.org/
>
--
Systems Administrator & Change Manager
IT Services, University of York, Heslington, York YO10 5DD, UK
Tel: +44-(0)1904-323811
Web:
www.york.ac.uk/it-services
Disclaimer:
www.york.ac.uk/docs/disclaimer/email.htm
