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Re: [Cbor] Encoding Arbitrary Time Ratios

Emile Cormier <emile.cormier.jr@gmail.com> Sun, 04 April 2021 17:06 UTC

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From: Emile Cormier <emile.cormier.jr@gmail.com>
Date: Sun, 04 Apr 2021 14:05:48 -0300
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To: Carsten Bormann <cabo@tzi.org>
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Subject: Re: [Cbor] Encoding Arbitrary Time Ratios
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On Sun, Apr 4, 2021 at 5:38 AM Carsten Bormann <cabo@tzi.org> wrote:

>
> I've just had another idea... a denominator of zero (or possibly null)
> could be a magic value used to indicate that the numerator is a base 10
> exponent. This could allow a more compact representation when the ratio is
> milliseconds, nanoseconds etc. Eg [123, -9, 0] instead of [123, 1,
> 1000000000] for expressing 123ns.
>
>
> We already have decimal fractions (tag 4), so this is covered.
>

I overlooked tag 4 for that purpose. Thanks for reminding me.


> I'm wondering if a new C*N/D tag could be useful in application domains
> outside of timekeeping. It could be called something like "scaled ratio".
>
>
> Probably.
> Making it amenable to cbor-packed suffix (or circumfix!) compression would
> make this a quite versatile tool.
>
>
Are you referring to https://tools.ietf.org/html/draft-ietf-cbor-packed-02
? I wasn't aware of its existence before this.

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