Re: [Cbor] Record proposal
Carsten Bormann <cabo@tzi.org> Wed, 17 November 2021 20:52 UTC
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From: Carsten Bormann <cabo@tzi.org>
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Date: Wed, 17 Nov 2021 21:52:03 +0100
Cc: Christian Amsüss <christian@amsuess.com>, cbor@ietf.org
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To: Kris Zyp <kriszyp@gmail.com>
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Subject: Re: [Cbor] Record proposal
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Hi Kris, thank you for the update. I still need to take a closer look, but I have one immediate reaction: You probably shouldn’t induce implementations to “hijack” a tag number. The handling of a tag number that has actually been allocated for something else may be deeply embedded into the CBOR decoder; a record implementation then would only see gobbledygook. So I think we should allocate some space for tag-allocated tags — I don’t see a big problem with allocating a chunk above 32768 just for the record proposal. Grüße, Carsten > On 2021-11-17, at 16:16, Kris Zyp <kriszyp@gmail.com> wrote: > > I have updated my tag registration proposal/submission at > https://github.com/kriszyp/cbor-records to use 1+2 tag entries, which > hopefully makes this a much less intrusive registry entry. I have also > updated the proposed tag definitions to also support up-front > declaration of a set of record structure definitions for a data item > ("around" that data item, like the packed approach, as you suggested), > in addition to the current inline record definitions (which can be > scoped with record definitions and should follow a well-specified > order for when they can be referenced by subsequent references). I > hope this offers flexibility for encoders that have all structures > known a-priori and streaming encoders (that do not), while still > maintaining nearly the same mechanics for decoders. Let me know if you > think this looks reasonable. > Thank you! > Kris > > On Thu, Nov 11, 2021 at 9:15 PM Kris Zyp <kriszyp@gmail.com> wrote: >> >>> Actually, stats would be very interesting. >>> I was assuming that the 1+1 setup comes with a number of 1+2 referencing records, the hit from going to 1+2 there as well would be relatively insignificant. >>> Number are better than assumptions! >> >> You are definitely right, using 1+2 tag for defining records is pretty >> insignificant (around a quarter of percent in my tests). Anyway, I put >> together some tests comparing CBOR packed, record structures, and >> combinations with a couple test data structures, with my library, for >> the sake of further comparisons: >> https://gist.github.com/kriszyp/b623b85d2dc25ac9e3b07d8f39df9307 >> >> Anyway, seeing this, I am happy to go ahead and update my proposal to >> use a 1+2 tag for defining records. And thinking about this, I don't >> think my proposal necessarily even needs to mandate the tag ids used >> for referencing records since those are dynamically assigned and >> explicitly specified by the encoder itself (encoder obviously must not >> conflict and use tag ids that will be used for other purposes), albeit >> can encourage a certain range (presumably from the first-come >> first-serve range). >> >> Do you have any preference for a tag id to use? It looks like 279 is >> the next in the contiguous block, but sounds like choosing aesthetic >> characters is the new preference (29299/"rs" perhaps). >> >> Anyway, thanks again for the helpful feedback, really appreciate it! >> >> Thanks, >> Kris > > _______________________________________________ > CBOR mailing list > CBOR@ietf.org > https://www.ietf.org/mailman/listinfo/cbor
- [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Record proposal Christian Amsüss
- Re: [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Christian Amsüss
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Emile Cormier
- Re: [Cbor] Record proposal Kris Zyp
- Re: [Cbor] Record proposal Emile Cormier
- Re: [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Record proposal Emile Cormier
- Re: [Cbor] Record proposal Kris Zyp
- [Cbor] Request for reviewers for external documen… Christian Amsüss
- Re: [Cbor] Request for reviewers for external doc… Christian Amsüss
- Re: [Cbor] Record proposal Carsten Bormann
- Re: [Cbor] Request for reviewers for external doc… Christian Amsüss