[Cbor] Re: New Version Notification for draft-amsuess-cbor-packed-shuffle-00.txt

[Mikolai Gütschow <[e-mail]>]

Hi Christian,

thanks for sharing the draft, looks interesting!

Two thoughts that came up while I was reading through it:

(1) CPA115 for 's' (shuffle), nice one.

(2) For packed CBOR, we propose tag CPA113 and CPA1113 for combined or 
split shared item and argument item table. In your draft, you expect the 
argument list as an _optional_ second item:

---
Packed-Shuffle = #6.<cpa115>([
        shuffle-shared,
        ?shuffle-argument,
        rump])
---

That makes me wonder if packed CBOR should do the same only with CPA113. 
On the pro side, the table setup would save one byte, while consuming 
the CBOR stream would require going over the second list item once to 
find out if there is a third one in case the outer array uses indefinite 
length encoding (which it really shouldn't do, but which is currently 
not restricted AFAIK. I'm also not sure if it is actually possible in 
the data model of CBOR to distinguish between those two types of arrays)

Should we be consistent here and in draft-cbor-packed?

Best
Mikolai



On 7/29/24 13:43, Christian Amsüss wrote:
> Hi CBOR group,
> 
> On Mon, Jul 29, 2024 at 04:29:01AM -0700, [e-mail] wrote:
>> Name:     draft-amsuess-cbor-packed-shuffle
>> Revision: 00
>> Title:    Packed CBOR: Table permutations
>> Status:   https://datatracker.ietf.org/doc/draft-amsuess-cbor-packed-shuffle/
>>
>> Abstract:
>>
>>     Packed CBOR is a compression mechanism for Concise Binary Object
>>     Representation (CBOR) that can be used without a decompression step.
>>     This document introduces a means for altering configured tables to
>>     optimize the use of efficient encoding points by shuffling around
>>     entries in the packing tables.
> 
> This happened while playing around with imported table setups.
> 
> It is probably too early for general discussion, but if you're exploring
> which table setup mechanisms would work best when, it may be an option
> worth considering.
> 
> Best regards
> Christian
> 
> 
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-- 
Mikolai Gütschow
TU Dresden, Chair of Distributed and Networked Systems
https://tu-dresden.de/cs/netd/about/team/guetschow