Re: [Cbor] Reminder: bi-weekly CBOR conference call on 5 May

Carsten Bormann <cabo@tzi.org> Tue, 04 May 2021 19:18 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Subject: Re: [Cbor] Reminder: bi-weekly CBOR conference call on 5 May
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On 2021-05-04, at 16:54, Barry Leiba <barryleiba@computer.org> wrote:
> 
> https://codimd.ietf.org/notes-ietf-interim-2021-cbor-08-cbor

I finally managed to get a version of the cbor-packed gem out.

Best to use with cbor-diag, e.g.

$ echo '[1, 2, 2, 4711, 4711]' | diag2diag.rb -p
51([[4711], [], [], [1, 2, 2, simple(0), simple(0)]])
$ echo '[1, 2, 2, 4711, 4711]' | diag2diag.rb -pq
[1, 2, 2, 4711, 4711]

(OK, that is not great compression when adding in the compression tag overhead, but it does show that 2 is not shared while 4711 is.)

-p = pack
-q = unpack (u was taken…)

echo '["https://tzi.de", "http://ietf.org", "https://www.facebook.com", "https://www.twitter.com", "https://tzi.de"]' | diag2diag.rb -p
51([[225("tzi.de")], 
    ["http", 6("s://"), 225("www.")], 
    [], 
    [simple(0), 6("://ietf.org"), 226("facebook.com"), 226("twitter.com"), simple(0)]])

As you can see, the compressor is a bit simple-minded, and it doesn’t do suffixes at all yet (should do “.com"!), or prefixes for anything but strings.

Let the bug reports flow in…
(And let’s discuss this tomorrow.)

Grüße, Carsten