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Re: [Cbor] Failure Testcases (was: RE: Simple Value Example)

Jeffrey Yasskin <jyasskin@chromium.org> Wed, 30 January 2019 21:05 UTC

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From: Jeffrey Yasskin <jyasskin@chromium.org>
Date: Wed, 30 Jan 2019 13:05:36 -0800
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To: "Richter, Jörg" <Joerg.Richter@pdv-fs.de>
Cc: Carsten Bormann <cabo@tzi.org>, "cbor@ietf.org" <cbor@ietf.org>
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Subject: Re: [Cbor] Failure Testcases (was: RE: Simple Value Example)
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On Wed, Jan 30, 2019 at 4:55 AM Richter, Jörg <Joerg.Richter@pdv-fs.de>
wrote:

> Another set of test cases can be constructed when using tags.  But I think
> this is more involved and not clearly defined.  But I might be wrong.
> Consider for example a bigfloat. Is it allowed that the array elements
> themselves
> are using a tag?
>
> Or what if a tag is followed by an element that is not allowed for this
> tag.
> Like following a tag for a set (tag=258) with a string instead of an
> array?  Should this
> cause a decode error?
>

<https://github.com/cbor-wg/CBORbis/pull/18>
https://github.com/cbor-wg/CBORbis/pull/18 tries to specify which contents
for tags are valid, and https://github.com/cbor-wg/CBORbis/pull/17 says
that generic decoders don't necessarily reject invalid-but-well-formed data.

Or is it allowed that Tag 55799 (0xd9d9f7) is the only content of a CBOR
> file?
>

No, because any well-formed tag contains another CBOR item.

Jeffrey

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