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Re: Static JSON parser for embedded

Cross-posted to 2 groups.

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Il 06/06/2019 01:48, Clifford Heath ha scritto:
> On 6/6/19 12:44 am, pozz wrote:
>>> So there is existing work, and no doubt community support for more.
>>> You could do a lot worse than start with ASN1CC.
>>
>> I eventually take a look at asn1scc and found a big limitation: it 
>> doesn't support extensibility feature of ASN.1.
> 
> One more comment. You mention (in other messages) that JSON is difficult 
> without using dynamic memory. ASN1CC is designed to avoid using dynamic 
> memory (for the same reason; embedded system constraints), which is why 
> it cannot implement arbitrary extensions. The best it could do is to 
> skip unknown extensions. 

Yes, many times this behaviour is good, instead of breaking at all the 
system.

> But in PER, items are not tagged or 
> length-delimited, and skipping an extension requires at least a 
> knowledge of how big it is.

Ok, PER can't be used to skip extended variables. However I can use BER. 
Why do asn1scc refuses to compile definitions file with extensions when 
BER is used?

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Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-06-06 09:48 +1000
  Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-06-06 09:54 +0200

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