Derive a SEQUENCE OF SEQUENCE?

[joshwatson]

I was able to derive some structs that deserialize correctly, but I'm struggling to figure out how to represent a SEQUENCE OF SEQUENCE in a struct. Is there an example of this anywhere? Is it possible, or do I need to write my own code with a d.read_element::<asn1::SequenceOf>() to do this?

[alex]

Sure, this is very much possible!

#[derive(asn1::Asn1Read, asn1::Asn1Write, Hash, PartialEq, Clone)]
pub(crate) struct TbsCertificate<'a> {
    // ...
    extensions: Option<asn1::SequenceOf<'a, Extension<'a>>>,
}

#[derive(asn1::Asn1Read, asn1::Asn1Write, PartialEq, Hash, Clone)]
pub(crate) struct Extension<'a> {
    pub(crate) extn_id: asn1::ObjectIdentifier<'a>,
    #[default(false)]
    pub(crate) critical: bool,
    pub(crate) extn_value: &'a [u8],
}

Does that answer your question?

[alex]

Or if you've really just got SEQUENCE OF SEQUENCE (i.e. no more specific type), you can have asn1::SequenceOf<'a, asn1::Sequence<'a>>

[joshwatson]

I believe this does answer my question, I'll try this out. Thanks!!

[joshwatson]

Yep looks like it worked, thanks so much!

[alex]

My pleasure! If you have suggestions for how the docs could be more clear, please shout them out!

[joshwatson]

I do have one more question! Is it possible to create a new SequenceOf from like a Vec or similar that I can then serialize back to asn1? I've successfully parsed asn1 and gotten a SequenceOf from it, but I can't figure out how to modify the data within and round-trip it back to asn1; if I iterate over it, it of course consumes the elements and I end up serializing an empty SequenceOf back to asn1.

[alex]

SequenceOfWriter is probably what you want. בתאריך יום ג׳, 30 בנוב׳ 2021, 16:17, מאת Josh Watson ‏< ***@***.***>:

…

I do have one more question! Is it possible to create a new SequenceOf from like a Vec or similar that I can then serialize back to asn1? I've successfully parsed asn1 and gotten a SequenceOf from it, but I can't figure out how to modify the data within and round-trip it back to asn1; if I iterate over it, it of course consumes the elements and I end up serializing an empty SequenceOf back to asn1. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#232 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAAGBD7KEZIY5MNUYFWYHDUOU5ODANCNFSM5IC23OIA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.