Greetings, We attempt to do the following: s

Greetings again! Let me answer my own question above. <p dir="au

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HOWTO decode a serialized protobuf (in C) within Rust (prost crate)? about prost HOT 2 OPEN

tamama commented on June 2, 2024

HOWTO decode a serialized protobuf (in C) within Rust (prost crate)?

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Comments (2)

tamama commented on June 2, 2024

Greetings again!

Let me answer my own question above.

It turns out that the serialized protobuf contains a lot of '\0', which obviously would mess up your C-string.
(To confirm, you can verify using your-cxx-string.size() with std::strlen(your-c-string))

The following code would then circumvent this situation...

#[no_mangle]
pub unsafe fn Rust__plugin__input__http_poller__constructor(serialized__protobuf__plugin__configuration: *const u8,
                                                            sizeof__serialized__protobuf__plugin__configuration: usize)
        -> *mut SofiaPlugin__input__http_poller
{
    let protobuf__plugin__configuration: Option<::prost_types::Struct>
        = ::prost_types::Struct::decode(::std::slice::from_raw_parts(serialized__protobuf__plugin__configuration,
                                                                     sizeof__serialized__protobuf__plugin__configuration))
                .ok();

    info!("[constructor] protobuf__plugin__configuration: {:?}", protobuf__plugin__configuration);

    let mut ctx: Box<context::Context> = context::Background();
    match SofiaPlugin__input__http_poller::new(ctx.as_ref(), protobuf__plugin__configuration) {
        Err(_) => ::std::ptr::null_mut(),
        Ok(plugin) => Box::into_raw(plugin),
    }
}

You would then see that Prost (Rust) desearializing your C-serialized protocol-buffers correctly!

Cheers!
Tama MA

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