Suricata

applayer.rs and frames.rs share the same problem : we want to bindgen a C function like `AppLayerFrameNewByRelativeOffset` which uses as argument of type `StreamSlice` which is defined in rust

This is going to be the difficult part.
There are some easier things to do first

Goal : make
git grep 'extern "C" {' rust/src/
return nothing

AppLayerRegisterParser difficulty is that AppLayerParserFPtr uses StreamSlice as an argument and it is defined in rust...

Philippe Antoine wrote in #note-7:

AppLayerRegisterParser difficulty is that AppLayerParserFPtr uses StreamSlice as an argument and it is defined in rust...

Solutions :
- move StreamSlice definition to C
- Have function prototype use a void*, then cast

• AppLayerEventType
• AppLayerGetFileState
• AppLayerGetTxIterTuple
• AppLayerTxData
• AppLayerTxConfig
• AppLayerStateData

@Jason Ish, what do you think about moving definitions to C ?