[pasxizeis]

As a means to learn about both WebAssembly and Rust, I started writing a WebAssembly binary decoder (i.e. a parser for `.wasm` files) from scratch.

Recently it hit v2.0 spec conformance. 3.0 is next on the roadmap. (I'm executing it against the upstream spec test suite.)

I don't plan to make it a highly-performant decoder for use in production environments, but rather one that can be used for educational purposes, easy to read and/or debugging issues with modules. That's why I decided not to offer a streaming API, and why I'll be focusing on things like good errors, good code docs etc.

https://github.com/agis/wadec

P.S. I'm new to the language so any feedback is more than welcome.

[zephen]

This is cool.

I started to look at the wasm stuff, but all the documentation I found was so high-level as to be meaningless.

What do you recommend for someone who would want to be able to create or read .wasm files?

[pasxizeis]

I'd say jump straight to the specification (maybe v2, which is simpler).

But I occasionally saw one or two articles around where they explain how the binary format works, which could be a good introduction before jumping to the spec.