I'm working on implementing 64 MiB input support for the Native Messaging hosts I've written, and gotten a bunch of help writing.

So far I've completed JavaScript that works using node, deno, and bun; Bytecode Alliance's javy which depends on QuickJS (Rust crate) to compile JavaScript source to WASM; and AssemblyScript (see Parsing JSON manually - #11 by guest271314).

This is the protocol Native messaging  |  Chrome for Developers

Chrome starts each native messaging host in a separate process and communicates with it using standard input (stdin ) and standard output (stdout ). The same format is used to send messages in both directions; each message is serialized using JSON, UTF-8 encoded and is preceded with 32-bit message length in native byte order. The maximum size of a single message from the native messaging host is 1 MB, mainly to protect Chrome from misbehaving native applications. The maximum size of the message sent to the native messaging host is 64 MiB.

What I'm working wiith right now NativeMessagingHosts/nm_rust.rs at main · guest271314/NativeMessagingHosts · GitHub.

I am not a Rustacean; I don't write Rust everyday. I think getMessage() doesn't have to change; only sendMessage() needs to be modified to parse, extract, and send valid JSON (encoded as u8 in the working code I've got) back to the browser

pub fn sendMessage(message: &[u8]) -> io::Result<()> {
  let mut stdout = io::stdout();
  let length = message.len() as u32;
  stdout.write_all(&length.to_ne_bytes())?;
  stdout.write_all(message)?;
  stdout.flush()?;
  Ok(())
}

How would you go about doing that?

Related: How to implement a Native Messaging host using only Rust standard library?

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