Where's the continuation frame handling part in tools/websocket_to_posix_proxy/src/websocket_to_posix_proxy.c?

[guest271314]

I'm working on implementing continuation frame parsing in a WebSocket server in the browser using WICG Direct Sockets TCPServerSocket. Right now the minimal implementation doesn't handle messages from the client over 65536.

Reading this https://emscripten.org/docs/porting/networking.html#full-posix-sockets-over-websocket-proxy-server sounds like this can be used for continuation frame parsing, and/or to pass the raw request to to process. I want to start by just extracting the frame parsing code to see if that works. Where is that specific code located in

This allows a web browser page to run full TCP & UDP connections, act as a server to accept incoming connections, and perform host name lookups and reverse lookups.

I'm stuck in the JavaScript implementation around here

if (opCode === 0x8) {
    console.log("[connection close frame]\n");
    // TODO read payload, for example payload equal to <0x03 0xe9> means 1001:
    //   1001 indicates that an endpoint is "going away", such as a server
    //   going down or a browser having navigated away from a page.
    // More info here: https://tools.ietf.org/html/rfc6455#section-7.4
    return { payload: null, bufferRemainingBytes: null };
  }
  console.log({opCode, payloadLength});
  if (opCode !== 0x2 && opCode !== 0x0) {
    throw new Error("Only binary and continuation frames are supported");
  }

  if (payloadLength > 125) {
    if (payloadLength === 126) {
      if (currentOffset + 2 > buffer.length) {
        return { payload: null, bufferRemainingBytes: buffer };
      }
      payloadLength = view.getUint16(currentOffset);
      currentOffset += 2;
    } else {
       throw new Error("Payload equal or bigger than 64 KiB is not supported");
    }
  }