What I'm doing in d8
function encodeMessage(str) { return new Uint8Array([...str].map((s) =>
s.codePointAt())); } // ... const stdin = os.system("./readFile.js", [
`/proc/${pid.replace(/\D+/g, "")}/fd/0`, ]); if (stdin != undefined &&
stdin != null && stdin.length) { const data = encodeMessage(stdin); const
size = data.subarray(0, 4); const view = new DataView(size.buffer); const
length = view.getUint32(0, true);
sendMessage(encodeMessage(JSON.stringify({ length, size: [...size] })));
const message = data.subarray(4); // ...
On Sunday, July 7, 2024 at 9:20:17 AM UTC-7 guest271314 wrote:
> Right now I'm using QuickJS to read standard input stream to d8 with
> os.system(), to get around readline() not being capable of processing
> Uint32Array from Chrome.
>
> How would I go about translating working QuickJS code to extending d8 to
> read standard input into TypedArray's?
>
> #!/usr/bin/env -S /home/user/bin/qjs -m --std
> // Read stdin to V8's d8, send to d8
> // const stdin = os.system("./read_d8_stdin.js",
> [`/proc/${pid.replace(/\D+/g, "")}/fd/0`]);
> function read_d8_stdin([, path] = scriptArgs) {
> try {
> // Uint32Array to read message length into
> const size = new Uint32Array(1);
> const err = {
> errno: 0
> };
> // Open /proc/PID/fd/0 for reading
> const pipe = std.open(
> path,
> "rb",
> err,
> );
> if (err.errno !== 0) {
> throw `${std.strerror(err.errno)}: ${path}`;
> }
> // Read /proc/PID/fd/0 into Uint32Array
> pipe.read(size.buffer, 0, 4);
> // Uint8Array to read message into
> const output = new Uint8Array(size[0]);
> // Read /proc/PID/fd/0 into Uint8Array
> pipe.read(output.buffer, 0, output.length);
> // Uint8Array containing Uint32Array buffer in Uint8Array and
> Uint8Array containing message
> const data = new Uint8Array([...new Uint8Array(size.buffer),
> ...output]);
> // Write Uint8Array to d8's stdin
> std.out.write(data.buffer, 0, data.length);
> std.out.flush();
> // Exit and start again initiated from d8
> std.exit(0);
> } catch (e) {
> // Handle error
> const err = {
> errno: 0
> };
> const file = std.open("qjsErr.txt", "w", err);
> if (err.errno !== 0) {
> file.puts(JSON.stringify(err));
> file.close();
> std.exit(1);
> }
> file.puts(JSON.stringify(e));
> file.close();
> std.out.puts(JSON.stringify(err));
> std.exit(1);
> }
> }
>
> read_d8_stdin();
>
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