serenity/Tests/LibWeb/Text/input/Streams/ReadableByteStream-enqueue-respond.html

<script src="../include.js"></script>
<script>
function makeReadableByteStream() {
  return new ReadableStream({
    type: "bytes",
    start(controller) {
        const array = new Uint8Array([60, 61, 62, 63, 64, 65, 66, 67, 68, 69]);
        println(`Enqueuing array ${array} onto ${controller}`);
        controller.enqueue(array);
    },
    async pull(controller) {
      println(`${controller.byobRequest} view: '${controller.byobRequest.view}'`);
      const v = controller.byobRequest.view;
      println(`Got view of buffer: ${new Uint8Array(v.buffer)}, offset ${v.byteOffset}, length ${v.byteLength}`);
      controller.byobRequest.respond(1);
    },
  });
}

asyncTest(async done => {
  let readableStream = makeReadableByteStream();
  const reader = readableStream.getReader({ mode: "byob" });
  let startingAB = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
  const buffer = await readInto(startingAB);
  println(`Final data: ${new Uint8Array(buffer)}`);
  done();

  async function readInto(buffer) {
    let offset = 0;
    while (offset < buffer.byteLength) {
      let u8 = new Uint8Array(buffer, offset, buffer.byteLength - offset)
      const { value: view, done } = await reader.read(u8);
      buffer = view.buffer;
      if (done) {
        break;
      }
      offset += view.byteLength;
    }

    return buffer;
  }
});
</script>