serenity/Tests/LibWeb/Text/input/Streams/ReadableStreamBYOBReader-read.html

<script src="../include.js"></script>
<script>
 async function testByobRead(type) {
    const array = ['This is some data to be read! 🦬'];
    let blob = new Blob(array);

    const stream = blob.stream();
    const reader = stream.getReader({ mode: "byob" });

    let buffer = new ArrayBuffer(200);
    let bytesReceived = 0;
    let offset = 0;

    println(`About to read into ${type.prototype.constructor.name} with ${reader}`);

    while (true) {
      let result = await reader.read(new type(buffer, offset, buffer.byteLength - offset));

      if (result.done) {
        println(`Total bytes: ${bytesReceived}`);
        println(`'${new TextDecoder().decode(result.value.buffer.slice(0, bytesReceived))}'`);
        return;
      }

      buffer = result.value.buffer;
      offset += result.value.byteLength;
      bytesReceived += result.value.byteLength;
    }
  }

  asyncTest(async done => {
    await testByobRead(Uint8Array);
    await testByobRead(DataView);
    done();
  });
</script>