imagedecoder-bmp-in-ico-crash.https.html

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This WPT test may be referenced by the following Test IDs:
- /webcodecs/imagedecoder-bmp-in-ico-crash.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script>

(async () => {

  const W = 255, H = 255;

  const maskRowSize = Math.floor((W + 31) / 32) * 4;

  const maskBytes = maskRowSize * H;

  const bytesInRes = 40 + 12 + maskBytes;

  function buildChunk1() {

    const c = new Uint8Array(62);

    c.set([0,0, 1,0, 1,0], 0);

    c[6] = W; c[7] = H;

    c[10] = 1; c[12] = 32;

    c[14] = bytesInRes & 0xff;

    c[15] = (bytesInRes >> 8) & 0xff;

    c[16] = (bytesInRes >> 16) & 0xff;

    c[17] = (bytesInRes >> 24) & 0xff;

    c[18] = 22;

    const bih = new DataView(c.buffer, 22, 40);

    bih.setUint32(0, 40, true);

    bih.setInt32(4, W, true);

    bih.setInt32(8, H * 2, true);

    bih.setUint16(12, 1, true);

    bih.setUint16(14, 32, true);

    bih.setUint32(16, 3, true);

    bih.setUint32(20, 0, true);

    return c;

  function buildChunk2() {

    const c = new Uint8Array(12 + maskBytes);

    const bf = new DataView(c.buffer, 0, 12);

    bf.setUint32(0, 0x00FF0000, true);

    bf.setUint32(4, 0x0000FF00, true);

    bf.setUint32(8, 0x000000FF, true);

    return c;

  let deliver2;

  const stream = new ReadableStream({

    async start(controller) {

      controller.enqueue(buildChunk1());

      await new Promise(r => { deliver2 = r; });

      controller.enqueue(buildChunk2());

      controller.close();

});

  const decoder = new ImageDecoder({

    type: 'image/x-icon',

    data: stream,

    desiredWidth: 16,

    desiredHeight: 16,

});

  await decoder.tracks.ready;

  const decodePromise = decoder.decode();

  await new Promise(r => step_timeout(r, 500));

  deliver2();

  try { await decodePromise; } catch(e) {}

  await new Promise(r => step_timeout(r, 2000));

})();

</script>