test_arraybufferinputstream_large.html

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<html>

<head>

  <meta charset="utf-8">

  <title>ArrayBuffer stream with large ArrayBuffer test</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

<script type="text/javascript">

add_task(async function testLargeArrayBuffer() {

  let ab = new ArrayBuffer(4.5 * 1024 * 1024 * 1024); // 4.5 GB.

  let ta = new Uint8Array(ab);

  const { Cc, Ci } = SpecialPowers;

  let abis = Cc["@mozilla.org/io/arraybuffer-input-stream;1"]

               .createInstance(Ci.nsIArrayBufferInputStream);

  let sis = Cc["@mozilla.org/scriptableinputstream;1"]

              .createInstance(Ci.nsIScriptableInputStream);

  sis.init(abis);

  // The stream currently doesn't support more than UINT32_MAX bytes.

  let ex;

  try {

    abis.setData(ab, 0, ab.byteLength);

  } catch (e) {

    ex = e;

  is(ex.message.includes("NS_ERROR_ILLEGAL_VALUE"), true, "Expecting exception");

  // Reading a small slice of the large ArrayBuffer is fine, even near the end.

  ta[ta.length - 10] = "a".charCodeAt(0);

  ta[ta.length - 9] = "b".charCodeAt(0);

  ta[ta.length - 8] = "c".charCodeAt(0);

  abis.setData(ab, ab.byteLength - 10, 2);

  is(sis.read(1), "a", "should read 'a' after init");

  is(sis.read(1), "b", "should read 'b' after 'a'");

  is(sis.read(1), "", "Should be done reading data");

});

</script>

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<body>

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