netwerk/test/mochitests/test_arraybufferinputstream.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <!--
   4 -->
   5 <head>
   6   <title>ArrayBuffer stream test</title>
   7   <script src="/tests/SimpleTest/SimpleTest.js"></script>
   8   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
   9
  10 <script type="text/javascript">
  11 function detachArrayBuffer(ab)
  12 {
  13   var w = new Worker("data:application/javascript,");
  14   w.postMessage(ab, [ab]);
  15 }
  16
  17 function test()
  18 {
  19   var ab = new ArrayBuffer(4000);
  20   var ta = new Uint8Array(ab);
  21   ta[0] = 'a'.charCodeAt(0);
  22   ta[1] = 'b'.charCodeAt(0);
  23
  24   const Cc = SpecialPowers.Cc, Ci = SpecialPowers.Ci;
  25   var abis = Cc["@mozilla.org/io/arraybuffer-input-stream;1"]
  26                .createInstance(Ci.nsIArrayBufferInputStream);
  27
  28   var sis = Cc["@mozilla.org/scriptableinputstream;1"]
  29               .createInstance(Ci.nsIScriptableInputStream);
  30   sis.init(abis);
  31
  32   is(sis.read(1), "", "should read no data from an uninitialized ABIS");
  33
  34   abis.setData(ab, 0, 256 * 1024);
  35
  36   is(sis.read(1), "a", "should read 'a' after init");
  37
  38   detachArrayBuffer(ab);
  39
  40   SpecialPowers.forceGC();
  41   SpecialPowers.forceGC();
  42
  43   try
  44   {
  45     is(sis.read(1), "b", "should read 'b' after detaching buffer");
  46   }
  47   catch (e)
  48   {
  49     ok(false, "reading from stream should have worked");
  50   }
  51
  52   // A regression test for bug 1265076.  Previously, overflowing
  53   // the internal buffer from readSegments would cause incorrect
  54   // copying.  The constant mirrors the value in
  55   // ArrayBufferInputStream::readSegments.
  56   var size = 8192;
  57   ab = new ArrayBuffer(2 * size);
  58   ta = new Uint8Array(ab);
  59
  60   var i;
  61   for (i = 0; i < size; ++i) {
  62     ta[i] = 'x'.charCodeAt(0);
  63   }
  64   for (i = 0; i < size; ++i) {
  65     ta[size + i] = 'y'.charCodeAt(0);
  66   }
  67
  68   abis = Cc["@mozilla.org/io/arraybuffer-input-stream;1"]
  69            .createInstance(Ci.nsIArrayBufferInputStream);
  70   abis.setData(ab, 0, 2 * size);
  71
  72   sis = Cc["@mozilla.org/scriptableinputstream;1"]
  73           .createInstance(Ci.nsIScriptableInputStream);
  74   sis.init(abis);
  75
  76   var result = sis.read(2 * size);
  77   is(result, "x".repeat(size) + "y".repeat(size), "correctly read the data");
  78 }
  79
  80 test();
  81 </script>
  82 </head>
  83 <body>
  84 <p id="display"></p>
  85 <div id="content" style="display: none"></div>
  86 <pre id="test">
  87 </pre>
  88 </body>
  89 </html>