file-mapped-arraybuffers.js

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// |reftest| skip-if(!xulRuntime.shell)

// Any copyright is dedicated to the Public Domain.

// http://creativecommons.org/licenses/publicdomain/

function viewToString(view)

  return String.fromCharCode.apply(null, view);

function test() {

    var filename = "file-mapped-arraybuffers.txt";

    var buffer = createMappedArrayBuffer(filename);

    var view = new Uint8Array(buffer);

    assertEq(viewToString(view), "01234567abcdefghijkl");

    var buffer2 = createMappedArrayBuffer(filename, 8);

    view = new Uint8Array(buffer2);

    assertEq(viewToString(view), "abcdefghijkl");

    var buffer3 = createMappedArrayBuffer(filename, 0, 8);

    view = new Uint8Array(buffer3);

    assertEq(viewToString(view), "01234567");

    // Test detaching during subarray creation.

    var nasty = {

      valueOf: function () {

        print("detaching...");

        serialize(buffer3, [buffer3]);

        print("detached");

        return 3000;

};

    var a = new Uint8Array(buffer3);

    assertThrowsInstanceOf(() => {

        var aa = a.subarray(0, nasty);

        for (i = 0; i < 3000; i++)

            aa[i] = 17;

    }, TypeError);

    // Check that invalid sizes and offsets are caught

    assertThrowsInstanceOf(() => createMappedArrayBuffer("empty.txt", 8), RangeError);

    assertThrowsInstanceOf(() => createMappedArrayBuffer("empty.txt", 0, 8), Error);

if (getBuildConfiguration("mapped-array-buffer"))

    test();

reportCompare(0, 0, 'ok');