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+<!--
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/js-test-pre.js"></script>
+<script src="../../js/test-eval.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+
+<script>
+"use strict";
+description("Test DataView.");
+
+var intArray1 = [0, 1, 2, 3, 100, 101, 102, 103, 128, 129, 130, 131, 252, 253, 254, 255];
+var intArray2 = [31, 32, 33, 0, 1, 2, 3, 100, 101, 102, 103, 128, 129, 130, 131, 252, 253, 254, 255];
+var emptyArray = [204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204];
+
+var arrayBuffer = null;
+var view = null;
+var viewStart = 0;
+var viewLength = 0;
+
+function getElementSize(func)
+{
+ switch (func) {
+ case "Int8":
+ case "Uint8":
+ return 1;
+ case "Int16":
+ case "Uint16":
+ return 2;
+ case "Int32":
+ case "Uint32":
+ case "Float32":
+ return 4;
+ case "Float64":
+ return 8;
+ default:
+ debug("Should not reached");
+ }
+}
+
+function checkGet(func, index, expected, littleEndian)
+{
+ var expr = "view.get" + func + "(" + index;
+ if (littleEndian != undefined) {
+ expr += ", ";
+ expr += littleEndian ? "true" : "false";
+ }
+ expr += ")";
+ if (index >= 0 && index + getElementSize(func) - 1 < view.byteLength)
+ shouldBe(expr, expected);
+ else
+ shouldThrow(expr);
+}
+
+function checkSet(func, index, value, littleEndian)
+{
+ var expr = "view.set" + func + "(" + index + ", " + value;
+ if (littleEndian != undefined) {
+ expr += ", ";
+ expr += littleEndian ? "true" : "false";
+ }
+ expr += ")";
+ if (index >= 0 && index + getElementSize(func) - 1 < view.byteLength) {
+ shouldBeUndefined(expr);
+ checkGet(func, index, value, littleEndian);
+ } else
+ shouldThrow(expr);
+}
+
+function checkGetWithoutArgument(func, expected)
+{
+ var threw = false;
+ var value;
+ try {
+ value = view["get" + func]();
+ } catch (e) {
+ threw = true;
+ }
+
+ if (threw) {
+ // This used to be correct, but TC39 has changed the behavior of these methods.
+ testPassed("view.get" + func + " with no arguments throws.");
+ } else {
+ if (value === expected) {
+ testPassed("view.get" + func + " treats missing argument as 0.");
+ } else {
+ testFailed("view.get" + func + " accepts a missing argument but does not cast it to 0.");
+ }
+ }
+}
+
+function checkSetWithoutSecondArgument(func, index, isFloat)
+{
+ var expected = isFloat ? NaN : 0;
+ var threw = false;
+ var value;
+ try {
+ value = view["set" + func](index);
+ } catch (e) {
+ threw = true;
+ }
+
+ if (threw) {
+ // This used to be correct, but TC39 has changed the behavior of these methods.
+ testPassed("view.set" + func + " with missing second argument throws.");
+ } else {
+ var stored = view["get" + func](index);
+ if (value === undefined && isFloat ? isNaN(stored) : stored === expected) {
+ testPassed("view.set" + func + " treats missing second argument as " + expected + ".");
+ } else {
+ testFailed("view.set" + func + " accepts a missing second argument but does not cast it to " + expected + ".");
+ }
+ }
+}
+
+function checkSetWithoutArguments(func, isFloat)
+{
+ var expected = isFloat ? NaN : 0;
+ var threw = false;
+ var value;
+ try {
+ value = view["set" + func]();
+ } catch (e) {
+ threw = true;
+ }
+
+ if (threw) {
+ // This used to be correct, but TC39 has changed the behavior of these methods.
+ testPassed("view.set" + func + " with no arguments throws.");
+ } else {
+ var stored = view["get" + func](0);
+ if (value === undefined && isFloat ? isNaN(stored) : stored === expected) {
+ testPassed("view.set" + func + " treats missing first argument as 0.");
+ } else {
+ testFailed("view.set" + func + " accepts a missing first argument but does not cast it to 0.");
+ }
+ }
+}
+
+function testMissingArguments(func, constructor, isFloat)
+{
+ view = new DataView((new constructor(3)).buffer);
+ view["set" + func](0, 1);
+ view["set" + func](getElementSize(func), 2);
+ checkGetWithoutArgument(func, 1);
+ checkSetWithoutSecondArgument(func, getElementSize(func), isFloat);
+ view = new DataView((new constructor(3)).buffer);
+ view["set" + func](0, 1);
+ checkSetWithoutArguments(func, isFloat);
+}
+
+function test(isTestingGet, func, index, value, littleEndian)
+{
+ if (isTestingGet)
+ checkGet(func, index, value, littleEndian);
+ else
+ checkSet(func, index, value, littleEndian);
+}
+
+function createDataView(array, frontPaddingNum, littleEndian, start, length)
+{
+ if (!littleEndian)
+ array.reverse();
+ var paddingArray = new Array(frontPaddingNum);
+ arrayBuffer = (new Uint8Array(paddingArray.concat(array))).buffer;
+ viewStart = (start != undefined) ? start : 0;
+ viewLength = (length != undefined) ? length : arrayBuffer.byteLength - viewStart;
+ view = new DataView(arrayBuffer, viewStart, viewLength);
+ if (!littleEndian)
+ array.reverse(); // restore the array.
+}
+
+function runIntegerTestCases(isTestingGet, array, start, length)
+{
+ createDataView(array, 0, true, start, length);
+
+ test(isTestingGet, "Int8", 0, "0");
+ test(isTestingGet, "Int8", 8, "-128");
+ test(isTestingGet, "Int8", 15, "-1");
+
+ test(isTestingGet, "Uint8", 0, "0");
+ test(isTestingGet, "Uint8", 8, "128");
+ test(isTestingGet, "Uint8", 15, "255");
+
+ // Little endian.
+ test(isTestingGet, "Int16", 0, "256", true);
+ test(isTestingGet, "Int16", 5, "26213", true);
+ test(isTestingGet, "Int16", 9, "-32127", true);
+ test(isTestingGet, "Int16", 14, "-2", true);
+
+ // Big endian.
+ test(isTestingGet, "Int16", 0, "1");
+ test(isTestingGet, "Int16", 5, "25958");
+ test(isTestingGet, "Int16", 9, "-32382");
+ test(isTestingGet, "Int16", 14, "-257");
+
+ // Little endian.
+ test(isTestingGet, "Uint16", 0, "256", true);
+ test(isTestingGet, "Uint16", 5, "26213", true);
+ test(isTestingGet, "Uint16", 9, "33409", true);
+ test(isTestingGet, "Uint16", 14, "65534", true);
+
+ // Big endian.
+ test(isTestingGet, "Uint16", 0, "1");
+ test(isTestingGet, "Uint16", 5, "25958");
+ test(isTestingGet, "Uint16", 9, "33154");
+ test(isTestingGet, "Uint16", 14, "65279");
+
+ // Little endian.
+ test(isTestingGet, "Int32", 0, "50462976", true);
+ test(isTestingGet, "Int32", 3, "1717920771", true);
+ test(isTestingGet, "Int32", 6, "-2122291354", true);
+ test(isTestingGet, "Int32", 9, "-58490239", true);
+ test(isTestingGet, "Int32", 12, "-66052", true);
+
+ // Big endian.
+ test(isTestingGet, "Int32", 0, "66051");
+ test(isTestingGet, "Int32", 3, "56911206");
+ test(isTestingGet, "Int32", 6, "1718059137");
+ test(isTestingGet, "Int32", 9, "-2122152964");
+ test(isTestingGet, "Int32", 12, "-50462977");
+
+ // Little endian.
+ test(isTestingGet, "Uint32", 0, "50462976", true);
+ test(isTestingGet, "Uint32", 3, "1717920771", true);
+ test(isTestingGet, "Uint32", 6, "2172675942", true);
+ test(isTestingGet, "Uint32", 9, "4236477057", true);
+ test(isTestingGet, "Uint32", 12, "4294901244", true);
+
+ // Big endian.
+ test(isTestingGet, "Uint32", 0, "66051");
+ test(isTestingGet, "Uint32", 3, "56911206");
+ test(isTestingGet, "Uint32", 6, "1718059137");
+ test(isTestingGet, "Uint32", 9, "2172814332");
+ test(isTestingGet, "Uint32", 12, "4244504319");
+}
+
+function testFloat(isTestingGet, func, array, start, expected)
+{
+ // Little endian.
+ createDataView(array, 0, true, start);
+ test(isTestingGet, func, 0, expected, true);
+ createDataView(array, 3, true, start);
+ test(isTestingGet, func, 3, expected, true);
+ createDataView(array, 7, true, start);
+ test(isTestingGet, func, 7, expected, true);
+ createDataView(array, 10, true, start);
+ test(isTestingGet, func, 10, expected, true);
+
+ // Big endian.
+ createDataView(array, 0, false);
+ test(isTestingGet, func, 0, expected, false);
+ createDataView(array, 3, false);
+ test(isTestingGet, func, 3, expected, false);
+ createDataView(array, 7, false);
+ test(isTestingGet, func, 7, expected, false);
+ createDataView(array, 10, false);
+ test(isTestingGet, func, 10, expected, false);
+}
+
+function runFloatTestCases(isTestingGet, start)
+{
+ testFloat(isTestingGet, "Float32", isTestingGet ? [0, 0, 32, 65] : emptyArray, start, "10");
+ testFloat(isTestingGet, "Float32", isTestingGet ? [164, 112, 157, 63] : emptyArray, start, "1.2300000190734863");
+ testFloat(isTestingGet, "Float32", isTestingGet ? [95, 53, 50, 199] : emptyArray, start, "-45621.37109375");
+ testFloat(isTestingGet, "Float32", isTestingGet ? [255, 255, 255, 127] : emptyArray, start, "NaN");
+ testFloat(isTestingGet, "Float32", isTestingGet ? [255, 255, 255, 255] : emptyArray, start, "-NaN");
+
+ testFloat(isTestingGet, "Float64", isTestingGet ? [0, 0, 0, 0, 0, 0, 36, 64] : emptyArray, start, "10");
+ testFloat(isTestingGet, "Float64", isTestingGet ? [174, 71, 225, 122, 20, 174, 243, 63] : emptyArray, start, "1.23");
+ testFloat(isTestingGet, "Float64", isTestingGet ? [181, 55, 248, 30, 242, 179, 87, 193] : emptyArray, start, "-6213576.4839");
+ testFloat(isTestingGet, "Float64", isTestingGet ? [255, 255, 255, 255, 255, 255, 255, 127] : emptyArray, start, "NaN");
+ testFloat(isTestingGet, "Float64", isTestingGet ? [255, 255, 255, 255, 255, 255, 255, 255] : emptyArray, start, "-NaN");
+}
+
+function runNegativeIndexTests(isTestingGet)
+{
+ createDataView(intArray1, 0, true, 0, 16);
+
+ test(isTestingGet, "Int8", -1, "0");
+ test(isTestingGet, "Int8", -2, "0");
+
+ test(isTestingGet, "Uint8", -1, "0");
+ test(isTestingGet, "Uint8", -2, "0");
+
+ test(isTestingGet, "Int16", -1, "0");
+ test(isTestingGet, "Int16", -2, "0");
+ test(isTestingGet, "Int16", -3, "0");
+
+ test(isTestingGet, "Uint16", -1, "0");
+ test(isTestingGet, "Uint16", -2, "0");
+ test(isTestingGet, "Uint16", -3, "0");
+
+ test(isTestingGet, "Int32", -1, "0");
+ test(isTestingGet, "Int32", -3, "0");
+ test(isTestingGet, "Int32", -5, "0");
+
+ test(isTestingGet, "Uint32", -1, "0");
+ test(isTestingGet, "Uint32", -3, "0");
+ test(isTestingGet, "Uint32", -5, "0");
+
+ createDataView([0, 0, 0, 0, 0, 0, 36, 64], 0, true, 0, 8);
+
+ test(isTestingGet, "Float32", -1, "0");
+ test(isTestingGet, "Float32", -3, "0");
+ test(isTestingGet, "Float32", -5, "0");
+
+ test(isTestingGet, "Float64", -1, "0");
+ test(isTestingGet, "Float64", -5, "0");
+ test(isTestingGet, "Float64", -9, "0");
+}
+
+function runConstructorTests()
+{
+ arrayBuffer = (new Uint8Array([1, 2])).buffer;
+
+ debug("");
+ debug("Test for constructor taking 1 argument");
+ shouldBeDefined("view = new DataView(arrayBuffer)");
+ shouldBe("view.byteOffset", "0");
+ shouldBe("view.byteLength", "2");
+
+ debug("");
+ debug("Test for constructor taking 2 arguments");
+ shouldBeDefined("view = new DataView(arrayBuffer, 1)");
+ shouldBe("view.byteOffset", "1");
+ shouldBe("view.byteLength", "1");
+
+ debug("");
+ debug("Test for constructor taking 3 arguments");
+ shouldBeDefined("view = new DataView(arrayBuffer, 0, 1)");
+ shouldBe("view.byteOffset", "0");
+ shouldBe("view.byteLength", "1");
+
+ debug("");
+ debug("Test for constructor throwing exception");
+ shouldThrow("view = new DataView(arrayBuffer, 0, 3)");
+ shouldThrow("view = new DataView(arrayBuffer, 1, 2)");
+ shouldThrow("view = new DataView(arrayBuffer, 2, 1)");
+}
+
+function runGetTests()
+{
+ debug("");
+ debug("Test for get methods that work");
+ runIntegerTestCases(true, intArray1, 0, 16);
+ runFloatTestCases(true, 0);
+
+ debug("");
+ debug("Test for get methods that might read beyond range");
+ runIntegerTestCases(true, intArray2, 3, 2);
+ runFloatTestCases(true, 3);
+
+ debug("");
+ debug("Test for get methods that read from negative index");
+ runNegativeIndexTests(true);
+}
+
+function runSetTests()
+{
+ debug("");
+ debug("Test for set methods that work");
+ runIntegerTestCases(false, emptyArray, 0, 16);
+ runFloatTestCases(false);
+
+ debug("");
+ debug("Test for set methods that might write beyond the range");
+ runIntegerTestCases(false, emptyArray, 3, 2);
+ runFloatTestCases(false, 7);
+
+ debug("");
+ debug("Test for set methods that write to negative index");
+ runNegativeIndexTests(false);
+}
+
+function runMissingArgumentTests()
+{
+ debug("");
+ debug("Test for get and set methods missing arguments");
+ testMissingArguments("Int8", Int8Array);
+ testMissingArguments("Uint8", Uint8Array);
+ testMissingArguments("Int16", Int16Array);
+ testMissingArguments("Uint16", Uint16Array);
+ testMissingArguments("Int32", Int32Array);
+ testMissingArguments("Uint32", Uint32Array);
+ testMissingArguments("Float32", Float32Array, true);
+ testMissingArguments("Float64", Float64Array, true);
+}
+
+function runIndexingTests()
+{
+ debug("");
+ debug("Test for indexing that should not work");
+ view = new DataView((new Uint8Array([1, 2])).buffer);
+ shouldBeUndefined("view[0]");
+ shouldBeDefined("view[0] = 3");
+ shouldBe("view.getUint8(0)", "1");
+}
+
+runConstructorTests();
+runGetTests();
+runSetTests();
+runMissingArgumentTests();
+runIndexingTests();
+var successfullyParsed = true;
+</script>
+
+<script src="../../js/js-test-post.js"></script>
+</body>
+</html>