2017-04-23 00:25:33 +02:00
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<!DOCTYPE html>
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<html>
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<head>
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<title>Detection Test</title>
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<style>
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.notRun {
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color: lightgray;
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}
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.loud .status{
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color: red;
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}
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.stealthy .status{
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color: darkgreen;
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}
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.failed {
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background-color: red;
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}
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</style>
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</head>
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<body>
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<ul id="tests"></ul>
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<script>
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var addTest = (function(){
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var stati = [
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{className: "notRun", text: "not run"},
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{className: "loud", text: "CB detected"},
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{className: "stealthy", text: "CB not detected"},
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{className: "failed", text: "test failed"}
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];
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var ul = document.getElementById("tests");
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return function addTest(name, func){
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var logs = [];
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function log(){
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2017-07-18 16:19:56 +02:00
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logs.push(Array.prototype.slice.call(arguments).join(" "));
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2017-04-23 00:25:33 +02:00
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}
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var status = 0;
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try {
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status = func(log)? 1: 2;
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}
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catch (e){
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2017-07-18 16:19:56 +02:00
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console.log(e);
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2017-04-23 00:25:33 +02:00
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status = 3;
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}
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var li = document.createElement("li");
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li.className = stati[status].className;
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var nameNode = document.createElement("span");
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nameNode.className = "name";
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nameNode.textContent = name;
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nameNode.title = func.toString();
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li.appendChild(nameNode);
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li.appendChild(document.createTextNode(": "));
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var statusNode = document.createElement("span");
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statusNode.className = "status";
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statusNode.textContent = stati[status].text;
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statusNode.title = logs.join("\n");
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li.appendChild(statusNode);
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ul.appendChild(li);
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}
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}());
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2017-07-18 16:19:56 +02:00
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addTest("function length", function(log){
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if (CanvasRenderingContext2D.prototype.getImageData.length !== 4){
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log("expected 4 parameters for getImageData - got", CanvasRenderingContext2D.prototype.getImageData.length);
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return true;
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}
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else {
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return false;
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}
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});
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addTest("function code", function(log){
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if (!CanvasRenderingContext2D.prototype.getImageData.toString().match(/^\s*function getImageData\s*\(\)\s*\{\s*\[native code\]\s*\}\s*$/)){
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log("unexpected function code:", CanvasRenderingContext2D.prototype.getImageData.toString());
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return true;
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}
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else {
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return false;
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}
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});
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2017-06-29 07:35:37 +02:00
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addTest("function name", function(){return CanvasRenderingContext2D.prototype.getImageData.name !== "getImageData"});
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2017-04-23 00:25:33 +02:00
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addTest("error provocation 1", function(log){
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var canvas = document.createElement('canvas');
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var ctx = canvas.getContext("2d");
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var canvasBlocker = false;
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try{
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ctx.getImageData(0, 0, 0, 0);
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}
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catch (err){
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try {
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log(err.name);
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}
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catch (e){
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canvasBlocker = true;
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}
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}
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return canvasBlocker;
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});
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addTest("error provocation 2", function(log){
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var canvas = document.createElement('canvas');
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canvas.width = 0;
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var ctx = canvas.getContext("2d");
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var canvasBlocker = false;
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try{
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ctx.getImageData(0, 0, 1, 1);
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}
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catch (err){
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try {
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log(err.name);
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}
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catch (e){
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canvasBlocker = true;
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}
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}
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return canvasBlocker;
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});
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addTest("error provocation 3", function(log){
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var canvasBlocker = false;
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try{
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CanvasRenderingContext2D.prototype.getImageData.apply(undefined, [0, 0, 1, 1]);
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}
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catch (err){
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try {
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log(err.name);
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}
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catch (e){
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canvasBlocker = true;
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}
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}
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return canvasBlocker;
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});
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2017-07-18 16:19:56 +02:00
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function testKnownPixelValue(size, log){
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var canvas = document.createElement("canvas");
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canvas.height = size;
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canvas.width = size;
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var context = canvas.getContext("2d");
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context.fillStyle = "rgba(0, 127, 255, 1)";
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var pixelValues = [0, 127, 255, 255];
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context.fillRect(0, 0, canvas.width, canvas.height);
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var p = context.getImageData(0, 0, canvas.width, canvas.height).data;
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for (var i = 0; i < p.length; i += 1){
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if (p[i] !== pixelValues[i%4]){
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log("wrong value", p[i], "at", i, "expected", pixelValues[i%4]);
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return true;
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}
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}
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return false;
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}
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addTest("known pixel value test 1", function(log){
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return testKnownPixelValue(1, log);
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});
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addTest("known pixel value test 10", function(log){
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return testKnownPixelValue(10, log);
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});
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2017-07-18 23:53:24 +02:00
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addTest("double readout test", function(log){
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var canvas = document.createElement("canvas");
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var context = canvas.getContext("2d");
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var imageData = context.getImageData(0, 0, canvas.width, canvas.height);
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for (var i = 0; i < imageData.data.length; i += 1){
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if (i % 4 !== 3){
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imageData.data[i] = Math.floor(256 * Math.random());
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}
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else {
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imageData.data[i] = 255;
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}
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}
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context.putImageData(imageData, 0, 0);
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var imageData1 = context.getImageData(0, 0, canvas.width, canvas.height);
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var imageData2 = context.getImageData(0, 0, canvas.width, canvas.height);
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for (var i = 0; i < imageData2.data.length; i += 1){
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if (imageData1.data[i] !== imageData2.data[i]){
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log("mismatch at", i, ":",
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imageData1.data[i], "(", imageData1.data[i].toString(2), ")",
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"!=",
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imageData2.data[i], "(", imageData2.data[i].toString(2), ")",
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"| original:", imageData.data[i], "(", imageData.data[i].toString(2), ")");
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return true;
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}
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}
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return false;
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});
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2017-04-23 00:25:33 +02:00
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</script>
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</body>
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</html>
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