88 lines
2.3 KiB
JavaScript
88 lines
2.3 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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(function(){
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"use strict";
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let scope;
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if ((typeof exports) !== "undefined"){
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scope = exports;
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}
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else {
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scope = require.register("./modifiedSVGAPI", {});
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}
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const {checkerWrapper, setProperties, getStatusByFlag} = require("./modifiedAPIFunctions");
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const {byteArrayToString: hash} = require("./hash");
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let randomSupply = null;
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scope.setRandomSupply = function(supply){
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randomSupply = supply;
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};
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function getValueHash(value){
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return hash(new Float32Array([value]));
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}
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const cache = {};
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function getFakeValue(value, window){
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const valueHash = getValueHash(value);
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let cachedValue = cache[valueHash];
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if (typeof cachedValue === "number"){
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return cachedValue;
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}
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else {
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const rng = randomSupply.getRng(1, window);
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const fakedValue = value + 0.01 * (rng(0) / 0xffffffff - 0.5);
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const fakedHash = getValueHash(fakedValue);
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cache[valueHash] = fakedValue;
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cache[fakedHash] = fakedValue;
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return fakedValue;
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}
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}
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scope.getFakeValue = getFakeValue;
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function getFakeValueCallback(args, check){
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const {notify, window, original} = check;
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const ret = args.length? original.call(this, ...args): original.call(this);
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notify("fakedSVGReadout");
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return getFakeValue(ret, window);
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}
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scope.changedFunctions = {
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getTotalLength: {
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object: ["SVGGeometryElement"],
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fakeGenerator: function(checker){
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return function getTotalLength(){
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return checkerWrapper(checker, this, arguments, getFakeValueCallback);
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};
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}
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},
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getComputedTextLength: {
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object: ["SVGTextContentElement"],
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fakeGenerator: function(checker){
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return function getComputedTextLength(){
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return checkerWrapper(checker, this, arguments, getFakeValueCallback);
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};
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}
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},
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getSubStringLength: {
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object: ["SVGTextContentElement"],
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fakeGenerator: function(checker){
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return function getSubStringLength(charnum, nchars){
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return checkerWrapper(checker, this, arguments, getFakeValueCallback);
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};
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}
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},
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};
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scope.changedGetters = [];
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setProperties(scope.changedFunctions, scope.changedGetters, {
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type: "readout",
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getStatus: getStatusByFlag("protectSVG"),
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api: "svg"
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});
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}()); |