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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */ |
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/* Copyright 2012 Mozilla Foundation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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/* globals VBArray, PDFJS */ |
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|
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'use strict'; |
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|
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// Initializing PDFJS global object here, it case if we need to change/disable |
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// some PDF.js features, e.g. range requests |
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if (typeof PDFJS === 'undefined') { |
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(typeof window !== 'undefined' ? window : this).PDFJS = {}; |
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} |
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|
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// Checking if the typed arrays are supported |
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// Support: iOS<6.0 (subarray), IE<10, Android<4.0 |
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(function checkTypedArrayCompatibility() { |
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if (typeof Uint8Array !== 'undefined') { |
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// Support: iOS<6.0 |
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if (typeof Uint8Array.prototype.subarray === 'undefined') { |
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Uint8Array.prototype.subarray = function subarray(start, end) { |
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return new Uint8Array(this.slice(start, end)); |
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}; |
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Float32Array.prototype.subarray = function subarray(start, end) { |
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return new Float32Array(this.slice(start, end)); |
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}; |
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} |
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|
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// Support: Android<4.1 |
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if (typeof Float64Array === 'undefined') { |
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window.Float64Array = Float32Array; |
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} |
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return; |
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} |
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|
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function subarray(start, end) { |
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return new TypedArray(this.slice(start, end)); |
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} |
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|
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function setArrayOffset(array, offset) { |
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if (arguments.length < 2) { |
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offset = 0; |
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} |
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for (var i = 0, n = array.length; i < n; ++i, ++offset) { |
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this[offset] = array[i] & 0xFF; |
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} |
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} |
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|
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function TypedArray(arg1) { |
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var result, i, n; |
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if (typeof arg1 === 'number') { |
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result = []; |
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for (i = 0; i < arg1; ++i) { |
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result[i] = 0; |
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} |
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} else if ('slice' in arg1) { |
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result = arg1.slice(0); |
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} else { |
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result = []; |
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for (i = 0, n = arg1.length; i < n; ++i) { |
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result[i] = arg1[i]; |
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} |
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} |
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|
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result.subarray = subarray; |
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result.buffer = result; |
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result.byteLength = result.length; |
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result.set = setArrayOffset; |
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|
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if (typeof arg1 === 'object' && arg1.buffer) { |
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result.buffer = arg1.buffer; |
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} |
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return result; |
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} |
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|
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window.Uint8Array = TypedArray; |
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window.Int8Array = TypedArray; |
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|
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// we don't need support for set, byteLength for 32-bit array |
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// so we can use the TypedArray as well |
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window.Uint32Array = TypedArray; |
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window.Int32Array = TypedArray; |
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window.Uint16Array = TypedArray; |
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window.Float32Array = TypedArray; |
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window.Float64Array = TypedArray; |
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})(); |
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|
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// URL = URL || webkitURL |
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// Support: Safari<7, Android 4.2+ |
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(function normalizeURLObject() { |
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if (!window.URL) { |
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window.URL = window.webkitURL; |
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} |
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})(); |
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|
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// Object.defineProperty()? |
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// Support: Android<4.0, Safari<5.1 |
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(function checkObjectDefinePropertyCompatibility() { |
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if (typeof Object.defineProperty !== 'undefined') { |
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var definePropertyPossible = true; |
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try { |
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// some browsers (e.g. safari) cannot use defineProperty() on DOM objects |
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// and thus the native version is not sufficient |
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Object.defineProperty(new Image(), 'id', { value: 'test' }); |
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// ... another test for android gb browser for non-DOM objects |
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var Test = function Test() {}; |
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Test.prototype = { get id() { } }; |
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Object.defineProperty(new Test(), 'id', |
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{ value: '', configurable: true, enumerable: true, writable: false }); |
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} catch (e) { |
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definePropertyPossible = false; |
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} |
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if (definePropertyPossible) { |
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return; |
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} |
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} |
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|
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Object.defineProperty = function objectDefineProperty(obj, name, def) { |
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delete obj[name]; |
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if ('get' in def) { |
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obj.__defineGetter__(name, def['get']); |
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} |
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if ('set' in def) { |
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obj.__defineSetter__(name, def['set']); |
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} |
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if ('value' in def) { |
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obj.__defineSetter__(name, function objectDefinePropertySetter(value) { |
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this.__defineGetter__(name, function objectDefinePropertyGetter() { |
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return value; |
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}); |
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return value; |
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}); |
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obj[name] = def.value; |
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} |
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}; |
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})(); |
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|
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|
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// No XMLHttpRequest#response? |
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// Support: IE<11, Android <4.0 |
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(function checkXMLHttpRequestResponseCompatibility() { |
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var xhrPrototype = XMLHttpRequest.prototype; |
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var xhr = new XMLHttpRequest(); |
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if (!('overrideMimeType' in xhr)) { |
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// IE10 might have response, but not overrideMimeType |
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// Support: IE10 |
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Object.defineProperty(xhrPrototype, 'overrideMimeType', { |
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value: function xmlHttpRequestOverrideMimeType(mimeType) {} |
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}); |
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} |
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if ('responseType' in xhr) { |
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return; |
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} |
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|
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// The worker will be using XHR, so we can save time and disable worker. |
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PDFJS.disableWorker = true; |
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|
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Object.defineProperty(xhrPrototype, 'responseType', { |
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get: function xmlHttpRequestGetResponseType() { |
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return this._responseType || 'text'; |
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}, |
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set: function xmlHttpRequestSetResponseType(value) { |
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if (value === 'text' || value === 'arraybuffer') { |
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this._responseType = value; |
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if (value === 'arraybuffer' && |
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typeof this.overrideMimeType === 'function') { |
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this.overrideMimeType('text/plain; charset=x-user-defined'); |
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} |
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} |
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} |
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}); |
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|
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// Support: IE9 |
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if (typeof VBArray !== 'undefined') { |
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Object.defineProperty(xhrPrototype, 'response', { |
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get: function xmlHttpRequestResponseGet() { |
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if (this.responseType === 'arraybuffer') { |
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return new Uint8Array(new VBArray(this.responseBody).toArray()); |
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} else { |
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return this.responseText; |
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} |
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} |
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}); |
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return; |
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} |
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|
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Object.defineProperty(xhrPrototype, 'response', { |
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get: function xmlHttpRequestResponseGet() { |
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if (this.responseType !== 'arraybuffer') { |
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return this.responseText; |
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} |
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var text = this.responseText; |
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var i, n = text.length; |
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var result = new Uint8Array(n); |
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for (i = 0; i < n; ++i) { |
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result[i] = text.charCodeAt(i) & 0xFF; |
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} |
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return result.buffer; |
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} |
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}); |
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})(); |
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|
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// window.btoa (base64 encode function) ? |
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// Support: IE<10 |
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(function checkWindowBtoaCompatibility() { |
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if ('btoa' in window) { |
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return; |
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} |
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|
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var digits = |
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='; |
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|
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window.btoa = function windowBtoa(chars) { |
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var buffer = ''; |
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var i, n; |
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for (i = 0, n = chars.length; i < n; i += 3) { |
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var b1 = chars.charCodeAt(i) & 0xFF; |
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var b2 = chars.charCodeAt(i + 1) & 0xFF; |
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var b3 = chars.charCodeAt(i + 2) & 0xFF; |
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var d1 = b1 >> 2, d2 = ((b1 & 3) << 4) | (b2 >> 4); |
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var d3 = i + 1 < n ? ((b2 & 0xF) << 2) | (b3 >> 6) : 64; |
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var d4 = i + 2 < n ? (b3 & 0x3F) : 64; |
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buffer += (digits.charAt(d1) + digits.charAt(d2) + |
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digits.charAt(d3) + digits.charAt(d4)); |
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} |
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return buffer; |
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}; |
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})(); |
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|
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// window.atob (base64 encode function)? |
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// Support: IE<10 |
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(function checkWindowAtobCompatibility() { |
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if ('atob' in window) { |
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return; |
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} |
| 248 |
|
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// https://github.com/davidchambers/Base64.js |
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var digits = |
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='; |
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window.atob = function (input) { |
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input = input.replace(/=+$/, ''); |
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if (input.length % 4 === 1) { |
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throw new Error('bad atob input'); |
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} |
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for ( |
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// initialize result and counters |
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var bc = 0, bs, buffer, idx = 0, output = ''; |
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// get next character |
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buffer = input.charAt(idx++); |
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// character found in table? |
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// initialize bit storage and add its ascii value |
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~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer, |
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// and if not first of each 4 characters, |
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// convert the first 8 bits to one ascii character |
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bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0 |
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) { |
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// try to find character in table (0-63, not found => -1) |
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buffer = digits.indexOf(buffer); |
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} |
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return output; |
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}; |
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})(); |
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|
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// Function.prototype.bind? |
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// Support: Android<4.0, iOS<6.0 |
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(function checkFunctionPrototypeBindCompatibility() { |
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if (typeof Function.prototype.bind !== 'undefined') { |
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return; |
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} |
| 282 |
|
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Function.prototype.bind = function functionPrototypeBind(obj) { |
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var fn = this, headArgs = Array.prototype.slice.call(arguments, 1); |
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var bound = function functionPrototypeBindBound() { |
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var args = headArgs.concat(Array.prototype.slice.call(arguments)); |
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return fn.apply(obj, args); |
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}; |
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return bound; |
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}; |
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})(); |
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|
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// HTMLElement dataset property |
| 294 |
// Support: IE<11, Safari<5.1, Android<4.0 |
| 295 |
(function checkDatasetProperty() { |
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var div = document.createElement('div'); |
| 297 |
if ('dataset' in div) { |
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return; // dataset property exists |
| 299 |
} |
| 300 |
|
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Object.defineProperty(HTMLElement.prototype, 'dataset', { |
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get: function() { |
| 303 |
if (this._dataset) { |
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return this._dataset; |
| 305 |
} |
| 306 |
|
| 307 |
var dataset = {}; |
| 308 |
for (var j = 0, jj = this.attributes.length; j < jj; j++) { |
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var attribute = this.attributes[j]; |
| 310 |
if (attribute.name.substring(0, 5) !== 'data-') { |
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continue; |
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} |
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var key = attribute.name.substring(5).replace(/\-([a-z])/g, |
| 314 |
function(all, ch) { |
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return ch.toUpperCase(); |
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}); |
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dataset[key] = attribute.value; |
| 318 |
} |
| 319 |
|
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Object.defineProperty(this, '_dataset', { |
| 321 |
value: dataset, |
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writable: false, |
| 323 |
enumerable: false |
| 324 |
}); |
| 325 |
return dataset; |
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}, |
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enumerable: true |
| 328 |
}); |
| 329 |
})(); |
| 330 |
|
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// HTMLElement classList property |
| 332 |
// Support: IE<10, Android<4.0, iOS<5.0 |
| 333 |
(function checkClassListProperty() { |
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var div = document.createElement('div'); |
| 335 |
if ('classList' in div) { |
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return; // classList property exists |
| 337 |
} |
| 338 |
|
| 339 |
function changeList(element, itemName, add, remove) { |
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var s = element.className || ''; |
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var list = s.split(/\s+/g); |
| 342 |
if (list[0] === '') { |
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list.shift(); |
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} |
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var index = list.indexOf(itemName); |
| 346 |
if (index < 0 && add) { |
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list.push(itemName); |
| 348 |
} |
| 349 |
if (index >= 0 && remove) { |
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list.splice(index, 1); |
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} |
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element.className = list.join(' '); |
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return (index >= 0); |
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} |
| 355 |
|
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var classListPrototype = { |
| 357 |
add: function(name) { |
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changeList(this.element, name, true, false); |
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}, |
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contains: function(name) { |
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return changeList(this.element, name, false, false); |
| 362 |
}, |
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remove: function(name) { |
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changeList(this.element, name, false, true); |
| 365 |
}, |
| 366 |
toggle: function(name) { |
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changeList(this.element, name, true, true); |
| 368 |
} |
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}; |
| 370 |
|
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Object.defineProperty(HTMLElement.prototype, 'classList', { |
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get: function() { |
| 373 |
if (this._classList) { |
| 374 |
return this._classList; |
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} |
| 376 |
|
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var classList = Object.create(classListPrototype, { |
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element: { |
| 379 |
value: this, |
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writable: false, |
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enumerable: true |
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} |
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}); |
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Object.defineProperty(this, '_classList', { |
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value: classList, |
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writable: false, |
| 387 |
enumerable: false |
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}); |
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return classList; |
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}, |
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enumerable: true |
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}); |
| 393 |
})(); |
| 394 |
|
| 395 |
// Check console compatibility |
| 396 |
// In older IE versions the console object is not available |
| 397 |
// unless console is open. |
| 398 |
// Support: IE<10 |
| 399 |
(function checkConsoleCompatibility() { |
| 400 |
if (!('console' in window)) { |
| 401 |
window.console = { |
| 402 |
log: function() {}, |
| 403 |
error: function() {}, |
| 404 |
warn: function() {} |
| 405 |
}; |
| 406 |
} else if (!('bind' in console.log)) { |
| 407 |
// native functions in IE9 might not have bind |
| 408 |
console.log = (function(fn) { |
| 409 |
return function(msg) { return fn(msg); }; |
| 410 |
})(console.log); |
| 411 |
console.error = (function(fn) { |
| 412 |
return function(msg) { return fn(msg); }; |
| 413 |
})(console.error); |
| 414 |
console.warn = (function(fn) { |
| 415 |
return function(msg) { return fn(msg); }; |
| 416 |
})(console.warn); |
| 417 |
} |
| 418 |
})(); |
| 419 |
|
| 420 |
// Check onclick compatibility in Opera |
| 421 |
// Support: Opera<15 |
| 422 |
(function checkOnClickCompatibility() { |
| 423 |
// workaround for reported Opera bug DSK-354448: |
| 424 |
// onclick fires on disabled buttons with opaque content |
| 425 |
function ignoreIfTargetDisabled(event) { |
| 426 |
if (isDisabled(event.target)) { |
| 427 |
event.stopPropagation(); |
| 428 |
} |
| 429 |
} |
| 430 |
function isDisabled(node) { |
| 431 |
return node.disabled || (node.parentNode && isDisabled(node.parentNode)); |
| 432 |
} |
| 433 |
if (navigator.userAgent.indexOf('Opera') !== -1) { |
| 434 |
// use browser detection since we cannot feature-check this bug |
| 435 |
document.addEventListener('click', ignoreIfTargetDisabled, true); |
| 436 |
} |
| 437 |
})(); |
| 438 |
|
| 439 |
// Checks if possible to use URL.createObjectURL() |
| 440 |
// Support: IE |
| 441 |
(function checkOnBlobSupport() { |
| 442 |
// sometimes IE loosing the data created with createObjectURL(), see #3977 |
| 443 |
if (navigator.userAgent.indexOf('Trident') >= 0) { |
| 444 |
PDFJS.disableCreateObjectURL = true; |
| 445 |
} |
| 446 |
})(); |
| 447 |
|
| 448 |
// Checks if navigator.language is supported |
| 449 |
(function checkNavigatorLanguage() { |
| 450 |
if ('language' in navigator) { |
| 451 |
return; |
| 452 |
} |
| 453 |
PDFJS.locale = navigator.userLanguage || 'en-US'; |
| 454 |
})(); |
| 455 |
|
| 456 |
(function checkRangeRequests() { |
| 457 |
// Safari has issues with cached range requests see: |
| 458 |
// https://github.com/mozilla/pdf.js/issues/3260 |
| 459 |
// Last tested with version 6.0.4. |
| 460 |
// Support: Safari 6.0+ |
| 461 |
var isSafari = Object.prototype.toString.call( |
| 462 |
window.HTMLElement).indexOf('Constructor') > 0; |
| 463 |
|
| 464 |
// Older versions of Android (pre 3.0) has issues with range requests, see: |
| 465 |
// https://github.com/mozilla/pdf.js/issues/3381. |
| 466 |
// Make sure that we only match webkit-based Android browsers, |
| 467 |
// since Firefox/Fennec works as expected. |
| 468 |
// Support: Android<3.0 |
| 469 |
var regex = /Android\s[0-2][^\d]/; |
| 470 |
var isOldAndroid = regex.test(navigator.userAgent); |
| 471 |
|
| 472 |
// Range requests are broken in Chrome 39 and 40, https://crbug.com/442318 |
| 473 |
var isChromeWithRangeBug = /Chrome\/(39|40)\./.test(navigator.userAgent); |
| 474 |
|
| 475 |
if (isSafari || isOldAndroid || isChromeWithRangeBug) { |
| 476 |
PDFJS.disableRange = true; |
| 477 |
PDFJS.disableStream = true; |
| 478 |
} |
| 479 |
})(); |
| 480 |
|
| 481 |
// Check if the browser supports manipulation of the history. |
| 482 |
// Support: IE<10, Android<4.2 |
| 483 |
(function checkHistoryManipulation() { |
| 484 |
// Android 2.x has so buggy pushState support that it was removed in |
| 485 |
// Android 3.0 and restored as late as in Android 4.2. |
| 486 |
// Support: Android 2.x |
| 487 |
if (!history.pushState || navigator.userAgent.indexOf('Android 2.') >= 0) { |
| 488 |
PDFJS.disableHistory = true; |
| 489 |
} |
| 490 |
})(); |
| 491 |
|
| 492 |
// Support: IE<11, Chrome<21, Android<4.4, Safari<6 |
| 493 |
(function checkSetPresenceInImageData() { |
| 494 |
// IE < 11 will use window.CanvasPixelArray which lacks set function. |
| 495 |
if (window.CanvasPixelArray) { |
| 496 |
if (typeof window.CanvasPixelArray.prototype.set !== 'function') { |
| 497 |
window.CanvasPixelArray.prototype.set = function(arr) { |
| 498 |
for (var i = 0, ii = this.length; i < ii; i++) { |
| 499 |
this[i] = arr[i]; |
| 500 |
} |
| 501 |
}; |
| 502 |
} |
| 503 |
} else { |
| 504 |
// Old Chrome and Android use an inaccessible CanvasPixelArray prototype. |
| 505 |
// Because we cannot feature detect it, we rely on user agent parsing. |
| 506 |
var polyfill = false, versionMatch; |
| 507 |
if (navigator.userAgent.indexOf('Chrom') >= 0) { |
| 508 |
versionMatch = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./); |
| 509 |
// Chrome < 21 lacks the set function. |
| 510 |
polyfill = versionMatch && parseInt(versionMatch[2]) < 21; |
| 511 |
} else if (navigator.userAgent.indexOf('Android') >= 0) { |
| 512 |
// Android < 4.4 lacks the set function. |
| 513 |
// Android >= 4.4 will contain Chrome in the user agent, |
| 514 |
// thus pass the Chrome check above and not reach this block. |
| 515 |
polyfill = /Android\s[0-4][^\d]/g.test(navigator.userAgent); |
| 516 |
} else if (navigator.userAgent.indexOf('Safari') >= 0) { |
| 517 |
versionMatch = navigator.userAgent. |
| 518 |
match(/Version\/([0-9]+)\.([0-9]+)\.([0-9]+) Safari\//); |
| 519 |
// Safari < 6 lacks the set function. |
| 520 |
polyfill = versionMatch && parseInt(versionMatch[1]) < 6; |
| 521 |
} |
| 522 |
|
| 523 |
if (polyfill) { |
| 524 |
var contextPrototype = window.CanvasRenderingContext2D.prototype; |
| 525 |
contextPrototype._createImageData = contextPrototype.createImageData; |
| 526 |
contextPrototype.createImageData = function(w, h) { |
| 527 |
var imageData = this._createImageData(w, h); |
| 528 |
imageData.data.set = function(arr) { |
| 529 |
for (var i = 0, ii = this.length; i < ii; i++) { |
| 530 |
this[i] = arr[i]; |
| 531 |
} |
| 532 |
}; |
| 533 |
return imageData; |
| 534 |
}; |
| 535 |
} |
| 536 |
} |
| 537 |
})(); |
| 538 |
|
| 539 |
// Support: IE<10, Android<4.0, iOS |
| 540 |
(function checkRequestAnimationFrame() { |
| 541 |
function fakeRequestAnimationFrame(callback) { |
| 542 |
window.setTimeout(callback, 20); |
| 543 |
} |
| 544 |
|
| 545 |
var isIOS = /(iPad|iPhone|iPod)/g.test(navigator.userAgent); |
| 546 |
if (isIOS) { |
| 547 |
// requestAnimationFrame on iOS is broken, replacing with fake one. |
| 548 |
window.requestAnimationFrame = fakeRequestAnimationFrame; |
| 549 |
return; |
| 550 |
} |
| 551 |
if ('requestAnimationFrame' in window) { |
| 552 |
return; |
| 553 |
} |
| 554 |
window.requestAnimationFrame = |
| 555 |
window.mozRequestAnimationFrame || |
| 556 |
window.webkitRequestAnimationFrame || |
| 557 |
fakeRequestAnimationFrame; |
| 558 |
})(); |
| 559 |
|
| 560 |
(function checkCanvasSizeLimitation() { |
| 561 |
var isIOS = /(iPad|iPhone|iPod)/g.test(navigator.userAgent); |
| 562 |
var isAndroid = /Android/g.test(navigator.userAgent); |
| 563 |
if (isIOS || isAndroid) { |
| 564 |
// 5MP |
| 565 |
PDFJS.maxCanvasPixels = 5242880; |
| 566 |
} |
| 567 |
})(); |
| 568 |
|
| 569 |
// Disable fullscreen support for certain problematic configurations. |
| 570 |
// Support: IE11+ (when embedded). |
| 571 |
(function checkFullscreenSupport() { |
| 572 |
var isEmbeddedIE = (navigator.userAgent.indexOf('Trident') >= 0 && |
| 573 |
window.parent !== window); |
| 574 |
if (isEmbeddedIE) { |
| 575 |
PDFJS.disableFullscreen = true; |
| 576 |
} |
| 577 |
})(); |
| 578 |
|
