484 lines
15 KiB
JavaScript
484 lines
15 KiB
JavaScript
/* -*- 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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'use strict';
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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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// Checking if the typed arrays are supported
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(function checkTypedArrayCompatibility() {
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if (typeof Uint8Array !== 'undefined') {
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// some mobile versions do not support subarray (e.g. safari 5 / iOS)
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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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// some mobile version might not support Float64Array
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if (typeof Float64Array === 'undefined')
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window.Float64Array = Float32Array;
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return;
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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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function setArrayOffset(array, offset) {
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if (arguments.length < 2)
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offset = 0;
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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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function TypedArray(arg1) {
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var result;
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if (typeof arg1 === 'number') {
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result = [];
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for (var i = 0; i < arg1; ++i)
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result[i] = 0;
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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 (var 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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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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if (typeof arg1 === 'object' && arg1.buffer)
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result.buffer = arg1.buffer;
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return result;
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}
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window.Uint8Array = TypedArray;
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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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// URL = URL || webkitURL
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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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// Object.create() ?
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(function checkObjectCreateCompatibility() {
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if (typeof Object.create !== 'undefined')
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return;
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Object.create = function objectCreate(proto) {
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function Constructor() {}
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Constructor.prototype = proto;
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return new Constructor();
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};
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})();
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// Object.defineProperty() ?
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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) return;
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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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if ('set' in def)
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obj.__defineSetter__(name, def['set']);
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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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// Object.keys() ?
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(function checkObjectKeysCompatibility() {
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if (typeof Object.keys !== 'undefined')
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return;
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Object.keys = function objectKeys(obj) {
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var result = [];
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for (var i in obj) {
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if (obj.hasOwnProperty(i))
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result.push(i);
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}
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return result;
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};
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})();
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// No readAsArrayBuffer ?
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(function checkFileReaderReadAsArrayBuffer() {
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if (typeof FileReader === 'undefined')
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return; // FileReader is not implemented
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var frPrototype = FileReader.prototype;
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// Older versions of Firefox might not have readAsArrayBuffer
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if ('readAsArrayBuffer' in frPrototype)
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return; // readAsArrayBuffer is implemented
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Object.defineProperty(frPrototype, 'readAsArrayBuffer', {
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value: function fileReaderReadAsArrayBuffer(blob) {
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var fileReader = new FileReader();
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var originalReader = this;
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fileReader.onload = function fileReaderOnload(evt) {
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var data = evt.target.result;
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var buffer = new ArrayBuffer(data.length);
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var uint8Array = new Uint8Array(buffer);
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for (var i = 0, ii = data.length; i < ii; i++)
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uint8Array[i] = data.charCodeAt(i);
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Object.defineProperty(originalReader, 'result', {
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value: buffer,
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enumerable: true,
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writable: false,
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configurable: true
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});
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var event = document.createEvent('HTMLEvents');
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event.initEvent('load', false, false);
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originalReader.dispatchEvent(event);
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};
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fileReader.readAsBinaryString(blob);
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}
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});
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})();
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// No XMLHttpRequest.response ?
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(function checkXMLHttpRequestResponseCompatibility() {
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var xhrPrototype = XMLHttpRequest.prototype;
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if (!('overrideMimeType' in xhrPrototype)) {
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// IE10 might have response, but not overrideMimeType
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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 ('response' in xhrPrototype ||
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'mozResponseArrayBuffer' in xhrPrototype ||
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'mozResponse' in xhrPrototype ||
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'responseArrayBuffer' in xhrPrototype)
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return;
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// 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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return new Uint8Array(new VBArray(this.responseBody).toArray());
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}
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});
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return;
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}
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// other browsers
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function responseTypeSetter() {
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// will be only called to set "arraybuffer"
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this.overrideMimeType('text/plain; charset=x-user-defined');
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}
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if (typeof xhrPrototype.overrideMimeType === 'function') {
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Object.defineProperty(xhrPrototype, 'responseType',
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{ set: responseTypeSetter });
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}
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function responseGetter() {
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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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return result;
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}
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Object.defineProperty(xhrPrototype, 'response', { get: responseGetter });
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})();
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// window.btoa (base64 encode function) ?
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(function checkWindowBtoaCompatibility() {
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if ('btoa' in window)
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return;
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var digits =
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
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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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// window.atob (base64 encode function) ?
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(function checkWindowAtobCompatibility() {
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if ('atob' in window)
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return;
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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) throw new Error('bad atob input');
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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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// Function.prototype.bind ?
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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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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 = Array.prototype.concat.apply(headArgs, 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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// HTMLElement dataset property
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(function checkDatasetProperty() {
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var div = document.createElement('div');
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if ('dataset' in div)
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return; // dataset property exists
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Object.defineProperty(HTMLElement.prototype, 'dataset', {
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get: function() {
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if (this._dataset)
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return this._dataset;
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var dataset = {};
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for (var j = 0, jj = this.attributes.length; j < jj; j++) {
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var attribute = this.attributes[j];
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if (attribute.name.substring(0, 5) != 'data-')
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continue;
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var key = attribute.name.substring(5).replace(/\-([a-z])/g,
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function(all, ch) { return ch.toUpperCase(); });
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dataset[key] = attribute.value;
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}
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Object.defineProperty(this, '_dataset', {
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value: dataset,
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writable: false,
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enumerable: false
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});
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return dataset;
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},
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enumerable: true
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});
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})();
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// HTMLElement classList property
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(function checkClassListProperty() {
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var div = document.createElement('div');
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if ('classList' in div)
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return; // classList property exists
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function changeList(element, itemName, add, remove) {
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var s = element.className || '';
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var list = s.split(/\s+/g);
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if (list[0] === '') list.shift();
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var index = list.indexOf(itemName);
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if (index < 0 && add)
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list.push(itemName);
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if (index >= 0 && remove)
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list.splice(index, 1);
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element.className = list.join(' ');
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return (index >= 0);
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}
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var classListPrototype = {
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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);
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},
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remove: function(name) {
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changeList(this.element, name, false, true);
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},
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toggle: function(name) {
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changeList(this.element, name, true, true);
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}
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};
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Object.defineProperty(HTMLElement.prototype, 'classList', {
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get: function() {
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if (this._classList)
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return this._classList;
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var classList = Object.create(classListPrototype, {
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element: {
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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,
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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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});
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})();
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// Check console compatibility
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(function checkConsoleCompatibility() {
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if (!('console' in window)) {
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window.console = {
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log: function() {},
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error: function() {},
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warn: function() {}
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};
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} else if (!('bind' in console.log)) {
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// native functions in IE9 might not have bind
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console.log = (function(fn) {
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return function(msg) { return fn(msg); };
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})(console.log);
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console.error = (function(fn) {
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return function(msg) { return fn(msg); };
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})(console.error);
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console.warn = (function(fn) {
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return function(msg) { return fn(msg); };
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})(console.warn);
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}
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})();
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// Check onclick compatibility in Opera
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(function checkOnClickCompatibility() {
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// workaround for reported Opera bug DSK-354448:
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// onclick fires on disabled buttons with opaque content
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function ignoreIfTargetDisabled(event) {
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if (isDisabled(event.target)) {
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event.stopPropagation();
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}
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}
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function isDisabled(node) {
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return node.disabled || (node.parentNode && isDisabled(node.parentNode));
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}
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if (navigator.userAgent.indexOf('Opera') != -1) {
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// use browser detection since we cannot feature-check this bug
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document.addEventListener('click', ignoreIfTargetDisabled, true);
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}
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})();
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// Checks if navigator.language is supported
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(function checkNavigatorLanguage() {
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if ('language' in navigator)
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return;
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Object.defineProperty(navigator, 'language', {
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get: function navigatorLanguage() {
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var language = navigator.userLanguage || 'en-US';
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return language.substring(0, 2).toLowerCase() +
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language.substring(2).toUpperCase();
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},
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enumerable: true
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});
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})();
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(function checkRangeRequests() {
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// Safari has issues with cached range requests see:
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// https://github.com/mozilla/pdf.js/issues/3260
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// Last tested with version 6.0.4.
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var isSafari = Object.prototype.toString.call(
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window.HTMLElement).indexOf('Constructor') > 0;
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// Older versions of Android (pre 3.0) has issues with range requests, see:
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// https://github.com/mozilla/pdf.js/issues/3381.
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// Make sure that we only match webkit-based Android browsers,
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// since Firefox/Fennec works as expected.
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var regex = /Android\s[0-2][^\d]/;
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var isOldAndroid = regex.test(navigator.userAgent);
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if (isSafari || isOldAndroid) {
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PDFJS.disableRange = true;
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}
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})();
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// Check if the browser supports manipulation of the history.
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(function checkHistoryManipulation() {
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if (!window.history.pushState) {
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PDFJS.disableHistory = true;
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}
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})();
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