594 lines
18 KiB
JavaScript
594 lines
18 KiB
JavaScript
/* Copyright 2012 Mozilla Foundation
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
/* globals VBArray, PDFJS */
|
|
|
|
'use strict';
|
|
|
|
// Initializing PDFJS global object here, it case if we need to change/disable
|
|
// some PDF.js features, e.g. range requests
|
|
if (typeof PDFJS === 'undefined') {
|
|
(typeof window !== 'undefined' ? window : this).PDFJS = {};
|
|
}
|
|
|
|
// Checking if the typed arrays are supported
|
|
// Support: iOS<6.0 (subarray), IE<10, Android<4.0
|
|
(function checkTypedArrayCompatibility() {
|
|
if (typeof Uint8Array !== 'undefined') {
|
|
// Support: iOS<6.0
|
|
if (typeof Uint8Array.prototype.subarray === 'undefined') {
|
|
Uint8Array.prototype.subarray = function subarray(start, end) {
|
|
return new Uint8Array(this.slice(start, end));
|
|
};
|
|
Float32Array.prototype.subarray = function subarray(start, end) {
|
|
return new Float32Array(this.slice(start, end));
|
|
};
|
|
}
|
|
|
|
// Support: Android<4.1
|
|
if (typeof Float64Array === 'undefined') {
|
|
window.Float64Array = Float32Array;
|
|
}
|
|
return;
|
|
}
|
|
|
|
function subarray(start, end) {
|
|
return new TypedArray(this.slice(start, end));
|
|
}
|
|
|
|
function setArrayOffset(array, offset) {
|
|
if (arguments.length < 2) {
|
|
offset = 0;
|
|
}
|
|
for (var i = 0, n = array.length; i < n; ++i, ++offset) {
|
|
this[offset] = array[i] & 0xFF;
|
|
}
|
|
}
|
|
|
|
function TypedArray(arg1) {
|
|
var result, i, n;
|
|
if (typeof arg1 === 'number') {
|
|
result = [];
|
|
for (i = 0; i < arg1; ++i) {
|
|
result[i] = 0;
|
|
}
|
|
} else if ('slice' in arg1) {
|
|
result = arg1.slice(0);
|
|
} else {
|
|
result = [];
|
|
for (i = 0, n = arg1.length; i < n; ++i) {
|
|
result[i] = arg1[i];
|
|
}
|
|
}
|
|
|
|
result.subarray = subarray;
|
|
result.buffer = result;
|
|
result.byteLength = result.length;
|
|
result.set = setArrayOffset;
|
|
|
|
if (typeof arg1 === 'object' && arg1.buffer) {
|
|
result.buffer = arg1.buffer;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
window.Uint8Array = TypedArray;
|
|
window.Int8Array = TypedArray;
|
|
|
|
// we don't need support for set, byteLength for 32-bit array
|
|
// so we can use the TypedArray as well
|
|
window.Uint32Array = TypedArray;
|
|
window.Int32Array = TypedArray;
|
|
window.Uint16Array = TypedArray;
|
|
window.Float32Array = TypedArray;
|
|
window.Float64Array = TypedArray;
|
|
})();
|
|
|
|
// URL = URL || webkitURL
|
|
// Support: Safari<7, Android 4.2+
|
|
(function normalizeURLObject() {
|
|
if (!window.URL) {
|
|
window.URL = window.webkitURL;
|
|
}
|
|
})();
|
|
|
|
// Object.defineProperty()?
|
|
// Support: Android<4.0, Safari<5.1
|
|
(function checkObjectDefinePropertyCompatibility() {
|
|
if (typeof Object.defineProperty !== 'undefined') {
|
|
var definePropertyPossible = true;
|
|
try {
|
|
// some browsers (e.g. safari) cannot use defineProperty() on DOM objects
|
|
// and thus the native version is not sufficient
|
|
Object.defineProperty(new Image(), 'id', { value: 'test' });
|
|
// ... another test for android gb browser for non-DOM objects
|
|
var Test = function Test() {};
|
|
Test.prototype = { get id() { } };
|
|
Object.defineProperty(new Test(), 'id',
|
|
{ value: '', configurable: true, enumerable: true, writable: false });
|
|
} catch (e) {
|
|
definePropertyPossible = false;
|
|
}
|
|
if (definePropertyPossible) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
Object.defineProperty = function objectDefineProperty(obj, name, def) {
|
|
delete obj[name];
|
|
if ('get' in def) {
|
|
obj.__defineGetter__(name, def['get']);
|
|
}
|
|
if ('set' in def) {
|
|
obj.__defineSetter__(name, def['set']);
|
|
}
|
|
if ('value' in def) {
|
|
obj.__defineSetter__(name, function objectDefinePropertySetter(value) {
|
|
this.__defineGetter__(name, function objectDefinePropertyGetter() {
|
|
return value;
|
|
});
|
|
return value;
|
|
});
|
|
obj[name] = def.value;
|
|
}
|
|
};
|
|
})();
|
|
|
|
|
|
// No XMLHttpRequest#response?
|
|
// Support: IE<11, Android <4.0
|
|
(function checkXMLHttpRequestResponseCompatibility() {
|
|
var xhrPrototype = XMLHttpRequest.prototype;
|
|
var xhr = new XMLHttpRequest();
|
|
if (!('overrideMimeType' in xhr)) {
|
|
// IE10 might have response, but not overrideMimeType
|
|
// Support: IE10
|
|
Object.defineProperty(xhrPrototype, 'overrideMimeType', {
|
|
value: function xmlHttpRequestOverrideMimeType(mimeType) {}
|
|
});
|
|
}
|
|
if ('responseType' in xhr) {
|
|
return;
|
|
}
|
|
|
|
// The worker will be using XHR, so we can save time and disable worker.
|
|
PDFJS.disableWorker = true;
|
|
|
|
Object.defineProperty(xhrPrototype, 'responseType', {
|
|
get: function xmlHttpRequestGetResponseType() {
|
|
return this._responseType || 'text';
|
|
},
|
|
set: function xmlHttpRequestSetResponseType(value) {
|
|
if (value === 'text' || value === 'arraybuffer') {
|
|
this._responseType = value;
|
|
if (value === 'arraybuffer' &&
|
|
typeof this.overrideMimeType === 'function') {
|
|
this.overrideMimeType('text/plain; charset=x-user-defined');
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
// Support: IE9
|
|
if (typeof VBArray !== 'undefined') {
|
|
Object.defineProperty(xhrPrototype, 'response', {
|
|
get: function xmlHttpRequestResponseGet() {
|
|
if (this.responseType === 'arraybuffer') {
|
|
return new Uint8Array(new VBArray(this.responseBody).toArray());
|
|
} else {
|
|
return this.responseText;
|
|
}
|
|
}
|
|
});
|
|
return;
|
|
}
|
|
|
|
Object.defineProperty(xhrPrototype, 'response', {
|
|
get: function xmlHttpRequestResponseGet() {
|
|
if (this.responseType !== 'arraybuffer') {
|
|
return this.responseText;
|
|
}
|
|
var text = this.responseText;
|
|
var i, n = text.length;
|
|
var result = new Uint8Array(n);
|
|
for (i = 0; i < n; ++i) {
|
|
result[i] = text.charCodeAt(i) & 0xFF;
|
|
}
|
|
return result.buffer;
|
|
}
|
|
});
|
|
})();
|
|
|
|
// window.btoa (base64 encode function) ?
|
|
// Support: IE<10
|
|
(function checkWindowBtoaCompatibility() {
|
|
if ('btoa' in window) {
|
|
return;
|
|
}
|
|
|
|
var digits =
|
|
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
|
|
|
|
window.btoa = function windowBtoa(chars) {
|
|
var buffer = '';
|
|
var i, n;
|
|
for (i = 0, n = chars.length; i < n; i += 3) {
|
|
var b1 = chars.charCodeAt(i) & 0xFF;
|
|
var b2 = chars.charCodeAt(i + 1) & 0xFF;
|
|
var b3 = chars.charCodeAt(i + 2) & 0xFF;
|
|
var d1 = b1 >> 2, d2 = ((b1 & 3) << 4) | (b2 >> 4);
|
|
var d3 = i + 1 < n ? ((b2 & 0xF) << 2) | (b3 >> 6) : 64;
|
|
var d4 = i + 2 < n ? (b3 & 0x3F) : 64;
|
|
buffer += (digits.charAt(d1) + digits.charAt(d2) +
|
|
digits.charAt(d3) + digits.charAt(d4));
|
|
}
|
|
return buffer;
|
|
};
|
|
})();
|
|
|
|
// window.atob (base64 encode function)?
|
|
// Support: IE<10
|
|
(function checkWindowAtobCompatibility() {
|
|
if ('atob' in window) {
|
|
return;
|
|
}
|
|
|
|
// https://github.com/davidchambers/Base64.js
|
|
var digits =
|
|
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
|
|
window.atob = function (input) {
|
|
input = input.replace(/=+$/, '');
|
|
if (input.length % 4 === 1) {
|
|
throw new Error('bad atob input');
|
|
}
|
|
for (
|
|
// initialize result and counters
|
|
var bc = 0, bs, buffer, idx = 0, output = '';
|
|
// get next character
|
|
buffer = input.charAt(idx++);
|
|
// character found in table?
|
|
// initialize bit storage and add its ascii value
|
|
~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
|
|
// and if not first of each 4 characters,
|
|
// convert the first 8 bits to one ascii character
|
|
bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0
|
|
) {
|
|
// try to find character in table (0-63, not found => -1)
|
|
buffer = digits.indexOf(buffer);
|
|
}
|
|
return output;
|
|
};
|
|
})();
|
|
|
|
// Function.prototype.bind?
|
|
// Support: Android<4.0, iOS<6.0
|
|
(function checkFunctionPrototypeBindCompatibility() {
|
|
if (typeof Function.prototype.bind !== 'undefined') {
|
|
return;
|
|
}
|
|
|
|
Function.prototype.bind = function functionPrototypeBind(obj) {
|
|
var fn = this, headArgs = Array.prototype.slice.call(arguments, 1);
|
|
var bound = function functionPrototypeBindBound() {
|
|
var args = headArgs.concat(Array.prototype.slice.call(arguments));
|
|
return fn.apply(obj, args);
|
|
};
|
|
return bound;
|
|
};
|
|
})();
|
|
|
|
// HTMLElement dataset property
|
|
// Support: IE<11, Safari<5.1, Android<4.0
|
|
(function checkDatasetProperty() {
|
|
var div = document.createElement('div');
|
|
if ('dataset' in div) {
|
|
return; // dataset property exists
|
|
}
|
|
|
|
Object.defineProperty(HTMLElement.prototype, 'dataset', {
|
|
get: function() {
|
|
if (this._dataset) {
|
|
return this._dataset;
|
|
}
|
|
|
|
var dataset = {};
|
|
for (var j = 0, jj = this.attributes.length; j < jj; j++) {
|
|
var attribute = this.attributes[j];
|
|
if (attribute.name.substring(0, 5) !== 'data-') {
|
|
continue;
|
|
}
|
|
var key = attribute.name.substring(5).replace(/\-([a-z])/g,
|
|
function(all, ch) {
|
|
return ch.toUpperCase();
|
|
});
|
|
dataset[key] = attribute.value;
|
|
}
|
|
|
|
Object.defineProperty(this, '_dataset', {
|
|
value: dataset,
|
|
writable: false,
|
|
enumerable: false
|
|
});
|
|
return dataset;
|
|
},
|
|
enumerable: true
|
|
});
|
|
})();
|
|
|
|
// HTMLElement classList property
|
|
// Support: IE<10, Android<4.0, iOS<5.0
|
|
(function checkClassListProperty() {
|
|
var div = document.createElement('div');
|
|
if ('classList' in div) {
|
|
return; // classList property exists
|
|
}
|
|
|
|
function changeList(element, itemName, add, remove) {
|
|
var s = element.className || '';
|
|
var list = s.split(/\s+/g);
|
|
if (list[0] === '') {
|
|
list.shift();
|
|
}
|
|
var index = list.indexOf(itemName);
|
|
if (index < 0 && add) {
|
|
list.push(itemName);
|
|
}
|
|
if (index >= 0 && remove) {
|
|
list.splice(index, 1);
|
|
}
|
|
element.className = list.join(' ');
|
|
return (index >= 0);
|
|
}
|
|
|
|
var classListPrototype = {
|
|
add: function(name) {
|
|
changeList(this.element, name, true, false);
|
|
},
|
|
contains: function(name) {
|
|
return changeList(this.element, name, false, false);
|
|
},
|
|
remove: function(name) {
|
|
changeList(this.element, name, false, true);
|
|
},
|
|
toggle: function(name) {
|
|
changeList(this.element, name, true, true);
|
|
}
|
|
};
|
|
|
|
Object.defineProperty(HTMLElement.prototype, 'classList', {
|
|
get: function() {
|
|
if (this._classList) {
|
|
return this._classList;
|
|
}
|
|
|
|
var classList = Object.create(classListPrototype, {
|
|
element: {
|
|
value: this,
|
|
writable: false,
|
|
enumerable: true
|
|
}
|
|
});
|
|
Object.defineProperty(this, '_classList', {
|
|
value: classList,
|
|
writable: false,
|
|
enumerable: false
|
|
});
|
|
return classList;
|
|
},
|
|
enumerable: true
|
|
});
|
|
})();
|
|
|
|
// Check console compatibility
|
|
// In older IE versions the console object is not available
|
|
// unless console is open.
|
|
// Support: IE<10
|
|
(function checkConsoleCompatibility() {
|
|
if (!('console' in window)) {
|
|
window.console = {
|
|
log: function() {},
|
|
error: function() {},
|
|
warn: function() {}
|
|
};
|
|
} else if (!('bind' in console.log)) {
|
|
// native functions in IE9 might not have bind
|
|
console.log = (function(fn) {
|
|
return function(msg) { return fn(msg); };
|
|
})(console.log);
|
|
console.error = (function(fn) {
|
|
return function(msg) { return fn(msg); };
|
|
})(console.error);
|
|
console.warn = (function(fn) {
|
|
return function(msg) { return fn(msg); };
|
|
})(console.warn);
|
|
}
|
|
})();
|
|
|
|
// Check onclick compatibility in Opera
|
|
// Support: Opera<15
|
|
(function checkOnClickCompatibility() {
|
|
// workaround for reported Opera bug DSK-354448:
|
|
// onclick fires on disabled buttons with opaque content
|
|
function ignoreIfTargetDisabled(event) {
|
|
if (isDisabled(event.target)) {
|
|
event.stopPropagation();
|
|
}
|
|
}
|
|
function isDisabled(node) {
|
|
return node.disabled || (node.parentNode && isDisabled(node.parentNode));
|
|
}
|
|
if (navigator.userAgent.indexOf('Opera') !== -1) {
|
|
// use browser detection since we cannot feature-check this bug
|
|
document.addEventListener('click', ignoreIfTargetDisabled, true);
|
|
}
|
|
})();
|
|
|
|
// Checks if possible to use URL.createObjectURL()
|
|
// Support: IE
|
|
(function checkOnBlobSupport() {
|
|
// sometimes IE loosing the data created with createObjectURL(), see #3977
|
|
if (navigator.userAgent.indexOf('Trident') >= 0) {
|
|
PDFJS.disableCreateObjectURL = true;
|
|
}
|
|
})();
|
|
|
|
// Checks if navigator.language is supported
|
|
(function checkNavigatorLanguage() {
|
|
if ('language' in navigator) {
|
|
return;
|
|
}
|
|
PDFJS.locale = navigator.userLanguage || 'en-US';
|
|
})();
|
|
|
|
(function checkRangeRequests() {
|
|
// Safari has issues with cached range requests see:
|
|
// https://github.com/mozilla/pdf.js/issues/3260
|
|
// Last tested with version 6.0.4.
|
|
// Support: Safari 6.0+
|
|
var isSafari = Object.prototype.toString.call(
|
|
window.HTMLElement).indexOf('Constructor') > 0;
|
|
|
|
// Older versions of Android (pre 3.0) has issues with range requests, see:
|
|
// https://github.com/mozilla/pdf.js/issues/3381.
|
|
// Make sure that we only match webkit-based Android browsers,
|
|
// since Firefox/Fennec works as expected.
|
|
// Support: Android<3.0
|
|
var regex = /Android\s[0-2][^\d]/;
|
|
var isOldAndroid = regex.test(navigator.userAgent);
|
|
|
|
// Range requests are broken in Chrome 39 and 40, https://crbug.com/442318
|
|
var isChromeWithRangeBug = /Chrome\/(39|40)\./.test(navigator.userAgent);
|
|
|
|
if (isSafari || isOldAndroid || isChromeWithRangeBug) {
|
|
PDFJS.disableRange = true;
|
|
PDFJS.disableStream = true;
|
|
}
|
|
})();
|
|
|
|
// Check if the browser supports manipulation of the history.
|
|
// Support: IE<10, Android<4.2
|
|
(function checkHistoryManipulation() {
|
|
// Android 2.x has so buggy pushState support that it was removed in
|
|
// Android 3.0 and restored as late as in Android 4.2.
|
|
// Support: Android 2.x
|
|
if (!history.pushState || navigator.userAgent.indexOf('Android 2.') >= 0) {
|
|
PDFJS.disableHistory = true;
|
|
}
|
|
})();
|
|
|
|
// Support: IE<11, Chrome<21, Android<4.4, Safari<6
|
|
(function checkSetPresenceInImageData() {
|
|
// IE < 11 will use window.CanvasPixelArray which lacks set function.
|
|
if (window.CanvasPixelArray) {
|
|
if (typeof window.CanvasPixelArray.prototype.set !== 'function') {
|
|
window.CanvasPixelArray.prototype.set = function(arr) {
|
|
for (var i = 0, ii = this.length; i < ii; i++) {
|
|
this[i] = arr[i];
|
|
}
|
|
};
|
|
}
|
|
} else {
|
|
// Old Chrome and Android use an inaccessible CanvasPixelArray prototype.
|
|
// Because we cannot feature detect it, we rely on user agent parsing.
|
|
var polyfill = false, versionMatch;
|
|
if (navigator.userAgent.indexOf('Chrom') >= 0) {
|
|
versionMatch = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
|
|
// Chrome < 21 lacks the set function.
|
|
polyfill = versionMatch && parseInt(versionMatch[2]) < 21;
|
|
} else if (navigator.userAgent.indexOf('Android') >= 0) {
|
|
// Android < 4.4 lacks the set function.
|
|
// Android >= 4.4 will contain Chrome in the user agent,
|
|
// thus pass the Chrome check above and not reach this block.
|
|
polyfill = /Android\s[0-4][^\d]/g.test(navigator.userAgent);
|
|
} else if (navigator.userAgent.indexOf('Safari') >= 0) {
|
|
versionMatch = navigator.userAgent.
|
|
match(/Version\/([0-9]+)\.([0-9]+)\.([0-9]+) Safari\//);
|
|
// Safari < 6 lacks the set function.
|
|
polyfill = versionMatch && parseInt(versionMatch[1]) < 6;
|
|
}
|
|
|
|
if (polyfill) {
|
|
var contextPrototype = window.CanvasRenderingContext2D.prototype;
|
|
var createImageData = contextPrototype.createImageData;
|
|
contextPrototype.createImageData = function(w, h) {
|
|
var imageData = createImageData.call(this, w, h);
|
|
imageData.data.set = function(arr) {
|
|
for (var i = 0, ii = this.length; i < ii; i++) {
|
|
this[i] = arr[i];
|
|
}
|
|
};
|
|
return imageData;
|
|
};
|
|
// this closure will be kept referenced, so clear its vars
|
|
contextPrototype = null;
|
|
}
|
|
}
|
|
})();
|
|
|
|
// Support: IE<10, Android<4.0, iOS
|
|
(function checkRequestAnimationFrame() {
|
|
function fakeRequestAnimationFrame(callback) {
|
|
window.setTimeout(callback, 20);
|
|
}
|
|
|
|
var isIOS = /(iPad|iPhone|iPod)/g.test(navigator.userAgent);
|
|
if (isIOS) {
|
|
// requestAnimationFrame on iOS is broken, replacing with fake one.
|
|
window.requestAnimationFrame = fakeRequestAnimationFrame;
|
|
return;
|
|
}
|
|
if ('requestAnimationFrame' in window) {
|
|
return;
|
|
}
|
|
window.requestAnimationFrame =
|
|
window.mozRequestAnimationFrame ||
|
|
window.webkitRequestAnimationFrame ||
|
|
fakeRequestAnimationFrame;
|
|
})();
|
|
|
|
(function checkCanvasSizeLimitation() {
|
|
var isIOS = /(iPad|iPhone|iPod)/g.test(navigator.userAgent);
|
|
var isAndroid = /Android/g.test(navigator.userAgent);
|
|
if (isIOS || isAndroid) {
|
|
// 5MP
|
|
PDFJS.maxCanvasPixels = 5242880;
|
|
}
|
|
})();
|
|
|
|
// Disable fullscreen support for certain problematic configurations.
|
|
// Support: IE11+ (when embedded).
|
|
(function checkFullscreenSupport() {
|
|
var isEmbeddedIE = (navigator.userAgent.indexOf('Trident') >= 0 &&
|
|
window.parent !== window);
|
|
if (isEmbeddedIE) {
|
|
PDFJS.disableFullscreen = true;
|
|
}
|
|
})();
|
|
|
|
// Provides document.currentScript support
|
|
// Support: IE, Chrome<29.
|
|
(function checkCurrentScript() {
|
|
if ('currentScript' in document) {
|
|
return;
|
|
}
|
|
Object.defineProperty(document, 'currentScript', {
|
|
get: function () {
|
|
var scripts = document.getElementsByTagName('script');
|
|
return scripts[scripts.length - 1];
|
|
},
|
|
enumerable: true,
|
|
configurable: true
|
|
});
|
|
})();
|