563 lines
17 KiB
JavaScript
563 lines
17 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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// 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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// 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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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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}
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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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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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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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}
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return result
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}
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window.Uint8Array = TypedArray
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window.Int8Array = 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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// 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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// 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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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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// 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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// 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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// 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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// 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 xhr.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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}
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return result.buffer
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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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// 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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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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// 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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}
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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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// 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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}
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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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// HTMLElement dataset property
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// Support: IE<11, Safari<5.1, Android<4.0
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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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}
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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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}
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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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}
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var key = attribute.name.substring(5).replace(/\-([a-z])/g,
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function (all, ch) {
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return ch.toUpperCase()
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})
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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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// Support: IE<10, Android<4.0, iOS<5.0
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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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}
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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] === '') {
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list.shift()
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}
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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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}
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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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}
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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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}
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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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// In older IE versions the console object is not available
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// unless console is open.
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// Support: IE<10
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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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// Support: Opera<15
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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 possible to use URL.createObjectURL()
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// Support: IE
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(function checkOnBlobSupport () {
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// sometimes IE loosing the data created with createObjectURL(), see #3977
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if (navigator.userAgent.indexOf('Trident') >= 0) {
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PDFJS.disableCreateObjectURL = 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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/^[a-z]+(-[A-Z]+)?$/.test(navigator.language)) {
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return
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}
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function formatLocale (locale) {
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var split = locale.split(/[-_]/)
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split[0] = split[0].toLowerCase()
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if (split.length > 1) {
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split[1] = split[1].toUpperCase()
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}
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return split.join('-')
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}
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var language = navigator.language || navigator.userLanguage || 'en-US'
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PDFJS.locale = formatLocale(language)
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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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// Support: Safari 6.0+
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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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// Support: Android<3.0
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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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// Support: IE<10, Android<4.2
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(function checkHistoryManipulation () {
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// Android 2.x has so buggy pushState support that it was removed in
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// Android 3.0 and restored as late as in Android 4.2.
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// Support: Android 2.x
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if (!history.pushState || navigator.userAgent.indexOf('Android 2.') >= 0) {
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PDFJS.disableHistory = true
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}
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})();
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// Support: IE<11, Chrome<21, Android<4.4, Safari<6
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(function checkSetPresenceInImageData () {
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// IE < 11 will use window.CanvasPixelArray which lacks set function.
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if (window.CanvasPixelArray) {
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if (typeof window.CanvasPixelArray.prototype.set !== 'function') {
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window.CanvasPixelArray.prototype.set = function (arr) {
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for (var i = 0, ii = this.length; i < ii; i++) {
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this[i] = arr[i]
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}
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}
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}
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} else {
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// Old Chrome and Android use an inaccessible CanvasPixelArray prototype.
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// Because we cannot feature detect it, we rely on user agent parsing.
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var polyfill = false, versionMatch
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if (navigator.userAgent.indexOf('Chrom') >= 0) {
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versionMatch = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./)
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// Chrome < 21 lacks the set function.
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polyfill = versionMatch && parseInt(versionMatch[2]) < 21
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} else if (navigator.userAgent.indexOf('Android') >= 0) {
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// Android < 4.4 lacks the set function.
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// Android >= 4.4 will contain Chrome in the user agent,
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// thus pass the Chrome check above and not reach this block.
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polyfill = /Android\s[0-4][^\d]/g.test(navigator.userAgent)
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} else if (navigator.userAgent.indexOf('Safari') >= 0) {
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versionMatch = navigator.userAgent
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.match(/Version\/([0-9]+)\.([0-9]+)\.([0-9]+) Safari\//)
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// Safari < 6 lacks the set function.
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polyfill = versionMatch && parseInt(versionMatch[1]) < 6
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}
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if (polyfill) {
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var contextPrototype = window.CanvasRenderingContext2D.prototype
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contextPrototype._createImageData = contextPrototype.createImageData
|
|
contextPrototype.createImageData = function (w, h) {
|
|
var imageData = this._createImageData(w, h)
|
|
imageData.data.set = function (arr) {
|
|
for (var i = 0, ii = this.length; i < ii; i++) {
|
|
this[i] = arr[i]
|
|
}
|
|
}
|
|
return imageData
|
|
}
|
|
}
|
|
}
|
|
})();
|
|
|
|
// 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
|
|
}
|
|
})()
|