compatibility.js
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	/* -- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -- */
	/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
	/* 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
	(function checkTypedArrayCompatibility() {
	if (typeof Uint8Array !== 'undefined') {
	// some mobile versions do not support subarray (e.g. safari 5 / iOS)
	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));
	};
	}

	// some mobile version might not support Float64Array
	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;
	if (typeof arg1 === 'number') {
	result = [];
	for (var i = 0; i < arg1; ++i)
	result[i] = 0;
	} else if ('slice' in arg1) {
	result = arg1.slice(0);
	} else {
	result = [];
	for (var 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;

	// 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
	(function normalizeURLObject() {
	if (!window.URL) {
	window.URL = window.webkitURL;
	}
	})();

	// Object.create() ?
	(function checkObjectCreateCompatibility() {
	if (typeof Object.create !== 'undefined')
	return;

	Object.create = function objectCreate(proto) {
	function Constructor() {}
	Constructor.prototype = proto;
	return new Constructor();
	};
	})();

	// Object.defineProperty() ?
	(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;
	}
	};
	})();

	// Object.keys() ?
	(function checkObjectKeysCompatibility() {
	if (typeof Object.keys !== 'undefined')
	return;

	Object.keys = function objectKeys(obj) {
	var result = [];
	for (var i in obj) {
	if (obj.hasOwnProperty(i))
	result.push(i);
	}
	return result;
	};
	})();

	// No readAsArrayBuffer ?
	(function checkFileReaderReadAsArrayBuffer() {
	if (typeof FileReader === 'undefined')
	return; // FileReader is not implemented
	var frPrototype = FileReader.prototype;
	// Older versions of Firefox might not have readAsArrayBuffer
	if ('readAsArrayBuffer' in frPrototype)
	return; // readAsArrayBuffer is implemented
	Object.defineProperty(frPrototype, 'readAsArrayBuffer', {
	value: function fileReaderReadAsArrayBuffer(blob) {
	var fileReader = new FileReader();
	var originalReader = this;
	fileReader.onload = function fileReaderOnload(evt) {
	var data = evt.target.result;
	var buffer = new ArrayBuffer(data.length);
	var uint8Array = new Uint8Array(buffer);

	for (var i = 0, ii = data.length; i < ii; i++)
	uint8Array[i] = data.charCodeAt(i);

	Object.defineProperty(originalReader, 'result', {
	value: buffer,
	enumerable: true,
	writable: false,
	configurable: true
	});

	var event = document.createEvent('HTMLEvents');
	event.initEvent('load', false, false);
	originalReader.dispatchEvent(event);
	};
	fileReader.readAsBinaryString(blob);
	}
	});
	})();

	// No XMLHttpRequest.response ?
	(function checkXMLHttpRequestResponseCompatibility() {
	var xhrPrototype = XMLHttpRequest.prototype;
	if (!('overrideMimeType' in xhrPrototype)) {
	// IE10 might have response, but not overrideMimeType
	Object.defineProperty(xhrPrototype, 'overrideMimeType', {
	value: function xmlHttpRequestOverrideMimeType(mimeType) {}
	});
	}
	if ('response' in xhrPrototype \|\|
	'mozResponseArrayBuffer' in xhrPrototype \|\|
	'mozResponse' in xhrPrototype \|\|
	'responseArrayBuffer' in xhrPrototype)
	return;
	// IE9 ?
	if (typeof VBArray !== 'undefined') {
	Object.defineProperty(xhrPrototype, 'response', {
	get: function xmlHttpRequestResponseGet() {
	return new Uint8Array(new VBArray(this.responseBody).toArray());
	}
	});
	return;
	}

	// other browsers
	function responseTypeSetter() {
	// will be only called to set "arraybuffer"
	this.overrideMimeType('text/plain; charset=x-user-defined');
	}
	if (typeof xhrPrototype.overrideMimeType === 'function') {
	Object.defineProperty(xhrPrototype, 'responseType',
	{ set: responseTypeSetter });
	}
	function responseGetter() {
	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;
	}
	Object.defineProperty(xhrPrototype, 'response', { get: responseGetter });
	})();

	// window.btoa (base64 encode function) ?
	(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) ?
	(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 ?
	(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 = Array.prototype.concat.apply(headArgs, arguments);
	return fn.apply(obj, args);
	};
	return bound;
	};
	})();

	// HTMLElement dataset property
	(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
	(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
	(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
	(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()
	(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;
	Object.defineProperty(navigator, 'language', {
	get: function navigatorLanguage() {
	var language = navigator.userLanguage \|\| 'en-US';
	return language.substring(0, 2).toLowerCase() +
	language.substring(2).toUpperCase();
	},
	enumerable: true
	});
	})();

	(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.
	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.
	var regex = /Android\s[0-2][^\d]/;
	var isOldAndroid = regex.test(navigator.userAgent);

	if (isSafari \|\| isOldAndroid) {
	PDFJS.disableRange = true;
	}
	})();

	// Check if the browser supports manipulation of the history.
	(function checkHistoryManipulation() {
	if (!window.history.pushState) {
	PDFJS.disableHistory = true;
	}
	})();

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