/* 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.
*/

/* eslint strict: [“error”, “function”] */ /* eslint-disable no-extend-native */ /* globals VBArray, PDFJS */

(function compatibilityWrapper() {

'use strict';

var userAgent = navigator.userAgent;

var isAndroid = /Android/.test(userAgent); var isAndroidPre3 = /Androids[^d]/.test(userAgent); var isAndroidPre5 = /Androids[^d]/.test(userAgent); var isChrome = userAgent.indexOf('Chrom') >= 0; var isChromeWithRangeBug = /Chrome/(39|40)./.test(userAgent); var isIE = userAgent.indexOf('Trident') >= 0; var isIOS = /b(iPad|iPhone|iPod)(?=;)/.test(userAgent); var isOpera = userAgent.indexOf('Opera') >= 0; var isSafari = /Safari//.test(userAgent) &&

!/(Chrome\/|Android\s)/.test(userAgent);

// 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 (isOpera) {
  // 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 (isIE) {
  PDFJS.disableCreateObjectURL = true;
}

})();

// Checks if navigator.language is supported (function checkNavigatorLanguage() {

if ('language' in navigator) {
  return;
}
PDFJS.locale = navigator.userLanguage || 'en-US';

})();

// Support: Safari 6.0+, Android<3.0, Chrome 39/40, iOS (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.

// 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.

// Range requests are broken in Chrome 39 and 40, https://crbug.com/442318
if (isSafari || isAndroidPre3 || isChromeWithRangeBug || isIOS) {
  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 || isAndroidPre3) {
  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 (isChrome) {
    versionMatch = userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
    // Chrome < 21 lacks the set function.
    polyfill = versionMatch && parseInt(versionMatch[2]) < 21;
  } else if (isAndroid) {
    // 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 = isAndroidPre5;
  } else if (isSafari) {
    versionMatch = 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);
}

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;

})();

// Support: Android, iOS (function checkCanvasSizeLimitation() {

if (isIOS || isAndroid) {
  // 5MP
  PDFJS.maxCanvasPixels = 5242880;
}

})();

// Disable fullscreen support for certain problematic configurations. // Support: IE11+ (when embedded). (function checkFullscreenSupport() {

if (isIE && window.parent !== window) {
  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
});

})();

}).call((typeof window === 'undefined') ? this : window);