pdfjs-dist/lib/shared/util.js

/* Copyright 2017 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.
 */
'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.unreachable = exports.warn = exports.utf8StringToString = exports.stringToUTF8String = exports.stringToPDFString = exports.stringToBytes = exports.string32 = exports.shadow = exports.setVerbosityLevel = exports.ReadableStream = exports.removeNullCharacters = exports.readUint32 = exports.readUint16 = exports.readInt8 = exports.log2 = exports.loadJpegStream = exports.isEvalSupported = exports.isLittleEndian = exports.createValidAbsoluteUrl = exports.isSameOrigin = exports.isNodeJS = exports.isSpace = exports.isString = exports.isNum = exports.isInt = exports.isEmptyObj = exports.isBool = exports.isArrayBuffer = exports.isArray = exports.info = exports.globalScope = exports.getVerbosityLevel = exports.getLookupTableFactory = exports.deprecated = exports.createObjectURL = exports.createPromiseCapability = exports.createBlob = exports.bytesToString = exports.assert = exports.arraysToBytes = exports.arrayByteLength = exports.FormatError = exports.XRefParseException = exports.Util = exports.UnknownErrorException = exports.UnexpectedResponseException = exports.TextRenderingMode = exports.StreamType = exports.StatTimer = exports.PasswordResponses = exports.PasswordException = exports.PageViewport = exports.NotImplementedException = exports.NativeImageDecoding = exports.MissingPDFException = exports.MissingDataException = exports.MessageHandler = exports.InvalidPDFException = exports.CMapCompressionType = exports.ImageKind = exports.FontType = exports.AnnotationType = exports.AnnotationFlag = exports.AnnotationFieldFlag = exports.AnnotationBorderStyleType = exports.UNSUPPORTED_FEATURES = exports.VERBOSITY_LEVELS = exports.OPS = exports.IDENTITY_MATRIX = exports.FONT_IDENTITY_MATRIX = undefined;

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

require('./compatibility');

var _streamsLib = require('../../external/streams/streams-lib');

var globalScope = typeof window !== 'undefined' && window.Math === Math ? window : typeof global !== 'undefined' && global.Math === Math ? global : typeof self !== 'undefined' && self.Math === Math ? self : undefined;
var FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];
var NativeImageDecoding = {
  NONE: 'none',
  DECODE: 'decode',
  DISPLAY: 'display'
};
var TextRenderingMode = {
  FILL: 0,
  STROKE: 1,
  FILL_STROKE: 2,
  INVISIBLE: 3,
  FILL_ADD_TO_PATH: 4,
  STROKE_ADD_TO_PATH: 5,
  FILL_STROKE_ADD_TO_PATH: 6,
  ADD_TO_PATH: 7,
  FILL_STROKE_MASK: 3,
  ADD_TO_PATH_FLAG: 4
};
var ImageKind = {
  GRAYSCALE_1BPP: 1,
  RGB_24BPP: 2,
  RGBA_32BPP: 3
};
var AnnotationType = {
  TEXT: 1,
  LINK: 2,
  FREETEXT: 3,
  LINE: 4,
  SQUARE: 5,
  CIRCLE: 6,
  POLYGON: 7,
  POLYLINE: 8,
  HIGHLIGHT: 9,
  UNDERLINE: 10,
  SQUIGGLY: 11,
  STRIKEOUT: 12,
  STAMP: 13,
  CARET: 14,
  INK: 15,
  POPUP: 16,
  FILEATTACHMENT: 17,
  SOUND: 18,
  MOVIE: 19,
  WIDGET: 20,
  SCREEN: 21,
  PRINTERMARK: 22,
  TRAPNET: 23,
  WATERMARK: 24,
  THREED: 25,
  REDACT: 26
};
var AnnotationFlag = {
  INVISIBLE: 0x01,
  HIDDEN: 0x02,
  PRINT: 0x04,
  NOZOOM: 0x08,
  NOROTATE: 0x10,
  NOVIEW: 0x20,
  READONLY: 0x40,
  LOCKED: 0x80,
  TOGGLENOVIEW: 0x100,
  LOCKEDCONTENTS: 0x200
};
var AnnotationFieldFlag = {
  READONLY: 0x0000001,
  REQUIRED: 0x0000002,
  NOEXPORT: 0x0000004,
  MULTILINE: 0x0001000,
  PASSWORD: 0x0002000,
  NOTOGGLETOOFF: 0x0004000,
  RADIO: 0x0008000,
  PUSHBUTTON: 0x0010000,
  COMBO: 0x0020000,
  EDIT: 0x0040000,
  SORT: 0x0080000,
  FILESELECT: 0x0100000,
  MULTISELECT: 0x0200000,
  DONOTSPELLCHECK: 0x0400000,
  DONOTSCROLL: 0x0800000,
  COMB: 0x1000000,
  RICHTEXT: 0x2000000,
  RADIOSINUNISON: 0x2000000,
  COMMITONSELCHANGE: 0x4000000
};
var AnnotationBorderStyleType = {
  SOLID: 1,
  DASHED: 2,
  BEVELED: 3,
  INSET: 4,
  UNDERLINE: 5
};
var StreamType = {
  UNKNOWN: 0,
  FLATE: 1,
  LZW: 2,
  DCT: 3,
  JPX: 4,
  JBIG: 5,
  A85: 6,
  AHX: 7,
  CCF: 8,
  RL: 9
};
var FontType = {
  UNKNOWN: 0,
  TYPE1: 1,
  TYPE1C: 2,
  CIDFONTTYPE0: 3,
  CIDFONTTYPE0C: 4,
  TRUETYPE: 5,
  CIDFONTTYPE2: 6,
  TYPE3: 7,
  OPENTYPE: 8,
  TYPE0: 9,
  MMTYPE1: 10
};
var VERBOSITY_LEVELS = {
  errors: 0,
  warnings: 1,
  infos: 5
};
var CMapCompressionType = {
  NONE: 0,
  BINARY: 1,
  STREAM: 2
};
var OPS = {
  dependency: 1,
  setLineWidth: 2,
  setLineCap: 3,
  setLineJoin: 4,
  setMiterLimit: 5,
  setDash: 6,
  setRenderingIntent: 7,
  setFlatness: 8,
  setGState: 9,
  save: 10,
  restore: 11,
  transform: 12,
  moveTo: 13,
  lineTo: 14,
  curveTo: 15,
  curveTo2: 16,
  curveTo3: 17,
  closePath: 18,
  rectangle: 19,
  stroke: 20,
  closeStroke: 21,
  fill: 22,
  eoFill: 23,
  fillStroke: 24,
  eoFillStroke: 25,
  closeFillStroke: 26,
  closeEOFillStroke: 27,
  endPath: 28,
  clip: 29,
  eoClip: 30,
  beginText: 31,
  endText: 32,
  setCharSpacing: 33,
  setWordSpacing: 34,
  setHScale: 35,
  setLeading: 36,
  setFont: 37,
  setTextRenderingMode: 38,
  setTextRise: 39,
  moveText: 40,
  setLeadingMoveText: 41,
  setTextMatrix: 42,
  nextLine: 43,
  showText: 44,
  showSpacedText: 45,
  nextLineShowText: 46,
  nextLineSetSpacingShowText: 47,
  setCharWidth: 48,
  setCharWidthAndBounds: 49,
  setStrokeColorSpace: 50,
  setFillColorSpace: 51,
  setStrokeColor: 52,
  setStrokeColorN: 53,
  setFillColor: 54,
  setFillColorN: 55,
  setStrokeGray: 56,
  setFillGray: 57,
  setStrokeRGBColor: 58,
  setFillRGBColor: 59,
  setStrokeCMYKColor: 60,
  setFillCMYKColor: 61,
  shadingFill: 62,
  beginInlineImage: 63,
  beginImageData: 64,
  endInlineImage: 65,
  paintXObject: 66,
  markPoint: 67,
  markPointProps: 68,
  beginMarkedContent: 69,
  beginMarkedContentProps: 70,
  endMarkedContent: 71,
  beginCompat: 72,
  endCompat: 73,
  paintFormXObjectBegin: 74,
  paintFormXObjectEnd: 75,
  beginGroup: 76,
  endGroup: 77,
  beginAnnotations: 78,
  endAnnotations: 79,
  beginAnnotation: 80,
  endAnnotation: 81,
  paintJpegXObject: 82,
  paintImageMaskXObject: 83,
  paintImageMaskXObjectGroup: 84,
  paintImageXObject: 85,
  paintInlineImageXObject: 86,
  paintInlineImageXObjectGroup: 87,
  paintImageXObjectRepeat: 88,
  paintImageMaskXObjectRepeat: 89,
  paintSolidColorImageMask: 90,
  constructPath: 91
};
var verbosity = VERBOSITY_LEVELS.warnings;
function setVerbosityLevel(level) {
  verbosity = level;
}
function getVerbosityLevel() {
  return verbosity;
}
function info(msg) {
  if (verbosity >= VERBOSITY_LEVELS.infos) {
    console.log('Info: ' + msg);
  }
}
function warn(msg) {
  if (verbosity >= VERBOSITY_LEVELS.warnings) {
    console.log('Warning: ' + msg);
  }
}
function deprecated(details) {
  console.log('Deprecated API usage: ' + details);
}
function unreachable(msg) {
  throw new Error(msg);
}
function assert(cond, msg) {
  if (!cond) {
    unreachable(msg);
  }
}
var UNSUPPORTED_FEATURES = {
  unknown: 'unknown',
  forms: 'forms',
  javaScript: 'javaScript',
  smask: 'smask',
  shadingPattern: 'shadingPattern',
  font: 'font'
};
function isSameOrigin(baseUrl, otherUrl) {
  try {
    var base = new URL(baseUrl);
    if (!base.origin || base.origin === 'null') {
      return false;
    }
  } catch (e) {
    return false;
  }
  var other = new URL(otherUrl, base);
  return base.origin === other.origin;
}
function isValidProtocol(url) {
  if (!url) {
    return false;
  }
  switch (url.protocol) {
    case 'http:':
    case 'https:':
    case 'ftp:':
    case 'mailto:':
    case 'tel:':
      return true;
    default:
      return false;
  }
}
function createValidAbsoluteUrl(url, baseUrl) {
  if (!url) {
    return null;
  }
  try {
    var absoluteUrl = baseUrl ? new URL(url, baseUrl) : new URL(url);
    if (isValidProtocol(absoluteUrl)) {
      return absoluteUrl;
    }
  } catch (ex) {}
  return null;
}
function shadow(obj, prop, value) {
  Object.defineProperty(obj, prop, {
    value: value,
    enumerable: true,
    configurable: true,
    writable: false
  });
  return value;
}
function getLookupTableFactory(initializer) {
  var lookup;
  return function () {
    if (initializer) {
      lookup = Object.create(null);
      initializer(lookup);
      initializer = null;
    }
    return lookup;
  };
}
var PasswordResponses = {
  NEED_PASSWORD: 1,
  INCORRECT_PASSWORD: 2
};
var PasswordException = function PasswordExceptionClosure() {
  function PasswordException(msg, code) {
    this.name = 'PasswordException';
    this.message = msg;
    this.code = code;
  }
  PasswordException.prototype = new Error();
  PasswordException.constructor = PasswordException;
  return PasswordException;
}();
var UnknownErrorException = function UnknownErrorExceptionClosure() {
  function UnknownErrorException(msg, details) {
    this.name = 'UnknownErrorException';
    this.message = msg;
    this.details = details;
  }
  UnknownErrorException.prototype = new Error();
  UnknownErrorException.constructor = UnknownErrorException;
  return UnknownErrorException;
}();
var InvalidPDFException = function InvalidPDFExceptionClosure() {
  function InvalidPDFException(msg) {
    this.name = 'InvalidPDFException';
    this.message = msg;
  }
  InvalidPDFException.prototype = new Error();
  InvalidPDFException.constructor = InvalidPDFException;
  return InvalidPDFException;
}();
var MissingPDFException = function MissingPDFExceptionClosure() {
  function MissingPDFException(msg) {
    this.name = 'MissingPDFException';
    this.message = msg;
  }
  MissingPDFException.prototype = new Error();
  MissingPDFException.constructor = MissingPDFException;
  return MissingPDFException;
}();
var UnexpectedResponseException = function UnexpectedResponseExceptionClosure() {
  function UnexpectedResponseException(msg, status) {
    this.name = 'UnexpectedResponseException';
    this.message = msg;
    this.status = status;
  }
  UnexpectedResponseException.prototype = new Error();
  UnexpectedResponseException.constructor = UnexpectedResponseException;
  return UnexpectedResponseException;
}();
var NotImplementedException = function NotImplementedExceptionClosure() {
  function NotImplementedException(msg) {
    this.message = msg;
  }
  NotImplementedException.prototype = new Error();
  NotImplementedException.prototype.name = 'NotImplementedException';
  NotImplementedException.constructor = NotImplementedException;
  return NotImplementedException;
}();
var MissingDataException = function MissingDataExceptionClosure() {
  function MissingDataException(begin, end) {
    this.begin = begin;
    this.end = end;
    this.message = 'Missing data [' + begin + ', ' + end + ')';
  }
  MissingDataException.prototype = new Error();
  MissingDataException.prototype.name = 'MissingDataException';
  MissingDataException.constructor = MissingDataException;
  return MissingDataException;
}();
var XRefParseException = function XRefParseExceptionClosure() {
  function XRefParseException(msg) {
    this.message = msg;
  }
  XRefParseException.prototype = new Error();
  XRefParseException.prototype.name = 'XRefParseException';
  XRefParseException.constructor = XRefParseException;
  return XRefParseException;
}();
var FormatError = function FormatErrorClosure() {
  function FormatError(msg) {
    this.message = msg;
  }
  FormatError.prototype = new Error();
  FormatError.prototype.name = 'FormatError';
  FormatError.constructor = FormatError;
  return FormatError;
}();
var NullCharactersRegExp = /\x00/g;
function removeNullCharacters(str) {
  if (typeof str !== 'string') {
    warn('The argument for removeNullCharacters must be a string.');
    return str;
  }
  return str.replace(NullCharactersRegExp, '');
}
function bytesToString(bytes) {
  assert(bytes !== null && (typeof bytes === 'undefined' ? 'undefined' : _typeof(bytes)) === 'object' && bytes.length !== undefined, 'Invalid argument for bytesToString');
  var length = bytes.length;
  var MAX_ARGUMENT_COUNT = 8192;
  if (length < MAX_ARGUMENT_COUNT) {
    return String.fromCharCode.apply(null, bytes);
  }
  var strBuf = [];
  for (var i = 0; i < length; i += MAX_ARGUMENT_COUNT) {
    var chunkEnd = Math.min(i + MAX_ARGUMENT_COUNT, length);
    var chunk = bytes.subarray(i, chunkEnd);
    strBuf.push(String.fromCharCode.apply(null, chunk));
  }
  return strBuf.join('');
}
function stringToBytes(str) {
  assert(typeof str === 'string', 'Invalid argument for stringToBytes');
  var length = str.length;
  var bytes = new Uint8Array(length);
  for (var i = 0; i < length; ++i) {
    bytes[i] = str.charCodeAt(i) & 0xFF;
  }
  return bytes;
}
function arrayByteLength(arr) {
  if (arr.length !== undefined) {
    return arr.length;
  }
  assert(arr.byteLength !== undefined);
  return arr.byteLength;
}
function arraysToBytes(arr) {
  if (arr.length === 1 && arr[0] instanceof Uint8Array) {
    return arr[0];
  }
  var resultLength = 0;
  var i,
      ii = arr.length;
  var item, itemLength;
  for (i = 0; i < ii; i++) {
    item = arr[i];
    itemLength = arrayByteLength(item);
    resultLength += itemLength;
  }
  var pos = 0;
  var data = new Uint8Array(resultLength);
  for (i = 0; i < ii; i++) {
    item = arr[i];
    if (!(item instanceof Uint8Array)) {
      if (typeof item === 'string') {
        item = stringToBytes(item);
      } else {
        item = new Uint8Array(item);
      }
    }
    itemLength = item.byteLength;
    data.set(item, pos);
    pos += itemLength;
  }
  return data;
}
function string32(value) {
  return String.fromCharCode(value >> 24 & 0xff, value >> 16 & 0xff, value >> 8 & 0xff, value & 0xff);
}
function log2(x) {
  var n = 1,
      i = 0;
  while (x > n) {
    n <<= 1;
    i++;
  }
  return i;
}
function readInt8(data, start) {
  return data[start] << 24 >> 24;
}
function readUint16(data, offset) {
  return data[offset] << 8 | data[offset + 1];
}
function readUint32(data, offset) {
  return (data[offset] << 24 | data[offset + 1] << 16 | data[offset + 2] << 8 | data[offset + 3]) >>> 0;
}
function isLittleEndian() {
  var buffer8 = new Uint8Array(4);
  buffer8[0] = 1;
  var view32 = new Uint32Array(buffer8.buffer, 0, 1);
  return view32[0] === 1;
}
function isEvalSupported() {
  try {
    new Function('');
    return true;
  } catch (e) {
    return false;
  }
}
var IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];
var Util = function UtilClosure() {
  function Util() {}
  var rgbBuf = ['rgb(', 0, ',', 0, ',', 0, ')'];
  Util.makeCssRgb = function Util_makeCssRgb(r, g, b) {
    rgbBuf[1] = r;
    rgbBuf[3] = g;
    rgbBuf[5] = b;
    return rgbBuf.join('');
  };
  Util.transform = function Util_transform(m1, m2) {
    return [m1[0] * m2[0] + m1[2] * m2[1], m1[1] * m2[0] + m1[3] * m2[1], m1[0] * m2[2] + m1[2] * m2[3], m1[1] * m2[2] + m1[3] * m2[3], m1[0] * m2[4] + m1[2] * m2[5] + m1[4], m1[1] * m2[4] + m1[3] * m2[5] + m1[5]];
  };
  Util.applyTransform = function Util_applyTransform(p, m) {
    var xt = p[0] * m[0] + p[1] * m[2] + m[4];
    var yt = p[0] * m[1] + p[1] * m[3] + m[5];
    return [xt, yt];
  };
  Util.applyInverseTransform = function Util_applyInverseTransform(p, m) {
    var d = m[0] * m[3] - m[1] * m[2];
    var xt = (p[0] * m[3] - p[1] * m[2] + m[2] * m[5] - m[4] * m[3]) / d;
    var yt = (-p[0] * m[1] + p[1] * m[0] + m[4] * m[1] - m[5] * m[0]) / d;
    return [xt, yt];
  };
  Util.getAxialAlignedBoundingBox = function Util_getAxialAlignedBoundingBox(r, m) {
    var p1 = Util.applyTransform(r, m);
    var p2 = Util.applyTransform(r.slice(2, 4), m);
    var p3 = Util.applyTransform([r[0], r[3]], m);
    var p4 = Util.applyTransform([r[2], r[1]], m);
    return [Math.min(p1[0], p2[0], p3[0], p4[0]), Math.min(p1[1], p2[1], p3[1], p4[1]), Math.max(p1[0], p2[0], p3[0], p4[0]), Math.max(p1[1], p2[1], p3[1], p4[1])];
  };
  Util.inverseTransform = function Util_inverseTransform(m) {
    var d = m[0] * m[3] - m[1] * m[2];
    return [m[3] / d, -m[1] / d, -m[2] / d, m[0] / d, (m[2] * m[5] - m[4] * m[3]) / d, (m[4] * m[1] - m[5] * m[0]) / d];
  };
  Util.apply3dTransform = function Util_apply3dTransform(m, v) {
    return [m[0] * v[0] + m[1] * v[1] + m[2] * v[2], m[3] * v[0] + m[4] * v[1] + m[5] * v[2], m[6] * v[0] + m[7] * v[1] + m[8] * v[2]];
  };
  Util.singularValueDecompose2dScale = function Util_singularValueDecompose2dScale(m) {
    var transpose = [m[0], m[2], m[1], m[3]];
    var a = m[0] * transpose[0] + m[1] * transpose[2];
    var b = m[0] * transpose[1] + m[1] * transpose[3];
    var c = m[2] * transpose[0] + m[3] * transpose[2];
    var d = m[2] * transpose[1] + m[3] * transpose[3];
    var first = (a + d) / 2;
    var second = Math.sqrt((a + d) * (a + d) - 4 * (a * d - c * b)) / 2;
    var sx = first + second || 1;
    var sy = first - second || 1;
    return [Math.sqrt(sx), Math.sqrt(sy)];
  };
  Util.normalizeRect = function Util_normalizeRect(rect) {
    var r = rect.slice(0);
    if (rect[0] > rect[2]) {
      r[0] = rect[2];
      r[2] = rect[0];
    }
    if (rect[1] > rect[3]) {
      r[1] = rect[3];
      r[3] = rect[1];
    }
    return r;
  };
  Util.intersect = function Util_intersect(rect1, rect2) {
    function compare(a, b) {
      return a - b;
    }
    var orderedX = [rect1[0], rect1[2], rect2[0], rect2[2]].sort(compare),
        orderedY = [rect1[1], rect1[3], rect2[1], rect2[3]].sort(compare),
        result = [];
    rect1 = Util.normalizeRect(rect1);
    rect2 = Util.normalizeRect(rect2);
    if (orderedX[0] === rect1[0] && orderedX[1] === rect2[0] || orderedX[0] === rect2[0] && orderedX[1] === rect1[0]) {
      result[0] = orderedX[1];
      result[2] = orderedX[2];
    } else {
      return false;
    }
    if (orderedY[0] === rect1[1] && orderedY[1] === rect2[1] || orderedY[0] === rect2[1] && orderedY[1] === rect1[1]) {
      result[1] = orderedY[1];
      result[3] = orderedY[2];
    } else {
      return false;
    }
    return result;
  };
  Util.sign = function Util_sign(num) {
    return num < 0 ? -1 : 1;
  };
  var ROMAN_NUMBER_MAP = ['', 'C', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC', 'DCCC', 'CM', '', 'X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC', '', 'I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'];
  Util.toRoman = function Util_toRoman(number, lowerCase) {
    assert(isInt(number) && number > 0, 'The number should be a positive integer.');
    var pos,
        romanBuf = [];
    while (number >= 1000) {
      number -= 1000;
      romanBuf.push('M');
    }
    pos = number / 100 | 0;
    number %= 100;
    romanBuf.push(ROMAN_NUMBER_MAP[pos]);
    pos = number / 10 | 0;
    number %= 10;
    romanBuf.push(ROMAN_NUMBER_MAP[10 + pos]);
    romanBuf.push(ROMAN_NUMBER_MAP[20 + number]);
    var romanStr = romanBuf.join('');
    return lowerCase ? romanStr.toLowerCase() : romanStr;
  };
  Util.appendToArray = function Util_appendToArray(arr1, arr2) {
    Array.prototype.push.apply(arr1, arr2);
  };
  Util.prependToArray = function Util_prependToArray(arr1, arr2) {
    Array.prototype.unshift.apply(arr1, arr2);
  };
  Util.extendObj = function extendObj(obj1, obj2) {
    for (var key in obj2) {
      obj1[key] = obj2[key];
    }
  };
  Util.getInheritableProperty = function Util_getInheritableProperty(dict, name, getArray) {
    while (dict && !dict.has(name)) {
      dict = dict.get('Parent');
    }
    if (!dict) {
      return null;
    }
    return getArray ? dict.getArray(name) : dict.get(name);
  };
  Util.inherit = function Util_inherit(sub, base, prototype) {
    sub.prototype = Object.create(base.prototype);
    sub.prototype.constructor = sub;
    for (var prop in prototype) {
      sub.prototype[prop] = prototype[prop];
    }
  };
  Util.loadScript = function Util_loadScript(src, callback) {
    var script = document.createElement('script');
    var loaded = false;
    script.setAttribute('src', src);
    if (callback) {
      script.onload = function () {
        if (!loaded) {
          callback();
        }
        loaded = true;
      };
    }
    document.getElementsByTagName('head')[0].appendChild(script);
  };
  return Util;
}();
var PageViewport = function PageViewportClosure() {
  function PageViewport(viewBox, scale, rotation, offsetX, offsetY, dontFlip) {
    this.viewBox = viewBox;
    this.scale = scale;
    this.rotation = rotation;
    this.offsetX = offsetX;
    this.offsetY = offsetY;
    var centerX = (viewBox[2] + viewBox[0]) / 2;
    var centerY = (viewBox[3] + viewBox[1]) / 2;
    var rotateA, rotateB, rotateC, rotateD;
    rotation = rotation % 360;
    rotation = rotation < 0 ? rotation + 360 : rotation;
    switch (rotation) {
      case 180:
        rotateA = -1;
        rotateB = 0;
        rotateC = 0;
        rotateD = 1;
        break;
      case 90:
        rotateA = 0;
        rotateB = 1;
        rotateC = 1;
        rotateD = 0;
        break;
      case 270:
        rotateA = 0;
        rotateB = -1;
        rotateC = -1;
        rotateD = 0;
        break;
      default:
        rotateA = 1;
        rotateB = 0;
        rotateC = 0;
        rotateD = -1;
        break;
    }
    if (dontFlip) {
      rotateC = -rotateC;
      rotateD = -rotateD;
    }
    var offsetCanvasX, offsetCanvasY;
    var width, height;
    if (rotateA === 0) {
      offsetCanvasX = Math.abs(centerY - viewBox[1]) * scale + offsetX;
      offsetCanvasY = Math.abs(centerX - viewBox[0]) * scale + offsetY;
      width = Math.abs(viewBox[3] - viewBox[1]) * scale;
      height = Math.abs(viewBox[2] - viewBox[0]) * scale;
    } else {
      offsetCanvasX = Math.abs(centerX - viewBox[0]) * scale + offsetX;
      offsetCanvasY = Math.abs(centerY - viewBox[1]) * scale + offsetY;
      width = Math.abs(viewBox[2] - viewBox[0]) * scale;
      height = Math.abs(viewBox[3] - viewBox[1]) * scale;
    }
    this.transform = [rotateA * scale, rotateB * scale, rotateC * scale, rotateD * scale, offsetCanvasX - rotateA * scale * centerX - rotateC * scale * centerY, offsetCanvasY - rotateB * scale * centerX - rotateD * scale * centerY];
    this.width = width;
    this.height = height;
    this.fontScale = scale;
  }
  PageViewport.prototype = {
    clone: function PageViewPort_clone(args) {
      args = args || {};
      var scale = 'scale' in args ? args.scale : this.scale;
      var rotation = 'rotation' in args ? args.rotation : this.rotation;
      return new PageViewport(this.viewBox.slice(), scale, rotation, this.offsetX, this.offsetY, args.dontFlip);
    },
    convertToViewportPoint: function PageViewport_convertToViewportPoint(x, y) {
      return Util.applyTransform([x, y], this.transform);
    },
    convertToViewportRectangle: function PageViewport_convertToViewportRectangle(rect) {
      var tl = Util.applyTransform([rect[0], rect[1]], this.transform);
      var br = Util.applyTransform([rect[2], rect[3]], this.transform);
      return [tl[0], tl[1], br[0], br[1]];
    },
    convertToPdfPoint: function PageViewport_convertToPdfPoint(x, y) {
      return Util.applyInverseTransform([x, y], this.transform);
    }
  };
  return PageViewport;
}();
var PDFStringTranslateTable = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2D8, 0x2C7, 0x2C6, 0x2D9, 0x2DD, 0x2DB, 0x2DA, 0x2DC, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2022, 0x2020, 0x2021, 0x2026, 0x2014, 0x2013, 0x192, 0x2044, 0x2039, 0x203A, 0x2212, 0x2030, 0x201E, 0x201C, 0x201D, 0x2018, 0x2019, 0x201A, 0x2122, 0xFB01, 0xFB02, 0x141, 0x152, 0x160, 0x178, 0x17D, 0x131, 0x142, 0x153, 0x161, 0x17E, 0, 0x20AC];
function stringToPDFString(str) {
  var i,
      n = str.length,
      strBuf = [];
  if (str[0] === '\xFE' && str[1] === '\xFF') {
    for (i = 2; i < n; i += 2) {
      strBuf.push(String.fromCharCode(str.charCodeAt(i) << 8 | str.charCodeAt(i + 1)));
    }
  } else {
    for (i = 0; i < n; ++i) {
      var code = PDFStringTranslateTable[str.charCodeAt(i)];
      strBuf.push(code ? String.fromCharCode(code) : str.charAt(i));
    }
  }
  return strBuf.join('');
}
function stringToUTF8String(str) {
  return decodeURIComponent(escape(str));
}
function utf8StringToString(str) {
  return unescape(encodeURIComponent(str));
}
function isEmptyObj(obj) {
  for (var key in obj) {
    return false;
  }
  return true;
}
function isBool(v) {
  return typeof v === 'boolean';
}
function isInt(v) {
  return typeof v === 'number' && (v | 0) === v;
}
function isNum(v) {
  return typeof v === 'number';
}
function isString(v) {
  return typeof v === 'string';
}
function isArray(v) {
  return v instanceof Array;
}
function isArrayBuffer(v) {
  return (typeof v === 'undefined' ? 'undefined' : _typeof(v)) === 'object' && v !== null && v.byteLength !== undefined;
}
function isSpace(ch) {
  return ch === 0x20 || ch === 0x09 || ch === 0x0D || ch === 0x0A;
}
function isNodeJS() {
  return (typeof process === 'undefined' ? 'undefined' : _typeof(process)) === 'object' && process + '' === '[object process]';
}
function createPromiseCapability() {
  var capability = {};
  capability.promise = new Promise(function (resolve, reject) {
    capability.resolve = resolve;
    capability.reject = reject;
  });
  return capability;
}
var StatTimer = function StatTimerClosure() {
  function rpad(str, pad, length) {
    while (str.length < length) {
      str += pad;
    }
    return str;
  }
  function StatTimer() {
    this.started = Object.create(null);
    this.times = [];
    this.enabled = true;
  }
  StatTimer.prototype = {
    time: function StatTimer_time(name) {
      if (!this.enabled) {
        return;
      }
      if (name in this.started) {
        warn('Timer is already running for ' + name);
      }
      this.started[name] = Date.now();
    },
    timeEnd: function StatTimer_timeEnd(name) {
      if (!this.enabled) {
        return;
      }
      if (!(name in this.started)) {
        warn('Timer has not been started for ' + name);
      }
      this.times.push({
        'name': name,
        'start': this.started[name],
        'end': Date.now()
      });
      delete this.started[name];
    },
    toString: function StatTimer_toString() {
      var i, ii;
      var times = this.times;
      var out = '';
      var longest = 0;
      for (i = 0, ii = times.length; i < ii; ++i) {
        var name = times[i]['name'];
        if (name.length > longest) {
          longest = name.length;
        }
      }
      for (i = 0, ii = times.length; i < ii; ++i) {
        var span = times[i];
        var duration = span.end - span.start;
        out += rpad(span['name'], ' ', longest) + ' ' + duration + 'ms\n';
      }
      return out;
    }
  };
  return StatTimer;
}();
var createBlob = function createBlob(data, contentType) {
  if (typeof Blob !== 'undefined') {
    return new Blob([data], { type: contentType });
  }
  throw new Error('The "Blob" constructor is not supported.');
};
var createObjectURL = function createObjectURLClosure() {
  var digits = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
  return function createObjectURL(data, contentType) {
    var forceDataSchema = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;

    if (!forceDataSchema && URL.createObjectURL) {
      var blob = createBlob(data, contentType);
      return URL.createObjectURL(blob);
    }
    var buffer = 'data:' + contentType + ';base64,';
    for (var i = 0, ii = data.length; i < ii; i += 3) {
      var b1 = data[i] & 0xFF;
      var b2 = data[i + 1] & 0xFF;
      var b3 = data[i + 2] & 0xFF;
      var d1 = b1 >> 2,
          d2 = (b1 & 3) << 4 | b2 >> 4;
      var d3 = i + 1 < ii ? (b2 & 0xF) << 2 | b3 >> 6 : 64;
      var d4 = i + 2 < ii ? b3 & 0x3F : 64;
      buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];
    }
    return buffer;
  };
}();
function resolveCall(fn, args) {
  var thisArg = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

  if (!fn) {
    return Promise.resolve(undefined);
  }
  return new Promise(function (resolve, reject) {
    resolve(fn.apply(thisArg, args));
  });
}
function resolveOrReject(capability, success, reason) {
  if (success) {
    capability.resolve();
  } else {
    capability.reject(reason);
  }
}
function finalize(promise) {
  return Promise.resolve(promise).catch(function () {});
}
function MessageHandler(sourceName, targetName, comObj) {
  var _this = this;

  this.sourceName = sourceName;
  this.targetName = targetName;
  this.comObj = comObj;
  this.callbackId = 1;
  this.streamId = 1;
  this.postMessageTransfers = true;
  this.streamSinks = Object.create(null);
  this.streamControllers = Object.create(null);
  var callbacksCapabilities = this.callbacksCapabilities = Object.create(null);
  var ah = this.actionHandler = Object.create(null);
  this._onComObjOnMessage = function (event) {
    var data = event.data;
    if (data.targetName !== _this.sourceName) {
      return;
    }
    if (data.stream) {
      _this._processStreamMessage(data);
    } else if (data.isReply) {
      var callbackId = data.callbackId;
      if (data.callbackId in callbacksCapabilities) {
        var callback = callbacksCapabilities[callbackId];
        delete callbacksCapabilities[callbackId];
        if ('error' in data) {
          callback.reject(data.error);
        } else {
          callback.resolve(data.data);
        }
      } else {
        throw new Error('Cannot resolve callback ' + callbackId);
      }
    } else if (data.action in ah) {
      var action = ah[data.action];
      if (data.callbackId) {
        var _sourceName = _this.sourceName;
        var _targetName = data.sourceName;
        Promise.resolve().then(function () {
          return action[0].call(action[1], data.data);
        }).then(function (result) {
          comObj.postMessage({
            sourceName: _sourceName,
            targetName: _targetName,
            isReply: true,
            callbackId: data.callbackId,
            data: result
          });
        }, function (reason) {
          if (reason instanceof Error) {
            reason = reason + '';
          }
          comObj.postMessage({
            sourceName: _sourceName,
            targetName: _targetName,
            isReply: true,
            callbackId: data.callbackId,
            error: reason
          });
        });
      } else if (data.streamId) {
        _this._createStreamSink(data);
      } else {
        action[0].call(action[1], data.data);
      }
    } else {
      throw new Error('Unknown action from worker: ' + data.action);
    }
  };
  comObj.addEventListener('message', this._onComObjOnMessage);
}
MessageHandler.prototype = {
  on: function on(actionName, handler, scope) {
    var ah = this.actionHandler;
    if (ah[actionName]) {
      throw new Error('There is already an actionName called "' + actionName + '"');
    }
    ah[actionName] = [handler, scope];
  },
  send: function send(actionName, data, transfers) {
    var message = {
      sourceName: this.sourceName,
      targetName: this.targetName,
      action: actionName,
      data: data
    };
    this.postMessage(message, transfers);
  },
  sendWithPromise: function sendWithPromise(actionName, data, transfers) {
    var callbackId = this.callbackId++;
    var message = {
      sourceName: this.sourceName,
      targetName: this.targetName,
      action: actionName,
      data: data,
      callbackId: callbackId
    };
    var capability = createPromiseCapability();
    this.callbacksCapabilities[callbackId] = capability;
    try {
      this.postMessage(message, transfers);
    } catch (e) {
      capability.reject(e);
    }
    return capability.promise;
  },
  sendWithStream: function sendWithStream(actionName, data, queueingStrategy, transfers) {
    var _this2 = this;

    var streamId = this.streamId++;
    var sourceName = this.sourceName;
    var targetName = this.targetName;
    return new _streamsLib.ReadableStream({
      start: function start(controller) {
        var startCapability = createPromiseCapability();
        _this2.streamControllers[streamId] = {
          controller: controller,
          startCall: startCapability,
          isClosed: false
        };
        _this2.postMessage({
          sourceName: sourceName,
          targetName: targetName,
          action: actionName,
          streamId: streamId,
          data: data,
          desiredSize: controller.desiredSize
        });
        return startCapability.promise;
      },
      pull: function pull(controller) {
        var pullCapability = createPromiseCapability();
        _this2.streamControllers[streamId].pullCall = pullCapability;
        _this2.postMessage({
          sourceName: sourceName,
          targetName: targetName,
          stream: 'pull',
          streamId: streamId,
          desiredSize: controller.desiredSize
        });
        return pullCapability.promise;
      },
      cancel: function cancel(reason) {
        var cancelCapability = createPromiseCapability();
        _this2.streamControllers[streamId].cancelCall = cancelCapability;
        _this2.streamControllers[streamId].isClosed = true;
        _this2.postMessage({
          sourceName: sourceName,
          targetName: targetName,
          stream: 'cancel',
          reason: reason,
          streamId: streamId
        });
        return cancelCapability.promise;
      }
    }, queueingStrategy);
  },
  _createStreamSink: function _createStreamSink(data) {
    var _this3 = this;

    var self = this;
    var action = this.actionHandler[data.action];
    var streamId = data.streamId;
    var desiredSize = data.desiredSize;
    var sourceName = this.sourceName;
    var targetName = data.sourceName;
    var capability = createPromiseCapability();
    var sendStreamRequest = function sendStreamRequest(_ref) {
      var stream = _ref.stream,
          chunk = _ref.chunk,
          success = _ref.success,
          reason = _ref.reason;

      _this3.comObj.postMessage({
        sourceName: sourceName,
        targetName: targetName,
        stream: stream,
        streamId: streamId,
        chunk: chunk,
        success: success,
        reason: reason
      });
    };
    var streamSink = {
      enqueue: function enqueue(chunk) {
        var size = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;

        var lastDesiredSize = this.desiredSize;
        this.desiredSize -= size;
        if (lastDesiredSize > 0 && this.desiredSize <= 0) {
          this.sinkCapability = createPromiseCapability();
          this.ready = this.sinkCapability.promise;
        }
        sendStreamRequest({
          stream: 'enqueue',
          chunk: chunk
        });
      },
      close: function close() {
        sendStreamRequest({ stream: 'close' });
        delete self.streamSinks[streamId];
      },
      error: function error(reason) {
        sendStreamRequest({
          stream: 'error',
          reason: reason
        });
      },

      sinkCapability: capability,
      onPull: null,
      onCancel: null,
      desiredSize: desiredSize,
      ready: null
    };
    streamSink.sinkCapability.resolve();
    streamSink.ready = streamSink.sinkCapability.promise;
    this.streamSinks[streamId] = streamSink;
    resolveCall(action[0], [data.data, streamSink], action[1]).then(function () {
      sendStreamRequest({
        stream: 'start_complete',
        success: true
      });
    }, function (reason) {
      sendStreamRequest({
        stream: 'start_complete',
        success: false,
        reason: reason
      });
    });
  },
  _processStreamMessage: function _processStreamMessage(data) {
    var _this4 = this;

    var sourceName = this.sourceName;
    var targetName = data.sourceName;
    var streamId = data.streamId;
    var sendStreamResponse = function sendStreamResponse(_ref2) {
      var stream = _ref2.stream,
          success = _ref2.success,
          reason = _ref2.reason;

      _this4.comObj.postMessage({
        sourceName: sourceName,
        targetName: targetName,
        stream: stream,
        success: success,
        streamId: streamId,
        reason: reason
      });
    };
    var deleteStreamController = function deleteStreamController() {
      Promise.all([_this4.streamControllers[data.streamId].startCall, _this4.streamControllers[data.streamId].pullCall, _this4.streamControllers[data.streamId].cancelCall].map(function (capability) {
        return capability && finalize(capability.promise);
      })).then(function () {
        delete _this4.streamControllers[data.streamId];
      });
    };
    switch (data.stream) {
      case 'start_complete':
        resolveOrReject(this.streamControllers[data.streamId].startCall, data.success, data.reason);
        break;
      case 'pull_complete':
        resolveOrReject(this.streamControllers[data.streamId].pullCall, data.success, data.reason);
        break;
      case 'pull':
        if (!this.streamSinks[data.streamId]) {
          sendStreamResponse({
            stream: 'pull_complete',
            success: true
          });
          break;
        }
        if (this.streamSinks[data.streamId].desiredSize <= 0 && data.desiredSize > 0) {
          this.streamSinks[data.streamId].sinkCapability.resolve();
        }
        this.streamSinks[data.streamId].desiredSize = data.desiredSize;
        resolveCall(this.streamSinks[data.streamId].onPull).then(function () {
          sendStreamResponse({
            stream: 'pull_complete',
            success: true
          });
        }, function (reason) {
          sendStreamResponse({
            stream: 'pull_complete',
            success: false,
            reason: reason
          });
        });
        break;
      case 'enqueue':
        if (!this.streamControllers[data.streamId].isClosed) {
          this.streamControllers[data.streamId].controller.enqueue(data.chunk);
        }
        break;
      case 'close':
        if (this.streamControllers[data.streamId].isClosed) {
          break;
        }
        this.streamControllers[data.streamId].isClosed = true;
        this.streamControllers[data.streamId].controller.close();
        deleteStreamController();
        break;
      case 'error':
        this.streamControllers[data.streamId].controller.error(data.reason);
        deleteStreamController();
        break;
      case 'cancel_complete':
        resolveOrReject(this.streamControllers[data.streamId].cancelCall, data.success, data.reason);
        deleteStreamController();
        break;
      case 'cancel':
        if (!this.streamSinks[data.streamId]) {
          break;
        }
        resolveCall(this.streamSinks[data.streamId].onCancel, [data.reason]).then(function () {
          sendStreamResponse({
            stream: 'cancel_complete',
            success: true
          });
        }, function (reason) {
          sendStreamResponse({
            stream: 'cancel_complete',
            success: false,
            reason: reason
          });
        });
        delete this.streamSinks[data.streamId];
        break;
      default:
        throw new Error('Unexpected stream case');
    }
  },
  postMessage: function postMessage(message, transfers) {
    if (transfers && this.postMessageTransfers) {
      this.comObj.postMessage(message, transfers);
    } else {
      this.comObj.postMessage(message);
    }
  },
  destroy: function destroy() {
    this.comObj.removeEventListener('message', this._onComObjOnMessage);
  }
};
function loadJpegStream(id, imageUrl, objs) {
  var img = new Image();
  img.onload = function loadJpegStream_onloadClosure() {
    objs.resolve(id, img);
  };
  img.onerror = function loadJpegStream_onerrorClosure() {
    objs.resolve(id, null);
    warn('Error during JPEG image loading');
  };
  img.src = imageUrl;
}
exports.FONT_IDENTITY_MATRIX = FONT_IDENTITY_MATRIX;
exports.IDENTITY_MATRIX = IDENTITY_MATRIX;
exports.OPS = OPS;
exports.VERBOSITY_LEVELS = VERBOSITY_LEVELS;
exports.UNSUPPORTED_FEATURES = UNSUPPORTED_FEATURES;
exports.AnnotationBorderStyleType = AnnotationBorderStyleType;
exports.AnnotationFieldFlag = AnnotationFieldFlag;
exports.AnnotationFlag = AnnotationFlag;
exports.AnnotationType = AnnotationType;
exports.FontType = FontType;
exports.ImageKind = ImageKind;
exports.CMapCompressionType = CMapCompressionType;
exports.InvalidPDFException = InvalidPDFException;
exports.MessageHandler = MessageHandler;
exports.MissingDataException = MissingDataException;
exports.MissingPDFException = MissingPDFException;
exports.NativeImageDecoding = NativeImageDecoding;
exports.NotImplementedException = NotImplementedException;
exports.PageViewport = PageViewport;
exports.PasswordException = PasswordException;
exports.PasswordResponses = PasswordResponses;
exports.StatTimer = StatTimer;
exports.StreamType = StreamType;
exports.TextRenderingMode = TextRenderingMode;
exports.UnexpectedResponseException = UnexpectedResponseException;
exports.UnknownErrorException = UnknownErrorException;
exports.Util = Util;
exports.XRefParseException = XRefParseException;
exports.FormatError = FormatError;
exports.arrayByteLength = arrayByteLength;
exports.arraysToBytes = arraysToBytes;
exports.assert = assert;
exports.bytesToString = bytesToString;
exports.createBlob = createBlob;
exports.createPromiseCapability = createPromiseCapability;
exports.createObjectURL = createObjectURL;
exports.deprecated = deprecated;
exports.getLookupTableFactory = getLookupTableFactory;
exports.getVerbosityLevel = getVerbosityLevel;
exports.globalScope = globalScope;
exports.info = info;
exports.isArray = isArray;
exports.isArrayBuffer = isArrayBuffer;
exports.isBool = isBool;
exports.isEmptyObj = isEmptyObj;
exports.isInt = isInt;
exports.isNum = isNum;
exports.isString = isString;
exports.isSpace = isSpace;
exports.isNodeJS = isNodeJS;
exports.isSameOrigin = isSameOrigin;
exports.createValidAbsoluteUrl = createValidAbsoluteUrl;
exports.isLittleEndian = isLittleEndian;
exports.isEvalSupported = isEvalSupported;
exports.loadJpegStream = loadJpegStream;
exports.log2 = log2;
exports.readInt8 = readInt8;
exports.readUint16 = readUint16;
exports.readUint32 = readUint32;
exports.removeNullCharacters = removeNullCharacters;
exports.ReadableStream = _streamsLib.ReadableStream;
exports.setVerbosityLevel = setVerbosityLevel;
exports.shadow = shadow;
exports.string32 = string32;
exports.stringToBytes = stringToBytes;
exports.stringToPDFString = stringToPDFString;
exports.stringToUTF8String = stringToUTF8String;
exports.utf8StringToString = utf8StringToString;
exports.warn = warn;
exports.unreachable = unreachable;