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';
var compatibility = require('./compatibility.js');
var globalScope = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : this;
var FONT_IDENTITY_MATRIX = [
 0.001,
 0,
 0,
 0.001,
 0,
 0
];
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 error(msg) {
 if (verbosity >= VERBOSITY_LEVELS.errors) {
  console.log('Error: ' + msg);
  console.log(backtrace());
 }
 throw new Error(msg);
}
function backtrace() {
 try {
  throw new Error();
 } catch (e) {
  return e.stack ? e.stack.split('\n').slice(2).join('\n') : '';
 }
}
function assert(cond, msg) {
 if (!cond) {
  error(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 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 === '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(2);
 buffer8[0] = 1;
 var buffer16 = new Uint16Array(buffer8.buffer);
 return buffer16[0] === 1;
}
function isEvalSupported() {
 try {
  new Function('');
  return true;
 } catch (e) {
  return false;
 }
}
var Uint32ArrayView = function Uint32ArrayViewClosure() {
 function Uint32ArrayView(buffer, length) {
  this.buffer = buffer;
  this.byteLength = buffer.length;
  this.length = length === undefined ? this.byteLength >> 2 : length;
  ensureUint32ArrayViewProps(this.length);
 }
 Uint32ArrayView.prototype = Object.create(null);
 var uint32ArrayViewSetters = 0;
 function createUint32ArrayProp(index) {
  return {
   get: function () {
    var buffer = this.buffer, offset = index << 2;
    return (buffer[offset] | buffer[offset + 1] << 8 | buffer[offset + 2] << 16 | buffer[offset + 3] << 24) >>> 0;
   },
   set: function (value) {
    var buffer = this.buffer, offset = index << 2;
    buffer[offset] = value & 255;
    buffer[offset + 1] = value >> 8 & 255;
    buffer[offset + 2] = value >> 16 & 255;
    buffer[offset + 3] = value >>> 24 & 255;
   }
  };
 }
 function ensureUint32ArrayViewProps(length) {
  while (uint32ArrayViewSetters < length) {
   Object.defineProperty(Uint32ArrayView.prototype, uint32ArrayViewSetters, createUint32ArrayProp(uint32ArrayViewSetters));
   uint32ArrayViewSetters++;
  }
 }
 return Uint32ArrayView;
}();
exports.Uint32ArrayView = Uint32ArrayView;
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 === 'object' && v !== null && v.byteLength !== undefined;
}
function isSpace(ch) {
 return ch === 0x20 || ch === 0x09 || ch === 0x0D || ch === 0x0A;
}
function isNodeJS() {
 if (typeof __pdfjsdev_webpack__ === 'undefined') {
  return typeof process === 'object' && process + '' === '[object process]';
 }
 return false;
}
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 });
 }
 warn('The "Blob" constructor is not supported.');
};
var createObjectURL = function createObjectURLClosure() {
 var digits = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
 return function createObjectURL(data, contentType, forceDataSchema) {
  if (!forceDataSchema && typeof URL !== 'undefined' && 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 MessageHandler(sourceName, targetName, comObj) {
 this.sourceName = sourceName;
 this.targetName = targetName;
 this.comObj = comObj;
 this.callbackIndex = 1;
 this.postMessageTransfers = true;
 var callbacksCapabilities = this.callbacksCapabilities = Object.create(null);
 var ah = this.actionHandler = Object.create(null);
 this._onComObjOnMessage = function messageHandlerComObjOnMessage(event) {
  var data = event.data;
  if (data.targetName !== this.sourceName) {
   return;
  }
  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 {
    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 {
    action[0].call(action[1], data.data);
   }
  } else {
   error('Unknown action from worker: ' + data.action);
  }
 }.bind(this);
 comObj.addEventListener('message', this._onComObjOnMessage);
}
MessageHandler.prototype = {
 on: function messageHandlerOn(actionName, handler, scope) {
  var ah = this.actionHandler;
  if (ah[actionName]) {
   error('There is already an actionName called "' + actionName + '"');
  }
  ah[actionName] = [
   handler,
   scope
  ];
 },
 send: function messageHandlerSend(actionName, data, transfers) {
  var message = {
   sourceName: this.sourceName,
   targetName: this.targetName,
   action: actionName,
   data: data
  };
  this.postMessage(message, transfers);
 },
 sendWithPromise: function messageHandlerSendWithPromise(actionName, data, transfers) {
  var callbackId = this.callbackIndex++;
  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;
 },
 postMessage: function (message, transfers) {
  if (transfers && this.postMessageTransfers) {
   this.comObj.postMessage(message, transfers);
  } else {
   this.comObj.postMessage(message);
  }
 },
 destroy: function () {
  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.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.arrayByteLength = arrayByteLength;
exports.arraysToBytes = arraysToBytes;
exports.assert = assert;
exports.bytesToString = bytesToString;
exports.createBlob = createBlob;
exports.createPromiseCapability = createPromiseCapability;
exports.createObjectURL = createObjectURL;
exports.deprecated = deprecated;
exports.error = error;
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.setVerbosityLevel = setVerbosityLevel;
exports.shadow = shadow;
exports.string32 = string32;
exports.stringToBytes = stringToBytes;
exports.stringToPDFString = stringToPDFString;
exports.stringToUTF8String = stringToUTF8String;
exports.utf8StringToString = utf8StringToString;
exports.warn = warn;