text: /* 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.
   */
  
  'use strict';
  
  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('pdfjs/core/fonts', ['exports', 'pdfjs/shared/util',
        'pdfjs/core/primitives', 'pdfjs/core/stream', 'pdfjs/core/glyphlist',
        'pdfjs/core/font_renderer', 'pdfjs/core/encodings',
        'pdfjs/core/standard_fonts', 'pdfjs/core/unicode',
        'pdfjs/core/type1_parser', 'pdfjs/core/cff_parser'], factory);
    } else if (typeof exports !== 'undefined') {
      factory(exports, require('../shared/util.js'), require('./primitives.js'),
        require('./stream.js'), require('./glyphlist.js'),
        require('./font_renderer.js'), require('./encodings.js'),
        require('./standard_fonts.js'), require('./unicode.js'),
        require('./type1_parser.js'), require('./cff_parser.js'));
    } else {
      factory((root.pdfjsCoreFonts = {}), root.pdfjsSharedUtil,
        root.pdfjsCorePrimitives, root.pdfjsCoreStream, root.pdfjsCoreGlyphList,
        root.pdfjsCoreFontRenderer, root.pdfjsCoreEncodings,
        root.pdfjsCoreStandardFonts, root.pdfjsCoreUnicode,
        root.pdfjsCoreType1Parser, root.pdfjsCoreCFFParser);
    }
  }(this, function (exports, sharedUtil, corePrimitives, coreStream,
                    coreGlyphList, coreFontRenderer, coreEncodings,
                    coreStandardFonts, coreUnicode, coreType1Parser,
                    coreCFFParser) {
  
  var FONT_IDENTITY_MATRIX = sharedUtil.FONT_IDENTITY_MATRIX;
  var FontType = sharedUtil.FontType;
  var assert = sharedUtil.assert;
  var bytesToString = sharedUtil.bytesToString;
  var error = sharedUtil.error;
  var info = sharedUtil.info;
  var isArray = sharedUtil.isArray;
  var isInt = sharedUtil.isInt;
  var isNum = sharedUtil.isNum;
  var readUint32 = sharedUtil.readUint32;
  var shadow = sharedUtil.shadow;
  var string32 = sharedUtil.string32;
  var warn = sharedUtil.warn;
  var MissingDataException = sharedUtil.MissingDataException;
  var isSpace = sharedUtil.isSpace;
  var Stream = coreStream.Stream;
  var getGlyphsUnicode = coreGlyphList.getGlyphsUnicode;
  var getDingbatsGlyphsUnicode = coreGlyphList.getDingbatsGlyphsUnicode;
  var FontRendererFactory = coreFontRenderer.FontRendererFactory;
  var StandardEncoding = coreEncodings.StandardEncoding;
  var MacRomanEncoding = coreEncodings.MacRomanEncoding;
  var SymbolSetEncoding = coreEncodings.SymbolSetEncoding;
  var ZapfDingbatsEncoding = coreEncodings.ZapfDingbatsEncoding;
  var getEncoding = coreEncodings.getEncoding;
  var getStdFontMap = coreStandardFonts.getStdFontMap;
  var getNonStdFontMap = coreStandardFonts.getNonStdFontMap;
  var getGlyphMapForStandardFonts = coreStandardFonts.getGlyphMapForStandardFonts;
  var getSupplementalGlyphMapForArialBlack =
    coreStandardFonts.getSupplementalGlyphMapForArialBlack;
  var getUnicodeRangeFor = coreUnicode.getUnicodeRangeFor;
  var mapSpecialUnicodeValues = coreUnicode.mapSpecialUnicodeValues;
  var getUnicodeForGlyph = coreUnicode.getUnicodeForGlyph;
  var Type1Parser = coreType1Parser.Type1Parser;
  var CFFStandardStrings = coreCFFParser.CFFStandardStrings;
  var CFFParser = coreCFFParser.CFFParser;
  var CFFCompiler = coreCFFParser.CFFCompiler;
  var CFF = coreCFFParser.CFF;
  var CFFHeader = coreCFFParser.CFFHeader;
  var CFFTopDict = coreCFFParser.CFFTopDict;
  var CFFPrivateDict = coreCFFParser.CFFPrivateDict;
  var CFFStrings = coreCFFParser.CFFStrings;
  var CFFIndex = coreCFFParser.CFFIndex;
  var CFFCharset = coreCFFParser.CFFCharset;
  
  // Unicode Private Use Area
  var PRIVATE_USE_OFFSET_START = 0xE000;
  var PRIVATE_USE_OFFSET_END = 0xF8FF;
  var SKIP_PRIVATE_USE_RANGE_F000_TO_F01F = false;
  
  // PDF Glyph Space Units are one Thousandth of a TextSpace Unit
  // except for Type 3 fonts
  var PDF_GLYPH_SPACE_UNITS = 1000;
  
  // Accented charactars are not displayed properly on Windows, using this flag
  // to control analysis of seac charstrings.
  var SEAC_ANALYSIS_ENABLED = false;
  
  var FontFlags = {
    FixedPitch: 1,
    Serif: 2,
    Symbolic: 4,
    Script: 8,
    Nonsymbolic: 32,
    Italic: 64,
    AllCap: 65536,
    SmallCap: 131072,
    ForceBold: 262144
  };
  
  var MacStandardGlyphOrdering = [
    '.notdef', '.null', 'nonmarkingreturn', 'space', 'exclam', 'quotedbl',
    'numbersign', 'dollar', 'percent', 'ampersand', 'quotesingle', 'parenleft',
    'parenright', 'asterisk', 'plus', 'comma', 'hyphen', 'period', 'slash',
    'zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight',
    'nine', 'colon', 'semicolon', 'less', 'equal', 'greater', 'question', 'at',
    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
    'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'bracketleft',
    'backslash', 'bracketright', 'asciicircum', 'underscore', 'grave', 'a', 'b',
    'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
    'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'braceleft', 'bar', 'braceright',
    'asciitilde', 'Adieresis', 'Aring', 'Ccedilla', 'Eacute', 'Ntilde',
    'Odieresis', 'Udieresis', 'aacute', 'agrave', 'acircumflex', 'adieresis',
    'atilde', 'aring', 'ccedilla', 'eacute', 'egrave', 'ecircumflex', 'edieresis',
    'iacute', 'igrave', 'icircumflex', 'idieresis', 'ntilde', 'oacute', 'ograve',
    'ocircumflex', 'odieresis', 'otilde', 'uacute', 'ugrave', 'ucircumflex',
    'udieresis', 'dagger', 'degree', 'cent', 'sterling', 'section', 'bullet',
    'paragraph', 'germandbls', 'registered', 'copyright', 'trademark', 'acute',
    'dieresis', 'notequal', 'AE', 'Oslash', 'infinity', 'plusminus', 'lessequal',
    'greaterequal', 'yen', 'mu', 'partialdiff', 'summation', 'product', 'pi',
    'integral', 'ordfeminine', 'ordmasculine', 'Omega', 'ae', 'oslash',
    'questiondown', 'exclamdown', 'logicalnot', 'radical', 'florin',
    'approxequal', 'Delta', 'guillemotleft', 'guillemotright', 'ellipsis',
    'nonbreakingspace', 'Agrave', 'Atilde', 'Otilde', 'OE', 'oe', 'endash',
    'emdash', 'quotedblleft', 'quotedblright', 'quoteleft', 'quoteright',
    'divide', 'lozenge', 'ydieresis', 'Ydieresis', 'fraction', 'currency',
    'guilsinglleft', 'guilsinglright', 'fi', 'fl', 'daggerdbl', 'periodcentered',
    'quotesinglbase', 'quotedblbase', 'perthousand', 'Acircumflex',
    'Ecircumflex', 'Aacute', 'Edieresis', 'Egrave', 'Iacute', 'Icircumflex',
    'Idieresis', 'Igrave', 'Oacute', 'Ocircumflex', 'apple', 'Ograve', 'Uacute',
    'Ucircumflex', 'Ugrave', 'dotlessi', 'circumflex', 'tilde', 'macron',
    'breve', 'dotaccent', 'ring', 'cedilla', 'hungarumlaut', 'ogonek', 'caron',
    'Lslash', 'lslash', 'Scaron', 'scaron', 'Zcaron', 'zcaron', 'brokenbar',
    'Eth', 'eth', 'Yacute', 'yacute', 'Thorn', 'thorn', 'minus', 'multiply',
    'onesuperior', 'twosuperior', 'threesuperior', 'onehalf', 'onequarter',
    'threequarters', 'franc', 'Gbreve', 'gbreve', 'Idotaccent', 'Scedilla',
    'scedilla', 'Cacute', 'cacute', 'Ccaron', 'ccaron', 'dcroat'];
  
  function adjustWidths(properties) {
    if (!properties.fontMatrix) {
      return;
    }
    if (properties.fontMatrix[0] === FONT_IDENTITY_MATRIX[0]) {
      return;
    }
    // adjusting width to fontMatrix scale
    var scale = 0.001 / properties.fontMatrix[0];
    var glyphsWidths = properties.widths;
    for (var glyph in glyphsWidths) {
      glyphsWidths[glyph] *= scale;
    }
    properties.defaultWidth *= scale;
  }
  
  function adjustToUnicode(properties, builtInEncoding) {
    if (properties.hasIncludedToUnicodeMap) {
      return; // The font dictionary has a `ToUnicode` entry.
    }
    if (properties.hasEncoding) {
      return; // The font dictionary has an `Encoding` entry.
    }
    if (builtInEncoding === properties.defaultEncoding) {
      return; // No point in trying to adjust `toUnicode` if the encodings match.
    }
    if (properties.toUnicode instanceof IdentityToUnicodeMap) {
      return;
    }
    var toUnicode = [], glyphsUnicodeMap = getGlyphsUnicode();
    for (var charCode in builtInEncoding) {
      var glyphName = builtInEncoding[charCode];
      var unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
      if (unicode !== -1) {
        toUnicode[charCode] = String.fromCharCode(unicode);
      }
    }
    properties.toUnicode.amend(toUnicode);
  }
  
  function getFontType(type, subtype) {
    switch (type) {
      case 'Type1':
        return subtype === 'Type1C' ? FontType.TYPE1C : FontType.TYPE1;
      case 'CIDFontType0':
        return subtype === 'CIDFontType0C' ? FontType.CIDFONTTYPE0C :
          FontType.CIDFONTTYPE0;
      case 'OpenType':
        return FontType.OPENTYPE;
      case 'TrueType':
        return FontType.TRUETYPE;
      case 'CIDFontType2':
        return FontType.CIDFONTTYPE2;
      case 'MMType1':
        return FontType.MMTYPE1;
      case 'Type0':
        return FontType.TYPE0;
      default:
        return FontType.UNKNOWN;
    }
  }
  
  // Some bad PDF generators, e.g. Scribus PDF, include glyph names
  // in a 'uniXXXX' format -- attempting to recover proper ones.
  function recoverGlyphName(name, glyphsUnicodeMap) {
    if (glyphsUnicodeMap[name] !== undefined) {
      return name;
    }
    // The glyph name is non-standard, trying to recover.
    var unicode = getUnicodeForGlyph(name, glyphsUnicodeMap);
    if (unicode !== -1) {
      for (var key in glyphsUnicodeMap) {
        if (glyphsUnicodeMap[key] === unicode) {
          return key;
        }
      }
    }
    info('Unable to recover a standard glyph name for: ' + name);
    return name;
  }
  
  var Glyph = (function GlyphClosure() {
    function Glyph(fontChar, unicode, accent, width, vmetric, operatorListId,
                   isSpace, isInFont) {
      this.fontChar = fontChar;
      this.unicode = unicode;
      this.accent = accent;
      this.width = width;
      this.vmetric = vmetric;
      this.operatorListId = operatorListId;
      this.isSpace = isSpace;
      this.isInFont = isInFont;
    }
  
    Glyph.prototype.matchesForCache = function(fontChar, unicode, accent, width,
                                               vmetric, operatorListId, isSpace,
                                               isInFont) {
      return this.fontChar === fontChar &&
             this.unicode === unicode &&
             this.accent === accent &&
             this.width === width &&
             this.vmetric === vmetric &&
             this.operatorListId === operatorListId &&
             this.isSpace === isSpace &&
             this.isInFont === isInFont;
    };
  
    return Glyph;
  })();
  
  var ToUnicodeMap = (function ToUnicodeMapClosure() {
    function ToUnicodeMap(cmap) {
      // The elements of this._map can be integers or strings, depending on how
      // |cmap| was created.
      this._map = cmap;
    }
  
    ToUnicodeMap.prototype = {
      get length() {
        return this._map.length;
      },
  
      forEach(callback) {
        for (var charCode in this._map) {
          callback(charCode, this._map[charCode].charCodeAt(0));
        }
      },
  
      has(i) {
        return this._map[i] !== undefined;
      },
  
      get(i) {
        return this._map[i];
      },
  
      charCodeOf(value) {
        // `Array.prototype.indexOf` is *extremely* inefficient for arrays which
        // are both very sparse and very large (see issue8372.pdf).
        let map = this._map;
        if (map.length <= 0x10000) {
          return map.indexOf(value);
        }
        for (let charCode in map) {
          if (map[charCode] === value) {
            return (charCode | 0);
          }
        }
        return -1;
      },
  
      amend(map) {
        for (var charCode in map) {
          this._map[charCode] = map[charCode];
        }
      },
    };
  
    return ToUnicodeMap;
  })();
  
  var IdentityToUnicodeMap = (function IdentityToUnicodeMapClosure() {
    function IdentityToUnicodeMap(firstChar, lastChar) {
      this.firstChar = firstChar;
      this.lastChar = lastChar;
    }
  
    IdentityToUnicodeMap.prototype = {
      get length() {
        return (this.lastChar + 1) - this.firstChar;
      },
  
      forEach(callback) {
        for (var i = this.firstChar, ii = this.lastChar; i <= ii; i++) {
          callback(i, i);
        }
      },
  
      has(i) {
        return this.firstChar <= i && i <= this.lastChar;
      },
  
      get(i) {
        if (this.firstChar <= i && i <= this.lastChar) {
          return String.fromCharCode(i);
        }
        return undefined;
      },
  
      charCodeOf(v) {
        return (isInt(v) && v >= this.firstChar && v <= this.lastChar) ? v : -1;
      },
  
      amend(map) {
        error('Should not call amend()');
      },
    };
  
    return IdentityToUnicodeMap;
  })();
  
  var OpenTypeFileBuilder = (function OpenTypeFileBuilderClosure() {
    function writeInt16(dest, offset, num) {
      dest[offset] = (num >> 8) & 0xFF;
      dest[offset + 1] = num & 0xFF;
    }
  
    function writeInt32(dest, offset, num) {
      dest[offset] = (num >> 24) & 0xFF;
      dest[offset + 1] = (num >> 16) & 0xFF;
      dest[offset + 2] = (num >> 8) & 0xFF;
      dest[offset + 3] = num & 0xFF;
    }
  
    function writeData(dest, offset, data) {
      var i, ii;
      if (data instanceof Uint8Array) {
        dest.set(data, offset);
      } else if (typeof data === 'string') {
        for (i = 0, ii = data.length; i < ii; i++) {
          dest[offset++] = data.charCodeAt(i) & 0xFF;
        }
      } else {
        // treating everything else as array
        for (i = 0, ii = data.length; i < ii; i++) {
          dest[offset++] = data[i] & 0xFF;
        }
      }
    }
  
    function OpenTypeFileBuilder(sfnt) {
      this.sfnt = sfnt;
      this.tables = Object.create(null);
    }
  
    OpenTypeFileBuilder.getSearchParams =
        function OpenTypeFileBuilder_getSearchParams(entriesCount, entrySize) {
      var maxPower2 = 1, log2 = 0;
      while ((maxPower2 ^ entriesCount) > maxPower2) {
        maxPower2 <<= 1;
        log2++;
      }
      var searchRange = maxPower2 * entrySize;
      return {
        range: searchRange,
        entry: log2,
        rangeShift: entrySize * entriesCount - searchRange
      };
    };
  
    var OTF_HEADER_SIZE = 12;
    var OTF_TABLE_ENTRY_SIZE = 16;
  
    OpenTypeFileBuilder.prototype = {
      toArray: function OpenTypeFileBuilder_toArray() {
        var sfnt = this.sfnt;
  
        // Tables needs to be written by ascendant alphabetic order
        var tables = this.tables;
        var tablesNames = Object.keys(tables);
        tablesNames.sort();
        var numTables = tablesNames.length;
  
        var i, j, jj, table, tableName;
        // layout the tables data
        var offset = OTF_HEADER_SIZE + numTables * OTF_TABLE_ENTRY_SIZE;
        var tableOffsets = [offset];
        for (i = 0; i < numTables; i++) {
          table = tables[tablesNames[i]];
          var paddedLength = ((table.length + 3) & ~3) >>> 0;
          offset += paddedLength;
          tableOffsets.push(offset);
        }
  
        var file = new Uint8Array(offset);
        // write the table data first (mostly for checksum)
        for (i = 0; i < numTables; i++) {
          table = tables[tablesNames[i]];
          writeData(file, tableOffsets[i], table);
        }
  
        // sfnt version (4 bytes)
        if (sfnt === 'true') {
          // Windows hates the Mac TrueType sfnt version number
          sfnt = string32(0x00010000);
        }
        file[0] = sfnt.charCodeAt(0) & 0xFF;
        file[1] = sfnt.charCodeAt(1) & 0xFF;
        file[2] = sfnt.charCodeAt(2) & 0xFF;
        file[3] = sfnt.charCodeAt(3) & 0xFF;
  
        // numTables (2 bytes)
        writeInt16(file, 4, numTables);
  
        var searchParams = OpenTypeFileBuilder.getSearchParams(numTables, 16);
  
        // searchRange (2 bytes)
        writeInt16(file, 6, searchParams.range);
        // entrySelector (2 bytes)
        writeInt16(file, 8, searchParams.entry);
        // rangeShift (2 bytes)
        writeInt16(file, 10, searchParams.rangeShift);
  
        offset = OTF_HEADER_SIZE;
        // writing table entries
        for (i = 0; i < numTables; i++) {
          tableName = tablesNames[i];
          file[offset] = tableName.charCodeAt(0) & 0xFF;
          file[offset + 1] = tableName.charCodeAt(1) & 0xFF;
          file[offset + 2] = tableName.charCodeAt(2) & 0xFF;
          file[offset + 3] = tableName.charCodeAt(3) & 0xFF;
  
          // checksum
          var checksum = 0;
          for (j = tableOffsets[i], jj = tableOffsets[i + 1]; j < jj; j += 4) {
            var quad = readUint32(file, j);
            checksum = (checksum + quad) >>> 0;
          }
          writeInt32(file, offset + 4, checksum);
  
          // offset
          writeInt32(file, offset + 8, tableOffsets[i]);
          // length
          writeInt32(file, offset + 12, tables[tableName].length);
  
          offset += OTF_TABLE_ENTRY_SIZE;
        }
        return file;
      },
  
      addTable: function OpenTypeFileBuilder_addTable(tag, data) {
        if (tag in this.tables) {
          throw new Error('Table ' + tag + ' already exists');
        }
        this.tables[tag] = data;
      }
    };
  
    return OpenTypeFileBuilder;
  })();
  
  // Problematic Unicode characters in the fonts that needs to be moved to avoid
  // issues when they are painted on the canvas, e.g. complex-script shaping or
  // control/whitespace characters. The ranges are listed in pairs: the first item
  // is a code of the first problematic code, the second one is the next
  // non-problematic code. The ranges must be in sorted order.
  var ProblematicCharRanges = new Int32Array([
    // Control characters.
    0x0000, 0x0020,
    0x007F, 0x00A1,
    0x00AD, 0x00AE,
    // Chars that is used in complex-script shaping.
    0x0600, 0x0780,
    0x08A0, 0x10A0,
    0x1780, 0x1800,
    0x1C00, 0x1C50,
    // General punctuation chars.
    0x2000, 0x2010,
    0x2011, 0x2012,
    0x2028, 0x2030,
    0x205F, 0x2070,
    0x25CC, 0x25CD,
    0x3000, 0x3001,
    0x3164, 0x3165,
    // Chars that is used in complex-script shaping.
    0xAA60, 0xAA80,
    // Specials Unicode block.
    0xFFF0, 0x10000
  ]);
  
  /**
   * 'Font' is the class the outside world should use, it encapsulate all the font
   * decoding logics whatever type it is (assuming the font type is supported).
   *
   * For example to read a Type1 font and to attach it to the document:
   *   var type1Font = new Font("MyFontName", binaryFile, propertiesObject);
   *   type1Font.bind();
   */
  var Font = (function FontClosure() {
    function Font(name, file, properties) {
      var charCode, glyphName, unicode;
  
      this.name = name;
      this.loadedName = properties.loadedName;
      this.isType3Font = properties.isType3Font;
      this.sizes = [];
      this.missingFile = false;
  
      this.glyphCache = Object.create(null);
  
      this.isSerifFont = !!(properties.flags & FontFlags.Serif);
      this.isSymbolicFont = !!(properties.flags & FontFlags.Symbolic);
      this.isMonospace = !!(properties.flags & FontFlags.FixedPitch);
  
      var type = properties.type;
      var subtype = properties.subtype;
      this.type = type;
  
      this.fallbackName = (this.isMonospace ? 'monospace' :
                           (this.isSerifFont ? 'serif' : 'sans-serif'));
  
      this.differences = properties.differences;
      this.widths = properties.widths;
      this.defaultWidth = properties.defaultWidth;
      this.composite = properties.composite;
      this.wideChars = properties.wideChars;
      this.cMap = properties.cMap;
      this.ascent = properties.ascent / PDF_GLYPH_SPACE_UNITS;
      this.descent = properties.descent / PDF_GLYPH_SPACE_UNITS;
      this.fontMatrix = properties.fontMatrix;
      this.bbox = properties.bbox;
  
      this.toUnicode = properties.toUnicode;
  
      this.toFontChar = [];
  
      if (properties.type === 'Type3') {
        for (charCode = 0; charCode < 256; charCode++) {
          this.toFontChar[charCode] = (this.differences[charCode] ||
                                       properties.defaultEncoding[charCode]);
        }
        this.fontType = FontType.TYPE3;
        return;
      }
  
      this.cidEncoding = properties.cidEncoding;
      this.vertical = properties.vertical;
      if (this.vertical) {
        this.vmetrics = properties.vmetrics;
        this.defaultVMetrics = properties.defaultVMetrics;
      }
      var glyphsUnicodeMap;
      if (!file || file.isEmpty) {
        if (file) {
          // Some bad PDF generators will include empty font files,
          // attempting to recover by assuming that no file exists.
          warn('Font file is empty in "' + name + '" (' + this.loadedName + ')');
        }
  
        this.missingFile = true;
        // The file data is not specified. Trying to fix the font name
        // to be used with the canvas.font.
        var fontName = name.replace(/[,_]/g, '-');
        var stdFontMap = getStdFontMap(), nonStdFontMap = getNonStdFontMap();
        var isStandardFont = !!stdFontMap[fontName] ||
          !!(nonStdFontMap[fontName] && stdFontMap[nonStdFontMap[fontName]]);
        fontName = stdFontMap[fontName] || nonStdFontMap[fontName] || fontName;
  
        this.bold = (fontName.search(/bold/gi) !== -1);
        this.italic = ((fontName.search(/oblique/gi) !== -1) ||
                       (fontName.search(/italic/gi) !== -1));
  
        // Use 'name' instead of 'fontName' here because the original
        // name ArialBlack for example will be replaced by Helvetica.
        this.black = (name.search(/Black/g) !== -1);
  
        // if at least one width is present, remeasure all chars when exists
        this.remeasure = Object.keys(this.widths).length > 0;
        if (isStandardFont && type === 'CIDFontType2' &&
            properties.cidEncoding.indexOf('Identity-') === 0) {
          var GlyphMapForStandardFonts = getGlyphMapForStandardFonts();
          // Standard fonts might be embedded as CID font without glyph mapping.
          // Building one based on GlyphMapForStandardFonts.
          var map = [];
          for (charCode in GlyphMapForStandardFonts) {
            map[+charCode] = GlyphMapForStandardFonts[charCode];
          }
          if (/Arial-?Black/i.test(name)) {
            var SupplementalGlyphMapForArialBlack =
              getSupplementalGlyphMapForArialBlack();
            for (charCode in SupplementalGlyphMapForArialBlack) {
              map[+charCode] = SupplementalGlyphMapForArialBlack[charCode];
            }
          }
          var isIdentityUnicode = this.toUnicode instanceof IdentityToUnicodeMap;
          if (!isIdentityUnicode) {
            this.toUnicode.forEach(function(charCode, unicodeCharCode) {
              map[+charCode] = unicodeCharCode;
            });
          }
          this.toFontChar = map;
          this.toUnicode = new ToUnicodeMap(map);
        } else if (/Symbol/i.test(fontName)) {
          this.toFontChar = buildToFontChar(SymbolSetEncoding, getGlyphsUnicode(),
                                            properties.differences);
        } else if (/Dingbats/i.test(fontName)) {
          if (/Wingdings/i.test(name)) {
            warn('Non-embedded Wingdings font, falling back to ZapfDingbats.');
          }
          this.toFontChar = buildToFontChar(ZapfDingbatsEncoding,
                                            getDingbatsGlyphsUnicode(),
                                            properties.differences);
        } else if (isStandardFont) {
          this.toFontChar = buildToFontChar(properties.defaultEncoding,
                                            getGlyphsUnicode(),
                                            properties.differences);
        } else {
          glyphsUnicodeMap = getGlyphsUnicode();
          this.toUnicode.forEach((charCode, unicodeCharCode) => {
            if (!this.composite) {
              glyphName = (properties.differences[charCode] ||
                           properties.defaultEncoding[charCode]);
              unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
              if (unicode !== -1) {
                unicodeCharCode = unicode;
              }
            }
            this.toFontChar[charCode] = unicodeCharCode;
          });
        }
        this.loadedName = fontName.split('-')[0];
        this.loading = false;
        this.fontType = getFontType(type, subtype);
        return;
      }
  
      // Some fonts might use wrong font types for Type1C or CIDFontType0C
      if (subtype === 'Type1C') {
        if (type !== 'Type1' && type !== 'MMType1') {
          // Some TrueType fonts by mistake claim Type1C
          if (isTrueTypeFile(file)) {
            subtype = 'TrueType';
          } else {
            type = 'Type1';
          }
        } else if (isOpenTypeFile(file)) {
          // Sometimes the type/subtype can be a complete lie (see issue7598.pdf).
          type = subtype = 'OpenType';
        }
      }
      if (subtype === 'CIDFontType0C' && type !== 'CIDFontType0') {
        type = 'CIDFontType0';
      }
      if (subtype === 'OpenType') {
        type = 'OpenType';
      }
      // Some CIDFontType0C fonts by mistake claim CIDFontType0.
      if (type === 'CIDFontType0') {
        if (isType1File(file)) {
          subtype = 'CIDFontType0';
        } else if (isOpenTypeFile(file)) {
          // Sometimes the type/subtype can be a complete lie (see issue6782.pdf).
          type = subtype = 'OpenType';
        } else {
          subtype = 'CIDFontType0C';
        }
      }
  
      var data;
      switch (type) {
        case 'MMType1':
          info('MMType1 font (' + name + '), falling back to Type1.');
          /* falls through */
        case 'Type1':
        case 'CIDFontType0':
          this.mimetype = 'font/opentype';
  
          var cff = (subtype === 'Type1C' || subtype === 'CIDFontType0C') ?
            new CFFFont(file, properties) : new Type1Font(name, file, properties);
  
          adjustWidths(properties);
  
          // Wrap the CFF data inside an OTF font file
          data = this.convert(name, cff, properties);
          break;
  
        case 'OpenType':
        case 'TrueType':
        case 'CIDFontType2':
          this.mimetype = 'font/opentype';
  
          // Repair the TrueType file. It is can be damaged in the point of
          // view of the sanitizer
          data = this.checkAndRepair(name, file, properties);
          if (this.isOpenType) {
            adjustWidths(properties);
  
            type = 'OpenType';
          }
          break;
  
        default:
          error('Font ' + type + ' is not supported');
          break;
      }
  
      this.data = data;
      this.fontType = getFontType(type, subtype);
  
      // Transfer some properties again that could change during font conversion
      this.fontMatrix = properties.fontMatrix;
      this.widths = properties.widths;
      this.defaultWidth = properties.defaultWidth;
      this.toUnicode = properties.toUnicode;
      this.encoding = properties.baseEncoding;
      this.seacMap = properties.seacMap;
  
      this.loading = true;
    }
  
    Font.getFontID = (function () {
      var ID = 1;
      return function Font_getFontID() {
        return String(ID++);
      };
    })();
  
    function int16(b0, b1) {
      return (b0 << 8) + b1;
    }
  
    function signedInt16(b0, b1) {
      var value = (b0 << 8) + b1;
      return value & (1 << 15) ? value - 0x10000 : value;
    }
  
    function int32(b0, b1, b2, b3) {
      return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
    }
  
    function string16(value) {
      return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
    }
  
    function safeString16(value) {
      // clamp value to the 16-bit int range
      value = (value > 0x7FFF ? 0x7FFF : (value < -0x8000 ? -0x8000 : value));
      return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
    }
  
    function isTrueTypeFile(file) {
      var header = file.peekBytes(4);
      return readUint32(header, 0) === 0x00010000;
    }
  
    function isOpenTypeFile(file) {
      var header = file.peekBytes(4);
      return bytesToString(header) === 'OTTO';
    }
  
    function isType1File(file) {
      var header = file.peekBytes(2);
      // All Type1 font programs must begin with the comment '%!' (0x25 + 0x21).
      if (header[0] === 0x25 && header[1] === 0x21) {
        return true;
      }
      // ... obviously some fonts violate that part of the specification,
      // please refer to the comment in |Type1Font| below.
      if (header[0] === 0x80 && header[1] === 0x01) { // pfb file header.
        return true;
      }
      return false;
    }
  
    function buildToFontChar(encoding, glyphsUnicodeMap, differences) {
      var toFontChar = [], unicode;
      for (var i = 0, ii = encoding.length; i < ii; i++) {
        unicode = getUnicodeForGlyph(encoding[i], glyphsUnicodeMap);
        if (unicode !== -1) {
          toFontChar[i] = unicode;
        }
      }
      for (var charCode in differences) {
        unicode = getUnicodeForGlyph(differences[charCode], glyphsUnicodeMap);
        if (unicode !== -1) {
          toFontChar[+charCode] = unicode;
        }
      }
      return toFontChar;
    }
  
    /**
     * Helper function for `adjustMapping`.
     * @return {boolean}
     */
    function isProblematicUnicodeLocation(code) {
      // Using binary search to find a range start.
      var i = 0, j = ProblematicCharRanges.length - 1;
      while (i < j) {
        var c = (i + j + 1) >> 1;
        if (code < ProblematicCharRanges[c]) {
          j = c - 1;
        } else {
          i = c;
        }
      }
      // Even index means code in problematic range.
      return !(i & 1);
    }
  
    /**
     * Rebuilds the char code to glyph ID map by trying to replace the char codes
     * with their unicode value. It also moves char codes that are in known
     * problematic locations.
     * @return {Object} Two properties:
     * 'toFontChar' - maps original char codes(the value that will be read
     * from commands such as show text) to the char codes that will be used in the
     * font that we build
     * 'charCodeToGlyphId' - maps the new font char codes to glyph ids
     */
    function adjustMapping(charCodeToGlyphId, properties) {
      var toUnicode = properties.toUnicode;
      var isSymbolic = !!(properties.flags & FontFlags.Symbolic);
      var isIdentityUnicode =
        properties.toUnicode instanceof IdentityToUnicodeMap;
      var newMap = Object.create(null);
      var toFontChar = [];
      var usedFontCharCodes = [];
      var nextAvailableFontCharCode = PRIVATE_USE_OFFSET_START;
      for (var originalCharCode in charCodeToGlyphId) {
        originalCharCode |= 0;
        var glyphId = charCodeToGlyphId[originalCharCode];
        var fontCharCode = originalCharCode;
        // First try to map the value to a unicode position if a non identity map
        // was created.
        var hasUnicodeValue = false;
        if (!isIdentityUnicode && toUnicode.has(originalCharCode)) {
          hasUnicodeValue = true;
          var unicode = toUnicode.get(fontCharCode);
          // TODO: Try to map ligatures to the correct spot.
          if (unicode.length === 1) {
            fontCharCode = unicode.charCodeAt(0);
          }
        }
        // Try to move control characters, special characters and already mapped
        // characters to the private use area since they will not be drawn by
        // canvas if left in their current position. Also, move characters if the
        // font was symbolic and there is only an identity unicode map since the
        // characters probably aren't in the correct position (fixes an issue
        // with firefox and thuluthfont).
        if ((usedFontCharCodes[fontCharCode] !== undefined ||
             isProblematicUnicodeLocation(fontCharCode) ||
             (isSymbolic && !hasUnicodeValue)) &&
            nextAvailableFontCharCode <= PRIVATE_USE_OFFSET_END) { // Room left.
          // Loop to try and find a free spot in the private use area.
          do {
            fontCharCode = nextAvailableFontCharCode++;
  
            if (SKIP_PRIVATE_USE_RANGE_F000_TO_F01F && fontCharCode === 0xF000) {
              fontCharCode = 0xF020;
              nextAvailableFontCharCode = fontCharCode + 1;
            }
  
          } while (usedFontCharCodes[fontCharCode] !== undefined &&
                   nextAvailableFontCharCode <= PRIVATE_USE_OFFSET_END);
        }
  
        newMap[fontCharCode] = glyphId;
        toFontChar[originalCharCode] = fontCharCode;
        usedFontCharCodes[fontCharCode] = true;
      }
      return {
        toFontChar,
        charCodeToGlyphId: newMap,
        nextAvailableFontCharCode,
      };
    }
  
    function getRanges(glyphs, numGlyphs) {
      // Array.sort() sorts by characters, not numerically, so convert to an
      // array of characters.
      var codes = [];
      for (var charCode in glyphs) {
        // Remove an invalid glyph ID mappings to make OTS happy.
        if (glyphs[charCode] >= numGlyphs) {
          continue;
        }
        codes.push({ fontCharCode: charCode | 0, glyphId: glyphs[charCode] });
      }
      codes.sort(function fontGetRangesSort(a, b) {
        return a.fontCharCode - b.fontCharCode;
      });
  
      // Split the sorted codes into ranges.
      var ranges = [];
      var length = codes.length;
      for (var n = 0; n < length; ) { // eslint-disable-line space-in-parens
        var start = codes[n].fontCharCode;
        var codeIndices = [codes[n].glyphId];
        ++n;
        var end = start;
        while (n < length && end + 1 === codes[n].fontCharCode) {
          codeIndices.push(codes[n].glyphId);
          ++end;
          ++n;
          if (end === 0xFFFF) {
            break;
          }
        }
        ranges.push([start, end, codeIndices]);
      }
  
      return ranges;
    }
  
    function createCmapTable(glyphs, numGlyphs) {
      var ranges = getRanges(glyphs, numGlyphs);
      var numTables = ranges[ranges.length - 1][1] > 0xFFFF ? 2 : 1;
      var cmap = '\x00\x00' + // version
                 string16(numTables) +  // numTables
                 '\x00\x03' + // platformID
                 '\x00\x01' + // encodingID
                 string32(4 + numTables * 8); // start of the table record
  
      var i, ii, j, jj;
      for (i = ranges.length - 1; i >= 0; --i) {
        if (ranges[i][0] <= 0xFFFF) {
          break;
        }
      }
      var bmpLength = i + 1;
  
      if (ranges[i][0] < 0xFFFF && ranges[i][1] === 0xFFFF) {
        ranges[i][1] = 0xFFFE;
      }
      var trailingRangesCount = ranges[i][1] < 0xFFFF ? 1 : 0;
      var segCount = bmpLength + trailingRangesCount;
      var searchParams = OpenTypeFileBuilder.getSearchParams(segCount, 2);
  
      // Fill up the 4 parallel arrays describing the segments.
      var startCount = '';
      var endCount = '';
      var idDeltas = '';
      var idRangeOffsets = '';
      var glyphsIds = '';
      var bias = 0;
  
      var range, start, end, codes;
      for (i = 0, ii = bmpLength; i < ii; i++) {
        range = ranges[i];
        start = range[0];
        end = range[1];
        startCount += string16(start);
        endCount += string16(end);
        codes = range[2];
        var contiguous = true;
        for (j = 1, jj = codes.length; j < jj; ++j) {
          if (codes[j] !== codes[j - 1] + 1) {
            contiguous = false;
            break;
          }
        }
        if (!contiguous) {
          var offset = (segCount - i) * 2 + bias * 2;
          bias += (end - start + 1);
  
          idDeltas += string16(0);
          idRangeOffsets += string16(offset);
  
          for (j = 0, jj = codes.length; j < jj; ++j) {
            glyphsIds += string16(codes[j]);
          }
        } else {
          var startCode = codes[0];
  
          idDeltas += string16((startCode - start) & 0xFFFF);
          idRangeOffsets += string16(0);
        }
      }
  
      if (trailingRangesCount > 0) {
        endCount += '\xFF\xFF';
        startCount += '\xFF\xFF';
        idDeltas += '\x00\x01';
        idRangeOffsets += '\x00\x00';
      }
  
      var format314 = '\x00\x00' + // language
                      string16(2 * segCount) +
                      string16(searchParams.range) +
                      string16(searchParams.entry) +
                      string16(searchParams.rangeShift) +
                      endCount + '\x00\x00' + startCount +
                      idDeltas + idRangeOffsets + glyphsIds;
  
      var format31012 = '';
      var header31012 = '';
      if (numTables > 1) {
        cmap += '\x00\x03' + // platformID
                '\x00\x0A' + // encodingID
                string32(4 + numTables * 8 +
                         4 + format314.length); // start of the table record
        format31012 = '';
        for (i = 0, ii = ranges.length; i < ii; i++) {
          range = ranges[i];
          start = range[0];
          codes = range[2];
          var code = codes[0];
          for (j = 1, jj = codes.length; j < jj; ++j) {
            if (codes[j] !== codes[j - 1] + 1) {
              end = range[0] + j - 1;
              format31012 += string32(start) + // startCharCode
                             string32(end) + // endCharCode
                             string32(code); // startGlyphID
              start = end + 1;
              code = codes[j];
            }
          }
          format31012 += string32(start) + // startCharCode
                         string32(range[1]) + // endCharCode
                         string32(code); // startGlyphID
        }
        header31012 = '\x00\x0C' + // format
                      '\x00\x00' + // reserved
                      string32(format31012.length + 16) + // length
                      '\x00\x00\x00\x00' + // language
                      string32(format31012.length / 12); // nGroups
      }
  
      return cmap + '\x00\x04' + // format
                    string16(format314.length + 4) + // length
                    format314 + header31012 + format31012;
    }
  
    function validateOS2Table(os2) {
      var stream = new Stream(os2.data);
      var version = stream.getUint16();
      // TODO verify all OS/2 tables fields, but currently we validate only those
      // that give us issues
      stream.getBytes(60); // skipping type, misc sizes, panose, unicode ranges
      var selection = stream.getUint16();
      if (version < 4 && (selection & 0x0300)) {
        return false;
      }
      var firstChar = stream.getUint16();
      var lastChar = stream.getUint16();
      if (firstChar > lastChar) {
        return false;
      }
      stream.getBytes(6); // skipping sTypoAscender/Descender/LineGap
      var usWinAscent = stream.getUint16();
      if (usWinAscent === 0) { // makes font unreadable by windows
        return false;
      }
  
      // OS/2 appears to be valid, resetting some fields
      os2.data[8] = os2.data[9] = 0; // IE rejects fonts if fsType != 0
      return true;
    }
  
    function createOS2Table(properties, charstrings, override) {
      override = override || {
        unitsPerEm: 0,
        yMax: 0,
        yMin: 0,
        ascent: 0,
        descent: 0
      };
  
      var ulUnicodeRange1 = 0;
      var ulUnicodeRange2 = 0;
      var ulUnicodeRange3 = 0;
      var ulUnicodeRange4 = 0;
  
      var firstCharIndex = null;
      var lastCharIndex = 0;
  
      if (charstrings) {
        for (var code in charstrings) {
          code |= 0;
          if (firstCharIndex > code || !firstCharIndex) {
            firstCharIndex = code;
          }
          if (lastCharIndex < code) {
            lastCharIndex = code;
          }
  
          var position = getUnicodeRangeFor(code);
          if (position < 32) {
            ulUnicodeRange1 |= 1 << position;
          } else if (position < 64) {
            ulUnicodeRange2 |= 1 << position - 32;
          } else if (position < 96) {
            ulUnicodeRange3 |= 1 << position - 64;
          } else if (position < 123) {
            ulUnicodeRange4 |= 1 << position - 96;
          } else {
            error('Unicode ranges Bits > 123 are reserved for internal usage');
          }
        }
      } else {
        // TODO
        firstCharIndex = 0;
        lastCharIndex = 255;
      }
  
      var bbox = properties.bbox || [0, 0, 0, 0];
      var unitsPerEm = (override.unitsPerEm ||
                        1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0]);
  
      // if the font units differ to the PDF glyph space units
      // then scale up the values
      var scale = (properties.ascentScaled ? 1.0 :
                   unitsPerEm / PDF_GLYPH_SPACE_UNITS);
  
      var typoAscent = (override.ascent ||
                        Math.round(scale * (properties.ascent || bbox[3])));
      var typoDescent = (override.descent ||
                         Math.round(scale * (properties.descent || bbox[1])));
      if (typoDescent > 0 && properties.descent > 0 && bbox[1] < 0) {
        typoDescent = -typoDescent; // fixing incorrect descent
      }
      var winAscent = override.yMax || typoAscent;
      var winDescent = -override.yMin || -typoDescent;
  
      return '\x00\x03' + // version
             '\x02\x24' + // xAvgCharWidth
             '\x01\xF4' + // usWeightClass
             '\x00\x05' + // usWidthClass
             '\x00\x00' + // fstype (0 to let the font loads via font-face on IE)
             '\x02\x8A' + // ySubscriptXSize
             '\x02\xBB' + // ySubscriptYSize
             '\x00\x00' + // ySubscriptXOffset
             '\x00\x8C' + // ySubscriptYOffset
             '\x02\x8A' + // ySuperScriptXSize
             '\x02\xBB' + // ySuperScriptYSize
             '\x00\x00' + // ySuperScriptXOffset
             '\x01\xDF' + // ySuperScriptYOffset
             '\x00\x31' + // yStrikeOutSize
             '\x01\x02' + // yStrikeOutPosition
             '\x00\x00' + // sFamilyClass
             '\x00\x00\x06' +
             String.fromCharCode(properties.fixedPitch ? 0x09 : 0x00) +
             '\x00\x00\x00\x00\x00\x00' + // Panose
             string32(ulUnicodeRange1) + // ulUnicodeRange1 (Bits 0-31)
             string32(ulUnicodeRange2) + // ulUnicodeRange2 (Bits 32-63)
             string32(ulUnicodeRange3) + // ulUnicodeRange3 (Bits 64-95)
             string32(ulUnicodeRange4) + // ulUnicodeRange4 (Bits 96-127)
             '\x2A\x32\x31\x2A' + // achVendID
             string16(properties.italicAngle ? 1 : 0) + // fsSelection
             string16(firstCharIndex ||
                      properties.firstChar) + // usFirstCharIndex
             string16(lastCharIndex || properties.lastChar) +  // usLastCharIndex
             string16(typoAscent) + // sTypoAscender
             string16(typoDescent) + // sTypoDescender
             '\x00\x64' + // sTypoLineGap (7%-10% of the unitsPerEM value)
             string16(winAscent) + // usWinAscent
             string16(winDescent) + // usWinDescent
             '\x00\x00\x00\x00' + // ulCodePageRange1 (Bits 0-31)
             '\x00\x00\x00\x00' + // ulCodePageRange2 (Bits 32-63)
             string16(properties.xHeight) + // sxHeight
             string16(properties.capHeight) + // sCapHeight
             string16(0) + // usDefaultChar
             string16(firstCharIndex || properties.firstChar) + // usBreakChar
             '\x00\x03';  // usMaxContext
    }
  
    function createPostTable(properties) {
      var angle = Math.floor(properties.italicAngle * (Math.pow(2, 16)));
      return ('\x00\x03\x00\x00' + // Version number
              string32(angle) + // italicAngle
              '\x00\x00' + // underlinePosition
              '\x00\x00' + // underlineThickness
              string32(properties.fixedPitch) + // isFixedPitch
              '\x00\x00\x00\x00' + // minMemType42
              '\x00\x00\x00\x00' + // maxMemType42
              '\x00\x00\x00\x00' + // minMemType1
              '\x00\x00\x00\x00');  // maxMemType1
    }
  
    function createNameTable(name, proto) {
      if (!proto) {
        proto = [[], []]; // no strings and unicode strings
      }
  
      var strings = [
        proto[0][0] || 'Original licence',  // 0.Copyright
        proto[0][1] || name,                // 1.Font family
        proto[0][2] || 'Unknown',           // 2.Font subfamily (font weight)
        proto[0][3] || 'uniqueID',          // 3.Unique ID
        proto[0][4] || name,                // 4.Full font name
        proto[0][5] || 'Version 0.11',      // 5.Version
        proto[0][6] || '',                  // 6.Postscript name
        proto[0][7] || 'Unknown',           // 7.Trademark
        proto[0][8] || 'Unknown',           // 8.Manufacturer
        proto[0][9] || 'Unknown'            // 9.Designer
      ];
  
      // Mac want 1-byte per character strings while Windows want
      // 2-bytes per character, so duplicate the names table
      var stringsUnicode = [];
      var i, ii, j, jj, str;
      for (i = 0, ii = strings.length; i < ii; i++) {
        str = proto[1][i] || strings[i];
  
        var strBufUnicode = [];
        for (j = 0, jj = str.length; j < jj; j++) {
          strBufUnicode.push(string16(str.charCodeAt(j)));
        }
        stringsUnicode.push(strBufUnicode.join(''));
      }
  
      var names = [strings, stringsUnicode];
      var platforms = ['\x00\x01', '\x00\x03'];
      var encodings = ['\x00\x00', '\x00\x01'];
      var languages = ['\x00\x00', '\x04\x09'];
  
      var namesRecordCount = strings.length * platforms.length;
      var nameTable =
        '\x00\x00' +                           // format
        string16(namesRecordCount) +           // Number of names Record
        string16(namesRecordCount * 12 + 6);   // Storage
  
      // Build the name records field
      var strOffset = 0;
      for (i = 0, ii = platforms.length; i < ii; i++) {
        var strs = names[i];
        for (j = 0, jj = strs.length; j < jj; j++) {
          str = strs[j];
          var nameRecord =
            platforms[i] + // platform ID
            encodings[i] + // encoding ID
            languages[i] + // language ID
            string16(j) + // name ID
            string16(str.length) +
            string16(strOffset);
          nameTable += nameRecord;
          strOffset += str.length;
        }
      }
  
      nameTable += strings.join('') + stringsUnicode.join('');
      return nameTable;
    }
  
    Font.prototype = {
      name: null,
      font: null,
      mimetype: null,
      encoding: null,
      get renderer() {
        var renderer = FontRendererFactory.create(this, SEAC_ANALYSIS_ENABLED);
        return shadow(this, 'renderer', renderer);
      },
  
      exportData: function Font_exportData() {
        // TODO remove enumerating of the properties, e.g. hardcode exact names.
        var data = {};
        for (var i in this) {
          if (this.hasOwnProperty(i)) {
            data[i] = this[i];
          }
        }
        return data;
      },
  
      checkAndRepair: function Font_checkAndRepair(name, font, properties) {
        function readTableEntry(file) {
          var tag = bytesToString(file.getBytes(4));
  
          var checksum = file.getInt32() >>> 0;
          var offset = file.getInt32() >>> 0;
          var length = file.getInt32() >>> 0;
  
          // Read the table associated data
          var previousPosition = file.pos;
          file.pos = file.start ? file.start : 0;
          file.skip(offset);
          var data = file.getBytes(length);
          file.pos = previousPosition;
  
          if (tag === 'head') {
            // clearing checksum adjustment
            data[8] = data[9] = data[10] = data[11] = 0;
            data[17] |= 0x20; // Set font optimized for cleartype flag.
          }
  
          return {
            tag,
            checksum,
            length,
            offset,
            data,
          };
        }
  
        function readOpenTypeHeader(ttf) {
          return {
            version: bytesToString(ttf.getBytes(4)),
            numTables: ttf.getUint16(),
            searchRange: ttf.getUint16(),
            entrySelector: ttf.getUint16(),
            rangeShift: ttf.getUint16()
          };
        }
  
        /**
         * Read the appropriate subtable from the cmap according to 9.6.6.4 from
         * PDF spec
         */
        function readCmapTable(cmap, font, isSymbolicFont, hasEncoding) {
          if (!cmap) {
            warn('No cmap table available.');
            return {
              platformId: -1,
              encodingId: -1,
              mappings: [],
              hasShortCmap: false
            };
          }
          var segment;
          var start = (font.start ? font.start : 0) + cmap.offset;
          font.pos = start;
  
          font.getUint16(); // version
          var numTables = font.getUint16();
  
          var potentialTable;
          var canBreak = false;
          // There's an order of preference in terms of which cmap subtable to
          // use:
          // - non-symbolic fonts the preference is a 3,1 table then a 1,0 table
          // - symbolic fonts the preference is a 3,0 table then a 1,0 table
          // The following takes advantage of the fact that the tables are sorted
          // to work.
          for (var i = 0; i < numTables; i++) {
            var platformId = font.getUint16();
            var encodingId = font.getUint16();
            var offset = font.getInt32() >>> 0;
            var useTable = false;
  
            if (platformId === 0 && encodingId === 0) {
              useTable = true;
              // Continue the loop since there still may be a higher priority
              // table.
            } else if (platformId === 1 && encodingId === 0) {
              useTable = true;
              // Continue the loop since there still may be a higher priority
              // table.
            } else if (platformId === 3 && encodingId === 1 &&
                       (hasEncoding || !potentialTable)) {
              useTable = true;
              if (!isSymbolicFont) {
                canBreak = true;
              }
            } else if (isSymbolicFont && platformId === 3 && encodingId === 0) {
              useTable = true;
              canBreak = true;
            }
  
            if (useTable) {
              potentialTable = {
                platformId,
                encodingId,
                offset,
              };
            }
            if (canBreak) {
              break;
            }
          }
  
          if (potentialTable) {
            font.pos = start + potentialTable.offset;
          }
          if (!potentialTable || font.peekByte() === -1) {
            warn('Could not find a preferred cmap table.');
            return {
              platformId: -1,
              encodingId: -1,
              mappings: [],
              hasShortCmap: false
            };
          }
  
          var format = font.getUint16();
          font.getUint16(); // length
          font.getUint16(); // language
  
          var hasShortCmap = false;
          var mappings = [];
          var j, glyphId;
  
          // TODO(mack): refactor this cmap subtable reading logic out
          if (format === 0) {
            for (j = 0; j < 256; j++) {
              var index = font.getByte();
              if (!index) {
                continue;
              }
              mappings.push({
                charCode: j,
                glyphId: index
              });
            }
            hasShortCmap = true;
          } else if (format === 4) {
            // re-creating the table in format 4 since the encoding
            // might be changed
            var segCount = (font.getUint16() >> 1);
            font.getBytes(6); // skipping range fields
            var segIndex, segments = [];
            for (segIndex = 0; segIndex < segCount; segIndex++) {
              segments.push({ end: font.getUint16() });
            }
            font.getUint16();
            for (segIndex = 0; segIndex < segCount; segIndex++) {
              segments[segIndex].start = font.getUint16();
            }
  
            for (segIndex = 0; segIndex < segCount; segIndex++) {
              segments[segIndex].delta = font.getUint16();
            }
  
            var offsetsCount = 0;
            for (segIndex = 0; segIndex < segCount; segIndex++) {
              segment = segments[segIndex];
              var rangeOffset = font.getUint16();
              if (!rangeOffset) {
                segment.offsetIndex = -1;
                continue;
              }
  
              var offsetIndex = (rangeOffset >> 1) - (segCount - segIndex);
              segment.offsetIndex = offsetIndex;
              offsetsCount = Math.max(offsetsCount, offsetIndex +
                                      segment.end - segment.start + 1);
            }
  
            var offsets = [];
            for (j = 0; j < offsetsCount; j++) {
              offsets.push(font.getUint16());
            }
  
            for (segIndex = 0; segIndex < segCount; segIndex++) {
              segment = segments[segIndex];
              start = segment.start;
              var end = segment.end;
              var delta = segment.delta;
              offsetIndex = segment.offsetIndex;
  
              for (j = start; j <= end; j++) {
                if (j === 0xFFFF) {
                  continue;
                }
  
                glyphId = (offsetIndex < 0 ?
                           j : offsets[offsetIndex + j - start]);
                glyphId = (glyphId + delta) & 0xFFFF;
                mappings.push({
                  charCode: j,
                  glyphId,
                });
              }
            }
          } else if (format === 6) {
            // Format 6 is a 2-bytes dense mapping, which means the font data
            // lives glue together even if they are pretty far in the unicode
            // table. (This looks weird, so I can have missed something), this
            // works on Linux but seems to fails on Mac so let's rewrite the
            // cmap table to a 3-1-4 style
            var firstCode = font.getUint16();
            var entryCount = font.getUint16();
  
            for (j = 0; j < entryCount; j++) {
              glyphId = font.getUint16();
              var charCode = firstCode + j;
  
              mappings.push({
                charCode,
                glyphId,
              });
            }
          } else {
            warn('cmap table has unsupported format: ' + format);
            return {
              platformId: -1,
              encodingId: -1,
              mappings: [],
              hasShortCmap: false
            };
          }
  
          // removing duplicate entries
          mappings.sort(function (a, b) {
            return a.charCode - b.charCode;
          });
          for (i = 1; i < mappings.length; i++) {
            if (mappings[i - 1].charCode === mappings[i].charCode) {
              mappings.splice(i, 1);
              i--;
            }
          }
  
          return {
            platformId: potentialTable.platformId,
            encodingId: potentialTable.encodingId,
            mappings,
            hasShortCmap,
          };
        }
  
        function sanitizeMetrics(font, header, metrics, numGlyphs) {
          if (!header) {
            if (metrics) {
              metrics.data = null;
            }
            return;
          }
  
          font.pos = (font.start ? font.start : 0) + header.offset;
          font.pos += header.length - 2;
          var numOfMetrics = font.getUint16();
  
          if (numOfMetrics > numGlyphs) {
            info('The numOfMetrics (' + numOfMetrics + ') should not be ' +
                 'greater than the numGlyphs (' + numGlyphs + ')');
            // Reduce numOfMetrics if it is greater than numGlyphs
            numOfMetrics = numGlyphs;
            header.data[34] = (numOfMetrics & 0xff00) >> 8;
            header.data[35] = numOfMetrics & 0x00ff;
          }
  
          var numOfSidebearings = numGlyphs - numOfMetrics;
          var numMissing = numOfSidebearings -
            ((metrics.length - numOfMetrics * 4) >> 1);
  
          if (numMissing > 0) {
            // For each missing glyph, we set both the width and lsb to 0 (zero).
            // Since we need to add two properties for each glyph, this explains
            // the use of |numMissing * 2| when initializing the typed array.
            var entries = new Uint8Array(metrics.length + numMissing * 2);
            entries.set(metrics.data);
            metrics.data = entries;
          }
        }
  
        function sanitizeGlyph(source, sourceStart, sourceEnd, dest, destStart,
                               hintsValid) {
          if (sourceEnd - sourceStart <= 12) {
            // glyph with data less than 12 is invalid one
            return 0;
          }
          var glyf = source.subarray(sourceStart, sourceEnd);
          var contoursCount = (glyf[0] << 8) | glyf[1];
          if (contoursCount & 0x8000) {
            // complex glyph, writing as is
            dest.set(glyf, destStart);
            return glyf.length;
          }
  
          var i, j = 10, flagsCount = 0;
          for (i = 0; i < contoursCount; i++) {
            var endPoint = (glyf[j] << 8) | glyf[j + 1];
            flagsCount = endPoint + 1;
            j += 2;
          }
          // skipping instructions
          var instructionsStart = j;
          var instructionsLength = (glyf[j] << 8) | glyf[j + 1];
          j += 2 + instructionsLength;
          var instructionsEnd = j;
          // validating flags
          var coordinatesLength = 0;
          for (i = 0; i < flagsCount; i++) {
            var flag = glyf[j++];
            if (flag & 0xC0) {
              // reserved flags must be zero, cleaning up
              glyf[j - 1] = flag & 0x3F;
            }
            var xyLength = ((flag & 2) ? 1 : (flag & 16) ? 0 : 2) +
                           ((flag & 4) ? 1 : (flag & 32) ? 0 : 2);
            coordinatesLength += xyLength;
            if (flag & 8) {
              var repeat = glyf[j++];
              i += repeat;
              coordinatesLength += repeat * xyLength;
            }
          }
          // glyph without coordinates will be rejected
          if (coordinatesLength === 0) {
            return 0;
          }
          var glyphDataLength = j + coordinatesLength;
          if (glyphDataLength > glyf.length) {
            // not enough data for coordinates
            return 0;
          }
          if (!hintsValid && instructionsLength > 0) {
            dest.set(glyf.subarray(0, instructionsStart), destStart);
            dest.set([0, 0], destStart + instructionsStart);
            dest.set(glyf.subarray(instructionsEnd, glyphDataLength),
                     destStart + instructionsStart + 2);
            glyphDataLength -= instructionsLength;
            if (glyf.length - glyphDataLength > 3) {
              glyphDataLength = (glyphDataLength + 3) & ~3;
            }
            return glyphDataLength;
          }
          if (glyf.length - glyphDataLength > 3) {
            // truncating and aligning to 4 bytes the long glyph data
            glyphDataLength = (glyphDataLength + 3) & ~3;
            dest.set(glyf.subarray(0, glyphDataLength), destStart);
            return glyphDataLength;
          }
          // glyph data is fine
          dest.set(glyf, destStart);
          return glyf.length;
        }
  
        function sanitizeHead(head, numGlyphs, locaLength) {
          var data = head.data;
  
          // Validate version:
          // Should always be 0x00010000
          var version = int32(data[0], data[1], data[2], data[3]);
          if (version >> 16 !== 1) {
            info('Attempting to fix invalid version in head table: ' + version);
            data[0] = 0;
            data[1] = 1;
            data[2] = 0;
            data[3] = 0;
          }
  
          var indexToLocFormat = int16(data[50], data[51]);
          if (indexToLocFormat < 0 || indexToLocFormat > 1) {
            info('Attempting to fix invalid indexToLocFormat in head table: ' +
                 indexToLocFormat);
  
            // The value of indexToLocFormat should be 0 if the loca table
            // consists of short offsets, and should be 1 if the loca table
            // consists of long offsets.
            //
            // The number of entries in the loca table should be numGlyphs + 1.
            //
            // Using this information, we can work backwards to deduce if the
            // size of each offset in the loca table, and thus figure out the
            // appropriate value for indexToLocFormat.
  
            var numGlyphsPlusOne = numGlyphs + 1;
            if (locaLength === numGlyphsPlusOne << 1) {
              // 0x0000 indicates the loca table consists of short offsets
              data[50] = 0;
              data[51] = 0;
            } else if (locaLength === numGlyphsPlusOne << 2) {
              // 0x0001 indicates the loca table consists of long offsets
              data[50] = 0;
              data[51] = 1;
            } else {
              warn('Could not fix indexToLocFormat: ' + indexToLocFormat);
            }
          }
        }
  
        function sanitizeGlyphLocations(loca, glyf, numGlyphs,
                                        isGlyphLocationsLong, hintsValid,
                                        dupFirstEntry) {
          var itemSize, itemDecode, itemEncode;
          if (isGlyphLocationsLong) {
            itemSize = 4;
            itemDecode = function fontItemDecodeLong(data, offset) {
              return (data[offset] << 24) | (data[offset + 1] << 16) |
                     (data[offset + 2] << 8) | data[offset + 3];
            };
            itemEncode = function fontItemEncodeLong(data, offset, value) {
              data[offset] = (value >>> 24) & 0xFF;
              data[offset + 1] = (value >> 16) & 0xFF;
              data[offset + 2] = (value >> 8) & 0xFF;
              data[offset + 3] = value & 0xFF;
            };
          } else {
            itemSize = 2;
            itemDecode = function fontItemDecode(data, offset) {
              return (data[offset] << 9) | (data[offset + 1] << 1);
            };
            itemEncode = function fontItemEncode(data, offset, value) {
              data[offset] = (value >> 9) & 0xFF;
              data[offset + 1] = (value >> 1) & 0xFF;
            };
          }
          var locaData = loca.data;
          var locaDataSize = itemSize * (1 + numGlyphs);
          // is loca.data too short or long?
          if (locaData.length !== locaDataSize) {
            locaData = new Uint8Array(locaDataSize);
            locaData.set(loca.data.subarray(0, locaDataSize));
            loca.data = locaData;
          }
          // removing the invalid glyphs
          var oldGlyfData = glyf.data;
          var oldGlyfDataLength = oldGlyfData.length;
          var newGlyfData = new Uint8Array(oldGlyfDataLength);
          var startOffset = itemDecode(locaData, 0);
          var writeOffset = 0;
          var missingGlyphData = Object.create(null);
          itemEncode(locaData, 0, writeOffset);
          var i, j;
          for (i = 0, j = itemSize; i < numGlyphs; i++, j += itemSize) {
            var endOffset = itemDecode(locaData, j);
            if (endOffset > oldGlyfDataLength &&
                ((oldGlyfDataLength + 3) & ~3) === endOffset) {
              // Aspose breaks fonts by aligning the glyphs to the qword, but not
              // the glyf table size, which makes last glyph out of range.
              endOffset = oldGlyfDataLength;
            }
            if (endOffset > oldGlyfDataLength) {
              // glyph end offset points outside glyf data, rejecting the glyph
              itemEncode(locaData, j, writeOffset);
              startOffset = endOffset;
              continue;
            }
  
            if (startOffset === endOffset) {
              missingGlyphData[i] = true;
            }
  
            var newLength = sanitizeGlyph(oldGlyfData, startOffset, endOffset,
                                          newGlyfData, writeOffset, hintsValid);
            writeOffset += newLength;
            itemEncode(locaData, j, writeOffset);
            startOffset = endOffset;
          }
  
          if (writeOffset === 0) {
            // glyf table cannot be empty -- redoing the glyf and loca tables
            // to have single glyph with one point
            var simpleGlyph = new Uint8Array(
              [0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 49, 0]);
            for (i = 0, j = itemSize; i < numGlyphs; i++, j += itemSize) {
              itemEncode(locaData, j, simpleGlyph.length);
            }
            glyf.data = simpleGlyph;
            return missingGlyphData;
          }
  
          if (dupFirstEntry) {
            var firstEntryLength = itemDecode(locaData, itemSize);
            if (newGlyfData.length > firstEntryLength + writeOffset) {
              glyf.data = newGlyfData.subarray(0, firstEntryLength + writeOffset);
            } else {
              glyf.data = new Uint8Array(firstEntryLength + writeOffset);
              glyf.data.set(newGlyfData.subarray(0, writeOffset));
            }
            glyf.data.set(newGlyfData.subarray(0, firstEntryLength), writeOffset);
            itemEncode(loca.data, locaData.length - itemSize,
                       writeOffset + firstEntryLength);
          } else {
            glyf.data = newGlyfData.subarray(0, writeOffset);
          }
          return missingGlyphData;
        }
  
        function readPostScriptTable(post, properties, maxpNumGlyphs) {
          var start = (font.start ? font.start : 0) + post.offset;
          font.pos = start;
  
          var length = post.length, end = start + length;
          var version = font.getInt32();
          // skip rest to the tables
          font.getBytes(28);
  
          var glyphNames;
          var valid = true;
          var i;
  
          switch (version) {
            case 0x00010000:
              glyphNames = MacStandardGlyphOrdering;
              break;
            case 0x00020000:
              var numGlyphs = font.getUint16();
              if (numGlyphs !== maxpNumGlyphs) {
                valid = false;
                break;
              }
              var glyphNameIndexes = [];
              for (i = 0; i < numGlyphs; ++i) {
                var index = font.getUint16();
                if (index >= 32768) {
                  valid = false;
                  break;
                }
                glyphNameIndexes.push(index);
              }
              if (!valid) {
                break;
              }
              var customNames = [];
              var strBuf = [];
              while (font.pos < end) {
                var stringLength = font.getByte();
                strBuf.length = stringLength;
                for (i = 0; i < stringLength; ++i) {
                  strBuf[i] = String.fromCharCode(font.getByte());
                }
                customNames.push(strBuf.join(''));
              }
              glyphNames = [];
              for (i = 0; i < numGlyphs; ++i) {
                var j = glyphNameIndexes[i];
                if (j < 258) {
                  glyphNames.push(MacStandardGlyphOrdering[j]);
                  continue;
                }
                glyphNames.push(customNames[j - 258]);
              }
              break;
            case 0x00030000:
              break;
            default:
              warn('Unknown/unsupported post table version ' + version);
              valid = false;
              if (properties.defaultEncoding) {
                glyphNames = properties.defaultEncoding;
              }
              break;
          }
          properties.glyphNames = glyphNames;
          return valid;
        }
  
        function readNameTable(nameTable) {
          var start = (font.start ? font.start : 0) + nameTable.offset;
          font.pos = start;
  
          var names = [[], []];
          var length = nameTable.length, end = start + length;
          var format = font.getUint16();
          var FORMAT_0_HEADER_LENGTH = 6;
          if (format !== 0 || length < FORMAT_0_HEADER_LENGTH) {
            // unsupported name table format or table "too" small
            return names;
          }
          var numRecords = font.getUint16();
          var stringsStart = font.getUint16();
          var records = [];
          var NAME_RECORD_LENGTH = 12;
          var i, ii;
  
          for (i = 0; i < numRecords &&
                          font.pos + NAME_RECORD_LENGTH <= end; i++) {
            var r = {
              platform: font.getUint16(),
              encoding: font.getUint16(),
              language: font.getUint16(),
              name: font.getUint16(),
              length: font.getUint16(),
              offset: font.getUint16()
            };
            // using only Macintosh and Windows platform/encoding names
            if ((r.platform === 1 && r.encoding === 0 && r.language === 0) ||
                (r.platform === 3 && r.encoding === 1 && r.language === 0x409)) {
              records.push(r);
            }
          }
          for (i = 0, ii = records.length; i < ii; i++) {
            var record = records[i];
            if (record.length <= 0) {
              continue; // Nothing to process, ignoring.
            }
            var pos = start + stringsStart + record.offset;
            if (pos + record.length > end) {
              continue; // outside of name table, ignoring
            }
            font.pos = pos;
            var nameIndex = record.name;
            if (record.encoding) {
              // unicode
              var str = '';
              for (var j = 0, jj = record.length; j < jj; j += 2) {
                str += String.fromCharCode(font.getUint16());
              }
              names[1][nameIndex] = str;
            } else {
              names[0][nameIndex] = bytesToString(font.getBytes(record.length));
            }
          }
          return names;
        }
  
        var TTOpsStackDeltas = [
          0, 0, 0, 0, 0, 0, 0, 0, -2, -2, -2, -2, 0, 0, -2, -5,
          -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, -1, 0, -1, -1, -1, -1,
          1, -1, -999, 0, 1, 0, -1, -2, 0, -1, -2, -1, -1, 0, -1, -1,
          0, 0, -999, -999, -1, -1, -1, -1, -2, -999, -2, -2, -999, 0, -2, -2,
          0, 0, -2, 0, -2, 0, 0, 0, -2, -1, -1, 1, 1, 0, 0, -1,
          -1, -1, -1, -1, -1, -1, 0, 0, -1, 0, -1, -1, 0, -999, -1, -1,
          -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
          -2, -999, -999, -999, -999, -999, -1, -1, -2, -2, 0, 0, 0, 0, -1, -1,
          -999, -2, -2, 0, 0, -1, -2, -2, 0, 0, 0, -1, -1, -1, -2];
          // 0xC0-DF == -1 and 0xE0-FF == -2
  
        function sanitizeTTProgram(table, ttContext) {
          var data = table.data;
          var i = 0, j, n, b, funcId, pc, lastEndf = 0, lastDeff = 0;
          var stack = [];
          var callstack = [];
          var functionsCalled = [];
          var tooComplexToFollowFunctions =
            ttContext.tooComplexToFollowFunctions;
          var inFDEF = false, ifLevel = 0, inELSE = 0;
          for (var ii = data.length; i < ii;) {
            var op = data[i++];
            // The TrueType instruction set docs can be found at
            // https://developer.apple.com/fonts/TTRefMan/RM05/Chap5.html
            if (op === 0x40) { // NPUSHB - pushes n bytes
              n = data[i++];
              if (inFDEF || inELSE) {
                i += n;
              } else {
                for (j = 0; j < n; j++) {
                  stack.push(data[i++]);
                }
              }
            } else if (op === 0x41) { // NPUSHW - pushes n words
              n = data[i++];
              if (inFDEF || inELSE) {
                i += n * 2;
              } else {
                for (j = 0; j < n; j++) {
                  b = data[i++];
                  stack.push((b << 8) | data[i++]);
                }
              }
            } else if ((op & 0xF8) === 0xB0) { // PUSHB - pushes bytes
              n = op - 0xB0 + 1;
              if (inFDEF || inELSE) {
                i += n;
              } else {
                for (j = 0; j < n; j++) {
                  stack.push(data[i++]);
                }
              }
            } else if ((op & 0xF8) === 0xB8) { // PUSHW - pushes words
              n = op - 0xB8 + 1;
              if (inFDEF || inELSE) {
                i += n * 2;
              } else {
                for (j = 0; j < n; j++) {
                  b = data[i++];
                  stack.push((b << 8) | data[i++]);
                }
              }
            } else if (op === 0x2B && !tooComplexToFollowFunctions) { // CALL
              if (!inFDEF && !inELSE) {
                // collecting inforamtion about which functions are used
                funcId = stack[stack.length - 1];
                ttContext.functionsUsed[funcId] = true;
                if (funcId in ttContext.functionsStackDeltas) {
                  stack.length += ttContext.functionsStackDeltas[funcId];
                } else if (funcId in ttContext.functionsDefined &&
                           functionsCalled.indexOf(funcId) < 0) {
                  callstack.push({ data, i, stackTop: stack.length - 1, });
                  functionsCalled.push(funcId);
                  pc = ttContext.functionsDefined[funcId];
                  if (!pc) {
                    warn('TT: CALL non-existent function');
                    ttContext.hintsValid = false;
                    return;
                  }
                  data = pc.data;
                  i = pc.i;
                }
              }
            } else if (op === 0x2C && !tooComplexToFollowFunctions) { // FDEF
              if (inFDEF || inELSE) {
                warn('TT: nested FDEFs not allowed');
                tooComplexToFollowFunctions = true;
              }
              inFDEF = true;
              // collecting inforamtion about which functions are defined
              lastDeff = i;
              funcId = stack.pop();
              ttContext.functionsDefined[funcId] = { data, i, };
            } else if (op === 0x2D) { // ENDF - end of function
              if (inFDEF) {
                inFDEF = false;
                lastEndf = i;
              } else {
                pc = callstack.pop();
                if (!pc) {
                  warn('TT: ENDF bad stack');
                  ttContext.hintsValid = false;
                  return;
                }
                funcId = functionsCalled.pop();
                data = pc.data;
                i = pc.i;
                ttContext.functionsStackDeltas[funcId] =
                  stack.length - pc.stackTop;
              }
            } else if (op === 0x89) { // IDEF - instruction definition
              if (inFDEF || inELSE) {
                warn('TT: nested IDEFs not allowed');
                tooComplexToFollowFunctions = true;
              }
              inFDEF = true;
              // recording it as a function to track ENDF
              lastDeff = i;
            } else if (op === 0x58) { // IF
              ++ifLevel;
            } else if (op === 0x1B) { // ELSE
              inELSE = ifLevel;
            } else if (op === 0x59) { // EIF
              if (inELSE === ifLevel) {
                inELSE = 0;
              }
              --ifLevel;
            } else if (op === 0x1C) { // JMPR
              if (!inFDEF && !inELSE) {
                var offset = stack[stack.length - 1];
                // only jumping forward to prevent infinite loop
                if (offset > 0) {
                  i += offset - 1;
                }
              }
            }
            // Adjusting stack not extactly, but just enough to get function id
            if (!inFDEF && !inELSE) {
              var stackDelta = op <= 0x8E ? TTOpsStackDeltas[op] :
                op >= 0xC0 && op <= 0xDF ? -1 : op >= 0xE0 ? -2 : 0;
              if (op >= 0x71 && op <= 0x75) {
                n = stack.pop();
                if (!isNaN(n)) {
                  stackDelta = -n * 2;
                }
              }
              while (stackDelta < 0 && stack.length > 0) {
                stack.pop();
                stackDelta++;
              }
              while (stackDelta > 0) {
                stack.push(NaN); // pushing any number into stack
                stackDelta--;
              }
            }
          }
          ttContext.tooComplexToFollowFunctions = tooComplexToFollowFunctions;
          var content = [data];
          if (i > data.length) {
            content.push(new Uint8Array(i - data.length));
          }
          if (lastDeff > lastEndf) {
            warn('TT: complementing a missing function tail');
            // new function definition started, but not finished
            // complete function by [CLEAR, ENDF]
            content.push(new Uint8Array([0x22, 0x2D]));
          }
          foldTTTable(table, content);
        }
  
        function checkInvalidFunctions(ttContext, maxFunctionDefs) {
          if (ttContext.tooComplexToFollowFunctions) {
            return;
          }
          if (ttContext.functionsDefined.length > maxFunctionDefs) {
            warn('TT: more functions defined than expected');
            ttContext.hintsValid = false;
            return;
          }
          for (var j = 0, jj = ttContext.functionsUsed.length; j < jj; j++) {
            if (j > maxFunctionDefs) {
              warn('TT: invalid function id: ' + j);
              ttContext.hintsValid = false;
              return;
            }
            if (ttContext.functionsUsed[j] && !ttContext.functionsDefined[j]) {
              warn('TT: undefined function: ' + j);
              ttContext.hintsValid = false;
              return;
            }
          }
        }
  
        function foldTTTable(table, content) {
          if (content.length > 1) {
            // concatenating the content items
            var newLength = 0;
            var j, jj;
            for (j = 0, jj = content.length; j < jj; j++) {
              newLength += content[j].length;
            }
            newLength = (newLength + 3) & ~3;
            var result = new Uint8Array(newLength);
            var pos = 0;
            for (j = 0, jj = content.length; j < jj; j++) {
              result.set(content[j], pos);
              pos += content[j].length;
            }
            table.data = result;
            table.length = newLength;
          }
        }
  
        function sanitizeTTPrograms(fpgm, prep, cvt, maxFunctionDefs) {
          var ttContext = {
            functionsDefined: [],
            functionsUsed: [],
            functionsStackDeltas: [],
            tooComplexToFollowFunctions: false,
            hintsValid: true
          };
          if (fpgm) {
            sanitizeTTProgram(fpgm, ttContext);
          }
          if (prep) {
            sanitizeTTProgram(prep, ttContext);
          }
          if (fpgm) {
            checkInvalidFunctions(ttContext, maxFunctionDefs);
          }
          if (cvt && (cvt.length & 1)) {
            var cvtData = new Uint8Array(cvt.length + 1);
            cvtData.set(cvt.data);
            cvt.data = cvtData;
          }
          return ttContext.hintsValid;
        }
  
        // The following steps modify the original font data, making copy
        font = new Stream(new Uint8Array(font.getBytes()));
  
        var VALID_TABLES = ['OS/2', 'cmap', 'head', 'hhea', 'hmtx', 'maxp',
          'name', 'post', 'loca', 'glyf', 'fpgm', 'prep', 'cvt ', 'CFF '];
  
        var header = readOpenTypeHeader(font);
        var numTables = header.numTables;
        var cff, cffFile;
  
        var tables = Object.create(null);
        tables['OS/2'] = null;
        tables['cmap'] = null;
        tables['head'] = null;
        tables['hhea'] = null;
        tables['hmtx'] = null;
        tables['maxp'] = null;
        tables['name'] = null;
        tables['post'] = null;
  
        var table;
        for (var i = 0; i < numTables; i++) {
          table = readTableEntry(font);
          if (VALID_TABLES.indexOf(table.tag) < 0) {
            continue; // skipping table if it's not a required or optional table
          }
          if (table.length === 0) {
            continue; // skipping empty tables
          }
          tables[table.tag] = table;
        }
  
        var isTrueType = !tables['CFF '];
        if (!isTrueType) {
          // OpenType font
          if ((header.version === 'OTTO' && !properties.composite) ||
              !tables['head'] || !tables['hhea'] || !tables['maxp'] ||
              !tables['post']) {
            // no major tables: throwing everything at CFFFont
            cffFile = new Stream(tables['CFF '].data);
            cff = new CFFFont(cffFile, properties);
  
            adjustWidths(properties);
  
            return this.convert(name, cff, properties);
          }
  
          delete tables['glyf'];
          delete tables['loca'];
          delete tables['fpgm'];
          delete tables['prep'];
          delete tables['cvt '];
          this.isOpenType = true;
        } else {
          if (!tables['loca']) {
            error('Required "loca" table is not found');
          }
          if (!tables['glyf']) {
            warn('Required "glyf" table is not found -- trying to recover.');
            // Note: We use `sanitizeGlyphLocations` to add dummy glyf data below.
            tables['glyf'] = {
              tag: 'glyf',
              data: new Uint8Array(0),
            };
          }
          this.isOpenType = false;
        }
  
        if (!tables['maxp']) {
          error('Required "maxp" table is not found');
        }
  
        font.pos = (font.start || 0) + tables['maxp'].offset;
        var version = font.getInt32();
        var numGlyphs = font.getUint16();
        var maxFunctionDefs = 0;
        if (version >= 0x00010000 && tables['maxp'].length >= 22) {
          // maxZones can be invalid
          font.pos += 8;
          var maxZones = font.getUint16();
          if (maxZones > 2) { // reset to 2 if font has invalid maxZones
            tables['maxp'].data[14] = 0;
            tables['maxp'].data[15] = 2;
          }
          font.pos += 4;
          maxFunctionDefs = font.getUint16();
        }
  
        var dupFirstEntry = false;
        if (properties.type === 'CIDFontType2' && properties.toUnicode &&
            properties.toUnicode.get(0) > '\u0000') {
          // oracle's defect (see 3427), duplicating first entry
          dupFirstEntry = true;
          numGlyphs++;
          tables['maxp'].data[4] = numGlyphs >> 8;
          tables['maxp'].data[5] = numGlyphs & 255;
        }
  
        var hintsValid = sanitizeTTPrograms(tables['fpgm'], tables['prep'],
                                            tables['cvt '], maxFunctionDefs);
        if (!hintsValid) {
          delete tables['fpgm'];
          delete tables['prep'];
          delete tables['cvt '];
        }
  
        // Ensure the hmtx table contains the advance width and
        // sidebearings information for numGlyphs in the maxp table
        sanitizeMetrics(font, tables['hhea'], tables['hmtx'], numGlyphs);
  
        if (!tables['head']) {
          error('Required "head" table is not found');
        }
  
        sanitizeHead(tables['head'], numGlyphs,
                     isTrueType ? tables['loca'].length : 0);
  
        var missingGlyphs = Object.create(null);
        if (isTrueType) {
          var isGlyphLocationsLong = int16(tables['head'].data[50],
                                           tables['head'].data[51]);
          missingGlyphs = sanitizeGlyphLocations(tables['loca'], tables['glyf'],
                                                 numGlyphs, isGlyphLocationsLong,
                                                 hintsValid, dupFirstEntry);
        }
  
        if (!tables['hhea']) {
          error('Required "hhea" table is not found');
        }
  
        // Sanitizer reduces the glyph advanceWidth to the maxAdvanceWidth
        // Sometimes it's 0. That needs to be fixed
        if (tables['hhea'].data[10] === 0 && tables['hhea'].data[11] === 0) {
          tables['hhea'].data[10] = 0xFF;
          tables['hhea'].data[11] = 0xFF;
        }
  
        // Extract some more font properties from the OpenType head and
        // hhea tables; yMin and descent value are always negative.
        var metricsOverride = {
          unitsPerEm: int16(tables['head'].data[18], tables['head'].data[19]),
          yMax: int16(tables['head'].data[42], tables['head'].data[43]),
          yMin: signedInt16(tables['head'].data[38], tables['head'].data[39]),
          ascent: int16(tables['hhea'].data[4], tables['hhea'].data[5]),
          descent: signedInt16(tables['hhea'].data[6], tables['hhea'].data[7])
        };
  
        // PDF FontDescriptor metrics lie -- using data from actual font.
        this.ascent = metricsOverride.ascent / metricsOverride.unitsPerEm;
        this.descent = metricsOverride.descent / metricsOverride.unitsPerEm;
  
        // The 'post' table has glyphs names.
        if (tables['post']) {
          var valid = readPostScriptTable(tables['post'], properties, numGlyphs);
          if (!valid) {
            tables['post'] = null;
          }
        }
  
        var charCodeToGlyphId = [], charCode;
        var toUnicode = properties.toUnicode, widths = properties.widths;
        var skipToUnicode = (toUnicode instanceof IdentityToUnicodeMap ||
                             toUnicode.length === 0x10000);
  
        // Helper function to try to skip mapping of empty glyphs.
        // Note: In some cases, just relying on the glyph data doesn't work,
        //       hence we also use a few heuristics to fix various PDF files.
        function hasGlyph(glyphId, charCode, widthCode) {
          if (!missingGlyphs[glyphId]) {
            return true;
          }
          if (!skipToUnicode && charCode >= 0 && toUnicode.has(charCode)) {
            return true;
          }
          if (widths && widthCode >= 0 && isNum(widths[widthCode])) {
            return true;
          }
          return false;
        }
  
        if (properties.composite) {
          var cidToGidMap = properties.cidToGidMap || [];
          var isCidToGidMapEmpty = cidToGidMap.length === 0;
  
          properties.cMap.forEach(function(charCode, cid) {
            assert(cid <= 0xffff, 'Max size of CID is 65,535');
            var glyphId = -1;
            if (isCidToGidMapEmpty) {
              glyphId = cid;
            } else if (cidToGidMap[cid] !== undefined) {
              glyphId = cidToGidMap[cid];
            }
  
            if (glyphId >= 0 && glyphId < numGlyphs &&
                hasGlyph(glyphId, charCode, cid)) {
              charCodeToGlyphId[charCode] = glyphId;
            }
          });
          if (dupFirstEntry && (isCidToGidMapEmpty || !charCodeToGlyphId[0])) {
            // We don't duplicate the first entry in the `charCodeToGlyphId` map
            // if the font has a `CIDToGIDMap` which has already mapped the first
            // entry to a non-zero `glyphId` (fixes issue7544.pdf).
            charCodeToGlyphId[0] = numGlyphs - 1;
          }
        } else {
          // Most of the following logic in this code branch is based on the
          // 9.6.6.4 of the PDF spec.
          var cmapTable = readCmapTable(tables['cmap'], font, this.isSymbolicFont,
                                        properties.hasEncoding);
          var cmapPlatformId = cmapTable.platformId;
          var cmapEncodingId = cmapTable.encodingId;
          var cmapMappings = cmapTable.mappings;
          var cmapMappingsLength = cmapMappings.length;
  
          // The spec seems to imply that if the font is symbolic the encoding
          // should be ignored, this doesn't appear to work for 'preistabelle.pdf'
          // where the the font is symbolic and it has an encoding.
          if (properties.hasEncoding &&
              (cmapPlatformId === 3 && cmapEncodingId === 1 ||
               cmapPlatformId === 1 && cmapEncodingId === 0) ||
              (cmapPlatformId === -1 && cmapEncodingId === -1 && // Temporary hack
               !!getEncoding(properties.baseEncodingName))) {    // Temporary hack
            // When no preferred cmap table was found and |baseEncodingName| is
            // one of the predefined encodings, we seem to obtain a better
            // |charCodeToGlyphId| map from the code below (fixes bug 1057544).
            // TODO: Note that this is a hack which should be removed as soon as
            //       we have proper support for more exotic cmap tables.
  
            var baseEncoding = [];
            if (properties.baseEncodingName === 'MacRomanEncoding' ||
                properties.baseEncodingName === 'WinAnsiEncoding') {
              baseEncoding = getEncoding(properties.baseEncodingName);
            }
            var glyphsUnicodeMap = getGlyphsUnicode();
            for (charCode = 0; charCode < 256; charCode++) {
              var glyphName, standardGlyphName;
              if (this.differences && charCode in this.differences) {
                glyphName = this.differences[charCode];
              } else if (charCode in baseEncoding &&
                         baseEncoding[charCode] !== '') {
                glyphName = baseEncoding[charCode];
              } else {
                glyphName = StandardEncoding[charCode];
              }
              if (!glyphName) {
                continue;
              }
              // Ensure that non-standard glyph names are resolved to valid ones.
              standardGlyphName = recoverGlyphName(glyphName, glyphsUnicodeMap);
  
              var unicodeOrCharCode, isUnicode = false;
              if (cmapPlatformId === 3 && cmapEncodingId === 1) {
                unicodeOrCharCode = glyphsUnicodeMap[standardGlyphName];
                isUnicode = true;
              } else if (cmapPlatformId === 1 && cmapEncodingId === 0) {
                // TODO: the encoding needs to be updated with mac os table.
                unicodeOrCharCode = MacRomanEncoding.indexOf(standardGlyphName);
              }
  
              var found = false;
              for (i = 0; i < cmapMappingsLength; ++i) {
                if (cmapMappings[i].charCode !== unicodeOrCharCode) {
                  continue;
                }
                var code = isUnicode ? charCode : unicodeOrCharCode;
                if (hasGlyph(cmapMappings[i].glyphId, code, -1)) {
                  charCodeToGlyphId[charCode] = cmapMappings[i].glyphId;
                  found = true;
                  break;
                }
              }
              if (!found && properties.glyphNames) {
                // Try to map using the post table.
                var glyphId = properties.glyphNames.indexOf(glyphName);
                // The post table ought to use the same kind of glyph names as the
                // `differences` array, but check the standard ones as a fallback.
                if (glyphId === -1 && standardGlyphName !== glyphName) {
                  glyphId = properties.glyphNames.indexOf(standardGlyphName);
                }
                if (glyphId > 0 && hasGlyph(glyphId, -1, -1)) {
                  charCodeToGlyphId[charCode] = glyphId;
                  found = true;
                }
              }
              if (!found) {
                charCodeToGlyphId[charCode] = 0; // notdef
              }
            }
          } else if (cmapPlatformId === 0 && cmapEncodingId === 0) {
            // Default Unicode semantics, use the charcodes as is.
            for (i = 0; i < cmapMappingsLength; ++i) {
              charCodeToGlyphId[cmapMappings[i].charCode] =
                cmapMappings[i].glyphId;
            }
          } else {
            // For (3, 0) cmap tables:
            // The charcode key being stored in charCodeToGlyphId is the lower
            // byte of the two-byte charcodes of the cmap table since according to
            // the spec: 'each byte from the string shall be prepended with the
            // high byte of the range [of charcodes in the cmap table], to form
            // a two-byte character, which shall be used to select the
            // associated glyph description from the subtable'.
            //
            // For (1, 0) cmap tables:
            // 'single bytes from the string shall be used to look up the
            // associated glyph descriptions from the subtable'. This means
            // charcodes in the cmap will be single bytes, so no-op since
            // glyph.charCode & 0xFF === glyph.charCode
            for (i = 0; i < cmapMappingsLength; ++i) {
              charCode = cmapMappings[i].charCode & 0xFF;
              charCodeToGlyphId[charCode] = cmapMappings[i].glyphId;
            }
          }
        }
  
        if (charCodeToGlyphId.length === 0) {
          // defines at least one glyph
          charCodeToGlyphId[0] = 0;
        }
  
        // Converting glyphs and ids into font's cmap table
        var newMapping = adjustMapping(charCodeToGlyphId, properties);
        this.toFontChar = newMapping.toFontChar;
        tables['cmap'] = {
          tag: 'cmap',
          data: createCmapTable(newMapping.charCodeToGlyphId, numGlyphs)
        };
  
        if (!tables['OS/2'] || !validateOS2Table(tables['OS/2'])) {
          tables['OS/2'] = {
            tag: 'OS/2',
            data: createOS2Table(properties, newMapping.charCodeToGlyphId,
                                 metricsOverride)
          };
        }
  
        // Rewrite the 'post' table if needed
        if (!tables['post']) {
          tables['post'] = {
            tag: 'post',
            data: createPostTable(properties)
          };
        }
  
        if (!isTrueType) {
          try {
            // Trying to repair CFF file
            cffFile = new Stream(tables['CFF '].data);
            var parser = new CFFParser(cffFile, properties,
                                       SEAC_ANALYSIS_ENABLED);
            cff = parser.parse();
            var compiler = new CFFCompiler(cff);
            tables['CFF '].data = compiler.compile();
          } catch (e) {
            warn('Failed to compile font ' + properties.loadedName);
          }
        }
  
        // Re-creating 'name' table
        if (!tables['name']) {
          tables['name'] = {
            tag: 'name',
            data: createNameTable(this.name)
          };
        } else {
          // ... using existing 'name' table as prototype
          var namePrototype = readNameTable(tables['name']);
          tables['name'].data = createNameTable(name, namePrototype);
        }
  
        var builder = new OpenTypeFileBuilder(header.version);
        for (var tableTag in tables) {
          builder.addTable(tableTag, tables[tableTag].data);
        }
        return builder.toArray();
      },
  
      convert: function Font_convert(fontName, font, properties) {
        // TODO: Check the charstring widths to determine this.
        properties.fixedPitch = false;
  
        if (properties.builtInEncoding) {
          // For Type1 fonts that do not include either `ToUnicode` or `Encoding`
          // data, attempt to use the `builtInEncoding` to improve text selection.
          adjustToUnicode(properties, properties.builtInEncoding);
        }
  
        var mapping = font.getGlyphMapping(properties);
        var newMapping = adjustMapping(mapping, properties);
        this.toFontChar = newMapping.toFontChar;
        var numGlyphs = font.numGlyphs;
  
        function getCharCodes(charCodeToGlyphId, glyphId) {
          var charCodes = null;
          for (var charCode in charCodeToGlyphId) {
            if (glyphId === charCodeToGlyphId[charCode]) {
              if (!charCodes) {
                charCodes = [];
              }
              charCodes.push(charCode | 0);
            }
          }
          return charCodes;
        }
  
        function createCharCode(charCodeToGlyphId, glyphId) {
          for (var charCode in charCodeToGlyphId) {
            if (glyphId === charCodeToGlyphId[charCode]) {
              return charCode | 0;
            }
          }
          newMapping.charCodeToGlyphId[newMapping.nextAvailableFontCharCode] =
              glyphId;
          return newMapping.nextAvailableFontCharCode++;
        }
  
        var seacs = font.seacs;
        if (SEAC_ANALYSIS_ENABLED && seacs && seacs.length) {
          var matrix = properties.fontMatrix || FONT_IDENTITY_MATRIX;
          var charset = font.getCharset();
          var seacMap = Object.create(null);
          for (var glyphId in seacs) {
            glyphId |= 0;
            var seac = seacs[glyphId];
            var baseGlyphName = StandardEncoding[seac[2]];
            var accentGlyphName = StandardEncoding[seac[3]];
            var baseGlyphId = charset.indexOf(baseGlyphName);
            var accentGlyphId = charset.indexOf(accentGlyphName);
            if (baseGlyphId < 0 || accentGlyphId < 0) {
              continue;
            }
            var accentOffset = {
              x: seac[0] * matrix[0] + seac[1] * matrix[2] + matrix[4],
              y: seac[0] * matrix[1] + seac[1] * matrix[3] + matrix[5]
            };
  
            var charCodes = getCharCodes(mapping, glyphId);
            if (!charCodes) {
              // There's no point in mapping it if the char code was never mapped
              // to begin with.
              continue;
            }
            for (var i = 0, ii = charCodes.length; i < ii; i++) {
              var charCode = charCodes[i];
              // Find a fontCharCode that maps to the base and accent glyphs.
              // If one doesn't exists, create it.
              var charCodeToGlyphId = newMapping.charCodeToGlyphId;
              var baseFontCharCode = createCharCode(charCodeToGlyphId,
                                                    baseGlyphId);
              var accentFontCharCode = createCharCode(charCodeToGlyphId,
                                                      accentGlyphId);
              seacMap[charCode] = {
                baseFontCharCode,
                accentFontCharCode,
                accentOffset,
              };
            }
          }
          properties.seacMap = seacMap;
        }
  
        var unitsPerEm = 1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0];
  
        var builder = new OpenTypeFileBuilder('\x4F\x54\x54\x4F');
        // PostScript Font Program
        builder.addTable('CFF ', font.data);
        // OS/2 and Windows Specific metrics
        builder.addTable('OS/2', createOS2Table(properties,
                                                newMapping.charCodeToGlyphId));
        // Character to glyphs mapping
        builder.addTable('cmap', createCmapTable(newMapping.charCodeToGlyphId,
                         numGlyphs));
        // Font header
        builder.addTable('head',
              '\x00\x01\x00\x00' + // Version number
              '\x00\x00\x10\x00' + // fontRevision
              '\x00\x00\x00\x00' + // checksumAdjustement
              '\x5F\x0F\x3C\xF5' + // magicNumber
              '\x00\x00' + // Flags
              safeString16(unitsPerEm) + // unitsPerEM
              '\x00\x00\x00\x00\x9e\x0b\x7e\x27' + // creation date
              '\x00\x00\x00\x00\x9e\x0b\x7e\x27' + // modifification date
              '\x00\x00' + // xMin
              safeString16(properties.descent) + // yMin
              '\x0F\xFF' + // xMax
              safeString16(properties.ascent) + // yMax
              string16(properties.italicAngle ? 2 : 0) + // macStyle
              '\x00\x11' + // lowestRecPPEM
              '\x00\x00' + // fontDirectionHint
              '\x00\x00' + // indexToLocFormat
              '\x00\x00');  // glyphDataFormat
  
        // Horizontal header
        builder.addTable('hhea',
              '\x00\x01\x00\x00' + // Version number
              safeString16(properties.ascent) + // Typographic Ascent
              safeString16(properties.descent) + // Typographic Descent
              '\x00\x00' + // Line Gap
              '\xFF\xFF' + // advanceWidthMax
              '\x00\x00' + // minLeftSidebearing
              '\x00\x00' + // minRightSidebearing
              '\x00\x00' + // xMaxExtent
              safeString16(properties.capHeight) + // caretSlopeRise
              safeString16(Math.tan(properties.italicAngle) *
                           properties.xHeight) + // caretSlopeRun
              '\x00\x00' + // caretOffset
              '\x00\x00' + // -reserved-
              '\x00\x00' + // -reserved-
              '\x00\x00' + // -reserved-
              '\x00\x00' + // -reserved-
              '\x00\x00' + // metricDataFormat
              string16(numGlyphs)); // Number of HMetrics
  
        // Horizontal metrics
        builder.addTable('hmtx', (function fontFieldsHmtx() {
            var charstrings = font.charstrings;
            var cffWidths = font.cff ? font.cff.widths : null;
            var hmtx = '\x00\x00\x00\x00'; // Fake .notdef
            for (var i = 1, ii = numGlyphs; i < ii; i++) {
              var width = 0;
              if (charstrings) {
                var charstring = charstrings[i - 1];
                width = 'width' in charstring ? charstring.width : 0;
              } else if (cffWidths) {
                width = Math.ceil(cffWidths[i] || 0);
              }
              hmtx += string16(width) + string16(0);
            }
            return hmtx;
          })());
  
        // Maximum profile
        builder.addTable('maxp',
              '\x00\x00\x50\x00' + // Version number
              string16(numGlyphs)); // Num of glyphs
  
        // Naming tables
        builder.addTable('name', createNameTable(fontName));
  
        // PostScript information
        builder.addTable('post', createPostTable(properties));
  
        return builder.toArray();
      },
  
      get spaceWidth() {
        if ('_shadowWidth' in this) {
          return this._shadowWidth;
        }
  
        // trying to estimate space character width
        var possibleSpaceReplacements = ['space', 'minus', 'one', 'i', 'I'];
        var width;
        for (var i = 0, ii = possibleSpaceReplacements.length; i < ii; i++) {
          var glyphName = possibleSpaceReplacements[i];
          // if possible, getting width by glyph name
          if (glyphName in this.widths) {
            width = this.widths[glyphName];
            break;
          }
          var glyphsUnicodeMap = getGlyphsUnicode();
          var glyphUnicode = glyphsUnicodeMap[glyphName];
          // finding the charcode via unicodeToCID map
          var charcode = 0;
          if (this.composite) {
            if (this.cMap.contains(glyphUnicode)) {
              charcode = this.cMap.lookup(glyphUnicode);
            }
          }
          // ... via toUnicode map
          if (!charcode && this.toUnicode) {
            charcode = this.toUnicode.charCodeOf(glyphUnicode);
          }
          // setting it to unicode if negative or undefined
          if (charcode <= 0) {
            charcode = glyphUnicode;
          }
          // trying to get width via charcode
          width = this.widths[charcode];
          if (width) {
            break; // the non-zero width found
          }
        }
        width = width || this.defaultWidth;
        // Do not shadow the property here. See discussion:
        // https://github.com/mozilla/pdf.js/pull/2127#discussion_r1662280
        this._shadowWidth = width;
        return width;
      },
  
      charToGlyph: function Font_charToGlyph(charcode, isSpace) {
        var fontCharCode, width, operatorListId;
  
        var widthCode = charcode;
        if (this.cMap && this.cMap.contains(charcode)) {
          widthCode = this.cMap.lookup(charcode);
        }
        width = this.widths[widthCode];
        width = isNum(width) ? width : this.defaultWidth;
        var vmetric = this.vmetrics && this.vmetrics[widthCode];
  
        var unicode = this.toUnicode.get(charcode) || charcode;
        if (typeof unicode === 'number') {
          unicode = String.fromCharCode(unicode);
        }
  
        var isInFont = charcode in this.toFontChar;
        // First try the toFontChar map, if it's not there then try falling
        // back to the char code.
        fontCharCode = this.toFontChar[charcode] || charcode;
        if (this.missingFile) {
          fontCharCode = mapSpecialUnicodeValues(fontCharCode);
        }
  
        if (this.isType3Font) {
          // Font char code in this case is actually a glyph name.
          operatorListId = fontCharCode;
        }
  
        var accent = null;
        if (this.seacMap && this.seacMap[charcode]) {
          isInFont = true;
          var seac = this.seacMap[charcode];
          fontCharCode = seac.baseFontCharCode;
          accent = {
            fontChar: String.fromCharCode(seac.accentFontCharCode),
            offset: seac.accentOffset
          };
        }
  
        var fontChar = String.fromCharCode(fontCharCode);
  
        var glyph = this.glyphCache[charcode];
        if (!glyph ||
            !glyph.matchesForCache(fontChar, unicode, accent, width, vmetric,
                                   operatorListId, isSpace, isInFont)) {
          glyph = new Glyph(fontChar, unicode, accent, width, vmetric,
                            operatorListId, isSpace, isInFont);
          this.glyphCache[charcode] = glyph;
        }
        return glyph;
      },
  
      charsToGlyphs: function Font_charsToGlyphs(chars) {
        var charsCache = this.charsCache;
        var glyphs, glyph, charcode;
  
        // if we translated this string before, just grab it from the cache
        if (charsCache) {
          glyphs = charsCache[chars];
          if (glyphs) {
            return glyphs;
          }
        }
  
        // lazily create the translation cache
        if (!charsCache) {
          charsCache = this.charsCache = Object.create(null);
        }
  
        glyphs = [];
        var charsCacheKey = chars;
        var i = 0, ii;
  
        if (this.cMap) {
          // composite fonts have multi-byte strings convert the string from
          // single-byte to multi-byte
          var c = Object.create(null);
          while (i < chars.length) {
            this.cMap.readCharCode(chars, i, c);
            charcode = c.charcode;
            var length = c.length;
            i += length;
            // Space is char with code 0x20 and length 1 in multiple-byte codes.
            var isSpace = length === 1 && chars.charCodeAt(i - 1) === 0x20;
            glyph = this.charToGlyph(charcode, isSpace);
            glyphs.push(glyph);
          }
        } else {
          for (i = 0, ii = chars.length; i < ii; ++i) {
            charcode = chars.charCodeAt(i);
            glyph = this.charToGlyph(charcode, charcode === 0x20);
            glyphs.push(glyph);
          }
        }
  
        // Enter the translated string into the cache
        return (charsCache[charsCacheKey] = glyphs);
      }
    };
  
    return Font;
  })();
  
  var ErrorFont = (function ErrorFontClosure() {
    function ErrorFont(error) {
      this.error = error;
      this.loadedName = 'g_font_error';
      this.loading = false;
    }
  
    ErrorFont.prototype = {
      charsToGlyphs: function ErrorFont_charsToGlyphs() {
        return [];
      },
      exportData: function ErrorFont_exportData() {
        return {error: this.error};
      }
    };
  
    return ErrorFont;
  })();
  
  /**
   * Shared logic for building a char code to glyph id mapping for Type1 and
   * simple CFF fonts. See section 9.6.6.2 of the spec.
   * @param {Object} properties Font properties object.
   * @param {Object} builtInEncoding The encoding contained within the actual font
   * data.
   * @param {Array} glyphNames Array of glyph names where the index is the
   * glyph ID.
   * @returns {Object} A char code to glyph ID map.
   */
  function type1FontGlyphMapping(properties, builtInEncoding, glyphNames) {
    var charCodeToGlyphId = Object.create(null);
    var glyphId, charCode, baseEncoding;
    var isSymbolicFont = !!(properties.flags & FontFlags.Symbolic);
  
    if (properties.baseEncodingName) {
      // If a valid base encoding name was used, the mapping is initialized with
      // that.
      baseEncoding = getEncoding(properties.baseEncodingName);
      for (charCode = 0; charCode < baseEncoding.length; charCode++) {
        glyphId = glyphNames.indexOf(baseEncoding[charCode]);
        if (glyphId >= 0) {
          charCodeToGlyphId[charCode] = glyphId;
        } else {
          charCodeToGlyphId[charCode] = 0; // notdef
        }
      }
    } else if (isSymbolicFont) {
      // For a symbolic font the encoding should be the fonts built-in encoding.
      for (charCode in builtInEncoding) {
        charCodeToGlyphId[charCode] = builtInEncoding[charCode];
      }
    } else {
      // For non-symbolic fonts that don't have a base encoding the standard
      // encoding should be used.
      baseEncoding = StandardEncoding;
      for (charCode = 0; charCode < baseEncoding.length; charCode++) {
        glyphId = glyphNames.indexOf(baseEncoding[charCode]);
        if (glyphId >= 0) {
          charCodeToGlyphId[charCode] = glyphId;
        } else {
          charCodeToGlyphId[charCode] = 0; // notdef
        }
      }
    }
  
    // Lastly, merge in the differences.
    var differences = properties.differences, glyphsUnicodeMap;
    if (differences) {
      for (charCode in differences) {
        var glyphName = differences[charCode];
        glyphId = glyphNames.indexOf(glyphName);
  
        if (glyphId === -1) {
          if (!glyphsUnicodeMap) {
            glyphsUnicodeMap = getGlyphsUnicode();
          }
          var standardGlyphName = recoverGlyphName(glyphName, glyphsUnicodeMap);
          if (standardGlyphName !== glyphName) {
            glyphId = glyphNames.indexOf(standardGlyphName);
          }
        }
        if (glyphId >= 0) {
          charCodeToGlyphId[charCode] = glyphId;
        } else {
          charCodeToGlyphId[charCode] = 0; // notdef
        }
      }
    }
    return charCodeToGlyphId;
  }
  
  // Type1Font is also a CIDFontType0.
  var Type1Font = (function Type1FontClosure() {
    function findBlock(streamBytes, signature, startIndex) {
      var streamBytesLength = streamBytes.length;
      var signatureLength = signature.length;
      var scanLength = streamBytesLength - signatureLength;
  
      var i = startIndex, j, found = false;
      while (i < scanLength) {
        j = 0;
        while (j < signatureLength && streamBytes[i + j] === signature[j]) {
          j++;
        }
        if (j >= signatureLength) { // `signature` found, skip over whitespace.
          i += j;
          while (i < streamBytesLength && isSpace(streamBytes[i])) {
            i++;
          }
          found = true;
          break;
        }
        i++;
      }
      return {
        found,
        length: i,
      };
    }
  
    function getHeaderBlock(stream, suggestedLength) {
      var EEXEC_SIGNATURE = [0x65, 0x65, 0x78, 0x65, 0x63];
  
      var streamStartPos = stream.pos; // Save the initial stream position.
      var headerBytes, headerBytesLength, block;
      try {
        headerBytes = stream.getBytes(suggestedLength);
        headerBytesLength = headerBytes.length;
      } catch (ex) {
        if (ex instanceof MissingDataException) {
          throw ex;
        }
        // Ignore errors if the `suggestedLength` is huge enough that a Uint8Array
        // cannot hold the result of `getBytes`, and fallback to simply checking
        // the entire stream (fixes issue3928.pdf).
      }
  
      if (headerBytesLength === suggestedLength) {
        // Most of the time `suggestedLength` is correct, so to speed things up we
        // initially only check the last few bytes to see if the header was found.
        // Otherwise we (potentially) check the entire stream to prevent errors in
        // `Type1Parser` (fixes issue5686.pdf).
        block = findBlock(headerBytes, EEXEC_SIGNATURE,
                          suggestedLength - 2 * EEXEC_SIGNATURE.length);
  
        if (block.found && block.length === suggestedLength) {
          return {
            stream: new Stream(headerBytes),
            length: suggestedLength,
          };
        }
      }
      warn('Invalid "Length1" property in Type1 font -- trying to recover.');
      stream.pos = streamStartPos; // Reset the stream position.
  
      var SCAN_BLOCK_LENGTH = 2048;
      var actualLength;
      while (true) {
        var scanBytes = stream.peekBytes(SCAN_BLOCK_LENGTH);
        block = findBlock(scanBytes, EEXEC_SIGNATURE, 0);
  
        if (block.length === 0) {
          break;
        }
        stream.pos += block.length; // Update the stream position.
  
        if (block.found) {
          actualLength = stream.pos - streamStartPos;
          break;
        }
      }
      stream.pos = streamStartPos; // Reset the stream position.
  
      if (actualLength) {
        return {
          stream: new Stream(stream.getBytes(actualLength)),
          length: actualLength,
        };
      }
      warn('Unable to recover "Length1" property in Type1 font -- using as is.');
      return {
        stream: new Stream(stream.getBytes(suggestedLength)),
        length: suggestedLength,
      };
    }
  
    function getEexecBlock(stream, suggestedLength) {
      // We should ideally parse the eexec block to ensure that `suggestedLength`
      // is correct, so we don't truncate the block data if it's too small.
      // However, this would also require checking if the fixed-content portion
      // exists (using the 'Length3' property), and ensuring that it's valid.
      //
      // Given that `suggestedLength` almost always is correct, all the validation
      // would require a great deal of unnecessary parsing for most fonts.
      // To save time, we always fetch the entire stream instead, which also avoid
      // issues if `suggestedLength` is huge (see comment in `getHeaderBlock`).
      //
      // NOTE: This means that the function can include the fixed-content portion
      // in the returned eexec block. In practice this does *not* seem to matter,
      // since `Type1Parser_extractFontProgram` will skip over any non-commands.
      var eexecBytes = stream.getBytes();
      return {
        stream: new Stream(eexecBytes),
        length: eexecBytes.length,
      };
    }
  
    function Type1Font(name, file, properties) {
      // Some bad generators embed pfb file as is, we have to strip 6-byte header.
      // Also, length1 and length2 might be off by 6 bytes as well.
      // http://www.math.ubc.ca/~cass/piscript/type1.pdf
      var PFB_HEADER_SIZE = 6;
      var headerBlockLength = properties.length1;
      var eexecBlockLength = properties.length2;
      var pfbHeader = file.peekBytes(PFB_HEADER_SIZE);
      var pfbHeaderPresent = pfbHeader[0] === 0x80 && pfbHeader[1] === 0x01;
      if (pfbHeaderPresent) {
        file.skip(PFB_HEADER_SIZE);
        headerBlockLength = (pfbHeader[5] << 24) | (pfbHeader[4] << 16) |
                            (pfbHeader[3] << 8) | pfbHeader[2];
      }
  
      // Get the data block containing glyphs and subrs information
      var headerBlock = getHeaderBlock(file, headerBlockLength);
      headerBlockLength = headerBlock.length;
      var headerBlockParser = new Type1Parser(headerBlock.stream, false,
                                              SEAC_ANALYSIS_ENABLED);
      headerBlockParser.extractFontHeader(properties);
  
      if (pfbHeaderPresent) {
        pfbHeader = file.getBytes(PFB_HEADER_SIZE);
        eexecBlockLength = (pfbHeader[5] << 24) | (pfbHeader[4] << 16) |
                           (pfbHeader[3] << 8) | pfbHeader[2];
      }
  
      // Decrypt the data blocks and retrieve it's content
      var eexecBlock = getEexecBlock(file, eexecBlockLength);
      eexecBlockLength = eexecBlock.length;
      var eexecBlockParser = new Type1Parser(eexecBlock.stream, true,
                                             SEAC_ANALYSIS_ENABLED);
      var data = eexecBlockParser.extractFontProgram();
      for (var info in data.properties) {
        properties[info] = data.properties[info];
      }
  
      var charstrings = data.charstrings;
      var type2Charstrings = this.getType2Charstrings(charstrings);
      var subrs = this.getType2Subrs(data.subrs);
  
      this.charstrings = charstrings;
      this.data = this.wrap(name, type2Charstrings, this.charstrings,
                            subrs, properties);
      this.seacs = this.getSeacs(data.charstrings);
    }
  
    Type1Font.prototype = {
      get numGlyphs() {
        return this.charstrings.length + 1;
      },
  
      getCharset: function Type1Font_getCharset() {
        var charset = ['.notdef'];
        var charstrings = this.charstrings;
        for (var glyphId = 0; glyphId < charstrings.length; glyphId++) {
          charset.push(charstrings[glyphId].glyphName);
        }
        return charset;
      },
  
      getGlyphMapping: function Type1Font_getGlyphMapping(properties) {
        var charstrings = this.charstrings;
        var glyphNames = ['.notdef'], glyphId;
        for (glyphId = 0; glyphId < charstrings.length; glyphId++) {
          glyphNames.push(charstrings[glyphId].glyphName);
        }
        var encoding = properties.builtInEncoding;
        if (encoding) {
          var builtInEncoding = Object.create(null);
          for (var charCode in encoding) {
            glyphId = glyphNames.indexOf(encoding[charCode]);
            if (glyphId >= 0) {
              builtInEncoding[charCode] = glyphId;
            }
          }
        }
  
        return type1FontGlyphMapping(properties, builtInEncoding, glyphNames);
      },
  
      getSeacs: function Type1Font_getSeacs(charstrings) {
        var i, ii;
        var seacMap = [];
        for (i = 0, ii = charstrings.length; i < ii; i++) {
          var charstring = charstrings[i];
          if (charstring.seac) {
            // Offset by 1 for .notdef
            seacMap[i + 1] = charstring.seac;
          }
        }
        return seacMap;
      },
  
      getType2Charstrings: function Type1Font_getType2Charstrings(
                                      type1Charstrings) {
        var type2Charstrings = [];
        for (var i = 0, ii = type1Charstrings.length; i < ii; i++) {
          type2Charstrings.push(type1Charstrings[i].charstring);
        }
        return type2Charstrings;
      },
  
      getType2Subrs: function Type1Font_getType2Subrs(type1Subrs) {
        var bias = 0;
        var count = type1Subrs.length;
        if (count < 1133) {
          bias = 107;
        } else if (count < 33769) {
          bias = 1131;
        } else {
          bias = 32768;
        }
  
        // Add a bunch of empty subrs to deal with the Type2 bias
        var type2Subrs = [];
        var i;
        for (i = 0; i < bias; i++) {
          type2Subrs.push([0x0B]);
        }
  
        for (i = 0; i < count; i++) {
          type2Subrs.push(type1Subrs[i]);
        }
  
        return type2Subrs;
      },
  
      wrap: function Type1Font_wrap(name, glyphs, charstrings, subrs,
                                    properties) {
        var cff = new CFF();
        cff.header = new CFFHeader(1, 0, 4, 4);
  
        cff.names = [name];
  
        var topDict = new CFFTopDict();
        // CFF strings IDs 0...390 are predefined names, so refering
        // to entries in our own String INDEX starts at SID 391.
        topDict.setByName('version', 391);
        topDict.setByName('Notice', 392);
        topDict.setByName('FullName', 393);
        topDict.setByName('FamilyName', 394);
        topDict.setByName('Weight', 395);
        topDict.setByName('Encoding', null); // placeholder
        topDict.setByName('FontMatrix', properties.fontMatrix);
        topDict.setByName('FontBBox', properties.bbox);
        topDict.setByName('charset', null); // placeholder
        topDict.setByName('CharStrings', null); // placeholder
        topDict.setByName('Private', null); // placeholder
        cff.topDict = topDict;
  
        var strings = new CFFStrings();
        strings.add('Version 0.11'); // Version
        strings.add('See original notice'); // Notice
        strings.add(name); // FullName
        strings.add(name); // FamilyName
        strings.add('Medium'); // Weight
        cff.strings = strings;
  
        cff.globalSubrIndex = new CFFIndex();
  
        var count = glyphs.length;
        var charsetArray = [0];
        var i, ii;
        for (i = 0; i < count; i++) {
          var index = CFFStandardStrings.indexOf(charstrings[i].glyphName);
          // TODO: Insert the string and correctly map it.  Previously it was
          // thought mapping names that aren't in the standard strings to .notdef
          // was fine, however in issue818 when mapping them all to .notdef the
          // adieresis glyph no longer worked.
          if (index === -1) {
            index = 0;
          }
          charsetArray.push((index >> 8) & 0xff, index & 0xff);
        }
        cff.charset = new CFFCharset(false, 0, [], charsetArray);
  
        var charStringsIndex = new CFFIndex();
        charStringsIndex.add([0x8B, 0x0E]); // .notdef
        for (i = 0; i < count; i++) {
          var glyph = glyphs[i];
          // If the CharString outline is empty, replace it with .notdef to
          // prevent OTS from rejecting the font (fixes bug1252420.pdf).
          if (glyph.length === 0) {
            charStringsIndex.add([0x8B, 0x0E]); // .notdef
            continue;
          }
          charStringsIndex.add(glyph);
        }
        cff.charStrings = charStringsIndex;
  
        var privateDict = new CFFPrivateDict();
        privateDict.setByName('Subrs', null); // placeholder
        var fields = [
          'BlueValues',
          'OtherBlues',
          'FamilyBlues',
          'FamilyOtherBlues',
          'StemSnapH',
          'StemSnapV',
          'BlueShift',
          'BlueFuzz',
          'BlueScale',
          'LanguageGroup',
          'ExpansionFactor',
          'ForceBold',
          'StdHW',
          'StdVW'
        ];
        for (i = 0, ii = fields.length; i < ii; i++) {
          var field = fields[i];
          if (!(field in properties.privateData)) {
            continue;
          }
          var value = properties.privateData[field];
          if (isArray(value)) {
            // All of the private dictionary array data in CFF must be stored as
            // "delta-encoded" numbers.
            for (var j = value.length - 1; j > 0; j--) {
              value[j] -= value[j - 1]; // ... difference from previous value
            }
          }
          privateDict.setByName(field, value);
        }
        cff.topDict.privateDict = privateDict;
  
        var subrIndex = new CFFIndex();
        for (i = 0, ii = subrs.length; i < ii; i++) {
          subrIndex.add(subrs[i]);
        }
        privateDict.subrsIndex = subrIndex;
  
        var compiler = new CFFCompiler(cff);
        return compiler.compile();
      }
    };
  
    return Type1Font;
  })();
  
  var CFFFont = (function CFFFontClosure() {
    function CFFFont(file, properties) {
      this.properties = properties;
  
      var parser = new CFFParser(file, properties, SEAC_ANALYSIS_ENABLED);
      this.cff = parser.parse();
      var compiler = new CFFCompiler(this.cff);
      this.seacs = this.cff.seacs;
      try {
        this.data = compiler.compile();
      } catch (e) {
        warn('Failed to compile font ' + properties.loadedName);
        // There may have just been an issue with the compiler, set the data
        // anyway and hope the font loaded.
        this.data = file;
      }
    }
  
    CFFFont.prototype = {
      get numGlyphs() {
        return this.cff.charStrings.count;
      },
      getCharset: function CFFFont_getCharset() {
        return this.cff.charset.charset;
      },
      getGlyphMapping: function CFFFont_getGlyphMapping() {
        var cff = this.cff;
        var properties = this.properties;
        var charsets = cff.charset.charset;
        var charCodeToGlyphId;
        var glyphId;
  
        if (properties.composite) {
          charCodeToGlyphId = Object.create(null);
          if (cff.isCIDFont) {
            // If the font is actually a CID font then we should use the charset
            // to map CIDs to GIDs.
            for (glyphId = 0; glyphId < charsets.length; glyphId++) {
              var cid = charsets[glyphId];
              var charCode = properties.cMap.charCodeOf(cid);
              charCodeToGlyphId[charCode] = glyphId;
            }
          } else {
            // If it is NOT actually a CID font then CIDs should be mapped
            // directly to GIDs.
            for (glyphId = 0; glyphId < cff.charStrings.count; glyphId++) {
              charCodeToGlyphId[glyphId] = glyphId;
            }
          }
          return charCodeToGlyphId;
        }
  
        var encoding = cff.encoding ? cff.encoding.encoding : null;
        charCodeToGlyphId = type1FontGlyphMapping(properties, encoding, charsets);
        return charCodeToGlyphId;
      }
    };
  
    return CFFFont;
  })();
  
  // Workaround for seac on Windows.
  (function checkSeacSupport() {
    if (typeof navigator !== 'undefined' && /Windows/.test(navigator.userAgent)) {
      SEAC_ANALYSIS_ENABLED = true;
    }
  })();
  
  // Workaround for Private Use Area characters in Chrome on Windows
  // http://code.google.com/p/chromium/issues/detail?id=122465
  // https://github.com/mozilla/pdf.js/issues/1689
  (function checkChromeWindows() {
    if (typeof navigator !== 'undefined' &&
        /Windows.*Chrome/.test(navigator.userAgent)) {
      SKIP_PRIVATE_USE_RANGE_F000_TO_F01F = true;
    }
  })();
  
  exports.SEAC_ANALYSIS_ENABLED = SEAC_ANALYSIS_ENABLED;
  exports.PRIVATE_USE_OFFSET_START = PRIVATE_USE_OFFSET_START;
  exports.PRIVATE_USE_OFFSET_END = PRIVATE_USE_OFFSET_END;
  exports.ErrorFont = ErrorFont;
  exports.Font = Font;
  exports.FontFlags = FontFlags;
  exports.IdentityToUnicodeMap = IdentityToUnicodeMap;
  exports.ProblematicCharRanges = ProblematicCharRanges;
  exports.ToUnicodeMap = ToUnicodeMap;
  exports.getFontType = getFontType;
  }));
  