1.index.js

              resultObj.action = namedAction.name;
            }
            break;
          case 'JavaScript':
            var jsAction = action.get('JS');
            var js = void 0;
            if ((0, _primitives.isStream)(jsAction)) {
              js = (0, _util.bytesToString)(jsAction.getBytes());
            } else if ((0, _util.isString)(jsAction)) {
              js = jsAction;
            }
            if (js) {
              var URL_OPEN_METHODS = ['app.launchURL', 'window.open'];
              var regex = new RegExp('^\\s*(' + URL_OPEN_METHODS.join('|').split('.').join('\\.') + ')\\((?:\'|\")([^\'\"]*)(?:\'|\")(?:,\\s*(\\w+)\\)|\\))', 'i');
              var jsUrl = regex.exec((0, _util.stringToPDFString)(js));
              if (jsUrl && jsUrl[2]) {
                url = jsUrl[2];
                if (jsUrl[3] === 'true' && jsUrl[1] === 'app.launchURL') {
                  resultObj.newWindow = true;
                }
                break;
              }
            }
          default:
            (0, _util.warn)('parseDestDictionary: unsupported action type "' + actionName + '".');
            break;
        }
      } else if (destDict.has('Dest')) {
        dest = destDict.get('Dest');
      }
      if ((0, _util.isString)(url)) {
        url = tryConvertUrlEncoding(url);
        var absoluteUrl = (0, _util.createValidAbsoluteUrl)(url, docBaseUrl);
        if (absoluteUrl) {
          resultObj.url = absoluteUrl.href;
        }
        resultObj.unsafeUrl = url;
      }
      if (dest) {
        if ((0, _primitives.isName)(dest)) {
          dest = dest.name;
        }
        if ((0, _util.isString)(dest) || Array.isArray(dest)) {
          resultObj.dest = dest;
        }
      }
    }
  }]);

  return Catalog;
}();

var XRef = function XRefClosure() {
  function XRef(stream, pdfManager) {
    this.stream = stream;
    this.pdfManager = pdfManager;
    this.entries = [];
    this.xrefstms = Object.create(null);
    this.cache = [];
    this.stats = {
      streamTypes: [],
      fontTypes: []
    };
  }
  XRef.prototype = {
    setStartXRef: function XRef_setStartXRef(startXRef) {
      this.startXRefQueue = [startXRef];
    },
    parse: function XRef_parse(recoveryMode) {
      var trailerDict;
      if (!recoveryMode) {
        trailerDict = this.readXRef();
      } else {
        (0, _util.warn)('Indexing all PDF objects');
        trailerDict = this.indexObjects();
      }
      trailerDict.assignXref(this);
      this.trailer = trailerDict;
      var encrypt = void 0;
      try {
        encrypt = trailerDict.get('Encrypt');
      } catch (ex) {
        if (ex instanceof _util.MissingDataException) {
          throw ex;
        }
        (0, _util.warn)('XRef.parse - Invalid "Encrypt" reference: "' + ex + '".');
      }
      if ((0, _primitives.isDict)(encrypt)) {
        var ids = trailerDict.get('ID');
        var fileId = ids && ids.length ? ids[0] : '';
        encrypt.suppressEncryption = true;
        this.encrypt = new _crypto.CipherTransformFactory(encrypt, fileId, this.pdfManager.password);
      }
      var root = void 0;
      try {
        root = trailerDict.get('Root');
      } catch (ex) {
        if (ex instanceof _util.MissingDataException) {
          throw ex;
        }
        (0, _util.warn)('XRef.parse - Invalid "Root" reference: "' + ex + '".');
      }
      if ((0, _primitives.isDict)(root) && root.has('Pages')) {
        this.root = root;
      } else {
        if (!recoveryMode) {
          throw new _util.XRefParseException();
        }
        throw new _util.FormatError('Invalid root reference');
      }
    },
    processXRefTable: function XRef_processXRefTable(parser) {
      if (!('tableState' in this)) {
        this.tableState = {
          entryNum: 0,
          streamPos: parser.lexer.stream.pos,
          parserBuf1: parser.buf1,
          parserBuf2: parser.buf2
        };
      }
      var obj = this.readXRefTable(parser);
      if (!(0, _primitives.isCmd)(obj, 'trailer')) {
        throw new _util.FormatError('Invalid XRef table: could not find trailer dictionary');
      }
      var dict = parser.getObj();
      if (!(0, _primitives.isDict)(dict) && dict.dict) {
        dict = dict.dict;
      }
      if (!(0, _primitives.isDict)(dict)) {
        throw new _util.FormatError('Invalid XRef table: could not parse trailer dictionary');
      }
      delete this.tableState;
      return dict;
    },
    readXRefTable: function XRef_readXRefTable(parser) {
      var stream = parser.lexer.stream;
      var tableState = this.tableState;
      stream.pos = tableState.streamPos;
      parser.buf1 = tableState.parserBuf1;
      parser.buf2 = tableState.parserBuf2;
      var obj;
      while (true) {
        if (!('firstEntryNum' in tableState) || !('entryCount' in tableState)) {
          if ((0, _primitives.isCmd)(obj = parser.getObj(), 'trailer')) {
            break;
          }
          tableState.firstEntryNum = obj;
          tableState.entryCount = parser.getObj();
        }
        var first = tableState.firstEntryNum;
        var count = tableState.entryCount;
        if (!Number.isInteger(first) || !Number.isInteger(count)) {
          throw new _util.FormatError('Invalid XRef table: wrong types in subsection header');
        }
        for (var i = tableState.entryNum; i < count; i++) {
          tableState.streamPos = stream.pos;
          tableState.entryNum = i;
          tableState.parserBuf1 = parser.buf1;
          tableState.parserBuf2 = parser.buf2;
          var entry = {};
          entry.offset = parser.getObj();
          entry.gen = parser.getObj();
          var type = parser.getObj();
          if ((0, _primitives.isCmd)(type, 'f')) {
            entry.free = true;
          } else if ((0, _primitives.isCmd)(type, 'n')) {
            entry.uncompressed = true;
          }
          if (!Number.isInteger(entry.offset) || !Number.isInteger(entry.gen) || !(entry.free || entry.uncompressed)) {
            throw new _util.FormatError('Invalid entry in XRef subsection: ' + first + ', ' + count);
          }
          if (i === 0 && entry.free && first === 1) {
            first = 0;
          }
          if (!this.entries[i + first]) {
            this.entries[i + first] = entry;
          }
        }
        tableState.entryNum = 0;
        tableState.streamPos = stream.pos;
        tableState.parserBuf1 = parser.buf1;
        tableState.parserBuf2 = parser.buf2;
        delete tableState.firstEntryNum;
        delete tableState.entryCount;
      }
      if (this.entries[0] && !this.entries[0].free) {
        throw new _util.FormatError('Invalid XRef table: unexpected first object');
      }
      return obj;
    },
    processXRefStream: function XRef_processXRefStream(stream) {
      if (!('streamState' in this)) {
        var streamParameters = stream.dict;
        var byteWidths = streamParameters.get('W');
        var range = streamParameters.get('Index');
        if (!range) {
          range = [0, streamParameters.get('Size')];
        }
        this.streamState = {
          entryRanges: range,
          byteWidths: byteWidths,
          entryNum: 0,
          streamPos: stream.pos
        };
      }
      this.readXRefStream(stream);
      delete this.streamState;
      return stream.dict;
    },
    readXRefStream: function XRef_readXRefStream(stream) {
      var i, j;
      var streamState = this.streamState;
      stream.pos = streamState.streamPos;
      var byteWidths = streamState.byteWidths;
      var typeFieldWidth = byteWidths[0];
      var offsetFieldWidth = byteWidths[1];
      var generationFieldWidth = byteWidths[2];
      var entryRanges = streamState.entryRanges;
      while (entryRanges.length > 0) {
        var first = entryRanges[0];
        var n = entryRanges[1];
        if (!Number.isInteger(first) || !Number.isInteger(n)) {
          throw new _util.FormatError('Invalid XRef range fields: ' + first + ', ' + n);
        }
        if (!Number.isInteger(typeFieldWidth) || !Number.isInteger(offsetFieldWidth) || !Number.isInteger(generationFieldWidth)) {
          throw new _util.FormatError('Invalid XRef entry fields length: ' + first + ', ' + n);
        }
        for (i = streamState.entryNum; i < n; ++i) {
          streamState.entryNum = i;
          streamState.streamPos = stream.pos;
          var type = 0,
              offset = 0,
              generation = 0;
          for (j = 0; j < typeFieldWidth; ++j) {
            type = type << 8 | stream.getByte();
          }
          if (typeFieldWidth === 0) {
            type = 1;
          }
          for (j = 0; j < offsetFieldWidth; ++j) {
            offset = offset << 8 | stream.getByte();
          }
          for (j = 0; j < generationFieldWidth; ++j) {
            generation = generation << 8 | stream.getByte();
          }
          var entry = {};
          entry.offset = offset;
          entry.gen = generation;
          switch (type) {
            case 0:
              entry.free = true;
              break;
            case 1:
              entry.uncompressed = true;
              break;
            case 2:
              break;
            default:
              throw new _util.FormatError('Invalid XRef entry type: ' + type);
          }
          if (!this.entries[first + i]) {
            this.entries[first + i] = entry;
          }
        }
        streamState.entryNum = 0;
        streamState.streamPos = stream.pos;
        entryRanges.splice(0, 2);
      }
    },
    indexObjects: function XRef_indexObjects() {
      var TAB = 0x9,
          LF = 0xA,
          CR = 0xD,
          SPACE = 0x20;
      var PERCENT = 0x25,
          LT = 0x3C;
      function readToken(data, offset) {
        var token = '',
            ch = data[offset];
        while (ch !== LF && ch !== CR && ch !== LT) {
          if (++offset >= data.length) {
            break;
          }
          token += String.fromCharCode(ch);
          ch = data[offset];
        }
        return token;
      }
      function skipUntil(data, offset, what) {
        var length = what.length,
            dataLength = data.length;
        var skipped = 0;
        while (offset < dataLength) {
          var i = 0;
          while (i < length && data[offset + i] === what[i]) {
            ++i;
          }
          if (i >= length) {
            break;
          }
          offset++;
          skipped++;
        }
        return skipped;
      }
      var objRegExp = /^(\d+)\s+(\d+)\s+obj\b/;
      var endobjRegExp = /\bendobj[\b\s]$/;
      var nestedObjRegExp = /\s+(\d+\s+\d+\s+obj[\b\s])$/;
      var CHECK_CONTENT_LENGTH = 25;
      var trailerBytes = new Uint8Array([116, 114, 97, 105, 108, 101, 114]);
      var startxrefBytes = new Uint8Array([115, 116, 97, 114, 116, 120, 114, 101, 102]);
      var objBytes = new Uint8Array([111, 98, 106]);
      var xrefBytes = new Uint8Array([47, 88, 82, 101, 102]);
      this.entries.length = 0;
      var stream = this.stream;
      stream.pos = 0;
      var buffer = stream.getBytes();
      var position = stream.start,
          length = buffer.length;
      var trailers = [],
          xrefStms = [];
      while (position < length) {
        var ch = buffer[position];
        if (ch === TAB || ch === LF || ch === CR || ch === SPACE) {
          ++position;
          continue;
        }
        if (ch === PERCENT) {
          do {
            ++position;
            if (position >= length) {
              break;
            }
            ch = buffer[position];
          } while (ch !== LF && ch !== CR);
          continue;
        }
        var token = readToken(buffer, position);
        var m;
        if (token.indexOf('xref') === 0 && (token.length === 4 || /\s/.test(token[4]))) {
          position += skipUntil(buffer, position, trailerBytes);
          trailers.push(position);
          position += skipUntil(buffer, position, startxrefBytes);
        } else if (m = objRegExp.exec(token)) {
          if (typeof this.entries[m[1]] === 'undefined') {
            this.entries[m[1]] = {
              offset: position - stream.start,
              gen: m[2] | 0,
              uncompressed: true
            };
          }
          var contentLength = void 0,
              startPos = position + token.length;
          while (startPos < buffer.length) {
            var endPos = startPos + skipUntil(buffer, startPos, objBytes) + 4;
            contentLength = endPos - position;
            var checkPos = Math.max(endPos - CHECK_CONTENT_LENGTH, startPos);
            var tokenStr = (0, _util.bytesToString)(buffer.subarray(checkPos, endPos));
            if (endobjRegExp.test(tokenStr)) {
              break;
            } else {
              var objToken = nestedObjRegExp.exec(tokenStr);
              if (objToken && objToken[1]) {
                (0, _util.warn)('indexObjects: Found new "obj" inside of another "obj", ' + 'caused by missing "endobj" -- trying to recover.');
                contentLength -= objToken[1].length;
                break;
              }
            }
            startPos = endPos;
          }
          var content = buffer.subarray(position, position + contentLength);
          var xrefTagOffset = skipUntil(content, 0, xrefBytes);
          if (xrefTagOffset < contentLength && content[xrefTagOffset + 5] < 64) {
            xrefStms.push(position - stream.start);
            this.xrefstms[position - stream.start] = 1;
          }
          position += contentLength;
        } else if (token.indexOf('trailer') === 0 && (token.length === 7 || /\s/.test(token[7]))) {
          trailers.push(position);
          position += skipUntil(buffer, position, startxrefBytes);
        } else {
          position += token.length + 1;
        }
      }
      var i, ii;
      for (i = 0, ii = xrefStms.length; i < ii; ++i) {
        this.startXRefQueue.push(xrefStms[i]);
        this.readXRef(true);
      }
      var trailerDict = void 0;
      for (i = 0, ii = trailers.length; i < ii; ++i) {
        stream.pos = trailers[i];
        var parser = new _parser.Parser(new _parser.Lexer(stream), true, this, true);
        var obj = parser.getObj();
        if (!(0, _primitives.isCmd)(obj, 'trailer')) {
          continue;
        }
        var dict = parser.getObj();
        if (!(0, _primitives.isDict)(dict)) {
          continue;
        }
        var rootDict = void 0;
        try {
          rootDict = dict.get('Root');
        } catch (ex) {
          if (ex instanceof _util.MissingDataException) {
            throw ex;
          }
          continue;
        }
        if (!(0, _primitives.isDict)(rootDict) || !rootDict.has('Pages')) {
          continue;
        }
        if (dict.has('ID')) {
          return dict;
        }
        trailerDict = dict;
      }
      if (trailerDict) {
        return trailerDict;
      }
      throw new _util.InvalidPDFException('Invalid PDF structure');
    },
    readXRef: function XRef_readXRef(recoveryMode) {
      var stream = this.stream;
      var startXRefParsedCache = Object.create(null);
      try {
        while (this.startXRefQueue.length) {
          var startXRef = this.startXRefQueue[0];
          if (startXRefParsedCache[startXRef]) {
            (0, _util.warn)('readXRef - skipping XRef table since it was already parsed.');
            this.startXRefQueue.shift();
            continue;
          }
          startXRefParsedCache[startXRef] = true;
          stream.pos = startXRef + stream.start;
          var parser = new _parser.Parser(new _parser.Lexer(stream), true, this);
          var obj = parser.getObj();
          var dict;
          if ((0, _primitives.isCmd)(obj, 'xref')) {
            dict = this.processXRefTable(parser);
            if (!this.topDict) {
              this.topDict = dict;
            }
            obj = dict.get('XRefStm');
            if (Number.isInteger(obj)) {
              var pos = obj;
              if (!(pos in this.xrefstms)) {
                this.xrefstms[pos] = 1;
                this.startXRefQueue.push(pos);
              }
            }
          } else if (Number.isInteger(obj)) {
            if (!Number.isInteger(parser.getObj()) || !(0, _primitives.isCmd)(parser.getObj(), 'obj') || !(0, _primitives.isStream)(obj = parser.getObj())) {
              throw new _util.FormatError('Invalid XRef stream');
            }
            dict = this.processXRefStream(obj);
            if (!this.topDict) {
              this.topDict = dict;
            }
            if (!dict) {
              throw new _util.FormatError('Failed to read XRef stream');
            }
          } else {
            throw new _util.FormatError('Invalid XRef stream header');
          }
          obj = dict.get('Prev');
          if (Number.isInteger(obj)) {
            this.startXRefQueue.push(obj);
          } else if ((0, _primitives.isRef)(obj)) {
            this.startXRefQueue.push(obj.num);
          }
          this.startXRefQueue.shift();
        }
        return this.topDict;
      } catch (e) {
        if (e instanceof _util.MissingDataException) {
          throw e;
        }
        (0, _util.info)('(while reading XRef): ' + e);
      }
      if (recoveryMode) {
        return;
      }
      throw new _util.XRefParseException();
    },
    getEntry: function XRef_getEntry(i) {
      var xrefEntry = this.entries[i];
      if (xrefEntry && !xrefEntry.free && xrefEntry.offset) {
        return xrefEntry;
      }
      return null;
    },
    fetchIfRef: function XRef_fetchIfRef(obj, suppressEncryption) {
      if (!(0, _primitives.isRef)(obj)) {
        return obj;
      }
      return this.fetch(obj, suppressEncryption);
    },
    fetch: function XRef_fetch(ref, suppressEncryption) {
      if (!(0, _primitives.isRef)(ref)) {
        throw new Error('ref object is not a reference');
      }
      var num = ref.num;
      if (num in this.cache) {
        var cacheEntry = this.cache[num];
        if (cacheEntry instanceof _primitives.Dict && !cacheEntry.objId) {
          cacheEntry.objId = ref.toString();
        }
        return cacheEntry;
      }
      var xrefEntry = this.getEntry(num);
      if (xrefEntry === null) {
        return this.cache[num] = null;
      }
      if (xrefEntry.uncompressed) {
        xrefEntry = this.fetchUncompressed(ref, xrefEntry, suppressEncryption);
      } else {
        xrefEntry = this.fetchCompressed(xrefEntry, suppressEncryption);
      }
      if ((0, _primitives.isDict)(xrefEntry)) {
        xrefEntry.objId = ref.toString();
      } else if ((0, _primitives.isStream)(xrefEntry)) {
        xrefEntry.dict.objId = ref.toString();
      }
      return xrefEntry;
    },
    fetchUncompressed: function XRef_fetchUncompressed(ref, xrefEntry, suppressEncryption) {
      var gen = ref.gen;
      var num = ref.num;
      if (xrefEntry.gen !== gen) {
        throw new _util.FormatError('inconsistent generation in XRef');
      }
      var stream = this.stream.makeSubStream(xrefEntry.offset + this.stream.start);
      var parser = new _parser.Parser(new _parser.Lexer(stream), true, this);
      var obj1 = parser.getObj();
      var obj2 = parser.getObj();
      var obj3 = parser.getObj();
      if (!Number.isInteger(obj1)) {
        obj1 = parseInt(obj1, 10);
      }
      if (!Number.isInteger(obj2)) {
        obj2 = parseInt(obj2, 10);
      }
      if (obj1 !== num || obj2 !== gen || !(0, _primitives.isCmd)(obj3)) {
        throw new _util.FormatError('bad XRef entry');
      }
      if (obj3.cmd !== 'obj') {
        if (obj3.cmd.indexOf('obj') === 0) {
          num = parseInt(obj3.cmd.substring(3), 10);
          if (!Number.isNaN(num)) {
            return num;
          }
        }
        throw new _util.FormatError('bad XRef entry');
      }
      if (this.encrypt && !suppressEncryption) {
        xrefEntry = parser.getObj(this.encrypt.createCipherTransform(num, gen));
      } else {
        xrefEntry = parser.getObj();
      }
      if (!(0, _primitives.isStream)(xrefEntry)) {
        this.cache[num] = xrefEntry;
      }
      return xrefEntry;
    },
    fetchCompressed: function XRef_fetchCompressed(xrefEntry, suppressEncryption) {
      var tableOffset = xrefEntry.offset;
      var stream = this.fetch(new _primitives.Ref(tableOffset, 0));
      if (!(0, _primitives.isStream)(stream)) {
        throw new _util.FormatError('bad ObjStm stream');
      }
      var first = stream.dict.get('First');
      var n = stream.dict.get('N');
      if (!Number.isInteger(first) || !Number.isInteger(n)) {
        throw new _util.FormatError('invalid first and n parameters for ObjStm stream');
      }
      var parser = new _parser.Parser(new _parser.Lexer(stream), false, this);
      parser.allowStreams = true;
      var i,
          entries = [],
          num,
          nums = [];
      for (i = 0; i < n; ++i) {
        num = parser.getObj();
        if (!Number.isInteger(num)) {
          throw new _util.FormatError('invalid object number in the ObjStm stream: ' + num);
        }
        nums.push(num);
        var offset = parser.getObj();
        if (!Number.isInteger(offset)) {
          throw new _util.FormatError('invalid object offset in the ObjStm stream: ' + offset);
        }
      }
      for (i = 0; i < n; ++i) {
        entries.push(parser.getObj());
        if ((0, _primitives.isCmd)(parser.buf1, 'endobj')) {
          parser.shift();
        }
        num = nums[i];
        var entry = this.entries[num];
        if (entry && entry.offset === tableOffset && entry.gen === i) {
          this.cache[num] = entries[i];
        }
      }
      xrefEntry = entries[xrefEntry.gen];
      if (xrefEntry === undefined) {
        throw new _util.FormatError('bad XRef entry for compressed object');
      }
      return xrefEntry;
    },
    fetchIfRefAsync: function () {
      var _ref = _asyncToGenerator( /*#__PURE__*/_regenerator2.default.mark(function _callee(obj, suppressEncryption) {
        return _regenerator2.default.wrap(function _callee$(_context) {
          while (1) {
            switch (_context.prev = _context.next) {
              case 0:
                if ((0, _primitives.isRef)(obj)) {
                  _context.next = 2;
                  break;
                }

                return _context.abrupt('return', obj);

              case 2:
                return _context.abrupt('return', this.fetchAsync(obj, suppressEncryption));

              case 3:
              case 'end':
                return _context.stop();
            }
          }
        }, _callee, this);
      }));

      function fetchIfRefAsync(_x, _x2) {
        return _ref.apply(this, arguments);
      }

      return fetchIfRefAsync;
    }(),
    fetchAsync: function () {
      var _ref2 = _asyncToGenerator( /*#__PURE__*/_regenerator2.default.mark(function _callee2(ref, suppressEncryption) {
        return _regenerator2.default.wrap(function _callee2$(_context2) {
          while (1) {
            switch (_context2.prev = _context2.next) {
              case 0:
                _context2.prev = 0;
                return _context2.abrupt('return', this.fetch(ref, suppressEncryption));

              case 4:
                _context2.prev = 4;
                _context2.t0 = _context2['catch'](0);

                if (_context2.t0 instanceof _util.MissingDataException) {
                  _context2.next = 8;
                  break;
                }

                throw _context2.t0;

              case 8:
                _context2.next = 10;
                return this.pdfManager.requestRange(_context2.t0.begin, _context2.t0.end);

              case 10:
                return _context2.abrupt('return', this.fetchAsync(ref, suppressEncryption));

              case 11:
              case 'end':
                return _context2.stop();
            }
          }
        }, _callee2, this, [[0, 4]]);
      }));

      function fetchAsync(_x3, _x4) {
        return _ref2.apply(this, arguments);
      }

      return fetchAsync;
    }(),

    getCatalogObj: function XRef_getCatalogObj() {
      return this.root;
    }
  };
  return XRef;
}();

var NameOrNumberTree = function () {
  function NameOrNumberTree(root, xref, type) {
    _classCallCheck(this, NameOrNumberTree);

    if (this.constructor === NameOrNumberTree) {
      (0, _util.unreachable)('Cannot initialize NameOrNumberTree.');
    }
    this.root = root;
    this.xref = xref;
    this._type = type;
  }

  _createClass(NameOrNumberTree, [{
    key: 'getAll',
    value: function getAll() {
      var dict = Object.create(null);
      if (!this.root) {
        return dict;
      }
      var xref = this.xref;
      var processed = new _primitives.RefSet();
      processed.put(this.root);
      var queue = [this.root];
      while (queue.length > 0) {
        var obj = xref.fetchIfRef(queue.shift());
        if (!(0, _primitives.isDict)(obj)) {
          continue;
        }
        if (obj.has('Kids')) {
          var _kids = obj.get('Kids');
          for (var i = 0, ii = _kids.length; i < ii; i++) {
            var kid = _kids[i];
            if (processed.has(kid)) {
              throw new _util.FormatError('Duplicate entry in "' + this._type + '" tree.');
            }
            queue.push(kid);
            processed.put(kid);
          }
          continue;
        }
        var entries = obj.get(this._type);
        if (Array.isArray(entries)) {
          for (var _i2 = 0, _ii = entries.length; _i2 < _ii; _i2 += 2) {
            dict[xref.fetchIfRef(entries[_i2])] = xref.fetchIfRef(entries[_i2 + 1]);
          }
        }
      }
      return dict;
    }
  }, {
    key: 'get',
    value: function get(key) {
      if (!this.root) {
        return null;
      }
      var xref = this.xref;
      var kidsOrEntries = xref.fetchIfRef(this.root);
      var loopCount = 0;
      var MAX_LEVELS = 10;
      while (kidsOrEntries.has('Kids')) {
        if (++loopCount > MAX_LEVELS) {
          (0, _util.warn)('Search depth limit reached for "' + this._type + '" tree.');
          return null;
        }
        var _kids2 = kidsOrEntries.get('Kids');
        if (!Array.isArray(_kids2)) {
          return null;
        }
        var l = 0,
            r = _kids2.length - 1;
        while (l <= r) {
          var m = l + r >> 1;
          var kid = xref.fetchIfRef(_kids2[m]);
          var limits = kid.get('Limits');
          if (key < xref.fetchIfRef(limits[0])) {
            r = m - 1;
          } else if (key > xref.fetchIfRef(limits[1])) {
            l = m + 1;
          } else {
            kidsOrEntries = xref.fetchIfRef(_kids2[m]);
            break;
          }
        }
        if (l > r) {
          return null;
        }
      }
      var entries = kidsOrEntries.get(this._type);
      if (Array.isArray(entries)) {
        var _l = 0,
            _r = entries.length - 2;
        while (_l <= _r) {
          var _m = _l + _r & ~1;
          var currentKey = xref.fetchIfRef(entries[_m]);
          if (key < currentKey) {
            _r = _m - 2;
          } else if (key > currentKey) {
            _l = _m + 2;
          } else {
            return xref.fetchIfRef(entries[_m + 1]);
          }
        }
      }
      return null;
    }
  }]);

  return NameOrNumberTree;
}();

var NameTree = function (_NameOrNumberTree) {
  _inherits(NameTree, _NameOrNumberTree);

  function NameTree(root, xref) {
    _classCallCheck(this, NameTree);

    return _possibleConstructorReturn(this, (NameTree.__proto__ || Object.getPrototypeOf(NameTree)).call(this, root, xref, 'Names'));
  }

  return NameTree;
}(NameOrNumberTree);

var NumberTree = function (_NameOrNumberTree2) {
  _inherits(NumberTree, _NameOrNumberTree2);

  function NumberTree(root, xref) {
    _classCallCheck(this, NumberTree);

    return _possibleConstructorReturn(this, (NumberTree.__proto__ || Object.getPrototypeOf(NumberTree)).call(this, root, xref, 'Nums'));
  }

  return NumberTree;
}(NameOrNumberTree);

var FileSpec = function FileSpecClosure() {
  function FileSpec(root, xref) {
    if (!root || !(0, _primitives.isDict)(root)) {
      return;
    }
    this.xref = xref;
    this.root = root;
    if (root.has('FS')) {
      this.fs = root.get('FS');
    }
    this.description = root.has('Desc') ? (0, _util.stringToPDFString)(root.get('Desc')) : '';
    if (root.has('RF')) {
      (0, _util.warn)('Related file specifications are not supported');
    }
    this.contentAvailable = true;
    if (!root.has('EF')) {
      this.contentAvailable = false;
      (0, _util.warn)('Non-embedded file specifications are not supported');
    }
  }
  function pickPlatformItem(dict) {
    if (dict.has('UF')) {
      return dict.get('UF');
    } else if (dict.has('F')) {
      return dict.get('F');
    } else if (dict.has('Unix')) {
      return dict.get('Unix');
    } else if (dict.has('Mac')) {
      return dict.get('Mac');
    } else if (dict.has('DOS')) {
      return dict.get('DOS');
    }
    return null;
  }
  FileSpec.prototype = {
    get filename() {
      if (!this._filename && this.root) {
        var filename = pickPlatformItem(this.root) || 'unnamed';
        this._filename = (0, _util.stringToPDFString)(filename).replace(/\\\\/g, '\\').replace(/\\\//g, '/').replace(/\\/g, '/');
      }
      return this._filename;
    },
    get content() {
      if (!this.contentAvailable) {
        return null;
      }
      if (!this.contentRef && this.root) {
        this.contentRef = pickPlatformItem(this.root.get('EF'));
      }
      var content = null;
      if (this.contentRef) {
        var xref = this.xref;
        var fileObj = xref.fetchIfRef(this.contentRef);
        if (fileObj && (0, _primitives.isStream)(fileObj)) {
          content = fileObj.getBytes();
        } else {
          (0, _util.warn)('Embedded file specification points to non-existing/invalid ' + 'content');
        }
      } else {
        (0, _util.warn)('Embedded file specification does not have a content');
      }
      return content;
    },
    get serializable() {
      return {
        filename: this.filename,
        content: this.content
      };
    }
  };
  return FileSpec;
}();
var ObjectLoader = function () {
  function mayHaveChildren(value) {
    return (0, _primitives.isRef)(value) || (0, _primitives.isDict)(value) || Array.isArray(value) || (0, _primitives.isStream)(value);
  }
  function addChildren(node, nodesToVisit) {
    if ((0, _primitives.isDict)(node) || (0, _primitives.isStream)(node)) {
      var dict = (0, _primitives.isDict)(node) ? node : node.dict;
      var dictKeys = dict.getKeys();
      for (var i = 0, ii = dictKeys.length; i < ii; i++) {
        var rawValue = dict.getRaw(dictKeys[i]);
        if (mayHaveChildren(rawValue)) {
          nodesToVisit.push(rawValue);
        }
      }
    } else if (Array.isArray(node)) {
      for (var _i3 = 0, _ii2 = node.length; _i3 < _ii2; _i3++) {
        var value = node[_i3];
        if (mayHaveChildren(value)) {
          nodesToVisit.push(value);
        }
      }
    }
  }
  function ObjectLoader(dict, keys, xref) {
    this.dict = dict;
    this.keys = keys;
    this.xref = xref;
    this.refSet = null;
    this.capability = null;
  }
  ObjectLoader.prototype = {
    load: function load() {
      this.capability = (0, _util.createPromiseCapability)();
      if (!(this.xref.stream instanceof _chunked_stream.ChunkedStream) || this.xref.stream.getMissingChunks().length === 0) {
        this.capability.resolve();
        return this.capability.promise;
      }
      var keys = this.keys,
          dict = this.dict;

      this.refSet = new _primitives.RefSet();
      var nodesToVisit = [];
      for (var i = 0, ii = keys.length; i < ii; i++) {
        var rawValue = dict.getRaw(keys[i]);
        if (rawValue !== undefined) {
          nodesToVisit.push(rawValue);
        }
      }
      this._walk(nodesToVisit);
      return this.capability.promise;
    },
    _walk: function _walk(nodesToVisit) {
      var _this4 = this;

      var nodesToRevisit = [];
      var pendingRequests = [];
      while (nodesToVisit.length) {
        var _currentNode = nodesToVisit.pop();
        if ((0, _primitives.isRef)(_currentNode)) {
          if (this.refSet.has(_currentNode)) {
            continue;
          }
          try {
            this.refSet.put(_currentNode);
            _currentNode = this.xref.fetch(_currentNode);
          } catch (ex) {
            if (!(ex instanceof _util.MissingDataException)) {
              throw ex;
            }
            nodesToRevisit.push(_currentNode);
            pendingRequests.push({
              begin: ex.begin,
              end: ex.end
            });
          }
        }
        if (_currentNode && _currentNode.getBaseStreams) {
          var baseStreams = _currentNode.getBaseStreams();
          var foundMissingData = false;
          for (var i = 0, ii = baseStreams.length; i < ii; i++) {
            var stream = baseStreams[i];
            if (stream.getMissingChunks && stream.getMissingChunks().length) {
              foundMissingData = true;
              pendingRequests.push({
                begin: stream.start,
                end: stream.end
              });
            }
          }
          if (foundMissingData) {
            nodesToRevisit.push(_currentNode);
          }
        }
        addChildren(_currentNode, nodesToVisit);
      }
      if (pendingRequests.length) {
        this.xref.stream.manager.requestRanges(pendingRequests).then(function () {
          for (var _i4 = 0, _ii3 = nodesToRevisit.length; _i4 < _ii3; _i4++) {
            var node = nodesToRevisit[_i4];
            if ((0, _primitives.isRef)(node)) {
              _this4.refSet.remove(node);
            }
          }
          _this4._walk(nodesToRevisit);