text: /**
   * @licstart The following is the entire license notice for the
   * Javascript code in this page
   *
   * Copyright 2020 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.
   *
   * @licend The above is the entire license notice for the
   * Javascript code in this page
   */
  "use strict";
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.PDFNodeStream = void 0;
  
  var _regenerator = _interopRequireDefault(require("@babel/runtime/regenerator"));
  
  var _util_metapdf = require("../shared/util_metapdf.js");
  
  var _network_utils = require("./network_utils.js");
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
  
  function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
  
  function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
  
  function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
  
  function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
  
  function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
  
  function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
  
  function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
  
  function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
  
  function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
  
  function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
  
  function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
  
  ;
  
  var fs = require("fs");
  
  var http = require("http");
  
  var https = require("https");
  
  var url = require("url");
  
  var fileUriRegex = /^file:\/\/\/[a-zA-Z]:\//;
  
  function parseUrl(sourceUrl) {
    var parsedUrl = url.parse(sourceUrl);
  
    if (parsedUrl.protocol === "file:" || parsedUrl.host) {
      return parsedUrl;
    }
  
    if (/^[a-z]:[/\\]/i.test(sourceUrl)) {
      return url.parse("file:///".concat(sourceUrl));
    }
  
    if (!parsedUrl.host) {
      parsedUrl.protocol = "file:";
    }
  
    return parsedUrl;
  }
  
  var PDFNodeStream = /*#__PURE__*/function () {
    function PDFNodeStream(source) {
      _classCallCheck(this, PDFNodeStream);
  
      this.source = source;
      this.url = parseUrl(source.url);
      this.isHttp = this.url.protocol === "http:" || this.url.protocol === "https:";
      this.isFsUrl = this.url.protocol === "file:";
      this.httpHeaders = this.isHttp && source.httpHeaders || {};
      this._fullRequestReader = null;
      this._rangeRequestReaders = [];
    }
  
    _createClass(PDFNodeStream, [{
      key: "getFullReader",
      value: function getFullReader() {
        (0, _util_metapdf.assert)(!this._fullRequestReader, "PDFNodeStream.getFullReader can only be called once.");
        this._fullRequestReader = this.isFsUrl ? new PDFNodeStreamFsFullReader(this) : new PDFNodeStreamFullReader(this);
        return this._fullRequestReader;
      }
    }, {
      key: "getRangeReader",
      value: function getRangeReader(start, end) {
        if (end <= this._progressiveDataLength) {
          return null;
        }
  
        var rangeReader = this.isFsUrl ? new PDFNodeStreamFsRangeReader(this, start, end) : new PDFNodeStreamRangeReader(this, start, end);
  
        this._rangeRequestReaders.push(rangeReader);
  
        return rangeReader;
      }
    }, {
      key: "cancelAllRequests",
      value: function cancelAllRequests(reason) {
        if (this._fullRequestReader) {
          this._fullRequestReader.cancel(reason);
        }
  
        var readers = this._rangeRequestReaders.slice(0);
  
        readers.forEach(function (reader) {
          reader.cancel(reason);
        });
      }
    }, {
      key: "_progressiveDataLength",
      get: function get() {
        return this._fullRequestReader ? this._fullRequestReader._loaded : 0;
      }
    }]);
  
    return PDFNodeStream;
  }();
  
  exports.PDFNodeStream = PDFNodeStream;
  
  var BaseFullReader = /*#__PURE__*/function () {
    function BaseFullReader(stream) {
      _classCallCheck(this, BaseFullReader);
  
      this._url = stream.url;
      this._done = false;
      this._storedError = null;
      this.onProgress = null;
      var source = stream.source;
      this._contentLength = source.length;
      this._loaded = 0;
      this._filename = null;
      this._disableRange = source.disableRange || false;
      this._rangeChunkSize = source.rangeChunkSize;
  
      if (!this._rangeChunkSize && !this._disableRange) {
        this._disableRange = true;
      }
  
      this._isStreamingSupported = !source.disableStream;
      this._isRangeSupported = !source.disableRange;
      this._readableStream = null;
      this._readCapability = (0, _util_metapdf.createPromiseCapability)();
      this._headersCapability = (0, _util_metapdf.createPromiseCapability)();
    }
  
    _createClass(BaseFullReader, [{
      key: "read",
      value: function () {
        var _read = _asyncToGenerator( /*#__PURE__*/_regenerator["default"].mark(function _callee() {
          var chunk, buffer;
          return _regenerator["default"].wrap(function _callee$(_context) {
            while (1) {
              switch (_context.prev = _context.next) {
                case 0:
                  _context.next = 2;
                  return this._readCapability.promise;
  
                case 2:
                  if (!this._done) {
                    _context.next = 4;
                    break;
                  }
  
                  return _context.abrupt("return", {
                    value: undefined,
                    done: true
                  });
  
                case 4:
                  if (!this._storedError) {
                    _context.next = 6;
                    break;
                  }
  
                  throw this._storedError;
  
                case 6:
                  chunk = this._readableStream.read();
  
                  if (!(chunk === null)) {
                    _context.next = 10;
                    break;
                  }
  
                  this._readCapability = (0, _util_metapdf.createPromiseCapability)();
                  return _context.abrupt("return", this.read());
  
                case 10:
                  this._loaded += chunk.length;
  
                  if (this.onProgress) {
                    this.onProgress({
                      loaded: this._loaded,
                      total: this._contentLength
                    });
                  }
  
                  buffer = new Uint8Array(chunk).buffer;
                  return _context.abrupt("return", {
                    value: buffer,
                    done: false
                  });
  
                case 14:
                case "end":
                  return _context.stop();
              }
            }
          }, _callee, this);
        }));
  
        function read() {
          return _read.apply(this, arguments);
        }
  
        return read;
      }()
    }, {
      key: "cancel",
      value: function cancel(reason) {
        if (!this._readableStream) {
          this._error(reason);
  
          return;
        }
  
        this._readableStream.destroy(reason);
      }
    }, {
      key: "_error",
      value: function _error(reason) {
        this._storedError = reason;
  
        this._readCapability.resolve();
      }
    }, {
      key: "_setReadableStream",
      value: function _setReadableStream(readableStream) {
        var _this = this;
  
        this._readableStream = readableStream;
        readableStream.on("readable", function () {
          _this._readCapability.resolve();
        });
        readableStream.on("end", function () {
          readableStream.destroy();
          _this._done = true;
  
          _this._readCapability.resolve();
        });
        readableStream.on("error", function (reason) {
          _this._error(reason);
        });
  
        if (!this._isStreamingSupported && this._isRangeSupported) {
          this._error(new _util_metapdf.AbortException("streaming is disabled"));
        }
  
        if (this._storedError) {
          this._readableStream.destroy(this._storedError);
        }
      }
    }, {
      key: "headersReady",
      get: function get() {
        return this._headersCapability.promise;
      }
    }, {
      key: "filename",
      get: function get() {
        return this._filename;
      }
    }, {
      key: "contentLength",
      get: function get() {
        return this._contentLength;
      }
    }, {
      key: "isRangeSupported",
      get: function get() {
        return this._isRangeSupported;
      }
    }, {
      key: "isStreamingSupported",
      get: function get() {
        return this._isStreamingSupported;
      }
    }]);
  
    return BaseFullReader;
  }();
  
  var BaseRangeReader = /*#__PURE__*/function () {
    function BaseRangeReader(stream) {
      _classCallCheck(this, BaseRangeReader);
  
      this._url = stream.url;
      this._done = false;
      this._storedError = null;
      this.onProgress = null;
      this._loaded = 0;
      this._readableStream = null;
      this._readCapability = (0, _util_metapdf.createPromiseCapability)();
      var source = stream.source;
      this._isStreamingSupported = !source.disableStream;
    }
  
    _createClass(BaseRangeReader, [{
      key: "read",
      value: function () {
        var _read2 = _asyncToGenerator( /*#__PURE__*/_regenerator["default"].mark(function _callee2() {
          var chunk, buffer;
          return _regenerator["default"].wrap(function _callee2$(_context2) {
            while (1) {
              switch (_context2.prev = _context2.next) {
                case 0:
                  _context2.next = 2;
                  return this._readCapability.promise;
  
                case 2:
                  if (!this._done) {
                    _context2.next = 4;
                    break;
                  }
  
                  return _context2.abrupt("return", {
                    value: undefined,
                    done: true
                  });
  
                case 4:
                  if (!this._storedError) {
                    _context2.next = 6;
                    break;
                  }
  
                  throw this._storedError;
  
                case 6:
                  chunk = this._readableStream.read();
  
                  if (!(chunk === null)) {
                    _context2.next = 10;
                    break;
                  }
  
                  this._readCapability = (0, _util_metapdf.createPromiseCapability)();
                  return _context2.abrupt("return", this.read());
  
                case 10:
                  this._loaded += chunk.length;
  
                  if (this.onProgress) {
                    this.onProgress({
                      loaded: this._loaded
                    });
                  }
  
                  buffer = new Uint8Array(chunk).buffer;
                  return _context2.abrupt("return", {
                    value: buffer,
                    done: false
                  });
  
                case 14:
                case "end":
                  return _context2.stop();
              }
            }
          }, _callee2, this);
        }));
  
        function read() {
          return _read2.apply(this, arguments);
        }
  
        return read;
      }()
    }, {
      key: "cancel",
      value: function cancel(reason) {
        if (!this._readableStream) {
          this._error(reason);
  
          return;
        }
  
        this._readableStream.destroy(reason);
      }
    }, {
      key: "_error",
      value: function _error(reason) {
        this._storedError = reason;
  
        this._readCapability.resolve();
      }
    }, {
      key: "_setReadableStream",
      value: function _setReadableStream(readableStream) {
        var _this2 = this;
  
        this._readableStream = readableStream;
        readableStream.on("readable", function () {
          _this2._readCapability.resolve();
        });
        readableStream.on("end", function () {
          readableStream.destroy();
          _this2._done = true;
  
          _this2._readCapability.resolve();
        });
        readableStream.on("error", function (reason) {
          _this2._error(reason);
        });
  
        if (this._storedError) {
          this._readableStream.destroy(this._storedError);
        }
      }
    }, {
      key: "isStreamingSupported",
      get: function get() {
        return this._isStreamingSupported;
      }
    }]);
  
    return BaseRangeReader;
  }();
  
  function createRequestOptions(parsedUrl, headers) {
    return {
      protocol: parsedUrl.protocol,
      auth: parsedUrl.auth,
      host: parsedUrl.hostname,
      port: parsedUrl.port,
      path: parsedUrl.path,
      method: "GET",
      headers: headers
    };
  }
  
  var PDFNodeStreamFullReader = /*#__PURE__*/function (_BaseFullReader) {
    _inherits(PDFNodeStreamFullReader, _BaseFullReader);
  
    var _super = _createSuper(PDFNodeStreamFullReader);
  
    function PDFNodeStreamFullReader(stream) {
      var _this3;
  
      _classCallCheck(this, PDFNodeStreamFullReader);
  
      _this3 = _super.call(this, stream);
  
      var handleResponse = function handleResponse(response) {
        if (response.statusCode === 404) {
          var error = new _util_metapdf.MissingPDFException("Missing PDF \"".concat(_this3._url, "\"."));
          _this3._storedError = error;
  
          _this3._headersCapability.reject(error);
  
          return;
        }
  
        _this3._headersCapability.resolve();
  
        _this3._setReadableStream(response);
  
        var getResponseHeader = function getResponseHeader(name) {
          return _this3._readableStream.headers[name.toLowerCase()];
        };
  
        var _validateRangeRequest = (0, _network_utils.validateRangeRequestCapabilities)({
          getResponseHeader: getResponseHeader,
          isHttp: stream.isHttp,
          rangeChunkSize: _this3._rangeChunkSize,
          disableRange: _this3._disableRange
        }),
            allowRangeRequests = _validateRangeRequest.allowRangeRequests,
            suggestedLength = _validateRangeRequest.suggestedLength;
  
        _this3._isRangeSupported = allowRangeRequests;
        _this3._contentLength = suggestedLength || _this3._contentLength;
        _this3._filename = (0, _network_utils.extractFilenameFromHeader)(getResponseHeader);
      };
  
      _this3._request = null;
  
      if (_this3._url.protocol === "http:") {
        _this3._request = http.request(createRequestOptions(_this3._url, stream.httpHeaders), handleResponse);
      } else {
        _this3._request = https.request(createRequestOptions(_this3._url, stream.httpHeaders), handleResponse);
      }
  
      _this3._request.on("error", function (reason) {
        _this3._storedError = reason;
  
        _this3._headersCapability.reject(reason);
      });
  
      _this3._request.end();
  
      return _this3;
    }
  
    return PDFNodeStreamFullReader;
  }(BaseFullReader);
  
  var PDFNodeStreamRangeReader = /*#__PURE__*/function (_BaseRangeReader) {
    _inherits(PDFNodeStreamRangeReader, _BaseRangeReader);
  
    var _super2 = _createSuper(PDFNodeStreamRangeReader);
  
    function PDFNodeStreamRangeReader(stream, start, end) {
      var _this4;
  
      _classCallCheck(this, PDFNodeStreamRangeReader);
  
      _this4 = _super2.call(this, stream);
      _this4._httpHeaders = {};
  
      for (var property in stream.httpHeaders) {
        var value = stream.httpHeaders[property];
  
        if (typeof value === "undefined") {
          continue;
        }
  
        _this4._httpHeaders[property] = value;
      }
  
      _this4._httpHeaders.Range = "bytes=".concat(start, "-").concat(end - 1);
  
      var handleResponse = function handleResponse(response) {
        if (response.statusCode === 404) {
          var error = new _util_metapdf.MissingPDFException("Missing PDF \"".concat(_this4._url, "\"."));
          _this4._storedError = error;
          return;
        }
  
        _this4._setReadableStream(response);
      };
  
      _this4._request = null;
  
      if (_this4._url.protocol === "http:") {
        _this4._request = http.request(createRequestOptions(_this4._url, _this4._httpHeaders), handleResponse);
      } else {
        _this4._request = https.request(createRequestOptions(_this4._url, _this4._httpHeaders), handleResponse);
      }
  
      _this4._request.on("error", function (reason) {
        _this4._storedError = reason;
      });
  
      _this4._request.end();
  
      return _this4;
    }
  
    return PDFNodeStreamRangeReader;
  }(BaseRangeReader);
  
  var PDFNodeStreamFsFullReader = /*#__PURE__*/function (_BaseFullReader2) {
    _inherits(PDFNodeStreamFsFullReader, _BaseFullReader2);
  
    var _super3 = _createSuper(PDFNodeStreamFsFullReader);
  
    function PDFNodeStreamFsFullReader(stream) {
      var _this5;
  
      _classCallCheck(this, PDFNodeStreamFsFullReader);
  
      _this5 = _super3.call(this, stream);
      var path = decodeURIComponent(_this5._url.path);
  
      if (fileUriRegex.test(_this5._url.href)) {
        path = path.replace(/^\//, "");
      }
  
      fs.lstat(path, function (error, stat) {
        if (error) {
          if (error.code === "ENOENT") {
            error = new _util_metapdf.MissingPDFException("Missing PDF \"".concat(path, "\"."));
          }
  
          _this5._storedError = error;
  
          _this5._headersCapability.reject(error);
  
          return;
        }
  
        _this5._contentLength = stat.size;
  
        _this5._setReadableStream(fs.createReadStream(path));
  
        _this5._headersCapability.resolve();
      });
      return _this5;
    }
  
    return PDFNodeStreamFsFullReader;
  }(BaseFullReader);
  
  var PDFNodeStreamFsRangeReader = /*#__PURE__*/function (_BaseRangeReader2) {
    _inherits(PDFNodeStreamFsRangeReader, _BaseRangeReader2);
  
    var _super4 = _createSuper(PDFNodeStreamFsRangeReader);
  
    function PDFNodeStreamFsRangeReader(stream, start, end) {
      var _this6;
  
      _classCallCheck(this, PDFNodeStreamFsRangeReader);
  
      _this6 = _super4.call(this, stream);
      var path = decodeURIComponent(_this6._url.path);
  
      if (fileUriRegex.test(_this6._url.href)) {
        path = path.replace(/^\//, "");
      }
  
      _this6._setReadableStream(fs.createReadStream(path, {
        start: start,
        end: end - 1
      }));
  
      return _this6;
    }
  
    return PDFNodeStreamFsRangeReader;
  }(BaseRangeReader);