text: 'use strict';
  var utils = require('./utils');
  var support = require('./support');
  // private property
  var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
  
  
  // public method for encoding
  exports.encode = function(input) {
      var output = [];
      var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
      var i = 0, len = input.length, remainingBytes = len;
  
      var isArray = utils.getTypeOf(input) !== "string";
      while (i < input.length) {
          remainingBytes = len - i;
  
          if (!isArray) {
              chr1 = input.charCodeAt(i++);
              chr2 = i < len ? input.charCodeAt(i++) : 0;
              chr3 = i < len ? input.charCodeAt(i++) : 0;
          } else {
              chr1 = input[i++];
              chr2 = i < len ? input[i++] : 0;
              chr3 = i < len ? input[i++] : 0;
          }
  
          enc1 = chr1 >> 2;
          enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
          enc3 = remainingBytes > 1 ? (((chr2 & 15) << 2) | (chr3 >> 6)) : 64;
          enc4 = remainingBytes > 2 ? (chr3 & 63) : 64;
  
          output.push(_keyStr.charAt(enc1) + _keyStr.charAt(enc2) + _keyStr.charAt(enc3) + _keyStr.charAt(enc4));
  
      }
  
      return output.join("");
  };
  
  // public method for decoding
  exports.decode = function(input) {
      var chr1, chr2, chr3;
      var enc1, enc2, enc3, enc4;
      var i = 0, resultIndex = 0;
  
      var dataUrlPrefix = "data:";
  
      if (input.substr(0, dataUrlPrefix.length) === dataUrlPrefix) {
          // This is a common error: people give a data url
          // (data:image/png;base64,iVBOR...) with a {base64: true} and
          // wonders why things don't work.
          // We can detect that the string input looks like a data url but we
          // *can't* be sure it is one: removing everything up to the comma would
          // be too dangerous.
          throw new Error("Invalid base64 input, it looks like a data url.");
      }
  
      input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  
      var totalLength = input.length * 3 / 4;
      if(input.charAt(input.length - 1) === _keyStr.charAt(64)) {
          totalLength--;
      }
      if(input.charAt(input.length - 2) === _keyStr.charAt(64)) {
          totalLength--;
      }
      if (totalLength % 1 !== 0) {
          // totalLength is not an integer, the length does not match a valid
          // base64 content. That can happen if:
          // - the input is not a base64 content
          // - the input is *almost* a base64 content, with a extra chars at the
          //   beginning or at the end
          // - the input uses a base64 variant (base64url for example)
          throw new Error("Invalid base64 input, bad content length.");
      }
      var output;
      if (support.uint8array) {
          output = new Uint8Array(totalLength|0);
      } else {
          output = new Array(totalLength|0);
      }
  
      while (i < input.length) {
  
          enc1 = _keyStr.indexOf(input.charAt(i++));
          enc2 = _keyStr.indexOf(input.charAt(i++));
          enc3 = _keyStr.indexOf(input.charAt(i++));
          enc4 = _keyStr.indexOf(input.charAt(i++));
  
          chr1 = (enc1 << 2) | (enc2 >> 4);
          chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
          chr3 = ((enc3 & 3) << 6) | enc4;
  
          output[resultIndex++] = chr1;
  
          if (enc3 !== 64) {
              output[resultIndex++] = chr2;
          }
          if (enc4 !== 64) {
              output[resultIndex++] = chr3;
          }
  
      }
  
      return output;
  };
  'use strict';
  
  var external = require("./external");
  var DataWorker = require('./stream/DataWorker');
  var DataLengthProbe = require('./stream/DataLengthProbe');
  var Crc32Probe = require('./stream/Crc32Probe');
  var DataLengthProbe = require('./stream/DataLengthProbe');
  
  /**
   * Represent a compressed object, with everything needed to decompress it.
   * @constructor
   * @param {number} compressedSize the size of the data compressed.
   * @param {number} uncompressedSize the size of the data after decompression.
   * @param {number} crc32 the crc32 of the decompressed file.
   * @param {object} compression the type of compression, see lib/compressions.js.
   * @param {String|ArrayBuffer|Uint8Array|Buffer} data the compressed data.
   */
  function CompressedObject(compressedSize, uncompressedSize, crc32, compression, data) {
      this.compressedSize = compressedSize;
      this.uncompressedSize = uncompressedSize;
      this.crc32 = crc32;
      this.compression = compression;
      this.compressedContent = data;
  }
  
  CompressedObject.prototype = {
      /**
       * Create a worker to get the uncompressed content.
       * @return {GenericWorker} the worker.
       */
      getContentWorker : function () {
          var worker = new DataWorker(external.Promise.resolve(this.compressedContent))
          .pipe(this.compression.uncompressWorker())
          .pipe(new DataLengthProbe("data_length"));
  
          var that = this;
          worker.on("end", function () {
              if(this.streamInfo['data_length'] !== that.uncompressedSize) {
                  throw new Error("Bug : uncompressed data size mismatch");
              }
          });
          return worker;
      },
      /**
       * Create a worker to get the compressed content.
       * @return {GenericWorker} the worker.
       */
      getCompressedWorker : function () {
          return new DataWorker(external.Promise.resolve(this.compressedContent))
          .withStreamInfo("compressedSize", this.compressedSize)
          .withStreamInfo("uncompressedSize", this.uncompressedSize)
          .withStreamInfo("crc32", this.crc32)
          .withStreamInfo("compression", this.compression)
          ;
      }
  };
  
  /**
   * Chain the given worker with other workers to compress the content with the
   * given compresion.
   * @param {GenericWorker} uncompressedWorker the worker to pipe.
   * @param {Object} compression the compression object.
   * @param {Object} compressionOptions the options to use when compressing.
   * @return {GenericWorker} the new worker compressing the content.
   */
  CompressedObject.createWorkerFrom = function (uncompressedWorker, compression, compressionOptions) {
      return uncompressedWorker
      .pipe(new Crc32Probe())
      .pipe(new DataLengthProbe("uncompressedSize"))
      .pipe(compression.compressWorker(compressionOptions))
      .pipe(new DataLengthProbe("compressedSize"))
      .withStreamInfo("compression", compression);
  };
  
  module.exports = CompressedObject;
  'use strict';
  
  var GenericWorker = require("./stream/GenericWorker");
  
  exports.STORE = {
      magic: "\x00\x00",
      compressWorker : function (compressionOptions) {
          return new GenericWorker("STORE compression");
      },
      uncompressWorker : function () {
          return new GenericWorker("STORE decompression");
      }
  };
  exports.DEFLATE = require('./flate');
  'use strict';
  
  var utils = require('./utils');
  
  /**
   * The following functions come from pako, from pako/lib/zlib/crc32.js
   * released under the MIT license, see pako https://github.com/nodeca/pako/
   */
  
  // Use ordinary array, since untyped makes no boost here
  function makeTable() {
      var c, table = [];
  
      for(var n =0; n < 256; n++){
          c = n;
          for(var k =0; k < 8; k++){
              c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
          }
          table[n] = c;
      }
  
      return table;
  }
  
  // Create table on load. Just 255 signed longs. Not a problem.
  var crcTable = makeTable();
  
  
  function crc32(crc, buf, len, pos) {
      var t = crcTable, end = pos + len;
  
      crc = crc ^ (-1);
  
      for (var i = pos; i < end; i++ ) {
          crc = (crc >>> 8) ^ t[(crc ^ buf[i]) & 0xFF];
      }
  
      return (crc ^ (-1)); // >>> 0;
  }
  
  // That's all for the pako functions.
  
  /**
   * Compute the crc32 of a string.
   * This is almost the same as the function crc32, but for strings. Using the
   * same function for the two use cases leads to horrible performances.
   * @param {Number} crc the starting value of the crc.
   * @param {String} str the string to use.
   * @param {Number} len the length of the string.
   * @param {Number} pos the starting position for the crc32 computation.
   * @return {Number} the computed crc32.
   */
  function crc32str(crc, str, len, pos) {
      var t = crcTable, end = pos + len;
  
      crc = crc ^ (-1);
  
      for (var i = pos; i < end; i++ ) {
          crc = (crc >>> 8) ^ t[(crc ^ str.charCodeAt(i)) & 0xFF];
      }
  
      return (crc ^ (-1)); // >>> 0;
  }
  
  module.exports = function crc32wrapper(input, crc) {
      if (typeof input === "undefined" || !input.length) {
          return 0;
      }
  
      var isArray = utils.getTypeOf(input) !== "string";
  
      if(isArray) {
          return crc32(crc|0, input, input.length, 0);
      } else {
          return crc32str(crc|0, input, input.length, 0);
      }
  };
  // vim: set shiftwidth=4 softtabstop=4:
  'use strict';
  exports.base64 = false;
  exports.binary = false;
  exports.dir = false;
  exports.createFolders = true;
  exports.date = null;
  exports.compression = null;
  exports.compressionOptions = null;
  exports.comment = null;
  exports.unixPermissions = null;
  exports.dosPermissions = null;
  /* global Promise */
  'use strict';
  
  // load the global object first:
  // - it should be better integrated in the system (unhandledRejection in node)
  // - the environment may have a custom Promise implementation (see zone.js)
  var ES6Promise = null;
  if (typeof Promise !== "undefined") {
      ES6Promise = Promise;
  } else {
      ES6Promise = require("lie");
  }
  
  /**
   * Let the user use/change some implementations.
   */
  module.exports = {
      Promise: ES6Promise
  };
  'use strict';
  var USE_TYPEDARRAY = (typeof Uint8Array !== 'undefined') && (typeof Uint16Array !== 'undefined') && (typeof Uint32Array !== 'undefined');
  
  var pako = require("pako");
  var utils = require("./utils");
  var GenericWorker = require("./stream/GenericWorker");
  
  var ARRAY_TYPE = USE_TYPEDARRAY ? "uint8array" : "array";
  
  exports.magic = "\x08\x00";
  
  /**
   * Create a worker that uses pako to inflate/deflate.
   * @constructor
   * @param {String} action the name of the pako function to call : either "Deflate" or "Inflate".
   * @param {Object} options the options to use when (de)compressing.
   */
  function FlateWorker(action, options) {
      GenericWorker.call(this, "FlateWorker/" + action);
  
      this._pako = new pako[action]({
          raw:true,
          level : options.level || -1 // default compression
      });
      // the `meta` object from the last chunk received
      // this allow this worker to pass around metadata
      this.meta = {};
  
      var self = this;
      this._pako.onData = function(data) {
          self.push({
              data : data,
              meta : self.meta
          });
      };
  }
  
  utils.inherits(FlateWorker, GenericWorker);
  
  /**
   * @see GenericWorker.processChunk
   */
  FlateWorker.prototype.processChunk = function (chunk) {
      this.meta = chunk.meta;
      this._pako.push(utils.transformTo(ARRAY_TYPE, chunk.data), false);
  };
  
  /**
   * @see GenericWorker.flush
   */
  FlateWorker.prototype.flush = function () {
      GenericWorker.prototype.flush.call(this);
      this._pako.push([], true);
  };
  /**
   * @see GenericWorker.cleanUp
   */
  FlateWorker.prototype.cleanUp = function () {
      GenericWorker.prototype.cleanUp.call(this);
      this._pako = null;
  };
  
  exports.compressWorker = function (compressionOptions) {
      return new FlateWorker("Deflate", compressionOptions);
  };
  exports.uncompressWorker = function () {
      return new FlateWorker("Inflate", {});
  };
  'use strict';
  
  /**
   * Representation a of zip file in js
   * @constructor
   */
  function JSZip() {
      // if this constructor is used without `new`, it adds `new` before itself:
      if(!(this instanceof JSZip)) {
          return new JSZip();
      }
  
      if(arguments.length) {
          throw new Error("The constructor with parameters has been removed in JSZip 3.0, please check the upgrade guide.");
      }
  
      // object containing the files :
      // {
      //   "folder/" : {...},
      //   "folder/data.txt" : {...}
      // }
      this.files = {};
  
      this.comment = null;
  
      // Where we are in the hierarchy
      this.root = "";
      this.clone = function() {
          var newObj = new JSZip();
          for (var i in this) {
              if (typeof this[i] !== "function") {
                  newObj[i] = this[i];
              }
          }
          return newObj;
      };
  }
  JSZip.prototype = require('./object');
  JSZip.prototype.loadAsync = require('./load');
  JSZip.support = require('./support');
  JSZip.defaults = require('./defaults');
  
  // TODO find a better way to handle this version,
  // a require('package.json').version doesn't work with webpack, see #327
  JSZip.version = "3.1.3";
  
  JSZip.loadAsync = function (content, options) {
      return new JSZip().loadAsync(content, options);
  };
  
  JSZip.external = require("./external");
  module.exports = JSZip;
  /*!
  
  JSZip v__VERSION__ - A Javascript class for generating and reading zip files
  <http://stuartk.com/jszip>
  
  (c) 2009-2016 Stuart Knightley <stuart [at] stuartk.com>
  Dual licenced under the MIT license or GPLv3. See https://raw.github.com/Stuk/jszip/master/LICENSE.markdown.
  
  JSZip uses the library pako released under the MIT license :
  https://github.com/nodeca/pako/blob/master/LICENSE
  */
  'use strict';
  var utils = require('./utils');
  var external = require("./external");
  var utf8 = require('./utf8');
  var utils = require('./utils');
  var ZipEntries = require('./zipEntries');
  var Crc32Probe = require('./stream/Crc32Probe');
  var nodejsUtils = require("./nodejsUtils");
  
  /**
   * Check the CRC32 of an entry.
   * @param {ZipEntry} zipEntry the zip entry to check.
   * @return {Promise} the result.
   */
  function checkEntryCRC32(zipEntry) {
      return new external.Promise(function (resolve, reject) {
          var worker = zipEntry.decompressed.getContentWorker().pipe(new Crc32Probe());
          worker.on("error", function (e) {
              reject(e);
          })
          .on("end", function () {
              if (worker.streamInfo.crc32 !== zipEntry.decompressed.crc32) {
                  reject(new Error("Corrupted zip : CRC32 mismatch"));
              } else {
                  resolve();
              }
          })
          .resume();
      });
  }
  
  module.exports = function(data, options) {
      var zip = this;
      options = utils.extend(options || {}, {
          base64: false,
          checkCRC32: false,
          optimizedBinaryString: false,
          createFolders: false,
          decodeFileName: utf8.utf8decode
      });
  
      if (nodejsUtils.isNode && nodejsUtils.isStream(data)) {
          return external.Promise.reject(new Error("JSZip can't accept a stream when loading a zip file."));
      }
  
      return utils.prepareContent("the loaded zip file", data, true, options.optimizedBinaryString, options.base64)
      .then(function(data) {
          var zipEntries = new ZipEntries(options);
          zipEntries.load(data);
          return zipEntries;
      }).then(function checkCRC32(zipEntries) {
          var promises = [external.Promise.resolve(zipEntries)];
          var files = zipEntries.files;
          if (options.checkCRC32) {
              for (var i = 0; i < files.length; i++) {
                  promises.push(checkEntryCRC32(files[i]));
              }
          }
          return external.Promise.all(promises);
      }).then(function addFiles(results) {
          var zipEntries = results.shift();
          var files = zipEntries.files;
          for (var i = 0; i < files.length; i++) {
              var input = files[i];
              zip.file(input.fileNameStr, input.decompressed, {
                  binary: true,
                  optimizedBinaryString: true,
                  date: input.date,
                  dir: input.dir,
                  comment : input.fileCommentStr.length ? input.fileCommentStr : null,
                  unixPermissions : input.unixPermissions,
                  dosPermissions : input.dosPermissions,
                  createFolders: options.createFolders
              });
          }
          if (zipEntries.zipComment.length) {
              zip.comment = zipEntries.zipComment;
          }
  
          return zip;
      });
  };
  'use strict';
  
  module.exports = {
      /**
       * True if this is running in Nodejs, will be undefined in a browser.
       * In a browser, browserify won't include this file and the whole module
       * will be resolved an empty object.
       */
      isNode : typeof Buffer !== "undefined",
      /**
       * Create a new nodejs Buffer.
       * @param {Object} data the data to pass to the constructor.
       * @param {String} encoding the encoding to use.
       * @return {Buffer} a new Buffer.
       */
      newBuffer : function(data, encoding){
          return new Buffer(data, encoding);
      },
      /**
       * Find out if an object is a Buffer.
       * @param {Object} b the object to test.
       * @return {Boolean} true if the object is a Buffer, false otherwise.
       */
      isBuffer : function(b){
          return Buffer.isBuffer(b);
      },
  
      isStream : function (obj) {
          return obj &&
              typeof obj.on === "function" &&
              typeof obj.pause === "function" &&
              typeof obj.resume === "function";
      }
  };
  'use strict';
  var utf8 = require('./utf8');
  var utils = require('./utils');
  var GenericWorker = require('./stream/GenericWorker');
  var StreamHelper = require('./stream/StreamHelper');
  var defaults = require('./defaults');
  var CompressedObject = require('./compressedObject');
  var ZipObject = require('./zipObject');
  var generate = require("./generate");
  var nodejsUtils = require("./nodejsUtils");
  var NodejsStreamInputAdapter = require("./nodejs/NodejsStreamInputAdapter");
  
  
  /**
   * Add a file in the current folder.
   * @private
   * @param {string} name the name of the file
   * @param {String|ArrayBuffer|Uint8Array|Buffer} data the data of the file
   * @param {Object} originalOptions the options of the file
   * @return {Object} the new file.
   */
  var fileAdd = function(name, data, originalOptions) {
      // be sure sub folders exist
      var dataType = utils.getTypeOf(data),
          parent;
  
  
      /*
       * Correct options.
       */
  
      var o = utils.extend(originalOptions || {}, defaults);
      o.date = o.date || new Date();
      if (o.compression !== null) {
          o.compression = o.compression.toUpperCase();
      }
  
      if (typeof o.unixPermissions === "string") {
          o.unixPermissions = parseInt(o.unixPermissions, 8);
      }
  
      // UNX_IFDIR  0040000 see zipinfo.c
      if (o.unixPermissions && (o.unixPermissions & 0x4000)) {
          o.dir = true;
      }
      // Bit 4    Directory
      if (o.dosPermissions && (o.dosPermissions & 0x0010)) {
          o.dir = true;
      }
  
      if (o.dir) {
          name = forceTrailingSlash(name);
      }
      if (o.createFolders && (parent = parentFolder(name))) {
          folderAdd.call(this, parent, true);
      }
  
      var isUnicodeString = dataType === "string" && o.binary === false && o.base64 === false;
      if (!originalOptions || typeof originalOptions.binary === "undefined") {
          o.binary = !isUnicodeString;
      }
  
  
      var isCompressedEmpty = (data instanceof CompressedObject) && data.uncompressedSize === 0;
  
      if (isCompressedEmpty || o.dir || !data || data.length === 0) {
          o.base64 = false;
          o.binary = true;
          data = "";
          o.compression = "STORE";
          dataType = "string";
      }
  
      /*
       * Convert content to fit.
       */
  
      var zipObjectContent = null;
      if (data instanceof CompressedObject || data instanceof GenericWorker) {
          zipObjectContent = data;
      } else if (nodejsUtils.isNode && nodejsUtils.isStream(data)) {
          zipObjectContent = new NodejsStreamInputAdapter(name, data);
      } else {
          zipObjectContent = utils.prepareContent(name, data, o.binary, o.optimizedBinaryString, o.base64);
      }
  
      var object = new ZipObject(name, zipObjectContent, o);
      this.files[name] = object;
      /*
      TODO: we can't throw an exception because we have async promises
      (we can have a promise of a Date() for example) but returning a
      promise is useless because file(name, data) returns the JSZip
      object for chaining. Should we break that to allow the user
      to catch the error ?
  
      return external.Promise.resolve(zipObjectContent)
      .then(function () {
          return object;
      });
      */
  };
  
  /**
   * Find the parent folder of the path.
   * @private
   * @param {string} path the path to use
   * @return {string} the parent folder, or ""
   */
  var parentFolder = function (path) {
      if (path.slice(-1) === '/') {
          path = path.substring(0, path.length - 1);
      }
      var lastSlash = path.lastIndexOf('/');
      return (lastSlash > 0) ? path.substring(0, lastSlash) : "";
  };
  
  /**
   * Returns the path with a slash at the end.
   * @private
   * @param {String} path the path to check.
   * @return {String} the path with a trailing slash.
   */
  var forceTrailingSlash = function(path) {
      // Check the name ends with a /
      if (path.slice(-1) !== "/") {
          path += "/"; // IE doesn't like substr(-1)
      }
      return path;
  };
  
  /**
   * Add a (sub) folder in the current folder.
   * @private
   * @param {string} name the folder's name
   * @param {boolean=} [createFolders] If true, automatically create sub
   *  folders. Defaults to false.
   * @return {Object} the new folder.
   */
  var folderAdd = function(name, createFolders) {
      createFolders = (typeof createFolders !== 'undefined') ? createFolders : defaults.createFolders;
  
      name = forceTrailingSlash(name);
  
      // Does this folder already exist?
      if (!this.files[name]) {
          fileAdd.call(this, name, null, {
              dir: true,
              createFolders: createFolders
          });
      }
      return this.files[name];
  };
  
  /**
  * Cross-window, cross-Node-context regular expression detection
  * @param  {Object}  object Anything
  * @return {Boolean}        true if the object is a regular expression,
  * false otherwise
  */
  function isRegExp(object) {
      return Object.prototype.toString.call(object) === "[object RegExp]";
  }
  
  // return the actual prototype of JSZip
  var out = {
      /**
       * @see loadAsync
       */
      load: function() {
          throw new Error("This method has been removed in JSZip 3.0, please check the upgrade guide.");
      },
  
  
      /**
       * Call a callback function for each entry at this folder level.
       * @param {Function} cb the callback function:
       * function (relativePath, file) {...}
       * It takes 2 arguments : the relative path and the file.
       */
      forEach: function(cb) {
          var filename, relativePath, file;
          for (filename in this.files) {
              if (!this.files.hasOwnProperty(filename)) {
                  continue;
              }
              file = this.files[filename];
              relativePath = filename.slice(this.root.length, filename.length);
              if (relativePath && filename.slice(0, this.root.length) === this.root) { // the file is in the current root
                  cb(relativePath, file); // TODO reverse the parameters ? need to be clean AND consistent with the filter search fn...
              }
          }
      },
  
      /**
       * Filter nested files/folders with the specified function.
       * @param {Function} search the predicate to use :
       * function (relativePath, file) {...}
       * It takes 2 arguments : the relative path and the file.
       * @return {Array} An array of matching elements.
       */
      filter: function(search) {
          var result = [];
          this.forEach(function (relativePath, entry) {
              if (search(relativePath, entry)) { // the file matches the function
                  result.push(entry);
              }
  
          });
          return result;
      },
  
      /**
       * Add a file to the zip file, or search a file.
       * @param   {string|RegExp} name The name of the file to add (if data is defined),
       * the name of the file to find (if no data) or a regex to match files.
       * @param   {String|ArrayBuffer|Uint8Array|Buffer} data  The file data, either raw or base64 encoded
       * @param   {Object} o     File options
       * @return  {JSZip|Object|Array} this JSZip object (when adding a file),
       * a file (when searching by string) or an array of files (when searching by regex).
       */
      file: function(name, data, o) {
          if (arguments.length === 1) {
              if (isRegExp(name)) {
                  var regexp = name;
                  return this.filter(function(relativePath, file) {
                      return !file.dir && regexp.test(relativePath);
                  });
              }
              else { // text
                  var obj = this.files[this.root + name];
                  if (obj && !obj.dir) {
                      return obj;
                  } else {
                      return null;
                  }
              }
          }
          else { // more than one argument : we have data !
              name = this.root + name;
              fileAdd.call(this, name, data, o);
          }
          return this;
      },
  
      /**
       * Add a directory to the zip file, or search.
       * @param   {String|RegExp} arg The name of the directory to add, or a regex to search folders.
       * @return  {JSZip} an object with the new directory as the root, or an array containing matching folders.
       */
      folder: function(arg) {
          if (!arg) {
              return this;
          }
  
          if (isRegExp(arg)) {
              return this.filter(function(relativePath, file) {
                  return file.dir && arg.test(relativePath);
              });
          }
  
          // else, name is a new folder
          var name = this.root + arg;
          var newFolder = folderAdd.call(this, name);
  
          // Allow chaining by returning a new object with this folder as the root
          var ret = this.clone();
          ret.root = newFolder.name;
          return ret;
      },
  
      /**
       * Delete a file, or a directory and all sub-files, from the zip
       * @param {string} name the name of the file to delete
       * @return {JSZip} this JSZip object
       */
      remove: function(name) {
          name = this.root + name;
          var file = this.files[name];
          if (!file) {
              // Look for any folders
              if (name.slice(-1) !== "/") {
                  name += "/";
              }
              file = this.files[name];
          }
  
          if (file && !file.dir) {
              // file
              delete this.files[name];
          } else {
              // maybe a folder, delete recursively
              var kids = this.filter(function(relativePath, file) {
                  return file.name.slice(0, name.length) === name;
              });
              for (var i = 0; i < kids.length; i++) {
                  delete this.files[kids[i].name];
              }
          }
  
          return this;
      },
  
      /**
       * Generate the complete zip file
       * @param {Object} options the options to generate the zip file :
       * - compression, "STORE" by default.
       * - type, "base64" by default. Values are : string, base64, uint8array, arraybuffer, blob.
       * @return {String|Uint8Array|ArrayBuffer|Buffer|Blob} the zip file
       */
      generate: function(options) {
          throw new Error("This method has been removed in JSZip 3.0, please check the upgrade guide.");
      },
  
      /**
       * Generate the complete zip file as an internal stream.
       * @param {Object} options the options to generate the zip file :
       * - compression, "STORE" by default.
       * - type, "base64" by default. Values are : string, base64, uint8array, arraybuffer, blob.
       * @return {StreamHelper} the streamed zip file.
       */
      generateInternalStream: function(options) {
        var worker, opts = {};
        try {
            opts = utils.extend(options || {}, {
                streamFiles: false,
                compression: "STORE",
                compressionOptions : null,
                type: "",
                platform: "DOS",
                comment: null,
                mimeType: 'application/zip',
                encodeFileName: utf8.utf8encode
            });
  
            opts.type = opts.type.toLowerCase();
            opts.compression = opts.compression.toUpperCase();
  
            // "binarystring" is prefered but the internals use "string".
            if(opts.type === "binarystring") {
              opts.type = "string";
            }
  
            if (!opts.type) {
              throw new Error("No output type specified.");
            }
  
            utils.checkSupport(opts.type);
  
            // accept nodejs `process.platform`
            if(
                opts.platform === 'darwin' ||
                opts.platform === 'freebsd' ||
                opts.platform === 'linux' ||
                opts.platform === 'sunos'
            ) {
                opts.platform = "UNIX";
            }
            if (opts.platform === 'win32') {
                opts.platform = "DOS";
            }
  
            var comment = opts.comment || this.comment || "";
            worker = generate.generateWorker(this, opts, comment);
        } catch (e) {
          worker = new GenericWorker("error");
          worker.error(e);
        }
        return new StreamHelper(worker, opts.type || "string", opts.mimeType);
      },
      /**
       * Generate the complete zip file asynchronously.
       * @see generateInternalStream
       */
      generateAsync: function(options, onUpdate) {
          return this.generateInternalStream(options).accumulate(onUpdate);
      },
      /**
       * Generate the complete zip file asynchronously.
       * @see generateInternalStream
       */
      generateNodeStream: function(options, onUpdate) {
          options = options || {};
          if (!options.type) {
              options.type = "nodebuffer";
          }
          return this.generateInternalStream(options).toNodejsStream(onUpdate);
      }
  };
  module.exports = out;
  /*
   * This file is used by module bundlers (browserify/webpack/etc) when
   * including a stream implementation. We use "readable-stream" to get a
   * consistent behavior between nodejs versions but bundlers often have a shim
   * for "stream". Using this shim greatly improve the compatibility and greatly
   * reduce the final size of the bundle (only one stream implementation, not
   * two).
   */
  module.exports = require("stream");
  'use strict';
  exports.LOCAL_FILE_HEADER = "PK\x03\x04";
  exports.CENTRAL_FILE_HEADER = "PK\x01\x02";
  exports.CENTRAL_DIRECTORY_END = "PK\x05\x06";
  exports.ZIP64_CENTRAL_DIRECTORY_LOCATOR = "PK\x06\x07";
  exports.ZIP64_CENTRAL_DIRECTORY_END = "PK\x06\x06";
  exports.DATA_DESCRIPTOR = "PK\x07\x08";
  'use strict';
  
  exports.base64 = true;
  exports.array = true;
  exports.string = true;
  exports.arraybuffer = typeof ArrayBuffer !== "undefined" && typeof Uint8Array !== "undefined";
  exports.nodebuffer = typeof Buffer !== "undefined";
  // contains true if JSZip can read/generate Uint8Array, false otherwise.
  exports.uint8array = typeof Uint8Array !== "undefined";
  
  if (typeof ArrayBuffer === "undefined") {
      exports.blob = false;
  }
  else {
      var buffer = new ArrayBuffer(0);
      try {
          exports.blob = new Blob([buffer], {
              type: "application/zip"
          }).size === 0;
      }
      catch (e) {
          try {
              var Builder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;
              var builder = new Builder();
              builder.append(buffer);
              exports.blob = builder.getBlob('application/zip').size === 0;
          }
          catch (e) {
              exports.blob = false;
          }
      }
  }
  
  try {
      exports.nodestream = !!require('readable-stream').Readable;
  } catch(e) {
      exports.nodestream = false;
  }
  'use strict';
  
  var utils = require('./utils');
  var support = require('./support');
  var nodejsUtils = require('./nodejsUtils');
  var GenericWorker = require('./stream/GenericWorker');
  
  /**
   * The following functions come from pako, from pako/lib/utils/strings
   * released under the MIT license, see pako https://github.com/nodeca/pako/
   */
  
  // Table with utf8 lengths (calculated by first byte of sequence)
  // Note, that 5 & 6-byte values and some 4-byte values can not be represented in JS,
  // because max possible codepoint is 0x10ffff
  var _utf8len = new Array(256);
  for (var i=0; i<256; i++) {
    _utf8len[i] = (i >= 252 ? 6 : i >= 248 ? 5 : i >= 240 ? 4 : i >= 224 ? 3 : i >= 192 ? 2 : 1);
  }
  _utf8len[254]=_utf8len[254]=1; // Invalid sequence start
  
  // convert string to array (typed, when possible)
  var string2buf = function (str) {
      var buf, c, c2, m_pos, i, str_len = str.length, buf_len = 0;
  
      // count binary size
      for (m_pos = 0; m_pos < str_len; m_pos++) {
          c = str.charCodeAt(m_pos);
          if ((c & 0xfc00) === 0xd800 && (m_pos+1 < str_len)) {
              c2 = str.charCodeAt(m_pos+1);
              if ((c2 & 0xfc00) === 0xdc00) {
                  c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
                  m_pos++;
              }
          }
          buf_len += c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : 4;
      }
  
      // allocate buffer
      if (support.uint8array) {
          buf = new Uint8Array(buf_len);
      } else {
          buf = new Array(buf_len);
      }
  
      // convert
      for (i=0, m_pos = 0; i < buf_len; m_pos++) {
          c = str.charCodeAt(m_pos);
          if ((c & 0xfc00) === 0xd800 && (m_pos+1 < str_len)) {
              c2 = str.charCodeAt(m_pos+1);
              if ((c2 & 0xfc00) === 0xdc00) {
                  c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
                  m_pos++;
              }
          }
          if (c < 0x80) {
              /* one byte */
              buf[i++] = c;
          } else if (c < 0x800) {
              /* two bytes */
              buf[i++] = 0xC0 | (c >>> 6);
              buf[i++] = 0x80 | (c & 0x3f);
          } else if (c < 0x10000) {
              /* three bytes */
              buf[i++] = 0xE0 | (c >>> 12);
              buf[i++] = 0x80 | (c >>> 6 & 0x3f);
              buf[i++] = 0x80 | (c & 0x3f);
          } else {
              /* four bytes */
              buf[i++] = 0xf0 | (c >>> 18);
              buf[i++] = 0x80 | (c >>> 12 & 0x3f);
              buf[i++] = 0x80 | (c >>> 6 & 0x3f);
              buf[i++] = 0x80 | (c & 0x3f);
          }
      }
  
      return buf;
  };
  
  // Calculate max possible position in utf8 buffer,
  // that will not break sequence. If that's not possible
  // - (very small limits) return max size as is.
  //
  // buf[] - utf8 bytes array
  // max   - length limit (mandatory);
  var utf8border = function(buf, max) {
      var pos;
  
      max = max || buf.length;
      if (max > buf.length) { max = buf.length; }
  
      // go back from last position, until start of sequence found
      pos = max-1;
      while (pos >= 0 && (buf[pos] & 0xC0) === 0x80) { pos--; }
  
      // Fuckup - very small and broken sequence,
      // return max, because we should return something anyway.
      if (pos < 0) { return max; }
  
      // If we came to start of buffer - that means vuffer is too small,
      // return max too.
      if (pos === 0) { return max; }
  
      return (pos + _utf8len[buf[pos]] > max) ? pos : max;
  };
  
  // convert array to string
  var buf2string = function (buf) {
      var str, i, out, c, c_len;
      var len = buf.length;
  
      // Reserve max possible length (2 words per char)
      // NB: by unknown reasons, Array is significantly faster for
      //     String.fromCharCode.apply than Uint16Array.
      var utf16buf = new Array(len*2);
  
      for (out=0, i=0; i<len;) {
          c = buf[i++];
          // quick process ascii
          if (c < 0x80) { utf16buf[out++] = c; continue; }
  
          c_len = _utf8len[c];
          // skip 5 & 6 byte codes
          if (c_len > 4) { utf16buf[out++] = 0xfffd; i += c_len-1; continue; }
  
          // apply mask on first byte
          c &= c_len === 2 ? 0x1f : c_len === 3 ? 0x0f : 0x07;
          // join the rest
          while (c_len > 1 && i < len) {
              c = (c << 6) | (buf[i++] & 0x3f);
              c_len--;
          }
  
          // terminated by end of string?
          if (c_len > 1) { utf16buf[out++] = 0xfffd; continue; }
  
          if (c < 0x10000) {
              utf16buf[out++] = c;
          } else {
              c -= 0x10000;
              utf16buf[out++] = 0xd800 | ((c >> 10) & 0x3ff);
              utf16buf[out++] = 0xdc00 | (c & 0x3ff);
          }
      }
  
      // shrinkBuf(utf16buf, out)
      if (utf16buf.length !== out) {
          if(utf16buf.subarray) {
              utf16buf = utf16buf.subarray(0, out);
          } else {
              utf16buf.length = out;
          }
      }
  
      // return String.fromCharCode.apply(null, utf16buf);
      return utils.applyFromCharCode(utf16buf);
  };
  
  
  // That's all for the pako functions.
  
  
  /**
   * Transform a javascript string into an array (typed if possible) of bytes,
   * UTF-8 encoded.
   * @param {String} str the string to encode
   * @return {Array|Uint8Array|Buffer} the UTF-8 encoded string.
   */
  exports.utf8encode = function utf8encode(str) {
      if (support.nodebuffer) {
          return nodejsUtils.newBuffer(str, "utf-8");
      }
  
      return string2buf(str);
  };
  
  
  /**
   * Transform a bytes array (or a representation) representing an UTF-8 encoded
   * string into a javascript string.
   * @param {Array|Uint8Array|Buffer} buf the data de decode
   * @return {String} the decoded string.
   */
  exports.utf8decode = function utf8decode(buf) {
      if (support.nodebuffer) {
          return utils.transformTo("nodebuffer", buf).toString("utf-8");
      }
  
      buf = utils.transformTo(support.uint8array ? "uint8array" : "array", buf);
  
      return buf2string(buf);
  };
  
  /**
   * A worker to decode utf8 encoded binary chunks into string chunks.
   * @constructor
   */
  function Utf8DecodeWorker() {
      GenericWorker.call(this, "utf-8 decode");
      // the last bytes if a chunk didn't end with a complete codepoint.
      this.leftOver = null;
  }
  utils.inherits(Utf8DecodeWorker, GenericWorker);
  
  /**
   * @see GenericWorker.processChunk
   */
  Utf8DecodeWorker.prototype.processChunk = function (chunk) {
  
      var data = utils.transformTo(support.uint8array ? "uint8array" : "array", chunk.data);
  
      // 1st step, re-use what's left of the previous chunk
      if (this.leftOver && this.leftOver.length) {
          if(support.uint8array) {
              var previousData = data;
              data = new Uint8Array(previousData.length + this.leftOver.length);
              data.set(this.leftOver, 0);
              data.set(previousData, this.leftOver.length);
          } else {
              data = this.leftOver.concat(data);
          }
          this.leftOver = null;
      }
  
      var nextBoundary = utf8border(data);
      var usableData = data;
      if (nextBoundary !== data.length) {
          if (support.uint8array) {
              usableData = data.subarray(0, nextBoundary);
              this.leftOver = data.subarray(nextBoundary, data.length);
          } else {
              usableData = data.slice(0, nextBoundary);
              this.leftOver = data.slice(nextBoundary, data.length);
          }
      }
  
      this.push({
          data : exports.utf8decode(usableData),
          meta : chunk.meta
      });
  };
  
  /**
   * @see GenericWorker.flush
   */
  Utf8DecodeWorker.prototype.flush = function () {
      if(this.leftOver && this.leftOver.length) {
          this.push({
              data : exports.utf8decode(this.leftOver),
              meta : {}
          });
          this.leftOver = null;
      }
  };
  exports.Utf8DecodeWorker = Utf8DecodeWorker;
  
  /**
   * A worker to endcode string chunks into utf8 encoded binary chunks.
   * @constructor
   */
  function Utf8EncodeWorker() {
      GenericWorker.call(this, "utf-8 encode");
  }
  utils.inherits(Utf8EncodeWorker, GenericWorker);
  
  /**
   * @see GenericWorker.processChunk
   */
  Utf8EncodeWorker.prototype.processChunk = function (chunk) {
      this.push({
          data : exports.utf8encode(chunk.data),
          meta : chunk.meta
      });
  };
  exports.Utf8EncodeWorker = Utf8EncodeWorker;
  'use strict';
  
  var support = require('./support');
  var base64 = require('./base64');
  var nodejsUtils = require('./nodejsUtils');
  var setImmediate = require('core-js/library/fn/set-immediate');
  var external = require("./external");
  
  
  /**
   * Convert a string that pass as a "binary string": it should represent a byte
   * array but may have > 255 char codes. Be sure to take only the first byte
   * and returns the byte array.
   * @param {String} str the string to transform.
   * @return {Array|Uint8Array} the string in a binary format.
   */
  function string2binary(str) {
      var result = null;
      if (support.uint8array) {
        result = new Uint8Array(str.length);
      } else {
        result = new Array(str.length);
      }
      return stringToArrayLike(str, result);
  }
  
  /**
   * Create a new blob with the given content and the given type.
   * @param {Array[String|ArrayBuffer]} parts the content to put in the blob. DO NOT use
   * an Uint8Array because the stock browser of android 4 won't accept it (it
   * will be silently converted to a string, "[object Uint8Array]").
   * @param {String} type the mime type of the blob.
   * @return {Blob} the created blob.
   */
  exports.newBlob = function(parts, type) {
      exports.checkSupport("blob");
  
      try {
          // Blob constructor
          return new Blob(parts, {
              type: type
          });
      }
      catch (e) {
  
          try {
              // deprecated, browser only, old way
              var Builder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;
              var builder = new Builder();
              for (var i = 0; i < parts.length; i++) {
                  builder.append(parts[i]);
              }
              return builder.getBlob(type);
          }
          catch (e) {
  
              // well, fuck ?!
              throw new Error("Bug : can't construct the Blob.");
          }
      }
  
  
  };
  /**
   * The identity function.
   * @param {Object} input the input.
   * @return {Object} the same input.
   */
  function identity(input) {
      return input;
  }
  
  /**
   * Fill in an array with a string.
   * @param {String} str the string to use.
   * @param {Array|ArrayBuffer|Uint8Array|Buffer} array the array to fill in (will be mutated).
   * @return {Array|ArrayBuffer|Uint8Array|Buffer} the updated array.
   */
  function stringToArrayLike(str, array) {
      for (var i = 0; i < str.length; ++i) {
          array[i] = str.charCodeAt(i) & 0xFF;
      }
      return array;
  }
  
  /**
   * An helper for the function arrayLikeToString.
   * This contains static informations and functions that
   * can be optimized by the browser JIT compiler.
   */
  var arrayToStringHelper = {
      /**
       * Transform an array of int into a string, chunk by chunk.
       * See the performances notes on arrayLikeToString.
       * @param {Array|ArrayBuffer|Uint8Array|Buffer} array the array to transform.
       * @param {String} type the type of the array.
       * @param {Integer} chunk the chunk size.
       * @return {String} the resulting string.
       * @throws Error if the chunk is too big for the stack.
       */
      stringifyByChunk: function(array, type, chunk) {
          var result = [], k = 0, len = array.length;
          // shortcut
          if (len <= chunk) {
              return String.fromCharCode.apply(null, array);
          }
          while (k < len) {
              if (type === "array" || type === "nodebuffer") {
                  result.push(String.fromCharCode.apply(null, array.slice(k, Math.min(k + chunk, len))));
              }
              else {
                  result.push(String.fromCharCode.apply(null, array.subarray(k, Math.min(k + chunk, len))));
              }
              k += chunk;
          }
          return result.join("");
      },
      /**
       * Call String.fromCharCode on every item in the array.
       * This is the naive implementation, which generate A LOT of intermediate string.
       * This should be used when everything else fail.
       * @param {Array|ArrayBuffer|Uint8Array|Buffer} array the array to transform.
       * @return {String} the result.
       */
      stringifyByChar: function(array){
          var resultStr = "";
          for(var i = 0; i < array.length; i++) {
              resultStr += String.fromCharCode(array[i]);
          }
          return resultStr;
      },
      applyCanBeUsed : {
          /**
           * true if the browser accepts to use String.fromCharCode on Uint8Array
           */
          uint8array : (function () {
              try {
                  return support.uint8array && String.fromCharCode.apply(null, new Uint8Array(1)).length === 1;
              } catch (e) {
                  return false;
              }
          })(),
          /**
           * true if the browser accepts to use String.fromCharCode on nodejs Buffer.
           */
          nodebuffer : (function () {
              try {
                  return support.nodebuffer && String.fromCharCode.apply(null, nodejsUtils.newBuffer(1)).length === 1;
              } catch (e) {
                  return false;
              }
          })()
      }
  };
  
  /**
   * Transform an array-like object to a string.
   * @param {Array|ArrayBuffer|Uint8Array|Buffer} array the array to transform.
   * @return {String} the result.
   */
  function arrayLikeToString(array) {
      // Performances notes :
      // --------------------
      // String.fromCharCode.apply(null, array) is the fastest, see
      // see http://jsperf.com/converting-a-uint8array-to-a-string/2
      // but the stack is limited (and we can get huge arrays !).
      //
      // result += String.fromCharCode(array[i]); generate too many strings !
      //
      // This code is inspired by http://jsperf.com/arraybuffer-to-string-apply-performance/2
      // TODO : we now have workers that split the work. Do we still need that ?
      var chunk = 65536,
          type = exports.getTypeOf(array),
          canUseApply = true;
      if (type === "uint8array") {
          canUseApply = arrayToStringHelper.applyCanBeUsed.uint8array;
      } else if (type === "nodebuffer") {
          canUseApply = arrayToStringHelper.applyCanBeUsed.nodebuffer;
      }
  
      if (canUseApply) {
          while (chunk > 1) {
              try {
                  return arrayToStringHelper.stringifyByChunk(array, type, chunk);
              } catch (e) {
                  chunk = Math.floor(chunk / 2);
              }
          }
      }
  
      // no apply or chunk error : slow and painful algorithm
      // default browser on android 4.*
      return arrayToStringHelper.stringifyByChar(array);
  }
  
  exports.applyFromCharCode = arrayLikeToString;
  
  
  /**
   * Copy the data from an array-like to an other array-like.
   * @param {Array|ArrayBuffer|Uint8Array|Buffer} arrayFrom the origin array.
   * @param {Array|ArrayBuffer|Uint8Array|Buffer} arrayTo the destination array which will be mutated.
   * @return {Array|ArrayBuffer|Uint8Array|Buffer} the updated destination array.
   */
  function arrayLikeToArrayLike(arrayFrom, arrayTo) {
      for (var i = 0; i < arrayFrom.length; i++) {
          arrayTo[i] = arrayFrom[i];
      }
      return arrayTo;
  }
  
  // a matrix containing functions to transform everything into everything.
  var transform = {};
  
  // string to ?
  transform["string"] = {
      "string": identity,
      "array": function(input) {
          return stringToArrayLike(input, new Array(input.length));
      },
      "arraybuffer": function(input) {
          return transform["string"]["uint8array"](input).buffer;
      },
      "uint8array": function(input) {
          return stringToArrayLike(input, new Uint8Array(input.length));
      },
      "nodebuffer": function(input) {
          return stringToArrayLike(input, nodejsUtils.newBuffer(input.length));
      }
  };
  
  // array to ?
  transform["array"] = {
      "string": arrayLikeToString,
      "array": identity,
      "arraybuffer": function(input) {
          return (new Uint8Array(input)).buffer;
      },
      "uint8array": function(input) {
          return new Uint8Array(input);
      },
      "nodebuffer": function(input) {
          return nodejsUtils.newBuffer(input);
      }
  };
  
  // arraybuffer to ?
  transform["arraybuffer"] = {
      "string": function(input) {
          return arrayLikeToString(new Uint8Array(input));
      },
      "array": function(input) {
          return arrayLikeToArrayLike(new Uint8Array(input), new Array(input.byteLength));
      },
      "arraybuffer": identity,
      "uint8array": function(input) {
          return new Uint8Array(input);
      },
      "nodebuffer": function(input) {
          return nodejsUtils.newBuffer(new Uint8Array(input));
      }
  };
  
  // uint8array to ?
  transform["uint8array"] = {
      "string": arrayLikeToString,
      "array": function(input) {
          return arrayLikeToArrayLike(input, new Array(input.length));
      },
      "arraybuffer": function(input) {
          // copy the uint8array: DO NOT propagate the original ArrayBuffer, it
          // can be way larger (the whole zip file for example).
          var copy = new Uint8Array(input.length);
          if (input.length) {
              copy.set(input, 0);
          }
          return copy.buffer;
      },
      "uint8array": identity,
      "nodebuffer": function(input) {
          return nodejsUtils.newBuffer(input);
      }
  };
  
  // nodebuffer to ?
  transform["nodebuffer"] = {
      "string": arrayLikeToString,
      "array": function(input) {
          return arrayLikeToArrayLike(input, new Array(input.length));
      },
      "arraybuffer": function(input) {
          return transform["nodebuffer"]["uint8array"](input).buffer;
      },
      "uint8array": function(input) {
          return arrayLikeToArrayLike(input, new Uint8Array(input.length));
      },
      "nodebuffer": identity
  };
  
  /**
   * Transform an input into any type.
   * The supported output type are : string, array, uint8array, arraybuffer, nodebuffer.
   * If no output type is specified, the unmodified input will be returned.
   * @param {String} outputType the output type.
   * @param {String|Array|ArrayBuffer|Uint8Array|Buffer} input the input to convert.
   * @throws {Error} an Error if the browser doesn't support the requested output type.
   */
  exports.transformTo = function(outputType, input) {
      if (!input) {
          // undefined, null, etc
          // an empty string won't harm.
          input = "";
      }
      if (!outputType) {
          return input;
      }
      exports.checkSupport(outputType);
      var inputType = exports.getTypeOf(input);
      var result = transform[inputType][outputType](input);
      return result;
  };
  
  /**
   * Return the type of the input.
   * The type will be in a format valid for JSZip.utils.transformTo : string, array, uint8array, arraybuffer.
   * @param {Object} input the input to identify.
   * @return {String} the (lowercase) type of the input.
   */
  exports.getTypeOf = function(input) {
      if (typeof input === "string") {
          return "string";
      }
      if (Object.prototype.toString.call(input) === "[object Array]") {
          return "array";
      }
      if (support.nodebuffer && nodejsUtils.isBuffer(input)) {
          return "nodebuffer";
      }
      if (support.uint8array && input instanceof Uint8Array) {
          return "uint8array";
      }
      if (support.arraybuffer && input instanceof ArrayBuffer) {
          return "arraybuffer";
      }
  };
  
  /**
   * Throw an exception if the type is not supported.
   * @param {String} type the type to check.
   * @throws {Error} an Error if the browser doesn't support the requested type.
   */
  exports.checkSupport = function(type) {
      var supported = support[type.toLowerCase()];
      if (!supported) {
          throw new Error(type + " is not supported by this platform");
      }
  };
  
  exports.MAX_VALUE_16BITS = 65535;
  exports.MAX_VALUE_32BITS = -1; // well, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF" is parsed as -1
  
  /**
   * Prettify a string read as binary.
   * @param {string} str the string to prettify.
   * @return {string} a pretty string.
   */
  exports.pretty = function(str) {
      var res = '',
          code, i;
      for (i = 0; i < (str || "").length; i++) {
          code = str.charCodeAt(i);
          res += '\\x' + (code < 16 ? "0" : "") + code.toString(16).toUpperCase();
      }
      return res;
  };
  
  /**
   * Defer the call of a function.
   * @param {Function} callback the function to call asynchronously.
   * @param {Array} args the arguments to give to the callback.
   */
  exports.delay = function(callback, args, self) {
      setImmediate(function () {
          callback.apply(self || null, args || []);
      });
  };
  
  /**
   * Extends a prototype with an other, without calling a constructor with
   * side effects. Inspired by nodejs' `utils.inherits`
   * @param {Function} ctor the constructor to augment
   * @param {Function} superCtor the parent constructor to use
   */
  exports.inherits = function (ctor, superCtor) {
      var Obj = function() {};
      Obj.prototype = superCtor.prototype;
      ctor.prototype = new Obj();
  };
  
  /**
   * Merge the objects passed as parameters into a new one.
   * @private
   * @param {...Object} var_args All objects to merge.
   * @return {Object} a new object with the data of the others.
   */
  exports.extend = function() {
      var result = {}, i, attr;
      for (i = 0; i < arguments.length; i++) { // arguments is not enumerable in some browsers
          for (attr in arguments[i]) {
              if (arguments[i].hasOwnProperty(attr) && typeof result[attr] === "undefined") {
                  result[attr] = arguments[i][attr];
              }
          }
      }
      return result;
  };
  
  /**
   * Transform arbitrary content into a Promise.
   * @param {String} name a name for the content being processed.
   * @param {Object} inputData the content to process.
   * @param {Boolean} isBinary true if the content is not an unicode string
   * @param {Boolean} isOptimizedBinaryString true if the string content only has one byte per character.
   * @param {Boolean} isBase64 true if the string content is encoded with base64.
   * @return {Promise} a promise in a format usable by JSZip.
   */
  exports.prepareContent = function(name, inputData, isBinary, isOptimizedBinaryString, isBase64) {
  
      // if inputData is already a promise, this flatten it.
      var promise = external.Promise.resolve(inputData).then(function(data) {
          
          
          var isBlob = support.blob && (data instanceof Blob || ['[object File]', '[object Blob]'].indexOf(Object.prototype.toString.call(data)) !== -1);
  
          if (isBlob && typeof FileReader !== "undefined") {
              return new external.Promise(function (resolve, reject) {
                  var reader = new FileReader();
  
                  reader.onload = function(e) {
                      resolve(e.target.result);
                  };
                  reader.onerror = function(e) {
                      reject(e.target.error);
                  };
                  reader.readAsArrayBuffer(data);
              });
          } else {
              return data;
          }
      });
  
      return promise.then(function(data) {
          var dataType = exports.getTypeOf(data);
  
          if (!dataType) {
              return external.Promise.reject(
                  new Error("The data of '" + name + "' is in an unsupported format !")
              );
          }
          // special case : it's way easier to work with Uint8Array than with ArrayBuffer
          if (dataType === "arraybuffer") {
              data = exports.transformTo("uint8array", data);
          } else if (dataType === "string") {
              if (isBase64) {
                  data = base64.decode(data);
              }
              else if (isBinary) {
                  // optimizedBinaryString === true means that the file has already been filtered with a 0xFF mask
                  if (isOptimizedBinaryString !== true) {
                      // this is a string, not in a base64 format.
                      // Be sure that this is a correct "binary string"
                      data = string2binary(data);
                  }
              }
          }
          return data;
      });
  };
  'use strict';
  var readerFor = require('./reader/readerFor');
  var utils = require('./utils');
  var sig = require('./signature');
  var ZipEntry = require('./zipEntry');
  var utf8 = require('./utf8');
  var support = require('./support');
  //  class ZipEntries {{{
  /**
   * All the entries in the zip file.
   * @constructor
   * @param {Object} loadOptions Options for loading the stream.
   */
  function ZipEntries(loadOptions) {
      this.files = [];
      this.loadOptions = loadOptions;
  }
  ZipEntries.prototype = {
      /**
       * Check that the reader is on the speficied signature.
       * @param {string} expectedSignature the expected signature.
       * @throws {Error} if it is an other signature.
       */
      checkSignature: function(expectedSignature) {
          if (!this.reader.readAndCheckSignature(expectedSignature)) {
              this.reader.index -= 4;
              var signature = this.reader.readString(4);
              throw new Error("Corrupted zip or bug : unexpected signature " + "(" + utils.pretty(signature) + ", expected " + utils.pretty(expectedSignature) + ")");
          }
      },
      /**
       * Check if the given signature is at the given index.
       * @param {number} askedIndex the index to check.
       * @param {string} expectedSignature the signature to expect.
       * @return {boolean} true if the signature is here, false otherwise.
       */
      isSignature: function(askedIndex, expectedSignature) {
          var currentIndex = this.reader.index;
          this.reader.setIndex(askedIndex);
          var signature = this.reader.readString(4);
          var result = signature === expectedSignature;
          this.reader.setIndex(currentIndex);
          return result;
      },
      /**
       * Read the end of the central directory.
       */
      readBlockEndOfCentral: function() {
          this.diskNumber = this.reader.readInt(2);
          this.diskWithCentralDirStart = this.reader.readInt(2);
          this.centralDirRecordsOnThisDisk = this.reader.readInt(2);
          this.centralDirRecords = this.reader.readInt(2);
          this.centralDirSize = this.reader.readInt(4);
          this.centralDirOffset = this.reader.readInt(4);
  
          this.zipCommentLength = this.reader.readInt(2);
          // warning : the encoding depends of the system locale
          // On a linux machine with LANG=en_US.utf8, this field is utf8 encoded.
          // On a windows machine, this field is encoded with the localized windows code page.
          var zipComment = this.reader.readData(this.zipCommentLength);
          var decodeParamType = support.uint8array ? "uint8array" : "array";
          // To get consistent behavior with the generation part, we will assume that
          // this is utf8 encoded unless specified otherwise.
          var decodeContent = utils.transformTo(decodeParamType, zipComment);
          this.zipComment = this.loadOptions.decodeFileName(decodeContent);
      },
      /**
       * Read the end of the Zip 64 central directory.
       * Not merged with the method readEndOfCentral :
       * The end of central can coexist with its Zip64 brother,
       * I don't want to read the wrong number of bytes !
       */
      readBlockZip64EndOfCentral: function() {
          this.zip64EndOfCentralSize = this.reader.readInt(8);
          this.reader.skip(4);
          // this.versionMadeBy = this.reader.readString(2);
          // this.versionNeeded = this.reader.readInt(2);
          this.diskNumber = this.reader.readInt(4);
          this.diskWithCentralDirStart = this.reader.readInt(4);
          this.centralDirRecordsOnThisDisk = this.reader.readInt(8);
          this.centralDirRecords = this.reader.readInt(8);
          this.centralDirSize = this.reader.readInt(8);
          this.centralDirOffset = this.reader.readInt(8);
  
          this.zip64ExtensibleData = {};
          var extraDataSize = this.zip64EndOfCentralSize - 44,
              index = 0,
              extraFieldId,
              extraFieldLength,
              extraFieldValue;
          while (index < extraDataSize) {
              extraFieldId = this.reader.readInt(2);
              extraFieldLength = this.reader.readInt(4);
              extraFieldValue = this.reader.readData(extraFieldLength);
              this.zip64ExtensibleData[extraFieldId] = {
                  id: extraFieldId,
                  length: extraFieldLength,
                  value: extraFieldValue
              };
          }
      },
      /**
       * Read the end of the Zip 64 central directory locator.
       */
      readBlockZip64EndOfCentralLocator: function() {
          this.diskWithZip64CentralDirStart = this.reader.readInt(4);
          this.relativeOffsetEndOfZip64CentralDir = this.reader.readInt(8);
          this.disksCount = this.reader.readInt(4);
          if (this.disksCount > 1) {
              throw new Error("Multi-volumes zip are not supported");
          }
      },
      /**
       * Read the local files, based on the offset read in the central part.
       */
      readLocalFiles: function() {
          var i, file;
          for (i = 0; i < this.files.length; i++) {
              file = this.files[i];
              this.reader.setIndex(file.localHeaderOffset);
              this.checkSignature(sig.LOCAL_FILE_HEADER);
              file.readLocalPart(this.reader);
              file.handleUTF8();
              file.processAttributes();
          }
      },
      /**
       * Read the central directory.
       */
      readCentralDir: function() {
          var file;
  
          this.reader.setIndex(this.centralDirOffset);
          while (this.reader.readAndCheckSignature(sig.CENTRAL_FILE_HEADER)) {
              file = new ZipEntry({
                  zip64: this.zip64
              }, this.loadOptions);
              file.readCentralPart(this.reader);
              this.files.push(file);
          }
  
          if (this.centralDirRecords !== this.files.length) {
              if (this.centralDirRecords !== 0 && this.files.length === 0) {
                  // We expected some records but couldn't find ANY.
                  // This is really suspicious, as if something went wrong.
                  throw new Error("Corrupted zip or bug: expected " + this.centralDirRecords + " records in central dir, got " + this.files.length);
              } else {
                  // We found some records but not all.
                  // Something is wrong but we got something for the user: no error here.
                  // console.warn("expected", this.centralDirRecords, "records in central dir, got", this.files.length);
              }
          }
      },
      /**
       * Read the end of central directory.
       */
      readEndOfCentral: function() {
          var offset = this.reader.lastIndexOfSignature(sig.CENTRAL_DIRECTORY_END);
          if (offset < 0) {
              // Check if the content is a truncated zip or complete garbage.
              // A "LOCAL_FILE_HEADER" is not required at the beginning (auto
              // extractible zip for example) but it can give a good hint.
              // If an ajax request was used without responseType, we will also
              // get unreadable data.
              var isGarbage = !this.isSignature(0, sig.LOCAL_FILE_HEADER);
  
              if (isGarbage) {
                  throw new Error("Can't find end of central directory : is this a zip file ? " +
                                  "If it is, see http://stuk.github.io/jszip/documentation/howto/read_zip.html");
              } else {
                  throw new Error("Corrupted zip : can't find end of central directory");
              }
  
          }
          this.reader.setIndex(offset);
          var endOfCentralDirOffset = offset;
          this.checkSignature(sig.CENTRAL_DIRECTORY_END);
          this.readBlockEndOfCentral();
  
  
          /* extract from the zip spec :
              4)  If one of the fields in the end of central directory
                  record is too small to hold required data, the field
                  should be set to -1 (0xFFFF or 0xFFFFFFFF) and the
                  ZIP64 format record should be created.
              5)  The end of central directory record and the
                  Zip64 end of central directory locator record must
                  reside on the same disk when splitting or spanning
                  an archive.
           */
          if (this.diskNumber === utils.MAX_VALUE_16BITS || this.diskWithCentralDirStart === utils.MAX_VALUE_16BITS || this.centralDirRecordsOnThisDisk === utils.MAX_VALUE_16BITS || this.centralDirRecords === utils.MAX_VALUE_16BITS || this.centralDirSize === utils.MAX_VALUE_32BITS || this.centralDirOffset === utils.MAX_VALUE_32BITS) {
              this.zip64 = true;
  
              /*
              Warning : the zip64 extension is supported, but ONLY if the 64bits integer read from
              the zip file can fit into a 32bits integer. This cannot be solved : Javascript represents
              all numbers as 64-bit double precision IEEE 754 floating point numbers.
              So, we have 53bits for integers and bitwise operations treat everything as 32bits.
              see https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Operators/Bitwise_Operators
              and http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf section 8.5
              */
  
              // should look for a zip64 EOCD locator
              offset = this.reader.lastIndexOfSignature(sig.ZIP64_CENTRAL_DIRECTORY_LOCATOR);
              if (offset < 0) {
                  throw new Error("Corrupted zip : can't find the ZIP64 end of central directory locator");
              }
              this.reader.setIndex(offset);
              this.checkSignature(sig.ZIP64_CENTRAL_DIRECTORY_LOCATOR);
              this.readBlockZip64EndOfCentralLocator();
  
              // now the zip64 EOCD record
              if (!this.isSignature(this.relativeOffsetEndOfZip64CentralDir, sig.ZIP64_CENTRAL_DIRECTORY_END)) {
                  // console.warn("ZIP64 end of central directory not where expected.");
                  this.relativeOffsetEndOfZip64CentralDir = this.reader.lastIndexOfSignature(sig.ZIP64_CENTRAL_DIRECTORY_END);
                  if (this.relativeOffsetEndOfZip64CentralDir < 0) {
                      throw new Error("Corrupted zip : can't find the ZIP64 end of central directory");
                  }
              }
              this.reader.setIndex(this.relativeOffsetEndOfZip64CentralDir);
              this.checkSignature(sig.ZIP64_CENTRAL_DIRECTORY_END);
              this.readBlockZip64EndOfCentral();
          }
  
          var expectedEndOfCentralDirOffset = this.centralDirOffset + this.centralDirSize;
          if (this.zip64) {
              expectedEndOfCentralDirOffset += 20; // end of central dir 64 locator
              expectedEndOfCentralDirOffset += 12 /* should not include the leading 12 bytes */ + this.zip64EndOfCentralSize;
          }
  
          var extraBytes = endOfCentralDirOffset - expectedEndOfCentralDirOffset;
  
          if (extraBytes > 0) {
              // console.warn(extraBytes, "extra bytes at beginning or within zipfile");
              if (this.isSignature(endOfCentralDirOffset, sig.CENTRAL_FILE_HEADER)) {
                  // The offsets seem wrong, but we have something at the specified offset.
                  // So… we keep it.
              } else {
                  // the offset is wrong, update the "zero" of the reader
                  // this happens if data has been prepended (crx files for example)
                  this.reader.zero = extraBytes;
              }
          } else if (extraBytes < 0) {
              throw new Error("Corrupted zip: missing " + Math.abs(extraBytes) + " bytes.");
          }
      },
      prepareReader: function(data) {
          this.reader = readerFor(data);
      },
      /**
       * Read a zip file and create ZipEntries.
       * @param {String|ArrayBuffer|Uint8Array|Buffer} data the binary string representing a zip file.
       */
      load: function(data) {
          this.prepareReader(data);
          this.readEndOfCentral();
          this.readCentralDir();
          this.readLocalFiles();
      }
  };
  // }}} end of ZipEntries
  module.exports = ZipEntries;
  'use strict';
  var readerFor = require('./reader/readerFor');
  var utils = require('./utils');
  var CompressedObject = require('./compressedObject');
  var crc32fn = require('./crc32');
  var utf8 = require('./utf8');
  var compressions = require('./compressions');
  var support = require('./support');
  
  var MADE_BY_DOS = 0x00;
  var MADE_BY_UNIX = 0x03;
  
  /**
   * Find a compression registered in JSZip.
   * @param {string} compressionMethod the method magic to find.
   * @return {Object|null} the JSZip compression object, null if none found.
   */
  var findCompression = function(compressionMethod) {
      for (var method in compressions) {
          if (!compressions.hasOwnProperty(method)) {
              continue;
          }
          if (compressions[method].magic === compressionMethod) {
              return compressions[method];
          }
      }
      return null;
  };
  
  // class ZipEntry {{{
  /**
   * An entry in the zip file.
   * @constructor
   * @param {Object} options Options of the current file.
   * @param {Object} loadOptions Options for loading the stream.
   */
  function ZipEntry(options, loadOptions) {
      this.options = options;
      this.loadOptions = loadOptions;
  }
  ZipEntry.prototype = {
      /**
       * say if the file is encrypted.
       * @return {boolean} true if the file is encrypted, false otherwise.
       */
      isEncrypted: function() {
          // bit 1 is set
          return (this.bitFlag & 0x0001) === 0x0001;
      },
      /**
       * say if the file has utf-8 filename/comment.
       * @return {boolean} true if the filename/comment is in utf-8, false otherwise.
       */
      useUTF8: function() {
          // bit 11 is set
          return (this.bitFlag & 0x0800) === 0x0800;
      },
      /**
       * Read the local part of a zip file and add the info in this object.
       * @param {DataReader} reader the reader to use.
       */
      readLocalPart: function(reader) {
          var compression, localExtraFieldsLength;
  
          // we already know everything from the central dir !
          // If the central dir data are false, we are doomed.
          // On the bright side, the local part is scary  : zip64, data descriptors, both, etc.
          // The less data we get here, the more reliable this should be.
          // Let's skip the whole header and dash to the data !
          reader.skip(22);
          // in some zip created on windows, the filename stored in the central dir contains \ instead of /.
          // Strangely, the filename here is OK.
          // I would love to treat these zip files as corrupted (see http://www.info-zip.org/FAQ.html#backslashes
          // or APPNOTE#4.4.17.1, "All slashes MUST be forward slashes '/'") but there are a lot of bad zip generators...
          // Search "unzip mismatching "local" filename continuing with "central" filename version" on
          // the internet.
          //
          // I think I see the logic here : the central directory is used to display
          // content and the local directory is used to extract the files. Mixing / and \
          // may be used to display \ to windows users and use / when extracting the files.
          // Unfortunately, this lead also to some issues : http://seclists.org/fulldisclosure/2009/Sep/394
          this.fileNameLength = reader.readInt(2);
          localExtraFieldsLength = reader.readInt(2); // can't be sure this will be the same as the central dir
          // the fileName is stored as binary data, the handleUTF8 method will take care of the encoding.
          this.fileName = reader.readData(this.fileNameLength);
          reader.skip(localExtraFieldsLength);
  
          if (this.compressedSize === -1 || this.uncompressedSize === -1) {
              throw new Error("Bug or corrupted zip : didn't get enough informations from the central directory " + "(compressedSize === -1 || uncompressedSize === -1)");
          }
  
          compression = findCompression(this.compressionMethod);
          if (compression === null) { // no compression found
              throw new Error("Corrupted zip : compression " + utils.pretty(this.compressionMethod) + " unknown (inner file : " + utils.transformTo("string", this.fileName) + ")");
          }
          this.decompressed = new CompressedObject(this.compressedSize, this.uncompressedSize, this.crc32, compression, reader.readData(this.compressedSize));
      },
  
      /**
       * Read the central part of a zip file and add the info in this object.
       * @param {DataReader} reader the reader to use.
       */
      readCentralPart: function(reader) {
          this.versionMadeBy = reader.readInt(2);
          reader.skip(2);
          // this.versionNeeded = reader.readInt(2);
          this.bitFlag = reader.readInt(2);
          this.compressionMethod = reader.readString(2);
          this.date = reader.readDate();
          this.crc32 = reader.readInt(4);
          this.compressedSize = reader.readInt(4);
          this.uncompressedSize = reader.readInt(4);
          var fileNameLength = reader.readInt(2);
          this.extraFieldsLength = reader.readInt(2);
          this.fileCommentLength = reader.readInt(2);
          this.diskNumberStart = reader.readInt(2);
          this.internalFileAttributes = reader.readInt(2);
          this.externalFileAttributes = reader.readInt(4);
          this.localHeaderOffset = reader.readInt(4);
  
          if (this.isEncrypted()) {
              throw new Error("Encrypted zip are not supported");
          }
  
          // will be read in the local part, see the comments there
          reader.skip(fileNameLength);
          this.readExtraFields(reader);
          this.parseZIP64ExtraField(reader);
          this.fileComment = reader.readData(this.fileCommentLength);
      },
  
      /**
       * Parse the external file attributes and get the unix/dos permissions.
       */
      processAttributes: function () {
          this.unixPermissions = null;
          this.dosPermissions = null;
          var madeBy = this.versionMadeBy >> 8;
  
          // Check if we have the DOS directory flag set.
          // We look for it in the DOS and UNIX permissions
          // but some unknown platform could set it as a compatibility flag.
          this.dir = this.externalFileAttributes & 0x0010 ? true : false;
  
          if(madeBy === MADE_BY_DOS) {
              // first 6 bits (0 to 5)
              this.dosPermissions = this.externalFileAttributes & 0x3F;
          }
  
          if(madeBy === MADE_BY_UNIX) {
              this.unixPermissions = (this.externalFileAttributes >> 16) & 0xFFFF;
              // the octal permissions are in (this.unixPermissions & 0x01FF).toString(8);
          }
  
          // fail safe : if the name ends with a / it probably means a folder
          if (!this.dir && this.fileNameStr.slice(-1) === '/') {
              this.dir = true;
          }
      },
  
      /**
       * Parse the ZIP64 extra field and merge the info in the current ZipEntry.
       * @param {DataReader} reader the reader to use.
       */
      parseZIP64ExtraField: function(reader) {
  
          if (!this.extraFields[0x0001]) {
              return;
          }
  
          // should be something, preparing the extra reader
          var extraReader = readerFor(this.extraFields[0x0001].value);
  
          // I really hope that these 64bits integer can fit in 32 bits integer, because js
          // won't let us have more.
          if (this.uncompressedSize === utils.MAX_VALUE_32BITS) {
              this.uncompressedSize = extraReader.readInt(8);
          }
          if (this.compressedSize === utils.MAX_VALUE_32BITS) {
              this.compressedSize = extraReader.readInt(8);
          }
          if (this.localHeaderOffset === utils.MAX_VALUE_32BITS) {
              this.localHeaderOffset = extraReader.readInt(8);
          }
          if (this.diskNumberStart === utils.MAX_VALUE_32BITS) {
              this.diskNumberStart = extraReader.readInt(4);
          }
      },
      /**
       * Read the central part of a zip file and add the info in this object.
       * @param {DataReader} reader the reader to use.
       */
      readExtraFields: function(reader) {
          var end = reader.index + this.extraFieldsLength,
              extraFieldId,
              extraFieldLength,
              extraFieldValue;
  
          if (!this.extraFields) {
              this.extraFields = {};
          }
  
          while (reader.index < end) {
              extraFieldId = reader.readInt(2);
              extraFieldLength = reader.readInt(2);
              extraFieldValue = reader.readData(extraFieldLength);
  
              this.extraFields[extraFieldId] = {
                  id: extraFieldId,
                  length: extraFieldLength,
                  value: extraFieldValue
              };
          }
      },
      /**
       * Apply an UTF8 transformation if needed.
       */
      handleUTF8: function() {
          var decodeParamType = support.uint8array ? "uint8array" : "array";
          if (this.useUTF8()) {
              this.fileNameStr = utf8.utf8decode(this.fileName);
              this.fileCommentStr = utf8.utf8decode(this.fileComment);
          } else {
              var upath = this.findExtraFieldUnicodePath();
              if (upath !== null) {
                  this.fileNameStr = upath;
              } else {
                  // ASCII text or unsupported code page
                  var fileNameByteArray =  utils.transformTo(decodeParamType, this.fileName);
                  this.fileNameStr = this.loadOptions.decodeFileName(fileNameByteArray);
              }
  
              var ucomment = this.findExtraFieldUnicodeComment();
              if (ucomment !== null) {
                  this.fileCommentStr = ucomment;
              } else {
                  // ASCII text or unsupported code page
                  var commentByteArray =  utils.transformTo(decodeParamType, this.fileComment);
                  this.fileCommentStr = this.loadOptions.decodeFileName(commentByteArray);
              }
          }
      },
  
      /**
       * Find the unicode path declared in the extra field, if any.
       * @return {String} the unicode path, null otherwise.
       */
      findExtraFieldUnicodePath: function() {
          var upathField = this.extraFields[0x7075];
          if (upathField) {
              var extraReader = readerFor(upathField.value);
  
              // wrong version
              if (extraReader.readInt(1) !== 1) {
                  return null;
              }
  
              // the crc of the filename changed, this field is out of date.
              if (crc32fn(this.fileName) !== extraReader.readInt(4)) {
                  return null;
              }
  
              return utf8.utf8decode(extraReader.readData(upathField.length - 5));
          }
          return null;
      },
  
      /**
       * Find the unicode comment declared in the extra field, if any.
       * @return {String} the unicode comment, null otherwise.
       */
      findExtraFieldUnicodeComment: function() {
          var ucommentField = this.extraFields[0x6375];
          if (ucommentField) {
              var extraReader = readerFor(ucommentField.value);
  
              // wrong version
              if (extraReader.readInt(1) !== 1) {
                  return null;
              }
  
              // the crc of the comment changed, this field is out of date.
              if (crc32fn(this.fileComment) !== extraReader.readInt(4)) {
                  return null;
              }
  
              return utf8.utf8decode(extraReader.readData(ucommentField.length - 5));
          }
          return null;
      }
  };
  module.exports = ZipEntry;
  'use strict';
  
  var StreamHelper = require('./stream/StreamHelper');
  var DataWorker = require('./stream/DataWorker');
  var utf8 = require('./utf8');
  var CompressedObject = require('./compressedObject');
  var GenericWorker = require('./stream/GenericWorker');
  
  /**
   * A simple object representing a file in the zip file.
   * @constructor
   * @param {string} name the name of the file
   * @param {String|ArrayBuffer|Uint8Array|Buffer} data the data
   * @param {Object} options the options of the file
   */
  var ZipObject = function(name, data, options) {
      this.name = name;
      this.dir = options.dir;
      this.date = options.date;
      this.comment = options.comment;
      this.unixPermissions = options.unixPermissions;
      this.dosPermissions = options.dosPermissions;
  
      this._data = data;
      this._dataBinary = options.binary;
      // keep only the compression
      this.options = {
          compression : options.compression,
          compressionOptions : options.compressionOptions
      };
  };
  
  ZipObject.prototype = {
      /**
       * Create an internal stream for the content of this object.
       * @param {String} type the type of each chunk.
       * @return StreamHelper the stream.
       */
      internalStream: function (type) {
          var outputType = type.toLowerCase();
          var askUnicodeString = outputType === "string" || outputType === "text";
          if (outputType === "binarystring" || outputType === "text") {
              outputType = "string";
          }
          var result = this._decompressWorker();
  
          var isUnicodeString = !this._dataBinary;
  
          if (isUnicodeString && !askUnicodeString) {
              result = result.pipe(new utf8.Utf8EncodeWorker());
          }
          if (!isUnicodeString && askUnicodeString) {
              result = result.pipe(new utf8.Utf8DecodeWorker());
          }
  
          return new StreamHelper(result, outputType, "");
      },
  
      /**
       * Prepare the content in the asked type.
       * @param {String} type the type of the result.
       * @param {Function} onUpdate a function to call on each internal update.
       * @return Promise the promise of the result.
       */
      async: function (type, onUpdate) {
          return this.internalStream(type).accumulate(onUpdate);
      },
  
      /**
       * Prepare the content as a nodejs stream.
       * @param {String} type the type of each chunk.
       * @param {Function} onUpdate a function to call on each internal update.
       * @return Stream the stream.
       */
      nodeStream: function (type, onUpdate) {
          return this.internalStream(type || "nodebuffer").toNodejsStream(onUpdate);
      },
  
      /**
       * Return a worker for the compressed content.
       * @private
       * @param {Object} compression the compression object to use.
       * @param {Object} compressionOptions the options to use when compressing.
       * @return Worker the worker.
       */
      _compressWorker: function (compression, compressionOptions) {
          if (
              this._data instanceof CompressedObject &&
              this._data.compression.magic === compression.magic
          ) {
              return this._data.getCompressedWorker();
          } else {
              var result = this._decompressWorker();
              if(!this._dataBinary) {
                  result = result.pipe(new utf8.Utf8EncodeWorker());
              }
              return CompressedObject.createWorkerFrom(result, compression, compressionOptions);
          }
      },
      /**
       * Return a worker for the decompressed content.
       * @private
       * @return Worker the worker.
       */
      _decompressWorker : function () {
          if (this._data instanceof CompressedObject) {
              return this._data.getContentWorker();
          } else if (this._data instanceof GenericWorker) {
              return this._data;
          } else {
              return new DataWorker(this._data);
          }
      }
  };
  
  var removedMethods = ["asText", "asBinary", "asNodeBuffer", "asUint8Array", "asArrayBuffer"];
  var removedFn = function () {
      throw new Error("This method has been removed in JSZip 3.0, please check the upgrade guide.");
  };
  
  for(var i = 0; i < removedMethods.length; i++) {
      ZipObject.prototype[removedMethods[i]] = removedFn;
  }
  module.exports = ZipObject;
  