jszip.js

/**

JSZip - A Javascript class for generating and reading zip files
<http://stuartk.com/jszip>

(c) 2009-2012 Stuart Knightley <stuart [at] stuartk.com>
Dual licenced under the MIT license or GPLv3. See LICENSE.markdown.

Usage:
   zip = new JSZip();
   zip.file("hello.txt", "Hello, World!").file("tempfile", "nothing");
   zip.folder("images").file("smile.gif", base64Data, {base64: true});
   zip.file("Xmas.txt", "Ho ho ho !", {date : new Date("December 25, 2007 00:00:01")});
   zip.remove("tempfile");

   base64zip = zip.generate();

**/
"use strict";

/**
 * Representation a of zip file in js
 * @constructor
 * @param {String=|ArrayBuffer=|Uint8Array=|Buffer=} data the data to load, if any (optional).
 * @param {Object=} options the options for creating this objects (optional).
 */
var JSZip = function(data, options) {
   // object containing the files :
   // {
   //   "folder/" : {...},
   //   "folder/data.txt" : {...}
   // }
   this.files = {};

   // Where we are in the hierarchy
   this.root = "";

   if (data) {
      this.load(data, options);
   }
};

JSZip.signature = {
   LOCAL_FILE_HEADER : "\x50\x4b\x03\x04",
   CENTRAL_FILE_HEADER : "\x50\x4b\x01\x02",
   CENTRAL_DIRECTORY_END : "\x50\x4b\x05\x06",
   ZIP64_CENTRAL_DIRECTORY_LOCATOR : "\x50\x4b\x06\x07",
   ZIP64_CENTRAL_DIRECTORY_END : "\x50\x4b\x06\x06",
   DATA_DESCRIPTOR : "\x50\x4b\x07\x08"
};

// Default properties for a new file
JSZip.defaults = {
   base64: false,
   binary: false,
   dir: false,
   date: null,
   compression: null
};


JSZip.prototype = (function () {

   /**
    * Returns the raw data of a ZipObject, decompress the content if necessary.
    * @param {ZipObject} file the file to use.
    * @return {String|ArrayBuffer|Uint8Array|Buffer} the data.
    */
   var getRawData = function (file) {
      if (file._data instanceof JSZip.CompressedObject) {
         file._data = file._data.getContent();
         file.options.binary = true;
         file.options.base64 = false;

         if (JSZip.utils.getTypeOf(file._data) === "uint8array") {
            var copy = file._data;
            // when reading an arraybuffer, the CompressedObject mechanism will keep it and subarray() a Uint8Array.
            // if we request a file in the same format, we might get the same Uint8Array or its ArrayBuffer (the original zip file).
            file._data = new Uint8Array(copy.length);
            // with an empty Uint8Array, Opera fails with a "Offset larger than array size"
            if (copy.length !== 0) {
               file._data.set(copy, 0);
            }
         }
      }
      return file._data;
   };

   /**
    * Returns the data of a ZipObject in a binary form. If the content is an unicode string, encode it.
    * @param {ZipObject} file the file to use.
    * @return {String|ArrayBuffer|Uint8Array|Buffer} the data.
    */
   var getBinaryData = function (file) {
      var result = getRawData(file), type = JSZip.utils.getTypeOf(result);
      if (type === "string") {
         if (!file.options.binary) {
            // unicode text !
            // unicode string => binary string is a painful process, check if we can avoid it.
            if (JSZip.support.uint8array && typeof TextEncoder === "function") {
               return TextEncoder("utf-8").encode(result);
            }
            if (JSZip.support.nodebuffer) {
               return new Buffer(result, "utf-8");
            }
         }
         return file.asBinary();
      }
      return result;
   }

   /**
    * Transform this._data into a string.
    * @param {function} filter a function String -> String, applied if not null on the result.
    * @return {String} the string representing this._data.
    */
   var dataToString = function (asUTF8) {
      var result = getRawData(this);
      if (result === null || typeof result === "undefined") {
         return "";
      }
      // if the data is a base64 string, we decode it before checking the encoding !
      if (this.options.base64) {
         result = JSZip.base64.decode(result);
      }
      if (asUTF8 && this.options.binary) {
         // JSZip.prototype.utf8decode supports arrays as input
         // skip to array => string step, utf8decode will do it.
         result = JSZip.prototype.utf8decode(result);
      } else {
         // no utf8 transformation, do the array => string step.
         result = JSZip.utils.transformTo("string", result);
      }

      if (!asUTF8 && !this.options.binary) {
         result = JSZip.prototype.utf8encode(result);
      }
      return result;
   };
   /**
    * 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._data = data;
      this.options = options;
   };

   ZipObject.prototype = {
      /**
       * Return the content as UTF8 string.
       * @return {string} the UTF8 string.
       */
      asText : function () {
         return dataToString.call(this, true);
      },
      /**
       * Returns the binary content.
       * @return {string} the content as binary.
       */
      asBinary : function () {
         return dataToString.call(this, false);
      },
      /**
       * Returns the content as a nodejs Buffer.
       * @return {Buffer} the content as a Buffer.
       */
      asNodeBuffer : function () {
         var result = getBinaryData(this);
         return JSZip.utils.transformTo("nodebuffer", result);
      },
      /**
       * Returns the content as an Uint8Array.
       * @return {Uint8Array} the content as an Uint8Array.
       */
      asUint8Array : function () {
         var result = getBinaryData(this);
         return JSZip.utils.transformTo("uint8array", result);
      },
      /**
       * Returns the content as an ArrayBuffer.
       * @return {ArrayBuffer} the content as an ArrayBufer.
       */
      asArrayBuffer : function () {
         return this.asUint8Array().buffer;
      }
   };

   /**
    * Transform an integer into a string in hexadecimal.
    * @private
    * @param {number} dec the number to convert.
    * @param {number} bytes the number of bytes to generate.
    * @returns {string} the result.
    */
   var decToHex = function(dec, bytes) {
      var hex = "", i;
      for(i = 0; i < bytes; i++) {
         hex += String.fromCharCode(dec&0xff);
         dec=dec>>>8;
      }
      return hex;
   };

   /**
    * 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.
    */
   var 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;
   };

   /**
    * Transforms the (incomplete) options from the user into the complete
    * set of options to create a file.
    * @private
    * @param {Object} o the options from the user.
    * @return {Object} the complete set of options.
    */
   var prepareFileAttrs = function (o) {
      o = o || {};
      if (o.base64 === true && o.binary == null) {
         o.binary = true;
      }
      o = extend(o, JSZip.defaults);
      o.date = o.date || new Date();
      if (o.compression !== null) o.compression = o.compression.toUpperCase();

      return o;
   };

   /**
    * 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} o the options of the file
    * @return {Object} the new file.
    */
   var fileAdd = function (name, data, o) {
      // be sure sub folders exist
      var parent = parentFolder(name), dataType = JSZip.utils.getTypeOf(data);
      if (parent) {
         folderAdd.call(this, parent);
      }

      o = prepareFileAttrs(o);

      if (o.dir || data === null || typeof data === "undefined") {
         o.base64 = false;
         o.binary = false;
         data = null;
      } else if (dataType === "string") {
         if (o.binary && !o.base64) {
            // optimizedBinaryString == true means that the file has already been filtered with a 0xFF mask
            if (o.optimizedBinaryString !== true) {
               // this is a string, not in a base64 format.
               // Be sure that this is a correct "binary string"
               data = JSZip.utils.string2binary(data);
            }
         }
      } else { // arraybuffer, uint8array, ...
         o.base64 = false;
         o.binary = true;

         if (!dataType && !(data instanceof JSZip.CompressedObject)) {
            throw 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 = JSZip.utils.transformTo("uint8array", data);
         }
      }

      return this.files[name] = new ZipObject(name, data, o);
   };


   /**
    * 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) : "";
   };

   /**
    * Add a (sub) folder in the current folder.
    * @private
    * @param {string} name the folder's name
    * @return {Object} the new folder.
    */
   var folderAdd = function (name) {
      // Check the name ends with a /
      if (name.slice(-1) != "/") {
         name += "/"; // IE doesn't like substr(-1)
      }

      // Does this folder already exist?
      if (!this.files[name]) {
         fileAdd.call(this, name, null, {dir:true});
      }
      return this.files[name];
   };

   /**
    * Generate a JSZip.CompressedObject for a given zipOject.
    * @param {ZipObject} file the object to read.
    * @param {JSZip.compression} compression the compression to use.
    * @return {JSZip.CompressedObject} the compressed result.
    */
   var generateCompressedObjectFrom = function (file, compression) {
      var result = new JSZip.CompressedObject(), content;

      // the data has not been decompressed, we might reuse things !
      if (file._data instanceof JSZip.CompressedObject) {
         result.uncompressedSize = file._data.uncompressedSize;
         result.crc32 = file._data.crc32;

         if (result.uncompressedSize === 0 || file.options.dir) {
            compression = JSZip.compressions['STORE'];
            result.compressedContent = "";
            result.crc32 = 0;
         } else if (file._data.compressionMethod === compression.magic) {
            result.compressedContent = file._data.getCompressedContent();
         } else {
            content = file._data.getContent()
            // need to decompress / recompress
            result.compressedContent = compression.compress(JSZip.utils.transformTo(compression.compressInputType, content));
         }
      } else {
         // have uncompressed data
         content = getBinaryData(file);
         if (!content || content.length === 0 || file.options.dir) {
            compression = JSZip.compressions['STORE'];
            content = "";
         }
         result.uncompressedSize = content.length;
         result.crc32 = this.crc32(content);
         result.compressedContent = compression.compress(JSZip.utils.transformTo(compression.compressInputType, content));
      }

      result.compressedSize = result.compressedContent.length;
      result.compressionMethod = compression.magic;

      return result;
   };

   /**
    * Generate the various parts used in the construction of the final zip file.
    * @param {string} name the file name.
    * @param {ZipObject} file the file content.
    * @param {JSZip.CompressedObject} compressedObject the compressed object.
    * @param {number} offset the current offset from the start of the zip file.
    * @return {object} the zip parts.
    */
   var generateZipParts = function(name, file, compressedObject, offset) {
      var data = compressedObject.compressedContent,
          utfEncodedFileName = this.utf8encode(file.name),
          useUTF8 = utfEncodedFileName !== file.name,
          o       = file.options,
          dosTime,
          dosDate;

      // date
      // @see http://www.delorie.com/djgpp/doc/rbinter/it/52/13.html
      // @see http://www.delorie.com/djgpp/doc/rbinter/it/65/16.html
      // @see http://www.delorie.com/djgpp/doc/rbinter/it/66/16.html

      dosTime = o.date.getHours();
      dosTime = dosTime << 6;
      dosTime = dosTime | o.date.getMinutes();
      dosTime = dosTime << 5;
      dosTime = dosTime | o.date.getSeconds() / 2;

      dosDate = o.date.getFullYear() - 1980;
      dosDate = dosDate << 4;
      dosDate = dosDate | (o.date.getMonth() + 1);
      dosDate = dosDate << 5;
      dosDate = dosDate | o.date.getDate();


      var header = "";

      // version needed to extract
      header += "\x0A\x00";
      // general purpose bit flag
      // set bit 11 if utf8
      header += useUTF8 ? "\x00\x08" : "\x00\x00";
      // compression method
      header += compressedObject.compressionMethod;
      // last mod file time
      header += decToHex(dosTime, 2);
      // last mod file date
      header += decToHex(dosDate, 2);
      // crc-32
      header += decToHex(compressedObject.crc32, 4);
      // compressed size
      header += decToHex(compressedObject.compressedSize, 4);
      // uncompressed size
      header += decToHex(compressedObject.uncompressedSize, 4);
      // file name length
      header += decToHex(utfEncodedFileName.length, 2);
      // extra field length
      header += "\x00\x00";


      var fileRecord = JSZip.signature.LOCAL_FILE_HEADER + header + utfEncodedFileName;

      var dirRecord = JSZip.signature.CENTRAL_FILE_HEADER +
      // version made by (00: DOS)
      "\x14\x00" +
      // file header (common to file and central directory)
      header +
      // file comment length
      "\x00\x00" +
      // disk number start
      "\x00\x00" +
      // internal file attributes TODO
      "\x00\x00" +
      // external file attributes
      (file.options.dir===true?"\x10\x00\x00\x00":"\x00\x00\x00\x00")+
      // relative offset of local header
      decToHex(offset, 4) +
      // file name
      utfEncodedFileName;


      return {
         fileRecord : fileRecord,
         dirRecord : dirRecord,
         compressedObject : compressedObject
      };
   };

   /**
    * An object to write any content to a string.
    * @constructor
    */
   var StringWriter = function () {
      this.data = [];
   };
   StringWriter.prototype = {
      /**
       * Append any content to the current string.
       * @param {Object} input the content to add.
       */
      append : function (input) {
         input = JSZip.utils.transformTo("string", input);
         this.data.push(input);
      },
      /**
       * Finalize the construction an return the result.
       * @return {string} the generated string.
       */
      finalize : function () {
         return this.data.join("");
      }
   };
   /**
    * An object to write any content to an Uint8Array.
    * @constructor
    * @param {number} length The length of the array.
    */
   var Uint8ArrayWriter = function (length) {
      this.data = new Uint8Array(length);
      this.index = 0;
   };
   Uint8ArrayWriter.prototype = {
      /**
       * Append any content to the current array.
       * @param {Object} input the content to add.
       */
      append : function (input) {
         if (input.length !== 0) {
            // with an empty Uint8Array, Opera fails with a "Offset larger than array size"
            input = JSZip.utils.transformTo("uint8array", input);
            this.data.set(input, this.index);
            this.index += input.length;
         }
      },
      /**
       * Finalize the construction an return the result.
       * @return {Uint8Array} the generated array.
       */
      finalize : function () {
         return this.data;
      }
   };

   // return the actual prototype of JSZip
   return {
      /**
       * Read an existing zip and merge the data in the current JSZip object.
       * The implementation is in jszip-load.js, don't forget to include it.
       * @param {String|ArrayBuffer|Uint8Array|Buffer} stream  The stream to load
       * @param {Object} options Options for loading the stream.
       *  options.base64 : is the stream in base64 ? default : false
       * @return {JSZip} the current JSZip object
       */
      load : function (stream, options) {
         throw new Error("Load method is not defined. Is the file jszip-load.js included ?");
      },

      /**
       * 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 = [], filename, relativePath, file, fileClone;
         for (filename in this.files) {
            if ( !this.files.hasOwnProperty(filename) ) { continue; }
            file = this.files[filename];
            // return a new object, don't let the user mess with our internal objects :)
            fileClone = new ZipObject(file.name, file._data, extend(file.options));
            relativePath = filename.slice(this.root.length, filename.length);
            if (filename.slice(0, this.root.length) === this.root && // the file is in the current root
                search(relativePath, fileClone)) { // and the file matches the function
               result.push(fileClone);
            }
         }
         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 (name instanceof RegExp) {
               var regexp = name;
               return this.filter(function(relativePath, file) {
                  return !file.options.dir && regexp.test(relativePath);
               });
            } else { // text
               return this.filter(function (relativePath, file) {
                  return !file.options.dir && relativePath === name;
               })[0]||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 (arg instanceof RegExp) {
            return this.filter(function(relativePath, file) {
               return file.options.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) {
            if (!file.options.dir) {
               // file
               delete this.files[name];
            } else {
               // folder
               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 :
       * - base64, (deprecated, use type instead) true to generate base64.
       * - 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) {
         options = extend(options || {}, {
            base64 : true,
            compression : "STORE",
            type : "base64"
         });

         JSZip.utils.checkSupport(options.type);

         var zipData = [], localDirLength = 0, centralDirLength = 0, writer, i;


         // first, generate all the zip parts.
         for (var name in this.files) {
            if ( !this.files.hasOwnProperty(name) ) { continue; }
            var file = this.files[name];

            var compressionName = file.compression || options.compression.toUpperCase();
            var compression = JSZip.compressions[compressionName];
            if (!compression) {
               throw new Error(compressionName + " is not a valid compression method !");
            }

            var compressedObject = generateCompressedObjectFrom.call(this, file, compression);

            var zipPart = generateZipParts.call(this, name, file, compressedObject, localDirLength);
            localDirLength += zipPart.fileRecord.length + compressedObject.compressedSize;
            centralDirLength += zipPart.dirRecord.length;
            zipData.push(zipPart);
         }

         var dirEnd = "";

         // end of central dir signature
         dirEnd = JSZip.signature.CENTRAL_DIRECTORY_END +
         // number of this disk
         "\x00\x00" +
         // number of the disk with the start of the central directory
         "\x00\x00" +
         // total number of entries in the central directory on this disk
         decToHex(zipData.length, 2) +
         // total number of entries in the central directory
         decToHex(zipData.length, 2) +
         // size of the central directory   4 bytes
         decToHex(centralDirLength, 4) +
         // offset of start of central directory with respect to the starting disk number
         decToHex(localDirLength, 4) +
         // .ZIP file comment length
         "\x00\x00";


         // we have all the parts (and the total length)
         // time to create a writer !
         switch(options.type.toLowerCase()) {
            case "uint8array" :
            case "arraybuffer" :
            case "blob" :
            case "nodebuffer" :
               writer = new Uint8ArrayWriter(localDirLength + centralDirLength + dirEnd.length);
               break;
            case "base64" :
            default : // case "string" :
               writer = new StringWriter(localDirLength + centralDirLength + dirEnd.length);
               break;
         }

         for (i = 0; i < zipData.length; i++) {
            writer.append(zipData[i].fileRecord);
            writer.append(zipData[i].compressedObject.compressedContent);
         }
         for (i = 0; i < zipData.length; i++) {
            writer.append(zipData[i].dirRecord);
         }

         writer.append(dirEnd);

         var zip = writer.finalize();



         switch(options.type.toLowerCase()) {
            // case "zip is an Uint8Array"
            case "uint8array" :
            case "arraybuffer" :
            case "nodebuffer" :
               return JSZip.utils.transformTo(options.type.toLowerCase(), zip);
            case "blob" :
               return JSZip.utils.arrayBuffer2Blob(JSZip.utils.transformTo("arraybuffer", zip));

            // case "zip is a string"
            case "base64" :
               return (options.base64) ? JSZip.base64.encode(zip) : zip;
            default : // case "string" :
               return zip;
         }
      },

      /**
       *
       *  Javascript crc32
       *  http://www.webtoolkit.info/
       *
       */
      crc32 : function crc32(input, crc) {
         if (typeof input === "undefined" || !input.length) {
            return 0;
         }

         var isArray = JSZip.utils.getTypeOf(input) !== "string";

         var table = [
            0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
            0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
            0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
            0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
            0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
            0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
            0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
            0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
            0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
            0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
            0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
            0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
            0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
            0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
            0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
            0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
            0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
            0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
            0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
            0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
            0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
            0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
            0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
            0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
            0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
            0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
            0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
            0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
            0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
            0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
            0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
            0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
            0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
            0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
            0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
            0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
            0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
            0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
            0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
            0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
            0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
            0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
            0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
            0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
            0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
            0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
            0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
            0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
            0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
            0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
            0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
            0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
            0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
            0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
            0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
            0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
            0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
            0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
            0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
            0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
            0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
            0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
            0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
            0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
         ];

         if (typeof(crc) == "undefined") { crc = 0; }
         var x = 0;
         var y = 0;
         var byte = 0;

         crc = crc ^ (-1);
         for( var i = 0, iTop = input.length; i < iTop; i++ ) {
            byte = isArray ? input[i] : input.charCodeAt(i);
            y = ( crc ^ byte ) & 0xFF;
            x = table[y];
            crc = ( crc >>> 8 ) ^ x;
         }

         return crc ^ (-1);
      },

      // Inspired by http://my.opera.com/GreyWyvern/blog/show.dml/1725165
      clone : function() {
         var newObj = new JSZip();
         for (var i in this) {
            if (typeof this[i] !== "function") {
               newObj[i] = this[i];
            }
         }
         return newObj;
      },


      /**
       * http://www.webtoolkit.info/javascript-utf8.html
       */
      utf8encode : function (string) {
         // TextEncoder + Uint8Array to binary string is faster than checking every bytes on long strings.
         // http://jsperf.com/utf8encode-vs-textencoder
         // On short strings (file names for example), the TextEncoder API is (currently) slower.
         if (JSZip.support.uint8array && typeof TextEncoder === "function") {
            var u8 = TextEncoder("utf-8").encode(string);
            return JSZip.utils.transformTo("string", u8);
         }
         if (JSZip.support.nodebuffer) {
            return JSZip.utils.transformTo("string", new Buffer(string, "utf-8"));
         }

         // array.join may be slower than string concatenation but generates less objects (less time spent garbage collecting).
         // See also http://jsperf.com/array-direct-assignment-vs-push/31
         var result = [], resIndex = 0;

         for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
               result[resIndex++] = String.fromCharCode(c);
            } else if ((c > 127) && (c < 2048)) {
               result[resIndex++] = String.fromCharCode((c >> 6) | 192);
               result[resIndex++] = String.fromCharCode((c & 63) | 128);
            } else {
               result[resIndex++] = String.fromCharCode((c >> 12) | 224);
               result[resIndex++] = String.fromCharCode(((c >> 6) & 63) | 128);
               result[resIndex++] = String.fromCharCode((c & 63) | 128);
            }

         }

         return result.join("");
      },

      /**
       * http://www.webtoolkit.info/javascript-utf8.html
       */
      utf8decode : function (input) {
         var result = [], resIndex = 0;
         var type = JSZip.utils.getTypeOf(input);
         var isArray = type !== "string";
         var i = 0;
         var c = 0, c1 = 0, c2 = 0, c3 = 0;

         // check if we can use the TextDecoder API
         // see http://encoding.spec.whatwg.org/#api
         if (JSZip.support.uint8array && typeof TextDecoder === "function") {
            return TextDecoder("utf-8").decode(
               JSZip.utils.transformTo("uint8array", input)
            );
         }
         if (JSZip.support.nodebuffer) {
            return JSZip.utils.transformTo("nodebuffer", input).toString("utf-8");
         }

         while ( i < input.length ) {

            c = isArray ? input[i] : input.charCodeAt(i);

            if (c < 128) {
               result[resIndex++] = String.fromCharCode(c);
               i++;
            } else if ((c > 191) && (c < 224)) {
               c2 = isArray ? input[i+1] : input.charCodeAt(i+1);
               result[resIndex++] = String.fromCharCode(((c & 31) << 6) | (c2 & 63));
               i += 2;
            } else {
               c2 = isArray ? input[i+1] : input.charCodeAt(i+1);
               c3 = isArray ? input[i+2] : input.charCodeAt(i+2);
               result[resIndex++] = String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
               i += 3;
            }

         }

         return result.join("");
      }
   };
}());

/*
 * Compression methods
 * This object is filled in as follow :
 * name : {
 *    magic // the 2 bytes indentifying the compression method
 *    compress // function, take the uncompressed content and return it compressed.
 *    uncompress // function, take the compressed content and return it uncompressed.
 *    compressInputType // string, the type accepted by the compress method. null to accept everything.
 *    uncompressInputType // string, the type accepted by the uncompress method. null to accept everything.
 * }
 *
 * STORE is the default compression method, so it's included in this file.
 * Other methods should go to separated files : the user wants modularity.
 */
JSZip.compressions = {
   "STORE" : {
      magic : "\x00\x00",
      compress : function (content) {
         return content; // no compression
      },
      uncompress : function (content) {
         return content; // no compression
      },
      compressInputType : null,
      uncompressInputType : null
   }
};

/*
 * List features that require a modern browser, and if the current browser support them.
 */
JSZip.support = {
   // contains true if JSZip can read/generate ArrayBuffer, false otherwise.
   arraybuffer : (function(){
      return typeof ArrayBuffer !== "undefined" && typeof Uint8Array !== "undefined";
   })(),
   // contains true if JSZip can read/generate nodejs Buffer, false otherwise.
   nodebuffer : (function(){
      return typeof Buffer !== "undefined";
   })(),
   // contains true if JSZip can read/generate Uint8Array, false otherwise.
   uint8array : (function(){
      return typeof Uint8Array !== "undefined";
   })(),
   // contains true if JSZip can read/generate Blob, false otherwise.
   blob : (function(){
      // the spec started with BlobBuilder then replaced it with a construtor for Blob.
      // Result : we have browsers that :
      // * know the BlobBuilder (but with prefix)
      // * know the Blob constructor
      // * know about Blob but not about how to build them
      // About the "=== 0" test : if given the wrong type, it may be converted to a string.
      // Instead of an empty content, we will get "[object Uint8Array]" for example.
      if (typeof ArrayBuffer === "undefined") {
         return false;
      }
      var buffer = new ArrayBuffer(0);
      try {
         return new Blob([buffer], { type: "application/zip" }).size === 0;
      }
      catch(e) {}

      try {
         var builder = new (window.BlobBuilder || window.WebKitBlobBuilder ||
                            window.MozBlobBuilder || window.MSBlobBuilder)();
         builder.append(buffer);
         return builder.getBlob('application/zip').size === 0;
      }
      catch(e) {}

      return false;
   })()
};

(function () {
   JSZip.utils = {
      /**
       * Convert a string to a "binary string" : a string containing only char codes between 0 and 255.
       * @param {string} str the string to transform.
       * @return {String} the binary string.
       */
      string2binary : function (str) {
         var result = "";
         for (var i = 0; i < str.length; i++) {
            result += String.fromCharCode(str.charCodeAt(i) & 0xff);
         }
         return result;
      },
      /**
       * Create a Uint8Array from the string.
       * @param {string} str the string to transform.
       * @return {Uint8Array} the typed array.
       * @throws {Error} an Error if the browser doesn't support the requested feature.
       * @deprecated : use JSZip.utils.transformTo instead.
       */
      string2Uint8Array : function (str) {
         return JSZip.utils.transformTo("uint8array", str);
      },

      /**
       * Create a string from the Uint8Array.
       * @param {Uint8Array} array the array to transform.
       * @return {string} the string.
       * @throws {Error} an Error if the browser doesn't support the requested feature.
       * @deprecated : use JSZip.utils.transformTo instead.
       */
      uint8Array2String : function (array) {
         return JSZip.utils.transformTo("string", array);
      },
      /**
       * Create a blob from the given ArrayBuffer.
       * @param {ArrayBuffer} buffer the buffer to transform.
       * @return {Blob} the result.
       * @throws {Error} an Error if the browser doesn't support the requested feature.
       */
      arrayBuffer2Blob : function (buffer) {
         JSZip.utils.checkSupport("blob");

         try {
            // Blob constructor
            return new Blob([buffer], { type: "application/zip" });
         }
         catch(e) {}

         try {
            // deprecated, browser only, old way
            var builder = new (window.BlobBuilder || window.WebKitBlobBuilder ||
                               window.MozBlobBuilder || window.MSBlobBuilder)();
            builder.append(buffer);
            return builder.getBlob('application/zip');
         }
         catch(e) {}

         // well, fuck ?!
         throw new Error("Bug : can't construct the Blob.");
      },
      /**
       * Create a blob from the given string.
       * @param {string} str the string to transform.
       * @return {Blob} the result.
       * @throws {Error} an Error if the browser doesn't support the requested feature.
       */
      string2Blob : function (str) {
         var buffer = JSZip.utils.transformTo("arraybuffer", str);
         return JSZip.utils.arrayBuffer2Blob(buffer);
      }
   };

   /**
    * 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;
   };

   /**
    * 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
      var chunk = 65536;
      var result = [], len = array.length, type = JSZip.utils.getTypeOf(array), k = 0;

      while (k < len && chunk > 1) {
         try {
            if (type === "array" || type === "nodebuffer") {
               result.push(String.fromCharCode.apply(null, array.slice(k, Math.max(k + chunk, len))));
            } else {
               result.push(String.fromCharCode.apply(null, array.subarray(k, k + chunk)));
            }
            k += chunk;
         } catch (e) {
            chunk = Math.floor(chunk / 2);
         }
      }
      return result.join("");
   };

   /**
    * 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, new Buffer(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 new Buffer(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 new Buffer(new Uint8Array(input));
      }
   };

   // uint8array to ?
   transform["uint8array"] = {
      "string" : arrayLikeToString,
      "array" : function (input) {
         return arrayLikeToArrayLike(input, new Array(input.length));
      },
      "arraybuffer" : function (input) {
         return input.buffer;
      },
      "uint8array" : identity,
      "nodebuffer" : function(input) {
         return new Buffer(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.
    */
   JSZip.utils.transformTo = function (outputType, input) {
      if (!input) {
         // undefined, null, etc
         // an empty string won't harm.
         input = "";
      }
      if (!outputType) {
         return input;
      }
      JSZip.utils.checkSupport(outputType);
      var inputType = JSZip.utils.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.
    */
   JSZip.utils.getTypeOf = function (input) {
      if (typeof input === "string") {
         return "string";
      }
      if (input instanceof Array) {
         return "array";
      }
      if (JSZip.support.nodebuffer && Buffer.isBuffer(input)) {
         return "nodebuffer";
      }
      if (JSZip.support.uint8array && input instanceof Uint8Array) {
         return "uint8array";
      }
      if (JSZip.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.
    */
   JSZip.utils.checkSupport = function (type) {
      var supported = true;
      switch (type.toLowerCase()) {
         case "uint8array":
            supported = JSZip.support.uint8array;
         break;
         case "arraybuffer":
            supported = JSZip.support.arraybuffer;
         break;
         case "nodebuffer":
            supported = JSZip.support.nodebuffer;
         break;
         case "blob":
            supported = JSZip.support.blob;
         break;
      }
      if (!supported) {
         throw new Error(type + " is not supported by this browser");
      }
   };


})();

(function (){
   /**
    * Represents an entry in the zip.
    * The content may or may not be compressed.
    * @constructor
    */
   JSZip.CompressedObject = function () {
         this.compressedSize = 0;
         this.uncompressedSize = 0;
         this.crc32 = 0;
         this.compressionMethod = null;
         this.compressedContent = null;
   };

   JSZip.CompressedObject.prototype = {
      /**
       * Return the decompressed content in an unspecified format.
       * The format will depend on the decompressor.
       * @return {Object} the decompressed content.
       */
      getContent : function () {
         return null; // see implementation
      },
      /**
       * Return the compressed content in an unspecified format.
       * The format will depend on the compressed conten source.
       * @return {Object} the compressed content.
       */
      getCompressedContent : function () {
         return null; // see implementation
      }
   };
})();

/**
 *
 *  Base64 encode / decode
 *  http://www.webtoolkit.info/
 *
 *  Hacked so that it doesn't utf8 en/decode everything
 **/
JSZip.base64 = (function() {
   // private property
   var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

   return {
      // public method for encoding
      encode : function(input, utf8) {
         var output = "";
         var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
         var i = 0;

         while (i < input.length) {

            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
               enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
               enc4 = 64;
            }

            output = output +
               _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
               _keyStr.charAt(enc3) + _keyStr.charAt(enc4);

         }

         return output;
      },

      // public method for decoding
      decode : function(input, utf8) {
         var output = "";
         var chr1, chr2, chr3;
         var enc1, enc2, enc3, enc4;
         var i = 0;

         input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

         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 = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
               output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
               output = output + String.fromCharCode(chr3);
            }

         }

         return output;

      }
   };
}());

// enforcing Stuk's coding style
// vim: set shiftwidth=3 softtabstop=3: