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();

**/

/**
 * Representation a of zip file in js
 * @constructor
 * @param {String=|ArrayBuffer=|Uint8Array=} 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 = "";

    JSZip.utils.init();

   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 () {
   /**
    * A simple object representing a file in the zip file.
    * @constructor
    * @param {string} name the name of the file
    * @param {string} 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 () {
         var result = this.data;
         if (this.options.base64) {
            result = JSZipBase64.decode(result);
         }
         if (this.options.binary) {
            result = JSZip.prototype.utf8decode(result);
         }
         return result;
      },
      /**
       * Returns the binary content.
       * @return {string} the content as binary.
       */
      asBinary : function () {
         var result = this.data;
         if (this.options.base64) {
            result = JSZipBase64.decode(result);
         }
         if (!this.options.binary) {
            result = JSZip.prototype.utf8encode(result);
         }
         return result;
      },
      /**
       * Returns the content as an Uint8Array.
       * @return {Uint8Array} the content as an Uint8Array.
       */
      asUint8Array : function () {
         return JSZip.utils.string2Uint8Array(this.asBinary());
      },
      /**
       * Returns the content as an ArrayBuffer.
       * @return {ArrayBuffer} the content as an ArrayBufer.
       */
      asArrayBuffer : function () {
         return JSZip.utils.string2Uint8Array(this.asBinary()).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();

      return o;
   };

  /**
   * Add a file in the current folder.
   * @private
   * @param {string} name the name of the file
   * @param {String|ArrayBuffer|Uint8Array} 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);
      if (parent) {
         folderAdd.call(this, parent);
      }

      o = prepareFileAttrs(o);

      if (JSZip.support.uint8array && data instanceof Uint8Array) {
         o.base64 = false;
         o.binary = true;
         data = JSZip.utils.uint8Array2String(data);
      } else if (JSZip.support.arraybuffer && data instanceof ArrayBuffer) {
         o.base64 = false;
         o.binary = true;
         var bufferView = new Uint8Array(data);
         data = JSZip.utils.uint8Array2String(bufferView);
      } else 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);
         }
         // we remove this option since it's only relevant here
         delete o.optimizedBinaryString;
      }

      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]) {
         // be sure sub folders exist
         var parent = parentFolder(name);
         if (parent) {
            folderAdd.call(this, parent);
         }

         fileAdd.call(this, name, '', {dir:true});
      }
      return this.files[name];
   };

   /**
    * Generate the data found in the local header of a zip file.
    * Do not create it now, as some parts are re-used later.
    * @private
    * @param {Object} file the file to use.
    * @param {string} utfEncodedFileName the file name, utf8 encoded.
    * @param {string} compressionType the compression to use.
    * @return {Object} an object containing header and compressedData.
    */
   var prepareLocalHeaderData = function(file, utfEncodedFileName, compressionType) {
      var useUTF8 = utfEncodedFileName !== file.name,
          data    = file.asBinary(),
          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 compression    = JSZip.compressions[compressionType];
      var compressedData = compression.compress(data);

      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 += compression.magic;
      // last mod file time
      header += decToHex(dosTime, 2);
      // last mod file date
      header += decToHex(dosDate, 2);
      // crc-32
      header += decToHex(this.crc32(data), 4);
      // compressed size
      header += decToHex(compressedData.length, 4);
      // uncompressed size
      header += decToHex(data.length, 4);
      // file name length
      header += decToHex(utfEncodedFileName.length, 2);
      // extra field length
      header += "\x00\x00";

      return {
         header:header,
         compressedData:compressedData
      };
   };


   // 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} 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} 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|Blob} the zip file
       */
      generate : function(options) {
         options = extend(options || {}, {
            base64 : true,
            compression : "STORE",
            type : "base64"
         });
         var compression = options.compression.toUpperCase();

         if (!JSZip.compressions[compression]) {
            throw compression + " is not a valid compression method !";
         }

        // The central directory, and files data
        var directory = [], files = [], fileOffset = 0;

        for (var name in this.files) {
            if ( !this.files.hasOwnProperty(name) ) { continue; }
            meta
            var file = this.files[name];

            var utfEncodedFileName = this.utf8encode(file.name);

            var fileRecord = "",
            dirRecord = "",
            data = prepareLocalHeaderData.call(this, file, utfEncodedFileName, compression);
            fileRecord = JSZip.signature.LOCAL_FILE_HEADER + data.header + utfEncodedFileName + data.compressedData;

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

            fileOffset += fileRecord.length;

            files.push(fileRecord);
            directory.push(dirRecord);
         }

         var fileData = files.join("");
         var dirData = directory.join("");

         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(files.length, 2) +
         // total number of entries in the central directory
         decToHex(files.length, 2) +
         // size of the central directory   4 bytes
         decToHex(dirData.length, 4) +
         // offset of start of central directory with respect to the starting disk number
         decToHex(fileData.length, 4) +
         // .ZIP file comment length
         "\x00\x00";

         var zip = fileData + dirData + dirEnd;


         switch(options.type.toLowerCase()) {
            case "uint8array" :
               return JSZip.utils.string2Uint8Array(zip);
            case "arraybuffer" :
               return JSZip.utils.string2Uint8Array(zip).buffer;
            case "blob" :
               return JSZip.utils.string2Blob(zip);
            case "base64" :
               return (options.base64) ? JSZipBase64.encode(zip) : zip;
            default : // case "string" :
               return zip;
         }
      },

      /**
       *
       *  Javascript crc32
       *  http://www.webtoolkit.info/
       *
       */
      crc32 : function(str, crc) {

         if (str === "" || typeof str === "undefined") {
            return 0;
         }

         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;

         crc = crc ^ (-1);
         for( var i = 0, iTop = str.length; i < iTop; i++ ) {
            y = ( crc ^ str.charCodeAt( i ) ) & 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) {
         string = string.replace(/\r\n/g,"\n");
         var utftext = "";

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

            var c = string.charCodeAt(n);

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

         }

         return utftext;
      },

      /**
       * http://www.webtoolkit.info/javascript-utf8.html
       */
      utf8decode : function (utftext) {
         var string = "";
         var i = 0;
         var c = 0, c1 = 0, c2 = 0, c3 = 0;

         while ( i < utftext.length ) {

            c = utftext.charCodeAt(i);

            if (c < 128) {
               string += String.fromCharCode(c);
               i++;
            } else if ((c > 191) && (c < 224)) {
               c2 = utftext.charCodeAt(i+1);
               string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
               i += 2;
            } else {
               c2 = utftext.charCodeAt(i+1);
               c3 = utftext.charCodeAt(i+2);
               string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
               i += 3;
            }

         }

         return string;
      }
   };
}());

/*
 * 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.
 * }
 *
 * 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
      }
   }
};

/*
 * 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 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;
   })()
};

JSZip.utils = {

    buildString: function (str) {
        var result = [], bigresult = [];
        var k = 0;

        for (var i = 0; i < str.length; i++) {
            var c = i % 1024;
            var val = str.charCodeAt (i);
            //result [c] = (val <= 0xff ? str.charAt(i) : String.fromCharCode(val & 0xff));
            result [c] = (val <= 0xff ? str.charAt(i) : this.ccStrs[val & 0xff]);
            if (c === 1023 || i === str.length - 1) {
                bigresult[k] = result.join("");
                result.length = 0;
                k++;
            }
        }

        var final = bigresult.join("");
        return final;
    },

    ccStrs: [],
    init: function () {
        // make cache of first 256 char codes
        if (this.ccStrs.length === 0) {
            for (var n = 0; n < 256; n++) {
                this.ccStrs.push (String.fromCharCode (n));
            }
        }
    },
   /**
    * 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) {
        for (var i = 0; i < str.length; i++) {
           if (str.charCodeAt(i) > 0xff) {
               return JSZip.utils.buildString (str);
           }
       }
       return str;
    },
   /**
    * 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.
    */
   string2Uint8Array : function (str) {
      if (!JSZip.support.uint8array) {
         throw new Error("Uint8Array is not supported by this browser");
      }
      var buffer = new ArrayBuffer(str.length);
      var bufferView = new Uint8Array(buffer);
      for(var i = 0; i < str.length; i++) {
         bufferView[i] = str.charCodeAt(i);
      }

      return bufferView;
   },

   /**
    * 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.
    */
   uint8Array2String : function (array, start, end) {

      if (!JSZip.support.uint8array) {
         throw new Error("Uint8Array is not supported by this browser");
      }

       start = start | 0;
       if (end == undefined) {
           end = array.length;
       }

       var result = [];
       var bigresult = [];
       var k = 0;

       for (var i = start; i < end; i++) {
           var c = i % 1024;
           result [c] = this.ccStrs [array[i]];
           if (c === 1023 || i === end - 1) {
               bigresult[k] = result.join("");
               result.length = 0;
               k++;
           }
       }

       return bigresult.join("");
   },
   /**
    * Create a blob from the given string.
    * @param {string} str the string to transform.
    * @return {Blob} the string.
    * @throws {Error} an Error if the browser doesn't support the requested feature.
    */
   string2Blob : function (str) {
      if (!JSZip.support.blob) {
         throw new Error("Blob is not supported by this browser");
      }

      var buffer = JSZip.utils.string2Uint8Array(str).buffer;
      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.");
   }
};

/**
 *
 *  Base64 encode / decode
 *  http://www.webtoolkit.info/
 *
 *  Hacked so that it doesn't utf8 en/decode everything
 **/
var JSZipBase64 = (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: