text: /* Blob.js
   * A Blob implementation.
   * 2018-01-12
   *
   * By Eli Grey, http://eligrey.com
   * By Devin Samarin, https://github.com/dsamarin
   * License: MIT
   *   See https://github.com/eligrey/Blob.js/blob/master/LICENSE.md
   */
  
  /*global self, unescape */
  /*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
    plusplus: true */
  
  /*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */
  
  (function (view) {
      "use strict";
  
      view.URL = view.URL || view.webkitURL;
  
      if (view.Blob && view.URL) {
          try {
              new Blob;
              return;
          } catch (e) {}
      }
  
      // Internally we use a BlobBuilder implementation to base Blob off of
      // in order to support older browsers that only have BlobBuilder
      var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function(view) {
          var
              get_class = function(object) {
                  return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1];
              }
              , FakeBlobBuilder = function BlobBuilder() {
                  this.data = [];
              }
              , FakeBlob = function Blob(data, type, encoding) {
                  this.data = data;
                  this.size = data.length;
                  this.type = type;
                  this.encoding = encoding;
              }
              , FBB_proto = FakeBlobBuilder.prototype
              , FB_proto = FakeBlob.prototype
              , FileReaderSync = view.FileReaderSync
              , FileException = function(type) {
                  this.code = this[this.name = type];
              }
              , file_ex_codes = (
                  "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR "
                  + "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
              ).split(" ")
              , file_ex_code = file_ex_codes.length
              , real_URL = view.URL || view.webkitURL || view
              , real_create_object_URL = real_URL.createObjectURL
              , real_revoke_object_URL = real_URL.revokeObjectURL
              , URL = real_URL
              , btoa = view.btoa
              , atob = view.atob
  
              , ArrayBuffer = view.ArrayBuffer
              , Uint8Array = view.Uint8Array
  
              , origin = /^[\w-]+:\/*\[?[\w\.:-]+\]?(?::[0-9]+)?/
          ;
          FakeBlob.fake = FB_proto.fake = true;
          while (file_ex_code--) {
              FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
          }
          // Polyfill URL
          if (!real_URL.createObjectURL) {
              URL = view.URL = function(uri) {
                  var
                      uri_info = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
                      , uri_origin
                  ;
                  uri_info.href = uri;
                  if (!("origin" in uri_info)) {
                      if (uri_info.protocol.toLowerCase() === "data:") {
                          uri_info.origin = null;
                      } else {
                          uri_origin = uri.match(origin);
                          uri_info.origin = uri_origin && uri_origin[1];
                      }
                  }
                  return uri_info;
              };
          }
          URL.createObjectURL = function(blob) {
              var
                  type = blob.type
                  , data_URI_header
              ;
              if (type === null) {
                  type = "application/octet-stream";
              }
              if (blob instanceof FakeBlob) {
                  data_URI_header = "data:" + type;
                  if (blob.encoding === "base64") {
                      return data_URI_header + ";base64," + blob.data;
                  } else if (blob.encoding === "URI") {
                      return data_URI_header + "," + decodeURIComponent(blob.data);
                  } if (btoa) {
                      return data_URI_header + ";base64," + btoa(blob.data);
                  } else {
                      return data_URI_header + "," + encodeURIComponent(blob.data);
                  }
              } else if (real_create_object_URL) {
                  return real_create_object_URL.call(real_URL, blob);
              }
          };
          URL.revokeObjectURL = function(object_URL) {
              if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
                  real_revoke_object_URL.call(real_URL, object_URL);
              }
          };
          FBB_proto.append = function(data/*, endings*/) {
              var bb = this.data;
              // decode data to a binary string
              if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) {
                  var
                      str = ""
                      , buf = new Uint8Array(data)
                      , i = 0
                      , buf_len = buf.length
                  ;
                  for (; i < buf_len; i++) {
                      str += String.fromCharCode(buf[i]);
                  }
                  bb.push(str);
              } else if (get_class(data) === "Blob" || get_class(data) === "File") {
                  if (FileReaderSync) {
                      var fr = new FileReaderSync;
                      bb.push(fr.readAsBinaryString(data));
                  } else {
                      // async FileReader won't work as BlobBuilder is sync
                      throw new FileException("NOT_READABLE_ERR");
                  }
              } else if (data instanceof FakeBlob) {
                  if (data.encoding === "base64" && atob) {
                      bb.push(atob(data.data));
                  } else if (data.encoding === "URI") {
                      bb.push(decodeURIComponent(data.data));
                  } else if (data.encoding === "raw") {
                      bb.push(data.data);
                  }
              } else {
                  if (typeof data !== "string") {
                      data += ""; // convert unsupported types to strings
                  }
                  // decode UTF-16 to binary string
                  bb.push(unescape(encodeURIComponent(data)));
              }
          };
          FBB_proto.getBlob = function(type) {
              if (!arguments.length) {
                  type = null;
              }
              return new FakeBlob(this.data.join(""), type, "raw");
          };
          FBB_proto.toString = function() {
              return "[object BlobBuilder]";
          };
          FB_proto.slice = function(start, end, type) {
              var args = arguments.length;
              if (args < 3) {
                  type = null;
              }
              return new FakeBlob(
                  this.data.slice(start, args > 1 ? end : this.data.length)
                  , type
                  , this.encoding
              );
          };
          FB_proto.toString = function() {
              return "[object Blob]";
          };
          FB_proto.close = function() {
              this.size = 0;
              delete this.data;
          };
          return FakeBlobBuilder;
      }(view));
  
      view.Blob = function(blobParts, options) {
          var type = options ? (options.type || "") : "";
          var builder = new BlobBuilder();
          if (blobParts) {
              for (var i = 0, len = blobParts.length; i < len; i++) {
                  if (Uint8Array && blobParts[i] instanceof Uint8Array) {
                      builder.append(blobParts[i].buffer);
                  }
                  else {
                      builder.append(blobParts[i]);
                  }
              }
          }
          var blob = builder.getBlob(type);
          if (!blob.slice && blob.webkitSlice) {
              blob.slice = blob.webkitSlice;
          }
          return blob;
      };
  
      var getPrototypeOf = Object.getPrototypeOf || function(object) {
          return object.__proto__;
      };
      view.Blob.prototype = getPrototypeOf(new view.Blob());
  }(
      typeof self !== "undefined" && self
      || typeof window !== "undefined" && window
      || this
  ));
  