frame/excel/Blob.js

/* eslint-disable */

/* Blob.js

* A Blob implementation.

* 2014-05-27

*

* By Eli Grey, http://eligrey.com

* By Devin Samarin, https://github.com/eboyjr

* License: X11/MIT

*  See 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

      ;

    FakeBlob.fake = FB_proto.fake = true;

    while (file_ex_code--) {

      FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;

    }

    if (!real_URL.createObjectURL) {

      URL = view.URL = {};

    }

    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 = this.data.length = 0;

    };

    return FakeBlobBuilder;

  }(view));

  view.Blob = function Blob(blobParts, options) {

    var type = options ? (options.type || "") : "";

    var builder = new BlobBuilder();

    if (blobParts) {

      for (var i = 0, len = blobParts.length; i < len; i++) {

        builder.append(blobParts[i]);

      }

    }

    return builder.getBlob(type);

  };

}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));