CRMEB/template/admin/src/vendor/Blob.js

// +----------------------------------------------------------------------
// | CRMEB [ CRMEB赋能开发者，助力企业发展 ]
// +----------------------------------------------------------------------
// | Copyright (c) 2016~2023 https://www.crmeb.com All rights reserved.
// +----------------------------------------------------------------------
// | Licensed CRMEB并不是自由软件，未经许可不能去掉CRMEB相关版权
// +----------------------------------------------------------------------
// | Author: CRMEB Team <admin@crmeb.com>
// +----------------------------------------------------------------------

(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);