Function _getInitialDataUrl

docs/app/js/sanddance-app.js:55199–55244

()

    return _getInitialDataUrl.apply(this, arguments);
}
function _getInitialDataUrl() {
    _getInitialDataUrl = (0, _asyncToGeneratorDefault.default)((0, _regeneratorDefault.default).mark(function _callee4(resource) {
        var INITIAL_DATA_LENGTH, blobSlice, slice, base64;
        return (0, _regeneratorDefault.default).wrap(function _callee4$(_context4) {
            while(true)switch(_context4.prev = _context4.next){
                case 0:
                    INITIAL_DATA_LENGTH = 5;
                    if (!(typeof resource === "string")) {
                        _context4.next = 3;
                        break;
                    }
                    return _context4.abrupt("return", "data:,".concat(resource.slice(0, INITIAL_DATA_LENGTH)));
                case 3:
                    if (!(resource instanceof Blob)) {
                        _context4.next = 8;
                        break;
                    }
                    blobSlice = resource.slice(0, 5);
                    _context4.next = 7;
                    return new Promise(function(resolve) {
                        var reader = new FileReader();
                        reader.onload = function(event) {
                            return resolve(event.target && event.target.result);
                        };
                        reader.readAsDataURL(blobSlice);
                    });
                case 7:
                    return _context4.abrupt("return", _context4.sent);
                case 8:
                    if (!(resource instanceof ArrayBuffer)) {
                        _context4.next = 12;
                        break;
                    }
                    slice = resource.slice(0, INITIAL_DATA_LENGTH);
                    base64 = arrayBufferToBase64(slice);
                    return _context4.abrupt("return", "data:base64,".concat(base64));
                case 12:
                    return _context4.abrupt("return", null);
                case 13:
                case "end":
                    return _context4.stop();
            }
        }, _callee4);
    }));
    return _getInitialDataUrl.apply(this, arguments);
}
function arrayBufferToBase64(buffer) {
    var binary = "";
    var bytes = new Uint8Array(buffer);