import { PACKET_TYPES } from "./commons.js"; const withNativeBlob = typeof Blob === "function" || (typeof Blob !== "undefined" && Object.prototype.toString.call(Blob) === "[object BlobConstructor]"); const withNativeArrayBuffer = typeof ArrayBuffer === "function"; // ArrayBuffer.isView method is not defined in IE10 const isView = obj => { return typeof ArrayBuffer.isView === "function" ? ArrayBuffer.isView(obj) : obj && obj.buffer instanceof ArrayBuffer; }; const encodePacket = ({ type, data }, supportsBinary, callback) => { if (withNativeBlob && data instanceof Blob) { if (supportsBinary) { return callback(data); } else { return encodeBlobAsBase64(data, callback); } } else if (withNativeArrayBuffer && (data instanceof ArrayBuffer || isView(data))) { if (supportsBinary) { return callback(data); } else { return encodeBlobAsBase64(new Blob([data]), callback); } } // plain string return callback(PACKET_TYPES[type] + (data || "")); }; const encodeBlobAsBase64 = (data, callback) => { const fileReader = new FileReader(); fileReader.onload = function () { const content = fileReader.result.split(",")[1]; callback("b" + (content || "")); }; return fileReader.readAsDataURL(data); }; export default encodePacket;