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); }; function toArray(data) { if (data instanceof Uint8Array) { return data; } else if (data instanceof ArrayBuffer) { return new Uint8Array(data); } else { return new Uint8Array(data.buffer, data.byteOffset, data.byteLength); } } let TEXT_ENCODER; export function encodePacketToBinary(packet, callback) { if (withNativeBlob && packet.data instanceof Blob) { return packet.data.arrayBuffer().then(toArray).then(callback); } else if (withNativeArrayBuffer && (packet.data instanceof ArrayBuffer || isView(packet.data))) { return callback(toArray(packet.data)); } encodePacket(packet, false, (encoded) => { if (!TEXT_ENCODER) { TEXT_ENCODER = new TextEncoder(); } callback(TEXT_ENCODER.encode(encoded)); }); } export { encodePacket };