import { PACKET_TYPES } from "./commons.js"; export const encodePacket = ({ type, data }, supportsBinary, callback) => { if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) { return callback(supportsBinary ? data : "b" + toBuffer(data, true).toString("base64")); } // plain string return callback(PACKET_TYPES[type] + (data || "")); }; const toBuffer = (data, forceBufferConversion) => { if (Buffer.isBuffer(data) || (data instanceof Uint8Array && !forceBufferConversion)) { return data; } else if (data instanceof ArrayBuffer) { return Buffer.from(data); } else { return Buffer.from(data.buffer, data.byteOffset, data.byteLength); } }; let TEXT_ENCODER; export function encodePacketToBinary(packet, callback) { if (packet.data instanceof ArrayBuffer || ArrayBuffer.isView(packet.data)) { return callback(toBuffer(packet.data, false)); } encodePacket(packet, true, encoded => { if (!TEXT_ENCODER) { // lazily created for compatibility with Node.js 10 TEXT_ENCODER = new TextEncoder(); } callback(TEXT_ENCODER.encode(encoded)); }); }