Function encodeFrame

skills/brainstorming/scripts/server.cjs:15–37

(opcode, payload)

}

function encodeFrame(opcode, payload) {
  const fin = 0x80;
  const len = payload.length;
  let header;

  if (len < 126) {
    header = Buffer.alloc(2);
    header[0] = fin | opcode;
    header[1] = len;
  } else if (len < 65536) {
    header = Buffer.alloc(4);
    header[0] = fin | opcode;
    header[1] = 126;
    header.writeUInt16BE(len, 2);
  } else {
    header = Buffer.alloc(10);
    header[0] = fin | opcode;
    header[1] = 127;
    header.writeBigUInt64BE(BigInt(len), 2);
  }

  return Buffer.concat([header, payload]);
}

function decodeFrame(buffer) {
  if (buffer.length < 2) return null;