How to use the rsocket-core.BufferEncoder.decode function in rsocket-core

export function getMetadata(buffer: Buffer): Buffer {
  let offset = VERSION_SIZE;

  const serviceLength = buffer.readUInt16BE(offset);
  offset += SERVICE_LENGTH_SIZE + serviceLength;

  const methodLength = buffer.readUInt16BE(offset);
  offset += METHOD_LENGTH_SIZE + methodLength;

  const tracingLength = buffer.readUInt16BE(offset);
  offset += TRACING_LENGTH_SIZE + tracingLength;

  return BufferEncoder.decode(buffer, offset, buffer.length);
}

export function getTracing(buffer: Buffer): Buffer {
  let offset = VERSION_SIZE;

  const serviceLength = buffer.readUInt16BE(offset);
  offset += SERVICE_LENGTH_SIZE + serviceLength;

  const methodLength = buffer.readUInt16BE(offset);
  offset += METHOD_LENGTH_SIZE + methodLength;

  const tracingLength = buffer.readUInt16BE(offset);
  offset += TRACING_LENGTH_SIZE;

  return BufferEncoder.decode(buffer, offset, offset + tracingLength);
}