message: Enabled using all extended memory in swoole_buffer.
diff: @@ -138,7 +138,7 @@ static PHP_METHOD(swoole_buffer, append)
  }
  swString *buffer = swoole_get_object(getThis());
  - if ((str.length + buffer->length) > SW_STRING_BUFFER_MAXLEN)
  + if ((str.length + buffer->length) > buffer->size && (str.length + buffer->length) > SW_STRING_BUFFER_MAXLEN)
  {
  php_error_docref(NULL TSRMLS_CC, E_WARNING, "buffer size must not exceed %d", SW_STRING_BUFFER_MAXLEN);
  RETURN_FALSE;
  