private function _loadHeaders()
    {
        $this->shapeType = false;
        $this->recordNumber = $this->_loadData('N', 4);
        if ($this->recordNumber === false) {
            return;
        }
        // We read the length of the record
        $this->size = $this->_loadData('N', 4);
        if ($this->size === false) {
            return;
        }
        $this->size = $this->size * 2 + 8;
        $this->shapeType = $this->_loadData('V', 4);
    }