62     var $currentDataFile = null;  variable in File_Archive_Writer_MemoryArchive
129             if ($this->currentDataFile !== null) {
131                                   $this->currentDataFile);
142             $this->currentDataFile = null;
151         if ($this->currentDataFile !== null) {
152             $this->buffer .= file_get_contents($this->currentDataFile);
153             $this->currentDataFile = null;
162         if ($this->currentDataFile === null && empty($this->buffer)) {
163             $this->currentDataFile = $filename;
165             if ($this->currentDataFile !== null) {
166                 $this->buffer .= file_get_contents($this->currentDataFile);
167                 $this->currentDataFile = null;