PHPOffice / PhpSpreadsheet

                if (($raList[$i]->Size >= OLE::OLE_DATA_SIZE_SMALL) || (($raList[$i]->Type == OLE::OLE_PPS_TYPE_ROOT) && isset($raList[$i]->_data))) {

                    fwrite($FILE, $raList[$i]->_data);

                    if ($raList[$i]->Size % $this->bigBlockSize) {

                        fwrite($FILE, str_repeat("\x00", $this->bigBlockSize - ($raList[$i]->Size % $this->bigBlockSize)));

                    }

                    // Set For PPS

                    $raList[$i]->startBlock = $iStBlk;

                    $iStBlk +=

                    // Add to Data String(this will be written for RootEntry)

                    $sRes .= $raList[$i]->_data;

                    if ($raList[$i]->Size % $this->smallBlockSize) {

                        $sRes .= str_repeat("\x00", $this->smallBlockSize - ($raList[$i]->Size % $this->smallBlockSize));

                    }

                    // Set for PPS

                    $raList[$i]->startBlock = $iSmBlk;

                    $iSmBlk += $iSmbCnt;