PHPOffice / PhpSpreadsheet

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

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

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

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

                    }

                    // 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->_SMALL_BLOCK_SIZE) {

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

                    }

                    // Set for PPS

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

                    $iSmBlk += $iSmbCnt;