/**
* Initialize tarball reader
*
* @return \Magento\Framework\Archive\Tar
*/
protected function _initReader()
{
$this->_reader = new \Magento\Framework\Archive\Helper\File($this->_getCurrentFile());
$this->_reader->open('r');
return $this;
}
/**
* Extract next file from tarball by its $header information and save it to $destination
*
* @param array $fileHeader
* @param string $destination
* @return void
*/
protected function _extractAndWriteFile($fileHeader, $destination)
{
$fileWriter = new File($destination);
$fileWriter->open('w', $fileHeader['mode']);
$archiveReader = $this->_getReader();
$filesize = $fileHeader['size'];
$bytesExtracted = 0;
while ($filesize > $bytesExtracted && !$archiveReader->eof()) {
$block = $archiveReader->read(self::TAR_BLOCK_SIZE);
$nonExtractedBytesCount = $filesize - $bytesExtracted;
$data = substr($block, 0, $nonExtractedBytesCount);
$fileWriter->write($data);
$bytesExtracted += strlen($block);
}
}