Gz.php

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<?php
namespace Magento\Framework\Archive\Helper\File;

class Gz extends \Magento\Framework\Archive\Helper\File
{
    protected function _open($mode)
    {
        if (!extension_loaded('zlib')) {
            throw new \RuntimeException('PHP extension zlib is required.');
        }
        $this->_fileHandler = gzopen($this->_filePath, $mode);

        if (false === $this->_fileHandler) {
            throw new \Magento\Framework\Exception\LocalizedException(
                new \Magento\Framework\Phrase('The "%1" file failed to open.', [$this->_filePath])
            );
        }
    }

    protected function _write($data)
    {
        $result = gzwrite($this->_fileHandler, $data);

        if (empty($result) && !empty($data)) {
            throw new \Magento\Framework\Exception\LocalizedException(
                new \Magento\Framework\Phrase('The data failed to write to "%1".', [$this->_filePath])
            );
        }
    }

    protected function _read($length)
    {
        return gzread($this->_fileHandler, $length);
    }

    protected function _eof()
    {
        return gzeof($this->_fileHandler);
    }

    protected function _close()
    {
        gzclose($this->_fileHandler);
    }
}