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Write a string to a temp file, gunzip it, clean up the temp files and return the decompressed string
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<?php | |
use Exception, | |
Zend\Filter\Decompress; | |
/** | |
* The gzip adapter for Zend's decompression filter doesn't always | |
* operate reliably on strings. This utility class transparently writes | |
* the string to a temp file and then passes it through the filter. | |
* | |
* The uncompressed result is then available through the get_string() | |
* method, or is instantly available through static method get(). | |
* | |
* Usage (#1): | |
* | |
* $unzipped_content = GunzipString::get($zipped_content); | |
* | |
* Usage (#2): | |
* | |
* $unzipper = new GunzipString($zipped_content); | |
* $unzipped_content = $unzipper->get_string(); | |
* | |
* @see http://framework.zend.com/manual/2.3/en/modules/zend.filter.set.html#compress-and-decompress | |
*/ | |
class GunzipString | |
{ | |
protected $string = ''; | |
protected $success = false; | |
protected $tmp_src = ''; | |
protected $tmp_tgt = ''; | |
public static function get($string) { | |
$unzip = new self($string); | |
return $unzip->get_string(); | |
} | |
public function __construct($string) { | |
$this->success = ($this->create_temp_file($string) && $this->decompress()); | |
} | |
protected function create_temp_file($string) { | |
$this->tmp_src = tempnam(sys_get_temp_dir(), 'scanwp'); | |
$this->tmp_tgt = tempnam(sys_get_temp_dir(), 'scanwp'); | |
return ( $this->tmp_src && file_put_contents($this->tmp_src, $string)); | |
} | |
protected function decompress() { | |
try { | |
$this->do_decompression(); | |
$this->do_cleanup(); | |
return true; | |
} | |
catch (Exception $e) { | |
return false; | |
} | |
} | |
protected function do_decompression() { | |
$filter = new Decompress([ | |
'adapter' => 'gz', | |
'options' => [ | |
'archive' => $this->tmp_src, | |
'target' => $this->tmp_tgt | |
] | |
]); | |
$this->string = $filter->filter($this->tmp_src); | |
} | |
protected function do_cleanup() { | |
unlink($this->tmp_src); | |
unlink($this->tmp_tgt); | |
} | |
public function was_successful() { | |
return $this->success; | |
} | |
public function get_string() { | |
return $this->string; | |
} | |
} |
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