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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Filter
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id$
*/
/**
* @see Zend_Filter_Compress_CompressAbstract
*/
/**
* Compression adapter for Gzip (ZLib)
*
* @category Zend
* @package Zend_Filter
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Filter_Compress_Gz extends Zend_Filter_Compress_CompressAbstract
{
/**
* Compression Options
* array(
* 'level' => Compression level 0-9
* 'mode' => Compression mode, can be 'compress', 'deflate'
* 'archive' => Archive to use
* )
*
* @var array
*/
protected $_options = array(
'level' => 9,
'mode' => 'compress',
'archive' => null,
);
/**
* Class constructor
*
* @param array|Zend_Config|null $options (Optional) Options to set
*/
public function __construct($options = null)
{
if (!extension_loaded('zlib')) {
throw new Zend_Filter_Exception('This filter needs the zlib extension');
}
parent::__construct($options);
}
/**
* Returns the set compression level
*
* @return integer
*/
public function getLevel()
{
return $this->_options['level'];
}
/**
* Sets a new compression level
*
* @param integer $level
* @return Zend_Filter_Compress_Gz
*/
public function setLevel($level)
{
if (($level < 0) || ($level > 9)) {
throw new Zend_Filter_Exception('Level must be between 0 and 9');
}
$this->_options['level'] = (int) $level;
return $this;
}
/**
* Returns the set compression mode
*
* @return string
*/
public function getMode()
{
return $this->_options['mode'];
}
/**
* Sets a new compression mode
*
* @param string $mode Supported are 'compress', 'deflate' and 'file'
*/
public function setMode($mode)
{
if (($mode != 'compress') && ($mode != 'deflate')) {
throw new Zend_Filter_Exception('Given compression mode not supported');
}
$this->_options['mode'] = $mode;
return $this;
}
/**
* Returns the set archive
*
* @return string
*/
public function getArchive()
{
return $this->_options['archive'];
}
/**
* Sets the archive to use for de-/compression
*
* @param string $archive Archive to use
* @return Zend_Filter_Compress_Gz
*/
public function setArchive($archive)
{
$this->_options['archive'] = (string) $archive;
return $this;
}
/**
* Compresses the given content
*
* @param string $content
* @return string
*/
public function compress($content)
{
$archive = $this->getArchive();
if (!empty($archive)) {
$file = gzopen($archive, 'w' . $this->getLevel());
if (!$file) {
throw new Zend_Filter_Exception("Error opening the archive '" . $this->_options['archive'] . "'");
}
gzwrite($file, $content);
gzclose($file);
$compressed = true;
} else if ($this->_options['mode'] == 'deflate') {
$compressed = gzdeflate($content, $this->getLevel());
} else {
$compressed = gzcompress($content, $this->getLevel());
}
if (!$compressed) {
throw new Zend_Filter_Exception('Error during compression');
}
return $compressed;
}
/**
* Decompresses the given content
*
* @param string $content
* @return string
*/
public function decompress($content)
{
$archive = $this->getArchive();
$mode = $this->getMode();
if (@file_exists($content)) {
$archive = $content;
}
if (@file_exists($archive)) {
$handler = fopen($archive, "rb");
if (!$handler) {
throw new Zend_Filter_Exception("Error opening the archive '" . $archive . "'");
}
fseek($handler, -4, SEEK_END);
$packet = fread($handler, 4);
$bytes = unpack("V", $packet);
$size = end($bytes);
fclose($handler);
$file = gzopen($archive, 'r');
$compressed = gzread($file, $size);
gzclose($file);
} else if ($mode == 'deflate') {
$compressed = gzinflate($content);
} else {
$compressed = gzuncompress($content);
}
if (!$compressed) {
throw new Zend_Filter_Exception('Error during compression');
}
return $compressed;
}
/**
* Returns the adapter name
*
* @return string
*/
public function toString()
{
return 'Gz';
}
}
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