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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
  */
 // require_once 'Zend/Filter/Compress/CompressAbstract.php';
 
 /**
  * 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')) {
             // require_once 'Zend/Filter/Exception.php';
             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)) {
             // require_once 'Zend/Filter/Exception.php';
             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')) {
             // require_once 'Zend/Filter/Exception.php';
             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) {
                 // require_once 'Zend/Filter/Exception.php';
                 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) {
             // require_once 'Zend/Filter/Exception.php';
             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) {
                 // require_once 'Zend/Filter/Exception.php';
                 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) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('Error during compression');
         }
 
         return $compressed;
     }
 
     /**
      * Returns the adapter name
      *
      * @return string
      */
     public function toString()
     {
         return 'Gz';
     }
 }