Bz2.php

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<?php
#require_once 'Zend/Filter/Compress/CompressAbstract.php';

class Zend_Filter_Compress_Bz2 extends Zend_Filter_Compress_CompressAbstract
{
    protected $_options = array(
        'blocksize' => 4,
        'archive'   => null,
    );

    public function __construct($options = null)
    {
        if (!extension_loaded('bz2')) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('This filter needs the bz2 extension');
        }
        parent::__construct($options);
    }

    public function getBlocksize()
    {
        return $this->_options['blocksize'];
    }

    public function setBlocksize($blocksize)
    {
        if (($blocksize < 0) || ($blocksize > 9)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('Blocksize must be between 0 and 9');
        }

        $this->_options['blocksize'] = (int) $blocksize;
        return $this;
    }

    public function getArchive()
    {
        return $this->_options['archive'];
    }

    public function setArchive($archive)
    {
        $this->_options['archive'] = (string) $archive;
        return $this;
    }

    public function compress($content)
    {
        $archive = $this->getArchive();
        if (!empty($archive)) {
            $file = bzopen($archive, 'w');
            if (!$file) {
                #require_once 'Zend/Filter/Exception.php';
                throw new Zend_Filter_Exception("Error opening the archive '" . $archive . "'");
            }

            bzwrite($file, $content);
            bzclose($file);
            $compressed = true;
        } else {
            $compressed = bzcompress($content, $this->getBlocksize());
        }

        if (is_int($compressed)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('Error during compression');
        }

        return $compressed;
    }

    public function decompress($content)
    {
        $archive = $this->getArchive();
        if (@file_exists($content)) {
            $archive = $content;
        }

        if (@file_exists($archive)) {
            $file = bzopen($archive, 'r');
            if (!$file) {
                #require_once 'Zend/Filter/Exception.php';
                throw new Zend_Filter_Exception("Error opening the archive '" . $content . "'");
            }

            $compressed = bzread($file);
            bzclose($file);
        } else {
            $compressed = bzdecompress($content);
        }

        if (is_int($compressed)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('Error during decompression');
        }

        return $compressed;
    }

    public function toString()
    {
        return 'Bz2';
    }
}