Lzf.php

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

class Zend_Filter_Compress_Lzf implements Zend_Filter_Compress_CompressInterface
{
    public function __construct()
    {
        if (!extension_loaded('lzf')) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('This filter needs the lzf extension');
        }
    }

    public function compress($content)
    {
        $compressed = lzf_compress($content);
        if (!$compressed) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('Error during compression');
        }

        return $compressed;
    }

    public function decompress($content)
    {
        $compressed = lzf_decompress($content);
        if (!$compressed) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('Error during compression');
        }

        return $compressed;
    }

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