Flate.php

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<?php
#require_once 'Zend/Pdf/Filter/Compression.php';

class Zend_Pdf_Filter_Compression_Flate extends Zend_Pdf_Filter_Compression
{
    public static function encode($data, $params = null)
    {
        if ($params != null) {
            $data = self::_applyEncodeParams($data, $params);
        }

        if (extension_loaded('zlib')) {
            $trackErrors = ini_get( "track_errors");
            ini_set('track_errors', '1');

            if (($output = @gzcompress($data)) === false) {
                ini_set('track_errors', $trackErrors);
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception($php_errormsg);
            }

            ini_set('track_errors', $trackErrors);
        } else {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Not implemented yet. You have to use zlib extension.');
        }

        return $output;
    }

    public static function decode($data, $params = null)
    {
        global $php_errormsg;

        if (extension_loaded('zlib')) {
            $trackErrors = ini_get( "track_errors");
            ini_set('track_errors', '1');

            if (($output = @gzuncompress($data)) === false) {
                ini_set('track_errors', $trackErrors);
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception($php_errormsg);
            }

            ini_set('track_errors', $trackErrors);
        } else {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Not implemented yet');
        }

        if ($params !== null) {
            return self::_applyDecodeParams($output, $params);
        } else {
            return $output;
        }
    }
}