Lzw.php

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

class Zend_Pdf_Filter_Compression_Lzw extends Zend_Pdf_Filter_Compression
{
    private static function _getEarlyChangeValue($params)
    {
        if (isset($params['EarlyChange'])) {
            $earlyChange = $params['EarlyChange'];

            if ($earlyChange != 0  &&  $earlyChange != 1) {
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception('Invalid value of \'EarlyChange\' decode param - ' . $earlyChange . '.' );
            }
            return $earlyChange;
        } else {
            return 1;
        }
    }


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

        #require_once 'Zend/Pdf/Exception.php';
        throw new Zend_Pdf_Exception('Not implemented yet');
    }

    public static function decode($data, $params = null)
    {
        #require_once 'Zend/Pdf/Exception.php';
        throw new Zend_Pdf_Exception('Not implemented yet');

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