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Filename : FilterASCII85.php
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<?php
//
//  FPDI - Version 1.3.1
//
//    Copyright 2004-2009 Setasign - Jan Slabon
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

if (!defined('ORD_z'))
	define('ORD_z',ord('z'));
if (!defined('ORD_exclmark'))
	define('ORD_exclmark', ord('!'));
if (!defined('ORD_u'))	
	define('ORD_u', ord('u'));
if (!defined('ORD_tilde'))
	define('ORD_tilde', ord('~'));

class FilterASCII85 {
    
    function error($msg) {
        die($msg);
    }
    
    function decode($in) {
        $out = '';
        $state = 0;
        $chn = null;
        
        $l = strlen($in);
        
        for ($k = 0; $k < $l; ++$k) {
            $ch = ord($in[$k]) & 0xff;
            
            if ($ch == ORD_tilde) {
                break;
            }
            if (preg_match('/^\s$/',chr($ch))) {
                continue;
            }
            if ($ch == ORD_z && $state == 0) {
                $out .= chr(0).chr(0).chr(0).chr(0);
                continue;
            }
            if ($ch < ORD_exclmark || $ch > ORD_u) {
                $this->error('Illegal character in ASCII85Decode.');
            }
            
            $chn[$state++] = $ch - ORD_exclmark;
            
            if ($state == 5) {
                $state = 0;
                $r = 0;
                for ($j = 0; $j < 5; ++$j)
                    $r = $r * 85 + $chn[$j];
                $out .= chr($r >> 24);
                $out .= chr($r >> 16);
                $out .= chr($r >> 8);
                $out .= chr($r);
            }
        }
        $r = 0;
        
        if ($state == 1)
            $this->error('Illegal length in ASCII85Decode.');
        if ($state == 2) {
            $r = $chn[0] * 85 * 85 * 85 * 85 + ($chn[1]+1) * 85 * 85 * 85;
            $out .= chr($r >> 24);
        }
        else if ($state == 3) {
            $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85  + ($chn[2]+1) * 85 * 85;
            $out .= chr($r >> 24);
            $out .= chr($r >> 16);
        }
        else if ($state == 4) {
            $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85  + $chn[2] * 85 * 85  + ($chn[3]+1) * 85 ;
            $out .= chr($r >> 24);
            $out .= chr($r >> 16);
            $out .= chr($r >> 8);
        }

        return $out;
    }
    
    function encode($in) {
        $this->error("ASCII85 encoding not implemented.");
    }
}