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<?php

//

//  FPDI - Version 1.5.4

//

//    Copyright 2004-2015 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.

//

/**

 * Class FilterASCII85

 */

class FilterASCII85

{

    /**

     * Decode ASCII85 encoded string

     *

     * @param string $in

     * @return string

     * @throws Exception

     */

    public function decode($in)

    {

        $ord = array(

            '~' => ord('~'),

            'z' => ord('z'),

            'u' => ord('u'),

            '!' => ord('!')

        );

        $out = '';

        $state = 0;

        $chn = null;

        $l = strlen($in);

        for ($k = 0; $k < $l; ++$k) {

            $ch = ord($in[$k]) & 0xff;

            if ($ch == $ord['~']) {

                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['!'] || $ch > $ord['u']) {

                throw new Exception('Illegal character in ASCII85Decode.');

            }

            $chn[$state++] = $ch - $ord['!'];

            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) {

            throw new Exception('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;

    }

    /**

     * NOT IMPLEMENTED

     *

     * @param string $in

     * @return string

     * @throws LogicException

     */

    public function encode($in)

    {

        throw new LogicException("ASCII85 encoding not implemented.");

    }

}