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4188f38a | 1 | <?php |
2 | // | |
3 | // FPDI - Version 1.3.1 | |
4 | // | |
5 | // Copyright 2004-2009 Setasign - Jan Slabon | |
6 | // | |
7 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
8 | // you may not use this file except in compliance with the License. | |
9 | // You may obtain a copy of the License at | |
10 | // | |
11 | // http://www.apache.org/licenses/LICENSE-2.0 | |
12 | // | |
13 | // Unless required by applicable law or agreed to in writing, software | |
14 | // distributed under the License is distributed on an "AS IS" BASIS, | |
15 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
16 | // See the License for the specific language governing permissions and | |
17 | // limitations under the License. | |
18 | // | |
19 | ||
20 | if (!defined('ORD_z')) | |
21 | define('ORD_z',ord('z')); | |
22 | if (!defined('ORD_exclmark')) | |
23 | define('ORD_exclmark', ord('!')); | |
24 | if (!defined('ORD_u')) | |
25 | define('ORD_u', ord('u')); | |
26 | if (!defined('ORD_tilde')) | |
27 | define('ORD_tilde', ord('~')); | |
28 | ||
29 | class FilterASCII85 { | |
30 | ||
31 | function error($msg) { | |
32 | die($msg); | |
33 | } | |
34 | ||
35 | function decode($in) { | |
36 | $out = ''; | |
37 | $state = 0; | |
38 | $chn = null; | |
39 | ||
40 | $l = strlen($in); | |
41 | ||
42 | for ($k = 0; $k < $l; ++$k) { | |
43 | $ch = ord($in[$k]) & 0xff; | |
44 | ||
45 | if ($ch == ORD_tilde) { | |
46 | break; | |
47 | } | |
48 | if (preg_match('/^\s$/',chr($ch))) { | |
49 | continue; | |
50 | } | |
51 | if ($ch == ORD_z && $state == 0) { | |
52 | $out .= chr(0).chr(0).chr(0).chr(0); | |
53 | continue; | |
54 | } | |
55 | if ($ch < ORD_exclmark || $ch > ORD_u) { | |
56 | $this->error('Illegal character in ASCII85Decode.'); | |
57 | } | |
58 | ||
59 | $chn[$state++] = $ch - ORD_exclmark; | |
60 | ||
61 | if ($state == 5) { | |
62 | $state = 0; | |
63 | $r = 0; | |
64 | for ($j = 0; $j < 5; ++$j) | |
65 | $r = $r * 85 + $chn[$j]; | |
66 | $out .= chr($r >> 24); | |
67 | $out .= chr($r >> 16); | |
68 | $out .= chr($r >> 8); | |
69 | $out .= chr($r); | |
70 | } | |
71 | } | |
72 | $r = 0; | |
73 | ||
74 | if ($state == 1) | |
75 | $this->error('Illegal length in ASCII85Decode.'); | |
76 | if ($state == 2) { | |
77 | $r = $chn[0] * 85 * 85 * 85 * 85 + ($chn[1]+1) * 85 * 85 * 85; | |
78 | $out .= chr($r >> 24); | |
79 | } | |
80 | else if ($state == 3) { | |
81 | $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + ($chn[2]+1) * 85 * 85; | |
82 | $out .= chr($r >> 24); | |
83 | $out .= chr($r >> 16); | |
84 | } | |
85 | else if ($state == 4) { | |
86 | $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + $chn[2] * 85 * 85 + ($chn[3]+1) * 85 ; | |
87 | $out .= chr($r >> 24); | |
88 | $out .= chr($r >> 16); | |
89 | $out .= chr($r >> 8); | |
90 | } | |
91 | ||
92 | return $out; | |
93 | } | |
94 | ||
95 | function encode($in) { | |
96 | $this->error("ASCII85 encoding not implemented."); | |
97 | } | |
98 | } |