1 | <?php |
---|
2 | // |
---|
3 | // FPDI - Version 1.2 |
---|
4 | // |
---|
5 | // Copyright 2004-2007 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 ASCII85Decode { |
---|
30 | |
---|
31 | function ASCII85Decode(&$fpdi) { |
---|
32 | $this->fpdi =& $fpdi; |
---|
33 | } |
---|
34 | |
---|
35 | |
---|
36 | function decode($in) { |
---|
37 | $out = ""; |
---|
38 | $state = 0; |
---|
39 | $chn = null; |
---|
40 | |
---|
41 | $l = strlen($in); |
---|
42 | |
---|
43 | for ($k = 0; $k < $l; ++$k) { |
---|
44 | $ch = ord($in[$k]) & 0xff; |
---|
45 | |
---|
46 | if ($ch == ORD_tilde) { |
---|
47 | break; |
---|
48 | } |
---|
49 | if (preg_match("/^\s$/",chr($ch))) { |
---|
50 | continue; |
---|
51 | } |
---|
52 | if ($ch == ORD_z && $state == 0) { |
---|
53 | $out .= chr(0).chr(0).chr(0).chr(0); |
---|
54 | continue; |
---|
55 | } |
---|
56 | if ($ch < ORD_exclmark || $ch > ORD_u) { |
---|
57 | $this->fpdi->error("Illegal character in ASCII85Decode."); |
---|
58 | } |
---|
59 | |
---|
60 | $chn[$state++] = $ch - ORD_exclmark; |
---|
61 | |
---|
62 | if ($state == 5) { |
---|
63 | $state = 0; |
---|
64 | $r = 0; |
---|
65 | for ($j = 0; $j < 5; ++$j) |
---|
66 | $r = $r * 85 + $chn[$j]; |
---|
67 | $out .= chr($r >> 24); |
---|
68 | $out .= chr($r >> 16); |
---|
69 | $out .= chr($r >> 8); |
---|
70 | $out .= chr($r); |
---|
71 | } |
---|
72 | } |
---|
73 | $r = 0; |
---|
74 | |
---|
75 | if ($state == 1) |
---|
76 | $this->fpdi->error("Illegal length in ASCII85Decode."); |
---|
77 | if ($state == 2) { |
---|
78 | $r = $chn[0] * 85 * 85 * 85 * 85 + ($chn[1]+1) * 85 * 85 * 85; |
---|
79 | $out .= chr($r >> 24); |
---|
80 | } |
---|
81 | else if ($state == 3) { |
---|
82 | $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + ($chn[2]+1) * 85 * 85; |
---|
83 | $out .= chr($r >> 24); |
---|
84 | $out .= chr($r >> 16); |
---|
85 | } |
---|
86 | else if ($state == 4) { |
---|
87 | $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + $chn[2] * 85 * 85 + ($chn[3]+1) * 85 ; |
---|
88 | $out .= chr($r >> 24); |
---|
89 | $out .= chr($r >> 16); |
---|
90 | $out .= chr($r >> 8); |
---|
91 | } |
---|
92 | |
---|
93 | return $out; |
---|
94 | } |
---|
95 | } |
---|
96 | |
---|
97 | ?> |
---|