1 | <?php
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2 | //
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3 | // FPDI - Version 1.2
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4 | //
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5 | // Copyright 2004-2007 Setasign - Jan Slabon
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6 | //
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7 | // Licensed under the Apache License, Version 2.0 (the "License");
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8 | // you may not use this file except in compliance with the License.
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9 | // You may obtain a copy of the License at
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10 | //
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11 | // http://www.apache.org/licenses/LICENSE-2.0
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12 | //
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13 | // Unless required by applicable law or agreed to in writing, software
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14 | // distributed under the License is distributed on an "AS IS" BASIS,
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15 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 | // See the License for the specific language governing permissions and
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17 | // limitations under the License.
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18 | //
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19 |
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20 | if (!defined("ORD_z"))
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21 | define("ORD_z",ord('z'));
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22 | if (!defined("ORD_exclmark"))
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23 | define("ORD_exclmark", ord('!'));
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24 | if (!defined("ORD_u"))
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25 | define("ORD_u", ord("u"));
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26 | if (!defined("ORD_tilde"))
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27 | define("ORD_tilde", ord('~'));
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28 |
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29 | class ASCII85Decode {
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30 |
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31 | function ASCII85Decode(&$fpdi) {
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32 | $this->fpdi =& $fpdi;
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33 | }
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34 |
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35 |
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36 | function decode($in) {
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37 | $out = "";
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38 | $state = 0;
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39 | $chn = null;
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40 |
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41 | $l = strlen($in);
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42 |
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43 | for ($k = 0; $k < $l; ++$k) {
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44 | $ch = ord($in[$k]) & 0xff;
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45 |
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46 | if ($ch == ORD_tilde) {
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47 | break;
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48 | }
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49 | if (preg_match("/^\s$/",chr($ch))) {
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50 | continue;
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51 | }
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52 | if ($ch == ORD_z && $state == 0) {
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53 | $out .= chr(0).chr(0).chr(0).chr(0);
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54 | continue;
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55 | }
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56 | if ($ch < ORD_exclmark || $ch > ORD_u) {
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57 | $this->fpdi->error("Illegal character in ASCII85Decode.");
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58 | }
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59 |
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60 | $chn[$state++] = $ch - ORD_exclmark;
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61 |
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62 | if ($state == 5) {
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63 | $state = 0;
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64 | $r = 0;
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65 | for ($j = 0; $j < 5; ++$j)
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66 | $r = $r * 85 + $chn[$j];
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67 | $out .= chr($r >> 24);
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68 | $out .= chr($r >> 16);
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69 | $out .= chr($r >> 8);
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70 | $out .= chr($r);
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71 | }
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72 | }
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73 | $r = 0;
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74 |
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75 | if ($state == 1)
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76 | $this->fpdi->error("Illegal length in ASCII85Decode.");
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77 | if ($state == 2) {
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78 | $r = $chn[0] * 85 * 85 * 85 * 85 + ($chn[1]+1) * 85 * 85 * 85;
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79 | $out .= chr($r >> 24);
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80 | }
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81 | else if ($state == 3) {
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82 | $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + ($chn[2]+1) * 85 * 85;
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83 | $out .= chr($r >> 24);
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84 | $out .= chr($r >> 16);
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85 | }
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86 | else if ($state == 4) {
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87 | $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + $chn[2] * 85 * 85 + ($chn[3]+1) * 85 ;
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88 | $out .= chr($r >> 24);
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89 | $out .= chr($r >> 16);
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90 | $out .= chr($r >> 8);
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91 | }
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92 |
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93 | return $out;
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94 | }
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95 | }
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96 |
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97 | ?> |
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