root / drupal7 / sites / all / libraries / fpdi-1.5.4 / filters / FilterASCII85.php @ 7295e063
1 | 60370e04 | Assos Assos | <?php
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2 | //
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3 | // FPDI - Version 1.5.4
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4 | //
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5 | // Copyright 2004-2015 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 | |||
20 | /**
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21 | * Class FilterASCII85
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22 | */
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23 | class FilterASCII85 |
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24 | { |
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25 | /**
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26 | * Decode ASCII85 encoded string
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27 | *
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28 | * @param string $in
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29 | * @return string
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30 | * @throws Exception
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31 | */
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32 | public function decode($in) |
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33 | { |
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34 | $ord = array( |
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35 | '~' => ord('~'), |
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36 | 'z' => ord('z'), |
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37 | 'u' => ord('u'), |
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38 | '!' => ord('!') |
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39 | ); |
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40 | |||
41 | $out = ''; |
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42 | $state = 0; |
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43 | $chn = null; |
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44 | |||
45 | $l = strlen($in); |
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46 | |||
47 | for ($k = 0; $k < $l; ++$k) { |
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48 | $ch = ord($in[$k]) & 0xff; |
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49 | |||
50 | if ($ch == $ord['~']) { |
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51 | break;
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52 | } |
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53 | if (preg_match('/^\s$/',chr($ch))) { |
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54 | continue;
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55 | } |
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56 | if ($ch == $ord['z'] && $state == 0) { |
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57 | $out .= chr(0) . chr(0) . chr(0) . chr(0); |
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58 | continue;
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59 | } |
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60 | if ($ch < $ord['!'] || $ch > $ord['u']) { |
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61 | throw new Exception('Illegal character in ASCII85Decode.'); |
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62 | } |
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63 | |||
64 | $chn[$state++] = $ch - $ord['!']; |
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65 | |||
66 | if ($state == 5) { |
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67 | $state = 0; |
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68 | $r = 0; |
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69 | for ($j = 0; $j < 5; ++$j) |
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70 | $r = $r * 85 + $chn[$j]; |
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71 | $out .= chr($r >> 24); |
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72 | $out .= chr($r >> 16); |
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73 | $out .= chr($r >> 8); |
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74 | $out .= chr($r); |
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75 | } |
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76 | } |
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77 | $r = 0; |
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78 | |||
79 | if ($state == 1) { |
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80 | throw new Exception('Illegal length in ASCII85Decode.'); |
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81 | } |
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82 | |||
83 | if ($state == 2) { |
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84 | $r = $chn[0] * 85 * 85 * 85 * 85 + ($chn[1]+1) * 85 * 85 * 85; |
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85 | $out .= chr($r >> 24); |
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86 | |||
87 | } else if ($state == 3) { |
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88 | $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + ($chn[2]+1) * 85 * 85; |
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89 | $out .= chr($r >> 24); |
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90 | $out .= chr($r >> 16); |
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91 | |||
92 | } else if ($state == 4) { |
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93 | $r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + $chn[2] * 85 * 85 + ($chn[3]+1) * 85 ; |
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94 | $out .= chr($r >> 24); |
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95 | $out .= chr($r >> 16); |
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96 | $out .= chr($r >> 8); |
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97 | } |
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98 | |||
99 | return $out; |
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100 | } |
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101 | |||
102 | /**
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103 | * NOT IMPLEMENTED
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104 | *
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105 | * @param string $in
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106 | * @return string
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107 | * @throws LogicException
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108 | */
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109 | public function encode($in) |
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110 | { |
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111 | throw new LogicException("ASCII85 encoding not implemented."); |
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112 | } |
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113 | } |