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<?php |
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// |
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// FPDI - Version 1.2 |
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// |
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// Copyright 2004-2007 Setasign - Jan Slabon |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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|
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if (!defined("ORD_z")) |
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define("ORD_z",ord('z')); |
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if (!defined("ORD_exclmark")) |
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define("ORD_exclmark", ord('!')); |
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if (!defined("ORD_u")) |
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define("ORD_u", ord("u")); |
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if (!defined("ORD_tilde")) |
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define("ORD_tilde", ord('~')); |
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|
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class ASCII85Decode { |
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|
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function ASCII85Decode(&$fpdi) { |
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$this->fpdi =& $fpdi; |
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} |
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|
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|
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function decode($in) { |
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$out = ""; |
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$state = 0; |
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$chn = null; |
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|
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$l = strlen($in); |
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|
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for ($k = 0; $k < $l; ++$k) { |
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$ch = ord($in[$k]) & 0xff; |
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|
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if ($ch == ORD_tilde) { |
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break; |
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} |
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if (preg_match("/^\s$/",chr($ch))) { |
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continue; |
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} |
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if ($ch == ORD_z && $state == 0) { |
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$out .= chr(0).chr(0).chr(0).chr(0); |
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continue; |
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} |
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if ($ch < ORD_exclmark || $ch > ORD_u) { |
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$this->fpdi->error("Illegal character in ASCII85Decode."); |
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} |
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|
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$chn[$state++] = $ch - ORD_exclmark; |
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|
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if ($state == 5) { |
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$state = 0; |
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$r = 0; |
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for ($j = 0; $j < 5; ++$j) |
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$r = $r * 85 + $chn[$j]; |
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$out .= chr($r >> 24); |
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$out .= chr($r >> 16); |
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$out .= chr($r >> 8); |
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$out .= chr($r); |
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} |
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} |
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$r = 0; |
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|
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if ($state == 1) |
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$this->fpdi->error("Illegal length in ASCII85Decode."); |
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if ($state == 2) { |
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$r = $chn[0] * 85 * 85 * 85 * 85 + ($chn[1]+1) * 85 * 85 * 85; |
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$out .= chr($r >> 24); |
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} |
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else if ($state == 3) { |
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$r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + ($chn[2]+1) * 85 * 85; |
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$out .= chr($r >> 24); |
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$out .= chr($r >> 16); |
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} |
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else if ($state == 4) { |
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$r = $chn[0] * 85 * 85 * 85 * 85 + $chn[1] * 85 * 85 * 85 + $chn[2] * 85 * 85 + ($chn[3]+1) * 85 ; |
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$out .= chr($r >> 24); |
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$out .= chr($r >> 16); |
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$out .= chr($r >> 8); |
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} |
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|
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return $out; |
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} |
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} |
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|
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?> |
