97 lines
2.8 KiB
PHP
97 lines
2.8 KiB
PHP
<?php
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//
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// FPDI - Version 1.1
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//
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// Copyright 2004,2005 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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if (!defined("ORD_z"))
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define("ORD_z",ord('z'));
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if (!defined("ORD_!"))
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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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class ASCII85Decode {
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function ASCII85Decode(&$fpdi) {
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$this->fpdi =& $fpdi;
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}
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function decode($in) {
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$out = "";
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$state = 0;
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$chn = null;
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$l = strlen($in);
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for ($k = 0; $k < $l; ++$k) {
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$ch = ord($in[$k]) & 0xff;
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if ($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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$chn[$state++] = $ch - ORD_exclmark;
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if ($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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$r = 0;
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if ($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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return $out;
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}
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}
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?>
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