lib/Barcode.class.php

   1 <?php
   2 /*
   3  * Barcode Class
   4  * Copyright (C) 2011  Thomas Mudrunka
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU Affero General Public License as
   8  * published by the Free Software Foundation, either version 3 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 /**
  21 * Trida implementuje funkce pro praci s carovymi kody
  22 *
  23 * @package  Barcode
  24 * @author   Tomas Mudrunka
  25 */
  26 class Barcode {
  27         static function test() {
  28                 system('barcode -b test | convert - /dev/null', $ret);
  29                 if($ret == 0) {
  30                         return true;
  31                 } else {
  32                         trigger_error('Barcode-related features are disabled. Please install GNU Barcode and ImageMagick.');
  33                         return false;
  34                 }
  35         }
  36
  37         static function generate_barcode($string='EXAMPLE', $convert='png', $enctype='code128b') {
  38                 $string = escapeshellarg($string);
  39                 $enctype = escapeshellarg($enctype);
  40                 $convert = $convert ? " | convert - -crop 0x60+0+30\\! -background white -flatten $convert:-" : '';
  41                 return shell_exec("barcode -e $enctype -E -b $string$convert");
  42         }
  43
  44         static function cached_barcode($string='EXAMPLE', $convert='png', $enctype='code128b') {
  45                 $ext = $convert ? $convert : 'ps';
  46                 $filename=DIR_BARCODES."/$enctype-".urlencode($string).".$ext";
  47                 if(is_file($filename)) return file_get_contents($filename);
  48                 $barcode = self::generate_barcode($string,$convert,$enctype);
  49                 file_put_contents($filename,$barcode);
  50                 return $barcode;
  51         }
  52
  53         static function download_barcode($string='EXAMPLE', $convert='png', $enctype='code128b') {
  54                 if(self::test()) {
  55                         header('Content-Type: image/png');
  56                         header('Cache-Control: max-age=604800, public'); //1week caching
  57                 }       else die();
  58                 die(self::cached_barcode($string,$convert,$enctype));
  59         }
  60 }