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1 <?php |
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2 /** |
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3 * Zend Framework |
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4 * |
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5 * LICENSE |
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6 * |
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7 * This source file is subject to the new BSD license that is bundled |
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8 * with this package in the file LICENSE.txt. |
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9 * It is also available through the world-wide-web at this URL: |
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10 * http://framework.zend.com/license/new-bsd |
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11 * If you did not receive a copy of the license and are unable to |
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12 * obtain it through the world-wide-web, please send an email |
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13 * to license@zend.com so we can send you a copy immediately. |
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14 * |
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15 * @category Zend |
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16 * @package Zend_Validate |
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17 * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) |
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18 * @license http://framework.zend.com/license/new-bsd New BSD License |
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19 * @version $Id: Issn.php 20785 2010-01-31 09:43:03Z mikaelkael $ |
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20 */ |
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21 |
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22 /** |
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23 * @see Zend_Validate_Barcode_AdapterAbstract |
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24 */ |
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25 require_once 'Zend/Validate/Barcode/AdapterAbstract.php'; |
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26 |
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27 /** |
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28 * @category Zend |
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29 * @package Zend_Validate |
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30 * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) |
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31 * @license http://framework.zend.com/license/new-bsd New BSD License |
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32 */ |
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33 class Zend_Validate_Barcode_Issn extends Zend_Validate_Barcode_AdapterAbstract |
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34 { |
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35 /** |
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36 * Allowed barcode lengths |
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37 * @var integer |
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38 */ |
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39 protected $_length = array(8, 13); |
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40 |
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41 /** |
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42 * Allowed barcode characters |
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43 * @var string |
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44 */ |
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45 protected $_characters = '0123456789X'; |
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46 |
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47 /** |
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48 * Checksum function |
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49 * @var string |
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50 */ |
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51 protected $_checksum = '_gtin'; |
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52 |
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53 /** |
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54 * Allows X on length of 8 chars |
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55 * |
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56 * @param string $value The barcode to check for allowed characters |
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57 * @return boolean |
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58 */ |
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59 public function checkChars($value) |
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60 { |
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61 if (strlen($value) != 8) { |
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62 if (strpos($value, 'X') !== false) { |
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63 return false; |
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64 } |
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65 } |
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66 |
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67 return parent::checkChars($value); |
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68 } |
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69 |
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70 /** |
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71 * Validates the checksum |
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72 * |
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73 * @param string $value The barcode to check the checksum for |
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74 * @return boolean |
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75 */ |
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76 public function checksum($value) |
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77 { |
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78 if (strlen($value) == 8) { |
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79 $this->_checksum = '_issn'; |
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80 } else { |
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81 $this->_checksum = '_gtin'; |
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82 } |
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83 |
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84 return parent::checksum($value); |
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85 } |
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86 |
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87 /** |
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88 * Validates the checksum () |
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89 * ISSN implementation (reversed mod11) |
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90 * |
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91 * @param string $value The barcode to validate |
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92 * @return boolean |
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93 */ |
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94 protected function _issn($value) |
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95 { |
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96 $checksum = substr($value, -1, 1); |
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97 $values = str_split(substr($value, 0, -1)); |
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98 $check = 0; |
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99 $multi = 8; |
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100 foreach($values as $token) { |
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101 if ($token == 'X') { |
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102 $token = 10; |
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103 } |
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104 |
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105 $check += ($token * $multi); |
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106 --$multi; |
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107 } |
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108 |
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109 $check %= 11; |
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110 $check = 11 - $check; |
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111 if ($check == $checksum) { |
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112 return true; |
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113 } else if (($check == 10) && ($checksum == 'X')) { |
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114 return true; |
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115 } |
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116 |
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117 return false; |
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118 } |
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119 } |