Code39.php

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<?php
#require_once 'Zend/Validate/Barcode/AdapterAbstract.php';

class Zend_Validate_Barcode_Code39 extends Zend_Validate_Barcode_AdapterAbstract
{
    protected $_length = -1;

    protected $_characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ -.$/+%';

    protected $_checksum = '_code39';

    protected $_check = array(
        '0' =>  0, '1' =>  1, '2' =>  2, '3' =>  3, '4' =>  4, '5' =>  5, '6' =>  6,
        '7' =>  7, '8' =>  8, '9' =>  9, 'A' => 10, 'B' => 11, 'C' => 12, 'D' => 13,
        'E' => 14, 'F' => 15, 'G' => 16, 'H' => 17, 'I' => 18, 'J' => 19, 'K' => 20,
        'L' => 21, 'M' => 22, 'N' => 23, 'O' => 24, 'P' => 25, 'Q' => 26, 'R' => 27,
        'S' => 28, 'T' => 29, 'U' => 30, 'V' => 31, 'W' => 32, 'X' => 33, 'Y' => 34,
        'Z' => 35, '-' => 36, '.' => 37, ' ' => 38, '$' => 39, '/' => 40, '+' => 41,
        '%' => 42,
    );

    public function __construct()
    {
        $this->setCheck(false);
    }

    protected function _code39($value)
    {
        $checksum = substr($value, -1, 1);
        $value    = str_split(substr($value, 0, -1));
        $count    = 0;
        foreach($value as $char) {
            $count += $this->_check[$char];
        }

        $mod = $count % 43;
        if ($mod == $this->_check[$checksum]) {
            return true;
        }

        return false;
    }
}