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<?php
/**
* BCGs25.barcode.php
*--------------------------------------------------------------------
*
* Sub-Class - Standard 2 of 5
*
* NOTE: It is really tough to read this barcode !
*
*--------------------------------------------------------------------
* Revision History
* v2.0.0 23 apr 2008 Jean-Sébastien Goupil New Version Update
* v1.2.3b 31 dec 2005 Jean-Sébastien Goupil Checksum separated + PHP5.1 compatible
* v1.2.2 23 jul 2005 Jean-Sébastien Goupil Correct Checksum
* v1.2.1 27 jun 2005 Jean-Sébastien Goupil Font support added
* V1.00 17 jun 2004 Jean-Sebastien Goupil
*--------------------------------------------------------------------
* $Id: BCGs25.barcode.php,v 1.10 2009/11/09 04:08:41 jsgoupil Exp $
*--------------------------------------------------------------------
* Copyright (C) Jean-Sebastien Goupil
* http://www.barcodephp.com
*/
include_once('BCGBarcode1D.php');
class BCGs25 extends BCGBarcode1D {
private $checksum;
/**
* Constructor
*/
public function __construct() {
parent::__construct();
$this->keys = array('0','1','2','3','4','5','6','7','8','9');
$this->code = array(
'0000202000', /* 0 */
'2000000020', /* 1 */
'0020000020', /* 2 */
'2020000000', /* 3 */
'0000200020', /* 4 */
'2000200000', /* 5 */
'0020200000', /* 6 */
'0000002020', /* 7 */
'2000002000', /* 8 */
'0020002000' /* 9 */
);
$this->setChecksum(false);
}
public function setChecksum($checksum) {
$this->checksum = (bool)$checksum;
}
/**
* Draws the barcode
*
* @param resource $im
*/
public function draw(&$im) {
$error_stop = false;
// Checking if all chars are allowed
$c = strlen($this->text);
for($i = 0; $i < $c; $i++) {
if(array_search($this->text[$i], $this->keys) === false) {
$this->drawError($im, 'Char \'' . $this->text[$i] . '\' not allowed.');
$error_stop = true;
}
}
if($error_stop === false) {
// Must be even
if($c % 2 !== 0 && $this->checksum === false) {
$this->drawError($im, 's25 must be even if checksum is false.');
$error_stop = true;
} elseif($c % 2 === 0 && $this->checksum === true) {
$this->drawError($im, 's25 must be odd if checksum is true.');
$error_stop = true;
}
if($error_stop === false) {
$temp_text = $this->text;
// Checksum
if($this->checksum === true) {
$this->calculateChecksum();
$temp_text .= $this->keys[$this->checksumValue];
}
// Starting Code
$this->drawChar($im, '101000', true);
// Chars
$c = strlen($temp_text);
for($i = 0; $i < $c; $i++) {
$this->drawChar($im, $this->findCode($temp_text[$i]), true);
}
// Ending Code
$this->drawChar($im, '10001', true);
$this->drawText($im);
}
}
}
/**
* Returns the maximal size of a barcode
*
* @return int[]
*/
public function getMaxSize() {
$p = parent::getMaxSize();
$c = strlen($this->text);
$startlength = 8 * $this->scale;
$textlength = $c * 14 * $this->scale;
$checksumlength = 0;
if($c % 2 !== 0) {
$checksumlength = 14 * $this->scale;
}
$endlength = 7 * $this->scale;
return array($p[0] + $startlength + $textlength + $checksumlength + $endlength, $p[1]);
}
/**
* Overloaded method to calculate checksum
*/
protected function calculateChecksum() {
// Calculating Checksum
// Consider the right-most digit of the message to be in an "even" position,
// and assign odd/even to each character moving from right to left
// Even Position = 3, Odd Position = 1
// Multiply it by the number
// Add all of that and do 10-(?mod10)
$even = true;
$this->checksumValue = 0;
$c = strlen($this->text);
for($i = $c; $i > 0; $i--) {
if($even === true) {
$multiplier = 3;
$even = false;
} else {
$multiplier = 1;
$even = true;
}
$this->checksumValue += $this->keys[$this->text[$i - 1]] * $multiplier;
}
$this->checksumValue = (10 - $this->checksumValue % 10) % 10;
}
/**
* Overloaded method to display the checksum
*/
protected function processChecksum() {
if($this->checksumValue === false) { // Calculate the checksum only once
$this->calculateChecksum();
}
if($this->checksumValue !== false) {
return $this->keys[$this->checksumValue];
}
return false;
}
};
?>
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