BCGs25.barcode.php
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<?php
/**
*--------------------------------------------------------------------
*
* Sub-Class - Standard 2 of 5
*
* TODO I25 and S25 -> 1/3 or 1/2 for the big bar
*
*--------------------------------------------------------------------
* Copyright (C) Jean-Sebastien Goupil
* http://www.barcodephp.com
*/
include_once('BCGParseException.php');
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);
}
/**
* Sets if we display the checksum.
*
* @param bool $checksum
*/
public function setChecksum($checksum) {
$this->checksum = (bool)$checksum;
}
/**
* Draws the barcode.
*
* @param resource $im
*/
public function draw($im) {
$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, 0, 0, $this->positionX, $this->thickness);
}
/**
* Returns the maximal size of a barcode.
*
* @param int $w
* @param int $h
* @return int[]
*/
public function getDimension($w, $h) {
$c = strlen($this->text);
$startlength = 8;
$textlength = $c * 14;
$checksumlength = 0;
if ($c % 2 !== 0) {
$checksumlength = 14;
}
$endlength = 7;
$w += $startlength + $textlength + $checksumlength + $endlength;
$h += $this->thickness;
return parent::getDimension($w, $h);
}
/**
* Validates the input.
*/
protected function validate() {
$c = strlen($this->text);
if ($c === 0) {
throw new BCGParseException('s25', 'No data has been entered.');
}
// Checking if all chars are allowed
for ($i = 0; $i < $c; $i++) {
if (array_search($this->text[$i], $this->keys) === false) {
throw new BCGParseException('s25', 'The character \'' . $this->text[$i] . '\' is not allowed.');
}
}
// Must be even
if ($c % 2 !== 0 && $this->checksum === false) {
throw new BCGParseException('s25', 's25 must contain an even amount of digits if checksum is false.');
} elseif ($c % 2 === 0 && $this->checksum === true) {
throw new BCGParseException('s25', 's25 must contain an odd amount of digits if checksum is true.');
}
parent::validate();
}
/**
* 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;
}
}
?>