CasperSecurity
<?php
/**
*--------------------------------------------------------------------
*
* Sub-Class - EAN-8
*
* EAN-8 contains
* - 4 digits
* - 3 digits
* - 1 checksum
*
* The checksum is always displayed.
*
*--------------------------------------------------------------------
* Copyright (C) Jean-Sebastien Goupil
* http://www.barcodephp.com
*/
include_once('BCGParseException.php');
include_once('BCGBarcode1D.php');
class BCGean8 extends BCGBarcode1D {
protected $labelLeft = null;
protected $labelRight = null;
/**
* Constructor.
*/
public function __construct() {
parent::__construct();
$this->keys = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9');
// Left-Hand Odd Parity starting with a space
// Right-Hand is the same of Left-Hand starting with a bar
$this->code = array(
'2100', /* 0 */
'1110', /* 1 */
'1011', /* 2 */
'0300', /* 3 */
'0021', /* 4 */
'0120', /* 5 */
'0003', /* 6 */
'0201', /* 7 */
'0102', /* 8 */
'2001' /* 9 */
);
}
/**
* Draws the barcode.
*
* @param resource $im
*/
public function draw($im) {
$c = strlen($this->text);
// Checksum
$this->calculateChecksum();
$temp_text = $this->text . $this->keys[$this->checksumValue];
// Starting Code
$this->drawChar($im, '000', true);
// Draw First 4 Chars (Left-Hand)
for ($i = 0; $i < 4; $i++) {
$this->drawChar($im, $this->findCode($temp_text[$i]), false);
}
// Draw Center Guard Bar
$this->drawChar($im, '00000', false);
// Draw Last 4 Chars (Right-Hand)
for ($i = 4; $i < 8; $i++) {
$this->drawChar($im, $this->findCode($temp_text[$i]), true);
}
// Draw Right Guard Bar
$this->drawChar($im, '000', true);
$this->drawText($im, 0, 0, $this->positionX, $this->thickness);
if ($this->isDefaultEanLabelEnabled()) {
$dimension = $this->labelRight->getDimension();
$this->drawExtendedBars($im, $dimension[1] - 2);
}
}
/**
* Returns the maximal size of a barcode.
*
* @param int $w
* @param int $h
* @return int[]
*/
public function getDimension($w, $h) {
$startlength = 3;
$centerlength = 5;
$textlength = 8 * 7;
$endlength = 3;
$w += $startlength + $centerlength + $textlength + $endlength;
$h += $this->thickness;
return parent::getDimension($w, $h);
}
/**
* Adds the default label.
*/
protected function addDefaultLabel() {
if ($this->isDefaultEanLabelEnabled()) {
$this->processChecksum();
$label = $this->getLabel();
$font = $this->font;
$this->labelLeft = new BCGLabel(substr($label, 0, 4), $font, BCGLabel::POSITION_BOTTOM, BCGLabel::ALIGN_LEFT);
$labelLeftDimension = $this->labelLeft->getDimension();
$this->labelLeft->setOffset(($this->scale * 30 - $labelLeftDimension[0]) / 2 + $this->scale * 2);
$this->labelRight = new BCGLabel(substr($label, 4, 3) . $this->keys[$this->checksumValue], $font, BCGLabel::POSITION_BOTTOM, BCGLabel::ALIGN_LEFT);
$labelRightDimension = $this->labelRight->getDimension();
$this->labelRight->setOffset(($this->scale * 30 - $labelRightDimension[0]) / 2 + $this->scale * 34);
$this->addLabel($this->labelLeft);
$this->addLabel($this->labelRight);
}
}
/**
* Checks if the default ean label is enabled.
*
* @return bool
*/
protected function isDefaultEanLabelEnabled() {
$label = $this->getLabel();
$font = $this->font;
return $label !== null && $label !== '' && $font !== null && $this->defaultLabel !== null;
}
/**
* Validates the input.
*/
protected function validate() {
$c = strlen($this->text);
if ($c === 0) {
throw new BCGParseException('ean8', 'No data has been entered.');
}
// Checking if all chars are allowed
for ($i = 0; $i < $c; $i++) {
if (array_search($this->text[$i], $this->keys) === false) {
throw new BCGParseException('ean8', 'The character \'' . $this->text[$i] . '\' is not allowed.');
}
}
// If we have 8 chars just flush the last one
if ($c === 8) {
$this->text = substr($this->text, 0, 7);
} elseif ($c !== 7) {
throw new BCGParseException('ean8', 'Must contain 7 digits, the 8th digit is automatically added.');
}
parent::validate();
}
/**
* Overloaded method to calculate checksum.
*/
protected function calculateChecksum() {
// Calculating Checksum
// Consider the right-most digit of the message to be in an "odd" position,
// and assign odd/even to each character moving from right to left
// Odd Position = 3, Even Position = 1
// Multiply it by the number
// Add all of that and do 10-(?mod10)
$odd = true;
$this->checksumValue = 0;
$c = strlen($this->text);
for ($i = $c; $i > 0; $i--) {
if ($odd === true) {
$multiplier = 3;
$odd = false;
} else {
$multiplier = 1;
$odd = true;
}
if (!isset($this->keys[$this->text[$i - 1]])) {
return;
}
$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;
}
/**
* Draws the extended bars on the image.
*
* @param resource $im
* @param int $plus
*/
private function drawExtendedBars($im, $plus) {
$rememberX = $this->positionX;
$rememberH = $this->thickness;
// We increase the bars
$this->thickness = $this->thickness + intval($plus / $this->scale);
$this->positionX = 0;
$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
$this->positionX += 2;
$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
$code1 = $this->positionX;
// Center Guard Bar
$this->positionX += 30;
$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
$this->positionX += 2;
$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
// Last Bars
$this->positionX += 30;
$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
$this->positionX += 2;
$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
$this->positionX = $rememberX;
$this->thickness = $rememberH;
}
}
?>