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<?php
/**
*--------------------------------------------------------------------
*
* Sub-Class - ISBN-10 and ISBN-13
*
* You can provide an ISBN with 10 digits with or without the checksum.
* You can provide an ISBN with 13 digits with or without the checksum.
* Calculate the ISBN based on the EAN-13 encoding.
*
* The checksum is always displayed.
*
*--------------------------------------------------------------------
* Copyright (C) Jean-Sebastien Goupil
* http://www.barcodephp.com
*/
include_once('BCGParseException.php');
include_once('BCGArgumentException.php');
include_once('BCGean13.barcode.php');
class BCGisbn extends BCGean13 {
const GS1_AUTO = 0;
const GS1_PREFIX978 = 1;
const GS1_PREFIX979 = 2;
private $gs1;
/**
* Constructor.
*
* @param int $gs1
*/
public function __construct($gs1 = self::GS1_AUTO) {
parent::__construct();
$this->setGS1($gs1);
}
/**
* Adds the default label.
*/
protected function addDefaultLabel() {
if ($this->isDefaultEanLabelEnabled()) {
$isbn = $this->createISBNText();
$font = $this->font;
$topLabel = new BCGLabel($isbn, $font, BCGLabel::POSITION_TOP, BCGLabel::ALIGN_CENTER);
$this->addLabel($topLabel);
}
parent::addDefaultLabel();
}
/**
* Sets the first numbers of the barcode.
* - GS1_AUTO: Adds 978 before the code
* - GS1_PREFIX978: Adds 978 before the code
* - GS1_PREFIX979: Adds 979 before the code
*
* @param int $gs1
*/
public function setGS1($gs1) {
$gs1 = (int)$gs1;
if ($gs1 !== self::GS1_AUTO && $gs1 !== self::GS1_PREFIX978 && $gs1 !== self::GS1_PREFIX979) {
throw new BCGArgumentException('The GS1 argument must be BCGisbn::GS1_AUTO, BCGisbn::GS1_PREFIX978, or BCGisbn::GS1_PREFIX979', 'gs1');
}
$this->gs1 = $gs1;
}
/**
* Check chars allowed.
*/
protected function checkCharsAllowed() {
$c = strlen($this->text);
// Special case, if we have 10 digits, the last one can be X
if ($c === 10) {
if (array_search($this->text[9], $this->keys) === false && $this->text[9] !== 'X') {
throw new BCGParseException('isbn', 'The character \'' . $this->text[9] . '\' is not allowed.');
}
// Drop the last char
$this->text = substr($this->text, 0, 9);
}
return parent::checkCharsAllowed();
}
/**
* Check correct length.
*/
protected function checkCorrectLength() {
$c = strlen($this->text);
// If we have 13 chars just flush the last one
if ($c === 13) {
$this->text = substr($this->text, 0, 12);
} elseif ($c === 9 || $c === 10) {
if ($c === 10) {
// Before dropping it, we check if it's legal
if (array_search($this->text[9], $this->keys) === false && $this->text[9] !== 'X') {
throw new BCGParseException('isbn', 'The character \'' . $this->text[9] . '\' is not allowed.');
}
$this->text = substr($this->text, 0, 9);
}
if ($this->gs1 === self::GS1_AUTO || $this->gs1 === self::GS1_PREFIX978) {
$this->text = '978' . $this->text;
} elseif ($this->gs1 === self::GS1_PREFIX979) {
$this->text = '979' . $this->text;
}
} elseif ($c !== 12) {
throw new BCGParseException('isbn', 'The code parsed must be 9, 10, 12, or 13 digits long.');
}
}
/**
* Creates the ISBN text.
*
* @return string
*/
private function createISBNText() {
$isbn = '';
if (!empty($this->text)) {
// We try to create the ISBN Text... the hyphen really depends the ISBN agency.
// We just put one before the checksum and one after the GS1 if present.
$c = strlen($this->text);
if ($c === 12 || $c === 13) {
// If we have 13 characters now, just transform it temporarily to find the checksum...
// Further in the code we take care of that anyway.
$lastCharacter = '';
if ($c === 13) {
$lastCharacter = $this->text[12];
$this->text = substr($this->text, 0, 12);
}
$checksum = $this->processChecksum();
$isbn = 'ISBN ' . substr($this->text, 0, 3) . '-' . substr($this->text, 3, 9) . '-' . $checksum;
// Put the last character back
if ($c === 13) {
$this->text .= $lastCharacter;
}
} elseif ($c === 9 || $c === 10) {
$checksum = 0;
for ($i = 10; $i >= 2; $i--) {
$checksum += $this->text[10 - $i] * $i;
}
$checksum = 11 - $checksum % 11;
if ($checksum === 10) {
$checksum = 'X'; // Changing type
}
$isbn = 'ISBN ' . substr($this->text, 0, 9) . '-' . $checksum;
}
}
return $isbn;
}
}
?>