<?php
/**************************************************
 *             Kody kreskowe - 2 of 5             *
 **************************************************
 * Wersja: 1.0                                    *
 * Autor: Jacek Kowalski (http://jacekk.info)     *
 *                                                *
 * Utwór rozprowadzany na licencji                *
 * http://creativecommons.org/licenses/by-nc/2.5/ *
 **************************************************/

if(trim($_GET['kod'], '0123456789')!='') {
	echo 'Znaki inne niż cyfry';
	die();
}


$code = array(
	'start' => '111101111010',
	'0' => '1010111101111010',
	'1' => '1111010101011110',
	'2' => '1011110101011110',
	'3' => '1111011110101010',
	'4' => '1010111101011110',
	'5' => '1111010111101010',
	'6' => '1011110111101010',
	'7' => '1010101111011110',
	'8' => '1111010101111010',
	'9' => '1011110101111010',
	'stop' => '111101011110'
);


function gen_binary($kod) {
	global $code;

	$kod = str_split($kod);
	$ret = '';
	foreach($kod as $val) {
		$ret .= $code[$val];
	}
	return $ret;
}
function print_code($kod, $img) {
	global $b, $w;

	$kod = str_split($kod);
	foreach($kod as $val) {
		if($val==1) {
			imageline($img, $now, 0, $now, 40, $b);
			$now++;
		}
		elseif($val==0) {
			$now++;
		}
	}
}

$kod = $code['start'].gen_binary($_GET['kod']).$code['stop'];

$i = imagecreate(strlen($kod), 40);
$w = imagecolorallocate($i, 255, 255, 255);
$b = imagecolorallocate($i, 0, 0, 0);

print_code($kod, $i);

header('Content-type: image/gif');
imagegif($i);
?>