<?php
/**************************************************
 *            Kody kreskowe - Codabar             *
 **************************************************
 * 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 i +-:/.$';
	die();
}

$code = array(
	'SS' => '1011110000100001',
	'BT' => '0',
	'0' => '1010100001111',
	'1' => '1010111100001',
	'2' => '1010000101111',
	'3' => '1111000010101',
	'4' => '1011110100001',
	'5' => '1111010100001',
	'6' => '1000010101111',
	'7' => '1000010111101',
	'8' => '1000011110101',
	'9' => '1111010000101',
	'-' => '1010000111101',
	'$' => '1011110000101',
	':' => '1111010111101111',
	'/' => '1111011110101111',
	'.' => '1111011110111101',
	'+' => '1011110111101111'
);


function gen_binary($kod) {
	global $code, $kol;

	$kod = str_split($kod);
	$ret = '';
	foreach($kod as $key => $val) {
		$ret .= $code[$val].$code['BT'];
	}

	return $ret;
}
function print_code($kod, $img) {
	global $b, $w, $now;

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

$_GET['kod'] = $code['SS'].$code['BT'].gen_binary($_GET['kod']).$code['SS'];

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

print_code($_GET['kod'], $i);

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