Revise paste 7fcca47719a33

<?php
session_start();
$_GET['r']=1;
$_GET['t']=20;
$_GET['code']="code128";
$_GET['o']=1;
$_GET['a1']="B";
$_GET['a2']="";
$_GET['f']="2";
if(isset($_SESSION[barcode_text])){
  $_GET['text']=$_SESSION[barcode_text];   
}
else if(isset($_GET['bc'])){
  $_GET['text']=$_GET['bc'];  
}
else{
  $_GET['text']="undefined";
}

if(isset($_GET['code']) && isset($_GET['t']) && isset($_GET['r']) && isset($_GET['text']) && isset($_GET['f']) && isset($_GET['o']) && isset($_GET['a1']) && isset($_GET['a2'])){
	define('IN_CB',true);
	require('index.php');
	require('FColor.php');
	require('BarCode.php');
	require('FDrawing.php');
	if(include(''.$_GET['code'].'.barcode.php')){
		$color_black = new FColor(0,0,0);
		$color_white = new FColor(255,255,255);
		if(!empty($_GET['a2']))
			$code_generated = new $_GET['code']($_GET['t'],$color_black,$color_white,$_GET['r'],$_GET['text'],$_GET['f'],$_GET['a1'],$_GET['a2']);
		elseif(!empty($_GET['a1']))
			$code_generated = new $_GET['code']($_GET['t'],$color_black,$color_white,$_GET['r'],$_GET['text'],$_GET['f'],$_GET['a1']);
		else
			$code_generated = new $_GET['code']($_GET['t'],$color_black,$color_white,$_GET['r'],$_GET['text'],$_GET['f']);
		$drawing = new FDrawing(1024,1024,'',$color_white);
		$drawing->init();
		$drawing->add_barcode($code_generated);
		$drawing->draw_all();
		$im = $drawing->get_im();
		$im2 = imagecreate($code_generated->lastX,$code_generated->lastY);
		imagecopyresized($im2, $im, 0, 0, 0, 0, $code_generated->lastX, $code_generated->lastY, $code_generated->lastX, $code_generated->lastY);
		$drawing->set_im($im2);
		$drawing->finish($_GET['o']);
	}
	else{
		header('Content: image/png');
		readfile('error.png');
	}
}
else{
	header('Content: image/png');
	readfile('error.png');
}
?>