<?
include "pre-head.php";

if ( $_GET["file"] == "cenik_mesto_xls" ) {
   $soubor = "0_Cenik_HK_mesto.xls";
} elseif ( $_GET["file"] == "cenik_okoli_xls" ) {
   $soubor = "0_Cenik_okoli_HK.xls";
} elseif ( $_GET["file"] == "cenik_delsi_xls" ) {
   $soubor = "0_Cenik_delsi_jizdy.xls";
} else {
   if ( $_SESSION["user_id"] != "" ) { // logged only
      $soubor = $_GET["file"];
   }
}

//header("Content-type: text; charset=utf-8");
//header("Content-Disposition: attachment; filename=".basename($soubor)."");
//readfile($soubor);

function _output_file($file, $path, $saveas)         // $saveas added by krasl
	{
		$size = filesize($path.$file);
		
		@ob_end_clean(); //turn off output buffering to decrease cpu usage
		
		// required for IE, otherwise Content-Disposition may be ignored
		if(ini_get('zlib.output_compression'))
		ini_set('zlib.output_compression', 'Off');
		
		header('Content-Type: application/force-download');
		//header('Content-Disposition: attachment; filename="'.basename($file).'"');
		header('Content-Disposition: attachment; filename="'.$saveas.'"');
		header("Content-Transfer-Encoding: binary");
		header('Accept-Ranges: bytes');
		
		/* The three lines below basically make the 
		download non-cacheable */
		header("Cache-control: no-cache, pre-check=0, post-check=0");
		header("Cache-control: private");
		header('Pragma: private');
		header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
		
		// multipart-download and download resuming support
		if(isset($_SERVER['HTTP_RANGE']))
		{
			list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2);
			list($range) = explode(",",$range,2);
			list($range, $range_end) = explode("-", $range);
			$range=intval($range);
			if(!$range_end) {
				$range_end=$size-1;
			} else {
				$range_end=intval($range_end);
			}
			
			$new_length = $range_end-$range+1;
			header("HTTP/1.1 206 Partial Content");
			header("Content-Length: $new_length");
			header("Content-Range: bytes $range-$range_end/$size");
		} else {
			$new_length=$size;
			header("Content-Length: ".$size);
		}
		
		/* output the file itself */
		$chunksize = 1*(1024*1024); //you may want to change this
		$bytes_send = 0;
		if ($file = fopen($path.$file, 'rb'))
		{
			if(isset($_SERVER['HTTP_RANGE']))
			fseek($file, $range);
			
			while
				(!feof($file) && 
				 (!connection_aborted()) && 
				 ($bytes_send<$new_length) )
			{
				$buffer = fread($file, $chunksize);
				print($buffer); //echo($buffer); // is also possible
				flush();
				$bytes_send += strlen($buffer);
			}
		fclose($file);
		} else die('Error - can not open file.');
	 
	die();
}
function download_file($filename) {
		/* DOWNLOAD */
		$path = "files/"; //directory
		//track Google Analytics !
		//include('includes/Galvanize.php'); // great plugin http://sourceforge.net/projects/galvanize/
		//$GA = new Galvanize('UA-XXXXXXX-7');
		//$GA->trackPageView();
		//$this->_output_file($filename, $path);
		_output_file($filename, $path);
}
//download_file($soubor);
_output_file( $soubor, "files/", str_replace("0_","TAXI_Sprint_",$soubor) );

?>