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PHP Quellcode

function dl_file_resume($file){
 
//First, see if the file exists
if (!is_file($file)) { die("[b]404 File not found![/b]"); }
 
//Gather relevent info about file
$len = filesize($file);
$filename = basename($file);
$file_extension = strtolower(substr(strrchr($filename,"."),1));
//This will set the Content-Type to the appropriate setting for the file
switch( $file_extension ) {
case "exe": $ctype="application/octet-stream"; break;
case "zip": $ctype="application/zip"; break;
case "mp3": $ctype="audio/mpeg"; break;
case "mpg":$ctype="video/mpeg"; break;
case "avi": $ctype="video/x-msvideo"; break;
default: $ctype="application/force-download";
}
//Begin writing headers
header("Cache-Control:");
header("Cache-Control: public");
//Use the switch-generated Content-Type
header("Content-Type: $ctype");
if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE")) {
# workaround for IE filename bug with multiple periods / multiple dots in filename
# that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe
$iefilename = preg_replace('/\./', '%2e', $filename, substr_count($filename, '.') - 1);
header("Content-Disposition: attachment; filename=\"$iefilename\"");
} else {
header("Content-Disposition: attachment; filename=\"$filename\"");
}
header("Accept-Ranges: bytes");
$size=filesize($file);
//check if http_range is sent by browser (or download manager)
if(isset($_SERVER['HTTP_RANGE'])) {
list($a, $range)=explode("=",$_SERVER['HTTP_RANGE']);
//if yes, download missing part
str_replace($range, "-", $range);
$size2=$size-1;
$new_length=$size2-$range;
header("HTTP/1.1 206 Partial Content");
header("Content-Length: $new_length");
header("Content-Range: bytes $range$size2/$size");
} else {
$size2=$size-1;
header("Content-Range: bytes 0-$size2/$size");
header("Content-Length: ".$size);
}
//open the file
$fp=fopen("$file","rb");
//seek to start of missing part
fseek($fp,$range);
//start buffered download
while(!feof($fp)){
//reset time limit for big files
set_time_limit(0);
print(fread($fp,1024*8));
flush();
ob_flush();
}
fclose($fp);
exit;
}