/**
* Function to download a file to the user.
* @param String $RealFile
* @param String $OutputFile
* @return boolean
*/
public static function download($RealFile, $OutputFile = null)
{
$File = realpath($RealFile);
//get the file path of the real file.
if (!$File) {
//If the real file does not exists, then just return.
return false;
}
if (!DownloadManager::IsModifiedSince($File)) {
//If the file has not modifed since last visit, no need to send data.
return true;
}
$FileSize = filesize($File);
if ($OutputFile === null) {
//If no outfile has not been mentioned, use the real file name by default.
$OutputFile = basename($RealFile);
}
if (strpos($OutputFile, " ") !== false) {
//to handle situtations where the file contains space in its name.
$OutputFile = "'{$OutputFile}'";
}
header("Content-Type: " . DownloadManager::MIME($OutputFile));
//specify the header for the file type.
header("Content-disposition: filename={$OutputFile}");
//specify the header for the file name.
$extremes = DownloadManager::calculateHttpRange();
//calculate the range, if present, till the file needs to be read.
//check for the present of ranges that has to be read.
if (isset($extremes[0])) {
$seek_start = $extremes[0];
}
if (isset($extremes[1])) {
$seek_end = $extremes[1];
}
//set start and end based on range (if set), else set defaults
//also check for invalid ranges.
$seek_end = empty($seek_end) ? $FileSize - 1 : min(abs(intval($seek_end)), $FileSize - 1);
$seek_start = empty($seek_start) || $seek_end < abs(intval($seek_start)) ? 0 : max(abs(intval($seek_start)), 0);
//add headers if resumable
$Resumable = false;
if ($seek_start > 0 || $seek_end < $FileSize - 1) {
$Resumable = true;
header('HTTP/1.1 206 Partial Content');
//specify header that the data you are getting is partial data.
}
//specify headers for common information.
header('Accept-Ranges: bytes');
header('Content-Range: bytes ' . $seek_start . '-' . $seek_end . '/' . $FileSize);
header('Content-Length: ' . ($seek_end - $seek_start + 1));
return DownloadManager::downloadSpeed($File, $seek_start, $seek_end, $Resumable);
}
