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A simple download script with resume and multi-part support
<?php
date_default_timezone_set('GMT');
//1- file we want to serve :
$data_file = "/home/f0rud/Aalto Talk with Linus Torvalds [Full-length].mp4";
$data_size = filesize($data_file); //Size is not zero base
$mime = 'application/otect-stream'; //Mime type of file. to begin download its better to use this.
$filename = basename($data_file); //Name of file, no path included
//2- Check for request, is the client support this method?
if (isset($_SERVER['HTTP_RANGE']) || isset($HTTP_SERVER_VARS['HTTP_RANGE'])) {
$ranges_str = (isset($_SERVER['HTTP_RANGE']))?$_SERVER['HTTP_RANGE']:$HTTP_SERVER_VARS['HTTP_RANGE'];
$ranges_arr = explode('-', substr($ranges_str, strlen('bytes=')));
//Now its time to check the ranges
if ((intval($ranges_arr[0]) >= intval($ranges_arr[1]) && $ranges_arr[1] != "" && $ranges_arr[0] != "" )
|| ($ranges_arr[1] == "" && $ranges_arr[0] == "")
) {
//Just serve the file normally request is not valid :(
$ranges_arr[0] = 0;
$ranges_arr[1] = $data_size - 1;
}
} else { //The client dose not request HTTP_RANGE so just use the entire file
$ranges_arr[0] = 0;
$ranges_arr[1] = $data_size - 1;
}
//Now its time to serve file
$file = fopen($data_file, 'rb');
$start = $stop = 0;
if ($ranges_arr[0] === "") { //No first range in array
//Last n1 byte
$stop = $data_size - 1;
$start = $data_size - intval($ranges_arr[1]);
} elseif ($ranges_arr[1] === "") { //No last
//first n0 byte
$start = intval($ranges_arr[0]);
$stop = $data_size - 1;
} else {
// n0 to n1
$stop = intval($ranges_arr[1]);
$start = intval($ranges_arr[0]);
}
//Make sure the range is correct by checking the file
fseek($file, $start, SEEK_SET);
$start = ftell($file);
fseek($file, $stop, SEEK_SET);
$stop = ftell($file);
$data_len = $stop - $start;
//Lets send headers
if (isset($_SERVER['HTTP_RANGE']) || isset($HTTP_SERVER_VARS['HTTP_RANGE'])) {
header('HTTP/1.0 206 Partial Content');
header('Status: 206 Partial Content');
}
header('Accept-Ranges: bytes');
header('Content-type: ' . $mime);
header('Content-Disposition: attachment; filename="' . $filename . '"');
header("Content-Range: bytes $start-$stop/" . $data_size );
header("Content-Length: " . ($data_len + 1));
//Finally serve data and done ~!
fseek($file, $start, SEEK_SET);
$bufsize = 2048000;
ignore_user_abort(true);
@set_time_limit(0);
while (!(connection_aborted() || connection_status() == 1) && $data_len > 0) {
echo fread($file, $bufsize);
$data_len -= $bufsize;
flush();
}
fclose($file);
@antayirp
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antayirp commented May 7, 2019

Line 9: a typo "otect-stream", should be "octet-stream".

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