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sendFile() can handle partial downloads

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This commit is contained in:
Uwe Steinmann 2020-12-23 06:20:58 +01:00
parent a4636071c7
commit 3b0eafd5aa
1 changed files with 62 additions and 4 deletions
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58
inc/inc.Utils.php
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@ -644,12 +644,70 @@ function sendFile($filename) { /* {{{ */
if($settings->_enableXsendfile && function_exists('apache_get_modules') && in_array('mod_xsendfile',apache_get_modules())) {
header("X-Sendfile: ".$filename);
} else {
$size = filesize($filename);
header("Content-Length: " . $size);
if (isset($_SERVER['HTTP_RANGE'])) {
$fp = @fopen($filename, 'rb');
$length = $size; // Content length
$start = 0; // Start byte
$end = $size - 1; // End byte
header("Accept-Ranges: 0-$length");
$c_start = $start;
$c_end = $end;
list($unit, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
if (trim($unit) !== 'bytes') {
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
exit;
}
if (strpos($range, ',') !== false) {
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
exit;
}
if ($range == '-') {
$c_start = $size - substr($range, 1);
} else {
$range = explode('-', $range);
$c_start = $range[0];
$c_end = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $size;
}
$c_end = ($c_end > $end) ? $end : $c_end;
if ($c_start > $c_end || $c_start > $size - 1 || $c_end >= $size) {
header('HTTP/1.1 416 Requested Range Not Satisfiable');
header("Content-Range: bytes $start-$end/$size");
exit;
}
$start = $c_start;
$end = $c_end;
$length = $end - $start + 1;
fseek($fp, $start);
header('HTTP/1.1 206 Partial Content');
header("Content-Range: bytes $start-$end/$size");
$buffer = 1024 * 8;
while(!feof($fp) && ($p = ftell($fp)) <= $end) {
if ($p + $buffer > $end) {
$buffer = $end - $p + 1;
}
set_time_limit(0);
echo fread($fp, $buffer);
flush();
}
fclose($fp);
} else {
/* Make sure output buffering is off */
if (ob_get_level()) {
ob_end_clean();
}
readfile($filename);
}
}
} /* }}} */
/**