static function SendFile($file_path, $args = array())
{
$defaults = array('bandwidth' => 0, 'etag' => null, 'force_download' => false, 'cache_max_age' => 0, 'md5_hash' => null, 'filename' => null);
extract(wp_parse_args($args, $defaults), EXTR_SKIP);
@ini_set('max_execution_time', '0');
@set_time_limit(0);
@error_reporting(0);
while (@ob_end_clean()) {
}
$no_cache = WPFB_Core::$settings->http_nocache && $cache_max_age != 0;
@ini_set("zlib.output_compression", "Off");
// remove some headers
if (function_exists('header_remove')) {
header_remove();
} else {
header("Expires: ");
header("X-Pingback: ");
}
if (!@file_exists($file_path) || !is_file($file_path)) {
header('HTTP/1.x 404 Not Found');
wp_die('File ' . basename($file_path) . ' not found!');
}
wpfb_loadclass('FileUtils');
$size = WPFB_FileUtils::GetFileSize($file_path);
$time = filemtime($file_path);
$file_type = WPFB_Download::GetFileType($file_path);
if (empty($etag)) {
$etag = md5("{$size}|{$time}|{$file_type}");
} else {
$etag = trim($etag, '"');
}
// set basic headers
if ($no_cache) {
header("Cache-Control: no-cache, must-revalidate, max-age=0");
header("Pragma: no-cache");
header("Expires: Wed, 11 Jan 1984 05:00:00 GMT");
} elseif ($cache_max_age > 0) {
header("Cache-Control: must-revalidate, max-age={$cache_max_age}");
} elseif ($cache_max_age == -1) {
header("Cache-Control: public");
}
//header("Connection: close");
//header("Keep-Alive: timeout=5, max=100");
//header("Connection: Keep-Alive");
header("Content-Type: " . $file_type . (strpos($file_type, 'text/') !== false ? '; charset=' : ''));
// charset fix
header("Last-Modified: " . gmdate("D, d M Y H:i:s", $no_cache ? time() : $time) . " GMT");
if (!empty($md5_hash) && $md5_hash[0] != '#') {
// check if fake md5
$pmd5 = @pack('H32', $md5_hash);
if (!empty($pmd5)) {
header("Content-MD5: " . @base64_encode($pmd5));
}
}
if (!$no_cache) {
header("ETag: \"{$etag}\"");
$if_mod_since = !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? $_SERVER['HTTP_IF_MODIFIED_SINCE'] : false;
$if_none_match = !empty($_SERVER['HTTP_IF_NONE_MATCH']) ? $etag == trim($_SERVER['HTTP_IF_NONE_MATCH'], '"') : false;
if ($if_mod_since || $if_none_match) {
$not_modified = true;
if ($not_modified && $if_mod_since) {
$not_modified = @strtotime($if_mod_since) >= $time;
}
if ($not_modified && $if_none_match) {
$not_modified = $if_none_match == $etag;
}
if ($not_modified) {
header("Content-Length: " . $size);
header("HTTP/1.x 304 Not Modified");
exit;
}
}
}
if (!($fh = @fopen($file_path, 'rb'))) {
wp_die(__('Could not read file!', WPFB));
}
$begin = 0;
$end = $size - 1;
$http_range = isset($_SERVER['HTTP_RANGE']) ? $_SERVER['HTTP_RANGE'] : '';
if (!empty($http_range) && strpos($http_range, 'bytes=') !== false && strpos($http_range, ',') === false) {
$range = array_map('trim', explode('-', trim(substr($http_range, 6))));
if (is_numeric($range[0])) {
$begin = 0 + $range[0];
if (is_numeric($range[1])) {
$end = 0 + $range[1];
}
} else {
$begin = $size - $range[1];
// format "-x": last x bytes
}
} else {
$http_range = '';
}
if ($begin > 0 || $end < $size - 1) {
header('HTTP/1.0 206 Partial Content');
} else {
header('HTTP/1.0 200 OK');
}
$length = $end - $begin + 1;
WPFB_Download::AddTraffic($length);
if (WPFB_Download::ShouldSendRangeHeader($file_path, $file_type)) {
header("Accept-Ranges: bytes");
}
// content headers
if (!empty($force_download) || WPFB_Download::ShouldSendDLHeader($file_path, $file_type) || !empty($filename)) {
header("Content-Disposition: attachment; filename=\"" . (empty($filename) ? basename($file_path) : $filename) . "\"");
header("Content-Description: File Transfer");
}
header("Content-Length: " . $length);
if (!empty($http_range)) {
header("Content-Range: bytes {$begin}-{$end}/{$size}");
}
// clean up things that are not needed for download
@session_write_close();
// disable blocking of multiple downloads at the same time
global $wpdb;
if (!empty($wpdb->dbh) && is_resource($wpdb->dbh)) {
@mysql_close($wpdb->dbh);
} else {
@mysql_close();
}
@ob_flush();
@flush();
//if(WPFB_Core::$settings->dl_destroy_session)
// @session_destroy();
// ready to send the file!
if ($begin > 0) {
fseek($fh, $begin, 0);
}
if (WPFB_Core::$settings->use_fpassthru) {
fpassthru($fh);
} else {
$bandwidth = empty($bandwidth) ? 0 : (double) $bandwidth;
if ($bandwidth <= 0) {
$bandwidth = 1024 * 1024;
}
$buffer_size = (int) (1024 * min($bandwidth, 64));
// convert kib/s => bytes/ms
$bandwidth *= 1024;
$bandwidth /= 1000;
$cur = $begin;
while (!@feof($fh) && $cur <= $end && @connection_status() == 0) {
$nbytes = min($buffer_size, $end - $cur + 1);
$ts = microtime(true);
print @fread($fh, $nbytes);
@ob_flush();
@flush();
$dt = (microtime(true) - $ts) * 1000;
// dt = time delta in ms
$st = $nbytes / $bandwidth - $dt;
if ($st > 0) {
usleep($st * 1000);
}
$cur += $nbytes;
}
}
@fclose($fh);
return true;
}
