diff --git a/common.php b/common.php
index a1663b3..9c887a4 100644
--- a/common.php
+++ b/common.php
@@ -42,6 +42,7 @@ $EnvConfigs = [
     'globalHeadMdUrl'   => 0b011,
     'globalReadmeMdUrl' => 0b011,
     'globalFootOmfUrl'  => 0b011,
+    'bcmathUrl'         => 0b011,
 
     'Driver'            => 0b100,
     'client_id'         => 0b100,
@@ -320,12 +321,13 @@ function main($path)
         //error_log1($_SERVER['REQUEST_METHOD']);
         if ($_GET['action']=='del_upload_cache') {
             // del '.tmp' without login. 无需登录即可删除.tmp后缀文件
-            if (!driveisfine($_SERVER['disktag'], $drive)) return output('Not in drive, or disk [' . $_SERVER['disktag'] . '] error.', 403);
+            if (!driveisfine($_SERVER['disktag'], $drive)) return output($_SERVER['disktag']?'disk [ ' . $_SERVER['disktag'] . ' ] error.':'Not in drive', 403);
             savecache('path_' . $path1, '', $_SERVER['disktag'], 1); // clear cache.
             return $drive->del_upload_cache($path);
         }
+        
         if ($_GET['action']=='upbigfile') {
-            if (!driveisfine($_SERVER['disktag'], $drive)) return output('Not in drive, or disk [' . $_SERVER['disktag'] . '] error.', 403);
+            if (!driveisfine($_SERVER['disktag'], $drive)) return output($_SERVER['disktag']?'disk [ ' . $_SERVER['disktag'] . ' ] error.':'Not in drive', 403);
             if (!$_SERVER['admin']) {
                 if (!$_SERVER['is_guestup_path']) return output('Not_Guest_Upload_Folder', 400);
                 if (strpos($_GET['upbigfilename'], '../')!==false) return output('Not_Allow_Cross_Path', 400);
@@ -334,7 +336,20 @@ function main($path)
             return $drive->bigfileupload($path1);
         }
     }
-
+    if ($_GET['action']=='upsmallfile') {
+        //echo json_encode($_POST, JSON_PRETTY_PRINT);
+        //echo json_encode($_FILES, JSON_PRETTY_PRINT);
+        if (!driveisfine($_SERVER['disktag'], $drive)) return output($_SERVER['disktag']?'disk [ ' . $_SERVER['disktag'] . ' ] error.':'Not in drive', 403);
+        if (!$_SERVER['admin']) {
+            if (!$_SERVER['is_guestup_path']) return output('Not_Guest_Upload_Folder', 400);
+            if (strpos($_GET['upbigfilename'], '../')!==false) return output('Not_Allow_Cross_Path', 400);
+            if (strpos($_POST['upbigfilename'], '../')!==false) return output('Not_Allow_Cross_Path', 400);
+        }
+        return smallfileupload($drive, $path);
+        /*if ($_FILES['file1']['error']) return output($_FILES['file1']['error'], 400);
+        if ($_FILES['file1']['size']>4*1024*1024) return output('File too large', 400);
+        return $drive->smallfileupload($path, $_FILES['file1']);*/
+    }
     if ($_SERVER['admin']) {
         $tmp = adminoperate($path);
         if ($tmp['statusCode'] > 0) {
@@ -446,26 +461,34 @@ function main($path)
                 $fileConduitSize = getConfig('fileConduitSize', $_SERVER['disktag']);
                 $fileConduitCacheTime = getConfig('fileConduitCacheTime', $_SERVER['disktag']);
                 if (!!$fileConduitSize || !!$fileConduitCacheTime) {
-                    if ($fileConduitSize>1) $fileConduitSize *= 1024*1024;
+                    if ($fileConduitSize>0) $fileConduitSize *= 1024*1024;
                     else $fileConduitSize = 1024*1024;
-                    if ($fileConduitCacheTime>1) $fileConduitCacheTime *= 3600;
+                    if ($fileConduitCacheTime>0) $fileConduitCacheTime *= 3600;
                     else $fileConduitCacheTime = 3600;
                     /*if ($_SERVER['HTTP_RANGE']!='') {
                         $header['Range'] = $_SERVER['HTTP_RANGE'];
+                        
                         $response = curl('GET', $files['url'], '', $header, 1);
                         //return output($header['Range'] . json_encode($response['returnhead']));
                         return output(
                             $response['body'],
                             $response['stat'],
-                            //$response['returnhead'],
-                            ['Content-Type' => $files['mime'], 'Cache-Control' => 'max-age=' . $fileConduitCacheTime],
+                            $response['returnhead'],
+                            //['Accept-Ranges' => 'bytes', 'Range' => $response['returnhead']['Range'], 'Content-Type' => $files['mime'], 'Cache-Control' => 'max-age=' . $fileConduitCacheTime],
                             false
                         );
+                    } else {
+                        return output('', 206,
+                            ['Accept-Ranges' => 'bytes', 'Content-Range' => 'bytes 0-0/' . $files['size'], 'Content-Type' => $files['mime'] ]
+                        );
                     }*/
                     if ($files['size']<$fileConduitSize) return output(
                         base64_encode(file_get_contents($files['url'])),
                         200,
                         [
+                            'Accept-Ranges' => 'bytes',
+                            //'access-control-allow-origin' => '*',
+                            //'access-control-expose-headers' => 'Content-Length, WWW-Authenticate, Location, Accept-Ranges',
                             'Content-Type' => $files['mime'],
                             'Cache-Control' => 'max-age=' . $fileConduitCacheTime,
                             //'Cache-Control' => 'max-age=0',
@@ -857,7 +880,7 @@ function curl($method, $url, $data = '', $headers = [], $returnheader = 0, $loca
     }
     $ch = curl_init();
     curl_setopt($ch, CURLOPT_URL, $url);
-    curl_setopt($ch, CURLOPT_CUSTOMREQUEST,$method);
+    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
     curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
     curl_setopt($ch, CURLOPT_TIMEOUT, 5);
     curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
@@ -869,7 +892,9 @@ function curl($method, $url, $data = '', $headers = [], $returnheader = 0, $loca
     if ($location) curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
     //$response['body'] = curl_exec($ch);
     if ($returnheader) {
-        list($returnhead, $response['body']) = explode("\r\n\r\n", curl_exec($ch));
+        $tmpres = splitlast(curl_exec($ch), "\r\n\r\n");
+        $result['body'] = $tmpres[1];
+        $returnhead = $tmpres[0];
         //echo "HEAD:" . $returnhead;
         foreach (explode("\r\n", $returnhead) as $head) {
             $tmp = explode(': ', $head);
@@ -879,7 +904,7 @@ function curl($method, $url, $data = '', $headers = [], $returnheader = 0, $loca
     } else {
         $response['body'] = curl_exec($ch);
     }
-    $response['stat'] = curl_getinfo($ch,CURLINFO_HTTP_CODE);
+    $response['stat'] = curl_getinfo($ch, CURLINFO_HTTP_CODE);
     curl_close($ch);
     return $response;
 }
@@ -1208,7 +1233,7 @@ function adminform($name = '', $pass = '', $storage = '', $path = '')
 function adminoperate($path)
 {
     global $drive;
-    if ($_SERVER['REQUEST_METHOD']=='POST') if (!driveisfine($_SERVER['disktag'], $drive)) return output('Not in drive, or disk [' . $_SERVER['disktag'] . '] error.', 403);
+    if ($_SERVER['REQUEST_METHOD']=='POST') if (!driveisfine($_SERVER['disktag'], $drive)) return output($_SERVER['disktag']?'disk [ ' . $_SERVER['disktag'] . ' ] error.':'Not in drive', 403);
     $path1 = path_format($_SERVER['list_path'] . '/' . $path);
     if (substr($path1, -1)=='/') $path1=substr($path1, 0, -1);
     $tmpget = $_GET;
@@ -2159,7 +2184,13 @@ function render_list($path = '', $files = [])
     $p_path='';
     if ($path1 !== '/') {
         if ($files['type']=='file') {
-            $pretitle = str_replace('&','&amp;', $files['name']);
+            if (isset($files['name'])) {
+                $pretitle = str_replace('&','&amp;', $files['name']);
+            } else {
+                if (substr($path1, 0, 1)=='/') $pretitle = substr($path1, 1);
+                if (substr($path1, -1)=='/') $pretitle = substr($pretitle, 0, -1);
+                $pretitle = str_replace('&','&amp;', $pretitle);
+            }
             $n_path = $pretitle;
             $tmp = splitlast(splitlast($path1,'/')[0],'/');
             if ($tmp[1]=='') {