outsource hash function

tg_server/hash.lua

@@ -0,0 +1,7 @@
+function hash(str)
+    local hash = 0
+    for i = 1, #str do
+        hash = (hash * 31 + string.byte(str, i)) % 65536
+    end
+    return string.format("%04X", hash)
+end

tg_server/tg_server.lua

@@ -13,14 +13,7 @@ local function split(str, divider)
     return t
 end
 
-local function hash(str)
+dofile(dir..'hash.lua')
-    local hash = 0
-    for i = 1, #str do
-        hash = (hash * 31 + string.byte(str, i)) % 65536
-    end
-    return string.format("%04X", hash)
-end
-
 
 local function check_for_outdated_sessions()
     local expired = 0