From eba6049a82455499c68ee875843b6f44d6164fa5 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Fri, 5 Jun 2015 16:56:33 +0800
Subject: add close method for ChunkFile, fix #18

---
 io/init.lua | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'io/init.lua')

diff --git a/io/init.lua b/io/init.lua
index c151804..b722a81 100644
--- a/io/init.lua
+++ b/io/init.lua
@@ -18,6 +18,9 @@ function nerv.ChunkFile:write_chunk(chunk)
 end
 
 function nerv.ChunkFile:read_chunk(id, global_conf)
+    if self.metadata == nil then
+        nerv.error("wrong file opening mode")
+    end
     local metadata = self.metadata[id]
     if metadata == nil then
         nerv.error("chunk with id %s does not exist", id)
-- 
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