From 603e41283fbd96fd49d2791323bcd6a947cf661a Mon Sep 17 00:00:00 2001
From: David Vierra <codewarrior@hawaii.rr.com>
Date: Mon, 26 Nov 2012 02:10:39 -1000
Subject: [PATCH] Fixed: Make sure chunk data is at least 5 bytes long for the
 chunk header.

---
 regionfile.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/regionfile.py b/regionfile.py
index af19fa7..8c5bd55 100644
--- a/regionfile.py
+++ b/regionfile.py
@@ -181,7 +181,9 @@ class MCRegionFile(object):
         with self.file as f:
             f.seek(sectorStart * self.SECTOR_BYTES)
             data = f.read(numSectors * self.SECTOR_BYTES)
-        assert(len(data) > 0)
+        if len(data) < 5:
+            raise RegionMalformed, "Chunk data is only %d bytes long (expected 5)" % len(data)
+
         # log.debug("REGION LOAD {0},{1} sector {2}".format(cx, cz, sectorStart))
 
         length = struct.unpack_from(">I", data)[0]