From b30e2af282a291dfb9bac07d1d68cdaa186b24cc Mon Sep 17 00:00:00 2001
From: "Martin A. Brown" <martin@linux-ip.net>
Date: Mon, 7 Mar 2016 09:11:35 -0800
Subject: [PATCH] require exact signature match; stop with .lower()

was comparing for case insensitive matches when locating signatures; probably
a bad idea; better to simply require an exact match
---
 tldp/doctypes/common.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tldp/doctypes/common.py b/tldp/doctypes/common.py
index 8893717..f2eeca3 100644
--- a/tldp/doctypes/common.py
+++ b/tldp/doctypes/common.py
@@ -44,10 +44,10 @@ class SignatureChecker(object):
     @classmethod
     def signatureLocation(cls, f):
         f.seek(0)
-        buf = f.read(1024).lower()
+        buf = f.read(1024)
         for sig in cls.signatures:
             try:
-                sindex = buf.index(sig.lower())
+                sindex = buf.index(sig)
                 logger.debug("YES FOUND signature %r in %s at %s; doctype %s.",
                              sig, f.name, sindex, cls)
                 return sindex