From f6d7888d9e28222b8df9c5ba5359e358e9c1677b Mon Sep 17 00:00:00 2001
From: Greg Thornton <gthornton@cjadvertising.com>
Date: Thu, 14 Jul 2011 13:47:07 -0500
Subject: [PATCH] Added xls detection.

---
 tablib/formats/_xls.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tablib/formats/_xls.py b/tablib/formats/_xls.py
index 1282a43..c801658 100644
--- a/tablib/formats/_xls.py
+++ b/tablib/formats/_xls.py
@@ -112,3 +112,11 @@ def dset_sheet(dataset, ws):
                     ws.write(i, j, col)
 
 
+def detect(stream):
+    """Returns True if given stream is valid XLS."""
+    
+    try:
+        xlrd.open_workbook(file_contents=stream)
+        return True
+    except xlrd.XLRDError:
+        return False