From ef140bd158f59e1236c30e1e6db58a603f66300a Mon Sep 17 00:00:00 2001
From: weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0>
Date: Tue, 3 Aug 2010 20:28:10 +0000
Subject: [PATCH] fix memcpy with same src and dest (Peter Klotz)

---
 trunk/c5/iterhash.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/trunk/c5/iterhash.cpp b/trunk/c5/iterhash.cpp
index 478950c9..1e31e9fb 100644
--- a/trunk/c5/iterhash.cpp
+++ b/trunk/c5/iterhash.cpp
@@ -66,7 +66,8 @@ template <class T, class BASE> void IteratedHashBase<T, BASE>::Update(const byte
 			} while (len >= blockSize);
 	}
 
-	memcpy(data, input, len);
+	if (len && data != input)
+		memcpy(data, input, len);
 }
 
 template <class T, class BASE> byte * IteratedHashBase<T, BASE>::CreateUpdateSpace(size_t &size)