From 6301084ea85049ae503df7446a217437dc6aedea Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Wed, 24 Mar 2010 14:17:08 +0000
Subject: [PATCH] 2010-03-24  Tatsuhiro Tsujikawa 
 <t-tujikawa@users.sourceforge.net>

	Rewritten lastByteMask
	* src/bitfield.h
---
 ChangeLog      | 5 +++++
 src/bitfield.h | 7 ++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 497a49a7..6cc7fa00 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-24  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Rewritten lastByteMask
+	* src/bitfield.h
+
 2010-03-23  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Redefined the maximum length of buffer used for HTTP header.
diff --git a/src/bitfield.h b/src/bitfield.h
index 3b0cee73..94fb563d 100644
--- a/src/bitfield.h
+++ b/src/bitfield.h
@@ -54,7 +54,12 @@ inline unsigned char lastByteMask(size_t nbits)
   if(nbits == 0) {
     return 0;
   } else {
-    return -256 >> (8-((nbits+7)/8*8-nbits));
+    int s = nbits%8;
+    if(s == 0) {
+      return 0xff;
+    } else {
+      return -256 >> s;
+    }
   }
 }