Create sign extension routines in <wsutil/sign_ext.h>, use it in few places.

svn path=/trunk/; revision=54197

1 files changed, 50 insertions, 0 deletions

diff --git a/wsutil/sign_ext.h b/wsutil/sign_ext.h
new file mode 100644
index 0000000000..ef911829ae
--- /dev/null
+++ b/wsutil/sign_ext.h
@@ -0,0 +1,50 @@
+/*
+ * sign_ext.h
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __WSUTIL_SIGN_EXT_H__
+#define __WSUTIL_SIGN_EXT_H__
+
+#include <glib.h>
+
+/* sign extension routines */
+
+static inline guint32
+ws_sign_ext32(guint32 val, int no_of_bits)
+{
+	if (val & (1 << (no_of_bits-1)))
+		val |= (-1 << no_of_bits);
+
+	return val;
+} _U_
+
+static inline guint64
+ws_sign_ext64(guint64 val, int no_of_bits)
+{
+	if (val & (1LL << (no_of_bits-1)))
+		val |= (-1 << no_of_bits);
+
+	return val;
+} _U_
+
+#endif /* __WSUTIL_SIGN_EXT_H__ */