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diff --git a/openvpn/tap-win32/endian.h b/openvpn/tap-win32/endian.h
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+/*
+ * TAP-Win32 -- A kernel driver to provide virtual tap device
+ * functionality on Windows. Originally derived
+ * from the CIPE-Win32 project by Damion K. Wilson,
+ * with extensive modifications by James Yonan.
+ *
+ * All source code which derives from the CIPE-Win32 project is
+ * Copyright (C) Damion K. Wilson, 2003, and is released under the
+ * GPL version 2 (see below).
+ *
+ * All other source code is Copyright (C) 2002-2005 OpenVPN Solutions LLC,
+ * and is released under the GPL version 2 (see below).
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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 (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifdef TAP_LITTLE_ENDIAN
+#define ntohs(x) RtlUshortByteSwap(x)
+#define htons(x) RtlUshortByteSwap(x)
+#define ntohl(x) RtlUlongByteSwap(x)
+#define htonl(x) RtlUlongByteSwap(x)
+#else
+#define ntohs(x) ((USHORT)(x))
+#define htons(x) ((USHORT)(x))
+#define ntohl(x) ((ULONG)(x))
+#define htonl(x) ((ULONG)(x))
+#endif