diff --git a/src/xpdev/xpendian.h b/src/xpdev/xpendian.h
new file mode 100644
index 0000000000000000000000000000000000000000..cbc35454f58686c207e2fffbc0c6e5bc49c48c25
--- /dev/null
+++ b/src/xpdev/xpendian.h
@@ -0,0 +1,72 @@
+/* endian.h */
+
+/* Macros to convert integer "endianness" */
+
+/* $Id$ */
+
+/****************************************************************************
+ * @format.tab-size 4		(Plain Text/Source Code File Header)			*
+ * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
+ *																			*
+ * Copyright 2003 Rob Swindell - http://www.synchro.net/copyright.html		*
+ *																			*
+ * This library is free software; you can redistribute it and/or			*
+ * modify it under the terms of the GNU Lesser General Public License		*
+ * as published by the Free Software Foundation; either version 2			*
+ * of the License, or (at your option) any later version.					*
+ * See the GNU Lesser General Public License for more details: lgpl.txt or	*
+ * http://www.fsf.org/copyleft/lesser.html									*
+ *																			*
+ * Anonymous FTP access to the most recent released source is available at	*
+ * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
+ *																			*
+ * Anonymous CVS access to the development source and modification history	*
+ * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
+ * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
+ *     (just hit return, no password is necessary)							*
+ * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
+ *																			*
+ * For Synchronet coding style and modification guidelines, see				*
+ * http://www.synchro.net/source.html										*
+ *																			*
+ * You are encouraged to submit any modifications (preferably in Unix diff	*
+ * format) via e-mail to mods@synchro.net									*
+ *																			*
+ * Note: If this box doesn't appear square, then you need to fix your tabs.	*
+ ****************************************************************************/
+
+#ifndef _ENDIAN_H
+
+/************************/
+/* byte-swapping macros */
+/************************/
+#define BYTE_SWAP_SHORT(x)	((((short)(x)&0xff00)>>8) | (((short)(x)&0x00ff)<<8))
+#define BYTE_SWAP_LONG(x)	((((long)(x)&0xff000000)>>24) | (((long)(x)&0x00ff0000)>>8) | (((long)(x)&0x0000ff00)<<8) | (((long)(x) & 0x000000ff)<<24))
+
+/* auto-detect integer size */
+#define BYTE_SWAP_INT(x)	(sizeof(x)==sizeof(short) ? BYTE_SWAP_SHORT(x) : BYTE_SWAP_LONG(x))
+
+/********************************/
+/* Architecture-specific macros */
+/********************************/
+#ifdef __BIG_ENDIAN__	/* e.g. Motorola */
+
+	#define BE_SHORT(x)		(x)
+	#define BE_LONG(x)		(x)
+	#define BE_INT(x)		(x)
+	#define LE_SHORT(x)		BYTE_SWAP_SHORT(x)
+	#define LE_LONG(x)		BYTE_SWAP_LONG(x)
+	#define LE_INT(x)		BYTE_SWAP_INT(x)
+
+#else	/* Little Endian (e.g. Intel) */
+
+	#define LE_SHORT(x)		(x)
+	#define LE_LONG(x)		(x)
+	#define LE_INT(x)		(x)
+	#define BE_SHORT(x)		BYTE_SWAP_SHORT(x)
+	#define BE_LONG(x)		BYTE_SWAP_LONG(x)
+	#define BE_INT(x)		BYTE_SWAP_INT(x)
+
+#endif
+
+#endif	/* Don't add anything after this line */