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+/* Emacs style mode select   -*- C++ -*-
+ *-----------------------------------------------------------------------------
+ *
+ *
+ *  PrBoom: a Doom port merged with LxDoom and LSDLDoom
+ *  based on BOOM, a modified and improved DOOM engine
+ *  Copyright (C) 1999 by
+ *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
+ *  Copyright (C) 1999-2000 by
+ *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
+ *  Copyright 2005, 2006 by
+ *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
+ *
+ *  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., 59 Temple Place - Suite 330, Boston, MA
+ *  02111-1307, USA.
+ *
+ * DESCRIPTION:
+ *      Endianess handling, swapping 16bit and 32bit.
+ *
+ *-----------------------------------------------------------------------------*/
+
+
+#ifndef __M_SWAP__
+#define __M_SWAP__
+
+#ifdef __GNUG__
+#pragma interface
+#endif
+
+/* CPhipps - now the endianness handling, converting input or output to/from 
+ * the machine's endianness to that wanted for this type of I/O
+ *
+ * To find our own endianness, use config.h
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+/* Endianess handling. */
+
+/* cph - First the macros to do the actual byte swapping */
+
+/* leban
+ * rather than continue the confusing tradition of redefining the
+ * stardard macro, we now present the doom_ntoh and doom_hton macros....
+ * might as well use the xdoom macros.
+ */
+
+/* Try to use superfast macros on systems that support them */
+#ifdef HAVE_ASM_BYTEORDER_H
+#include <asm/byteorder.h>
+#ifdef __arch__swab16
+#define doom_swap_s  (signed short)__arch__swab16
+#endif
+#ifdef __arch__swab32
+#define doom_swap_l  (signed long)__arch__swab32
+#endif
+#endif /* HAVE_ASM_BYTEORDER_H */
+
+#ifdef HAVE_LIBKERN_OSBYTEORDER_H
+#include <libkern/OSByteOrder.h>
+
+#define doom_swap_s (short)OSSwapInt16
+#define doom_swap_l (long)OSSwapInt32
+#endif
+
+#ifndef doom_swap_l
+#define doom_swap_l(x) \
+        ((long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
+                             (((unsigned long int)(x) & 0x0000ff00U) <<  8) | \
+                             (((unsigned long int)(x) & 0x00ff0000U) >>  8) | \
+                             (((unsigned long int)(x) & 0xff000000U) >> 24)))
+#endif
+
+#ifndef doom_swap_s
+#define doom_swap_s(x) \
+        ((short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
+                              (((unsigned short int)(x) & 0xff00) >> 8))) 
+#endif
+
+/* Macros are named doom_XtoYT, where 
+ * X is thing to convert from, Y is thing to convert to, chosen from 
+ * n for network, h for host (i.e our machine's), w for WAD (Doom data files)
+ * and T is the type, l or s for long or short
+ *
+ * CPhipps - all WADs and network packets will be little endian for now
+ * Use separate macros so network could be converted to big-endian later.
+ */
+
+#ifdef WORDS_BIGENDIAN
+
+#define doom_wtohl(x) doom_swap_l(x)
+#define doom_htowl(x) doom_swap_l(x)
+#define doom_wtohs(x) doom_swap_s(x)
+#define doom_htows(x) doom_swap_s(x)
+
+#define doom_ntohl(x) doom_swap_l(x)
+#define doom_htonl(x) doom_swap_l(x)
+#define doom_ntohs(x) doom_swap_s(x)
+#define doom_htons(x) doom_swap_s(x)
+
+#else
+
+#define doom_wtohl(x) (long int)(x)
+#define doom_htowl(x) (long int)(x)
+#define doom_wtohs(x) (short int)(x)
+#define doom_htows(x) (short int)(x)
+
+#define doom_ntohl(x) (long int)(x)
+#define doom_htonl(x) (long int)(x)
+#define doom_ntohs(x) (short int)(x)
+#define doom_htons(x) (short int)(x)
+
+#endif
+
+/* CPhipps - Boom's old LONG and SHORT endianness macros are for WAD stuff */
+
+#define LONG(x) doom_wtohl(x)
+#define SHORT(x) doom_htows(x)
+
+#endif