apps/plugins/doom/m_swap.h

   1 /* Emacs style mode select   -*- C++ -*-
   2  *-----------------------------------------------------------------------------
   3  *
   4  *
   5  *  PrBoom a Doom port merged with LxDoom and LSDLDoom
   6  *  based on BOOM, a modified and improved DOOM engine
   7  *  Copyright (C) 1999 by
   8  *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
   9  *  Copyright (C) 1999-2000 by
  10  *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
  11  *
  12  *  This program is free software; you can redistribute it and/or
  13  *  modify it under the terms of the GNU General Public License
  14  *  as published by the Free Software Foundation; either version 2
  15  *  of the License, or (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  25  *  02111-1307, USA.
  26  *
  27  * DESCRIPTION:
  28  *      Endianess handling, swapping 16bit and 32bit.
  29  *
  30  *-----------------------------------------------------------------------------*/
  31
  32
  33 #ifndef __M_SWAP__
  34 #define __M_SWAP__
  35
  36 #ifdef __GNUG__
  37 #pragma interface
  38 #endif
  39
  40 #include "plugin.h"
  41
  42 /* Endianess handling. */
  43
  44 /* cph - First the macros to do the actual byte swapping */
  45
  46 /* leban
  47  * rather than continue the confusing tradition of redefining the
  48  * stardard macro, we now present the doom_ntoh and doom_hton macros....
  49  * might as well use the xdoom macros.
  50  */
  51
  52 #ifndef doom_swap_l
  53 #define doom_swap_l(x) \
  54         ((long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
  55                              (((unsigned long int)(x) & 0x0000ff00U) <<  8) | \
  56                              (((unsigned long int)(x) & 0x00ff0000U) >>  8) | \
  57                              (((unsigned long int)(x) & 0xff000000U) >> 24)))
  58 #endif
  59
  60 #ifndef doom_swap_s
  61 #define doom_swap_s(x) \
  62         ((short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
  63                               (((unsigned short int)(x) & 0xff00) >> 8)))
  64 #endif
  65
  66 /* Macros are named doom_XtoYT, where
  67  * X is thing to convert from, Y is thing to convert to, chosen from
  68  * n for network, h for host (i.e our machine's), w for WAD (Doom data files)
  69  * and T is the type, l or s for long or short
  70  *
  71  * CPhipps - all WADs and network packets will be little endian for now
  72  * Use separate macros so network could be converted to big-endian later.
  73  */
  74
  75 #ifndef ROCKBOX_LITTLE_ENDIAN
  76
  77 #define doom_wtohl(x) doom_swap_l(x)
  78 #define doom_htowl(x) doom_swap_l(x)
  79 #define doom_wtohs(x) doom_swap_s(x)
  80 #define doom_htows(x) doom_swap_s(x)
  81
  82 #define doom_ntohl(x) doom_swap_l(x)
  83 #define doom_htonl(x) doom_swap_l(x)
  84 #define doom_ntohs(x) doom_swap_s(x)
  85 #define doom_htons(x) doom_swap_s(x)
  86
  87 #else
  88
  89 #define doom_wtohl(x) (long int)(x)
  90 #define doom_htowl(x) (long int)(x)
  91 #define doom_wtohs(x) (short int)(x)
  92 #define doom_htows(x) (short int)(x)
  93
  94 #define doom_ntohl(x) (long int)(x)
  95 #define doom_htonl(x) (long int)(x)
  96 #define doom_ntohs(x) (short int)(x)
  97 #define doom_htons(x) (short int)(x)
  98
  99 #endif
 100
 101 /* CPhipps - Boom's old LONG and SHORT endianness macros are for WAD stuff */
 102
 103 #define LONG(x) doom_wtohl(x)
 104 #define SHORT(x) doom_htows(x)
 105
 106 #endif