mirror of
https://github.com/id-Software/DOOM-iOS.git
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135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
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/* Emacs style mode select -*- C++ -*-
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*-----------------------------------------------------------------------------
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*
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*
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* PrBoom: a Doom port merged with LxDoom and LSDLDoom
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* based on BOOM, a modified and improved DOOM engine
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* Copyright (C) 1999 by
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* id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
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* Copyright (C) 1999-2000 by
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* Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
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* Copyright 2005, 2006 by
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* Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* DESCRIPTION:
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* Endianess handling, swapping 16bit and 32bit.
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*
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*-----------------------------------------------------------------------------*/
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#ifndef __M_SWAP__
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#define __M_SWAP__
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#ifdef __GNUG__
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#pragma interface
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#endif
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/* CPhipps - now the endianness handling, converting input or output to/from
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* the machine's endianness to that wanted for this type of I/O
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*
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* To find our own endianness, use config.h
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* Endianess handling. */
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/* cph - First the macros to do the actual byte swapping */
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/* leban
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* rather than continue the confusing tradition of redefining the
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* stardard macro, we now present the doom_ntoh and doom_hton macros....
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* might as well use the xdoom macros.
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*/
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/* Try to use superfast macros on systems that support them */
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#ifdef HAVE_ASM_BYTEORDER_H
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#include <asm/byteorder.h>
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#ifdef __arch__swab16
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#define doom_swap_s (signed short)__arch__swab16
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#endif
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#ifdef __arch__swab32
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#define doom_swap_l (signed long)__arch__swab32
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#endif
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#endif /* HAVE_ASM_BYTEORDER_H */
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#ifdef HAVE_LIBKERN_OSBYTEORDER_H
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#include <libkern/OSByteOrder.h>
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#define doom_swap_s (short)OSSwapInt16
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#define doom_swap_l (long)OSSwapInt32
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#endif
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#ifndef doom_swap_l
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#define doom_swap_l(x) \
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((long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
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(((unsigned long int)(x) & 0x0000ff00U) << 8) | \
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(((unsigned long int)(x) & 0x00ff0000U) >> 8) | \
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(((unsigned long int)(x) & 0xff000000U) >> 24)))
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#endif
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#ifndef doom_swap_s
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#define doom_swap_s(x) \
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((short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
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(((unsigned short int)(x) & 0xff00) >> 8)))
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#endif
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/* Macros are named doom_XtoYT, where
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* X is thing to convert from, Y is thing to convert to, chosen from
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* n for network, h for host (i.e our machine's), w for WAD (Doom data files)
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* and T is the type, l or s for long or short
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*
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* CPhipps - all WADs and network packets will be little endian for now
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* Use separate macros so network could be converted to big-endian later.
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*/
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#ifdef WORDS_BIGENDIAN
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#define doom_wtohl(x) doom_swap_l(x)
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#define doom_htowl(x) doom_swap_l(x)
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#define doom_wtohs(x) doom_swap_s(x)
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#define doom_htows(x) doom_swap_s(x)
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#define doom_ntohl(x) doom_swap_l(x)
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#define doom_htonl(x) doom_swap_l(x)
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#define doom_ntohs(x) doom_swap_s(x)
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#define doom_htons(x) doom_swap_s(x)
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#else
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#define doom_wtohl(x) (long int)(x)
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#define doom_htowl(x) (long int)(x)
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#define doom_wtohs(x) (short int)(x)
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#define doom_htows(x) (short int)(x)
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#define doom_ntohl(x) (long int)(x)
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#define doom_htonl(x) (long int)(x)
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#define doom_ntohs(x) (short int)(x)
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#define doom_htons(x) (short int)(x)
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#endif
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/* CPhipps - Boom's old LONG and SHORT endianness macros are for WAD stuff */
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#define LONG(x) doom_wtohl(x)
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#define SHORT(x) doom_htows(x)
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#endif
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