quakeforge/include/QF/qendian.h

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/*
qendian.h
(description)
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifndef __qendian_h
#define __qendian_h
/** \defgroup qendian Endian handling functions
\ingroup utils
*/
//@{
#include "QF/qtypes.h"
#ifndef NULL
# define NULL ((void *)0)
#endif
#define Q_MAXCHAR ((char)0x7f)
#define Q_MAXSHORT ((short)0x7fff)
#define Q_MAXINT ((int)0x7fffffff)
#define Q_MAXLONG ((int)0x7fffffff)
#define Q_MAXFLOAT 3.40282346638528859811704183484516925440e38
#define Q_MINCHAR ((char)0x80)
#define Q_MINSHORT ((short)0x8000)
#define Q_MININT ((int)0x80000000)
#define Q_MINLONG ((int)0x80000000)
#define Q_MINFLOAT -3.40282346638528859811704183484516925440e38
#define Q_FLOAT_EPSILON 1.1754943508222875079687365372222456778186655567720875215087517062784172594547271728515625e-38
//============================================================================
#ifndef WORDS_BIGENDIAN
#define BigShort ShortSwap
#define LittleShort ShortNoSwap
#define BigLong LongSwap
#define LittleLong LongNoSwap
#define BigFloat FloatSwap
#define LittleFloat FloatNoSwap
#else
#define BigShort ShortNoSwap
#define LittleShort ShortSwap
#define BigLong LongNoSwap
#define LittleLong LongSwap
#define BigFloat FloatNoSwap
#define LittleFloat FloatSwap
#endif
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extern qboolean bigendien;
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short _ShortSwap (short l);
short _ShortNoSwap (short l);
int _LongSwap (int l);
int _LongNoSwap (int l);
float _FloatSwap (float f);
float _FloatNoSwap (float f);
#ifdef __GNUC__
#define ShortSwap(l) ({ uint16_t x = (uint16_t) (l); \
x = ( ((x >> 8) & 0xff) \
| ((x << 8) & 0xff00)); \
x; })
#define LongSwap(l) ({ uint32_t z = (uint32_t) (l); \
z = (ShortSwap (z >> 16)) | (ShortSwap (z) << 16); \
z; })
#define FloatSwap(l) ({ union { uint32_t i; float f; } y; \
y.f = (l); \
y.i = LongSwap (y.i); \
y.f; })
#else
#define ShortSwap(l) _ShortSwap (l)
#define LongSwap(l) _LongSwap (l)
#define FloatSwap(l) _FloatSwap (l)
#endif
#define ShortNoSwap(l) (l)
#define LongNoSwap(l) (l)
#define FloatNoSwap(l) (l)
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// NOTE: these /always/ read and write /little/ endian entities.
struct QFile_s;
void WriteFloat (struct QFile_s *file, float f);
void WriteByte (struct QFile_s *file, int b);
void WriteShort (struct QFile_s *file, unsigned int s);
void WriteLong (struct QFile_s *file, unsigned int l);
float ReadFloat (struct QFile_s *file);
byte ReadByte (struct QFile_s *file);
unsigned short ReadShort (struct QFile_s *file);
unsigned int ReadLong (struct QFile_s *file);
//@}
#endif // __qendian_h