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9bfcdad35a
Expecting int to be 32 bits is a little dangerous, and the function versions of swap/noswap should be unsigned rather than signed.
123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/*
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qendian.h
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(description)
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 1999,2000 contributors of the QuakeForge project
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Please see the file "AUTHORS" for a list of contributors
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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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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.
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See the GNU General Public License for more details.
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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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifndef __qendian_h
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#define __qendian_h
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/** \defgroup qendian Endian handling functions
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\ingroup utils
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*/
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//@{
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#include "QF/qtypes.h"
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#ifndef NULL
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# define NULL ((void *)0)
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#endif
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#define Q_MAXCHAR ((char)0x7f)
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#define Q_MAXSHORT ((short)0x7fff)
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#define Q_MAXINT ((int)0x7fffffff)
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#define Q_MAXLONG ((int)0x7fffffff)
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#define Q_MAXFLOAT 3.40282346638528859811704183484516925440e38
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#define Q_MINCHAR ((char)0x80)
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#define Q_MINSHORT ((short)0x8000)
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#define Q_MININT ((int)0x80000000)
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#define Q_MINLONG ((int)0x80000000)
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#define Q_MINFLOAT -3.40282346638528859811704183484516925440e38
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#define Q_FLOAT_EPSILON 1.1754943508222875079687365372222456778186655567720875215087517062784172594547271728515625e-38
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//============================================================================
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#ifndef WORDS_BIGENDIAN
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#define BigShort ShortSwap
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#define LittleShort ShortNoSwap
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#define BigLong LongSwap
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#define LittleLong LongNoSwap
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#define BigFloat FloatSwap
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#define LittleFloat FloatNoSwap
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#else
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#define BigShort ShortNoSwap
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#define LittleShort ShortSwap
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#define BigLong LongNoSwap
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#define LittleLong LongSwap
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#define BigFloat FloatNoSwap
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#define LittleFloat FloatSwap
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#endif
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extern qboolean bigendien;
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uint16_t _ShortSwap (uint16_t l);
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uint16_t _ShortNoSwap (uint16_t l);
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uint32_t _LongSwap (uint32_t l);
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uint32_t _LongNoSwap (uint32_t l);
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float _FloatSwap (float f);
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float _FloatNoSwap (float f);
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#ifdef __GNUC__
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#define ShortSwap(l) ({ uint16_t x = (uint16_t) (l); \
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x = ( ((x >> 8) & 0xff) \
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| ((x << 8) & 0xff00)); \
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x; })
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#define LongSwap(l) ({ uint32_t z = (uint32_t) (l); \
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z = (ShortSwap (z >> 16)) | (ShortSwap (z) << 16); \
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z; })
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#define FloatSwap(l) ({ union { uint32_t i; float f; } y; \
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y.f = (l); \
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y.i = LongSwap (y.i); \
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y.f; })
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#else
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#define ShortSwap(l) _ShortSwap (l)
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#define LongSwap(l) _LongSwap (l)
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#define FloatSwap(l) _FloatSwap (l)
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#endif
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#define ShortNoSwap(l) (l)
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#define LongNoSwap(l) (l)
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#define FloatNoSwap(l) (l)
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// NOTE: these /always/ read and write /little/ endian entities.
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struct QFile_s;
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void WriteFloat (struct QFile_s *file, float f);
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void WriteByte (struct QFile_s *file, int b);
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void WriteShort (struct QFile_s *file, unsigned int s);
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void WriteLong (struct QFile_s *file, unsigned int l);
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float ReadFloat (struct QFile_s *file);
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byte ReadByte (struct QFile_s *file);
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unsigned short ReadShort (struct QFile_s *file);
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unsigned int ReadLong (struct QFile_s *file);
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//@}
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#endif // __qendian_h
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