68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/*
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* code to swap bytes because of big/little endian problems.
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* contains the macros:
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* SWAP{INT,SHORT}(x): returns a swapped version of x
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* INTEL_{INT,SHORT}(x): returns x after conversion to/from little endian
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* GET_INTEL_{INT,SHORT}(src): gets value from little-endian buffer src
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* PUT_INTEL_{INT,SHORT}(dest, src): puts src into little-endian buffer dest
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*
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* the GET/PUT macros are safe to use on platforms which segfault on unaligned word access
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*
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*/
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#ifndef _BYTESWAP_H
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#define _BYTESWAP_H
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#include "pstypes.h"
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#define SWAPSHORT(x) (((ubyte)(x) << 8) | (((ushort)(x)) >> 8))
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#define SWAPINT(x) (((x)<<24) | (((uint)(x)) >> 24) | (((x) &0x0000ff00) << 8) | (((x) & 0x00ff0000) >> 8))
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#ifndef WORDS_BIGENDIAN
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#define INTEL_INT(x) x
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#define INTEL_SHORT(x) x
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#else // ! WORDS_BIGENDIAN
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#define INTEL_INT(x) SWAPINT(x)
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#define INTEL_SHORT(x) SWAPSHORT(x)
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#endif // ! WORDS_BIGENDIAN
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#ifndef WORDS_NEED_ALIGNMENT
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#define GET_INTEL_INT(s) INTEL_INT(*(uint *)(s))
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#define GET_INTEL_SHORT(s) INTEL_SHORT(*(ushort *)(s))
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#define PUT_INTEL_INT(d, s) { *(uint *)(d) = INTEL_INT((uint)(s)); }
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#define PUT_INTEL_SHORT(d, s) { *(ushort *)(d) = INTEL_SHORT((ushort)(s)); }
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#else // ! WORDS_NEED_ALIGNMENT
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static inline uint GET_INTEL_INT(void *s)
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{
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uint tmp;
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memcpy((void *)&tmp, s, 4);
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return INTEL_INT(tmp);
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}
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static inline uint GET_INTEL_SHORT(void *s)
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{
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ushort tmp;
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memcpy((void *)&tmp, s, 2);
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return INTEL_SHORT(tmp);
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}
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#define PUT_INTEL_INT(d, s) { uint tmp = INTEL_INT(s); \
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memcpy((void *)(d), (void *)&tmp, 4); }
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#define PUT_INTEL_SHORT(d, s) { ushort tmp = INTEL_SHORT(s); \
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memcpy((void *)(d), (void *)&tmp, 2); }
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#endif // ! WORDS_NEED_ALIGNMENT
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#endif // ! _BYTESWAP_H
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