100 lines
3.8 KiB
C++
100 lines
3.8 KiB
C++
/*
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* Portions of this file are copyright Rebirth contributors and licensed as
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* described in COPYING.txt.
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* Portions of this file are copyright Parallax Software and licensed
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* according to the Parallax license below.
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* See COPYING.txt for license details.
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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{INT64,INT,SHORT}(x): returns a swapped version of x
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* INTEL_{INT64,INT,SHORT}(x): returns x after conversion to/from little endian
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* GET_INTEL_{INT64,INT,SHORT}(src): gets value from little-endian buffer src
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* PUT_INTEL_{INT64,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 <cstdint>
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#include <string.h> // for memcpy
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#include "pstypes.h"
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static inline uint16_t SWAPSHORT(const uint16_t &x)
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{
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return (x << 8) | (x >> 8);
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}
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static inline int16_t SWAPSHORT(const int16_t &i)
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{
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return SWAPSHORT(static_cast<uint16_t>(i));
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}
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static inline uint32_t SWAPINT(const uint32_t &x)
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{
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return (x << 24) | (x >> 24) | ((x & 0xff00) << 8) | ((x >> 8) & 0xff00);
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}
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static inline int32_t SWAPINT(const int32_t &i)
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{
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return SWAPINT(static_cast<uint32_t>(i));
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}
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#ifndef macintosh
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#define SWAPINT64(x) ((((x) & 0xff00000000000000LL) >> 56) | (((x) & 0x00ff000000000000LL) >> 40) | (((x) & 0x0000ff0000000000LL) >> 24) | (((x) & 0x000000ff00000000LL) >> 8) | (((x) & 0x00000000ff000000LL) << 8) | (((x) & 0x0000000000ff0000LL) << 24) | (((x) & 0x000000000000ff00LL) << 40) | (((x) & 0x00000000000000ffLL) << 56))
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#else
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#define SWAPINT64(x) ((((x) & 0xff00000000000000LL)/(2^56)) | (((x) & 0x00ff000000000000LL)/(2^40)) | (((x) & 0x0000ff0000000000LL)/(2^24)) | (((x) & 0x000000ff00000000LL)/(2^8)) | (((x) & 0x00000000ff000000LL)*(2^8)) | (((x) & 0x0000000000ff0000LL)*(2^24)) | (((x) & 0x000000000000ff00LL)*(2^40)) | (((x) & 0x00000000000000ffLL)*(2^56)))
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#endif
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#ifndef WORDS_BIGENDIAN
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#define INTEL_INT64(x) x
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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_INT64(x) SWAPINT64(x)
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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(*(const uint *)(s))
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#define GET_INTEL_SHORT(s) INTEL_SHORT(*(const 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(const 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 ushort GET_INTEL_SHORT(const 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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