mirror of
https://git.do.srb2.org/STJr/UltimateZoneBuilder.git
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128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
//------------------------------------------------------------------------
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// EDGE Endian handling
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//------------------------------------------------------------------------
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//
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// Eureka DOOM Editor
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//
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// Copyright (C) 2006-2008 Andrew Apted
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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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//------------------------------------------------------------------------
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//
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// Using code from SDL_byteorder.h and SDL_endian.h.
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// Copyright (C) 1997-2004 Sam Lantinga.
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//
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//------------------------------------------------------------------------
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#ifndef __SYS_ENDIAN_H__
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#define __SYS_ENDIAN_H__
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// ---- determine byte order ----
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#define UT_LIL_ENDIAN 1234
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#define UT_BIG_ENDIAN 4321
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#if defined(__LITTLE_ENDIAN__) || defined(WIN32) || \
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defined(__i386__) || defined(__i386) || \
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defined(__ia64__) || defined(__x86_64__) || \
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defined(__alpha__) || defined(__alpha) || \
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defined(__arm__) || defined(__SYMBIAN32__) || \
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(defined(__mips__) && defined(__MIPSEL__))
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#define UT_BYTEORDER UT_LIL_ENDIAN
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#else
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#define UT_BYTEORDER UT_BIG_ENDIAN
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#endif
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// ---- the gruntwork of swapping ----
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#if defined(__GNUC__) && defined(__i386__)
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static inline u16_t UT_Swap16(u16_t x)
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{
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__asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
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return x;
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}
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#elif defined(__GNUC__) && defined(__x86_64__)
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static inline u16_t UT_Swap16(u16_t x)
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{
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__asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x));
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return x;
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}
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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static inline u16_t UT_Swap16(u16_t x)
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{
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u16_t result;
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__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
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return result;
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}
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#else
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static inline u16_t UT_Swap16(u16_t x) {
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return((x<<8)|(x>>8));
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}
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#endif
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#if defined(__GNUC__) && defined(__i386__)
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static inline u32_t UT_Swap32(u32_t x)
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{
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__asm__("bswap %0" : "=r" (x) : "0" (x));
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return x;
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}
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#elif defined(__GNUC__) && defined(__x86_64__)
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static inline u32_t UT_Swap32(u32_t x)
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{
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__asm__("bswapl %0" : "=r" (x) : "0" (x));
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return x;
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}
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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static inline u32_t UT_Swap32(u32_t x)
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{
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u32_t result;
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__asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
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__asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
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__asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
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return result;
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}
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#else
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static inline u32_t UT_Swap32(u32_t x) {
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return ((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
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}
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#endif
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// ---- byte swap from specified endianness to native ----
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#if (UT_BYTEORDER == UT_LIL_ENDIAN)
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#define LE_U16(X) ((u16_t)(X))
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#define LE_U32(X) ((u32_t)(X))
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#define BE_U16(X) UT_Swap16(X)
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#define BE_U32(X) UT_Swap32(X)
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#else
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#define LE_U16(X) UT_Swap16(X)
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#define LE_U32(X) UT_Swap32(X)
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#define BE_U16(X) ((u16_t)(X))
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#define BE_U32(X) ((u32_t)(X))
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#endif
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// signed versions of the above
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#define LE_S16(X) ((s16_t) LE_U16((u16_t) (X)))
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#define LE_S32(X) ((s32_t) LE_U32((u32_t) (X)))
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#define BE_S16(X) ((s16_t) BE_U16((u16_t) (X)))
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#define BE_S32(X) ((s32_t) BE_U32((u32_t) (X)))
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#endif // __SYS_ENDIAN_H__
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//--- editor settings ---
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// vi:ts=4:sw=4:noexpandtab
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