mirror of
https://git.do.srb2.org/STJr/UltimateZoneBuilder.git
synced 2024-11-26 22:01:45 +00:00
128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
//------------------------------------------------------------------------
|
|
// EDGE Endian handling
|
|
//------------------------------------------------------------------------
|
|
//
|
|
// Eureka DOOM Editor
|
|
//
|
|
// Copyright (C) 2006-2008 Andrew Apted
|
|
//
|
|
// 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.
|
|
//
|
|
//------------------------------------------------------------------------
|
|
//
|
|
// Using code from SDL_byteorder.h and SDL_endian.h.
|
|
// Copyright (C) 1997-2004 Sam Lantinga.
|
|
//
|
|
//------------------------------------------------------------------------
|
|
|
|
#ifndef __SYS_ENDIAN_H__
|
|
#define __SYS_ENDIAN_H__
|
|
|
|
|
|
// ---- determine byte order ----
|
|
|
|
#define UT_LIL_ENDIAN 1234
|
|
#define UT_BIG_ENDIAN 4321
|
|
|
|
#if defined(__LITTLE_ENDIAN__) || defined(WIN32) || \
|
|
defined(__i386__) || defined(__i386) || \
|
|
defined(__ia64__) || defined(__x86_64__) || \
|
|
defined(__alpha__) || defined(__alpha) || \
|
|
defined(__arm__) || defined(__SYMBIAN32__) || \
|
|
(defined(__mips__) && defined(__MIPSEL__))
|
|
#define UT_BYTEORDER UT_LIL_ENDIAN
|
|
#else
|
|
#define UT_BYTEORDER UT_BIG_ENDIAN
|
|
#endif
|
|
|
|
|
|
// ---- the gruntwork of swapping ----
|
|
|
|
#if defined(__GNUC__) && defined(__i386__)
|
|
static inline u16_t UT_Swap16(u16_t x)
|
|
{
|
|
__asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
|
|
return x;
|
|
}
|
|
#elif defined(__GNUC__) && defined(__x86_64__)
|
|
static inline u16_t UT_Swap16(u16_t x)
|
|
{
|
|
__asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x));
|
|
return x;
|
|
}
|
|
#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
|
|
static inline u16_t UT_Swap16(u16_t x)
|
|
{
|
|
u16_t result;
|
|
|
|
__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
|
|
return result;
|
|
}
|
|
#else
|
|
static inline u16_t UT_Swap16(u16_t x) {
|
|
return((x<<8)|(x>>8));
|
|
}
|
|
#endif
|
|
|
|
#if defined(__GNUC__) && defined(__i386__)
|
|
static inline u32_t UT_Swap32(u32_t x)
|
|
{
|
|
__asm__("bswap %0" : "=r" (x) : "0" (x));
|
|
return x;
|
|
}
|
|
#elif defined(__GNUC__) && defined(__x86_64__)
|
|
static inline u32_t UT_Swap32(u32_t x)
|
|
{
|
|
__asm__("bswapl %0" : "=r" (x) : "0" (x));
|
|
return x;
|
|
}
|
|
#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
|
|
static inline u32_t UT_Swap32(u32_t x)
|
|
{
|
|
u32_t result;
|
|
|
|
__asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
|
|
__asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
|
|
__asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
|
|
return result;
|
|
}
|
|
#else
|
|
static inline u32_t UT_Swap32(u32_t x) {
|
|
return ((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
|
|
}
|
|
#endif
|
|
|
|
|
|
// ---- byte swap from specified endianness to native ----
|
|
|
|
#if (UT_BYTEORDER == UT_LIL_ENDIAN)
|
|
#define LE_U16(X) ((u16_t)(X))
|
|
#define LE_U32(X) ((u32_t)(X))
|
|
#define BE_U16(X) UT_Swap16(X)
|
|
#define BE_U32(X) UT_Swap32(X)
|
|
#else
|
|
#define LE_U16(X) UT_Swap16(X)
|
|
#define LE_U32(X) UT_Swap32(X)
|
|
#define BE_U16(X) ((u16_t)(X))
|
|
#define BE_U32(X) ((u32_t)(X))
|
|
#endif
|
|
|
|
// signed versions of the above
|
|
#define LE_S16(X) ((s16_t) LE_U16((u16_t) (X)))
|
|
#define LE_S32(X) ((s32_t) LE_U32((u32_t) (X)))
|
|
#define BE_S16(X) ((s16_t) BE_U16((u16_t) (X)))
|
|
#define BE_S32(X) ((s32_t) BE_U32((u32_t) (X)))
|
|
|
|
|
|
#endif // __SYS_ENDIAN_H__
|
|
|
|
//--- editor settings ---
|
|
// vi:ts=4:sw=4:noexpandtab
|