/* Simple DirectMedia Layer Copyright (C) 1997-2021 Sam Lantinga This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution. */ /* These headers are from sdl12-compat, and are intended to give just enough functionality to let you build an SDL-1.2-based project without having the real SDL-1.2 available to you. */ #ifndef _SDL_endian_h #define _SDL_endian_h #include "SDL_stdinc.h" #if defined(_MSC_VER) && (_MSC_VER >= 1400) #include #endif /* This is all lifted out of SDL2's zlib-licensed headers. */ #define SDL_LIL_ENDIAN 1234 #define SDL_BIG_ENDIAN 4321 #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ #ifdef __linux__ #include #define SDL_BYTEORDER __BYTE_ORDER #elif defined(__OpenBSD__) #include #define SDL_BYTEORDER BYTE_ORDER #elif defined(__FreeBSD__) || defined(__NetBSD__) #include #define SDL_BYTEORDER BYTE_ORDER #else #if defined(__hppa__) || \ defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ (defined(__MIPS__) && defined(__MIPSEB__)) || \ defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \ defined(__sparc__) #define SDL_BYTEORDER SDL_BIG_ENDIAN #else #define SDL_BYTEORDER SDL_LIL_ENDIAN #endif #endif /* __linux__ */ #endif /* !SDL_BYTEORDER */ #include "begin_code.h" /* various modern compilers may have builtin swap */ #if defined (__has_builtin) #define _SDL_HAS_BUILTIN(x) __has_builtin(x) #else #define _SDL_HAS_BUILTIN(x) 0 #endif #if defined(__GNUC__) || defined(__clang__) # define HAS_BUILTIN_BSWAP16 (_SDL_HAS_BUILTIN(__builtin_bswap16)) || \ (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) # define HAS_BUILTIN_BSWAP32 (_SDL_HAS_BUILTIN(__builtin_bswap32)) || \ (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) # define HAS_BUILTIN_BSWAP64 (_SDL_HAS_BUILTIN(__builtin_bswap64)) || \ (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) /* this one is broken */ # define HAS_BROKEN_BSWAP (__GNUC__ == 2 && __GNUC_MINOR__ <= 95) #else # define HAS_BUILTIN_BSWAP16 0 # define HAS_BUILTIN_BSWAP32 0 # define HAS_BUILTIN_BSWAP64 0 # define HAS_BROKEN_BSWAP 0 #endif #if HAS_BUILTIN_BSWAP16 #define SDL_Swap16(x) __builtin_bswap16(x) #elif defined(_MSC_VER) && (_MSC_VER >= 1400) #pragma intrinsic(_byteswap_ushort) #define SDL_Swap16(x) _byteswap_ushort(x) #elif defined(__i386__) && !HAS_BROKEN_BSWAP static __inline__ Uint16 SDL_Swap16(Uint16 x) { __asm__("xchgb %b0,%h0": "=q"(x):"0"(x)); return x; } #elif defined(__x86_64__) static __inline__ Uint16 SDL_Swap16(Uint16 x) { __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x)); return x; } #elif (defined(__powerpc__) || defined(__ppc__)) static __inline__ Uint16 SDL_Swap16(Uint16 x) { int result; __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x)); return (Uint16)result; } #elif (defined(__m68k__) && !defined(__mcoldfire__)) static __inline__ Uint16 SDL_Swap16(Uint16 x) { __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc"); return x; } #elif defined(__WATCOMC__) && defined(__386__) extern __inline Uint16 SDL_Swap16(Uint16); #pragma aux SDL_Swap16 = \ "xchg al, ah" \ parm [ax] \ modify [ax]; #else static __inline__ Uint16 SDL_Swap16(Uint16 x) { return SDL_static_cast(Uint16, ((x << 8) | (x >> 8))); } #endif #if HAS_BUILTIN_BSWAP32 #define SDL_Swap32(x) __builtin_bswap32(x) #elif defined(_MSC_VER) && (_MSC_VER >= 1400) #pragma intrinsic(_byteswap_ulong) #define SDL_Swap32(x) _byteswap_ulong(x) #elif defined(__i386__) && !HAS_BROKEN_BSWAP static __inline__ Uint32 SDL_Swap32(Uint32 x) { __asm__("bswap %0": "=r"(x):"0"(x)); return x; } #elif defined(__x86_64__) static __inline__ Uint32 SDL_Swap32(Uint32 x) { __asm__("bswapl %0": "=r"(x):"0"(x)); return x; } #elif (defined(__powerpc__) || defined(__ppc__)) static __inline__ Uint32 SDL_Swap32(Uint32 x) { Uint32 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; } #elif (defined(__m68k__) && !defined(__mcoldfire__)) static __inline__ Uint32 SDL_Swap32(Uint32 x) { __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc"); return x; } #elif defined(__WATCOMC__) && defined(__386__) extern __inline Uint32 SDL_Swap32(Uint32); #pragma aux SDL_Swap32 = \ "bswap eax" \ parm [eax] \ modify [eax]; #else static __inline__ Uint32 SDL_Swap32(Uint32 x) { return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | (x >> 24))); } #endif #if HAS_BUILTIN_BSWAP64 #define SDL_Swap64(x) __builtin_bswap64(x) #elif defined(_MSC_VER) && (_MSC_VER >= 1400) #pragma intrinsic(_byteswap_uint64) #define SDL_Swap64(x) _byteswap_uint64(x) #elif defined(__i386__) && !HAS_BROKEN_BSWAP static __inline__ Uint64 SDL_Swap64(Uint64 x) { union { struct { Uint32 a, b; } s; Uint64 u; } v; v.u = x; __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" : "=r"(v.s.a), "=r"(v.s.b) : "0" (v.s.a), "1"(v.s.b)); return v.u; } #elif defined(__x86_64__) static __inline__ Uint64 SDL_Swap64(Uint64 x) { __asm__("bswapq %0": "=r"(x):"0"(x)); return x; } #elif defined(__WATCOMC__) && defined(__386__) extern __inline Uint64 SDL_Swap64(Uint64); #pragma aux SDL_Swap64 = \ "bswap eax" \ "bswap edx" \ "xchg eax,edx" \ parm [eax edx] \ modify [eax edx]; #else static __inline__ Uint64 SDL_Swap64(Uint64 x) { Uint32 hi, lo; /* Separate into high and low 32-bit values and swap them */ lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF); x >>= 32; hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF); x = SDL_Swap32(lo); x <<= 32; x |= SDL_Swap32(hi); return (x); } #endif /* remove extra macros */ #undef HAS_BROKEN_BSWAP #undef HAS_BUILTIN_BSWAP16 #undef HAS_BUILTIN_BSWAP32 #undef HAS_BUILTIN_BSWAP64 #undef _SDL_HAS_BUILTIN /** * \name Swap to native * Byteswap item from the specified endianness to the native endianness. */ /* @{ */ #if SDL_BYTEORDER == SDL_LIL_ENDIAN #define SDL_SwapLE16(X) (X) #define SDL_SwapLE32(X) (X) #define SDL_SwapLE64(X) (X) #define SDL_SwapBE16(X) SDL_Swap16(X) #define SDL_SwapBE32(X) SDL_Swap32(X) #define SDL_SwapBE64(X) SDL_Swap64(X) #else #define SDL_SwapLE16(X) SDL_Swap16(X) #define SDL_SwapLE32(X) SDL_Swap32(X) #define SDL_SwapLE64(X) SDL_Swap64(X) #define SDL_SwapBE16(X) (X) #define SDL_SwapBE32(X) (X) #define SDL_SwapBE64(X) (X) #endif /* @} *//* Swap to native */ #include "close_code.h" #endif /* _SDL_endian_h */