/*

SDL - Simple DirectMedia Layer

This library is free software; you can redistribute it and/or

This library 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

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

*/

/* Functions for reading and writing endian-specific values */

#ifndef _SDL_endian_h

#define _SDL_endian_h

#include "SDL_stdinc.h"

/* The two types of endianness */

#define SDL_LIL_ENDIAN 1234

#define SDL_BIG_ENDIAN 4321

#ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */

#if (defined(__i386__) || defined(__i386)) || \

defined(__ia64__) || defined(__x86_64__) || \

(defined(__alpha__) || defined(__alpha)) || \

(defined(__arm__) || defined(__thumb__)) || \

(defined(__sh__) || defined(__sh64__)) || \

(defined(__mips__) && defined(__MIPSEL__)) || \

defined(__SYMBIAN32__) || defined(__OS2__)

#define SDL_BYTEORDER SDL_LIL_ENDIAN

#else

#define SDL_BYTEORDER SDL_BIG_ENDIAN

#endif

#endif /* !SDL_BYTEORDER */

#include "begin_code.h"

/* Set up for C function definitions, even when using C++ */

#ifdef __cplusplus

extern "C" {

#endif

/* Use inline functions for compilers that support them, and static

functions for those that do not. Because these functions become

static for compilers that do not support inline functions, this

header should only be included in files that actually use them.

*/

#if defined(__GNUC__) && defined(__i386__)

static __inline__ Uint16 SDL_Swap16(Uint16 x)

__asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));

return x;

}

#elif defined(__GNUC__) && defined(__x86_64__)

static __inline__ Uint16 SDL_Swap16(Uint16 x)

{

return x;

}

static __inline__ Uint16 SDL_Swap16(Uint16 x)

{

Uint16 result;

__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));

return result;

static __inline__ Uint16 SDL_Swap16(Uint16 x)

{

__asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");

return x;

}

static __inline__ Uint16 SDL_Swap16(Uint16 x) {

return((x<<8)|(x>>8));

}

#endif

#if defined(__GNUC__) && defined(__i386__)

static __inline__ Uint32 SDL_Swap32(Uint32 x)

__asm__("bswap %0" : "=r" (x) : "0" (x));

return x;

}

#elif defined(__GNUC__) && defined(__x86_64__)

static __inline__ Uint32 SDL_Swap32(Uint32 x)

{

__asm__("bswapl %0" : "=r" (x) : "0" (x));

return x;

}

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;

return x;

}

static __inline__ Uint32 SDL_Swap32(Uint32 x) {

return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));

}

#endif

#if defined(__GNUC__) && defined(__i386__)

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(__GNUC__) && defined(__x86_64__)

static __inline__ Uint64 SDL_Swap64(Uint64 x)

{

__asm__("bswapq %0" : "=r" (x) : "0" (x));

return x;

}

#else

static __inline__ Uint64 SDL_Swap64(Uint64 x)

{

Uint32 hi, lo;

/* Separate into high and low 32-bit values and swap them */

lo = (Uint32)(x&0xFFFFFFFF);

x >>= 32;

hi = (Uint32)(x&0xFFFFFFFF);

x = SDL_Swap32(lo);

x <<= 32;

x |= SDL_Swap32(hi);

return(x);

}

#endif

#else

/* This is mainly to keep compilers from complaining in SDL code.

If there is no real 64-bit datatype, then compilers will complain about

the fake 64-bit datatype that SDL provides when it compiles user code.

*/

#define SDL_Swap64(X) (X)

#endif /* SDL_HAS_64BIT_TYPE */

/* 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

/* Ends C function definitions when using C++ */

#ifdef __cplusplus

}

#endif

#include "close_code.h"

#endif /* _SDL_endian_h */