SDL  2.0
SDL_endian.h File Reference
#include "SDL_stdinc.h"
#include "begin_code.h"
#include "close_code.h"
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Go to the source code of this file.

Macros

Swap to native

Byteswap item from the specified endianness to the native endianness.

#define SDL_SwapLE16(X)   (X)
 
#define SDL_SwapLE32(X)   (X)
 
#define SDL_SwapLE64(X)   (X)
 
#define SDL_SwapFloatLE(X)   (X)
 
#define SDL_SwapBE16(X)   SDL_Swap16(X)
 
#define SDL_SwapBE32(X)   SDL_Swap32(X)
 
#define SDL_SwapBE64(X)   SDL_Swap64(X)
 
#define SDL_SwapFloatBE(X)   SDL_SwapFloat(X)
 

The two types of endianness

#define SDL_LIL_ENDIAN   1234
 
#define SDL_BIG_ENDIAN   4321
 
#define SDL_BYTEORDER   SDL_LIL_ENDIAN
 
#define HAS_BUILTIN_BSWAP16   0
 
#define HAS_BUILTIN_BSWAP32   0
 
#define HAS_BUILTIN_BSWAP64   0
 
#define HAS_BROKEN_BSWAP   0
 
SDL_FORCE_INLINE Uint16 SDL_Swap16 (Uint16 x)
 
SDL_FORCE_INLINE Uint32 SDL_Swap32 (Uint32 x)
 
SDL_FORCE_INLINE Uint64 SDL_Swap64 (Uint64 x)
 
SDL_FORCE_INLINE float SDL_SwapFloat (float x)
 

Detailed Description

Functions for reading and writing endian-specific values

Definition in file SDL_endian.h.

Macro Definition Documentation

◆ HAS_BROKEN_BSWAP

#define HAS_BROKEN_BSWAP   0

Definition at line 107 of file SDL_endian.h.

◆ HAS_BUILTIN_BSWAP16

#define HAS_BUILTIN_BSWAP16   0

Definition at line 104 of file SDL_endian.h.

◆ HAS_BUILTIN_BSWAP32

#define HAS_BUILTIN_BSWAP32   0

Definition at line 105 of file SDL_endian.h.

◆ HAS_BUILTIN_BSWAP64

#define HAS_BUILTIN_BSWAP64   0

Definition at line 106 of file SDL_endian.h.

◆ SDL_BIG_ENDIAN

#define SDL_BIG_ENDIAN   4321

Definition at line 55 of file SDL_endian.h.

◆ SDL_BYTEORDER

#define SDL_BYTEORDER   SDL_LIL_ENDIAN

Definition at line 76 of file SDL_endian.h.

◆ SDL_LIL_ENDIAN

#define SDL_LIL_ENDIAN   1234

Definition at line 54 of file SDL_endian.h.

◆ SDL_SwapBE16

#define SDL_SwapBE16 (   X)    SDL_Swap16(X)

Definition at line 293 of file SDL_endian.h.

◆ SDL_SwapBE32

#define SDL_SwapBE32 (   X)    SDL_Swap32(X)

Definition at line 294 of file SDL_endian.h.

◆ SDL_SwapBE64

#define SDL_SwapBE64 (   X)    SDL_Swap64(X)

Definition at line 295 of file SDL_endian.h.

◆ SDL_SwapFloatBE

#define SDL_SwapFloatBE (   X)    SDL_SwapFloat(X)

Definition at line 296 of file SDL_endian.h.

◆ SDL_SwapFloatLE

#define SDL_SwapFloatLE (   X)    (X)

Definition at line 292 of file SDL_endian.h.

◆ SDL_SwapLE16

#define SDL_SwapLE16 (   X)    (X)

Definition at line 289 of file SDL_endian.h.

◆ SDL_SwapLE32

#define SDL_SwapLE32 (   X)    (X)

Definition at line 290 of file SDL_endian.h.

◆ SDL_SwapLE64

#define SDL_SwapLE64 (   X)    (X)

Definition at line 291 of file SDL_endian.h.

Function Documentation

◆ SDL_Swap16()

SDL_FORCE_INLINE Uint16 SDL_Swap16 ( Uint16  x)

Definition at line 153 of file SDL_endian.h.

154 {
155  return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
156 }
uint16_t Uint16
Definition: SDL_stdinc.h:208
#define SDL_static_cast(type, expression)
Definition: SDL_stdinc.h:155

References SDL_static_cast.

◆ SDL_Swap32()

SDL_FORCE_INLINE Uint32 SDL_Swap32 ( Uint32  x)

Definition at line 204 of file SDL_endian.h.

205 {
206  return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
207  ((x >> 8) & 0x0000FF00) | (x >> 24)));
208 }
uint32_t Uint32
Definition: SDL_stdinc.h:220

References SDL_static_cast.

Referenced by SDL_Swap64(), and SDL_SwapFloat().

◆ SDL_Swap64()

SDL_FORCE_INLINE Uint64 SDL_Swap64 ( Uint64  x)

Definition at line 249 of file SDL_endian.h.

250 {
251  Uint32 hi, lo;
252 
253  /* Separate into high and low 32-bit values and swap them */
254  lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
255  x >>= 32;
256  hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
257  x = SDL_Swap32(lo);
258  x <<= 32;
259  x |= SDL_Swap32(hi);
260  return (x);
261 }
SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x)
Definition: SDL_endian.h:204

References SDL_static_cast, and SDL_Swap32().

◆ SDL_SwapFloat()

SDL_FORCE_INLINE float SDL_SwapFloat ( float  x)

Definition at line 266 of file SDL_endian.h.

267 {
268  union {
269  float f;
270  Uint32 ui32;
271  } swapper;
272  swapper.f = x;
273  swapper.ui32 = SDL_Swap32(swapper.ui32);
274  return swapper.f;
275 }

References SDL_Swap32().