retro_endianness.h File Reference

#include <retro_inline.h>
#include <stdint.h>
#include <stdlib.h>

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Macros
#define	SWAP16(x)
#define	SWAP32(x)
#define	SWAP64(val)

Functions
static INLINE uint8_t	is_little_endian (void)
static INLINE uint64_t	swap_if_big64 (uint64_t val)
static INLINE uint32_t	swap_if_big32 (uint32_t val)
static INLINE uint64_t	swap_if_little64 (uint64_t val)
static INLINE uint32_t	swap_if_little32 (uint32_t val)
static INLINE uint16_t	swap_if_big16 (uint16_t val)
static INLINE uint16_t	swap_if_little16 (uint16_t val)
static INLINE void	store32be (uint32_t *addr, uint32_t data)
static INLINE uint32_t	load32be (const uint32_t *addr)

Macro Definition Documentation

SWAP16

#define SWAP16

(

x

)

Value:

((uint16_t)(                  \
         (((uint16_t)(x) & 0x00ff) << 8)      | \
         (((uint16_t)(x) & 0xff00) >> 8)        \
          ))

SWAP32

#define SWAP32

(

x

)

Value:

((uint32_t)(           \
         (((uint32_t)(x) & 0x000000ff) << 24) | \
         (((uint32_t)(x) & 0x0000ff00) <<  8) | \
         (((uint32_t)(x) & 0x00ff0000) >>  8) | \
         (((uint32_t)(x) & 0xff000000) >> 24)   \
         ))

SWAP64

#define SWAP64

(

val

)

Value:

((((uint64_t)(val) & 0x00000000000000ffULL) << 56)      \
     | (((uint64_t)(val) & 0x000000000000ff00ULL) << 40)    \
     | (((uint64_t)(val) & 0x0000000000ff0000ULL) << 24)    \
     | (((uint64_t)(val) & 0x00000000ff000000ULL) << 8)     \
     | (((uint64_t)(val) & 0x000000ff00000000ULL) >> 8)     \
     | (((uint64_t)(val) & 0x0000ff0000000000ULL) >> 24)    \
     | (((uint64_t)(val) & 0x00ff000000000000ULL) >> 40)    \
     | (((uint64_t)(val) & 0xff00000000000000ULL) >> 56))

Function Documentation

is_little_endian()

static INLINE uint8_t is_little_endian ( void  )

static

is_little_endian:

Checks if the system is little endian or big-endian.

Returns: greater than 0 if little-endian, otherwise big-endian.

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load32be()

static INLINE uint32_t load32be ( const uint32_t *  addr )

static

load32be: : pointer to unsigned 32-bit buffer

Load value from address. Endian-safe.

Returns: value from address, byte-swapped if necessary.

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store32be()

static INLINE void store32be ( uint32_t *  addr, uint32_t  data  )

static

store32be: : pointer to unsigned 32-bit buffer : unsigned 32-bit value to write

Write data to address. Endian-safe. Byteswaps the data first if necessary before storing it.

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swap_if_big16()

static INLINE uint16_t swap_if_big16 ( uint16_t  val )

static

swap_if_big16: : unsigned 16-bit value

Byteswap unsigned 16-bit value if system is big-endian.

Returns: Byteswapped value in case system is big-endian, otherwise returns same value.

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swap_if_big32()

static INLINE uint32_t swap_if_big32 ( uint32_t  val )

static

swap_if_big32: : unsigned 32-bit value

Byteswap unsigned 32-bit value if system is big-endian.

Returns: Byteswapped value in case system is big-endian, otherwise returns same value.

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swap_if_big64()

static INLINE uint64_t swap_if_big64 ( uint64_t  val )

static

swap_if_big64: : unsigned 64-bit value

Byteswap unsigned 64-bit value if system is big-endian.

Returns: Byteswapped value in case system is big-endian, otherwise returns same value.

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swap_if_little16()

static INLINE uint16_t swap_if_little16 ( uint16_t  val )

static

swap_if_little16: : unsigned 16-bit value

Byteswap unsigned 16-bit value if system is little-endian.

Returns: Byteswapped value in case system is little-endian, otherwise returns same value.

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swap_if_little32()

static INLINE uint32_t swap_if_little32 ( uint32_t  val )

static

swap_if_little32: : unsigned 32-bit value

Byteswap unsigned 32-bit value if system is little-endian.

Returns: Byteswapped value in case system is little-endian, otherwise returns same value.

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swap_if_little64()

static INLINE uint64_t swap_if_little64 ( uint64_t  val )

static

swap_if_little64: : unsigned 64-bit value

Byteswap unsigned 64-bit value if system is little-endian.

Returns: Byteswapped value in case system is little-endian, otherwise returns same value.

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