28 

    29 

    30 /* check compiler requirements */

    31 #if !defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)

    32 #error Do not know the endianess of this architecture

    33 #endif

    34 

    35 

    36 /* use byteswap macros from the host system, hopefully optimized ones ;-) 

    37  * or define our own version, simple, stupid, straight-forward... */

    38 #ifdef HAVE_BYTESWAP_H

    39 #include <byteswap.h>

    40 #else        

    41 #define bswap_16(x)	((((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8))

    42 #define bswap_32(x)	((((x) & 0xFF000000) >> 24) | (((x) & 0x00FF0000) >> 8)  | \

    43 (((x) & 0x0000FF00) << 8)  | (((x) & 0x000000FF) << 24) )

    44 #endif /* HAVE_BYTESWAP_H */

    45 

    46 

    47 /* swap numbers accordingly to architecture automatically */

    48 #ifdef __LITTLE_ENDIAN__

    49 #define ENDIAN_LITTLE_32(x) x

    50 #define ENDIAN_BIG_32(x)    bswap_32(x)

    51 #define ENDIAN_LITTLE_16(x) x

    52 #define ENDIAN_BIG_16(x)    bswap_16(x)

    53 #elif __BIG_ENDIAN__

    54 #define ENDIAN_LITTLE_32(x) bswap_32(x)

    55 #define ENDIAN_BIG_32(x)    x

    56 #define ENDIAN_LITTLE_16(x) bswap_16(x)

    57 #define ENDIAN_BIG_16(x)    x    

    58 #endif