endian detection lib/crypto/aes/aesopts.h

[Jeffrey Altman]

The following code was pulled up to the 1-3 branch but barfs on 
Windows.  In other words "#error 'barf'"
is being triggered. 



/*  2. BYTE ORDER IN 32-BIT WORDS

    To obtain the highest speed on processors with 32-bit words, this code
    needs to determine the order in which bytes are packed into such words.
    The following block of code is an attempt to capture the most obvious
    ways in which various environemnts specify heir endian definitions. It
    may well fail, in which case the definitions will need to be set by
    editing at the points marked **** EDIT HERE IF NECESSARY **** below.
*/
#define AES_LITTLE_ENDIAN   1234 /* byte 0 is least significant (i386) */
#define AES_BIG_ENDIAN      4321 /* byte 0 is most significant (mc68k) */

#if !defined(PLATFORM_BYTE_ORDER)
#if defined(LITTLE_ENDIAN) || defined(BIG_ENDIAN)
#  if defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN)
#    if defined(BYTE_ORDER)
#      if   (BYTE_ORDER == LITTLE_ENDIAN)
#        define PLATFORM_BYTE_ORDER AES_LITTLE_ENDIAN
#      elif (BYTE_ORDER == BIG_ENDIAN)
#        define PLATFORM_BYTE_ORDER AES_BIG_ENDIAN
#      endif
#    endif
#  elif defined(LITTLE_ENDIAN) && !defined(BIG_ENDIAN)
#    define PLATFORM_BYTE_ORDER AES_LITTLE_ENDIAN
#  elif !defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN)
#    define PLATFORM_BYTE_ORDER AES_BIG_ENDIAN
#  endif
#elif defined(_LITTLE_ENDIAN) || defined(_BIG_ENDIAN)
#  if defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN)
#    if defined(_BYTE_ORDER)
#      if   (_BYTE_ORDER == _LITTLE_ENDIAN)
#        define PLATFORM_BYTE_ORDER AES_LITTLE_ENDIAN
#      elif (_BYTE_ORDER == _BIG_ENDIAN)
#        define PLATFORM_BYTE_ORDER AES_BIG_ENDIAN
#      endif
#    endif
#  elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
#    define PLATFORM_BYTE_ORDER AES_LITTLE_ENDIAN
#  elif !defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN)
#    define PLATFORM_BYTE_ORDER AES_BIG_ENDIAN
#  endif
#elif 0     /* **** EDIT HERE IF NECESSARY **** */
#define PLATFORM_BYTE_ORDER AES_LITTLE_ENDIAN
#elif 0     /* **** EDIT HERE IF NECESSARY **** */
#define PLATFORM_BYTE_ORDER AES_BIG_ENDIAN
#else
# error "barf"
/*#elif (('1234' >> 24) == '1')
#  define PLATFORM_BYTE_ORDER AES_LITTLE_ENDIAN
#elif (('4321' >> 24) == '1')
#  define PLATFORM_BYTE_ORDER AES_BIG_ENDIAN*/
#endif
#endif