text: // "License": Public Domain
  // I, Mathias Panzenböck, place this file hereby into the public domain. Use it at your own risk for whatever you like.
  // In case there are jurisdictions that don't support putting things in the public domain you can also consider it to
  // be "dual licensed" under the BSD, MIT and Apache licenses, if you want to. This code is trivial anyway. Consider it
  // an example on how to get the endian conversion functions on different platforms.
  
  #ifndef PORTABLE_ENDIAN_H__
  #define PORTABLE_ENDIAN_H__
  
  #if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64)) && !defined(__WINDOWS__)
  
  #   define __WINDOWS__
  
  #endif
  
  #if defined(__linux__) || defined(__CYGWIN__)
  /* Define necessary macros for the header to expose all fields. */
  #   if !defined(_BSD_SOURCE)
  #       define _BSD_SOURCE
  #   endif
  #   if !defined(__USE_BSD)
  #       define __USE_BSD
  #   endif
  #   if !defined(_DEFAULT_SOURCE)
  #       define _DEFAULT_SOURCE
  #   endif
  #   include <endian.h>
  #   include <features.h>
  /* See http://linux.die.net/man/3/endian */
  #   if defined(htobe16) && defined(htole16) && defined(be16toh) && defined(le16toh) && defined(htobe32) && defined(htole32) && defined(be32toh) && defined(htole32) && defined(htobe64) && defined(htole64) && defined(be64) && defined(le64)
  /* Do nothing. The macros we need already exist. */
  #   elif !defined(__GLIBC__) || !defined(__GLIBC_MINOR__) || ((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 9)))
  #       include <arpa/inet.h>
  #       if defined(__BYTE_ORDER) && (__BYTE_ORDER == __LITTLE_ENDIAN)
  #           if !defined(htobe16)
  #           define htobe16(x) htons(x)
  #           endif
  #           if !defined(htole16)
  #           define htole16(x) (x)
  #           endif
  #           if !defined(be16toh)
  #           define be16toh(x) ntohs(x)
  #           endif
  #           if !defined(htole16)
  #           define le16toh(x) (x)
  #           endif
  
  #           if !defined(htobe32)
  #           define htobe32(x) htonl(x)
  #           endif
  #           if !defined(htole32)
  #           define htole32(x) (x)
  #           endif
  #           if !defined(be32toh)
  #           define be32toh(x) ntohl(x)
  #           endif
  #           if !defined(le32toh)
  #           define le32toh(x) (x)
  #           endif
  
  #           if !defined(htobe64)
  #           define htobe64(x) (((uint64_t)htonl(((uint32_t)(((uint64_t)(x)) >> 32)))) | (((uint64_t)htonl(((uint32_t)(x)))) << 32))
  #           endif
  #           if !defined(htole64)
  #           define htole64(x) (x)
  #           endif
  #           if !defined(be64toh)
  #           define be64toh(x) (((uint64_t)ntohl(((uint32_t)(((uint64_t)(x)) >> 32)))) | (((uint64_t)ntohl(((uint32_t)(x)))) << 32))
  #           endif
  #           if !defined(le64toh)
  #           define le64toh(x) (x)
  #           endif
  #       elif defined(__BYTE_ORDER) && (__BYTE_ORDER == __BIG_ENDIAN)
  #           define htobe16(x) (x)
  #           define htole16(x) (((((uint16_t)(x)) >> 8))|((((uint16_t)(x)) << 8)))
  #           define be16toh(x) (x)
  #           define le16toh(x) (((((uint16_t)(x)) >> 8))|((((uint16_t)(x)) << 8)))
  
  #           define htobe32(x) (x)
  #           define htole32(x) (((uint32_t)htole16(((uint16_t)(((uint32_t)(x)) >> 16)))) | (((uint32_t)htole16(((uint16_t)(x)))) << 16))
  #           define be32toh(x) (x)
  #           define le32toh(x) (((uint32_t)le16toh(((uint16_t)(((uint32_t)(x)) >> 16)))) | (((uint32_t)le16toh(((uint16_t)(x)))) << 16))
  
  #           define htobe64(x) (x)
  #           define htole64(x) (((uint64_t)htole32(((uint32_t)(((uint64_t)(x)) >> 32)))) | (((uint64_t)htole32(((uint32_t)(x)))) << 32))
  #           define be64toh(x) (x)
  #           define le64toh(x) (((uint64_t)le32toh(((uint32_t)(((uint64_t)(x)) >> 32)))) | (((uint64_t)le32toh(((uint32_t)(x)))) << 32))
  #       else
  #           error Byte Order not supported or not defined.
  #       endif
  #   endif
  
  #elif defined(__APPLE__)
  
  #   include <libkern/OSByteOrder.h>
  
  #   define htobe16(x) OSSwapHostToBigInt16(x)
  #   define htole16(x) OSSwapHostToLittleInt16(x)
  #   define be16toh(x) OSSwapBigToHostInt16(x)
  #   define le16toh(x) OSSwapLittleToHostInt16(x)
  
  #   define htobe32(x) OSSwapHostToBigInt32(x)
  #   define htole32(x) OSSwapHostToLittleInt32(x)
  #   define be32toh(x) OSSwapBigToHostInt32(x)
  #   define le32toh(x) OSSwapLittleToHostInt32(x)
  
  #   define htobe64(x) OSSwapHostToBigInt64(x)
  #   define htole64(x) OSSwapHostToLittleInt64(x)
  #   define be64toh(x) OSSwapBigToHostInt64(x)
  #   define le64toh(x) OSSwapLittleToHostInt64(x)
  
  #   define __BYTE_ORDER    BYTE_ORDER
  #   define __BIG_ENDIAN    BIG_ENDIAN
  #   define __LITTLE_ENDIAN LITTLE_ENDIAN
  #   define __PDP_ENDIAN    PDP_ENDIAN
  
  #elif defined(__OpenBSD__)
  
  #   include <sys/endian.h>
  
  #elif defined(__HAIKU__)
  
  #   include <endian.h>
  
  #elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
  
  #   include <sys/endian.h>
  
  #   if !defined(be16toh)
      #   define be16toh(x) betoh16(x)
      #   define le16toh(x) letoh16(x)
  #   endif
  
  #   if !defined(be32toh)
      #   define be32toh(x) betoh32(x)
      #   define le32toh(x) letoh32(x)
  #   endif
  
  #   if !defined(be64toh)
      #   define be64toh(x) betoh64(x)
      #   define le64toh(x) letoh64(x)
  #   endif
  
  #elif defined(__WINDOWS__)
  
  #   if BYTE_ORDER == LITTLE_ENDIAN
  
  #       define htobe16(x) _byteswap_ushort(x)
  #       define htole16(x) (x)
  #       define be16toh(x) _byteswap_ushort(x)
  #       define le16toh(x) (x)
  
  #       define htobe32(x) _byteswap_ulong(x)
  #       define htole32(x) (x)
  #       define be32toh(x) _byteswap_ulong(x)
  #       define le32toh(x) (x)
  
  #       define htobe64(x) _byteswap_uint64(x)
  #       define be64toh(x) _byteswap_uint64(x)
  #       define htole64(x) (x)
  #       define le64toh(x) (x)
  
  #   elif BYTE_ORDER == BIG_ENDIAN
  
          /* that would be xbox 360 */
  #       define htobe16(x) (x)
  #       define htole16(x) __builtin_bswap16(x)
  #       define be16toh(x) (x)
  #       define le16toh(x) __builtin_bswap16(x)
  
  #       define htobe32(x) (x)
  #       define htole32(x) __builtin_bswap32(x)
  #       define be32toh(x) (x)
  #       define le32toh(x) __builtin_bswap32(x)
  
  #       define htobe64(x) (x)
  #       define htole64(x) __builtin_bswap64(x)
  #       define be64toh(x) (x)
  #       define le64toh(x) __builtin_bswap64(x)
  
  #   else
  
  #       error byte order not supported
  
  #   endif
  
  #   define __BYTE_ORDER    BYTE_ORDER
  #   define __BIG_ENDIAN    BIG_ENDIAN
  #   define __LITTLE_ENDIAN LITTLE_ENDIAN
  #   define __PDP_ENDIAN    PDP_ENDIAN
  
  #elif defined(__sun)
  
  #   include <sys/byteorder.h>
  
  #   define htobe16(x) BE_16(x)
  #   define htole16(x) LE_16(x)
  #   define be16toh(x) BE_16(x)
  #   define le16toh(x) LE_16(x)
  
  #   define htobe32(x) BE_32(x)
  #   define htole32(x) LE_32(x)
  #   define be32toh(x) BE_32(x)
  #   define le32toh(x) LE_32(x)
  
  #   define htobe64(x) BE_64(x)
  #   define htole64(x) LE_64(x)
  #   define be64toh(x) BE_64(x)
  #   define le64toh(x) LE_64(x)
  
  #elif defined _AIX      /* AIX is always big endian */
  #       define be64toh(x) (x)
  #       define be32toh(x) (x)
  #       define be16toh(x) (x)
  #       define le32toh(x)                              \
           ((((x) & 0xff) << 24) |                 \
             (((x) & 0xff00) << 8) |                \
             (((x) & 0xff0000) >> 8) |              \
             (((x) & 0xff000000) >> 24))
  #       define   le64toh(x)                               \
           ((((x) & 0x00000000000000ffL) << 56) |   \
            (((x) & 0x000000000000ff00L) << 40) |   \
            (((x) & 0x0000000000ff0000L) << 24) |   \
            (((x) & 0x00000000ff000000L) << 8)  |   \
            (((x) & 0x000000ff00000000L) >> 8)  |   \
            (((x) & 0x0000ff0000000000L) >> 24) |   \
            (((x) & 0x00ff000000000000L) >> 40) |   \
            (((x) & 0xff00000000000000L) >> 56))
  #       ifndef htobe64
  #               define htobe64(x) be64toh(x)
  #       endif
  #       ifndef htobe32
  #               define htobe32(x) be32toh(x)
  #       endif
  #       ifndef htobe16
  #               define htobe16(x) be16toh(x)
  #       endif
  
  
  #else
  
  #   error platform not supported
  
  #endif
  
  #endif
  