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portable_endian.hpp
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// (c) Mathias Panzenböck
// http://github.com/panzi/mathfun/blob/master/examples/portable_endian.h
//
#pragma once
#if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64)) && !defined(__WINDOWS__)
# define __WINDOWS__
#endif
// use standard posix style headers for apple emscripten builds as well since emscripten sdk now ships its own
// libc headers
#if defined(__linux__) || defined(__CYGWIN__) || defined(__EMSCRIPTEN__)
# include <endian.h>
#elif defined(__APPLE__)
# include <machine/endian.h>
# include <libkern/OSByteOrder.h>
# define htobe16 OSSwapHostToBigInt16
# define htole16 OSSwapHostToLittleInt16
# define be16toh OSSwapBigToHostInt16
# define le16toh OSSwapLittleToHostInt16
# define htobe32 OSSwapHostToBigInt32
# define htole32 OSSwapHostToLittleInt32
# define be32toh OSSwapBigToHostInt32
# define le32toh OSSwapLittleToHostInt32
# define htobe64 OSSwapHostToBigInt64
# define htole64 OSSwapHostToLittleInt64
# define be64toh OSSwapBigToHostInt64
# define le64toh OSSwapLittleToHostInt64
/**
# define __BYTE_ORDER BYTE_ORDER
# define __BIG_ENDIAN BIG_ENDIAN
# define __LITTLE_ENDIAN LITTLE_ENDIAN
# define __PDP_ENDIAN PDP_ENDIAN
**/
#elif defined(__OpenBSD__)|| defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
# if defined __has_include && __has_include (<sys/endian.h>)
# include <sys/endian.h>
# elif defined __has_include && __has_include (<endian.h>)
# include <endian.h>
# else
# define be16toh betoh16
# define le16toh letoh16
# define be32toh betoh32
# define le32toh letoh32
# define be64toh betoh64
# define le64toh letoh64
# endif
#elif defined(__WINDOWS__)
# include <winsock2.h>
# if BYTE_ORDER == LITTLE_ENDIAN
# define htobe16 htons
# define htole16(x) (x)
# define be16toh ntohs
# define le16toh(x) (x)
# define htobe32 htonl
# define htole32(x) (x)
# define be32toh ntohl
# define le32toh(x) (x)
# define htole64(x) (x)
# define le64toh(x) (x)
# ifndef __MINGW32__
# define be64toh ntohll
# define htobe64 htonll
# else
# define be64toh(x) ((((uint64_t)ntohl((x) & 0xFFFFFFFFUL)) << 32) | ntohl((uint32_t)((x) >> 32)))
# define htobe64(x) ((((uint64_t)htonl((x) & 0xFFFFFFFFUL)) << 32) | htonl((uint32_t)((x) >> 32)))
# endif
# 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
#else
# error platform not supported
#endif