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portable_endian.h
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// taken from
// https://raw.githubusercontent.com/pyca/bcrypt/master/src/_csrc/portable_endian.h
// as of June 11, 2020
// "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.
#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(htobe64) && defined(be64toh) && defined(htole64) && defined(le64toh)
/* 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)
# define htobe16(x) htons(x)
# define htole16(x) (x)
# define be16toh(x) ntohs(x)
# define le16toh(x) (x)
# define htobe32(x) htonl(x)
# define htole32(x) (x)
# define be32toh(x) ntohl(x)
# define le32toh(x) (x)
# define htobe64(x) (((uint64_t)htonl(((uint32_t)(((uint64_t)(x)) >> 32)))) | (((uint64_t)htonl(((uint32_t)(x)))) << 32))
# define htole64(x) (x)
# define be64toh(x) (((uint64_t)ntohl(((uint32_t)(((uint64_t)(x)) >> 32)))) | (((uint64_t)ntohl(((uint32_t)(x)))) << 32))
# define le64toh(x) (x)
# 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__)
# ifdef __MINGW32__
# include <stdlib.h>
# endif
# 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