PortableEndian.hpp

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// "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.

// Updated for FreeBSD 10.1+, DragonFly 4.2+, NetBSD 6.1.5+, fixes for Win32,
// and support for emscripten; Christian Berger.

#ifndef CLUON_PORTABLEENDIAN_HPP
#define CLUON_PORTABLEENDIAN_HPP

// clang-format off
#if defined(__linux__) || defined(__CYGWIN__)
    #include <endian.h>
#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)
#elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
    #include <sys/endian.h>
#elif (defined(_WIN16) || defined(_WIN32) || defined(_WIN64))
    #if BYTE_ORDER == LITTLE_ENDIAN
        // Add missing definitions for MinGW.
        #ifndef htonll
            #define htonll(x) ((1==htonl(1)) ? (x) : (((uint64_t)htonl((x) & 0xFFFFFFFFUL)) << 32) | htonl((uint32_t)((x) >> 32)))
        #endif
        #ifndef ntohll
            #define ntohll(x) ((1==ntohl(1)) ? (x) : (((uint64_t)ntohl((x) & 0xFFFFFFFFUL)) << 32) | ntohl((uint32_t)((x) >> 32)))
        #endif

        #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) htonll(x)
        #define htole64(x) (x)
        #define be64toh(x) ntohll(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
#else
    #ifdef __EMSCRIPTEN__
        #include <endian.h>
    #else
        #warning platform not supported
    #endif
#endif
// clang-format on
#endif