endian.h
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   endian.h - integer byte order declarations and definitions;
     *
     *   this header is included to support recent moves to expand and
     *   standardize endian conversion functions on Linux, FreeBSD and
     *   NetBSD; Linux has implemented the following functions but OSX
     *   and Microsoft have not yet done so;
     *
     *   These functions are similar to network byteorder functions.
     *   For example, be32toh() is identical to ntohl().
     *
     *   #define _BSD_SOURCE
     *   #include <endian.h>
     *
     *   uint16_t htobe16(uint16_t x);
     *   uint16_t htole16(uint16_t x);
     *   uint16_t be16toh(uint16_t x);
     *   uint16_t le16toh(uint16_t x);
     *
     *   uint32_t htobe32(uint32_t x);
     *   uint32_t htole32(uint32_t x);
     *   uint32_t be32toh(uint32_t x);
     *   uint32_t le32toh(uint32_t x);
     *
     *   uint64_t htobe64(uint64_t x);
     *   uint64_t htole64(uint64_t x);
     *   uint64_t be64toh(uint64_t x);
     *   uint64_t le64toh(uint64_t x);
     *
     *   The advantage of network byteorder functions is that they are
     *   available on all Unix systems but they were meant for network
     *   applications and lack little-endian and 64-bit variants;
     *
     *   Motley Tools by Charles Maier <cmaier@cmassoc.net>;
     *   Copyright 2001-2006 by Charles Maier Associates;
     *   Licensed under the Internet Software Consortium License;
     *
     *--------------------------------------------------------------------*/

    #ifndef ENDIAN_HEADER
    #define ENDIAN_HEADER

    /*====================================================================*
     *   system header files;
     *--------------------------------------------------------------------*/

    #include <unistd.h>

    #if defined (__linux__)
    #       include <endian.h>
    #       include <byteswap.h>
    #elif defined (__APPLE__)
    #       include <netinet/in.h>
    #       include <libkern/OSByteOrder.h>
    #elif defined (__OpenBSD__)
    #       include <sys/types.h>
    #elif defined (WIN32)
    #       include <stdint.h>
    #       define BYTE_ORDER LITTLE_ENDIAN
    #elif defined (__vxworks)
    #       include <netinet/in.h>
    #elif defined (__CYGWIN__)
    #	error "Cygwin is unsupported"
    #else
    #	error "Unknown environment"
    #endif

    /*====================================================================*
     *   definitions;
     *--------------------------------------------------------------------*/

    #if defined (BYTE_ORDER)
    #       if BYTE_ORDER == LITTLE_ENDIAN
    #               define BE16TOH(x) __bswap_16(x)
    #               define BE32TOH(x) __bswap_32(x)
    #               define BE64TOH(x) __bswap_64(x)
    #               define HTOBE16(x) __bswap_16(x)
    #               define HTOBE32(x) __bswap_32(x)
    #               define HTOBE64(x) __bswap_64(x)
    #               define LE16TOH(x) (x)
    #               define LE32TOH(x) (x)
    #               define LE64TOH(x) (x)
    #               define HTOLE16(x) (x)
    #               define HTOLE32(x) (x)
    #               define HTOLE64(x) (x)
    #       elif BYTE_ORDER == BIG_ENDIAN
    #               define BE16TOH(x) (x)
    #               define BE32TOH(x) (x)
    #               define BE64TOH(x) (x)
    #               define HTOBE16(x) (x)
    #               define HTOBE32(x) (x)
    #               define HTOBE64(x) (x)
    #               define LE16TOH(x) __bswap_16(x)
    #               define LE32TOH(x) __bswap_32(x)
    #               define LE64TOH(x) __bswap_64(x)
    #               define HTOLE16(x) __bswap_16(x)
    #               define HTOLE32(x) __bswap_32(x)
    #               define HTOLE64(x) __bswap_64(x)
    #       else
    #               error "Undefined host byte order (2)."
    #       endif
    #elif defined (__vxworks) && defined (_BYTE_ORDER)
    #       if _BYTE_ORDER == _LITTLE_ENDIAN
    #               define BE16TOH(x) __bswap_16(x)
    #               define BE32TOH(x) __bswap_32(x)
    #               define BE64TOH(x) __bswap_64(x)
    #               define HTOBE16(x) __bswap_16(x)
    #               define HTOBE32(x) __bswap_32(x)
    #               define HTOBE64(x) __bswap_64(x)
    #               define LE16TOH(x) (x)
    #               define LE32TOH(x) (x)
    #               define LE64TOH(x) (x)
    #               define HTOLE16(x) (x)
    #               define HTOLE32(x) (x)
    #               define HTOLE64(x) (x)
    #       elif _BYTE_ORDER == _BIG_ENDIAN
    #               define __bswap_32(x)    ((((x) & 0x000000ff) << 24) | (((x) & 0x0000ff00) <<  8) | (((x) & 0x00ff0000) >>  8) | (((x) & 0xff000000) >> 24))
    #               define __bswap_16(x)    ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8))
    #               define BE16TOH(x) (x)
    #               define BE32TOH(x) (x)
    #               define BE64TOH(x) (x)
    #               define HTOBE16(x) (x)
    #               define HTOBE32(x) (x)
    #               define HTOBE64(x) (x)
    #               define LE16TOH(x) __bswap_16(x)
    #               define LE32TOH(x) __bswap_32(x)
    #               define LE64TOH(x) __bswap_64(x)
    #               define HTOLE16(x) __bswap_16(x)
    #               define HTOLE32(x) __bswap_32(x)
    #               define HTOLE64(x) __bswap_64(x)
    #       else
    #               error "Undefined host byte order vxworks."
    #       endif
    #else
    #error "Undefined host byte order (1)."
    #endif

    /*====================================================================*
     *   endian conversion functions;
     *--------------------------------------------------------------------*/

    #if defined (WIN32)

    uint16_t __bswap_16 (uint16_t x);
    uint32_t __bswap_32 (uint32_t x);
    uint64_t __bswap_64 (uint64_t x);

    #elif defined (__OpenBSD__)

    #define __bswap_16(x) swap16(x)
    #define __bswap_32(x) swap32(x)
    #define __bswap_64(x) swap64(x)

    #elif defined (__APPLE__)

    #define __bswap_16(x) OSSwapInt16(x)
    #define __bswap_32(x) OSSwapInt32(x)
    #define __bswap_64(x) OSSwapInt64(x)

    #elif defined (__linux__)

    #else
    #error "Unknown Environment"
    #endif

    /*====================================================================*
     *
     *--------------------------------------------------------------------*/

    #endif

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