endianess.h

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#ifndef __ENDIANESS_HANDLER__
 
/* The following is based on xorg/xserver/GL/glx/glxbyteorder.h
 * which is (c) IBM Corp. 2006,2007 and originally licensed under the following
 * BSD-license. All modifications in navit are licensed under the GNU GPL as
 * described in file "COPYRIGHT".
 *
 * Portions also from GNU C Library include/bits/byteswap.h Also licsend
 * under the GPL.
 *
 * --------------------------
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sub license,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, THE AUTHORS, AND/OR THEIR SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#    if HAVE_BYTESWAP_H
/* machine dependent versions of byte swapping functions.  GNU extension.*/
#        include <byteswap.h>
#        if HAVE_ENDIAN_H
#            include <endian.h>
#        endif
#    elif defined(USE_SYS_ENDIAN_H)
#        include <sys/endian.h>
#        if defined(_BYTE_ORDER) && !defined(__BYTE_ORDER)
#            define __BYTE_ORDER _BYTE_ORDER
#            define __LITTLE_ENDIAN _LITTLE_ENDIAN
#            define __BIG_ENDIAN _BIG_ENDIAN
#        endif
#    elif defined(__APPLE__)
#        include <libkern/OSByteOrder.h>
#        define __bswap_16 OSSwapInt16
#        define __bswap_32 OSSwapInt32
#        define __bswap_64 OSSwapInt64
 
#        ifndef __BYTE_ORDER
#            define __LITTLE_ENDIAN 1234
#            define __BIG_ENDIAN 4321
 
#            if defined(__LITTLE_ENDIAN__)
#                define __BYTE_ORDER __LITTLE_ENDIAN
#            elif defined(__BIG_ENDIAN__)
#                define __BYTE_ORDER __BIG_ENDIAN
#            else
#                error "No endianness defined for Mac OS!"
#            endif
#        endif
 
#    elif defined(_WIN32) || defined(__CEGCC__)
#        define __BIG_ENDIAN 4321
#        define __LITTLE_ENDIAN 1234
#        define __BYTE_ORDER __LITTLE_ENDIAN
#    else
#        define __bswap_16(__bsx) ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8))
#        define __bswap_32(__bsx)                                                                                      \
            ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | (((__bsx) & 0x0000ff00) << 8)            \
             | (((__bsx) & 0x000000ff) << 24))
 
#    endif
 
#    if __BYTE_ORDER == __BIG_ENDIAN
#        define le16_to_cpu(x) __bswap_16(x)
#        define le32_to_cpu(x) __bswap_32(x)
#        define le64_to_cpu(x) __bswap_64(x)
#        define cpu_to_le16(x) __bswap_16(x)
#        define cpu_to_le32(x) __bswap_32(x)
#        define cpu_to_le64(x) __bswap_64(x)
#    elif __BYTE_ORDER == __LITTLE_ENDIAN
#        define le16_to_cpu(x) (x)
#        define le32_to_cpu(x) (x)
#        define cpu_to_le16(x) (x)
#        define cpu_to_le32(x) (x)
#    else
#        error "Unknown endianess"
#    endif
 
#    define __ENDIANESS_HANDLER__
#endif