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  1. /*
  2.  * Copyright (c) 2009 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup net
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Host - network byte order manipulation functions.
  35.  */
  36.  
  37. #ifndef __NET_BYTEORDER_H__
  38. #define __NET_BYTEORDER_H__
  39.  
  40. #include <byteorder.h>
  41.  
  42. #include <sys/types.h>
  43.  
  44. #ifdef ARCH_IS_BIG_ENDIAN
  45.  
  46. // Already in the network byte order.
  47.  
  48.     /** Converts the given short number ( 16 bit ) from the host byte order to the network byte order ( big endian ).
  49.      *  @param[in] number The number in the host byte order to be converted.
  50.      *  @returns The number in the network byte order.
  51.      */
  52.     #define htons( number )     ( number )
  53.  
  54.     /** Converts the given long number ( 32 bit ) from the host byte order to the network byte order ( big endian ).
  55.      *  @param[in] number The number in the host byte order to be converted.
  56.      *  @returns The number in the network byte order.
  57.      */
  58.     #define htonl( number )     ( number )
  59.  
  60.     /** Converts the given short number ( 16 bit ) from the network byte order ( big endian ) to the host byte order.
  61.      *  @param[in] number The number in the network byte order to be converted.
  62.      *  @returns The number in the host byte order.
  63.      */
  64.     #define ntohs( number )     ( number )
  65.  
  66.     /** Converts the given long number ( 32 bit ) from the network byte order ( big endian ) to the host byte order.
  67.      *  @param[in] number The number in the network byte order to be converted.
  68.      *  @returns The number in the host byte order.
  69.      */
  70.     #define ntohl( number )     ( number )
  71.  
  72. #else
  73.  
  74. // Has to be swapped.
  75.  
  76.     /** Converts the given short number ( 16 bit ) from the host byte order to the network byte order ( big endian ).
  77.      *  @param[in] number The number in the host byte order to be converted.
  78.      *  @returns The number in the network byte order.
  79.      */
  80.     #define htons( number )     uint16_t_byteorder_swap(( uint16_t )( number ))
  81.  
  82.     /** Converts the given long number ( 32 bit ) from the host byte order to the network byte order ( big endian ).
  83.      *  @param[in] number The number in the host byte order to be converted.
  84.      *  @returns The number in the network byte order.
  85.      */
  86.     #define htonl( number )     uint32_t_byteorder_swap( number )
  87.  
  88.     /** Converts the given short number ( 16 bit ) from the network byte order ( big endian ) to the host byte order.
  89.      *  @param[in] number The number in the network byte order to be converted.
  90.      *  @returns The number in the host byte order.
  91.      */
  92.     #define ntohs( number )     uint16_t_byteorder_swap(( uint16_t )( number ))
  93.  
  94.     /** Converts the given long number ( 32 bit ) from the network byte order ( big endian ) to the host byte order.
  95.      *  @param[in] number The number in the network byte order to be converted.
  96.      *  @returns The number in the host byte order.
  97.      */
  98.     #define ntohl( number )     uint32_t_byteorder_swap( number )
  99.  
  100. #endif
  101.  
  102. #endif
  103.  
  104. /** @}
  105.  */
  106.