Daniel Peter / Net

lwip/core/def.c@0:d616ece2d859, 2010-09-18 (annotated)

Committer:
mbed714
Date:
Sat Sep 18 23:05:49 2010 +0000
Revision:
0:d616ece2d859

        

        
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/**





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 * @file





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 * Common functions used throughout the stack.





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 *





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 */





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/*





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 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.





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 * All rights reserved.





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 *





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 * Redistribution and use in source and binary forms, with or without modification,





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 * are permitted provided that the following conditions are met:





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 *





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 * 1. Redistributions of source code must retain the above copyright notice,





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 *    this list of conditions and the following disclaimer.





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 * 2. Redistributions in binary form must reproduce the above copyright notice,





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 *    this list of conditions and the following disclaimer in the documentation





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 *    and/or other materials provided with the distribution.





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 * 3. The name of the author may not be used to endorse or promote products





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 *    derived from this software without specific prior written permission.





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 *





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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED





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 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF





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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT





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 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,





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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT





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 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS





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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN





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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING





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 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY





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 * OF SUCH DAMAGE.





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 *





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 * This file is part of the lwIP TCP/IP stack.





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 *





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 * Author: Simon Goldschmidt





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 *





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 */





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#include "lwip/opt.h"





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#include "lwip/def.h"





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/**





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 * These are reference implementations of the byte swapping functions.





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 * Again with the aim of being simple, correct and fully portable.





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 * Byte swapping is the second thing you would want to optimize. You will





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 * need to port it to your architecture and in your cc.h:





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 * 





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 * #define LWIP_PLATFORM_BYTESWAP 1





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 * #define LWIP_PLATFORM_HTONS(x) <your_htons>





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 * #define LWIP_PLATFORM_HTONL(x) <your_htonl>





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 *





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 * Note ntohs() and ntohl() are merely references to the htonx counterparts.





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 */





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#if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)





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/**





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 * Convert an u16_t from host- to network byte order.





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 *





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 * @param n u16_t in host byte order





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 * @return n in network byte order





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 */





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u16_t





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lwip_htons(u16_t n)





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{





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  return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);





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}





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/**





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 * Convert an u16_t from network- to host byte order.





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 *





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 * @param n u16_t in network byte order





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 * @return n in host byte order





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 */





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u16_t





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lwip_ntohs(u16_t n)





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{





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  return lwip_htons(n);





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}





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/**





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 * Convert an u32_t from host- to network byte order.





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 *





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 * @param n u32_t in host byte order





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 * @return n in network byte order





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 */





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u32_t





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lwip_htonl(u32_t n)





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{





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  return ((n & 0xff) << 24) |





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    ((n & 0xff00) << 8) |





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    ((n & 0xff0000UL) >> 8) |





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    ((n & 0xff000000UL) >> 24);





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}





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/**





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 * Convert an u32_t from network- to host byte order.





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 *





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 * @param n u32_t in network byte order





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 * @return n in host byte order





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 */





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u32_t





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lwip_ntohl(u32_t n)





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{





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  return lwip_htonl(n);





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}





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#endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */