Rob Greenhill / EthernetNetIf

LPC1768/lwip/include/ipv4/lwip/inet_chksum.h@0:f993b6d8b1d8, 2012-05-29 (annotated)

Committer:
zoot661
Date:
Tue May 29 09:49:18 2012 +0000
Revision:
0:f993b6d8b1d8

        

        
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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: Adam Dunkels <adam@sics.se>





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 *





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 */





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#ifndef __LWIP_INET_CHKSUM_H__





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#define __LWIP_INET_CHKSUM_H__





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#include "lwip/opt.h"





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#include "lwip/pbuf.h"





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#include "lwip/ip_addr.h"





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/** Swap the bytes in an u16_t: much like htons() for little-endian */





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#ifndef SWAP_BYTES_IN_WORD





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#if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)





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/* little endian and PLATFORM_BYTESWAP defined */





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#define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w)





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#else /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) */





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/* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */





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#define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)





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





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#endif /* SWAP_BYTES_IN_WORD */





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/** Split an u32_t in two u16_ts and add them up */





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#ifndef FOLD_U32T





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#define FOLD_U32T(u)          (((u) >> 16) + ((u) & 0x0000ffffUL))





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#endif





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#if LWIP_CHECKSUM_ON_COPY





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/** Function-like macro: same as MEMCPY but returns the checksum of copied data





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    as u16_t */





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#ifndef LWIP_CHKSUM_COPY





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#define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)





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#ifndef LWIP_CHKSUM_COPY_ALGORITHM





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#define LWIP_CHKSUM_COPY_ALGORITHM 1





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#endif /* LWIP_CHKSUM_COPY_ALGORITHM */





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#endif /* LWIP_CHKSUM_COPY */





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#else /* LWIP_CHECKSUM_ON_COPY */





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#define LWIP_CHKSUM_COPY_ALGORITHM 0





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#endif /* LWIP_CHECKSUM_ON_COPY */





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#ifdef __cplusplus





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extern "C" {





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#endif





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u16_t inet_chksum(void *dataptr, u16_t len);





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u16_t inet_chksum_pbuf(struct pbuf *p);





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u16_t inet_chksum_pseudo(struct pbuf *p,





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       ip_addr_t *src, ip_addr_t *dest,





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       u8_t proto, u16_t proto_len);





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u16_t inet_chksum_pseudo_partial(struct pbuf *p,





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       ip_addr_t *src, ip_addr_t *dest,





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       u8_t proto, u16_t proto_len, u16_t chksum_len);





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#if LWIP_CHKSUM_COPY_ALGORITHM





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u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);





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#endif /* LWIP_CHKSUM_COPY_ALGORITHM */





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#ifdef __cplusplus





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}





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#endif





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#endif /* __LWIP_INET_H__ */





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