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74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/*
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* Copyright (c) 2001-2003 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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#include "lwip/debug.h"
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#include "lwip/arch.h"
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#include "lwip/def.h"
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#include "lwip/inet.h"
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/*-----------------------------------------------------------------------------------*/
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/* lwip_chksum:
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*
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* Sums up all 16 bit words in a memory portion. Also includes any odd byte.
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* This function is used by the other checksum functions.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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#if 0
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u16_t
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lwip_chksum(void *dataptr, int len)
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{
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u32_t acc;
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for(acc = 0; len > 1; len -= 2) {
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acc += *((u16_t *)dataptr)++;
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}
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/* add up any odd byte */
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if(len == 1) {
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acc += htons((u16_t)((*(u8_t *)dataptr) & 0xff) << 8);
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DEBUGF(INET_DEBUG, ("inet: chksum: odd byte %d\n", *(u8_t *)dataptr));
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}
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acc = (acc >> 16) + (acc & 0xffffUL);
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if(acc & 0xffff0000 != 0) {
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acc = (acc >> 16) + (acc & 0xffffUL);
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}
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return (u16_t)acc;
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}
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/*-----------------------------------------------------------------------------------*/
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#endif
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