mirror of
https://github.com/ep00ch/lwip-contrib-mac.git
synced 2024-08-28 18:29:08 +00:00
74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/*
|
|
* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without modification,
|
|
* are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
|
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
|
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
|
* OF SUCH DAMAGE.
|
|
*
|
|
* This file is part of the lwIP TCP/IP stack.
|
|
*
|
|
* Author: Adam Dunkels <adam@sics.se>
|
|
*
|
|
*/
|
|
|
|
#include "lwip/debug.h"
|
|
|
|
#include "lwip/arch.h"
|
|
|
|
#include "lwip/def.h"
|
|
#include "lwip/inet.h"
|
|
|
|
|
|
/*-----------------------------------------------------------------------------------*/
|
|
/* lwip_chksum:
|
|
*
|
|
* Sums up all 16 bit words in a memory portion. Also includes any odd byte.
|
|
* This function is used by the other checksum functions.
|
|
*
|
|
*/
|
|
/*-----------------------------------------------------------------------------------*/
|
|
#if 0
|
|
u16_t
|
|
lwip_chksum(void *dataptr, int len)
|
|
{
|
|
u32_t acc;
|
|
|
|
for(acc = 0; len > 1; len -= 2) {
|
|
acc += *((u16_t *)dataptr)++;
|
|
}
|
|
|
|
/* add up any odd byte */
|
|
if (len == 1) {
|
|
acc += htons((u16_t)((*(u8_t *)dataptr) & 0xff) << 8);
|
|
LWIP_DEBUGF(INET_DEBUG, ("inet: chksum: odd byte %d\n", *(u8_t *)dataptr));
|
|
}
|
|
acc = (acc >> 16) + (acc & 0xffffUL);
|
|
|
|
if (acc & 0xffff0000 != 0) {
|
|
acc = (acc >> 16) + (acc & 0xffffUL);
|
|
}
|
|
|
|
return (u16_t)acc;
|
|
}
|
|
/*-----------------------------------------------------------------------------------*/
|
|
#endif
|