#include?“common.h“

unsigned?short?ip_checksum（unsigned?short?*pcheck?int?check_len）
{
	int?nleft?=?check_len;

	int?sum?=?0;

	unsigned?short?*p=pcheck;

	unsigned?short?result?=?0;

	while（nleft?>1）
	{
		sum?+=?*p++;
		nleft-=sizeof（unsigned?short）;
	}
	if（nleft?==?1）
	{
		*（unsigned?char?*）（&result）=*（unsigned?char?*）p;
		sum?+=?result;
	}

	sum=（sum>>16）+（sum?&0xffff）;

	sum+=（sum>>16）;

	result?=?~sum;
	
	return?result;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????????422??2012-07-13?15:37??myping\Makefile
?????文件?????????433??2012-07-14?00:28??myping\check_sum.c
?????文件?????????540??2012-07-14?00:19??myping\common.h
?????文件?????????285??2012-07-13?15:40??myping\main.c
?????文件?????????927??2012-07-14?09:23??myping\ping.c
?????文件????????1287??2012-07-14?09:25??myping\receive.c
?????文件?????????681??2012-07-14?09:24??myping\send.c
?????目錄???????????0??2018-12-26?02:09??myping\