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#include "crtl/easy/attribute.h"#include "crtl/tcp-ip/crtl_tcp_ip_checksum.h"/* get checksum value */inline unsigned short crtl_tcp_ip_chksum1(void *pkg, int size){    int             nleft   = size;    int             sum     = 0;    unsigned short  *w      = pkg;    unsigned short  answer  = 0;    while (nleft > 1)    {        sum += *w++;        nleft -= 2;    }    if (nleft == 1)    {        * (unsigned char *) (&answer) = *(unsigned char *)w;        sum += answer;    }    sum     = (sum >> 16) + (sum & 0xffff);    sum     += (sum >> 16);    answer  = ~sum;        return answer;}

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