64位网络字节序与主机字节序转换

unsigned long long ntohll(unsigned long long val)
{
if (__BYTE_ORDER == __LITTLE_ENDIAN)
{
return (((unsigned long long )htonl((int)((val << 32) >> 32))) << 32) | (unsigned int)htonl((int)(val >> 32));
}
else if (__BYTE_ORDER == __BIG_ENDIAN)
{
return val;
}
}