[PATCH 2/7] dpwsockx: Implementation of SPInit

[Ismael Barros²]

On Tue, Sep 1, 2009 at 12:43 PM, Henri Verbeet<hverbeet at gmail.com> wrote:
> 2009/9/1 Ismael Barros² <razielmine at gmail.com>:
>> Is there any standard way to deal with this cases? Any example in the codebase?
>>
> For packing, look for "#include <pshpack1.h>" and "#include
> <poppack.h>" in some of the headers. For byte ordering look at how
> htonl etc. are defined in include/winsock.h, but you'll want the
> opposite since the data uses x86 byte ordering.
>

I've been looking into iphlpapi/ip.h (just learned bit fields
exist...); would this implementation be fine?

#include "pshpack1.h"

typedef struct tagDPSP_MSG_HEADER
{
#ifdef WORDS_BIGENDIAN
    DWORD size:20;
    DWORD token:12;
#else
    DWORD token:12;
    DWORD size:20;
#endif
    SOCKADDR_IN SockAddr;
} DPSP_MSG_HEADER, *LPDPSP_MSG_HEADER;
typedef const DPSP_MSG_HEADER* LPCDPSP_MSG_HEADER;

/* DPSP_MSG_HEADER->token */
#define DPSP_MSG_TOKEN_REMOTE    0xFAB
#define DPSP_MSG_TOKEN_FORWARDED 0xCAB
#define DPSP_MSG_TOKEN_SERVER    0xBAB

#include "poppack.h"