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Add functions NETsendGAMESTRUCT and NETrecvGAMESTRUCT to deal with sending & receiving of GAMESTRUCTs in an endian safe way 

git-svn-id: svn+ssh://svn.gna.org/svn/warzone/trunk@3664 4a71c877-e1ca-e34f-864e-861f7616d084
master
Giel van Schijndel 2008-02-03 16:39:46 +00:00
parent fb83d6fc8a
commit 730ef63107
1 changed files with 88 additions and 0 deletions
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88
lib/netplay/netplay.c
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@ -414,6 +414,94 @@ BOOL NETsetGameFlags(UDWORD flag, SDWORD value)
return TRUE;
}
static void NETsendGAMESTRUCT(TCPsocket socket, const GAMESTRUCT* game)
{
// A buffer that's guaranteed to have the correct size (i.e. it
// circumvents struct padding, which could pose a problem).
char buf[sizeof(game->name) + sizeof(game->desc.host) + sizeof(int32_t) * 8];
char* buffer = buf;;
// Now dump the data into the buffer
// Copy a string
strlcpy(buffer, game->name, sizeof(game->name));
buffer += sizeof(game->name);
// Copy 32bit large big endian numbers
*(int32_t*)buffer = SDL_SwapBE32(game->desc.dwSize);
buffer += sizeof(int32_t);
*(int32_t*)buffer = SDL_SwapBE32(game->desc.dwFlags);
buffer += sizeof(int32_t);
// Copy yet another string
strlcpy(buffer, game->desc.host, sizeof(game->desc.host));
buffer += sizeof(game->desc.host);
// Copy 32bit large big endian numbers
*(int32_t*)buffer = SDL_SwapBE32(game->desc.dwMaxPlayers);
buffer += sizeof(int32_t);
*(int32_t*)buffer = SDL_SwapBE32(game->desc.dwCurrentPlayers);
buffer += sizeof(int32_t);
*(int32_t*)buffer = SDL_SwapBE32(game->desc.dwUser1);
buffer += sizeof(int32_t);
*(int32_t*)buffer = SDL_SwapBE32(game->desc.dwUser2);
buffer += sizeof(int32_t);
*(int32_t*)buffer = SDL_SwapBE32(game->desc.dwUser3);
buffer += sizeof(int32_t);
*(int32_t*)buffer = SDL_SwapBE32(game->desc.dwUser4);
buffer += sizeof(int32_t);
// Send over the GAMESTRUCT
SDLNet_TCP_Send(socket, buf, sizeof(buf));
}
static bool NETrecvGAMESTRUCT(GAMESTRUCT* game)
{
// A buffer that's guaranteed to have the correct size (i.e. it
// circumvents struct padding, which could pose a problem).
char buf[sizeof(game->name) + sizeof(game->desc.host) + sizeof(int32_t) * 8];
char* buffer = buf;
// Read a GAMESTRUCT from the connection
if (tcp_socket == NULL
|| socket_set == NULL
|| SDLNet_CheckSockets(socket_set, 1000) <= 0
|| !SDLNet_SocketReady(tcp_socket)
|| SDLNet_TCP_Recv(tcp_socket, buf, sizeof(buf)) != sizeof(buf))
{
return false;
}
// Now dump the data into the game struct
// Copy a string
strlcpy(game->name, buffer, sizeof(game->name));
buffer += sizeof(game->name);
// Copy 32bit large big endian numbers
game->desc.dwSize = SDL_SwapBE32(*(int32_t*)buffer);
buffer += sizeof(int32_t);
game->desc.dwFlags = SDL_SwapBE32(*(int32_t*)buffer);
buffer += sizeof(int32_t);
// Copy yet another string
strlcpy(game->desc.host, buffer, sizeof(game->desc.host));
buffer += sizeof(game->desc.host);
// Copy 32bit large big endian numbers
game->desc.dwMaxPlayers = SDL_SwapBE32(*(int32_t*)buffer);
buffer += sizeof(int32_t);
game->desc.dwCurrentPlayers = SDL_SwapBE32(*(int32_t*)buffer);
buffer += sizeof(int32_t);
game->desc.dwUser1 = SDL_SwapBE32(*(int32_t*)buffer);
buffer += sizeof(int32_t);
game->desc.dwUser2 = SDL_SwapBE32(*(int32_t*)buffer);
buffer += sizeof(int32_t);
game->desc.dwUser3 = SDL_SwapBE32(*(int32_t*)buffer);
buffer += sizeof(int32_t);
game->desc.dwUser4 = SDL_SwapBE32(*(int32_t*)buffer);
buffer += sizeof(int32_t);
return true;
}
// ////////////////////////////////////////////////////////////////////////
// setup stuff