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CRC validity checking. Ignore CRCs if they don't work.

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This commit is contained in:
Gregor Richards 2016-12-15 12:43:29 -05:00
parent a6cd8c3aa1
commit 6658826759
3 changed files with 19 additions and 8 deletions
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2
network/netplay/netplay_init.c
View File

@ -429,6 +429,8 @@ netplay_t *netplay_new(void *direct_host, const char *server, uint16_t port,
netplay->nat_traversal = netplay->is_server ? nat_traversal : false;
netplay->delay_frames = delay_frames;
netplay->check_frames = check_frames;
netplay->crc_validity_checked = false;
netplay->crcs_valid = true;
netplay->quirks = quirks;
netplay->self_mode = netplay->is_server ?
NETPLAY_CONNECTION_PLAYING :

6
network/netplay/netplay_private.h
View File

@ -430,6 +430,12 @@ struct netplay
/* Frequency with which to check CRCs */
uint32_t check_frames;
/* Have we checked whether CRCs are valid at all? */
bool crc_validity_checked;
/* Are they valid? */
bool crcs_valid;
};

19
network/netplay/netplay_sync.c
View File

@ -131,34 +131,37 @@ void netplay_simulate_input(netplay_t *netplay, size_t sim_ptr, bool resim)
static void netplay_handle_frame_hash(netplay_t *netplay, struct delta_frame *delta)
{
static bool crcs_valid = true;
if (netplay->is_server)
{
if (netplay->check_frames &&
(delta->frame % netplay->check_frames == 0 || delta->frame == 1))
delta->frame % netplay->check_frames == 0)
{
delta->crc = netplay_delta_frame_crc(netplay, delta);
netplay_cmd_crc(netplay, delta);
}
}
else if (delta->crc && crcs_valid)
else if (delta->crc && netplay->crcs_valid)
{
/* We have a remote CRC, so check it */
uint32_t local_crc = netplay_delta_frame_crc(netplay, delta);
if (local_crc != delta->crc)
{
if (delta->frame == 1)
if (!netplay->crc_validity_checked)
{
/* We check frame 1 just to make sure the CRCs make sense at all.
* If we've diverged at frame 1, we assume CRCs are not useful. */
crcs_valid = false;
/* If the very first check frame is wrong, they probably just don't
* work */
netplay->crcs_valid = false;
}
else if (crcs_valid)
else if (netplay->crcs_valid)
{
/* Fix this! */
netplay_cmd_request_savestate(netplay);
}
}
else if (!netplay->crc_validity_checked)
{
netplay->crc_validity_checked = true;
}
}
}