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/*
* Copyright 2006 Serge van den Boom <svdb@stack.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef NETPLAY
#include "checksum.h"
#include "netoptions.h"
#ifdef NETPLAY_CHECKSUM
#include "checkbuf.h"
#include "crc.h"
// for DUMP_CRC_OPS
#include "netconnection.h"
#include "netmelee.h"
#include "libs/log.h"
#include "libs/mathlib.h"
ChecksumBuffer localChecksumBuffer;
void
crc_processEXTENT(crc_State *state, const EXTENT *val) {
#ifdef DUMP_CRC_OPS
crc_log("START crc_processEXTENT().");
#endif
crc_processCOORD(state, val->width);
crc_processCOORD(state, val->height);
#ifdef DUMP_CRC_OPS
crc_log("END crc_processEXTENT().");
#endif
}
void
crc_processVELOCITY_DESC(crc_State *state, const VELOCITY_DESC *val) {
#ifdef DUMP_CRC_OPS
crc_log("START crc_processVELOCITY_DESC().");
#endif
crc_processCOUNT(state, val->TravelAngle);
crc_processEXTENT(state, &val->vector);
crc_processEXTENT(state, &val->fract);
crc_processEXTENT(state, &val->error);
crc_processEXTENT(state, &val->incr);
#ifdef DUMP_CRC_OPS
crc_log("END crc_processVELOCITY_DESC().");
#endif
}
void
crc_processPOINT(crc_State *state, const POINT *val) {
#ifdef DUMP_CRC_OPS
crc_log("START crc_processPOINT().");
#endif
crc_processCOORD(state, val->x);
crc_processCOORD(state, val->y);
#ifdef DUMP_CRC_OPS
crc_log("END crc_processPOINT().");
#endif
}
#if 0
void
crc_processSTAMP(crc_State *state, const STAMP *val) {
#ifdef DUMP_CRC_OPS
crc_log("START crc_processSTAMP().");
#endif
crc_processPOINT(state, val->origin);
crc_processFRAME(state, val->frame);
#ifdef DUMP_CRC_OPS
crc_log("END crc_processSTAMP().");
#endif
}
void
crc_processINTERSECT_CONTROL(crc_State *state, const INTERSECT_CONTROL *val) {
#ifdef DUMP_CRC_OPS
crc_log("START crc_processINTERSECT_CONTROL().");
#endif
crc_processTIME_VALUE(state, val->last_time_val);
crc_processPOINT(state, &val->EndPoint);
#ifdef DUMP_CRC_OPS
crc_log("END crc_processINTERSECT_CONTROL().");
#endif
}
#endif
void
crc_processSTATE(crc_State *state, const STATE *val) {
crc_processPOINT(state, &val->location);
}
void
crc_processELEMENT(crc_State *state, const ELEMENT *val) {
#ifdef DUMP_CRC_OPS
crc_log("START crc_processELEMENT().");
#endif
if (val->state_flags & BACKGROUND_OBJECT) {
// The element never influences the state of other elements,
// and is to be excluded from checksums.
#ifdef DUMP_CRC_OPS
crc_log(" BACKGROUND_OBJECT element omited");
#endif
} else {
crc_processELEMENT_FLAGS(state, val->state_flags);
crc_processCOUNT(state, val->life_span);
crc_processCOUNT(state, val->crew_level);
crc_processBYTE(state, val->mass_points);
crc_processBYTE(state, val->turn_wait);
crc_processBYTE(state, val->thrust_wait);
crc_processVELOCITY_DESC(state, &val->velocity);
crc_processSTATE(state, &val->current);
crc_processSTATE(state, &val->next);
}
#ifdef DUMP_CRC_OPS
crc_log("END crc_processELEMENT().");
#endif
}
void
crc_processDispQueue(crc_State *state) {
HELEMENT element;
HELEMENT nextElement;
#ifdef DUMP_CRC_OPS
size_t i = 0;
crc_log("START crc_processDispQueue().");
#endif
for (element = GetHeadElement(); element != 0; element = nextElement) {
ELEMENT *elementPtr;
#ifdef DUMP_CRC_OPS
crc_log("===== disp_q[%d]:", i);
#endif
LockElement(element, &elementPtr);
crc_processELEMENT(state, elementPtr);
nextElement = GetSuccElement(elementPtr);
UnlockElement(element);
#ifdef DUMP_CRC_OPS
i++;
#endif
}
#ifdef DUMP_CRC_OPS
crc_log("END crc_processDispQueue().");
#endif
}
void
crc_processRNG(crc_State *state) {
DWORD seed;
#ifdef DUMP_CRC_OPS
crc_log("START crc_processRNG().");
#endif
seed = TFB_SeedRandom(0);
// This modifies the seed too.
crc_processDWORD(state, seed);
TFB_SeedRandom(seed);
// Restore the old seed.
#ifdef DUMP_CRC_OPS
crc_log("END crc_processRNG().");
#endif
}
void
crc_processState(crc_State *state) {
#ifdef DUMP_CRC_OPS
crc_log("--------------------\n"
"START crc_processState() (frame %u).", battleFrameCount);
#endif
crc_processRNG(state);
crc_processDispQueue(state);
#ifdef DUMP_CRC_OPS
crc_log("END crc_processState() (frame %u).",
battleFrameCount);
#endif
}
void
initChecksumBuffers(void) {
size_t player;
for (player = 0; player < NETPLAY_NUM_PLAYERS; player++)
{
NetConnection *conn;
ChecksumBuffer *cb;
conn = netConnections[player];
if (conn == NULL)
continue;
cb = NetConnection_getChecksumBuffer(conn);
ChecksumBuffer_init(cb, getBattleInputDelay(),
NETPLAY_CHECKSUM_INTERVAL);
}
ChecksumBuffer_init(&localChecksumBuffer, getBattleInputDelay(),
NETPLAY_CHECKSUM_INTERVAL);
}
void
uninitChecksumBuffers(void)
{
size_t player;
for (player = 0; player < NETPLAY_NUM_PLAYERS; player++)
{
NetConnection *conn;
ChecksumBuffer *cb;
conn = netConnections[player];
if (conn == NULL)
continue;
cb = NetConnection_getChecksumBuffer(conn);
ChecksumBuffer_uninit(cb);
}
ChecksumBuffer_uninit(&localChecksumBuffer);
}
void
addLocalChecksum(BattleFrameCounter frameNr, Checksum checksum) {
assert(frameNr == battleFrameCount);
ChecksumBuffer_addChecksum(&localChecksumBuffer, frameNr, checksum);
}
void
addRemoteChecksum(NetConnection *conn, BattleFrameCounter frameNr,
Checksum checksum) {
ChecksumBuffer *cb;
assert(frameNr <= battleFrameCount + getBattleInputDelay() + 1);
assert(frameNr + getBattleInputDelay() >= battleFrameCount);
cb = NetConnection_getChecksumBuffer(conn);
ChecksumBuffer_addChecksum(cb, frameNr, checksum);
}
bool
verifyChecksums(BattleFrameCounter frameNr) {
Checksum localChecksum;
size_t player;
if (!ChecksumBuffer_getChecksum(&localChecksumBuffer, frameNr,
&localChecksum)) {
// Right now, we require that a checksum is present.
// If/when we move to UDP, and packets may get lost, we may prefer
// not to do any checks in this case.
return false;
}
for (player = 0; player < NETPLAY_NUM_PLAYERS; player++)
{
NetConnection *conn;
ChecksumBuffer *cb;
Checksum remoteChecksum;
conn = netConnections[player];
if (conn == NULL)
continue;
cb = NetConnection_getChecksumBuffer(conn);
if (!ChecksumBuffer_getChecksum(cb, frameNr, &remoteChecksum))
return false;
if (localChecksum != remoteChecksum) {
log_add(log_Error, "Network connections have gone out of "
"sync.\n");
return false;
}
}
return true;
}
#endif /* NETPLAY_CHECKSUM */
#endif /* NETPLAY */
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