//credits to iceman
uint32_t CRC8Maxim(uint8_t *buff, size_t size) {
crc_t crc;
crc_init(&crc, 9, 0x8c, 0x00, 0x00);
crc_clear(&crc);
for (size_t i=0; i < size; ++i)
crc_update(&crc, buff[i], 8);
return crc_finish(&crc);
}
//credits to iceman
uint32_t CRC8Legic(uint8_t *buff, size_t size) {
// Poly 0x63, reversed poly 0xC6, Init 0x55, Final 0x00
crc_t crc;
crc_init(&crc, 8, 0xC6, 0x55, 0);
crc_clear(&crc);
for ( int i = 0; i < size; ++i)
crc_update(&crc, buff[i], 8);
return SwapBits(crc_finish(&crc), 8);
}
static BOOLEAN
DoBattle (BATTLE_STATE *bs)
{
extern UWORD nth_frame;
RECT r;
BYTE battle_speed;
SetMenuSounds (MENU_SOUND_NONE, MENU_SOUND_NONE);
#if defined (NETPLAY) && defined (NETPLAY_CHECKSUM)
if (getNumNetConnections() > 0 &&
battleFrameCount % NETPLAY_CHECKSUM_INTERVAL == 0)
{
crc_State state;
Checksum checksum;
crc_init(&state);
crc_processState (&state);
checksum = (Checksum) crc_finish (&state);
Netplay_NotifyAll_checksum ((uint32) battleFrameCount,
(uint32) checksum);
flushPacketQueues ();
addLocalChecksum (battleFrameCount, checksum);
}
#endif
ProcessInput ();
// Also calls NetInput()
#if defined (NETPLAY) && defined (NETPLAY_CHECKSUM)
if (getNumNetConnections() > 0)
{
size_t delay = getBattleInputDelay();
if (battleFrameCount >= delay
&& (battleFrameCount - delay) % NETPLAY_CHECKSUM_INTERVAL == 0)
{
if (!(GLOBAL (CurrentActivity) & CHECK_ABORT))
{
if (!verifyChecksums (battleFrameCount - delay)) {
GLOBAL(CurrentActivity) |= CHECK_ABORT;
resetConnections (ResetReason_syncLoss);
}
}
}
}
#endif
LockMutex (GraphicsLock);
if (bs->first_time)
{
r.corner.x = SIS_ORG_X;
r.corner.y = SIS_ORG_Y;
r.extent.width = SIS_SCREEN_WIDTH;
r.extent.height = SIS_SCREEN_HEIGHT;
SetTransitionSource (&r);
}
BatchGraphics ();
// Call the callback function, if set
if (bs->frame_cb)
bs->frame_cb ();
RedrawQueue (TRUE);
if (bs->first_time)
{
bs->first_time = FALSE;
ScreenTransition (3, &r);
}
UnbatchGraphics ();
UnlockMutex (GraphicsLock);
if ((!(GLOBAL (CurrentActivity) & IN_BATTLE)) ||
(GLOBAL (CurrentActivity) & (CHECK_ABORT | CHECK_LOAD)))
{
return FALSE;
}
battle_speed = HIBYTE (nth_frame);
if (battle_speed == (BYTE)~0)
{ // maximum speed, nothing rendered at all
TaskSwitch ();
}
else
{
SleepThreadUntil (bs->NextTime
+ BATTLE_FRAME_RATE / (battle_speed + 1));
bs->NextTime = GetTimeCounter ();
}
if ((GLOBAL (CurrentActivity) & IN_BATTLE) == 0)
return FALSE;
#ifdef NETPLAY
battleFrameCount++;
#endif
return TRUE;
}
static uint8_t calc_crc4(uint16_t cmd, uint8_t cmd_sz, uint8_t value) {
crc_clear(&legic_crc);
crc_update(&legic_crc, (value << cmd_sz) | cmd, 8 + cmd_sz);
return crc_finish(&legic_crc);
}
