void MDFN_BackupSavFile(const uint8 max_backup_count, const char* sav_ext)
{
FileStream cts(MDFN_MakeFName(MDFNMKF_SAVBACK, -1, sav_ext), FileStream::MODE_READ_WRITE, true);
std::unique_ptr<MemoryStream> tmp;
uint8 counter = max_backup_count - 1;
cts.read(&counter, 1, false);
//
//
try
{
tmp.reset(new MemoryStream(new FileStream(MDFN_MakeFName(MDFNMKF_SAV, 0, sav_ext), FileStream::MODE_READ)));
}
catch(MDFN_Error& e)
{
if(e.GetErrno() == ENOENT)
return;
throw;
}
//
//
//
{
try
{
MemoryStream oldbks(new GZFileStream(MDFN_MakeFName(MDFNMKF_SAVBACK, counter, sav_ext), GZFileStream::MODE::READ));
if(oldbks.size() == tmp->size() && !memcmp(oldbks.map(), tmp->map(), oldbks.size()))
{
//puts("Skipped backup.");
return;
}
}
catch(MDFN_Error& e)
{
if(e.GetErrno() != ENOENT)
throw;
}
//
counter = (counter + 1) % max_backup_count;
//
GZFileStream bks(MDFN_MakeFName(MDFNMKF_SAVBACK, counter, sav_ext), GZFileStream::MODE::WRITE, 9);
bks.write(tmp->map(), tmp->size());
bks.close();
}
//
//
cts.rewind();
cts.write(&counter, 1);
cts.close();
}
void solve_system (double* m, int N, double* b, double* x)
{
eliminate (m, N, b);
bks (m, N, b, x);
}
