Database TryLoad(MemoryStream databaseStream)
{
//create a copy of the stream so we can try again if we get an exception which indicates we should change parameters
//This is not optimal in terms of (short-time) memory usage but is hard to avoid because the Keepass library closes streams also in case of errors.
//Alternatives would involve increased traffic (if file is on remote) and slower loading times, so this seems to be the best choice.
MemoryStream workingCopy = new MemoryStream();
databaseStream.CopyTo(workingCopy);
workingCopy.Seek(0, SeekOrigin.Begin);
//reset stream if we need to reuse it later:
databaseStream.Seek(0, SeekOrigin.Begin);
//now let's go:
try
{
Database newDb = _app.LoadDatabase(_ioc, workingCopy, _compositeKey, StatusLogger, _format);
Kp2aLog.Log("LoadDB OK");
//make sure the stored access time for the actual file is more recent than that of its backup
Thread.Sleep(10);
SaveFileData(_ioc, _keyfileOrProvider);
Finish(true, _format.SuccessMessage);
return(newDb);
}
catch (OldFormatException)
{
_format = new KdbDatabaseFormat(_app);
return(TryLoad(databaseStream));
}
catch (InvalidCompositeKeyException)
{
KcpPassword passwordKey = (KcpPassword)_compositeKey.GetUserKey(typeof(KcpPassword));
if ((passwordKey != null) && (passwordKey.Password.ReadString() == "") && (_compositeKey.UserKeyCount > 1))
{
//if we don't get a password, we don't know whether this means "empty password" or "no password"
//retry without password:
_compositeKey.RemoveUserKey(passwordKey);
//retry:
return(TryLoad(databaseStream));
}
else
{
throw;
}
}
}
