internal DirectoryInfoCache LookupDest(string key, int curLen)
{
var cur = Current;
while (true)
{
string nextHead = _tactics.Lookup(key.Substring(curLen, 1));
var child = cur.FindChildren(nextHead);
if (child == null)
{
if (cur == Current)
{
return(null);
}
return(cur);
}
cur = child;
curLen++;
if (key.Length == curLen)
{
return(cur);
}
}
}
