public Base30Converter()
{
bitness = ALLCHARS.Length / 2; // will equal 30
charmap = new Dictionary<char,int>();
charmap_tail = new Dictionary<char,int>();
for (int i = 0; i < bitness; i++)
{
charmap.Add(ALLCHARS[i], i);
charmap_tail.Add(ALLCHARS[i+bitness], i);
}
}