private string EncodeOrDecode(SpecialVariableBaseNumber seed, DIRECTION dir)
{
//FIXME This if statement is part of a temporary spike solution.
if (seed.NumDigits < alphabetFrom.TotalInOriginal)
{
seed.ExpandTo(alphabetFrom.TotalInOriginal);
}
Debug.Assert(seed.NumDigits == alphabetFrom.TotalInOriginal);
Debug.Assert(seed.NumDigits == alphabetTo.TotalInOriginal);
Debug.Assert(seed.ToBigInt() < NumSeeds);
Dictionary <char, char> alphabetMap = new Dictionary <char, char>();
alphabetFrom.Reset();
alphabetTo.Reset();
for (int i = 0; i < alphabetFrom.TotalInOriginal; ++i)
{
char key = alphabetFrom[0];
char value = alphabetTo[seed[i]];
alphabetMap.Add(key, value);
alphabetFrom.Remove(key);
alphabetTo.Remove(value);
}
//TODO Look into a more effecient way of doing this, by constructing the desired map directly
if (dir == DIRECTION.DECODE)
{
alphabetMap = alphabetMap.ToDictionary(kp => kp.Value, kp => kp.Key);
}
StringBuilder sb = new StringBuilder();
foreach (char c in original)
{
if (c == '\n')
{
sb.Append(c);
}
else
{
sb.Append(alphabetMap[c]);
}
}
return(sb.ToString());
}
public override string Encode(SpecialVariableBaseNumber seed)
{
return(EncodeOrDecode(seed, DIRECTION.ENCODE));
}
public string Decode(String key)
{
SpecialVariableBaseNumber specialNum = stringToSpecialNum(key);
return(Decode(specialNum));
}
public abstract string Decode(SpecialVariableBaseNumber seed);
