public AnsCodingTable(FrequencyDictionary <int> observedFrequencies, int denominator = -1, byte[] encryptionKey = null)
{
if (denominator <= 0)
{
denominator = DEFAULT_DENOMINATOR;
}
Denominator = (int)observedFrequencies.TotalFrequency;
FrequencyDictionary = new Dictionary <int, Fraction>();
foreach (FrequencyStorage <int> feature in observedFrequencies.GetSortedFrequencies())
{
FrequencyDictionary[feature.ContainedObject] = new Fraction(feature.Frequency, Denominator);
}
List <Fraction> toSimplify = new List <Fraction>();
foreach (KeyValuePair <int, Fraction> pair in FrequencyDictionary)
{
toSimplify.Add(pair.Value);
}
toSimplify.Sort(Fraction.SORTER);
int sharedDenominator = denominator;
try
{
Fraction.ScaleFractionsToDenominator(toSimplify, sharedDenominator);
} catch (ArgumentOutOfRangeException e)
{
throw new ArgumentException("Denominator insufficient to construct table without losing frequency fidelity. Either reduce the block size, or increase the denominator", e);
}
Streamer = new CodingTableStreamer(FrequencyDictionary);
Denominator = toSimplify[0].Denominator;
GenerateTable(encryptionKey);
}
