public void TestBasicArithmeticCodingRoundtrip2()
{
const string testString = "ユチエフ-8は素晴らしいです";
var data = Encoding.UTF8.GetBytes(testString);
var frequencies = ArithmeticCoder.CalculateFrequencies(data);
var encodedData = ArithmeticCoder.Encode(data, frequencies);
var decodedData = ArithmeticCoder.Decode(encodedData, frequencies, data.Length);
var resultString = Encoding.UTF8.GetString(decodedData);
Console.WriteLine("{0} {1} {2}", data.Length, encodedData.Length, decodedData.Length);
Console.WriteLine(encodedData.Aggregate("", (s, b) => s + ", " + b));
Console.WriteLine(testString);
Console.WriteLine(resultString);
Assert.LessOrEqual(encodedData.Length, data.Length);
Assert.AreEqual(testString, resultString);
}
/// <summary>
/// Decodes a symbol using the <paramref name="coder"/> with the provided
/// <paramref name="model"/>.
/// </summary>
public static TSymbolType Decode <TSymbolType>(this ArithmeticCoder coder, IModel <TSymbolType> model,
ReadBitDelegate bitReader)
where TSymbolType : struct
{
// read value
uint value = coder.DecodeTarget(model.TotalFrequencies);
// determine symbol
RangeSymbol <TSymbolType> rangeSymbol = model.Decode(value);
// adapt decoder
coder.Decode(rangeSymbol.Range, bitReader);
// update model
model.Update(rangeSymbol.Symbol);
return(rangeSymbol.Symbol);
}