private void OnRotorHitNotch(Rotor rotor, bool forward)
{
var index = Rotors.IndexOf(rotor);
if (index == -1)
{
throw new NullReferenceException("The rotor that hit the notch was not found");
}
if (index == Rotors.Count - 1)
{
return; //the last rotor, no need to rotate
}
//Perform any necessary double stepping
if (DoubleStep && index + 1 >= Rotors.Count)
{
if (Rotors[index + 1].IsTurnOver())
{
Rotors[index + 1].Rotate();
}
}
index++; //Rotate the next rotor;
Rotors[index].Rotate(forward);
}
public char Encode(char character, bool moveRotor = true)
{
if (!char.IsLetter(character))
{
return(character);
}
if (moveRotor)
{
MoveRotors();
}
var encodedCharacter = character;
foreach (var rotor in Rotors)
{
encodedCharacter = rotor.Encode(encodedCharacter);
}
encodedCharacter = Reflector.Reflect(encodedCharacter);
foreach (var rotor in Rotors.AsEnumerable().Reverse())
{
encodedCharacter = rotor.InverseEncode(encodedCharacter);
}
return(encodedCharacter);
}
public Settings(MachineType typ, ReflectorType refTyp, RotorName[] rotors, int[] ringPos, string[] plugs)
: this(typ, refTyp)
{
MachineType = typ;
ReflectorType = refTyp;
if (MachineType == MachineType.M4K)
{
if (refTyp == ReflectorType.B_Dunn)
{
Rotors.Add(new RotorSetting(RotorName.Beta, 0));
}
else
{
Rotors.Add(new RotorSetting(RotorName.Gamma, 0));
}
}
Rotors.Add(new RotorSetting(RotorName.I, 0));
Rotors.Add(new RotorSetting(RotorName.II, 0));
Rotors.Add(new RotorSetting(RotorName.III, 0));
Plugs.Clear();
for (int i = 0; i < rotors.Length; i++)
{
if (i <= Rotors.Count)
{
Rotors[i].Name = rotors[i];
if (i <= ringPos.Length)
{
Rotors[i].RingSetting = ringPos[i];
}
}
}
for (int i = 0; i < 10; i++)
{
if (i <= plugs.Length)
{
Plugs.Add(new PlugSetting(plugs[i]));
}
}
}
/// <summary>
/// Creates a new instance of an Enigma Machine with the provided rotors
/// </summary>
/// <param name="rotors">The rotors to be used by the Enigma Machine</param>
public EnigmaMachine(IEnumerable <Rotor> rotors)
{
Rotors.CollectionChanged += OnRotorsChanged;
Rotors.AddRange(rotors);
}
/// <summary>
/// Rotates the rotor to the appropriate slot
/// </summary>
/// <param name="r"></param>
/// <param name="offset"></param>
public void RotateRotor(Rotors r, int offset)
{
int lastIndex = r.GetCipher().Length - 1;
r.Rotate(offset <0 || offset> lastIndex ? lastIndex : offset);
}
/// <summary>
/// Determines if the next rotor needs to be rotated
/// </summary>
/// <param name="num">the rotor index</param>
/// <returns></returns>
public bool CheckIfRotate(int num)
{
return(rotors[num].GetLastAlphabetLetter() == Rotors.GetRotorAdvancements(rotors[num].CipherNumber));
}
/// <summary>
/// Sets the rotor with the passed parameter
/// </summary>
/// <param name="index">the rotor number</param>
/// <param name="rotor">the rotor settings</param>
public void SetRotor(int index, Rotors rotor)
{
rotors[index] = rotor;
}
/// <summary>
/// Gets the letter at the given index in the alphabet string
/// as well as the index of the letter in the cipher
/// </summary>
/// <param name="l">the letter to retrieve</param>
/// <param name="i">the index of the letter</param>
/// <param name="r">the rotor to search through</param>
public static void LeftToRight(ref char l, ref int i, Rotors r)
{
l = r.LetterInAlphabet(i);
i = r.CipherLetterIndex(l);
}
/// <summary>
/// Gets the letter at the given index in the cipher
/// as well as the index of the letter in the alphabet string
/// </summary>
/// <param name="l">the letter to retrieve</param>
/// <param name="i">the index of the letter</param>
/// <param name="r">the rotor to search through</param>
public static void RightToLeft(ref char l, ref int i, Rotors r)
{
l = r.LetterInCipher(i);
i = r.AlphabetLetterIndex(l);
}
public Settings(MachineType typ, ReflectorType refTyp, params object[] args)
: this(typ, refTyp)
{
MachineType = typ;
ReflectorType = refTyp;
if (MachineType == MachineType.M4K)
{
if (refTyp == ReflectorType.B_Dunn)
{
Rotors.Add(new RotorSetting(RotorName.Beta, 0));
}
else
{
Rotors.Add(new RotorSetting(RotorName.Gamma, 0));
}
}
Rotors.Add(new RotorSetting(RotorName.I, 0));
Rotors.Add(new RotorSetting(RotorName.II, 0));
Rotors.Add(new RotorSetting(RotorName.III, 0));
Plugs.Clear();
List <RotorName> rotorNames = new List <RotorName>();
List <int> ringSettings = new List <int>();
List <string> plugSettings = new List <string>();
foreach (var item in args)
{
if (item is RotorName)
{
rotorNames.Add((RotorName)item);
continue;
}
if (item is int)
{
ringSettings.Add((int)item);
continue;
}
if (item is string)
{
plugSettings.Add((string)item);
continue;
}
}
for (int i = 0; i < rotorNames.Count; i++)
{
if (i <= Rotors.Count)
{
Rotors[i].Name = rotorNames[i];
if (i <= ringSettings.Count)
{
Rotors[i].RingSetting = ringSettings[i];
}
}
}
for (int i = 0; i < 10; i++)
{
if (i <= plugSettings.Count)
{
Plugs.Add(new PlugSetting(plugSettings[i]));
}
}
}
/// <summary></summary>
public override string ToString()
{
return(Reflector.ToString() + " / " + Rotors.ToOneString(" / ") + " / Plugs: " + PlugBoard.ToString());
}
/// <summary>
/// Full constructor for a Rotor.
/// </summary>
/// <param name="chosenRotor">Which Rotor from the Rotors enumeration you want.</param>
/// <param name="ringOffset">Position A on the wiring map matches this position on the indicator ring.</param>
/// <exception cref="InvalidRotorChoiceException"/>
/// <exception cref="InvalidLetterException"/>
public Rotor(Rotors chosenRotor, int ringOffset)
{
RightToLeftMapping = new LinkedList<int>();
LeftToRightMapping = new LinkedList<int>();
// Bail early and hard if conditions aren't perfect.
if (!Enum.IsDefined(typeof(Rotors), chosenRotor) || chosenRotor == Rotors.BadRotor)
{
throw new InvalidRotorChoiceException("Sorry, The chosen rotor must be Rotors.I and Rotors.Gamma.");
}
if (ringOffset < 0 || ringOffset > 25)
{
throw new InvalidLetterException("Sorry, the ring offset must be between 0 and 25.");
}
// Create the Dictionaries
SortedDictionary<EnigmaAlphabet, EnigmaAlphabet> rightToLeftMappingDictionary = new SortedDictionary<EnigmaAlphabet, EnigmaAlphabet>();
SortedDictionary<EnigmaAlphabet, EnigmaAlphabet> leftToRightMappingDictionary = new SortedDictionary<EnigmaAlphabet, EnigmaAlphabet>();
// The Right to Left direction is represented directly by the string
// from RotorStrings. So I can just directly map it.
// This is a lot cleaner in the Java version due to Java's much superior
// handling of Enumerations.
for (int index = 0; index < RotorStrings[(int)chosenRotor].Length; index++)
{
rightToLeftMappingDictionary.Add((EnigmaAlphabet)index,
(EnigmaAlphabet)Enum.Parse(typeof(EnigmaAlphabet), RotorStrings[(int)chosenRotor].Substring(index, 1)));
}
// The Left to Right direction is built by inverting the Key to Value relationship
// in the Right to Left dictionary.
foreach (KeyValuePair<EnigmaAlphabet, EnigmaAlphabet> kvp in rightToLeftMappingDictionary)
{
leftToRightMappingDictionary.Add(kvp.Value, kvp.Key);
}
// now that I have created a sorted key to value mapping convert those mappings into lists.
RightToLeftMapping = new LinkedList<int>(rightToLeftMappingDictionary.Values.Cast<int>());
LeftToRightMapping = new LinkedList<int>(leftToRightMappingDictionary.Values.Cast<int>());
indicatorTransferPositon = new int[2];
indicatorTransferPositon[0] = RotorTurnoverList[(int)chosenRotor, 0];
indicatorTransferPositon[1] = RotorTurnoverList[(int)chosenRotor, 1];
Offset = ringOffset;
// Shift the rotor's wiring forward until the correct offset between the indicator and the rotor's wiring is achieved
if (ringOffset != 0 )
{
Shift(ringOffset);
}
_Indicator = 0;
}
/// <summary>
/// Quick constructor for a Rotor. Useful when you aren't changing the offset of the wiring.
/// </summary>
/// <param name="chosenRotor">Which Rotor from the Rotors enumeration you want.</param>
/// <seealso cref="Rotor(Rotors, int)">
/// This constructor has the same constraints and exceptions as the full constructor for Rotor.
/// </seealso>
public Rotor(Rotors chosenRotor)
: this(chosenRotor, 0)
{
}