private StringBuilder MoveString(StringBuilder inputSrting, int key, TypeCoding typeCoding) { StringBuilder outputString = new StringBuilder(); int tempKey = key; if (typeCoding == TypeCoding.DECODING) { tempKey = -key; } for (int i = 0; i < inputSrting.Length; i++) { if (Char.IsLetter(inputSrting[i])) { int temp = UA_Alphabet.GetNumber(inputSrting[i]); if (Exist(temp)) { temp += tempKey; if (IsCorrectNumber(temp)) { outputString.Append(UA_Alphabet.GetChar(temp)); } else { if (typeCoding == TypeCoding.DECODING) { outputString.Append(UA_Alphabet.GetChar(UA_Alphabet.AlphabetLength + tempKey)); } else { outputString.Append(UA_Alphabet.GetChar(UA_Alphabet.AlphabetLength - tempKey)); } } } else { outputString = new StringBuilder(_messageErrorLetter + inputSrting[i]); return(null); } } } return(outputString); }
public StringBuilder DecodingWithoutKey(StringBuilder inputString) { StringBuilder res = null; char offerLetter = TextAnalyser.GetOffenLetter(inputString); for (int i = 0; i < UA_Alphabet.LoudLetterLenght; i++) { int numbetween = UA_Alphabet.GetNumBetweenLetter(offerLetter, UA_Alphabet.GetLoudLetter(i)); StringBuilder partText = GetFirstPart(inputString); StringBuilder partTextResult = DecodingUA(partText, numbetween); if (CorrectText(partTextResult)) { return(DecodingUA(inputString, numbetween)); } } return(res); }