public void decryption(string filename)
{
string ciphertext = ReadTextInFile.readtext(filename);
string text = new string("");
string buffer = new string("");
int firstlette = 0;
bool endletter = false;
for (int i = 0; i < ciphertext.Length; i++)
{
if (this.Isletter(ciphertext[i]))//буква или была буква
{
endletter = true;
firstlette = i;
for (int j = i + 1; j < ciphertext.Length; j++, i++)
{
if (this.Isletter(ciphertext[j]))
{
int secondlette = j;
string bigram = new string("");
bigram += ciphertext[firstlette];
bigram += ciphertext[secondlette];
List <int> coord = coordinatesbigram(bigram);
text += LetterFromNumber(coord[0]);
text += buffer;
text += LetterFromNumber(coord[1]);
buffer = null;
i = j;
break;
}
else
{
buffer += ciphertext[j];
}
}
}
else
{
text += ciphertext[i];
}
if (text.Length > 10000)
{
WriteTextInFile.writetext("OriginalText.txt", text);
text = null;
}
}
if (endletter)
{
text += ciphertext[firstlette];
text += buffer;
}
WriteTextInFile.writetext("OriginalText.txt", text);
}
//private int NumberLetter(char c)
//{
// switch (c)
// {
// case 'a':return 0;
// case 'b': return 1;
// case 'c': return 2;
// case 'd': return 3;
// case 'e': return 4;
// case 'f': return 5;
// case 'g': return 6;
// case 'h': return 7;
// case 'i': return 8;
// case 'j': return 9;
// case 'k': return 10;
// case 'l': return 11;
// case 'm': return 12;
// case 'n': return 13;
// case 'o':return 14;
// case 'p': return 15;
// case 'q': return 16;
// case 'r': return 17;
// case 's': return 18;
// case 't': return 19;
// case 'u': return 20;
// case 'v': return 21;
// case 'w': return 22;
// case 'x': return 23;
// case 'y': return 24;
// case 'z': return 25;
// default: return -1;
// }
//}
public void encryption(string filename)
{
string inputtext = ReadTextInFile.readtext(filename);
string cryptogram = new string("");
string buffer = new string("");
int firstlette = 0;
bool endletter = false;
for (int i = 0; i < inputtext.Length; i++)
{
if (this.Isletter(inputtext[i])) //буква или была буква
{
endletter = true;
firstlette = i;
for (int j = i + 1; j < inputtext.Length; j++, i++)
{
if (this.Isletter(inputtext[j]))
{
int secondlette = j;
int horizontalIndex = this.NumberLetter(inputtext[firstlette]);
int verticalIndex = this.NumberLetter(inputtext[secondlette]);
cryptogram += this.table[horizontalIndex, verticalIndex][0];
cryptogram += buffer;
cryptogram += this.table[horizontalIndex, verticalIndex][1];
buffer = null;
endletter = false;
i = j;
break;
}
else
{
buffer += inputtext[j];
}
}
}
else
{
cryptogram += inputtext[i];
}
if (cryptogram.Length > 10000)
{
WriteTextInFile.writetext("cryptogram.txt", cryptogram);
cryptogram = null;
}
}
if (endletter)
{
cryptogram += inputtext[firstlette];
cryptogram += buffer;
}
WriteTextInFile.writetext("cryptogram.txt", cryptogram);
}