Decoding string Char.Parse issue

debugcn Published at Dev

Hidalgo

I have the following code to encode a plain text:

int AddNumber;
int AsciiNumber;
string OneChar;
string String1 = "DAVE SMITH";
string String2 = "";
for (int i = 0; i < String1.Length; i++)
{
    AddNumber = i + 95;
    AsciiNumber = (int)Char.Parse(String1.Substring(i,1));

    byte[] NewAscii = new byte[] { Convert.ToByte( AsciiNumber + AddNumber ) };

    // Get string of the NewAscii
    OneChar = Encoding.GetEncoding(1252).GetString(NewAscii);

    String2 = String2 + OneChar;
 }

The problem I have is how to decode the string back to plain text. Here is my attempt code:

String1 = "";
for (int i = 0; i < String2.Length; i++)
{
    AddNumber = i + 95;

    AsciiNumber = (int)Char.Parse(String2.Substring(i,1));

    byte[] NewAscii = new byte[] { Convert.ToByte( AsciiNumber - AddNumber ) };

    // Get string of the NewAscii
    OneChar = Encoding.GetEncoding(1252).GetString(NewAscii);

    String1 = String1 + OneChar;
 }

The problem is that above, on processing the encoded empty space (between DAVE and SMITH), the value AsciiNumber = (int)Char.Parse(String2.Substring(i,1)) is 402 where it should be 131.

Do you see what I am misunderstanding?

Mahmoud Darwish

For the decoding part

        String1 = "";
        for (int i = 0; i < String2.Length; i++)
        {
            var charByte = System.Text.Encoding.GetEncoding(1252).GetBytes(String2.Substring(i, 1));
            AddNumber = i + 95;
            AsciiNumber = Convert.ToInt32(charByte[0]) - AddNumber;
            String1 += Convert.ToChar(AsciiNumber);

        }

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