Btukfyl

I'm trying to convert the string "Eureka" into its UTF-8 Int64 representation.

I'm trying the following code :

  string message = "Eureka"; // if I use "Eureka" it works...

  byte bytes = System.Text.Encoding.UTF8.GetBytes(message);



  // this fails because I have 6 bytes, not 8 (as required for Int64)

  Int64 m = BitConverter.ToInt64(bytes, 0); 



  byte decodeBites = BitConverter.GetBytes(m);



  string decodeMessage = System.Text.Encoding.UTF8.GetString(decodeBites);



  if (!decodeMessage.Equals(message)) {

    Console.WriteLine("Message mis-match!!!");

  }

Now, because my string is too short, I don't have the right number of bytes and it fails. If I add 2 chars, it works, but then I don't have the desired string in decodeMessage... Pretty sure I need some conversion trick to remove the trailing "0" bytes after the conversion, but none of my attempts work. Any help would be much appreciated!!

UPDATE
The goal is REALLY to have the integer representation of "Euraka", not "Eureka" then trim at the end.... The goals is to use the RSA-method on the obtained Int64, so at the other end, people won't know they have to trim anything...!

Let's pad the array with 0 (to ensure the array contain of 8 bytes) and trim the string from :

string message = "Eureka"; // if I use "Eureka" it works...



byte bytes = System.Text.Encoding.UTF8.GetBytes(message);



byte pad = new byte[bytes.Length < sizeof(Int64) ? sizeof(Int64) - bytes.Length : 0];



// Concat(new byte[...]) - ensure m contains 8 bytes

Int64 m = BitConverter.ToInt64(

  bytes.Concat(pad).ToArray(), 

  0); 



byte decodeBites = BitConverter.GetBytes(m);



// Since we have 8 bytes always, we have to get rid of tail ''

string decodeMessage = System.Text.Encoding.UTF8.GetString(decodeBites).TrimEnd('');



if (!decodeMessage.Equals(message)) {

  Console.WriteLine("Message mis-match!!!");

}

Edit: Since Int64 has 8 and "Eureka" is encoded in 6 only, will-nilly you have to get rid of 2 zero bytes. If you don't want Trim you can Skip them e.g.

byte decodeBites = BitConverter

  .GetBytes(m)

  .TakeWhile(b => b != 0) 

  .ToArray(); 



string decodeMessage = System.Text.Encoding.UTF8.GetString(decodeBites);