CODEWITHSUNDEEP
c#utf8-decode
Nergon
Nergon

Reputation: 453

Decoding a base64 string from windows phone

i am getting a Soap response which contains a base64 string. I am using XDocument to get the value of the element and a function like this to read it

 public void main()
    {
  //****UPDATE
  string data64 = "";
  data64 = removeNewLinesFromString(data64);
  content = data64.ToCharArray();

  byte[] binaryData = Convert.FromBase64CharArray(content, 0, content.Length);
  Stream stream  = new MemoryStream(binaryData);
  BinaryReader reader = new BinaryReader(stream,Encoding.UTF8);                                        
  string object64 = SoapSerializable.ReadUTF(reader);
  }

this is the readUTF function

   public static String ReadUTF(BinaryReader reader)
        {
            // read the following string's length in bytes
            int length = Helpers.FlipInt32(reader.ReadInt32());

            // read the string's data bytes
            byte[] utfString = reader.ReadBytes(length);

            // get the string by interpreting the read data as UTF-8
            return System.Text.Encoding.UTF8.GetString(utfString, 0, utfString.Length);
        }

and my FlipInt32 function

public static Int32 FlipInt32(Int32 value)
        {
            Int32 a = (value >> 24) & 0xFF;
            Int32 b = (value >> 16) & 0xFF;
            Int32 c = (value >> 8) & 0xFF;
            Int32 d = (value >> 0) & 0xFF;
            return (((((d << 8) | c) << 8) | b) << 8) | a;
        }

but the resulting values are slightly different from the results an online decoder gives.

I am missing something here?

Upvotes: 0

Views: 984

Answers (1)

L.B
L.B

Reputation: 116118

I am not sure what you are trying to do with BinaryReader But here is what I do to get this is a dummy encoded base64 string from your base64 data

string data64 = "dGhpcyBpcyBhIGR1bW15IGVuY29kZWQgYmFzZTY0IHN0cmluZy4=";
var buf = Convert.FromBase64String(data64);
var str = Encoding.UTF8.GetString(buf);

Upvotes: 3

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