Is there a Base64Stream for .NET? where?

Question

If I want to produce a Base64-encoded output, how would I do that in .NET?

I know that since .NET 2.0, there is the ICryptoTransform interface, and the ToBase64Transform() and FromBase64Transform() implementations of that interface.

But those classes are embedded into the System.Security namespace, and require the use of a TransformBlock, TransformFinalBlock, and so on.

Is there an easier way to base64 encode a stream of data in .NET?

Answer 1

Richard Grimes posted one here:
http://www.grimes.demon.co.uk/workshops/encodedStream.htm

Also, there's an implementation available under the MS-PL here:
http://cheeso.members.winisp.net/srcview.aspx?file=Base64stream.cs

This latter one lets you do this, for example, to compress then base64-encode a file:

byte[] working= new byte[1024];
int n;
using (Stream input = File.OpenRead(fileToCompress))
{
    using (Stream output = new MemoryStream())
    {
        using (var b64 = new Base64Stream(output, Base64Stream.Mode.Encode))
        {
            b64.Rfc2045Compliant = true; // OutputLineLength = 76;

            using (var compressor = new DeflateStream(b64, CompressionMode.Compress, true))
            {
                while ((n = input.Read(working, 0, working.Length)) != 0)
                {
                    compressor.Write(working, 0, n);
                }
            }
        }
    }
}

Answer 2

System.Convert provides that, here is a code sample that might help

private string EncodeBase64(string toEncode)
    {
      byte[] toEncodeAsBytes
            = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
      string returnValue
            = System.Convert.ToBase64String(toEncodeAsBytes);
      return returnValue;
    }

Answer 3

If you want a stream that converts to Base64, you can put a ToBase64Transform into a CryptoStream:

new CryptoStream(stream, new ToBase64Transform(), CryptoStreamMode.Write)

If you just want to convert a single byte array to Base64, you can simply call Convert.ToBase64String(bytes).

In base cases, you can replace the word To with From.

Answer 4

This should do what you are looking for:

http://mews.codeplex.com/SourceControl/changeset/view/52969#392973