public DataStreamContext(Uri u)
{
string[] parts = u.PathAndQuery.Split(new [] { ',' }, 2);
if (parts.Length != 2)
{
throw RuntimeFailure.NotValidDataUri();
}
var ct = Regex.Replace(parts[0], ";base64", string.Empty);
if (ct.Length == 0)
{
_contentType = new ContentType("text", "plain");
}
else
{
_contentType = ContentType.Parse(ct);
}
byte[] buffer;
_isBase64 = ct.Length < parts[0].Length; // implied by replacement
if (_isBase64)
{
buffer = Convert.FromBase64String(parts[1]);
}
else
{
buffer = System.Text.Encoding.ASCII.GetBytes(WebUtility.UrlDecode(parts[1]));
}
_baseUri = string.Concat("data:",
_contentType,
_isBase64 ? ";base64" : string.Empty,
",");
_data = new MemoryStream(buffer.Length);
_data.Write(buffer, 0, buffer.Length);
}