private static void CheckHtml(MimeEntity entity)
{
if (entity.DataText.Trim().Length == 0)
{
entity.WrapDataText("<html>", "</html>");
}
else
{
var ipos = 0;
var c = entity.DataText[ipos];
while (ipos < entity.DataText.Length - 1 && (c == ' ' || c == '\t' || c == '\r' || c == '\n'))
{
c = entity.DataText[++ipos];
}
var dtstr = entity.DataText.Substring(0, "<!DOCTYPE".Length);
if (dtstr.ToUpper() == "<!DOCTYPE")
{
ipos = entity.DataText.IndexOf('>', ipos + "<!DOCTYPE".Length);
while (ipos < entity.DataText.Length - 1 && (c == ' ' || c == '\t' || c == '\r' || c == '\n'))
{
c = entity.DataText[++ipos];
}
}
if (ipos > 4 && ipos < entity.DataText.Length - 5)
{
var hdr = entity.DataText.Substring(ipos, 4);
if (hdr.ToLower() == "<div")
{
entity.WrapDataText("<html>", "</html>");
}
}
else
{
entity.WrapDataText("<html>", "</html>");
}
}
}