ContentEncoding GetFinalEncoding(MimePart part)
{
if ((Capabilities & SmtpCapabilities.BinaryMime) != 0)
{
// no need to re-encode...
return(part.ContentTransferEncoding);
}
if ((Capabilities & SmtpCapabilities.EightBitMime) != 0)
{
switch (part.ContentTransferEncoding)
{
case ContentEncoding.Default:
case ContentEncoding.Binary:
break;
default:
// all other Content-Transfer-Encodings are safe to transmit...
return(part.ContentTransferEncoding);
}
}
switch (part.ContentTransferEncoding)
{
case ContentEncoding.EightBit:
case ContentEncoding.Default:
case ContentEncoding.Binary:
break;
default:
// all other Content-Transfer-Encodings are safe to transmit...
return(part.ContentTransferEncoding);
}
ContentEncoding encoding;
if ((Capabilities & SmtpCapabilities.BinaryMime) != 0)
{
encoding = part.GetBestEncoding(EncodingConstraint.None);
}
else if ((Capabilities & SmtpCapabilities.EightBitMime) != 0)
{
encoding = part.GetBestEncoding(EncodingConstraint.EightBit);
}
else
{
encoding = part.GetBestEncoding(EncodingConstraint.SevenBit);
}
if (encoding == ContentEncoding.SevenBit)
{
return(encoding);
}
part.ContentTransferEncoding = encoding;
return(encoding);
}
public void TestPrepare()
{
using (var content = new MemoryStream(new byte[64], false)) {
var part = new MimePart("application/octet-stream")
{
Content = new MimeContent(content)
};
var encoding = part.GetBestEncoding(EncodingConstraint.SevenBit);
Assert.AreEqual(ContentEncoding.Base64, encoding, "GetBestEncoding");
part.Prepare(EncodingConstraint.SevenBit);
Assert.AreEqual(ContentEncoding.Base64, part.ContentTransferEncoding, "Prepare #1");
// now make sure that calling Prepare() again doesn't change anything
part.Prepare(EncodingConstraint.SevenBit);
Assert.AreEqual(ContentEncoding.Base64, part.ContentTransferEncoding, "Prepare #2");
part.ContentTransferEncoding = ContentEncoding.Binary;
part.Prepare(EncodingConstraint.None);
Assert.AreEqual(ContentEncoding.Binary, part.ContentTransferEncoding, "Prepare #3");
part.Prepare(EncodingConstraint.SevenBit);
Assert.AreEqual(ContentEncoding.Base64, part.ContentTransferEncoding, "Prepare #4");
}
}
