public override bool FilterHeaderList(HeaderList headerList, Stream stream)
{
Header header = headerList.FindFirst(HeaderId.ContentTransferEncoding);
if (header != null)
{
ContentTransferEncoding encodingType = MimePart.GetEncodingType(header.FirstRawToken);
if (encodingType == ContentTransferEncoding.EightBit || encodingType == ContentTransferEncoding.Binary)
{
ContentTypeHeader typeHeader = headerList.FindFirst(HeaderId.ContentType) as ContentTypeHeader;
bool flag;
bool flag2;
EightToSevenBitConverter.Analyse(typeHeader, out this.embedded, out flag, out flag2);
for (MimeNode mimeNode = headerList.FirstChild; mimeNode != null; mimeNode = mimeNode.NextSibling)
{
if (HeaderId.ContentTransferEncoding == (mimeNode as Header).HeaderId)
{
if (flag || this.embedded)
{
this.encoder = null;
}
else if (flag2)
{
stream.Write(EightToSevenBitConverter.CteQP, 0, EightToSevenBitConverter.CteQP.Length);
this.encoder = new QPEncoder();
}
else
{
stream.Write(EightToSevenBitConverter.CteBase64, 0, EightToSevenBitConverter.CteBase64.Length);
this.encoder = new Base64Encoder();
}
}
else
{
mimeNode.WriteTo(stream);
}
}
stream.Write(MimeString.CrLf, 0, MimeString.CrLf.Length);
return(true);
}
}
return(false);
}
public static void Convert(Stream source, Stream destination)
{
int i = 0;
byte[][] array = null;
byte[] array2 = null;
using (Stream stream = new SuppressCloseStream(source))
{
using (MimeReader mimeReader = new MimeReader(stream, true, DecodingOptions.Default, MimeLimits.Unlimited, true, false))
{
while (mimeReader.ReadNextPart())
{
while (i >= mimeReader.Depth)
{
byte[] array3 = array[--i];
if (array3 != null)
{
destination.Write(array3, 0, array3.Length - 2);
destination.Write(MimeString.TwoDashesCRLF, 0, MimeString.TwoDashesCRLF.Length);
}
}
if (i > 0)
{
byte[] array3 = array[i - 1];
if (array3 != null)
{
destination.Write(array3, 0, array3.Length);
}
}
HeaderList headerList = HeaderList.ReadFrom(mimeReader);
ContentTypeHeader contentTypeHeader = headerList.FindFirst(HeaderId.ContentType) as ContentTypeHeader;
bool flag;
bool flag2;
bool flag3;
EightToSevenBitConverter.Analyse(contentTypeHeader, out flag, out flag2, out flag3);
Header header = headerList.FindFirst(HeaderId.ContentTransferEncoding);
if (flag2 || flag)
{
if (header != null)
{
headerList.RemoveChild(header);
}
headerList.WriteTo(destination);
byte[] array3;
if (flag)
{
array3 = null;
destination.Write(MimeString.CrLf, 0, MimeString.CrLf.Length);
}
else
{
array3 = MimePart.GetBoundary(contentTypeHeader);
}
if (array == null)
{
array = new byte[4][];
}
else if (array.Length == i)
{
byte[][] array4 = new byte[array.Length * 2][];
Array.Copy(array, 0, array4, 0, i);
array = array4;
}
array[i++] = array3;
}
else
{
Stream stream2 = null;
try
{
stream2 = mimeReader.GetRawContentReadStream();
if (header != null && stream2 != null)
{
ContentTransferEncoding encodingType = MimePart.GetEncodingType(header.FirstRawToken);
if (encodingType == ContentTransferEncoding.EightBit || encodingType == ContentTransferEncoding.Binary)
{
if (flag3)
{
header.RawValue = MimeString.QuotedPrintable;
stream2 = new EncoderStream(stream2, new QPEncoder(), EncoderStreamAccess.Read);
}
else
{
header.RawValue = MimeString.Base64;
stream2 = new EncoderStream(stream2, new Base64Encoder(), EncoderStreamAccess.Read);
}
}
}
headerList.WriteTo(destination);
destination.Write(MimeString.CrLf, 0, MimeString.CrLf.Length);
if (stream2 != null)
{
DataStorage.CopyStreamToStream(stream2, destination, long.MaxValue, ref array2);
}
}
finally
{
if (stream2 != null)
{
stream2.Dispose();
}
}
}
}
while (i > 0)
{
byte[] array3 = array[--i];
if (array3 != null)
{
destination.Write(array3, 0, array3.Length - 2);
destination.Write(MimeString.TwoDashesCRLF, 0, MimeString.TwoDashesCRLF.Length);
}
}
}
}
}