private void CreateDetectionStream(BodyStreamFormat format, Charset contentCharset, string extraData, bool trustHtmlMetaTag)
{
this.detectorCache = new PooledMemoryStream(8192);
if (extraData != null)
{
byte[] bytes = ConvertUtils.UnicodeEncoding.GetBytes(extraData);
this.detectorCache.Write(bytes, 0, bytes.Length);
}
switch (format)
{
case BodyStreamFormat.Text:
{
if (contentCharset.CodePage == 1200)
{
this.detectorConversionStream = new StreamWrapper(this.detectorCache, false);
return;
}
TextToText textToText = new TextToText(TextToTextConversionMode.ConvertCodePageOnly);
textToText.InputEncoding = contentCharset.GetEncoding();
textToText.OutputEncoding = ConvertUtils.UnicodeEncoding;
textToText.OutputStreamBufferSize = 1024;
textToText.InputStreamBufferSize = 1024;
this.detectorConversionStream = new ConverterStream(new StreamWrapper(this.detectorCache, false), textToText, ConverterStreamAccess.Write);
return;
}
case BodyStreamFormat.Html:
{
HtmlToText htmlToText = new HtmlToText(TextExtractionMode.ExtractText);
htmlToText.InputEncoding = contentCharset.GetEncoding();
htmlToText.OutputEncoding = ConvertUtils.UnicodeEncoding;
htmlToText.DetectEncodingFromMetaTag = trustHtmlMetaTag;
htmlToText.OutputStreamBufferSize = 1024;
htmlToText.InputStreamBufferSize = 1024;
this.detectorConversionStream = new ConverterStream(new StreamWrapper(this.detectorCache, false), htmlToText, ConverterStreamAccess.Write);
return;
}
case BodyStreamFormat.RtfCompressed:
case BodyStreamFormat.RtfUncompressed:
{
RtfToText rtfToText = new RtfToText(TextExtractionMode.ExtractText);
rtfToText.OutputEncoding = ConvertUtils.UnicodeEncoding;
rtfToText.OutputStreamBufferSize = 1024;
rtfToText.InputStreamBufferSize = 1024;
this.detectorConversionStream = new ConverterStream(new StreamWrapper(this.detectorCache, false), rtfToText, ConverterStreamAccess.Write);
if (format == BodyStreamFormat.RtfCompressed)
{
RtfCompressedToRtf rtfCompressedToRtf = new RtfCompressedToRtf();
rtfCompressedToRtf.OutputStreamBufferSize = 1024;
rtfCompressedToRtf.InputStreamBufferSize = 1024;
this.detectorConversionStream = new ConverterStream(this.detectorConversionStream, rtfCompressedToRtf, ConverterStreamAccess.Write);
}
return;
}
default:
return;
}
}
internal Stream ConvertReadStreamFormat(Stream stream)
{
if (this.internalFormat == (InternalBodyFormat)this.format)
{
return(stream);
}
TextConverter converter = null;
if (this.internalFormat == InternalBodyFormat.RtfCompressed)
{
if (!(stream is RtfPreviewStream))
{
stream = new ConverterStream(stream, new RtfCompressedToRtf(), ConverterStreamAccess.Read);
}
if (BodyFormat.Rtf == this.BodyFormat)
{
return(stream);
}
if (BodyFormat.Html == this.BodyFormat)
{
converter = new RtfToHtml
{
OutputEncoding = this.Encoding
};
}
else
{
converter = new RtfToText
{
OutputEncoding = this.Encoding
};
}
}
else if (this.internalFormat == InternalBodyFormat.Enriched)
{
converter = new EnrichedToHtml
{
InputEncoding = this.Encoding,
OutputEncoding = this.Encoding
};
}
return(new ConverterStream(stream, converter, ConverterStreamAccess.Read));
}
public override Stream OpenReadStream(long start, long end)
{
base.ThrowIfDisposed();
BodyFormatConversionStorage.BodyFormatConversion conversion = BodyFormatConversionStorage.GetConversion(this.originalFormat, this.targetFormat);
TextConverter converter = null;
Encoding inputEncoding = null;
if (this.originalCharset != null)
{
inputEncoding = this.originalCharset.GetEncoding();
}
Encoding outputEncoding = null;
if (this.targetCharset != null)
{
outputEncoding = this.targetCharset.GetEncoding();
}
Stream stream = this.originalStorage.OpenReadStream(this.originalStart, this.originalEnd);
switch (conversion)
{
case BodyFormatConversionStorage.BodyFormatConversion.HtmlToText:
converter = new HtmlToText
{
InputEncoding = inputEncoding,
OutputEncoding = outputEncoding
};
break;
case BodyFormatConversionStorage.BodyFormatConversion.HtmlToEnriched:
converter = new HtmlToEnriched
{
InputEncoding = inputEncoding,
OutputEncoding = outputEncoding
};
break;
case BodyFormatConversionStorage.BodyFormatConversion.RtfCompressedToText:
stream = new ConverterStream(stream, new RtfCompressedToRtf(), ConverterStreamAccess.Read);
converter = new RtfToText
{
OutputEncoding = outputEncoding
};
break;
case BodyFormatConversionStorage.BodyFormatConversion.TextToText:
converter = new TextToText
{
InputEncoding = inputEncoding,
OutputEncoding = outputEncoding
};
break;
case BodyFormatConversionStorage.BodyFormatConversion.HtmlToHtml:
converter = new HtmlToHtml
{
InputEncoding = inputEncoding,
OutputEncoding = outputEncoding
};
break;
case BodyFormatConversionStorage.BodyFormatConversion.EnrichedToText:
converter = new EnrichedToText
{
InputEncoding = inputEncoding,
OutputEncoding = outputEncoding
};
break;
}
return(new ConverterStream(stream, converter, ConverterStreamAccess.Read));
}
