/// <summary>
/// Extracts a Outlook File Attachment object from the given <paramref name="stream"/>
/// </summary>
/// <param name="stream"></param>
/// <param name="outputFolder">The output folder</param>
internal static string ExtractOutlookAttachmentObject(Stream stream, string outputFolder)
{
// Outlook attachments embedded in RTF are firstly embedded in an OLE v1.0 object
var ole10 = new Ole10(stream);
// After that it is wrapped in a compound document
using (var internalStream = new MemoryStream(ole10.NativeData))
using (var compoundFile = new CompoundFile(internalStream))
{
string fileName = null;
var attachDescStream = compoundFile.RootStorage.TryGetStream("AttachDesc");
if (attachDescStream != null)
{
fileName = GetFileNameFromAttachDescStream(attachDescStream);
}
if (string.IsNullOrEmpty(fileName))
{
fileName = Extraction.DefaultEmbeddedObjectName;
}
fileName = FileManager.RemoveInvalidFileNameChars(fileName);
fileName = Path.Combine(outputFolder, fileName);
fileName = FileManager.FileExistsMakeNew(fileName);
var attachContentsStream = compoundFile.RootStorage.TryGetStream("AttachContents");
if (attachContentsStream != null)
{
return(Extraction.SaveByteArrayToFile(attachContentsStream.GetData(), fileName));
}
var mapiMessageStorage = compoundFile.RootStorage.TryGetStorage("MAPIMessage");
if (mapiMessageStorage != null)
{
fileName = Path.Combine(outputFolder, fileName);
return(Extraction.SaveStorageTreeToCompoundFile(mapiMessageStorage, fileName));
}
return(null);
}
}
/// <summary>
/// Extracts a OLE v1.0 object from the given <paramref name="stream"/>
/// </summary>
/// <param name="stream"></param>
/// <param name="outputFolder">The output folder</param>
internal string ExtractOle10(Stream stream, string outputFolder)
{
var ole10 = new Ole10(stream);
if (ole10.Format != OleFormat.File)
{
return(null);
}
switch (ole10.ClassName)
{
case "Package":
var package = new Package(ole10.NativeData);
if (package.Format == OleFormat.Link)
{
return(null);
}
var fileName = Path.GetFileName(package.FileName);
if (string.IsNullOrWhiteSpace(fileName))
{
fileName = Extraction.DefaultEmbeddedObjectName;
}
fileName = Path.Combine(outputFolder, fileName);
return(Extraction.SaveByteArrayToFile(package.Data, fileName));
case "PBrush":
// Ignore
return(null);
default:
if (Extraction.IsCompoundFile(ole10.NativeData))
{
return(Extraction.SaveFromStorageNode(ole10.NativeData, outputFolder, ole10.ItemName));
}
throw new OEObjectTypeNotSupported("Unsupported OleNative ClassName '" +
ole10.ClassName + "' found");
}
}
