/// <summary>
/// Parses the ms-tnef stream from the provided <see cref="System.IO.Stream" />.
/// </summary>
/// <param name="path">A <see cref="System.String" /> specifying the path on which to save the attachments found. Specify the <b>null</b> reference to save them in memory as <see cref="System.IO.MemoryStream" /> instances instead.</param>
/// <returns><b>true</b> if parsing is successful. <b>false</b> otherwise.</returns>
public bool Parse(String path)
{
if (_reader == null || !_reader.BaseStream.CanRead)
return false;
int sig = ReadInt();
if (sig != TnefSignature)
{
return false;
}
bool error = false;
Attachments = new List<SharpAttachment>();
ushort key = ReadUInt16();
System.Text.Encoding enc = SharpMimeHeader.EncodingDefault;
SharpAttachment attachment_cur = null;
for (Byte cur = ReadByte(); cur != Byte.MinValue; cur = ReadByte())
{
TnefLvlType lvl = (TnefLvlType)SharpMimeTools.ParseEnum(typeof(TnefLvlType), cur, TnefLvlType.Unknown);
// Type
int type = ReadInt();
// Size
int size = ReadInt();
// Attibute name and type
TnefAttribute att_n = (TnefAttribute)SharpMimeTools.ParseEnum(typeof(TnefAttribute), (ushort)((type << 16) >> 16), TnefAttribute.Unknown);
TnefDataType att_t = (TnefDataType)SharpMimeTools.ParseEnum(typeof(TnefDataType), (ushort)(type >> 16), TnefDataType.Unknown);
if (lvl == TnefLvlType.Unknown || att_n == TnefAttribute.Unknown || att_t == TnefDataType.Unknown)
{
error = true;
break;
}
// Read data
Byte[] buffer = ReadBytes(size);
// Read checkSum
ushort checksum = ReadUInt16();
// Verify checksum
if (!VerifyChecksum(buffer, checksum))
{
error = true;
break;
}
size = buffer.Length;
if (lvl == TnefLvlType.Message)
{
// Text body
if (att_n == TnefAttribute.Body)
{
if (att_t == TnefDataType.atpString)
{
_body = enc.GetString(buffer, 0, size);
}
// Message mapi props (html body, rtf body, ...)
}
else if (att_n == TnefAttribute.MapiProps)
{
ReadMapi(buffer);
// Stream Codepage
}
else if (att_n == TnefAttribute.OEMCodepage)
{
uint codepage1 = (uint)(buffer[0] + (buffer[1] << 8) + (buffer[2] << 16) + (buffer[3] << 24));
if (codepage1 > 0)
{
try
{
enc = System.Text.Encoding.GetEncoding((int)codepage1);
}
catch (Exception e)
{
Trace.Fail(e.Message, e.StackTrace);
}
}
}
}
else if (lvl == TnefLvlType.Attachment)
{
// Attachment start
if (att_n == TnefAttribute.AttachRendData)
{
String name = String.Concat("generated_", key, "_", (Attachments.Count + 1), ".binary");
if (path == null)
{
attachment_cur = new SharpAttachment();
}
else
{
attachment_cur = new SharpAttachment(new FileInfo(Path.Combine(path, name)));
}
// Attachment name
attachment_cur.Name = name;
}
else if (att_n == TnefAttribute.AttachTitle)
{
if (attachment_cur != null && att_t == TnefDataType.atpString && buffer != null)
{
// NULL terminated string
if (buffer[size - 1] == '\0')
{
size--;
}
if (size > 0)
{
String name = enc.GetString(buffer, 0, size);
if (name.Length > 0)
{
attachment_cur.Name = name;
// Content already saved, so we have to rename
if (attachment_cur.SavedFile != null && attachment_cur.SavedFile.Exists)
{
try
{
attachment_cur.SavedFile.MoveTo(Path.Combine(path, attachment_cur.Name));
}
catch (Exception e)
{
Trace.Fail(e.Message, e.StackTrace);
}
}
}
}
}
// Modification and creation date
}
else if (att_n == TnefAttribute.AttachModifyDate || att_n == TnefAttribute.AttachCreateDate)
{
if (attachment_cur != null && att_t == TnefDataType.atpDate && buffer != null && size == 14)
{
int pos = 0;
DateTime date = new DateTime((buffer[pos++] + (buffer[pos++] << 8)), (buffer[pos++] + (buffer[pos++] << 8)), (buffer[pos++] + (buffer[pos++] << 8)), (buffer[pos++] + (buffer[pos++] << 8)), (buffer[pos++] + (buffer[pos++] << 8)), (buffer[pos++] + (buffer[pos++] << 8)));
if (att_n == TnefAttribute.AttachModifyDate)
{
attachment_cur.LastWriteTime = date;
}
else if (att_n == TnefAttribute.AttachCreateDate)
{
attachment_cur.CreationTime = date;
}
}
// Attachment data
}
else if (att_n == TnefAttribute.AttachData)
{
if (attachment_cur != null && att_t == TnefDataType.atpByte && buffer != null)
{
if (attachment_cur.SavedFile != null)
{
FileStream stream = null;
try
{
stream = attachment_cur.SavedFile.OpenWrite();
}
catch (Exception e)
{
error = true;
break;
}
stream.Write(buffer, 0, size);
stream.Flush();
attachment_cur.Size = stream.Length;
stream.Close();
stream = null;
attachment_cur.SavedFile.Refresh();
// Is name has changed, we have to rename
if (attachment_cur.SavedFile.Name != attachment_cur.Name)
try
{
attachment_cur.SavedFile.MoveTo(Path.Combine(path, attachment_cur.Name));
}
catch (Exception e)
{
Trace.Fail(e.Message, e.StackTrace);
}
}
else
{
attachment_cur.Stream.Write(buffer, 0, size);
attachment_cur.Stream.Flush();
if (attachment_cur.Stream.CanSeek)
attachment_cur.Stream.Seek(0, SeekOrigin.Begin);
attachment_cur.Size = attachment_cur.Stream.Length;
}
Attachments.Add(attachment_cur);
}
// Attachment mapi props
}
else if (att_n == TnefAttribute.Attachment)
{
ReadMapi(buffer);
}
}
}
if (Attachments.Count == 0)
Attachments = null;
return !error;
}
private String ReplaceUrlTokens(String url, SharpAttachment attachment)
{
if (url == null || url.Length == 0 || url.IndexOf('[') == -1 || url.IndexOf(']') == -1)
return url;
if (url.IndexOf("[MessageID]") != -1)
{
url = url.Replace("[MessageID]", HttpUtility.UrlEncode(SharpMimeTools.Rfc2392Url(MessageID)));
}
if (attachment != null && attachment.ContentID != null)
{
if (url.IndexOf("[ContentID]") != -1)
{
url = url.Replace("[ContentID]", HttpUtility.UrlEncode(SharpMimeTools.Rfc2392Url(attachment.ContentID)));
}
if (url.IndexOf("[Name]") != -1)
{
if (attachment.SavedFile != null)
{
url = url.Replace("[Name]", HttpUtility.UrlEncode(attachment.SavedFile.Name));
}
else
{
url = url.Replace("[Name]", HttpUtility.UrlEncode(attachment.Name));
}
}
}
return url;
}
private void UuDecode(String path)
{
if (_body.Length == 0 || _body.IndexOf("begin ") == -1 || _body.IndexOf("end") == -1)
return;
StringBuilder sb = new StringBuilder();
using (StringReader reader = new StringReader(_body))
{
Stream stream = null;
SharpAttachment attachment = null;
for (String line = reader.ReadLine(); line != null; line = reader.ReadLine())
{
if (stream == null)
{
// Found the start point of uuencoded content
if (line.Length > 10 && line[0] == 'b' && line[1] == 'e' && line[2] == 'g' && line[3] == 'i' && line[4] == 'n' && line[5] == ' ' && line[9] == ' ')
{
String name = Path.GetFileName(line.Substring(10));
// In-Memory decoding
if (path == null)
{
attachment = new SharpAttachment();
stream = attachment.Stream;
// Filesystem decoding
}
else
{
attachment = new SharpAttachment(new FileInfo(Path.Combine(path, name)));
stream = attachment.SavedFile.OpenWrite();
}
attachment.Name = name;
// Not uuencoded line, so add it to new body
}
else
{
sb.Append(line);
sb.Append(Environment.NewLine);
}
}
else
{
// Content finished
if (line.Length == 3 && line == "end")
{
stream.Flush();
if (stream.Length > 0)
{
attachment.Size = stream.Length;
Attachments.Add(attachment);
}
// When decoding to a file, close the stream.
if (attachment.SavedFile != null || stream.Length == 0)
{
stream.Close();
}
attachment = null;
stream = null;
// Decode and write uuencoded line
}
else
{
SharpMimeTools.UuDecodeLine(line, stream);
}
}
}
if (stream != null && stream.CanRead)
{
stream.Close();
stream = null;
}
}
_body = sb.ToString();
sb = null;
}
private void ParseMessage(SharpMimeMessage part, MimeTopLevelMediaType types, bool html, SharpDecodeOptions options, String preferredtextsubtype, String path)
{
if ((types & part.Header.TopLevelMediaType) != part.Header.TopLevelMediaType)
{
return;
}
switch (part.Header.TopLevelMediaType)
{
case MimeTopLevelMediaType.multipart:
case MimeTopLevelMediaType.message:
// TODO: allow other subtypes of "message"
if (part.Header.TopLevelMediaType.Equals(MimeTopLevelMediaType.message))
{
// Only message/rfc822 allowed, other subtypes ignored
if (part.Header.SubType == "rfc822")
{
// If NotRecursiveRfc822 option is set, handle part as an attachment
if ((options & SharpDecodeOptions.NotRecursiveRfc822) == SharpDecodeOptions.NotRecursiveRfc822)
{
goto case anmar.SharpMimeTools.MimeTopLevelMediaType.application;
}
}
else
{
break;
}
}
if (part.Header.SubType.Equals("alternative") && part.PartsCount > 0)
{
SharpMimeMessage altenative = null;
// Get the first mime part of the alternatives that has a accepted Mime-Type
for (int i = part.PartsCount; i > 0; i--)
{
SharpMimeMessage item = part.GetPart(i - 1);
if ((types & part.Header.TopLevelMediaType) != part.Header.TopLevelMediaType
|| (!html && item.Header.TopLevelMediaType.Equals(MimeTopLevelMediaType.text) && item.Header.SubType.Equals("html"))
)
{
continue;
}
// First allowed one.
if (altenative == null)
{
altenative = item;
// We don't have to select body part based on subtype if not asked for, or not a text one
// or it's already the preferred one
if (preferredtextsubtype == null || item.Header.TopLevelMediaType != MimeTopLevelMediaType.text || (preferredtextsubtype != null && item.Header.SubType == preferredtextsubtype))
{
break;
}
// This one is preferred over the last part
}
else if (preferredtextsubtype != null && item.Header.TopLevelMediaType == MimeTopLevelMediaType.text && item.Header.SubType == preferredtextsubtype)
{
altenative = item;
break;
}
}
if (altenative != null)
{
// If message body as html is allowed and part has a Content-ID field
// add an anchor to mark this body part
if (html && part.Header.Contains("Content-ID") && (options & SharpDecodeOptions.NamedAnchors) == SharpDecodeOptions.NamedAnchors)
{
// There is a previous text body, so enclose it in <pre>
if (!HasHtmlBody && _body.Length > 0)
{
_body = String.Concat("<pre>", HttpUtility.HtmlEncode(_body), "</pre>");
HasHtmlBody = true;
}
// Add the anchor
_body = String.Concat(_body, "<a name=\"", SharpMimeTools.Rfc2392Url(MessageID), "_", SharpMimeTools.Rfc2392Url(part.Header.ContentID), "\"></a>");
}
ParseMessage(altenative, types, html, options, preferredtextsubtype, path);
}
// TODO: Take into account each subtype of "multipart" and "message"
}
else if (part.PartsCount > 0)
{
foreach (SharpMimeMessage item in part)
{
ParseMessage(item, types, html, options, preferredtextsubtype, path);
}
}
break;
case MimeTopLevelMediaType.text:
if ((part.Disposition == null || !part.Disposition.Equals("attachment"))
&& (part.Header.SubType.Equals("plain") || part.Header.SubType.Equals("html")))
{
bool body_was_html = HasHtmlBody;
// HTML content not allowed
if (part.Header.SubType.Equals("html"))
{
if (!html)
break;
else
HasHtmlBody = true;
}
if (html && part.Header.Contains("Content-ID") && (options & SharpDecodeOptions.NamedAnchors) == SharpDecodeOptions.NamedAnchors)
{
HasHtmlBody = true;
}
if (HasHtmlBody && !body_was_html && !String.IsNullOrEmpty(_body))
{
_body = String.Concat("<pre>", HttpUtility.HtmlEncode(_body), "</pre>");
}
// If message body is html and this part has a Content-ID field
// add an anchor to mark this body part
if (HasHtmlBody && part.Header.Contains("Content-ID") && (options & SharpDecodeOptions.NamedAnchors) == SharpDecodeOptions.NamedAnchors)
{
_body = String.Concat(_body, "<a name=\"", SharpMimeTools.Rfc2392Url(MessageID), "_", SharpMimeTools.Rfc2392Url(part.Header.ContentID), "\"></a>");
}
if (HasHtmlBody && part.Header.SubType.Equals("plain"))
{
_body = String.Concat(_body, "<pre>", HttpUtility.HtmlEncode(part.BodyDecoded), "</pre>");
}
else
_body = String.Concat(_body, part.BodyDecoded);
}
else
{
if ((types & MimeTopLevelMediaType.application) != MimeTopLevelMediaType.application)
{
return;
}
goto case anmar.SharpMimeTools.MimeTopLevelMediaType.application;
}
break;
case MimeTopLevelMediaType.application:
case MimeTopLevelMediaType.audio:
case MimeTopLevelMediaType.image:
case MimeTopLevelMediaType.video:
// Attachments not allowed.
if ((options & SharpDecodeOptions.AllowAttachments) != SharpDecodeOptions.AllowAttachments)
break;
SharpAttachment attachment = null;
// Save to a file
if (path != null)
{
FileInfo file = part.DumpBody(path, true);
if (file != null)
{
attachment = new SharpAttachment(file);
attachment.Name = file.Name;
attachment.Size = file.Length;
}
// Save to a stream
}
else
{
using (MemoryStream stream = new MemoryStream())
{
if (part.DumpBody(stream))
{
if (stream != null && stream.CanSeek)
stream.Seek(0, SeekOrigin.Begin);
attachment = new SharpAttachment(stream);
if (part.Name != null)
attachment.Name = part.Name;
else
attachment.Name = String.Concat("generated_", part.GetHashCode(), ".", part.Header.SubType);
attachment.Size = stream.Length;
}
}
}
if (attachment != null && part.Header.SubType == "ms-tnef" && (options & SharpDecodeOptions.DecodeTnef) == SharpDecodeOptions.DecodeTnef)
{
// Try getting attachments form a tnef stream
Stream stream = attachment.Stream;
SharpTnefMessage tnef = new SharpTnefMessage(stream);
if (tnef.Parse(path))
{
if (tnef.Attachments != null)
{
Attachments.AddRange(tnef.Attachments);
}
attachment.Close();
// Delete the raw tnef file
if (attachment.SavedFile != null)
{
if (stream != null && stream.CanRead)
{
stream.Close();
stream = null;
}
attachment.SavedFile.Delete();
}
attachment = null;
tnef.Close();
}
else
{
// The read-only stream is no longer needed and locks the file
if (attachment.SavedFile != null && stream != null && stream.CanRead)
{
stream.Close();
stream = null;
}
}
stream = null;
tnef = null;
}
if (attachment != null)
{
if (part.Disposition != null && part.Disposition == "inline")
{
attachment.Inline = true;
}
attachment.MimeTopLevelMediaType = part.Header.TopLevelMediaType;
attachment.MimeMediaSubType = part.Header.SubType;
// Store attachment's CreationTime
if (part.Header.ContentDispositionParameters.ContainsKey("creation-date"))
attachment.CreationTime = SharpMimeTools.parseDate(part.Header.ContentDispositionParameters["creation-date"]);
// Store attachment's LastWriteTime
if (part.Header.ContentDispositionParameters.ContainsKey("modification-date"))
attachment.LastWriteTime = SharpMimeTools.parseDate(part.Header.ContentDispositionParameters["modification-date"]);
if (part.Header.Contains("Content-ID"))
attachment.ContentID = part.Header.ContentID;
Attachments.Add(attachment);
}
break;
default:
break;
}
}