private static MimeHeader Encode(MimeHeader header)
{
var format = header.Format ?? MimeFormat.Unspecified;
return new MimeHeader(header.Name, EncodeHeaderFieldBody(header, format.Folding - 1/*HT*/, header.Name.Length + 2, format.GetHeaderFoldingString()));
}
private static MimeHeaderCollection ParseHeader(LineOrientedStream stream)
{
var headers = new MimeHeaderCollection();
MimeHeader current = null;
for (;;) {
var lineBytes = stream.ReadLine(false);
if (lineBytes == null)
break; // unexpected end of stream
var line = new ByteString(lineBytes);
if (line.IsEmpty)
break; // end of headers
if (line[0] == Octets.HT || line[0] == Octets.SP) { // LWSP-char
// folding
if (current == null)
// ignore incorrect formed header
continue;
current.Value += Chars.SP;
current.Value += line.TrimStart().ToString();
}
else {
// field = field-name ":" [ field-body ] CRLF
// field-name = 1*<any CHAR, excluding CTLs, SPACE, and ":">
var delim = line.IndexOf(MimeHeader.NameBodyDelimiter); // ':'
if (delim < 0) {
// ignore incorrect formed header
current = null;
continue;
}
var header = new MimeHeader(line.Substring(0, delim).TrimEnd().ToString(),
line.Substring(delim + 1).TrimStart().ToString());
headers.Add(header);
current = header;
}
}
return headers;
}
/// <summary>
/// Add Content type to the given header
/// </summary>
/// <param name="headers">headers to add content typ</param>
public void AddContentType(MimeHeaderCollection headers)
{
if (!headers.Contains("Content-Type") && _contentType != null)
{
MimeHeader mh = new MimeHeader("Content-Type", _contentType);
//if it is a text type, add the character set
if (_contentType.StartsWith("text/") || _contentType.StartsWith("application/vnd.cip4-j"))
{
mh.Parameters.Add(new MimeHeaderParam("charset", Mime.MimeCharsetToString(_charset)));
}
headers.Add(mh);
}
}
/// <summary>
/// This method checks and adds additional required header fields.
/// 1. If it is a text type, add the character set
/// 2. Check and add Content-Transfer-Encoding
/// 3. Calculates the content length. For base64 encoding, this
/// requires encoding the buffer. Therefore, the encoded data is stored in
/// _encodedString for use during the body right when base64 encoding is used.
/// </summary>
public void AddAdditionalHeader(MimeHeaderCollection headers)
{
//Add Content-Type
AddContentType(headers);
//Add Content-Transfer-Encoding
if (!headers.Contains("Content-Transfer-Encoding") && _encoding != MimeEncoding.E7Bit)
{
headers.Add(new MimeHeader("Content-Transfer-Encoding", Mime.MimeEncodingToString(_encoding)));
}
//Add Content-Disposition: attachment; filename="Job_10235.jdf"
if (!headers.Contains("Content-Disposition") && _fileName != null)
{
FileInfo fi = new FileInfo(_fileName);
MimeHeader mh = new MimeHeader("Content-Disposition", "attachment");
mh.Parameters.Add(new MimeHeaderParam("filename", fi.Name));
headers.Add(mh);
}
//Add Content-Length
if (_buffer != null)
{
int contentLength = 0;
if (_encoding == MimeEncoding.Base64)
{
if (EncodedString.Length % 76 > 0)
{
contentLength = EncodedString.Length / 76 * 2 + EncodedString.Length + 1;
}
else
{
contentLength = EncodedString.Length / 76 * 2 + EncodedString.Length;
}
}
else
{
_encodedString = null;
contentLength = _buffer.Length;
}
if (contentLength != 0)
{
if (!headers.Contains("Content-Length"))
{
headers.Add(new MimeHeader("Content-Length", contentLength.ToString()));
}
else
{
headers["Content-Length"].Value = contentLength.ToString();
}
}
}
}
/// <summary>
/// Parsing mime from stream
/// </summary>
/// <param name="mp"></param>
/// <param name="isChildMime"></param>
private void Parse(ref MimeParser mp, bool isChildMime)
{
try
{
string sLine = "";
byte [] buffer = null;
bool isEOC = false;
bool readBinaryBody = false;
//Read line by line
//if line is null, end of file is detected.
while(sLine != null)
{
if (isChildMime && _headers["content-type"] != null && _headers["content-type"].Value != "multipart/related")
{
readBinaryBody = true;
}
//Read next chunk
//Usually the next line except for reading binary body.
//Reading binary body will read until the boundary is found
MimeParser.ChunkType chunkType = mp.ReadNextChunk(ref sLine, ref isEOC, ref readBinaryBody, ref buffer);
//perform task based on the chunk type
switch (chunkType)
{
case MimeParser.ChunkType.VersionHeader:
case MimeParser.ChunkType.Header:
MimeHeader mh = new MimeHeader(sLine);
InitializeMultipart(ref mp, mh);
_headers.Add(mh);
break;
case MimeParser.ChunkType.Body:
CreateBody(sLine, buffer);
//Check if the next line is the boundary of this child mime
if (isChildMime && !_isMultiPart)
return;
break;
case MimeParser.ChunkType.StartBoundary:
case MimeParser.ChunkType.Boundary:
Mime childMessage = new Mime(ref mp, true);
_mimes.Add(childMessage);
break;
case MimeParser.ChunkType.EndBoundary:
return;
case MimeParser.ChunkType.EOF:
break;
default:
break;
}
}
}
catch(Exception err)
{
logger.Error(err);
throw;
}
}
private void InitializeMultipart(ref MimeParser mp, MimeHeader mh)
{
//Check Content-Type
if (mh.Name.ToLower().CompareTo("content-type") == 0
&& mh.Value.StartsWith("multipart"))
{
_isMultiPart = true;
mp.IsMultiPart = _isMultiPart;
//Check boundary
if (mh.Parameters["boundary"] != null)
{
_boundary = mh.Parameters["boundary"].Value;
mp.Boundary = _boundary;
}
}
}