/// <summary>
/// Add a line to the decoder
/// </summary>
/// <param name="line">A string containing a message line</param>
/// <returns>The method return a positive value if the Attachment need more lines. Otherwise it return 0 to indicate the end of attachment body</returns>
public int AddLine(string line)
{
if (m_state == decoder_state.header)
{
if (line.TrimStart(' ') != "\r\n")
{
// store the line
m_headerBuilder.Append(line);
// check if there is field on the current line
int r = line.IndexOf(":");
if (r != -1 && line[0] != ' ' && line[0] != '\t')
{
// extract header field and value
string field_name = line.Substring(0, r);
string field_value = line.Substring(r + 1);
// store header
m_headers.Add(field_name, field_value);
// store last field name
m_last_field = field_name;
}
else if (m_last_field != null)
{
m_headers[m_last_field] += line;
}
}
else
{
// initialize next state
m_state = decoder_state.body;
// iniitialize body decodig
m_bodyBuilder = new StringBuilder();
// store headers
m_header = m_headerBuilder.ToString();
m_headerBuilder.Length = 0;
m_headerBuilder = null;
// check multipart value
if (IsMultipart())
{
m_multipart = true;
m_boundary = HeaderBoundary();
}
}
}
else if (m_state == decoder_state.body)
{
if (line.IndexOf(m_boundary) != -1 && Multipart)
{
// start a new attachment
m_state = decoder_state.attachment;
m_last_attachment = new MimeAttachment();
m_last_attachment.AddLine(line);
m_body = m_bodyBuilder.ToString();
m_bodyBuilder = null;
}
else
{
m_bodyBuilder.Append(line);
}
}
else if (m_state == decoder_state.attachment)
{
if (m_last_attachment != null)
{
if (line.IndexOf(m_boundary) != -1)
{
// attachement end
m_last_attachment.CheckAttachmentEnd();
if (m_last_attachment.Headers.Count > 0)
{
m_attachments.Add(m_last_attachment);
}
m_last_attachment = new MimeAttachment();
m_last_attachment.AddLine(line);
}
else
{
m_last_attachment.AddLine(line);
}
}
else
{
if (line.IndexOf(m_boundary) != -1)
{
m_last_attachment = new MimeAttachment();
m_last_attachment.AddLine(line);
}
}
}
return(1);
}
/// <summary>
/// Add a message line to the decoder
/// </summary>
/// <param name="line">A string containing a message line</param>
public void AddLine(string line)
{
m_lines_treated++; // one line more
if (m_state == decoder_state.header)
{
if (line != "\r\n")
{
if (m_headerBuilder == null)
{
m_headerBuilder = new StringBuilder();
}
m_headerBuilder.Append(line);
int r = line.IndexOf(":");
if (r != -1 && line[0] != ' ' && line[0] != '\t')
{
string field_name = line.Substring(0, r);
string field_value = line.Substring(r + 1);
AddHeader(field_name, field_value);
m_last_field = field_name;
}
else if (m_last_field != null)
{
m_headers[m_last_field] += line;
}
}
else
{
// decode header
m_header = m_headerBuilder.ToString();
m_headerBuilder = null;
m_boundary = HeaderBoundary();
m_multipart = IsMultipart();
m_state = decoder_state.body;
m_bodyBuilder = new StringBuilder();
}
}
else if (m_state == decoder_state.body)
{
if (line != "\r\n")
{
if (line.IndexOf(m_boundary) != -1 && m_multipart)
{
// end last attachment
if (m_last_attachment != null)
{
m_last_attachment.CheckAttachmentEnd();
if (m_last_attachment.Body.Length > 0 ||
m_last_attachment.Attachments.Count > 0 ||
m_last_attachment.Header.Length > 0)
{
m_attachments.Add(m_last_attachment);
m_last_attachment = null;
}
}
// start a new attachment
m_state = decoder_state.attachment;
m_body = m_bodyBuilder.ToString();
m_bodyBuilder.Length = 0;
m_bodyBuilder = null;
m_last_attachment = new MimeAttachment();
m_last_attachment.AddLine(line);
}
else
{
m_bodyBuilder.Append(line); // append the line to the message body
}
}
}
else if (m_state == decoder_state.attachment)
{
if (m_last_attachment != null)
{
if (line.IndexOf(m_boundary) != -1)
{
// attachement end
m_last_attachment.CheckAttachmentEnd();
if (m_last_attachment.Header.Length > 0 ||
m_last_attachment.Body.Length > 0 ||
m_last_attachment.Attachments.Count > 0)
{
m_attachments.Add(m_last_attachment);
}
//m_attachments.Add (m_last_attachment);
m_last_attachment = new MimeAttachment();
m_last_attachment.AddLine(line);
}
else
{
m_last_attachment.AddLine(line); // append the line to current attachment
}
}
else
{
if (line.IndexOf(m_boundary) != -1)
{
m_last_attachment = new MimeAttachment();
m_last_attachment.AddLine(line);
}
}
}
}
/// <summary>
/// Default constructor
/// </summary>
public MimeAttachment()
{
m_state = decoder_state.header;
m_multipart = false;
}
