/// <summary>
/// Get the current content mapping header type for the current line
/// </summary>
/// <param name="line">The current message line.</param>
/// <param name="boundary">The boundary unique string for the current conten.</param>
/// <returns>The content mapping header type.</returns>
public static Nequeo.Net.Mail.MesssageContentMappingType GetContentMappingHeaderType(string line,
string boundary)
{
// Set the initial content mapping header typ the unknown.
Nequeo.Net.Mail.MesssageContentMappingType lineType = Nequeo.Net.Mail.MesssageContentMappingType.UnKnown;
// For each content mapping header type string.
for (int i = 0; i < EmailMessageParse.ContentMappingHeader.Length; i++)
{
// Get the current content mapping header type string.
string match = EmailMessageParse.ContentMappingHeader[i];
// Find a match in the current message line
// with the current content mapping haeder type.
if (Regex.Match(line, "^" + match + ":" + ".*$").Success)
{
// Cast the matching content mapping header type
// with the current array of content mapping header type.
// Break out of the loop.
lineType = (Nequeo.Net.Mail.MesssageContentMappingType)i;
break;
}
else
{
// If the current line is a start boundary unique string
// for body or attachment content mapping header type.
if (line.Equals("--" + boundary))
{
// Set the current content mapping header type
// to start of multipart boundary found, indicating that the
// message is a multipart message with a starting
// boundary unique string. Break out of the loop.
lineType = Nequeo.Net.Mail.MesssageContentMappingType.MultipartBoundaryFound;
break;
}
else
{
// If the current line is an end boundary unique string
// for body or attachment conrent mapping header type.
if (line.Equals("--" + boundary + "--"))
{
// Set the current content mapping header type
// to end of multipart boundary found. all the
// body or attachment data has been collected
// in a multipart messsage.
lineType = Nequeo.Net.Mail.MesssageContentMappingType.ComponentDone;
break;
}
}
}
// If the current line length is zero.
if (line.Length == 0)
{
// Set the content mapping header type to end
// of header and break out of the loop.
lineType = Nequeo.Net.Mail.MesssageContentMappingType.EndOfHeader;
break;
}
}
// Return the content mapping header type
// that was found.
return(lineType);
}
/// <summary>
/// Message body and attachment constructor.
/// </summary>
/// <param name="lines">The array of lines in the message.</param>
/// <param name="startOfBody">The start of the body data.</param>
/// <param name="multipartBoundary">The multipary boundary.</param>
/// <param name="mainContentType">The main content type.</param>
/// <param name="writeAttachmentToFile">Write to file.</param>
/// <param name="connection">The connection object.</param>
public MessageBody(string[] lines, long startOfBody, string multipartBoundary,
string mainContentType, bool writeAttachmentToFile, Pop3ConnectionAdapter connection)
{
// Get the number of message lines.
long stopOfBody = lines.Length;
// If the multipart boudary is null then
// only a body part exists.
if (multipartBoundary == null)
{
// Create a new string builder.
StringBuilder sbText = new StringBuilder();
// For each line in the message
// append the body lines.
for (long i = startOfBody; i < stopOfBody; i++)
{
sbText.Append(lines[i].Replace("\n", "").Replace("\r", ""));
}
// Add a new body to the component
// list store.
_component.Add(new MessageAttachment(mainContentType, sbText.ToString(),
writeAttachmentToFile, connection));
}
// Multipart boundary exists then a body and attachment
// exists in the message.
else
{
// Get the multipart boundary
// string in the message.
string boundary = multipartBoundary;
// Set as first component or body
// of the message to get.
bool firstComponent = true;
// Loop through whole of email message
// get the bodt all attachments.
for (long i = startOfBody; i < stopOfBody;)
{
bool boundaryFound = true;
string contentType = null;
string name = null;
string filename = null;
string contentTransferEncoding = null;
string contentDescription = null;
string contentDisposition = null;
string data = null;
// If the first component is to be added
// this is the body of a multipart message.
if (firstComponent)
{
boundaryFound = false;
firstComponent = false;
// For all the lines in the message.
while (i < stopOfBody)
{
// Get the current line in the message.
string line = lines[i].Replace("\n", "").Replace("\r", "");
// If the end of the body boundary
// has been found then exit the loop
// all body data has been found.
if (EmailMessageParse.GetContentMappingHeaderType(line, boundary)
== Nequeo.Net.Mail.MesssageContentMappingType.MultipartBoundaryFound)
{
boundaryFound = true;
++i;
break;
}
else
{
++i;
}
}
}
// Check to see whether multipart boundary
// was not found. This will indicate that
// the message data is corrupt.
if (!boundaryFound)
{
throw new Exception("Missing multipart boundary: " + boundary);
}
// Initalise the end of header indicator.
bool endOfHeader = false;
// Read all header information.
// For all other lines in the
// messsage.
while ((i < stopOfBody))
{
// Get the current line in the message.
string line = lines[i].Replace("\n", "").Replace("\r", "");
// Get the current content mapping type.
Nequeo.Net.Mail.MesssageContentMappingType lineType
= EmailMessageParse.GetContentMappingHeaderType(line, boundary);
// Get the mapping type.
switch (lineType)
{
case Nequeo.Net.Mail.MesssageContentMappingType.ContentType:
// Mapping type is content type header.
// Get the content type data.
contentType = EmailMessageParse.ContentType(line);
break;
case Nequeo.Net.Mail.MesssageContentMappingType.ContentTransferEncoding:
// Mapping type is content transfer encoding header.
// Get the content transfer encoding data.
contentTransferEncoding = EmailMessageParse.ContentTransferEncoding(line);
break;
case Nequeo.Net.Mail.MesssageContentMappingType.ContentDisposition:
// Mapping type is content disposition header.
// Get the content disposition data.
contentDisposition = EmailMessageParse.ContentDisposition(line);
break;
case Nequeo.Net.Mail.MesssageContentMappingType.ContentDescription:
// Mapping type is content description header.
// Get the content description data.
contentDescription = EmailMessageParse.ContentDescription(line);
break;
case Nequeo.Net.Mail.MesssageContentMappingType.EndOfHeader:
// End of header has been found.
endOfHeader = true;
break;
}
// Increment to the next line after
// find the content mapping type in
// the prevoius line.
++i;
// If end of header found then search
// for the next component starting point
// search for the next attachment. break
// out of the loop and end the process.
if (endOfHeader)
{
break;
}
else
{
// Read all header information.
// For all other lines in the
// messsage.
while (i < stopOfBody)
{
// If more lines to read for this line.
if (line.Substring(line.Length - 1, 1).Equals(";"))
{
// Get the current line in the message.
string nextLine = lines[i].Replace("\r", "").Replace("\n", "");
// Get the current attachment header type.
// interate through each attachment data.
switch (EmailMessageParse.GetAttachmenHeaderType(nextLine))
{
case Nequeo.Net.Mail.MesssageAttachmentType.Name:
// Attachment name header type.
// Get the attachment name in the message.
name = EmailMessageParse.Name(nextLine);
break;
case Nequeo.Net.Mail.MesssageAttachmentType.Filename:
// Attachment file nale header type.
// Get the attachment file name in the message.
filename = EmailMessageParse.Filename(nextLine);
break;
case Nequeo.Net.Mail.MesssageAttachmentType.EndOfHeader:
// End of header has been found.
endOfHeader = true;
break;
}
// If the end of the attachment
// data has not been found
if (!endOfHeader)
{
// Assign the current line to
// the next line
line = nextLine;
++i;
}
else
{
// End the loop.
break;
}
}
else
{
// End the loop.
break;
}
}
}
}
// Boundary found to false.
boundaryFound = false;
// Create a new string builder.
StringBuilder sbText = new StringBuilder();
// Initailise the emial composed indicator.
bool emailComposed = false;
// For each remaining line in
// the message store the body
// and the attachment.
while (i < stopOfBody)
{
// Get the current line in the message.
string line = lines[i].Replace("\n", "");
// If the end of the body boundary
// has been found then exit the loop
// all component data has been found.
if (EmailMessageParse.GetContentMappingHeaderType(line, boundary)
== Nequeo.Net.Mail.MesssageContentMappingType.MultipartBoundaryFound)
{
boundaryFound = true;
++i;
break;
}
// If the component is done then
// the email is composed, this
// component has been completed
// composed.
else if (EmailMessageParse.GetContentMappingHeaderType(line, boundary)
== Nequeo.Net.Mail.MesssageContentMappingType.ComponentDone)
{
emailComposed = true;
break;
}
// Add the current line of component
// data to the string builder.
// Move to the next line in the message.
sbText.Append(lines[i]);
++i;
}
// If data has been built
// then this is the component data
// that is body or attachment data.
if (sbText.Length > 0)
{
data = sbText.ToString();
}
// Add a new message body or attachment to the
// component list store.
_component.Add(new MessageAttachment(contentType, name, filename,
contentTransferEncoding, contentDescription, contentDisposition,
data, writeAttachmentToFile, connection));
// If all multiparts have been
// composed then exit break
// out of the loop.
if (emailComposed)
{
break;
}
}
}
}