/// <summary>
/// Decodes the attachment data from a mime encoded type.
/// </summary>
/// <param name="writeAttachmentToFile">Write the attachment indicator.</param>
private void DecodeData(bool writeAttachmentToFile)
{
// If the data is an attachemnt.
if (_contentDisposition != null)
{
// If the attachment is encoded as BASE-64
// then decode the data from base 64.
if ((_contentDisposition.Equals("attachment;")) &&
(_contentTransferEncoding.ToUpper().Equals("BASE64")))
{
// Convert the attachment data to a byte array
// from the base 64 encoding. Assign the decoded
// data to the byte array of the raw file.
_binaryData = Convert.FromBase64String(_data.Replace("\n", ""));
_file = _binaryData;
_decoded = true;
// If write the attachment set then
// directly write the attachment
// to the specified file.
if (writeAttachmentToFile)
{
EmailMessageParse.WriteAttachment(_binaryData,
_connection.AttachmentDirectory, _filename);
}
}
// If the attachment is encoded as QUOTED-PRINTABLE
// then decode the data from quoted printable.
else if ((_contentDisposition.Equals("attachment;")) &&
(_contentTransferEncoding.ToUpper().Equals("QUOTED-PRINTABLE")))
{
// Convert the attachment data to a byte array
// from the quoted printable encoding. Assign the decoded
// data to the byte array of the raw file.
string output = EmailMessageParse.FromQuotedPrintable(_data);
_file = Encoding.ASCII.GetBytes(output);
_decoded = true;
// If write the attachment set then
// directly write the attachment
// to the specified file.
if (writeAttachmentToFile)
{
EmailMessageParse.WriteQuotedPrintable(output,
_connection.AttachmentDirectory, _filename);
}
}
// If the attachment has been encoded with
// some other transfer encoding then assign
// the raw encoded data.
else if (_contentDisposition.Equals("attachment;"))
{
_file = Encoding.ASCII.GetBytes(_data);
_decoded = false;
}
}
}
/// <summary>
/// Write the attachment to the file path.
/// </summary>
/// <param name="directoryPath">The directory path to write the file.</param>
/// <param name="fileName">The name of the file to write.</param>
/// <returns>True if the attachment was written else false.</returns>
public bool WriteAttachment(string directoryPath, string fileName)
{
try
{
// Write the current attachment
// to the specified file.
EmailMessageParse.WriteAttachment(_file,
directoryPath, fileName);
return(true);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
