/// <summary>
/// Parses mime entity from stream.
/// </summary>
/// <param name="stream">Data stream from where to read data.</param>
/// <param name="toBoundary">Entity data is readed to specified boundary.</param>
/// <returns>Returns false if last entity. Returns true for mulipart entity, if there are more entities.</returns>
internal bool Parse(SmartStream stream,string toBoundary)
{
// Clear header fields
m_pHeader.Clear();
m_pHeaderFieldCache.Clear();
// Parse header
m_pHeader.Parse(stream);
// Parse entity and child entities if any (Conent-Type: multipart/xxx...)
// Multipart entity
if((this.ContentType & MediaType_enum.Multipart) != 0){
// There must be be boundary ID (rfc 1341 7.2.1 The Content-Type field for multipart entities requires one parameter,
// "boundary", which is used to specify the encapsulation boundary.)
string boundaryID = this.ContentType_Boundary;
if(boundaryID == null){
// This is invalid message, just skip this mime entity
}
else{
// There is one or more mime entities
// Find first boundary start position
SmartStream.ReadLineAsyncOP args = new SmartStream.ReadLineAsyncOP(new byte[8000],SizeExceededAction.JunkAndThrowException);
stream.ReadLine(args,false);
if(args.Error != null){
throw args.Error;
}
string lineString = args.LineUtf8;
while(lineString != null){
if(lineString.StartsWith("--" + boundaryID)){
break;
}
stream.ReadLine(args,false);
if(args.Error != null){
throw args.Error;
}
lineString = args.LineUtf8;
}
// This is invalid entity, boundary start not found. Skip that entity.
if(string.IsNullOrEmpty(lineString)){
return false;
}
// Start parsing child entities of this entity
while(true){
// Parse and add child entity
MimeEntity childEntity = new MimeEntity();
this.ChildEntities.Add(childEntity);
// This is last entity, stop parsing
if(childEntity.Parse(stream,boundaryID) == false){
break;
}
// else{
// There are more entities, parse them
}
// This entity is child of mulipart entity.
// All this entity child entities are parsed,
// we need to move stream position to next entity start.
if(!string.IsNullOrEmpty(toBoundary)){
stream.ReadLine(args,false);
if(args.Error != null){
throw args.Error;
}
lineString = args.LineUtf8;
while(lineString != null){
if(lineString.StartsWith("--" + toBoundary)){
break;
}
stream.ReadLine(args,false);
if(args.Error != null){
throw args.Error;
}
lineString = args.LineUtf8;
}
// Invalid boundary end, there can't be more entities
if(string.IsNullOrEmpty(lineString)){
return false;
}
// See if last boundary or there is more. Last boundary ends with --
if(lineString.EndsWith(toBoundary + "--")){
return false;
}
// else{
// There are more entities
return true;
}
}
}
// Singlepart entity.
else{
// Boundary is specified, read data to specified boundary.
if(!string.IsNullOrEmpty(toBoundary)){
MemoryStream entityData = new MemoryStream();
SmartStream.ReadLineAsyncOP readLineOP = new SmartStream.ReadLineAsyncOP(new byte[32000],SizeExceededAction.JunkAndThrowException);
// Read entity data while get boundary end tag --boundaryID-- or EOS.
while(true){
stream.ReadLine(readLineOP,false);
if(readLineOP.Error != null){
throw readLineOP.Error;
}
// End of stream reached. Normally we should get boundary end tag --boundaryID--, but some x mailers won't add it, so
// if we reach EOS, consider boundary closed.
if(readLineOP.BytesInBuffer == 0){
// Just return data what was readed.
m_EncodedData = entityData.ToArray();
return false;
}
// We readed a line.
else{
// We have boundary start/end tag or just "--" at the beginning of line.
if(readLineOP.LineBytesInBuffer >= 2 && readLineOP.Buffer[0] == '-' && readLineOP.Buffer[1] == '-'){
string lineString = readLineOP.LineUtf8;
// We have boundary end tag, no more boundaries.
if(lineString == "--" + toBoundary + "--"){
m_EncodedData = entityData.ToArray();
return false;
}
// We have new boundary start.
else if(lineString == "--" + toBoundary){
m_EncodedData = entityData.ToArray();
return true;
}
else{
// Just skip
}
}
// Write readed line.
entityData.Write(readLineOP.Buffer,0,readLineOP.BytesInBuffer);
}
}
}
// Boundary isn't specified, read data to the stream end.
else{
MemoryStream ms = new MemoryStream();
stream.ReadAll(ms);
m_EncodedData = ms.ToArray();
}
}
return false;
}
/// <summary>
/// Parses header fields from stream. Stream position stays where header reading ends.
/// </summary>
/// <param name="stream">Stream from where to parse.</param>
public void Parse(SmartStream stream)
{
/* Rfc 2822 2.2 Header Fields
Header fields are lines composed of a field name, followed by a colon
(":"), followed by a field body, and terminated by CRLF. A field
name MUST be composed of printable US-ASCII characters (i.e.,
characters that have values between 33 and 126, inclusive), except
colon. A field body may be composed of any US-ASCII characters,
except for CR and LF. However, a field body may contain CRLF when
used in header "folding" and "unfolding" as described in section
2.2.3. All field bodies MUST conform to the syntax described in
sections 3 and 4 of this standard.
Rfc 2822 2.2.3 Long Header Fields
The process of moving from this folded multiple-line representation
of a header field to its single line representation is called
"unfolding". Unfolding is accomplished by simply removing any CRLF
that is immediately followed by WSP. Each header field should be
treated in its unfolded form for further syntactic and semantic
evaluation.
Example:
Subject: aaaaa<CRLF>
<TAB or SP>aaaaa<CRLF>
*/
m_pHeaderFields.Clear();
SmartStream.ReadLineAsyncOP args = new SmartStream.ReadLineAsyncOP(new byte[32000],SizeExceededAction.JunkAndThrowException);
stream.ReadLine(args,false);
if(args.Error != null){
throw args.Error;
}
string line = args.LineUtf8;
while(line != null){
// End of header reached
if(line == ""){
break;
}
// Store current header line and read next. We need to read 1 header line to ahead,
// because of multiline header fields.
string headerField = line;
stream.ReadLine(args,false);
if(args.Error != null){
throw args.Error;
}
line = args.LineUtf8;
// See if header field is multiline. See comment above.
while(line != null && (line.StartsWith("\t") || line.StartsWith(" "))){
headerField += line;
stream.ReadLine(args,false);
if(args.Error != null){
throw args.Error;
}
line = args.LineUtf8;
}
string[] name_value = headerField.Split(new char[]{':'},2);
// There must be header field name and value, otherwise invalid header field
if(name_value.Length == 2){
Add(name_value[0] + ":",name_value[1].Trim());
}
}
}
/// <summary>
/// Parses MIME header from the specified stream.
/// </summary>
/// <param name="stream">MIME header stream.</param>
/// <param name="encoding">Headers fields reading encoding. If not sure, UTF-8 is recommended.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>stream</b> or <b>encoding</b> is null.</exception>
public void Parse(SmartStream stream,Encoding encoding)
{
if(stream == null){
throw new ArgumentNullException("stream");
}
if(encoding == null){
throw new ArgumentNullException("encoding");
}
StringBuilder currentHeader = new StringBuilder();
SmartStream.ReadLineAsyncOP readLineOP = new SmartStream.ReadLineAsyncOP(new byte[32000],SizeExceededAction.ThrowException);
while(true){
stream.ReadLine(readLineOP,false);
if(readLineOP.Error != null){
throw readLineOP.Error;
}
// We reached end of stream.
else if(readLineOP.BytesInBuffer == 0){
if(currentHeader.Length > 0){
Add(currentHeader.ToString());
}
m_IsModified = false;
return;
}
// We got blank header terminator line.
else if(readLineOP.LineBytesInBuffer == 0){
if(currentHeader.Length > 0){
Add(currentHeader.ToString());
}
m_IsModified = false;
return;
}
else{
string line = encoding.GetString(readLineOP.Buffer,0,readLineOP.BytesInBuffer);
// New header field starts.
if(currentHeader.Length == 0){
currentHeader.Append(line);
}
// Header field continues.
else if(char.IsWhiteSpace(line[0])){
currentHeader.Append(line);
}
// Current header field closed, new starts.
else{
Add(currentHeader.ToString());
currentHeader = new StringBuilder();
currentHeader.Append(line);
}
}
}
}
