/// <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 ((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 = 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();
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[Workaround.Definitions.MaxStreamLineLength],
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;
}