async Task MultipartScanSubpartsAsync(Multipart multipart, int depth, CancellationToken cancellationToken)
{
//var beginOffset = GetOffset (inputIndex);
do
{
//OnMultipartBoundaryBegin (multipart, beginOffset);
// skip over the boundary marker
if (!await SkipLineAsync(true, cancellationToken).ConfigureAwait(false))
{
//OnMultipartBoundaryEnd (multipart, GetOffset (inputIndex));
boundary = BoundaryType.Eos;
return;
}
//OnMultipartBoundaryEnd (multipart, GetOffset (inputIndex));
var beginLineNumber = lineNumber;
// parse the headers
state = MimeParserState.Headers;
if (await StepAsync(cancellationToken).ConfigureAwait(false) == MimeParserState.Error)
{
boundary = BoundaryType.Eos;
return;
}
if (state == MimeParserState.Boundary)
{
if (headers.Count == 0)
{
if (boundary == BoundaryType.ImmediateBoundary)
{
//beginOffset = GetOffset (inputIndex);
continue;
}
return;
}
// This part has no content, but that will be handled in ConstructMultipartAsync()
// or ConstructMimePartAsync().
}
//if (state == ParserState.Complete && headers.Count == 0)
// return BoundaryType.EndBoundary;
var type = GetContentType(multipart.ContentType);
var entity = options.CreateEntity(type, headers, false, depth);
var entityArgs = new MimeEntityEndEventArgs(entity, multipart)
{
HeadersEndOffset = headerBlockEnd,
BeginOffset = headerBlockBegin,
LineNumber = beginLineNumber
};
OnMimeEntityBegin(entityArgs);
if (entity is Multipart)
{
await ConstructMultipartAsync((Multipart)entity, entityArgs, depth + 1, cancellationToken).ConfigureAwait(false);
}
else if (entity is MessagePart)
{
await ConstructMessagePartAsync((MessagePart)entity, entityArgs, depth + 1, cancellationToken).ConfigureAwait(false);
}
else
{
await ConstructMimePartAsync((MimePart)entity, entityArgs, cancellationToken).ConfigureAwait(false);
}
var endOffset = GetEndOffset(inputIndex);
entityArgs.HeadersEndOffset = Math.Min(entityArgs.HeadersEndOffset, endOffset);
entityArgs.EndOffset = endOffset;
OnMimeEntityEnd(entityArgs);
//beginOffset = endOffset;
multipart.Add(entity);
} while (boundary == BoundaryType.ImmediateBoundary);
}
async Task ConstructMultipartAsync(Multipart multipart, MimeEntityEndEventArgs args, int depth, CancellationToken cancellationToken)
{
var beginOffset = GetOffset(inputIndex);
var beginLineNumber = lineNumber;
var marker = multipart.Boundary;
long endOffset;
if (marker == null)
{
#if DEBUG
Debug.WriteLine("Multipart without a boundary encountered!");
#endif
// Note: this will scan all content into the preamble...
await MultipartScanPreambleAsync(multipart, cancellationToken).ConfigureAwait(false);
endOffset = GetEndOffset(inputIndex);
args.Lines = GetLineCount(beginLineNumber, beginOffset, endOffset);
return;
}
PushBoundary(marker);
await MultipartScanPreambleAsync(multipart, cancellationToken).ConfigureAwait(false);
if (boundary == BoundaryType.ImmediateBoundary)
{
await MultipartScanSubpartsAsync(multipart, depth, cancellationToken).ConfigureAwait(false);
}
if (boundary == BoundaryType.ImmediateEndBoundary)
{
//OnMultipartEndBoundaryBegin (multipart, GetEndOffset (inputIndex));
// consume the end boundary and read the epilogue (if there is one)
multipart.WriteEndBoundary = true;
await SkipLineAsync(false, cancellationToken).ConfigureAwait(false);
PopBoundary();
//OnMultipartEndBoundaryEnd (multipart, GetOffset (inputIndex));
await MultipartScanEpilogueAsync(multipart, cancellationToken).ConfigureAwait(false);
endOffset = GetEndOffset(inputIndex);
args.Lines = GetLineCount(beginLineNumber, beginOffset, endOffset);
return;
}
endOffset = GetEndOffset(inputIndex);
args.Lines = GetLineCount(beginLineNumber, beginOffset, endOffset);
multipart.WriteEndBoundary = false;
// We either found the end of the stream or we found a parent's boundary
PopBoundary();
unsafe
{
fixed(byte *inbuf = input)
{
if (boundary == BoundaryType.ParentEndBoundary && FoundImmediateBoundary(inbuf, true))
{
boundary = BoundaryType.ImmediateEndBoundary;
}
else if (boundary == BoundaryType.ParentBoundary && FoundImmediateBoundary(inbuf, false))
{
boundary = BoundaryType.ImmediateBoundary;
}
}
}
}
async Task ConstructMessagePartAsync(MessagePart rfc822, MimeEntityEndEventArgs args, int depth, CancellationToken cancellationToken)
{
var beginOffset = GetOffset(inputIndex);
var beginLineNumber = lineNumber;
if (bounds.Count > 0)
{
int atleast = Math.Max(ReadAheadSize, GetMaxBoundaryLength());
if (await ReadAheadAsync(atleast, 0, cancellationToken).ConfigureAwait(false) <= 0)
{
boundary = BoundaryType.Eos;
return;
}
unsafe
{
fixed(byte *inbuf = input)
{
byte *start = inbuf + inputIndex;
byte *inend = inbuf + inputEnd;
byte *inptr = start;
*inend = (byte)'\n';
while (*inptr != (byte)'\n')
{
inptr++;
}
boundary = CheckBoundary(inputIndex, start, (int)(inptr - start));
switch (boundary)
{
case BoundaryType.ImmediateEndBoundary:
case BoundaryType.ImmediateBoundary:
case BoundaryType.ParentBoundary:
return;
case BoundaryType.ParentEndBoundary:
// ignore "From " boundaries, broken mailers tend to include these...
if (!IsMboxMarker(start))
{
return;
}
break;
}
}
}
}
// parse the headers...
state = MimeParserState.MessageHeaders;
if (await StepAsync(cancellationToken).ConfigureAwait(false) == MimeParserState.Error)
{
// Note: this either means that StepHeaders() found the end of the stream
// or an invalid header field name at the start of the message headers,
// which likely means that this is not a valid MIME stream?
boundary = BoundaryType.Eos;
return;
}
var message = new MimeMessage(options, headers, RfcComplianceMode.Loose);
var messageArgs = new MimeMessageEndEventArgs(message, rfc822)
{
HeadersEndOffset = headerBlockEnd,
BeginOffset = headerBlockBegin,
LineNumber = beginLineNumber
};
OnMimeMessageBegin(messageArgs);
if (preHeaderBuffer.Length > 0)
{
message.MboxMarker = new byte[preHeaderLength];
Buffer.BlockCopy(preHeaderBuffer, 0, message.MboxMarker, 0, preHeaderLength);
}
var type = GetContentType(null);
var entity = options.CreateEntity(type, headers, true, depth);
var entityArgs = new MimeEntityEndEventArgs(entity)
{
HeadersEndOffset = headerBlockEnd,
BeginOffset = headerBlockBegin,
LineNumber = beginLineNumber
};
OnMimeEntityBegin(entityArgs);
message.Body = entity;
if (entity is Multipart)
{
await ConstructMultipartAsync((Multipart)entity, entityArgs, depth + 1, cancellationToken).ConfigureAwait(false);
}
else if (entity is MessagePart)
{
await ConstructMessagePartAsync((MessagePart)entity, entityArgs, depth + 1, cancellationToken).ConfigureAwait(false);
}
else
{
await ConstructMimePartAsync((MimePart)entity, entityArgs, cancellationToken).ConfigureAwait(false);
}
rfc822.Message = message;
var endOffset = GetEndOffset(inputIndex);
messageArgs.HeadersEndOffset = entityArgs.HeadersEndOffset = Math.Min(entityArgs.HeadersEndOffset, endOffset);
messageArgs.EndOffset = entityArgs.EndOffset = endOffset;
OnMimeEntityEnd(entityArgs);
OnMimeMessageEnd(messageArgs);
args.Lines = GetLineCount(beginLineNumber, beginOffset, endOffset);
}