internal static bool TrySplitMimePart(MimePartData<byte[]> part, Encoding encoding, out MultipartMimeData<MimePartData<byte[]>> multipart)
{
string boundary;
if (!part.TryGetMimeBoundary(out boundary))
{
multipart = null;
return false;
}
multipart = new MultipartMimeData<MimePartData<byte[]>>();
multipart.Headers.AddRange(part.Headers);
var body = part.Body;
ExceptionUtilities.CheckObjectNotNull(body, "Body cannot be null");
byte[] boundaryBytes = encoding.GetBytes(boundary);
byte[] newlineBytes = encoding.GetBytes("\r\n");
byte[] controlBytes = encoding.GetBytes("--");
while (EndsWithPattern(body, newlineBytes))
{
body = body.Take(body.Length - newlineBytes.Length).ToArray();
}
byte[] firstBoundaryBytes = controlBytes.Concat(boundaryBytes).Concat(newlineBytes).ToArray();
byte[] innerBoundaryBytes = newlineBytes.Concat(controlBytes).Concat(boundaryBytes).Concat(newlineBytes).ToArray();
byte[] finalBoundaryBytesWithoutFirstNewLine = controlBytes.Concat(boundaryBytes).Concat(controlBytes).ToArray();
byte[] finalBoundaryBytes = newlineBytes.Concat(finalBoundaryBytesWithoutFirstNewLine).ToArray();
int firstBoundaryStart = IndexOfPattern(body, firstBoundaryBytes, 0);
if (firstBoundaryStart == -1)
{
// Possibly an empty changeset - empty multipart can be represented as just the end boundary
int finalBoundaryStart = IndexOfPattern(body, finalBoundaryBytesWithoutFirstNewLine, 0);
ExceptionUtilities.Assert(finalBoundaryStart == 0, "Malformed");
ExceptionUtilities.Assert(EndsWithPattern(body, finalBoundaryBytesWithoutFirstNewLine), "Malformed");
return true;
}
ExceptionUtilities.Assert(firstBoundaryStart == 0, "Malformed");
ExceptionUtilities.Assert(EndsWithPattern(body, finalBoundaryBytes), "Malformed");
int currentBoundaryEnd = firstBoundaryStart + firstBoundaryBytes.Length;
while (currentBoundaryEnd < body.Length)
{
int nextBoundaryStart = IndexOfPattern(body, innerBoundaryBytes, currentBoundaryEnd);
int nextBoundaryEnd = nextBoundaryStart + innerBoundaryBytes.Length;
if (nextBoundaryStart < 0)
{
nextBoundaryStart = IndexOfPattern(body, finalBoundaryBytes, currentBoundaryEnd);
nextBoundaryEnd = nextBoundaryStart + finalBoundaryBytes.Length;
ExceptionUtilities.Assert(nextBoundaryStart != 0, "Malformed");
ExceptionUtilities.Assert(nextBoundaryStart + finalBoundaryBytes.Length == body.Length, "Malformed");
}
var fragment = body.Skip(currentBoundaryEnd).Take(nextBoundaryStart - currentBoundaryEnd).ToArray();
var subPart = new MimePartData<byte[]>();
if (fragment.Length > 0)
{
PopulateHeadersAndBody(subPart, fragment, encoding);
multipart.Add(subPart);
}
currentBoundaryEnd = nextBoundaryEnd;
}
return true;
}
internal static bool TrySplitMimePart(MimePartData <byte[]> part, Encoding encoding, out MultipartMimeData <MimePartData <byte[]> > multipart)
{
string boundary;
if (!part.TryGetMimeBoundary(out boundary))
{
multipart = null;
return(false);
}
multipart = new MultipartMimeData <MimePartData <byte[]> >();
multipart.Headers.AddRange(part.Headers);
var body = part.Body;
ExceptionUtilities.CheckObjectNotNull(body, "Body cannot be null");
byte[] boundaryBytes = encoding.GetBytes(boundary);
byte[] newlineBytes = encoding.GetBytes("\r\n");
byte[] controlBytes = encoding.GetBytes("--");
while (EndsWithPattern(body, newlineBytes))
{
body = body.Take(body.Length - newlineBytes.Length).ToArray();
}
byte[] firstBoundaryBytes = controlBytes.Concat(boundaryBytes).Concat(newlineBytes).ToArray();
byte[] innerBoundaryBytes = newlineBytes.Concat(controlBytes).Concat(boundaryBytes).Concat(newlineBytes).ToArray();
byte[] finalBoundaryBytesWithoutFirstNewLine = controlBytes.Concat(boundaryBytes).Concat(controlBytes).ToArray();
byte[] finalBoundaryBytes = newlineBytes.Concat(finalBoundaryBytesWithoutFirstNewLine).ToArray();
int firstBoundaryStart = IndexOfPattern(body, firstBoundaryBytes, 0);
if (firstBoundaryStart == -1)
{
// Possibly an empty changeset - empty multipart can be represented as just the end boundary
int finalBoundaryStart = IndexOfPattern(body, finalBoundaryBytesWithoutFirstNewLine, 0);
ExceptionUtilities.Assert(finalBoundaryStart == 0, "Malformed");
ExceptionUtilities.Assert(EndsWithPattern(body, finalBoundaryBytesWithoutFirstNewLine), "Malformed");
return(true);
}
ExceptionUtilities.Assert(firstBoundaryStart == 0, "Malformed");
ExceptionUtilities.Assert(EndsWithPattern(body, finalBoundaryBytes), "Malformed");
int currentBoundaryEnd = firstBoundaryStart + firstBoundaryBytes.Length;
while (currentBoundaryEnd < body.Length)
{
int nextBoundaryStart = IndexOfPattern(body, innerBoundaryBytes, currentBoundaryEnd);
int nextBoundaryEnd = nextBoundaryStart + innerBoundaryBytes.Length;
if (nextBoundaryStart < 0)
{
nextBoundaryStart = IndexOfPattern(body, finalBoundaryBytes, currentBoundaryEnd);
nextBoundaryEnd = nextBoundaryStart + finalBoundaryBytes.Length;
ExceptionUtilities.Assert(nextBoundaryStart != 0, "Malformed");
ExceptionUtilities.Assert(nextBoundaryStart + finalBoundaryBytes.Length == body.Length, "Malformed");
}
var fragment = body.Skip(currentBoundaryEnd).Take(nextBoundaryStart - currentBoundaryEnd).ToArray();
var subPart = new MimePartData <byte[]>();
if (fragment.Length > 0)
{
PopulateHeadersAndBody(subPart, fragment, encoding);
multipart.Add(subPart);
}
currentBoundaryEnd = nextBoundaryEnd;
}
return(true);
}
