private void CopyType1Section(BsonStream inputStream, BsonStream outputStream)
{
var payloadType = (PayloadType)inputStream.ReadByte();
if (payloadType != PayloadType.Type1)
{
throw new FormatException("Expected subsequent sections to be of type 1.");
}
var sectionStartPosition = inputStream.Position;
var sectionSize = inputStream.ReadInt32();
var sectionEndPosition = sectionStartPosition + sectionSize;
var identifier = inputStream.ReadCString(Utf8Encodings.Lenient);
outputStream.WriteByte((byte)BsonType.Array);
outputStream.WriteCString(identifier);
var arrayStartPosition = outputStream.Position;
outputStream.WriteInt32(0); // array length will be backpatched
var index = 0;
while (inputStream.Position < sectionEndPosition)
{
outputStream.WriteByte((byte)BsonType.Document);
outputStream.WriteCString(index.ToString());
CopyBsonDocument(inputStream, outputStream);
index++;
}
outputStream.WriteByte(0);
outputStream.BackpatchSize(arrayStartPosition);
}
private long FindType0SectionPosition()
{
_stream.Position = _messageStartPosition;
var messageLength = _stream.ReadInt32();
_stream.Position = _messageStartPosition + 20;
var messageEndPosition = _messageStartPosition + messageLength;
while (_stream.Position < messageEndPosition)
{
var sectionPosition = _stream.Position;
var payloadType = (PayloadType)_stream.ReadByte();
if (payloadType == PayloadType.Type0)
{
return(sectionPosition);
}
else if (payloadType != PayloadType.Type1)
{
throw new FormatException($"Invalid payload type: {payloadType}.");
}
var sectionSize = _stream.ReadInt32();
_stream.Position = sectionPosition + 1 + sectionSize;
}
throw new InvalidOperationException("No type 0 section found.");
}
private void CopyType0Section(BsonStream inputStream, BsonStream outputStream)
{
var payloadType = (PayloadType)inputStream.ReadByte();
if (payloadType != PayloadType.Type0)
{
throw new FormatException("Expected first section to be of type 0.");
}
CopyBsonDocument(inputStream, outputStream);
}
