private void GetNextBatchFromCursor(bool hasMore)
{
if (!hasMore)
{
#pragma warning disable 618
throw new GridFSChunkException(_idAsBsonValue, _nextChunkNumber, "missing");
#pragma warning restore
}
var previousBatch = _batch;
_batch = _cursor.Current.ToList();
if (previousBatch != null)
{
_batchPosition += previousBatch.Count * FileInfo.ChunkSizeBytes;;
}
var lastChunkInBatch = _batch.Last();
if (lastChunkInBatch["n"].ToInt32() == _lastChunkNumber + 1 && lastChunkInBatch["data"].AsBsonBinaryData.Bytes.Length == 0)
{
_batch.RemoveAt(_batch.Count - 1);
}
foreach (var chunk in _batch)
{
var n = chunk["n"].ToInt32();
var bytes = chunk["data"].AsBsonBinaryData.Bytes;
if (n != _nextChunkNumber)
{
#pragma warning disable 618
throw new GridFSChunkException(_idAsBsonValue, _nextChunkNumber, "missing");
#pragma warning restore
}
_nextChunkNumber++;
var expectedChunkSize = n == _lastChunkNumber ? _lastChunkSize : FileInfo.ChunkSizeBytes;
if (bytes.Length != expectedChunkSize)
{
#pragma warning disable 618
throw new GridFSChunkException(_idAsBsonValue, _nextChunkNumber, "the wrong size");
#pragma warning restore
}
if (_checkMD5)
{
_md5.AppendData(bytes, 0, bytes.Length);
}
}
}
private IEnumerable <BsonDocument> CreateWriteBatchChunkDocuments()
{
var chunkDocuments = new List <BsonDocument>();
var n = (int)(_batchPosition / _chunkSizeBytes);
foreach (var chunk in _batch)
{
var chunkDocument = new BsonDocument
{
{ "_id", ObjectId.GenerateNewId() },
{ "files_id", _idAsBsonValue },
{ "n", n++ },
{ "data", new BsonBinaryData(chunk, BsonBinarySubType.Binary) }
};
chunkDocuments.Add(chunkDocument);
_batchPosition += chunk.Length;
_md5.AppendData(chunk, 0, chunk.Length);
}
return(chunkDocuments);
}
