public static Chunk CreateNew(Oid fileId, int number, byte[] data)
{
OidGenerator generator = new OidGenerator();
Chunk chunk = new Chunk();
chunk.Oid = generator.Generate();
chunk.Data = data;
chunk.FileID = fileId;
chunk.Number = number;
return chunk;
}
public static Chunk CreateFromDocument(Document document)
{
if (document != null && document.Contains("files_id") && document.Contains("data") && document.Contains("n"))
{
Chunk chunk = new Chunk();
chunk.Oid = (MongoDB.Driver.Oid)document["_id"];
chunk.FileID = (MongoDB.Driver.Oid)document["files_id"];
chunk.Number = Convert.ToInt32(document["n"]);
chunk.Data = (byte[])document["data"];
return chunk;
}
else
{
throw new ArgumentException("Documento non valido per creare un Chunk");
}
}
private void ChunkFile(byte[] data, string mongoname, bool overwrite, string contentType)
{
if (string.IsNullOrEmpty(contentType))
{
contentType = "file/undef";
if (mongoname.LastIndexOf('.') > 0)
{
contentType = "file/" + mongoname.Substring(mongoname.LastIndexOf('.') + 1);
}
}
_chunksDocument.Clear();
System.Security.Cryptography.MD5 sscMD5 = System.Security.Cryptography.MD5.Create();
Document file = null;
bool closeConnection = false;
try
{
if (this.mongo.Connection.State != ConnectionState.Opened)
{
this.mongo.Connection.Open();
closeConnection = true;
}
file = files.FindOne(this.FileDocument);
if (file != null)
{
if (overwrite)
{
file["length"] = data.Length;
file["contentType"] = contentType;
file["uploadDate"] = DateTime.Now;
file["chunkSize"] = this.ChunkSize;
byte[] mHash = sscMD5.ComputeHash(data);
file["md5"] = Convert.ToBase64String(mHash);
files.Update(file);
Document eraser = new Document();
eraser.Add("files_id", file["_id"]);
foreach (Document erased in chunks.Find(eraser).Documents)
{
chunks.Delete(erased);
}
if (data.Length <= this.ChunkSize)
{
Chunk chunk = new Chunk();
chunk.FileID = this.Oid;
chunk.Number = 0;
chunk.Data = data;
_chunksDocument.Add(chunk);
}
else
{
int chucksNumbers = data.Length / this.ChunkSize + (data.Length % this.ChunkSize > 0 ? 1 : 0);
for (int i = 0; i < chucksNumbers; i++)
{
byte[] buffer = new byte[i < chucksNumbers - 1 ? this.ChunkSize : data.Length % this.ChunkSize];
Array.Copy(data, i * this.ChunkSize, buffer, 0, buffer.Length);
Chunk chunk = new Chunk();
chunk.FileID = this.Oid;
chunk.Number = i;
chunk.Data = buffer;
_chunksDocument.Add(chunk);
}
}
}
else
{
throw new Exception("Il file '" + file["filename"] + " esiste nella collection '" + this.files.FullName + "'");
}
}
else
{
file = new Document();
OidGenerator oidg = new OidGenerator();
file.Add("_id", oidg.Generate());
file.Add("contentType", contentType);
file.Add("length", data.Length);
file.Add("chunkSize", DEFAULT_CHUNKSIZE);
file.Add("uploadDate", DateTime.Now);
byte[] mHash = sscMD5.ComputeHash(data);
file.Add("md5", Convert.ToBase64String(mHash));
files.Insert(file);
if (data.Length <= this.ChunkSize)
{
Chunk chunk = new Chunk();
chunk.FileID = this.Oid;
chunk.Number = 0;
chunk.Data = data;
_chunksDocument.Add(chunk);
}
else
{
int chucksNumbers = data.Length / this.ChunkSize + (data.Length % this.ChunkSize > 0 ? 1 : 0);
for (int i = 0; i < chucksNumbers; i++)
{
byte[] buffer = new byte[i < chucksNumbers - 1 ? this.ChunkSize : data.Length % this.ChunkSize];
Array.Copy(data, i * this.ChunkSize, buffer, 0, buffer.Length);
Chunk chunk = new Chunk();
chunk.FileID = this.Oid;
chunk.Number = i;
chunk.Data = buffer;
_chunksDocument.Add(chunk);
}
}
}
this.CreateIndex();
foreach (Chunk c in _chunksDocument)
{
chunks.Insert(c.Document);
}
this.FileDocument = file;
}
catch (Exception)
{
throw;
}
finally
{
if (closeConnection)
{
this.mongo.Connection.Close();
}
}
}
