private byte[] RetrieveContent(SHA1 id)
{
FileStream fs = new FileStream (GetObjectFullPath (id), FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader (fs);
byte[] bytes = new byte[(int) fs.Length];
fs.Read (bytes, 0, (int) fs.Length);
bytes = Decompress (bytes);
br.Close ();
fs.Close ();
return bytes;
}