public byte[] Read(uint index)
{
if (index == 0 || index > this.data.Length - 1)
return Empty<byte>.Array;
int position = (int) index;
int length = (int) data.ReadCompressedUInt32 (ref position);
if (length > data.Length - position)
return Empty<byte>.Array;
var buffer = new byte [length];
Buffer.BlockCopy (data, position, buffer, 0, length);
return buffer;
}