BTDB.KVDBLayer.OnDiskMemoryMappedFileCollection.File.Reader.ReadBlock C# (CSharp) Method

                public override void ReadBlock(byte[] data, int offset, int length)
                {
                    if (length < Buf.Length)
                    {
                        base.ReadBlock(data, offset, length);
                        return;
                    }
                    var l = End - Pos;
                    Array.Copy(Buf, Pos, data, offset, l);
                    offset += l;
                    length -= l;
                    Pos += l;
                    if ((long)_valueSize - (long)_ofs < length)
                        throw new EndOfStreamException();
                    fixed (byte* dst = data)
                    {
                        CopyMemory(dst + offset, _owner._pointer + _ofs, length);
                    }
                    _ofs += (ulong)length;
                }