NVorbis.Ogg.Packet.Reset C# (CSharp) Method

        internal void Reset()
        {
            _curOfs = 0;
            ResetBitReader();

            if (_mergedPacket != null)
            {
                _mergedPacket.Reset();
            }
        }

        internal int FindPacket(long granulePos, Func <DataPacket, DataPacket, DataPacket, int> packetGranuleCountCallback)
        {
            if (granulePos < 0L)
            {
                throw new ArgumentOutOfRangeException("granulePos");
            }
            while (this._last == null || this._last.PageGranulePosition < granulePos)
            {
                if (this._eosFound)
                {
                    if (this._first == null)
                    {
                        throw new InvalidDataException();
                    }
                    else
                    {
                        return(-1);
                    }
                }
                else
                {
                    this.GetMorePackets();
                }
            }
            Packet packet = this._last;

            if (packet.IsContinued)
            {
                packet = packet.Prev;
            }
            do
            {
                if (!packet.GranuleCount.HasValue)
                {
                    if (packet.Prev != null)
                    {
                        packet.Prev.Reset();
                    }
                    packet.Reset();
                    if (packet.Next != null)
                    {
                        packet.Next.Reset();
                    }
                    packet.GranuleCount = new long?((long)packetGranuleCountCallback((DataPacket)packet.Prev, (DataPacket)packet, (DataPacket)packet.Next));
                    if (packet == this._last || this._eosFound && packet == this._last.Prev || (packet.Next.IsContinued || packet.Next.PageSequenceNumber > packet.PageSequenceNumber))
                    {
                        if (packet.PageGranulePosition == -1L)
                        {
                            throw new InvalidDataException();
                        }
                        packet.GranulePosition = packet.PageGranulePosition;
                        if (packet == this._last && this._eosFound)
                        {
                            packet.GranuleCount = new long?(packet.PageGranulePosition - packet.Prev.PageGranulePosition);
                        }
                    }
                    else
                    {
                        packet.GranulePosition = packet.Next.GranulePosition - packet.Next.GranuleCount.Value;
                    }
                }
                if (packet.GranulePosition < granulePos)
                {
                    packet = packet.Next;
                    break;
                }
                else
                {
                    packet = packet.Prev;
                }
            }while (packet != null);
            if (packet == null)
            {
                return(-1);
            }
            int num = 0;

            while (packet.Prev != null)
            {
                packet = packet.Prev;
                ++num;
            }
            return(num);
        }