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- /*
- * Copyright (c) Contributors, http://opensimulator.org/
- * See CONTRIBUTORS.TXT for a full list of copyright holders.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * * Neither the name of the OpenSim Project nor the
- * names of its contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- using System;
- using System.Collections;
- using System.Net;
- using libsecondlife;
- using libsecondlife.Packets;
- namespace OpenSim.Framework
- {
- public sealed class PacketPool
- {
- private static readonly PacketPool instance = new PacketPool();
- private Hashtable pool = new Hashtable();
- static PacketPool()
- {
- }
- public static PacketPool Instance
- {
- get { return instance; }
- }
- public static void EncodeProxyMessage(byte[] bytes, ref int numBytes, EndPoint trueEP)
- {
- if (numBytes > 4090) // max UPD size = 4096
- {
- throw new Exception("ERROR: No space to encode the proxy EP");
- }
- ushort port = (ushort) ((IPEndPoint) trueEP).Port;
- bytes[numBytes++] = (byte) (port % 256);
- bytes[numBytes++] = (byte) (port / 256);
- foreach (byte b in ((IPEndPoint) trueEP).Address.GetAddressBytes())
- {
- bytes[numBytes++] = b;
- }
- int x = numBytes;
- DecodeProxyMessage(bytes, ref numBytes);
- numBytes = x;
- }
- public static EndPoint DecodeProxyMessage(byte[] bytes, ref int numBytes)
- {
- // IPv4 Only
- byte[] addr = new byte[4];
- addr[3] = bytes[--numBytes];
- addr[2] = bytes[--numBytes];
- addr[1] = bytes[--numBytes];
- addr[0] = bytes[--numBytes];
- ushort port = (ushort) (bytes[--numBytes] * 256);
- port += (ushort) bytes[--numBytes];
- return (EndPoint) new IPEndPoint(new IPAddress(addr), (int) port);
- }
- public Packet GetPacket(PacketType type)
- {
- Packet packet;
- lock (pool)
- {
- if (pool[type] == null || ((Stack) pool[type]).Count == 0)
- {
- // Creating a new packet if we cannot reuse an old package
- packet = Packet.BuildPacket(type);
- }
- else
- {
- // Recycle old packages
- packet = (Packet) ((Stack) pool[type]).Pop();
- }
- }
- return packet;
- }
- // private byte[] decoded_header = new byte[10];
- private static PacketType GetType(byte[] bytes)
- {
- byte[] decoded_header = new byte[10 + 8];
- ushort id;
- PacketFrequency freq;
- Buffer.BlockCopy(bytes, 0, decoded_header, 0, 10);
- if ((bytes[0] & Helpers.MSG_ZEROCODED) != 0)
- {
- Helpers.ZeroDecodeCommand(bytes, decoded_header);
- }
- if (decoded_header[6] == 0xFF)
- {
- if (decoded_header[7] == 0xFF)
- {
- id = (ushort) ((decoded_header[8] << 8) + decoded_header[9]);
- freq = PacketFrequency.Low;
- }
- else
- {
- id = (ushort) decoded_header[7];
- freq = PacketFrequency.Medium;
- }
- }
- else
- {
- id = (ushort) decoded_header[6];
- freq = PacketFrequency.High;
- }
- return Packet.GetType(id, freq);
- }
- public Packet GetPacket(byte[] bytes, ref int packetEnd, byte[] zeroBuffer)
- {
- PacketType type = GetType(bytes);
- int i = 0;
- Packet packet = GetPacket(type);
- packet.FromBytes(bytes, ref i, ref packetEnd, zeroBuffer);
- return packet;
- }
- public void ReturnPacket(Packet packet)
- {
- return; // packet pool disabled
- /* // Commented out to remove a compiler warning. :)
- lock (pool)
- {
- PacketType type=packet.Type;
- if (pool[type] == null)
- {
- pool[type] = new Stack();
- }
- if (((Stack)pool[type]).Count < 50)
- {
- ((Stack)pool[type]).Push(packet);
- }
- }
- */
- }
- }
- }
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