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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.Net;
using System.Collections;
using libsecondlife.Packets;
namespace OpenSim.Framework
{
public sealed class PacketPool
{
static public 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;
}
static public 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);
}
// Set up a thread-safe singleton pattern
static PacketPool()
{
}
static readonly PacketPool instance = new PacketPool();
public static PacketPool Instance
{
get
{
return instance;
}
}
private Hashtable pool = new Hashtable();
public Packet GetPacket(PacketType type) {
Packet packet = null;
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 PacketType GetType(byte[] bytes)
{
byte[] decoded_header = new byte[10 + 8];
ushort id;
libsecondlife.PacketFrequency freq;
Buffer.BlockCopy(bytes, 0, decoded_header, 0, 10);
if((bytes[0] & libsecondlife.Helpers.MSG_ZEROCODED)!=0)
{
libsecondlife.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 = libsecondlife.PacketFrequency.Low;
}
else
{
id = (ushort)decoded_header[7];
freq = libsecondlife.PacketFrequency.Medium;
}
}
else
{
id = (ushort)decoded_header[6];
freq = libsecondlife.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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