Reverting the deletion of files related to texture sending until we figure out exactly what is and isn't needed

OpenSim/Region/CoreModules/Agent/TextureSender/TextureSender.cs

@@ -0,0 +1,212 @@
+/*
+ * 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 OpenSimulator 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.Reflection;
+using log4net;
+using OpenSim.Framework;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.CoreModules.Agent.TextureSender
+{
+    /// <summary>
+    /// A TextureSender handles the process of receiving a texture requested by the client from the
+    /// AssetCache, and then sending that texture back to the client.
+    /// </summary>
+    public class TextureSender : ITextureSender
+    {
+        private static readonly ILog m_log
+            = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        /// <summary>
+        /// Records the number of times texture send has been called.
+        /// </summary>
+        public int counter = 0;
+
+        public bool ImageLoaded = false;
+
+        /// <summary>
+        /// Holds the texture asset to send.
+        /// </summary>
+        private AssetBase m_asset;
+
+        //public UUID assetID { get { return m_asset.FullID; } }
+
+        // private bool m_cancel = false;
+
+        // See ITextureSender
+
+        // private bool m_sending = false;
+
+        /// <summary>
+        /// This is actually the number of extra packets required to send the texture data!  We always assume
+        /// at least one is required.
+        /// </summary>
+        private int NumPackets = 0;
+
+        /// <summary>
+        /// Holds the packet number to send next.  In this case, each packet is 1000 bytes long and starts
+        /// at the 600th byte (0th indexed).
+        /// </summary>
+        private int PacketCounter = 0;
+
+        private int RequestedDiscardLevel = -1;
+        private IClientAPI RequestUser;
+        private uint StartPacketNumber = 0;
+
+        public TextureSender(IClientAPI client, int discardLevel, uint packetNumber)
+        {
+            RequestUser = client;
+            RequestedDiscardLevel = discardLevel;
+            StartPacketNumber = packetNumber;
+        }
+
+        #region ITextureSender Members
+
+        public bool Cancel
+        {
+            get { return false; }
+            set
+            {
+                // m_cancel = value;
+            }
+        }
+
+        public bool Sending
+        {
+            get { return false; }
+            set
+            {
+                // m_sending = value;
+            }
+        }
+
+        // See ITextureSender
+        public void UpdateRequest(int discardLevel, uint packetNumber)
+        {
+            RequestedDiscardLevel = discardLevel;
+            StartPacketNumber = packetNumber;
+            PacketCounter = (int)StartPacketNumber;
+        }
+
+        // See ITextureSender
+        public bool SendTexturePacket()
+        {
+            //m_log.DebugFormat("[TEXTURE SENDER]: Sending packet for {0}", m_asset.FullID);
+
+            SendPacket();
+            counter++;
+            if ((NumPackets == 0) || (RequestedDiscardLevel == -1) || (PacketCounter > NumPackets) ||
+                ((RequestedDiscardLevel > 0) && (counter > 50 + (NumPackets / (RequestedDiscardLevel + 1)))))
+            {
+                return true;
+            }
+            return false;
+        }
+
+        #endregion
+
+        /// <summary>
+        /// Load up the texture data to send.
+        /// </summary>
+        /// <param name="asset"></param>
+        public void TextureReceived(AssetBase asset)
+        {
+            m_asset = asset;
+            NumPackets = CalculateNumPackets(asset.Data.Length);
+            PacketCounter = (int)StartPacketNumber;
+            ImageLoaded = true;
+        }
+
+        /// <summary>
+        /// Sends a texture packet to the client.
+        /// </summary>
+        private void SendPacket()
+        {
+            if (PacketCounter <= NumPackets)
+            {
+                if (PacketCounter == 0)
+                {
+                    if (NumPackets == 0)
+                    {
+                        RequestUser.SendImageFirstPart(1, m_asset.FullID, (uint)m_asset.Data.Length, m_asset.Data, 2);
+                        PacketCounter++;
+                    }
+                    else
+                    {
+                        byte[] ImageData1 = new byte[600];
+                        Array.Copy(m_asset.Data, 0, ImageData1, 0, 600);
+
+                        RequestUser.SendImageFirstPart(
+                            (ushort)(NumPackets), m_asset.FullID, (uint)m_asset.Data.Length, ImageData1, 2);
+                        PacketCounter++;
+                    }
+                }
+                else
+                {
+                    int size = m_asset.Data.Length - 600 - (1000 * (PacketCounter - 1));
+                    if (size > 1000) size = 1000;
+                    byte[] imageData = new byte[size];
+                    try
+                    {
+                        Array.Copy(m_asset.Data, 600 + (1000 * (PacketCounter - 1)), imageData, 0, size);
+                    }
+                    catch (ArgumentOutOfRangeException)
+                    {
+                        m_log.Error("[TEXTURE SENDER]: Unable to separate texture into multiple packets: Array bounds failure on asset:" +
+                                    m_asset.ID);
+                        return;
+                    }
+
+                    RequestUser.SendImageNextPart((ushort)PacketCounter, m_asset.FullID, imageData);
+                    PacketCounter++;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Calculate the number of packets that will be required to send the texture loaded into this sender
+        /// This is actually the number of 1000 byte packets not including an initial 600 byte packet...
+        /// </summary>
+        /// <param name="length"></param>
+        /// <returns></returns>
+        private int CalculateNumPackets(int length)
+        {
+            int numPackets = 0;
+
+            if (length > 600)
+            {
+                //over 600 bytes so split up file
+                int restData = (length - 600);
+                int restPackets = ((restData + 999) / 1000);
+                numPackets = restPackets;
+            }
+
+            return numPackets;
+        }
+    }
+}