1 files changed, 401 insertions, 0 deletions

diff --git a/OpenSim/Region/ClientStack/Linden/UDP/J2KImage.cs b/OpenSim/Region/ClientStack/Linden/UDP/J2KImage.cs
new file mode 100644
index 0000000..9dd6663
--- /dev/null
+++ b/OpenSim/Region/ClientStack/Linden/UDP/J2KImage.cs
@@ -0,0 +1,401 @@
+/*
+ * 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.Collections.Generic;
+using OpenMetaverse;
+using OpenMetaverse.Imaging;
+using OpenSim.Framework;
+using OpenSim.Region.Framework.Interfaces;
+using OpenSim.Services.Interfaces;
+using log4net;
+using System.Reflection;
+
+namespace OpenSim.Region.ClientStack.LindenUDP
+{
+    /// <summary>
+    /// Stores information about a current texture download and a reference to the texture asset
+    /// </summary>
+    public class J2KImage
+    {
+        private const int IMAGE_PACKET_SIZE = 1000;
+        private const int FIRST_PACKET_SIZE = 600;
+
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        public uint LastSequence;
+        public float Priority;
+        public uint StartPacket;
+        public sbyte DiscardLevel;
+        public UUID TextureID;
+        public IJ2KDecoder J2KDecoder;
+        public IAssetService AssetService;
+        public UUID AgentID;
+        public IInventoryAccessModule InventoryAccessModule;
+        public OpenJPEG.J2KLayerInfo[] Layers;
+        public bool IsDecoded;
+        public bool HasAsset;
+        public C5.IPriorityQueueHandle<J2KImage> PriorityQueueHandle;
+
+        private uint m_currentPacket;
+        private bool m_decodeRequested;
+        private bool m_assetRequested;
+        private bool m_sentInfo;
+        private uint m_stopPacket;
+        private byte[] m_asset;
+        private LLImageManager m_imageManager;
+
+        public J2KImage(LLImageManager imageManager)
+        {
+            m_imageManager = imageManager;
+        }
+
+        /// <summary>
+        /// Sends packets for this texture to a client until packetsToSend is 
+        /// hit or the transfer completes
+        /// </summary>
+        /// <param name="client">Reference to the client that the packets are destined for</param>
+        /// <param name="packetsToSend">Maximum number of packets to send during this call</param>
+        /// <param name="packetsSent">Number of packets sent during this call</param>
+        /// <returns>True if the transfer completes at the current discard level, otherwise false</returns>
+        public bool SendPackets(LLClientView client, int packetsToSend, out int packetsSent)
+        {
+            packetsSent = 0;
+
+            if (m_currentPacket <= m_stopPacket)
+            {
+                bool sendMore = true;
+
+                if (!m_sentInfo || (m_currentPacket == 0))
+                {
+                    sendMore = !SendFirstPacket(client);
+
+                    m_sentInfo = true;
+                    ++m_currentPacket;
+                    ++packetsSent;
+                }
+                if (m_currentPacket < 2)
+                {
+                    m_currentPacket = 2;
+                }
+                
+                while (sendMore && packetsSent < packetsToSend && m_currentPacket <= m_stopPacket)
+                {
+                    sendMore = SendPacket(client);
+                    ++m_currentPacket;
+                    ++packetsSent;
+                }
+            }
+
+            return (m_currentPacket > m_stopPacket);
+        }
+
+        public void RunUpdate()
+        {
+            //This is where we decide what we need to update
+            //and assign the real discardLevel and packetNumber
+            //assuming of course that the connected client might be bonkers
+
+            if (!HasAsset)
+            {
+                if (!m_assetRequested)
+                {
+                    m_assetRequested = true;
+                    AssetService.Get(TextureID.ToString(), this, AssetReceived);
+                }
+            }
+            else
+            {
+                if (!IsDecoded)
+                {
+                    //We need to decode the requested image first
+                    if (!m_decodeRequested)
+                    {
+                        //Request decode
+                        m_decodeRequested = true;
+                        // Do we have a jpeg decoder?
+                        if (J2KDecoder != null)
+                        {
+                            if (m_asset == null)
+                            {
+                                J2KDecodedCallback(TextureID, new OpenJPEG.J2KLayerInfo[0]);
+                            }
+                            else
+                            {
+                                // Send it off to the jpeg decoder
+                                J2KDecoder.BeginDecode(TextureID, m_asset, J2KDecodedCallback);
+                            }
+
+                        }
+                        else
+                        {
+                            J2KDecodedCallback(TextureID, new OpenJPEG.J2KLayerInfo[0]);
+                        }
+                    }
+                }
+                else
+                {
+                    // Check for missing image asset data
+                    if (m_asset == null)
+                    {
+                        m_log.Warn("[J2KIMAGE]: RunUpdate() called with missing asset data (no missing image texture?). Canceling texture transfer");
+                        m_currentPacket = m_stopPacket;
+                        return;
+                    }
+                    
+                    if (DiscardLevel >= 0 || m_stopPacket == 0)
+                    {
+                        // This shouldn't happen, but if it does, we really can't proceed
+                        if (Layers == null)
+                        {
+                            m_log.Warn("[J2KIMAGE]: RunUpdate() called with missing Layers. Canceling texture transfer");
+                            m_currentPacket = m_stopPacket;
+                            return;
+                        }
+
+                        int maxDiscardLevel = Math.Max(0, Layers.Length - 1);
+
+                        // Treat initial texture downloads with a DiscardLevel of -1 a request for the highest DiscardLevel
+                        if (DiscardLevel < 0 && m_stopPacket == 0)
+                            DiscardLevel = (sbyte)maxDiscardLevel;
+
+                        // Clamp at the highest discard level
+                        DiscardLevel = (sbyte)Math.Min(DiscardLevel, maxDiscardLevel);
+
+                        //Calculate the m_stopPacket
+                        if (Layers.Length > 0)
+                        {
+                            m_stopPacket = (uint)GetPacketForBytePosition(Layers[(Layers.Length - 1) - DiscardLevel].End);
+                            //I don't know why, but the viewer seems to expect the final packet if the file
+                            //is just one packet bigger.
+                            if (TexturePacketCount() == m_stopPacket + 1)
+                            {
+                                m_stopPacket = TexturePacketCount();
+                            }
+                        }
+                        else
+                        {
+                            m_stopPacket = TexturePacketCount();
+                        }
+
+                        //Give them at least two packets, to play nice with some broken viewers (SL also behaves this way)
+                        if (m_stopPacket == 1 && Layers[0].End > FIRST_PACKET_SIZE) m_stopPacket++;
+
+                        m_currentPacket = StartPacket;
+                    }
+                }
+            }
+        }
+
+        private bool SendFirstPacket(LLClientView client)
+        {
+            if (client == null)
+                return false;
+
+            if (m_asset == null)
+            {
+                m_log.Warn("[J2KIMAGE]: Sending ImageNotInDatabase for texture " + TextureID);
+                client.SendImageNotFound(TextureID);
+                return true;
+            }
+            else if (m_asset.Length <= FIRST_PACKET_SIZE)
+            {
+                // We have less then one packet's worth of data
+                client.SendImageFirstPart(1, TextureID, (uint)m_asset.Length, m_asset, 2);
+                m_stopPacket = 0;
+                return true;
+            }
+            else
+            {
+                // This is going to be a multi-packet texture download
+                byte[] firstImageData = new byte[FIRST_PACKET_SIZE];
+
+                try { Buffer.BlockCopy(m_asset, 0, firstImageData, 0, FIRST_PACKET_SIZE); }
+                catch (Exception)
+                {
+                    m_log.ErrorFormat("[J2KIMAGE]: Texture block copy for the first packet failed. textureid={0}, assetlength={1}", TextureID, m_asset.Length);
+                    return true;
+                }
+
+                client.SendImageFirstPart(TexturePacketCount(), TextureID, (uint)m_asset.Length, firstImageData, (byte)ImageCodec.J2C);
+            }
+            return false;
+        }
+
+        private bool SendPacket(LLClientView client)
+        {
+            if (client == null)
+                return false;
+
+            bool complete = false;
+            int imagePacketSize = ((int)m_currentPacket == (TexturePacketCount())) ? LastPacketSize() : IMAGE_PACKET_SIZE;
+
+            try
+            {
+                if ((CurrentBytePosition() + IMAGE_PACKET_SIZE) > m_asset.Length)
+                {
+                    imagePacketSize = LastPacketSize();
+                    complete = true;
+                    if ((CurrentBytePosition() + imagePacketSize) > m_asset.Length)
+                    {
+                        imagePacketSize = m_asset.Length - CurrentBytePosition();
+                        complete = true;
+                    }
+                }
+
+                // It's concievable that the client might request packet one
+                // from a one packet image, which is really packet 0,
+                // which would leave us with a negative imagePacketSize..
+                if (imagePacketSize > 0)
+                {
+                    byte[] imageData = new byte[imagePacketSize];
+                    int currentPosition = CurrentBytePosition();
+
+                    try { Buffer.BlockCopy(m_asset, currentPosition, imageData, 0, imagePacketSize); }
+                    catch (Exception e)
+                    {
+                        m_log.ErrorFormat("[J2KIMAGE]: Texture block copy for the first packet failed. textureid={0}, assetlength={1}, currentposition={2}, imagepacketsize={3}, exception={4}",
+                            TextureID, m_asset.Length, currentPosition, imagePacketSize, e.Message);
+                        return false;
+                    }
+
+                    //Send the packet
+                    client.SendImageNextPart((ushort)(m_currentPacket - 1), TextureID, imageData);
+                }
+
+                return !complete;
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+        }
+
+        private ushort TexturePacketCount()
+        {
+            if (!IsDecoded)
+                return 0;
+
+            if (m_asset == null)
+                return 0;
+
+            if (m_asset.Length <= FIRST_PACKET_SIZE)
+                return 1;
+
+            return (ushort)(((m_asset.Length - FIRST_PACKET_SIZE + IMAGE_PACKET_SIZE - 1) / IMAGE_PACKET_SIZE) + 1);
+        }
+
+        private int GetPacketForBytePosition(int bytePosition)
+        {
+            return ((bytePosition - FIRST_PACKET_SIZE + IMAGE_PACKET_SIZE - 1) / IMAGE_PACKET_SIZE) + 1;
+        }
+
+        private int LastPacketSize()
+        {
+            if (m_currentPacket == 1)
+                return m_asset.Length;
+            int lastsize = (m_asset.Length - FIRST_PACKET_SIZE) % IMAGE_PACKET_SIZE;
+            //If the last packet size is zero, it's really cImagePacketSize, it sits on the boundary
+            if (lastsize == 0)
+            {
+                lastsize = IMAGE_PACKET_SIZE;
+            }
+            return lastsize;
+        }
+
+        private int CurrentBytePosition()
+        {
+            if (m_currentPacket == 0)
+                return 0;
+            if (m_currentPacket == 1)
+                return FIRST_PACKET_SIZE;
+
+            int result = FIRST_PACKET_SIZE + ((int)m_currentPacket - 2) * IMAGE_PACKET_SIZE;
+            if (result < 0)
+            {
+                result = FIRST_PACKET_SIZE;
+            }
+            return result;
+        }
+
+        private void J2KDecodedCallback(UUID AssetId, OpenJPEG.J2KLayerInfo[] layers)
+        {
+            Layers = layers;
+            IsDecoded = true;
+            RunUpdate();
+        }
+
+        private void AssetDataCallback(UUID AssetID, AssetBase asset)
+        {
+            HasAsset = true;
+
+            if (asset == null || asset.Data == null)
+            {
+                if (m_imageManager.MissingImage != null)
+                {
+                    m_asset = m_imageManager.MissingImage.Data;
+                }
+                else
+                {
+                    m_asset = null;
+                    IsDecoded = true;
+                }
+            }
+            else
+            {
+                m_asset = asset.Data;
+            }
+
+            RunUpdate();
+        }
+
+        private void AssetReceived(string id, Object sender, AssetBase asset)
+        {
+            UUID assetID = UUID.Zero;
+            if (asset != null)
+                assetID = asset.FullID;
+            else if ((InventoryAccessModule != null) && (sender != InventoryAccessModule))
+            {
+                // Unfortunately we need this here, there's no other way.
+                // This is due to the fact that textures opened directly from the agent's inventory
+                // don't have any distinguishing feature. As such, in order to serve those when the
+                // foreign user is visiting, we need to try again after the first fail to the local
+                // asset service.
+                string assetServerURL = string.Empty;
+                if (InventoryAccessModule.IsForeignUser(AgentID, out assetServerURL))
+                {
+                    m_log.DebugFormat("[J2KIMAGE]: texture {0} not found in local asset storage. Trying user's storage.", id);
+                    AssetService.Get(assetServerURL + "/" + id, InventoryAccessModule, AssetReceived);
+                    return;
+                }
+            }
+
+            AssetDataCallback(assetID, asset);
+
+        }
+    }
+}