1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* 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 libsecondlife;
using libsecondlife.Packets;
using OpenSim.Framework;
using OpenSim.Framework.Console;
namespace OpenSim.Region.Environment.Modules
{
/// <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
{
private static readonly log4net.ILog m_log
= log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
/// <summary>
/// Records the number of times texture send has been called.
/// </summary>
public int counter = 0;
/// <summary>
/// Holds the texture asset to send.
/// </summary>
private AssetBase m_asset;
//public LLUUID assetID { get { return m_asset.FullID; } }
/// <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;
public bool Cancel = false;
public bool ImageLoaded = false;
public bool Sending = false;
private IClientAPI RequestUser;
private int RequestedDiscardLevel = -1;
private uint StartPacketNumber = 0;
public TextureSender(IClientAPI client, int discardLevel, uint packetNumber)
{
RequestUser = client;
RequestedDiscardLevel = discardLevel;
StartPacketNumber = packetNumber;
}
/// <summary>
/// Load up the texture data to send.
/// </summary>
/// <param name="asset">
/// A <see cref="AssetBase"/>
/// </param>
public void TextureReceived(AssetBase asset)
{
m_asset = asset;
NumPackets = CalculateNumPackets(asset.Data.Length);
PacketCounter = (int) StartPacketNumber;
ImageLoaded = true;
}
public void UpdateRequest(int discardLevel, uint packetNumber)
{
RequestedDiscardLevel = discardLevel;
StartPacketNumber = packetNumber;
PacketCounter = (int) StartPacketNumber;
}
/// <summary>
/// Send a texture packet to the client.
/// </summary>
/// <returns>True if the last packet has been sent, false otherwise.</returns>
public bool SendTexturePacket()
{
SendPacket();
counter++;
if ((NumPackets == 0) || (RequestedDiscardLevel == -1) || (PacketCounter > NumPackets) ||
((RequestedDiscardLevel > 0) && (counter > 50 + (NumPackets/(RequestedDiscardLevel + 1)))))
{
return true;
}
return false;
}
/// <summary>
/// Sends a texture packet to the client.
/// </summary>
private void SendPacket()
{
if (PacketCounter <= NumPackets)
{
if (PacketCounter == 0)
{
if (NumPackets == 0)
{
ImageDataPacket im = new ImageDataPacket();
im.Header.Reliable = false;
im.ImageID.Packets = 1;
im.ImageID.ID = m_asset.FullID;
im.ImageID.Size = (uint) m_asset.Data.Length;
im.ImageData.Data = m_asset.Data;
im.ImageID.Codec = 2;
RequestUser.OutPacket(im, ThrottleOutPacketType.Texture);
PacketCounter++;
}
else
{
ImageDataPacket im = new ImageDataPacket();
im.Header.Reliable = false;
im.ImageID.Packets = (ushort) (NumPackets);
im.ImageID.ID = m_asset.FullID;
im.ImageID.Size = (uint) m_asset.Data.Length;
im.ImageData.Data = new byte[600];
Array.Copy(m_asset.Data, 0, im.ImageData.Data, 0, 600);
im.ImageID.Codec = 2;
RequestUser.OutPacket(im, ThrottleOutPacketType.Texture);
PacketCounter++;
}
}
else
{
ImagePacketPacket im = new ImagePacketPacket();
im.Header.Reliable = false;
im.ImageID.Packet = (ushort) (PacketCounter);
im.ImageID.ID = m_asset.FullID;
int size = m_asset.Data.Length - 600 - (1000*(PacketCounter - 1));
if (size > 1000) size = 1000;
im.ImageData.Data = new byte[size];
try
{
Array.Copy(m_asset.Data, 600 + (1000*(PacketCounter - 1)), im.ImageData.Data, 0, size);
}
catch (ArgumentOutOfRangeException)
{
m_log.Error("[TEXTURE]: Unable to separate texture into multiple packets: Array bounds failure on asset:" +
m_asset.FullID.ToString() );
return;
}
RequestUser.OutPacket(im, ThrottleOutPacketType.Texture);
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;
}
}
}
|
