f08e7191dc
* OnSimDisconnected and OnDisconnected events added * The Disconnect function is working * Shutdown() was added to kill the network layer * Added documentation for the Packet class * Added a TickCount to Packet for tracking ACK timeouts * Added a LastReceivedTime to Simulator for tracking disconnects * Optimized the NeedAck hashtable * Fixed a potential deadlock during Logout and removed a dodgy goto statement * Removed the try/catch from Logout to catch bugs * Added a not-logged-in catch in Logout * Removed the 1-second sleep from Logout * Connect returns the connected Simulator object or null now ObjectManager: * OnAvatarMoved and OnPrimMoved events are fired now Prims: * Minor function clarifications Avatar: * Uses the new Connect function for teleporting Packet: * Added documentation * HeaderLength is private now * Removed the Field() function * Miscellaneous cleanups git-svn-id: http://libopenmetaverse.googlecode.com/svn/trunk@195 52acb1d6-8a22-11de-b505-999d5b087335
850 lines
26 KiB
C#
850 lines
26 KiB
C#
/*
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* Copyright (c) 2006, Second Life Reverse Engineering Team
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* All rights reserved.
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*
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* - Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Neither the name of the Second Life Reverse Engineering Team nor the names
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* of its contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Net;
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using System.Collections;
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namespace libsecondlife
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{
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public struct Field
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{
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public object Data;
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public MapField Layout;
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public override string ToString()
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{
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string output = "";
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if (Layout.Type == FieldType.Variable || Layout.Type == FieldType.Fixed)
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{
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bool printable = true;
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byte[] byteArray = (byte[])Data;
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for (int i = 0; i < byteArray.Length; ++i)
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{
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// Check if there are any unprintable characters in the array
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if ((byteArray[i] < 0x20 || byteArray[i] > 0x7E) && byteArray[i] != 0x09
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&& byteArray[i] != 0x0D)
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{
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printable = false;
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}
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}
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if (printable)
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{
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output = Helpers.FieldToString(byteArray);
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}
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else
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{
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for (int i = 0; i < byteArray.Length; i += 16)
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{
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output += Layout.Name + ": ";
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for (int j = 0; j < 16; j++)
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{
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if ((i + j) < byteArray.Length)
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{
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output += String.Format("{0:X2} ", byteArray[i + j]);
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}
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else
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{
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output += " ";
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}
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}
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for (int j = 0; j < 16 && (i + j) < byteArray.Length; j++)
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{
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if (byteArray[i + j] >= 0x20 && byteArray[i + j] < 0x7E)
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{
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output += (char)byteArray[i + j];
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}
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else
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{
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output += ".";
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}
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}
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output += "\n";
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}
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}
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}
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else
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{
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output += Layout.Name + ": " + Data.ToString();
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}
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return output;
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}
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}
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public struct Block
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{
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public ArrayList Fields;
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public MapBlock Layout;
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}
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/// <summary>
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/// The Packet class is a wrapper around a raw UDP payload of a Second Life
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/// message. It is used for both constructing outgoing packets and
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/// interpreting incoming packets.
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/// </summary>
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public class Packet
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{
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/// <summary>
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/// This is the complete, raw UDP payload of an incoming or outgoing
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/// packet.
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/// </summary>
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public byte[] Data;
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/// <summary>
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/// The packet layout is built from the Second Life message template
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/// and describes all the blocks and fields of this packet. It is
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/// used to serialize and unserialize the packet data.
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/// </summary>
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public MapPacket Layout;
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/// <summary>
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/// Every Second Life message sent has an incremental sequence number
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/// that is used for tracking reliable packets and measuring packet
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/// loss. For outgoing packets the sequence number will be
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/// automatically set by the network layer as the packet is sent out.
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/// </summary>
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public ushort Sequence
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{
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get
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{
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// The sequence number is the third and fourth bytes of the packet, stored
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// in network order
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return (ushort)(Data[2] * 256 + Data[3]);
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}
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set
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{
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Data[2] = (byte)(value / 256);
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Data[3] = (byte)(value % 256);
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}
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}
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/// <summary>
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/// The TickCount is used for internally tracking packet timeouts,
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/// please do not use this member.
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/// </summary>
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public int TickCount;
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private ProtocolManager Protocol;
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/// <summary>
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/// Constructor used for building a packet where the length of the data
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/// is known in advance. This is being phased out in favor of
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/// pre-assembling the data or using PacketBuilder.BuildPacket().
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/// </summary>
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/// <param name="command">The name of the command in the message template</param>
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/// <param name="protocol">A reference to the ProtocolManager instance</param>
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/// <param name="length">The length of the packet data</param>
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public Packet(string command, ProtocolManager protocol, int length)
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{
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Protocol = protocol;
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Data = new byte[length];
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Layout = protocol.Command(command);
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if (Layout == null)
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{
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Console.WriteLine("Attempting to build a packet with invalid command \"" + command + "\"");
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// Create an empty Layout
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Layout = new MapPacket();
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Layout.Blocks = new ArrayList();
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return;
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}
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switch (Layout.Frequency)
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{
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case PacketFrequency.Low:
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// Set the low frequency identifier bits
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byte[] lowHeader = {0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF};
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Array.Copy(lowHeader, 0, Data, 0, 6);
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// Store the packet ID in network order
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Data[6] = (byte)(Layout.ID / 256);
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Data[7] = (byte)(Layout.ID % 256);
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break;
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case PacketFrequency.Medium:
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// Set the medium frequency identifier bits
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byte[] mediumHeader = {0x00, 0x00, 0x00, 0x00, 0xFF};
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Array.Copy(mediumHeader, 0, Data, 0, 5);
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Data[5] = (byte)Layout.ID;
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break;
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case PacketFrequency.High:
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// Set the high frequency identifier bits
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byte[] highHeader = {0x00, 0x00, 0x00, 0x00};
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Array.Copy(highHeader, 0, Data, 0, 4);
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Data[4] = (byte)Layout.ID;
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break;
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}
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}
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/// <summary>
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/// Constructor used to build a Packet object from incoming data.
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/// </summary>
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/// <param name="data">Byte array containing the full UDP payload</param>
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/// <param name="length">Length of the actual data in the byte array</param>
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/// <param name="protocol">A reference to the ProtocolManager instance</param>
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public Packet(byte[] data, int length, ProtocolManager protocol)
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: this(data, length, protocol, protocol.Command(data), true)
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{
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}
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/// <summary>
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/// This is a special constructor created specifically for optimizing
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/// SLProxy, do not use it under any circumstances.
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/// </summary>
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/// <param name="data"></param>
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/// <param name="length"></param>
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/// <param name="protocol"></param>
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/// <param name="layout"></param>
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/// <param name="copy"></param>
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public Packet(byte[] data, int length, ProtocolManager protocol, MapPacket layout, bool copy)
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{
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Protocol = protocol;
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Layout = layout;
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if (Layout == null)
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{
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// Create an empty MapPacket
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Layout = new MapPacket();
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Layout.Blocks = new ArrayList();
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}
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if (copy) {
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// Copy the network byte array to this packet's byte array
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Data = new byte[length];
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Array.Copy(data, 0, Data, 0, length);
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}
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else
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{
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// Use the buffer we got for Data
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Data = data;
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}
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}
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/// <summary>
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/// Unserializes packet data in to higher level representations
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/// and native C# data types.
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/// </summary>
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/// <returns>An ArrayList of all the Block objects in this packet,
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/// each of which contain Field objects for each data field.</returns>
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public ArrayList Blocks()
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{
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Field field;
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Block block;
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byte blockCount;
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int fieldSize;
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// Get the starting position of the SL payload (different than the UDP payload)
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int pos = HeaderLength();
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// Initialize the block list we are returning
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ArrayList blocks = new ArrayList();
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// Get the packet body's length so we can do bounds checking
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int length = Data.Length;
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if ((Data[0] & Helpers.MSG_APPENDED_ACKS) != 0)
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length -= Data[Data.Length - 1] * 4 + 1;
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foreach (MapBlock blockMap in Layout.Blocks)
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{
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if (blockMap.Count == -1)
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{
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// Variable count block
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if (pos < length)
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{
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blockCount = Data[pos];
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pos++;
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}
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else
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{
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// FIXME: Figure out a sane way to log from this function
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Console.WriteLine("WARNING: Blocks(): end of packet in 1-byte variable block count for " +
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Layout.Name + "." + blockMap.Name + " (" + pos + "/" + length + ")");
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goto Done;
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}
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}
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else
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{
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blockCount = (byte)blockMap.Count;
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}
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for (int i = 0; i < blockCount; ++i)
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{
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// Create a new block to push back on the list
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block = new Block();
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block.Layout = blockMap;
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block.Fields = new ArrayList();
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foreach (MapField fieldMap in blockMap.Fields)
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{
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if (fieldMap.Type == FieldType.Variable)
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{
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if (fieldMap.Count == 1)
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{
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// Field length described with one byte
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if (pos < length)
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{
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fieldSize = (ushort)Data[pos];
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pos++;
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}
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else
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{
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Console.WriteLine("WARNING: Blocks(): end of packet in 1-byte variable field count for " +
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Layout.Name + "." + blockMap.Name + "." + fieldMap.Name + " (" + pos + "/" + length + ")");
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goto BlockDone;
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}
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}
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else // (fieldMap.Count == 2)
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{
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// Field length described with two bytes
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if (pos + 1 < length)
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{
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fieldSize = (ushort)(Data[pos] + Data[pos + 1] * 256);
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pos += 2;
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}
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else
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{
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Console.WriteLine("WARNING: Blocks(): end of packet in 2-byte variable field count for " +
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Layout.Name + "." + blockMap.Name + "." + fieldMap.Name + " (" + pos + "/" + length + ")");
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goto BlockDone;
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}
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}
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if (fieldSize != 0)
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{
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if (pos + fieldSize <= length)
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{
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// Create a new field to add to the fields for this block
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field = new Field();
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field.Data = GetField(pos, fieldMap.Type, fieldSize);
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field.Layout = fieldMap;
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block.Fields.Add(field);
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pos += fieldSize;
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}
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else
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{
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Console.WriteLine("WARNING: Blocks(): end of packet in " + fieldSize +
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"-byte variable field " + Layout.Name + "." + blockMap.Name + "." + fieldMap.Name +
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" (" + pos + "/" + length + ")");
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goto BlockDone;
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}
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}
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else
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{
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// Create a zero-length byte-array for this field
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field = new Field();
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field.Data = new byte[0];
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field.Layout = fieldMap;
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block.Fields.Add(field);
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}
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}
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else if (fieldMap.Type == FieldType.Fixed)
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{
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fieldSize = fieldMap.Count;
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if (pos + fieldSize <= length)
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{
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// Create a new field to add to the fields for this block
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field = new Field();
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field.Data = GetField(pos, fieldMap.Type, fieldSize);
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field.Layout = fieldMap;
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block.Fields.Add(field);
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pos += fieldSize;
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}
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else
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{
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Console.WriteLine("WARNING: Blocks(): end of packet in " + fieldSize + "-byte fixed field " +
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Layout.Name + "." + blockMap.Name + "." + fieldMap.Name + " (" + pos + "/" + length + ")");
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goto BlockDone;
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}
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}
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else
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{
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for (int j = 0; j < fieldMap.Count; ++j)
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{
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fieldSize = (int)Protocol.TypeSizes[fieldMap.Type];
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if (pos + fieldSize <= length)
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{
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// Create a new field to add to the fields for this block
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field = new Field();
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field.Data = GetField(pos, fieldMap.Type, fieldSize);
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field.Layout = fieldMap;
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block.Fields.Add(field);
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pos += fieldSize;
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}
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else
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{
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Console.WriteLine("WARNING: Blocks(): end of packet in " + fieldSize + "-byte " +
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fieldMap.Type + " field " + Layout.Name + "." + blockMap.Name + "." + fieldMap.Name +
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" (" + pos + "/" + length + ")");
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goto BlockDone;
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}
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}
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}
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}
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BlockDone:
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blocks.Add(block);
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}
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}
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Done:
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return blocks;
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}
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public override string ToString()
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{
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string output = "";
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ArrayList blocks = Blocks();
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output += "---- " + Layout.Name + " ----\n";
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foreach (Block block in blocks)
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{
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output += "-- " + block.Layout.Name + " --\n";
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foreach (Field field in block.Fields)
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{
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output += field.ToString() + "\n";
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}
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}
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return output;
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}
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private int HeaderLength()
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{
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switch (Layout.Frequency)
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{
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case PacketFrequency.High:
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return 5;
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case PacketFrequency.Medium:
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return 6;
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case PacketFrequency.Low:
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return 8;
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}
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return 0;
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}
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private object GetField(int pos, FieldType type, int fieldSize)
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{
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switch (type)
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{
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case FieldType.U8:
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return Data[pos];
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case FieldType.U16:
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return (ushort)(Data[pos] + (Data[pos + 1] << 8));
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case FieldType.IPPORT:
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return (ushort)((Data[pos] << 8) + Data[pos + 1]);
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case FieldType.U32:
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return (uint)(Data[pos] + (Data[pos + 1] << 8) +
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(Data[pos + 2] << 16) + (Data[pos + 3] << 24));
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case FieldType.U64:
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return new U64(Data, pos);
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case FieldType.S8:
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return (sbyte)Data[pos];
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case FieldType.S16:
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return (short)(Data[pos] + (Data[pos + 1] << 8));
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case FieldType.S32:
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return Data[pos] + (Data[pos + 1] << 8) +
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(Data[pos + 2] << 16) + (Data[pos + 3] << 24);
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case FieldType.S64:
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return (long)(Data[pos] + (Data[pos + 1] << 8) +
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(Data[pos + 2] << 16) + (Data[pos + 3] << 24) +
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(Data[pos + 4] << 32) + (Data[pos + 5] << 40) +
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(Data[pos + 6] << 48) + (Data[pos + 7] << 56));
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case FieldType.F32:
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return BitConverter.ToSingle(Data, pos);
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case FieldType.F64:
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return BitConverter.ToDouble(Data, pos);
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case FieldType.LLUUID:
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return new LLUUID(Data, pos);
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case FieldType.BOOL:
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return (Data[pos] != 0) ? (bool)true : (bool)false;
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case FieldType.LLVector3:
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return new LLVector3(Data, pos);
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case FieldType.LLVector3d:
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return new LLVector3d(Data, pos);
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case FieldType.LLVector4:
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return new LLVector4(Data, pos);
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case FieldType.LLQuaternion:
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return new LLQuaternion(Data, pos);
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case FieldType.IPADDR:
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uint address = (uint)(Data[pos] + (Data[pos + 1] << 8) +
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(Data[pos + 2] << 16) + (Data[pos + 3] << 24));
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return new IPAddress(address);
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case FieldType.Variable:
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case FieldType.Fixed:
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byte[] bytes = new byte[fieldSize];
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Array.Copy(Data, pos, bytes, 0, fieldSize);
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return bytes;
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}
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return null;
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}
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}
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public class PacketBuilder
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{
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public static Packet BuildPacket(string name, ProtocolManager protocol, Hashtable blocks, byte flags)
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{
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Hashtable fields;
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ArrayList payload = new ArrayList();
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byte[] byteArray = new byte[4096];
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int length = 0;
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int blockCount = 0;
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int fieldLength = 0;
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IDictionaryEnumerator blocksEnum;
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MapPacket packetMap = protocol.Command(name);
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// Build the header
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#region Header
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switch (packetMap.Frequency)
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{
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case PacketFrequency.High:
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byteArray[4] = (byte)packetMap.ID;
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length = 5;
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break;
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case PacketFrequency.Medium:
|
|
byteArray[4] = 0xFF;
|
|
byteArray[5] = (byte)packetMap.ID;
|
|
length = 6;
|
|
break;
|
|
case PacketFrequency.Low:
|
|
byteArray[4] = 0xFF;
|
|
byteArray[5] = 0xFF;
|
|
byteArray[6] = (byte)(packetMap.ID / 256);
|
|
byteArray[7] = (byte)(packetMap.ID % 256);
|
|
length = 8;
|
|
break;
|
|
}
|
|
#endregion Header
|
|
|
|
foreach (MapBlock blockMap in packetMap.Blocks)
|
|
{
|
|
// If this is a variable count block, count the number of appearances of this block in the
|
|
// passed in Hashtable and prepend a counter byte
|
|
#region VariableSize
|
|
if (blockMap.Count == -1)
|
|
{
|
|
blockCount = 0;
|
|
|
|
// Count the number of this type of block in the blocks Hashtable
|
|
blocksEnum = blocks.GetEnumerator();
|
|
|
|
while (blocksEnum.MoveNext())
|
|
{
|
|
if ((string)blocksEnum.Value == blockMap.Name)
|
|
{
|
|
blockCount++;
|
|
}
|
|
}
|
|
|
|
if (blockCount > 255)
|
|
{
|
|
throw new Exception("Trying to put more than 255 blocks in a variable block");
|
|
}
|
|
|
|
// Prepend the blocks with a count
|
|
byteArray[length] = (byte)blockCount;
|
|
length++;
|
|
}
|
|
#endregion VariableSize
|
|
|
|
// Reset blockCount
|
|
blockCount = 0;
|
|
|
|
// Check for blocks of this type in the Hashtable
|
|
#region BuildBlock
|
|
blocksEnum = blocks.GetEnumerator();
|
|
|
|
while (blocksEnum.MoveNext())
|
|
{
|
|
if ((string)blocksEnum.Value == blockMap.Name)
|
|
{
|
|
// Found a match of this block
|
|
if ((blockMap.Count == -1 && blockCount < 255) || blockCount < blockMap.Count)
|
|
{
|
|
blockCount++;
|
|
|
|
#region TryBlockTypecast
|
|
try
|
|
{
|
|
fields = (Hashtable)blocksEnum.Key;
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
throw new Exception("A block Hashtable did not contain a fields Hashtable", e);
|
|
}
|
|
#endregion TryBlockTypecast
|
|
|
|
foreach (MapField fieldMap in blockMap.Fields)
|
|
{
|
|
if (fields.ContainsKey(fieldMap.Name))
|
|
{
|
|
object field = fields[fieldMap.Name];
|
|
|
|
#region AddField
|
|
switch (fieldMap.Type)
|
|
{
|
|
case FieldType.U8:
|
|
byteArray[length++] = (byte)field;
|
|
break;
|
|
case FieldType.U16:
|
|
ushort fieldUShort = (ushort)field;
|
|
byteArray[length++] = (byte)(fieldUShort % 256);
|
|
fieldUShort >>= 8;
|
|
byteArray[length++] = (byte)(fieldUShort % 256);
|
|
break;
|
|
case FieldType.U32:
|
|
uint fieldUInt = (uint)field;
|
|
byteArray[length++] = (byte)(fieldUInt % 256);
|
|
fieldUInt >>= 8;
|
|
byteArray[length++] = (byte)(fieldUInt % 256);
|
|
fieldUInt >>= 8;
|
|
byteArray[length++] = (byte)(fieldUInt % 256);
|
|
fieldUInt >>= 8;
|
|
byteArray[length++] = (byte)(fieldUInt % 256);
|
|
break;
|
|
case FieldType.U64:
|
|
// FIXME: Apply endianness patch
|
|
Array.Copy(((U64)field).GetBytes(), 0, byteArray, length, 8);
|
|
length += 8;
|
|
break;
|
|
case FieldType.S8:
|
|
byteArray[length++] = (byte)((sbyte)field);
|
|
break;
|
|
case FieldType.S16:
|
|
// FIXME: Apply endianness patch
|
|
Array.Copy(BitConverter.GetBytes((short)field), 0, byteArray, length, 2);
|
|
length += 2;
|
|
break;
|
|
case FieldType.S32:
|
|
// FIXME: Apply endianness patch
|
|
Array.Copy(BitConverter.GetBytes((int)field), 0, byteArray, length, 4);
|
|
length += 4;
|
|
break;
|
|
case FieldType.S64:
|
|
// FIXME: Apply endianness patch
|
|
Array.Copy(BitConverter.GetBytes((long)field), 0, byteArray, length, 8);
|
|
length += 8;
|
|
break;
|
|
case FieldType.F32:
|
|
Array.Copy(BitConverter.GetBytes((float)field), 0, byteArray, length, 4);
|
|
length += 4;
|
|
break;
|
|
case FieldType.F64:
|
|
Array.Copy(BitConverter.GetBytes((double)field), 0, byteArray, length, 8);
|
|
length += 8;
|
|
break;
|
|
case FieldType.LLUUID:
|
|
Array.Copy(((LLUUID)field).Data, 0, byteArray, length, 16);
|
|
length += 16;
|
|
break;
|
|
case FieldType.BOOL:
|
|
byteArray[length] = (byte)((bool)field == true ? 1 : 0);
|
|
length++;
|
|
break;
|
|
case FieldType.LLVector3:
|
|
Array.Copy(((LLVector3)field).GetBytes(), 0, byteArray, length, 12);
|
|
length += 12;
|
|
break;
|
|
case FieldType.LLVector3d:
|
|
Array.Copy(((LLVector3d)field).GetBytes(), 0, byteArray, length, 24);
|
|
length += 24;
|
|
break;
|
|
case FieldType.LLVector4:
|
|
Array.Copy(((LLVector4)field).GetBytes(), 0, byteArray, length, 16);
|
|
length += 16;
|
|
break;
|
|
case FieldType.LLQuaternion:
|
|
Array.Copy(((LLQuaternion)field).GetBytes(), 0, byteArray, length, 16);
|
|
length += 16;
|
|
break;
|
|
case FieldType.IPADDR:
|
|
Array.Copy(((IPAddress)field).GetAddressBytes(), 0, byteArray, length, 4);
|
|
length += 4;
|
|
break;
|
|
case FieldType.IPPORT:
|
|
ushort fieldIPPort = (ushort)field;
|
|
byteArray[length + 1] = (byte)(fieldIPPort % 256);
|
|
fieldIPPort >>= 8;
|
|
byteArray[length] = (byte)(fieldIPPort % 256);
|
|
length += 2;
|
|
break;
|
|
case FieldType.Variable:
|
|
if (field.GetType().IsArray)
|
|
{
|
|
// Assume this is a byte array
|
|
fieldLength = ((byte[])field).Length;
|
|
}
|
|
else
|
|
{
|
|
// Assume this is a string, add 1 for the null terminator
|
|
fieldLength = ((string)field).Length + 1;
|
|
}
|
|
|
|
if (fieldMap.Count == 1)
|
|
{
|
|
if (fieldLength > 255)
|
|
{
|
|
throw new Exception("Variable byte field longer than 255 characters");
|
|
}
|
|
|
|
byteArray[length] = (byte)(fieldLength);
|
|
length++;
|
|
}
|
|
else if (fieldMap.Count == 2)
|
|
{
|
|
if (fieldLength > 1024)
|
|
{
|
|
throw new Exception("Variable byte field longer than 1024 characters");
|
|
}
|
|
|
|
byteArray[length++] = (byte)(fieldLength % 256);
|
|
byteArray[length++] = (byte)(fieldLength / 256);
|
|
}
|
|
else
|
|
{
|
|
throw new Exception("Variable field with an unknown count, protocol map error");
|
|
}
|
|
|
|
if (field.GetType().IsArray)
|
|
{
|
|
// Assume this is a byte array
|
|
Array.Copy((byte[])field, 0, byteArray, length, fieldLength);
|
|
}
|
|
else
|
|
{
|
|
// Assume this is a string, add 1 for the null terminator
|
|
byte[] stringBytes = System.Text.Encoding.UTF8.GetBytes((string)field);
|
|
Array.Copy(stringBytes, 0, byteArray, length, stringBytes.Length);
|
|
fieldLength = stringBytes.Length + 1;
|
|
}
|
|
|
|
length += fieldLength;
|
|
|
|
break;
|
|
case FieldType.Fixed:
|
|
Array.Copy((byte[])field, 0, byteArray, length, fieldMap.Count);
|
|
length += fieldMap.Count;
|
|
break;
|
|
default:
|
|
throw new Exception("Unhandled FieldType");
|
|
}
|
|
#endregion AddField
|
|
}
|
|
else
|
|
{
|
|
// This field wasn't passed in, create an empty version
|
|
#region EmptyField
|
|
if (fieldMap.Type == FieldType.Variable)
|
|
{
|
|
// Just set the counter to zero and move on
|
|
if (fieldMap.Count == 2)
|
|
{
|
|
length += 2;
|
|
}
|
|
else
|
|
{
|
|
if (fieldMap.Count != 1)
|
|
{
|
|
throw new Exception("Variable length field has an invalid Count");
|
|
}
|
|
|
|
length++;
|
|
}
|
|
}
|
|
else if (fieldMap.Type == FieldType.Fixed)
|
|
{
|
|
length += fieldMap.Count;
|
|
}
|
|
else
|
|
{
|
|
length += (int)protocol.TypeSizes[fieldMap.Type];
|
|
}
|
|
#endregion EmptyField
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
throw new Exception("Too many blocks");
|
|
}
|
|
}
|
|
}
|
|
#endregion BuildBlock
|
|
|
|
// If this is a fixed count block and it doesn't appear in the Hashtable passed in, create
|
|
// empty filler blocks
|
|
#region EmptyBlock
|
|
if (blockCount == 0 && blockMap.Count != -1)
|
|
{
|
|
for (int i = 0; i < blockMap.Count; ++i)
|
|
{
|
|
foreach (MapField field in blockMap.Fields)
|
|
{
|
|
if (field.Type == FieldType.Variable)
|
|
{
|
|
length++;
|
|
}
|
|
else
|
|
{
|
|
length += (int)protocol.TypeSizes[field.Type];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endregion EmptyBlock
|
|
}
|
|
|
|
Packet packet = new Packet(byteArray, length, protocol);
|
|
packet.Data[0] = flags;
|
|
return packet;
|
|
}
|
|
}
|
|
}
|