/// <summary>
/// Constructor used for building a packet where the length of the data
/// is known in advance. This is being phased out in favor of
/// pre-assembling the data or using PacketBuilder.BuildPacket().
/// </summary>
/// <param name="command">The name of the command in the message template</param>
/// <param name="protocol">A reference to the ProtocolManager instance</param>
/// <param name="length">The length of the packet data</param>
public Packet(string command, ProtocolManager protocol, int length)
{
Protocol = protocol;
Data = new byte[length];
Layout = protocol.Command(command);
if (Layout == null)
{
Console.WriteLine("Attempting to build a packet with invalid command \"" + command + "\"");
// Create an empty Layout
Layout = new MapPacket();
Layout.Blocks = new ArrayList();
return;
}
switch (Layout.Frequency)
{
case PacketFrequency.Low:
// Set the low frequency identifier bits
byte[] lowHeader = { 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
Array.Copy(lowHeader, 0, Data, 0, 6);
// Store the packet ID in network order
Data[6] = (byte)(Layout.ID / 256);
Data[7] = (byte)(Layout.ID % 256);
break;
case PacketFrequency.Medium:
// Set the medium frequency identifier bits
byte[] mediumHeader = { 0x00, 0x00, 0x00, 0x00, 0xFF };
Array.Copy(mediumHeader, 0, Data, 0, 5);
Data[5] = (byte)Layout.ID;
break;
case PacketFrequency.High:
// Set the high frequency identifier bits
byte[] highHeader = { 0x00, 0x00, 0x00, 0x00 };
Array.Copy(highHeader, 0, Data, 0, 4);
Data[4] = (byte)Layout.ID;
break;
}
}
/// <summary>
/// This is a special constructor created specifically for optimizing
/// SLProxy, do not use it under any circumstances.
/// </summary>
/// <param name="data"></param>
/// <param name="length"></param>
/// <param name="protocol"></param>
/// <param name="layout"></param>
/// <param name="copy"></param>
public Packet(byte[] data, int length, ProtocolManager protocol, MapPacket layout, bool copy)
{
Protocol = protocol;
Layout = layout;
if (Layout == null)
{
// Create an empty MapPacket
Layout = new MapPacket();
Layout.Blocks = new ArrayList();
}
if (copy)
{
// Copy the network byte array to this packet's byte array
Data = new byte[length];
Array.Copy(data, 0, Data, 0, length);
}
else
{
// Use the buffer we got for Data
Data = data;
}
}
// UnregisterDelegates: unregister delegates for each packet in an array of packet maps
private static void UnregisterDelegates(Proxy proxy, MapPacket[] maps)
{
foreach (MapPacket map in maps)
if (map != null) {
loggedPackets.Remove(map.Name);
if (map.Name != "ChatFromViewer") {
proxy.RemoveDelegate(map.Name, Direction.Incoming);
proxy.RemoveDelegate(map.Name, Direction.Outgoing);
}
}
}
// RegisterDelegates: register delegates for each packet in an array of packet maps
private static void RegisterDelegates(Proxy proxy, MapPacket[] maps)
{
foreach (MapPacket map in maps)
if (map != null) {
loggedPackets[map.Name] = null;
if (map.Name != "ChatFromViewer") {
proxy.AddDelegate(map.Name, Direction.Incoming, new PacketDelegate(AnalyzeIn));
proxy.AddDelegate(map.Name, Direction.Outgoing, new PacketDelegate(AnalyzeOut));
}
}
}
/// <summary>
///
/// </summary>
/// <param name="mapFile"></param>
private void LoadMapFile(string mapFile)
{
FileStream map;
ushort low = 1;
ushort medium = 1;
ushort high = 1;
// Load the protocol map file
try
{
map = new FileStream(mapFile, FileMode.Open, FileAccess.Read);
}
catch (Exception e)
{
throw new Exception("Map file error", e);
}
try
{
StreamReader r = new StreamReader(map);
r.BaseStream.Seek(0, SeekOrigin.Begin);
string newline;
string trimmedline;
bool inPacket = false;
bool inBlock = false;
MapPacket currentPacket = null;
MapBlock currentBlock = null;
char[] trimArray = new char[] { ' ', '\t' };
// While not at the end of the file
while (r.Peek() > -1)
{
#region ParseMap
newline = r.ReadLine();
trimmedline = System.Text.RegularExpressions.Regex.Replace(newline, @"\s+", " ");
trimmedline = trimmedline.Trim(trimArray);
if (!inPacket)
{
// Outside of all packet blocks
if (trimmedline == "{")
{
inPacket = true;
}
}
else
{
// Inside of a packet block
if (!inBlock)
{
// Inside a packet block, outside of the blocks
if (trimmedline == "{")
{
inBlock = true;
}
else if (trimmedline == "}")
{
// Reached the end of the packet
currentPacket.Blocks.Sort();
inPacket = false;
}
else
{
// The packet header
#region ParsePacketHeader
// Splice the string in to tokens
string[] tokens = trimmedline.Split(new char[] { ' ', '\t' });
if (tokens.Length > 3)
{
//Hash packet name to insure correct keyword ordering
KeywordPosition(tokens[0]);
if (tokens[1] == "Fixed")
{
// Remove the leading "0x"
if (tokens[2].Substring(0, 2) == "0x")
{
tokens[2] = tokens[2].Substring(2, tokens[2].Length - 2);
}
uint fixedID = UInt32.Parse(tokens[2], System.Globalization.NumberStyles.HexNumber);
// Truncate the id to a short
fixedID ^= 0xFFFF0000;
LowMaps[fixedID] = new MapPacket();
LowMaps[fixedID].ID = (ushort)fixedID;
LowMaps[fixedID].Frequency = PacketFrequency.Low;
LowMaps[fixedID].Name = tokens[0];
LowMaps[fixedID].Trusted = (tokens[3] == "Trusted");
LowMaps[fixedID].Encoded = (tokens[4] == "Zerocoded");
LowMaps[fixedID].Blocks = new List <MapBlock>();
currentPacket = LowMaps[fixedID];
}
else if (tokens[1] == "Low")
{
LowMaps[low] = new MapPacket();
LowMaps[low].ID = low;
LowMaps[low].Frequency = PacketFrequency.Low;
LowMaps[low].Name = tokens[0];
LowMaps[low].Trusted = (tokens[2] == "Trusted");
LowMaps[low].Encoded = (tokens[3] == "Zerocoded");
LowMaps[low].Blocks = new List <MapBlock>();
currentPacket = LowMaps[low];
low++;
}
else if (tokens[1] == "Medium")
{
MediumMaps[medium] = new MapPacket();
MediumMaps[medium].ID = medium;
MediumMaps[medium].Frequency = PacketFrequency.Medium;
MediumMaps[medium].Name = tokens[0];
MediumMaps[medium].Trusted = (tokens[2] == "Trusted");
MediumMaps[medium].Encoded = (tokens[3] == "Zerocoded");
MediumMaps[medium].Blocks = new List <MapBlock>();
currentPacket = MediumMaps[medium];
medium++;
}
else if (tokens[1] == "High")
{
HighMaps[high] = new MapPacket();
HighMaps[high].ID = high;
HighMaps[high].Frequency = PacketFrequency.High;
HighMaps[high].Name = tokens[0];
HighMaps[high].Trusted = (tokens[2] == "Trusted");
HighMaps[high].Encoded = (tokens[3] == "Zerocoded");
HighMaps[high].Blocks = new List <MapBlock>();
currentPacket = HighMaps[high];
high++;
}
else
{
Client.Log("Unknown packet frequency", Helpers.LogLevel.Error);
}
}
#endregion
}
}
else
{
if (trimmedline.Length > 0 && trimmedline.Substring(0, 1) == "{")
{
// A field
#region ParseField
MapField field = new MapField();
// Splice the string in to tokens
string[] tokens = trimmedline.Split(new char[] { ' ', '\t' });
field.Name = tokens[1];
field.KeywordPosition = KeywordPosition(field.Name);
field.Type = (FieldType)Enum.Parse(typeof(FieldType), tokens[2], true);
if (tokens[3] != "}")
{
field.Count = Int32.Parse(tokens[3]);
}
else
{
field.Count = 1;
}
// Save this field to the current block
currentBlock.Fields.Add(field);
#endregion
}
else if (trimmedline == "}")
{
currentBlock.Fields.Sort();
inBlock = false;
}
else if (trimmedline.Length != 0 && trimmedline.Substring(0, 2) != "//")
{
// The block header
#region ParseBlockHeader
currentBlock = new MapBlock();
// Splice the string in to tokens
string[] tokens = trimmedline.Split(new char[] { ' ', '\t' });
currentBlock.Name = tokens[0];
currentBlock.KeywordPosition = KeywordPosition(currentBlock.Name);
currentBlock.Fields = new List <MapField>();
currentPacket.Blocks.Add(currentBlock);
if (tokens[1] == "Single")
{
currentBlock.Count = 1;
}
else if (tokens[1] == "Multiple")
{
currentBlock.Count = Int32.Parse(tokens[2]);
}
else if (tokens[1] == "Variable")
{
currentBlock.Count = -1;
}
else
{
Client.Log("Unknown block frequency", Helpers.LogLevel.Error);
}
#endregion
}
}
}
#endregion
}
r.Close();
map.Close();
}
catch (Exception e)
{
throw e;
}
}
/// <summary>
///
/// </summary>
/// <param name="map"></param>
/// <param name="frequency"></param>
private void PrintOneMap(MapPacket[] map, string frequency)
{
int i;
for (i = 0; i < map.Length; ++i)
{
if (map[i] != null)
{
Console.WriteLine("{0} {1,5} - {2} - {3} - {4}", frequency, i, map[i].Name,
map[i].Trusted ? "Trusted" : "Untrusted",
map[i].Encoded ? "Unencoded" : "Zerocoded");
foreach (MapBlock block in map[i].Blocks)
{
if (block.Count == -1)
{
Console.WriteLine("\t{0,4} {1} (Variable)", block.KeywordPosition, block.Name);
}
else
{
Console.WriteLine("\t{0,4} {1} ({2})", block.KeywordPosition, block.Name, block.Count);
}
foreach (MapField field in block.Fields)
{
Console.WriteLine("\t\t{0,4} {1} ({2} / {3})", field.KeywordPosition, field.Name,
field.Type, field.Count);
}
}
}
}
}
/// <summary>
///
/// </summary>
/// <param name="mapFile"></param>
private void LoadMapFile(string mapFile)
{
FileStream map;
ushort low = 1;
ushort medium = 1;
ushort high = 1;
// Load the protocol map file
try
{
map = new FileStream(mapFile, FileMode.Open, FileAccess.Read);
}
catch(Exception e)
{
throw new Exception("Map file error", e);
}
try
{
StreamReader r = new StreamReader(map);
r.BaseStream.Seek(0, SeekOrigin.Begin);
string newline;
string trimmedline;
bool inPacket = false;
bool inBlock = false;
MapPacket currentPacket = null;
MapBlock currentBlock = null;
char[] trimArray = new char[] {' ', '\t'};
// While not at the end of the file
while (r.Peek() > -1)
{
#region ParseMap
newline = r.ReadLine();
trimmedline = System.Text.RegularExpressions.Regex.Replace(newline, @"\s+", " ");
trimmedline = trimmedline.Trim(trimArray);
if (!inPacket)
{
// Outside of all packet blocks
if (trimmedline == "{")
{
inPacket = true;
}
}
else
{
// Inside of a packet block
if (!inBlock)
{
// Inside a packet block, outside of the blocks
if (trimmedline == "{")
{
inBlock = true;
}
else if (trimmedline == "}")
{
// Reached the end of the packet
currentPacket.Blocks.Sort();
inPacket = false;
}
else
{
// The packet header
#region ParsePacketHeader
// Splice the string in to tokens
string[] tokens = trimmedline.Split(new char[] {' ', '\t'});
if (tokens.Length > 3)
{
//Hash packet name to insure correct keyword ordering
KeywordPosition(tokens[0]);
if (tokens[1] == "Fixed")
{
// Remove the leading "0x"
if (tokens[2].Substring(0, 2) == "0x")
{
tokens[2] = tokens[2].Substring(2, tokens[2].Length - 2);
}
uint fixedID = UInt32.Parse(tokens[2], System.Globalization.NumberStyles.HexNumber);
// Truncate the id to a short
fixedID ^= 0xFFFF0000;
LowMaps[fixedID] = new MapPacket();
LowMaps[fixedID].ID = (ushort)fixedID;
LowMaps[fixedID].Frequency = PacketFrequency.Low;
LowMaps[fixedID].Name = tokens[0];
LowMaps[fixedID].Trusted = (tokens[3] == "Trusted");
LowMaps[fixedID].Encoded = (tokens[4] == "Zerocoded");
LowMaps[fixedID].Blocks = new List<MapBlock>();
currentPacket = LowMaps[fixedID];
}
else if (tokens[1] == "Low")
{
LowMaps[low] = new MapPacket();
LowMaps[low].ID = low;
LowMaps[low].Frequency = PacketFrequency.Low;
LowMaps[low].Name = tokens[0];
LowMaps[low].Trusted = (tokens[2] == "Trusted");
LowMaps[low].Encoded = (tokens[3] == "Zerocoded");
LowMaps[low].Blocks = new List<MapBlock>();
currentPacket = LowMaps[low];
low++;
}
else if (tokens[1] == "Medium")
{
MediumMaps[medium] = new MapPacket();
MediumMaps[medium].ID = medium;
MediumMaps[medium].Frequency = PacketFrequency.Medium;
MediumMaps[medium].Name = tokens[0];
MediumMaps[medium].Trusted = (tokens[2] == "Trusted");
MediumMaps[medium].Encoded = (tokens[3] == "Zerocoded");
MediumMaps[medium].Blocks = new List<MapBlock>();
currentPacket = MediumMaps[medium];
medium++;
}
else if (tokens[1] == "High")
{
HighMaps[high] = new MapPacket();
HighMaps[high].ID = high;
HighMaps[high].Frequency = PacketFrequency.High;
HighMaps[high].Name = tokens[0];
HighMaps[high].Trusted = (tokens[2] == "Trusted");
HighMaps[high].Encoded = (tokens[3] == "Zerocoded");
HighMaps[high].Blocks = new List<MapBlock>();
currentPacket = HighMaps[high];
high++;
}
else
{
Client.Log("Unknown packet frequency", Helpers.LogLevel.Error);
}
}
#endregion
}
}
else
{
if (trimmedline.Length > 0 && trimmedline.Substring(0, 1) == "{")
{
// A field
#region ParseField
MapField field = new MapField();
// Splice the string in to tokens
string[] tokens = trimmedline.Split(new char[] {' ', '\t'});
field.Name = tokens[1];
field.KeywordPosition = KeywordPosition(field.Name);
field.Type = (FieldType)Enum.Parse(typeof(FieldType), tokens[2], true);
if (tokens[3] != "}")
{
field.Count = Int32.Parse(tokens[3]);
}
else
{
field.Count = 1;
}
// Save this field to the current block
currentBlock.Fields.Add(field);
#endregion
}
else if (trimmedline == "}")
{
currentBlock.Fields.Sort();
inBlock = false;
}
else if (trimmedline.Length != 0 && trimmedline.Substring(0, 2) != "//")
{
// The block header
#region ParseBlockHeader
currentBlock = new MapBlock();
// Splice the string in to tokens
string[] tokens = trimmedline.Split(new char[] {' ', '\t'});
currentBlock.Name = tokens[0];
currentBlock.KeywordPosition = KeywordPosition(currentBlock.Name);
currentBlock.Fields = new List<MapField>();
currentPacket.Blocks.Add(currentBlock);
if (tokens[1] == "Single")
{
currentBlock.Count = 1;
}
else if (tokens[1] == "Multiple")
{
currentBlock.Count = Int32.Parse(tokens[2]);
}
else if (tokens[1] == "Variable")
{
currentBlock.Count = -1;
}
else
{
Client.Log("Unknown block frequency", Helpers.LogLevel.Error);
}
#endregion
}
}
}
#endregion
}
r.Close();
map.Close();
}
catch (Exception e)
{
throw e;
}
}
public static Packet BuildPacket(string name, ProtocolManager protocol, Hashtable blocks, byte flags)
{
Hashtable fields;
byte[] byteArray = new byte[4096];
int length = 0;
int blockCount = 0;
int fieldLength = 0;
IDictionaryEnumerator blocksEnum;
MapPacket packetMap = protocol.Command(name);
// Build the header
#region Header
switch (packetMap.Frequency)
{
case PacketFrequency.High:
byteArray[4] = (byte)packetMap.ID;
length = 5;
break;
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);
}
/// <summary>
/// This is a special constructor created specifically for optimizing
/// SLProxy, do not use it under any circumstances.
/// </summary>
/// <param name="data"></param>
/// <param name="length"></param>
/// <param name="protocol"></param>
/// <param name="layout"></param>
/// <param name="copy"></param>
public Packet(byte[] data, int length, ProtocolManager protocol, MapPacket layout, bool copy)
{
Protocol = protocol;
Layout = layout;
if (Layout == null)
{
// Create an empty MapPacket
Layout = new MapPacket();
Layout.Blocks = new ArrayList();
}
if (copy) {
// Copy the network byte array to this packet's byte array
Data = new byte[length];
Array.Copy(data, 0, Data, 0, length);
}
else
{
// Use the buffer we got for Data
Data = data;
}
}
/// <summary>
/// Constructor used for building a packet where the length of the data
/// is known in advance. This is being phased out in favor of
/// pre-assembling the data or using PacketBuilder.BuildPacket().
/// </summary>
/// <param name="command">The name of the command in the message template</param>
/// <param name="protocol">A reference to the ProtocolManager instance</param>
/// <param name="length">The length of the packet data</param>
public Packet(string command, ProtocolManager protocol, int length)
{
Protocol = protocol;
Data = new byte[length];
Layout = protocol.Command(command);
if (Layout == null)
{
Console.WriteLine("Attempting to build a packet with invalid command \"" + command + "\"");
// Create an empty Layout
Layout = new MapPacket();
Layout.Blocks = new ArrayList();
return;
}
switch (Layout.Frequency)
{
case PacketFrequency.Low:
// Set the low frequency identifier bits
byte[] lowHeader = {0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF};
Array.Copy(lowHeader, 0, Data, 0, 6);
// Store the packet ID in network order
Data[6] = (byte)(Layout.ID / 256);
Data[7] = (byte)(Layout.ID % 256);
break;
case PacketFrequency.Medium:
// Set the medium frequency identifier bits
byte[] mediumHeader = {0x00, 0x00, 0x00, 0x00, 0xFF};
Array.Copy(mediumHeader, 0, Data, 0, 5);
Data[5] = (byte)Layout.ID;
break;
case PacketFrequency.High:
// Set the high frequency identifier bits
byte[] highHeader = {0x00, 0x00, 0x00, 0x00};
Array.Copy(highHeader, 0, Data, 0, 4);
Data[4] = (byte)Layout.ID;
break;
}
}
