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Packet.cs
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Packet.cs
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/*
* DAWN OF LIGHT - The first free open source DAoC server emulator
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
using System;
using System.IO;
using System.Text;
namespace PacketLogConverter
{
public enum ePacketDirection : byte
{
ServerToClient,
ClientToServer,
}
public enum ePacketProtocol : byte
{
UDP,
TCP,
}
/// <summary>
/// Base class for all packets
/// </summary>
public class Packet : MemoryStream
{
public const int MAX_CODE = byte.MaxValue+1;
private byte m_code;
private ePacketDirection m_direction;
private ePacketProtocol m_protocol;
private TimeSpan m_time;
private LogPacketAttribute m_attribute;
private bool m_initialized;
private bool m_allowClassChange = true;
private long m_positionAfterInit;
private Exception m_initException;
public Packet(int capacity) : base(capacity)
{
}
public byte Code
{
get { return m_code; }
set { m_code = value; }
}
public ePacketDirection Direction
{
get { return m_direction; }
set { m_direction = value; }
}
public ePacketProtocol Protocol
{
get { return m_protocol; }
set { m_protocol = value; }
}
public TimeSpan Time
{
get { return m_time; }
set { m_time = value; }
}
public LogPacketAttribute Attribute
{
get { return m_attribute; }
set { m_attribute = value; }
}
public bool Initialized
{
get { return m_initialized; }
set { m_initialized = value; }
}
public bool AllowClassChange
{
get { return m_allowClassChange; }
set { m_allowClassChange = value; }
}
public long PositionAfterInit
{
get { return m_positionAfterInit; }
set { m_positionAfterInit = value; }
}
public Exception InitException
{
get { return m_initException; }
set { m_initException = value; }
}
public byte this[long index]
{
get
{
if (index >= Length)
throw new Exception("item[]: tried to read more data than contained in the packet (pos="+Position+", len="+Length+")");
Position = index;
return (byte)ReadByte();
}
}
#region Stream read helpers
public new byte ReadByte()
{
int b = base.ReadByte();
if (b < 0)
throw new Exception("ReadByte(): tried to read more data than contained in the packet (pos="+Position+", len="+Length+")");
return (byte)b;
}
/// <summary>
/// Reads in 2 bytes and converts it from network to host byte order
/// </summary>
/// <returns>A 2 byte (short) value</returns>
public ushort ReadShort()
{
byte v1 = ReadByte();
byte v2 = ReadByte();
return Marshal.ConvertToUInt16(v1, v2);
}
/// <summary>
/// Reads in 2 bytes
/// </summary>
/// <returns>A 2 byte (short) value in network byte order</returns>
public ushort ReadShortLowEndian()
{
byte v1 = ReadByte();
byte v2 = ReadByte();
return Marshal.ConvertToUInt16(v2, v1);
}
/// <summary>
/// Reads in 4 bytes and converts it from network to host byte order
/// </summary>
/// <returns>A 4 byte value</returns>
public uint ReadInt()
{
byte v1 = ReadByte();
byte v2 = ReadByte();
byte v3 = ReadByte();
byte v4 = ReadByte();
return Marshal.ConvertToUInt32(v1, v2, v3, v4);
}
/// <summary>
/// Reads in 4 bytes value in network byte order
/// </summary>
/// <returns>A 4 byte value</returns>
public uint ReadIntLowEndian()
{
byte v1 = ReadByte();
byte v2 = ReadByte();
byte v3 = ReadByte();
byte v4 = ReadByte();
return Marshal.ConvertToUInt32(v4, v3, v2, v1);
}
/// <summary>
/// Reads in 8 bytes and converts it from network to host byte order
/// </summary>
/// <returns>A 8 byte value</returns>
public ulong ReadLong()
{
byte v1 = ReadByte();
byte v2 = ReadByte();
byte v3 = ReadByte();
byte v4 = ReadByte();
byte v5 = ReadByte();
byte v6 = ReadByte();
byte v7 = ReadByte();
byte v8 = ReadByte();
return Marshal.ConvertToUInt64(v1, v2, v3, v4, v5, v6, v7, v8);
}
/// <summary>
/// Reads in 8 bytes value in network byte order
/// </summary>
/// <returns>A 8 byte value</returns>
public ulong ReadLongLowEndian()
{
byte v1 = ReadByte();
byte v2 = ReadByte();
byte v3 = ReadByte();
byte v4 = ReadByte();
byte v5 = ReadByte();
byte v6 = ReadByte();
byte v7 = ReadByte();
byte v8 = ReadByte();
return Marshal.ConvertToUInt64(v8, v7, v6, v5, v4, v3, v2, v1);
}
/// <summary>
/// Reads float value in network byte order.
/// </summary>
/// <returns></returns>
public float ReadFloat()
{
uint data = ReadInt();
return Util.GetFloat(data);
}
/// <summary>
/// Reads float value in host byte order.
/// </summary>
/// <returns></returns>
public float ReadFloatLowEndian()
{
uint data = ReadIntLowEndian();
return Util.GetFloat(data);
}
/// <summary>
/// Reads the time span.
/// </summary>
/// <returns>Timespan</returns>
public TimeSpan ReadTimeSpan()
{
uint data = ReadInt();
return Util.GetTimeSpan(data);
}
/// <summary>
/// Reads the time span low endian.
/// </summary>
/// <returns>Timespan</returns>
public TimeSpan ReadTimeSpanLowEndian()
{
uint data = ReadIntLowEndian();
return Util.GetTimeSpan(data);
}
/// <summary>
/// Skips 'num' bytes ahead in the stream
/// </summary>
/// <param name="num">Number of bytes to skip ahead</param>
public void Skip(long num)
{
if (Position + num > Length)
throw new Exception("Skip(long num): tried to skip more data than contained in the packet (pos="+Position+", len="+Length+")");
Seek(num, SeekOrigin.Current);
}
/// <summary>
/// Reads the zero-terminated string.
/// </summary>
/// <returns>Read string</returns>
public string ReadString()
{
byte[] buf = new byte[Length];
for (int i = 0; i >= 0; i++)
{
byte b = ReadByte();
if (b == 0) break;
buf[i] = b;
}
return Marshal.ConvertToString(buf);
}
/// <summary>
/// Reads a null-terminated string from the stream
/// </summary>
/// <param name="maxlen">Maximum number of bytes to read in</param>
/// <returns>A string of maxlen or less</returns>
public string ReadString(int maxlen)
{
byte[] buf = new byte[maxlen];
Read(buf, 0, maxlen);
return Marshal.ConvertToString(buf);
}
/// <summary>
/// Reads in a pascal style string
/// </summary>
/// <returns>A string from the stream</returns>
public string ReadPascalString()
{
int size = ReadByte();
return ReadString(size);
}
public string ReadString(long stringOffset, int maxlen)
{
Position = stringOffset;
return ReadString(maxlen);
}
public string ReadPascalString(long stringOffset)
{
Position = stringOffset;
return ReadPascalString();
}
#endregion
/// <summary>
/// Gets the packet description
/// </summary>
public string Description
{
get
{
if (m_attribute == null || m_attribute.Description == null)
return DefaultPacketDescriptions.GetDescription(Code, Direction);
return m_attribute.Description;
}
}
public virtual void ToHumanReadableString(TextWriter text, TimeSpan baseTime, bool flagsDescription)
{
TimeSpan time = Time - baseTime;
if (time.Ticks < 0)
{
text.Write('-');
time = time.Negate();
}
else if (baseTime.Ticks != 0)
text.Write('+');
if (time.Days > 0)
{
text.Write(time.Days);
text.Write('d');
}
text.Write(time.Hours.ToString("D2")); text.Write(':');
text.Write(time.Minutes.ToString("D2")); text.Write(':');
text.Write(time.Seconds.ToString("D2")); text.Write('.');
text.Write(time.Milliseconds.ToString("D3"));
text.Write(' ');
switch (Direction)
{
case ePacketDirection.ClientToServer: text.Write("S<=C"); break;
case ePacketDirection.ServerToClient: text.Write("S=>C"); break;
default: text.Write(Direction.ToString()); break;
}
if (PositionAfterInit > Length)
{
text.Write("(PositionAfterInit > PacketLength !)");
}
text.Write(" 0x{0} {1}", Code.ToString("X2"), Description);
text.Write(" (");
if (!Initialized)
{
text.Write("PACKET NOT INITIALIZED. Most likely errors during Init(). ");
text.Write(this.GetType().Name);
text.WriteLine();
if (InitException != null)
{
// Replace new line in exceptions with correct new line chars
text.Write(InitException.ToString());
text.WriteLine();
}
}
try
{
GetPacketDataString(text, flagsDescription);
}
catch (Exception e)
{
text.Write(e.GetType().ToString());
text.Write(": ");
text.Write(e.Message);
}
text.Write(")");
AppendNotInitializedData(text);
}
public virtual void AppendNotInitializedData(TextWriter text)
{
if (PositionAfterInit < Length && !GetType().Equals(typeof(Packet)))
{
text.Write(" not initialized data from pos {0} ({1}): (", PositionAfterInit.ToString(), (Length - PositionAfterInit).ToString());
Position = PositionAfterInit;
text.Write("0x");
text.Write(ReadByte().ToString("X2"));
while (Position < Length)
{
text.Write(",0x");
text.Write(ReadByte().ToString("X2"));
}
text.Write(')');
}
}
/// <summary>
/// Gets all the packet data as a human readable string.
/// </summary>
/// <param name="text">Buffer to write to.</param>
/// <param name="flagsDescription">Include flags description in output.</param>
public virtual void GetPacketDataString(TextWriter text, bool flagsDescription)
{
}
public override string ToString()
{
StringBuilder str = new StringBuilder();
switch (Direction)
{
case ePacketDirection.ClientToServer: str.Append("S<=C"); break;
case ePacketDirection.ServerToClient: str.Append("S=>C"); break;
default: str.Append(Direction); break;
}
str.AppendFormat(" 0x{0:X2} {1}", Code, Description);
return str.ToString();
}
/// <summary>
/// Copy all data from another packet and init private fields if any
/// </summary>
/// <param name="pak"></param>
/// <returns>The target packet instance (this)</returns>
public virtual Packet CopyFrom(Packet pak)
{
m_code = pak.m_code;
m_direction = pak.m_direction;
m_time = pak.m_time;
m_protocol = pak.m_protocol;
SetLength(0);
Position = 0;
pak.Position = 0;
pak.WriteTo(this);
return this;
}
/// <summary>
/// Initializes the packet. All data parsing must be done here.
/// </summary>
public virtual void Init()
{
}
/// <summary>
/// Set all log variables from the packet here
/// </summary>
/// <param name="log"></param>
public virtual void InitLog(PacketLog log)
{
}
#warning TODO: Remove some day - requires convertion of actions to new system
public string ToHumanReadableString(TimeSpan baseTime, bool flagsDescription)
{
using (StringWriter sw = new StringWriter())
{
ToHumanReadableString(sw, baseTime, flagsDescription);
return sw.ToString();
}
}
public string GetPacketDataString(bool flagsDescription)
{
using (StringWriter sw = new StringWriter())
{
GetPacketDataString(sw, flagsDescription);
return sw.ToString();
}
}
}
}