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NetPacket.cs
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209 lines (184 loc) · 6.75 KB
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using System;
using LiteNetLib.Utils;
namespace LiteNetLib
{
internal enum PacketProperty : byte
{
None, //0
Reliable, //1
Sequenced, //2
ReliableOrdered, //3
AckReliable, //4
AckReliableOrdered, //5
Ping, //6
Pong, //7
ConnectRequest, //8
ConnectAccept, //9
Disconnect, //10
UnconnectedMessage, //11
NatIntroductionRequest, //12
NatIntroduction, //13
NatPunchMessage, //14
MtuCheck, //15
MtuOk, //16
DiscoveryRequest, //17
DiscoveryResponse //18
}
internal sealed class NetPacket
{
private const int LastProperty = 18;
//Header
public PacketProperty Property
{
get { return (PacketProperty)(RawData[0] & 0x7F); }
set { RawData[0] = (byte)((RawData[0] & 0x80) | ((byte)value & 0x7F)); }
}
public ushort Sequence
{
get { return BitConverter.ToUInt16(RawData, 1); }
set { FastBitConverter.GetBytes(RawData, 1, value); }
}
public bool IsFragmented
{
get { return (RawData[0] & 0x80) != 0; }
set
{
if (value)
RawData[0] |= 0x80; //set first bit
else
RawData[0] &= 0x7F; //unset first bit
}
}
public ushort FragmentId
{
get { return BitConverter.ToUInt16(RawData, 3); }
set { FastBitConverter.GetBytes(RawData, 3, value); }
}
public ushort FragmentPart
{
get { return BitConverter.ToUInt16(RawData, 5); }
set { FastBitConverter.GetBytes(RawData, 5, value); }
}
public ushort FragmentsTotal
{
get { return BitConverter.ToUInt16(RawData, 7); }
set { FastBitConverter.GetBytes(RawData, 7, value); }
}
//Data
public byte[] RawData;
//Packet constructor
public void Init(PacketProperty property, int dataSize)
{
RawData = new byte[GetHeaderSize(property) + dataSize];
Property = property;
}
//Always not fragmented
public static byte[] CreateRawPacket(PacketProperty property, int dataSize)
{
byte[] rawData = new byte[GetHeaderSize(property) + dataSize];
rawData[0] = (byte) property;
return rawData;
}
public static byte[] CreateRawPacket(PacketProperty property, byte[] data, int start, int count)
{
int headerSize = GetHeaderSize(property);
byte[] rawData = new byte[headerSize + count];
rawData[0] = (byte)property;
Buffer.BlockCopy(data, start, rawData, headerSize, count);
return rawData;
}
public static byte[] CreateRawPacket(PacketProperty property, NetDataWriter dataWriter)
{
int headerSize = GetHeaderSize(property);
byte[] rawData = new byte[headerSize + dataWriter.Length];
rawData[0] = (byte)property;
Buffer.BlockCopy(dataWriter.Data, 0, rawData, headerSize, dataWriter.Length);
return rawData;
}
public void Init(PacketProperty property, NetDataWriter dataWriter)
{
int headerSize = GetHeaderSize(property);
RawData = new byte[headerSize + dataWriter.Length];
Property = property;
Buffer.BlockCopy(dataWriter.Data, 0, RawData, headerSize, dataWriter.Length);
}
public void PutData(byte[] data, int start, int length)
{
int packetStart = GetHeaderSize(Property) + (IsFragmented ? NetConstants.FragmentHeaderSize : 0);
Buffer.BlockCopy(data, start, RawData, packetStart, length);
}
public static bool GetPacketProperty(byte[] data, out PacketProperty property)
{
byte properyByte = (byte)(data[0] & 0x7F);
if (properyByte > LastProperty)
{
property = PacketProperty.None;
return false;
}
property = (PacketProperty)properyByte;
return true;
}
public static bool ComparePacketProperty(byte[] data, PacketProperty check)
{
PacketProperty property;
if (GetPacketProperty(data, out property))
{
return property == check;
}
return false;
}
public static int GetHeaderSize(PacketProperty property)
{
return IsSequenced(property)
? NetConstants.SequencedHeaderSize
: NetConstants.HeaderSize;
}
public int GetHeaderSize()
{
return GetHeaderSize(Property);
}
public byte[] GetPacketData()
{
int headerSize = GetHeaderSize(Property);
int dataSize = RawData.Length - headerSize;
byte[] data = new byte[dataSize];
Buffer.BlockCopy(RawData, headerSize, data, 0, dataSize);
return data;
}
public bool IsClientData()
{
var property = Property;
return property == PacketProperty.Reliable ||
property == PacketProperty.ReliableOrdered ||
property == PacketProperty.None ||
property == PacketProperty.Sequenced;
}
public static bool IsSequenced(PacketProperty property)
{
return property == PacketProperty.ReliableOrdered ||
property == PacketProperty.Reliable ||
property == PacketProperty.Sequenced ||
property == PacketProperty.Ping ||
property == PacketProperty.Pong ||
property == PacketProperty.AckReliable ||
property == PacketProperty.AckReliableOrdered;
}
public static byte[] GetUnconnectedData(byte[] raw, int count)
{
int size = count - NetConstants.HeaderSize;
byte[] data = new byte[size];
Buffer.BlockCopy(raw, 1, data, 0, size);
return data;
}
//Packet contstructor from byte array
public bool FromBytes(byte[] data, int packetSize)
{
//Reading property
if ((data[0] & 0x7F) > LastProperty || packetSize > NetConstants.PacketSizeLimit)
return false;
RawData = new byte[packetSize];
Buffer.BlockCopy(data, 0, RawData, 0, packetSize);
return true;
}
}
}