File size: 4,558 Bytes
27123f4 | 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 | namespace SilkroadBot.Core.Networking;
/// <summary>
/// Represents a Silkroad packet with opcode and payload.
/// </summary>
public class Packet
{
public ushort Opcode { get; }
public byte[] Payload { get; }
public bool IsEncrypted { get; }
public DateTime Timestamp { get; }
public PacketDirection Direction { get; }
public Packet(ushort opcode, byte[] payload, PacketDirection direction, bool isEncrypted = false)
{
Opcode = opcode;
Payload = payload ?? Array.Empty<byte>();
IsEncrypted = isEncrypted;
Timestamp = DateTime.UtcNow;
Direction = direction;
}
/// <summary>Create a client-to-server packet.</summary>
public static Packet ToServer(ushort opcode, byte[] payload, bool encrypted = false)
=> new(opcode, payload, PacketDirection.ClientToServer, encrypted);
/// <summary>Create a server-to-client packet.</summary>
public static Packet FromServer(ushort opcode, byte[] payload, bool encrypted = false)
=> new(opcode, payload, PacketDirection.ServerToClient, encrypted);
public override string ToString() => $"[{Direction}] 0x{Opcode:X4} ({Payload.Length} bytes)";
}
public enum PacketDirection
{
ClientToServer,
ServerToClient
}
/// <summary>
/// Packet reader utility for extracting data from packet payloads.
/// </summary>
public class PacketReader
{
private readonly byte[] _data;
private int _position;
public PacketReader(byte[] data)
{
_data = data;
_position = 0;
}
public int Remaining => _data.Length - _position;
public int Position => _position;
public byte ReadByte() => _data[_position++];
public ushort ReadUInt16()
{
var value = BitConverter.ToUInt16(_data, _position);
_position += 2;
return value;
}
public uint ReadUInt32()
{
var value = BitConverter.ToUInt32(_data, _position);
_position += 4;
return value;
}
public ulong ReadUInt64()
{
var value = BitConverter.ToUInt64(_data, _position);
_position += 8;
return value;
}
public float ReadSingle()
{
var value = BitConverter.ToSingle(_data, _position);
_position += 4;
return value;
}
public string ReadAscii()
{
ushort length = ReadUInt16();
var text = System.Text.Encoding.ASCII.GetString(_data, _position, length);
_position += length;
return text;
}
public string ReadUnicode()
{
ushort length = ReadUInt16();
var text = System.Text.Encoding.Unicode.GetString(_data, _position, length * 2);
_position += length * 2;
return text;
}
public byte[] ReadBytes(int count)
{
var bytes = new byte[count];
Array.Copy(_data, _position, bytes, 0, count);
_position += count;
return bytes;
}
public void Skip(int count) => _position += count;
}
/// <summary>
/// Packet writer utility for constructing packet payloads.
/// </summary>
public class PacketWriter
{
private readonly MemoryStream _stream;
public PacketWriter(int initialCapacity = 64)
{
_stream = new MemoryStream(initialCapacity);
}
public PacketWriter WriteByte(byte value) { _stream.WriteByte(value); return this; }
public PacketWriter WriteUInt16(ushort value)
{
_stream.Write(BitConverter.GetBytes(value));
return this;
}
public PacketWriter WriteUInt32(uint value)
{
_stream.Write(BitConverter.GetBytes(value));
return this;
}
public PacketWriter WriteUInt64(ulong value)
{
_stream.Write(BitConverter.GetBytes(value));
return this;
}
public PacketWriter WriteSingle(float value)
{
_stream.Write(BitConverter.GetBytes(value));
return this;
}
public PacketWriter WriteAscii(string text)
{
var bytes = System.Text.Encoding.ASCII.GetBytes(text);
WriteUInt16((ushort)bytes.Length);
_stream.Write(bytes);
return this;
}
public PacketWriter WriteUnicode(string text)
{
var bytes = System.Text.Encoding.Unicode.GetBytes(text);
WriteUInt16((ushort)(bytes.Length / 2));
_stream.Write(bytes);
return this;
}
public PacketWriter WriteBytes(byte[] data) { _stream.Write(data); return this; }
public byte[] ToArray() => _stream.ToArray();
}
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