public static IEnumerable <WorldPacket> FromBuffer(byte[] buffer, WorldPacketFlags flags = WorldPacketFlags.None, AuthCrypt crypt = null)
{
using (var ms = new MemoryStream(buffer))
using (var br = new BinaryReader(ms))
using (var bw = new BinaryWriter(ms))
{
while (ms.Position < buffer.Length)
{
var pkt = new WorldPacket();
if (flags.HasFlag(WorldPacketFlags.GUIDPrefix))
{
pkt.GUID = br.ReadUInt64();
pkt.TotalLength += 8;
}
pkt.Header = new WorldPacketHeader();
var headerSize = flags.HasFlag(WorldPacketFlags.Outbound) ? 4 : 6;
var headerBytes = br.ReadBytes(headerSize);
pkt.TotalLength += headerSize;
if (flags.HasFlag(WorldPacketFlags.EncryptedHeader) && crypt != null)
{
// We do a null check, because the first received world packet is NOT encrypted
//Console.WriteLine($"Encrypted: {string.Join(" ", headerBytes.Select(b => b.ToString("X2")))}");
crypt.Decrypt(headerBytes);
bw.Seek(-6, SeekOrigin.Current);
bw.Write(headerBytes);
//Console.WriteLine($"Decrypted: {string.Join(" ", headerBytes.Select(b => b.ToString("X2")))}");
}
pkt.Header.Length = BitConverter.ToUInt16(headerBytes, 0);
if (flags.HasFlag(WorldPacketFlags.BigEndianLength)) // Client sends 6 byte header (4-byte opcode, 2-byte length)
{
pkt.Header.Length = pkt.Header.Length.SwitchEndian(); // TODO: eew?
}
//Console.WriteLine($"Length: {pkt.Header.Length}");
// This means we have received a partial packet, can't pass that on
if (((ms.Position - headerSize + 2) + pkt.Header.Length) > buffer.Length)
{
break;
}
pkt.Header.Opcode = flags.HasFlag(WorldPacketFlags.Outbound) ?
(WorldOpcodes)BitConverter.ToUInt16(headerBytes, 2) : (WorldOpcodes)BitConverter.ToUInt32(headerBytes, 2);
//Console.WriteLine($"Opcode: {pkt.Header.Opcode}");
var payloadLength = pkt.Header.Length - (flags.HasFlag(WorldPacketFlags.Outbound) ? 2 : 4);
pkt.TotalLength += payloadLength;
pkt.Payload = new ArraySegment <byte>(buffer, (int)ms.Position, payloadLength);
yield return(pkt);
ms.Seek(payloadLength, SeekOrigin.Current);
}
}
}
public static IEnumerable<WorldPacket> FromBuffer(byte[] buffer, WorldPacketFlags flags = WorldPacketFlags.None, AuthCrypt crypt = null)
{
using (var ms = new MemoryStream(buffer))
using (var br = new BinaryReader(ms))
using (var bw = new BinaryWriter(ms))
{
while (ms.Position < buffer.Length)
{
var pkt = new WorldPacket();
if (flags.HasFlag(WorldPacketFlags.GUIDPrefix))
{
pkt.GUID = br.ReadUInt64();
pkt.TotalLength += 8;
}
pkt.Header = new WorldPacketHeader();
var headerSize = flags.HasFlag(WorldPacketFlags.Outbound) ? 4 : 6;
var headerBytes = br.ReadBytes(headerSize);
pkt.TotalLength += headerSize;
if (flags.HasFlag(WorldPacketFlags.EncryptedHeader) && crypt != null)
{
// We do a null check, because the first received world packet is NOT encrypted
//Console.WriteLine($"Encrypted: {string.Join(" ", headerBytes.Select(b => b.ToString("X2")))}");
crypt.Decrypt(headerBytes);
bw.Seek(-6, SeekOrigin.Current);
bw.Write(headerBytes);
//Console.WriteLine($"Decrypted: {string.Join(" ", headerBytes.Select(b => b.ToString("X2")))}");
}
pkt.Header.Length = BitConverter.ToUInt16(headerBytes, 0);
if (flags.HasFlag(WorldPacketFlags.BigEndianLength)) // Client sends 6 byte header (4-byte opcode, 2-byte length)
pkt.Header.Length = pkt.Header.Length.SwitchEndian(); // TODO: eew?
//Console.WriteLine($"Length: {pkt.Header.Length}");
// This means we have received a partial packet, can't pass that on
if (((ms.Position - headerSize + 2) + pkt.Header.Length) > buffer.Length)
break;
pkt.Header.Opcode = flags.HasFlag(WorldPacketFlags.Outbound) ?
(WorldOpcodes)BitConverter.ToUInt16(headerBytes, 2) : (WorldOpcodes)BitConverter.ToUInt32(headerBytes, 2);
//Console.WriteLine($"Opcode: {pkt.Header.Opcode}");
var payloadLength = pkt.Header.Length - (flags.HasFlag(WorldPacketFlags.Outbound) ? 2 : 4);
pkt.TotalLength += payloadLength;
pkt.Payload = new ArraySegment<byte>(buffer, (int)ms.Position, payloadLength);
yield return pkt;
ms.Seek(payloadLength, SeekOrigin.Current);
}
}
}
