public Packet(EQStream stream, byte[] packet, bool combined = false)
{
Baked = packet;
Opcode = packet.NetU16(0);
var off = 2;
switch ((SessionOp)Opcode)
{
case SessionOp.Ack:
case SessionOp.OutOfOrder:
case SessionOp.Single:
case SessionOp.Fragment:
case SessionOp.Combined:
var plen = packet.Length - off;
if (!combined && stream.Validating)
{
plen -= 2;
var mcrc = CalculateCRC(packet.Sub(0, packet.Length - 2), stream.CRCKey);
var pcrc = packet.NetU16(packet.Length - 2);
Valid = mcrc == pcrc;
}
if (!combined && stream.Compressing)
{
if (packet[off] == 0x5a)
{
using (var ms = new MemoryStream(packet, 3, packet.Length - 3 - 2)) {
using (var ds = new ZlibStream(ms, CompressionMode.Decompress)) {
using (var tms = new MemoryStream()) {
ds.CopyTo(tms);
packet = tms.ToArray();
plen = packet.Length;
off = 0;
}
}
}
}
else if (packet[off] == 0xa5)
{
off++;
plen--;
}
}
if ((SessionOp)Opcode != SessionOp.Combined)
{
Sequence = packet.NetU16(off);
off += 2;
plen -= 2;
}
Data = packet.Sub(off, off + plen);
Bare = false;
break;
default:
Data = packet.Sub(2);
Bare = true;
break;
}
}
public virtual byte[] Bake(EQStream stream)
{
if (Baked != null)
{
return(Baked);
}
if (Bare)
{
Baked = new byte[Data.Length + 2];
Baked[0] = (byte)(Opcode >> 8);
Baked[1] = (byte)Opcode;
Array.Copy(Data, 0, Baked, 2, Data.Length);
}
else
{
var len = Data.Length + 2 + 2;
if (stream.Compressing)
{
len++;
}
if (sequenced)
{
len += 2;
}
Baked = new byte[len];
Baked[0] = (byte)(Opcode >> 8);
Baked[1] = (byte)Opcode;
var off = 2;
var doCompress = false;
if (!doCompress && stream.Compressing)
{
Baked[off++] = 0xa5;
}
if (sequenced)
{
Baked[off++] = (byte)(sequence >> 8);
Baked[off++] = (byte)sequence;
}
Array.Copy(Data, 0, Baked, off, Data.Length);
off += Data.Length;
if (doCompress && stream.Compressing)
{
using (var ms = new MemoryStream()) {
using (var ds = new ZlibStream(ms, CompressionMode.Compress)) {
ds.Write(Baked, 2, off - 2);
ds.Flush();
}
var temp = ms.ToArray();
var temp2 = new byte[3 + temp.Length + 2];
Array.Copy(Baked, temp2, 3);
temp2[2] = 0x5a;
Array.Copy(temp, 0, temp2, 3, temp.Length);
Baked = temp2;
off = temp.Length + 3;
}
}
if (stream.Validating)
{
var crc = CalculateCRC(Baked.Sub(0, off), stream.CRCKey);
Baked[off++] = (byte)(crc >> 8);
Baked[off++] = (byte)crc;
}
else
{
Baked[off++] = 0;
Baked[off++] = 0;
}
}
return(Baked);
}
