public override bool recv(MessageReaderBase reader, byte[] buffer, UInt32 rpos, UInt32 len)
{
if (!_blowfish.isGood())
{
Dbg.ERROR_MSG("BlowfishFilter::recv: Dropping packet, due to invalid filter");
return(false);
}
if (_packet.length() == 0 && len >= MIN_PACKET_SIZE && BitConverter.ToUInt16(buffer, (int)rpos) - 1 == len - 3)
{
int packLen = BitConverter.ToUInt16(buffer, (int)rpos) - 1;
int padSize = buffer[rpos + 2];
decrypt(buffer, (int)(rpos + 3), (int)(len - 3));
int length = packLen - padSize;
if (reader != null)
{
reader.process(buffer, rpos + 3, (UInt32)length);
}
return(true);
}
_packet.append(buffer, rpos, len);
while (_packet.length() > 0)
{
UInt32 currLen = 0;
int oldwpos = 0;
if (_packLen <= 0)
{
// 如果满足一个最小包则尝试解包, 否则缓存这个包待与下一个包合并然后解包
if (_packet.length() >= MIN_PACKET_SIZE)
{
_packLen = _packet.readUint16();
_padSize = _packet.readUint8();
_packLen -= 1;
if (_packet.length() > _packLen)
{
currLen = (UInt32)(_packet.rpos + _packLen);
oldwpos = _packet.wpos;
_packet.wpos = (int)currLen;
}
else if (_packet.length() < _packLen)
{
return(false);
}
}
else
{
return(false);
}
}
else
{
// 如果上一次有做过解包行为但包还没有完整则继续处理
// 如果包是完整的下面流程会解密， 如果有多余的内容需要将其剪裁出来待与下一个包合并
if (_packet.length() > _packLen)
{
currLen = (UInt32)(_packet.rpos + _packLen);
oldwpos = _packet.wpos;
_packet.wpos = (int)currLen;
}
else if (_packet.length() < _packLen)
{
return(false);
}
}
decrypt(_packet);
_packet.wpos -= _padSize;
// 上面的流程能保证wpos之后不会有多余的包
// 如果有多余的包数据会放在_recvStream
if (reader != null)
{
reader.process(_packet.data(), (UInt32)_packet.rpos, _packet.length());
}
if (currLen > 0)
{
_packet.rpos = (int)currLen;
_packet.wpos = oldwpos;
}
else
{
_packet.clear();
}
_packLen = 0;
_padSize = 0;
}
return(true);
}
public abstract bool recv(MessageReaderBase reader, byte[] buffer, UInt32 rpos, UInt32 len);
