cpp network module LengthPrefixCodec has a bug

[morphad]

when using ignite cpp thin client, we find a bug of LengthPrefixCodec::Decode function, in file modules/platforms/cpp/network/src/network/length_prefix_codec.cpp

1. a call of LengthPrefixCodec::Decode with data length of 3, the packetSize reset to -1, and the packet length will be 3
2. following call, will enter first if, and the packet length of 3 reset to 0, the packet last 3 byte data will be lost

DataBuffer LengthPrefixCodec::Decode(DataBuffer& data)
        {
            if (packet.IsValid() && packet.Get()->Length() == (PACKET_HEADER_SIZE + packetSize))
            {
                packetSize = -1;
                packet.Get()->Length(0);
            }

            if (packetSize < 0)
            {
                Consume(data, PACKET_HEADER_SIZE);

                if (packet.Get()->Length() < PACKET_HEADER_SIZE)
                    return DataBuffer();

                packetSize = impl::binary::BinaryUtils::ReadInt32(*packet.Get(), 0);
            }

            Consume(data, PACKET_HEADER_SIZE + packetSize);

            if (packet.Get()->Length() == (PACKET_HEADER_SIZE + packetSize))
                return DataBuffer(packet, 0, PACKET_HEADER_SIZE + packetSize);

            return DataBuffer();
        }

can be fix as :

        DataBuffer LengthPrefixCodec::Decode(DataBuffer& data)
        {
            if (packet.IsValid() && packetSize != -1 && packet.Get()->Length() == (PACKET_HEADER_SIZE + packetSize))
            {
                packetSize = -1;
                packet.Get()->Length(0);
            }