| 37 | } |
| 38 | |
| 39 | bool CPacketChunkUnpacker::UnpackNextChunk(CNetChunk *pChunk) |
| 40 | { |
| 41 | if(!m_Valid) |
| 42 | { |
| 43 | return false; |
| 44 | } |
| 45 | |
| 46 | const unsigned char *const pEnd = m_Data.m_aChunkData + m_Data.m_DataSize; |
| 47 | |
| 48 | while(true) |
| 49 | { |
| 50 | if(m_CurrentChunk >= m_Data.m_NumChunks) |
| 51 | { |
| 52 | m_Valid = false; |
| 53 | return false; |
| 54 | } |
| 55 | |
| 56 | unsigned char *pData = m_Data.m_aChunkData; |
| 57 | |
| 58 | // TODO: add checking here so we don't read too far |
| 59 | const int HeaderSplit = m_pConnection->m_Sixup ? 6 : 4; |
| 60 | for(int i = 0; i < m_CurrentChunk; i++) |
| 61 | { |
| 62 | CNetChunkHeader SkippedHeader; |
| 63 | pData = SkippedHeader.Unpack(pData, HeaderSplit); |
| 64 | pData += SkippedHeader.m_Size; |
| 65 | } |
| 66 | |
| 67 | // unpack the header |
| 68 | CNetChunkHeader Header; |
| 69 | pData = Header.Unpack(pData, HeaderSplit); |
| 70 | m_CurrentChunk++; |
| 71 | |
| 72 | if(pData + Header.m_Size > pEnd) |
| 73 | { |
| 74 | m_Valid = false; |
| 75 | return false; |
| 76 | } |
| 77 | |
| 78 | // handle sequence stuff |
| 79 | if((Header.m_Flags & NET_CHUNKFLAG_VITAL) != 0) |
| 80 | { |
| 81 | // anti spoof: ignore unknown sequence |
| 82 | if(Header.m_Sequence == (m_pConnection->m_Ack + 1) % NET_MAX_SEQUENCE || m_pConnection->m_UnknownSeq) |
| 83 | { |
| 84 | m_pConnection->m_UnknownSeq = false; |
| 85 | |
| 86 | // in sequence |
| 87 | m_pConnection->m_Ack = Header.m_Sequence; |
| 88 | } |
| 89 | else |
| 90 | { |
| 91 | // old packet that we already got |
| 92 | if(CNetBase::IsSeqInBackroom(Header.m_Sequence, m_pConnection->m_Ack)) |
| 93 | continue; |
| 94 | |
| 95 | // out of sequence, request resend |
| 96 | if(g_Config.m_Debug) |
no test coverage detected