connectionbase.cxx

一个著名的SIP协议栈

                  
                  bytesRead = overHang;
                  goto start;
               }
            }
         }
         break;
      }
      case PartialBody:
      {
         size_t contentLength = 0;

         try
         {
             contentLength = mMessage->header(h_ContentLength).value();
         }
         catch(resip::ParseBuffer::Exception& e)
         {
            WarningLog(<<"Malformed Content-Length in connection-based transport"
                        ". Not much we can do to fix this. " << e);
            // !bwc! Bad Content-Length. We are hosed.
            delete [] mBuffer;
            mBuffer = 0;
            delete mMessage;
            mMessage = 0;
            //.jacob. Shouldn't the state also be set here?
            delete this;
            return;
         }

         mBufferPos += bytesRead;
         if (mBufferPos == contentLength)
         {
            mMessage->addBuffer(mBuffer);
            mMessage->setBody(mBuffer, contentLength);
            if (!transport()->basicCheck(*mMessage))
            {
               delete mMessage;
               mMessage = 0;
            }
            else
            {
               DebugLog(<< "##ConnectionBase: " << *this << " received: " << *mMessage);

               Transport::stampReceived(mMessage);
               fifo.add(mMessage);
               mMessage = 0;
            }
            mConnState = NewMessage;
            mBuffer = 0;            
         }
         break;
      }
      default:
         assert(0);
   }
}

#ifdef USE_SIGCOMP
void
ConnectionBase::decompressNewBytes(int bytesRead,
                                   Fifo<TransactionMessage>& fifo)
{
  mConnState = SigComp;

  if (!mSigcompFramer)
  {
    mSigcompFramer = new osc::TcpStream();
  }

  mSigcompFramer->addData(mBuffer, bytesRead);
  size_t bytesUncompressed;
  osc::StateChanges *sc = 0;
  char *uncompressed = new char[65536];
  while ((bytesUncompressed = mSigcompStack->uncompressMessage(
                *mSigcompFramer, uncompressed, 65536, sc)) > 0)
  {
    DebugLog (<< "Uncompressed Connection-oriented message");
    mMessage = new SipMessage(mWho.transport);

    mMessage->setSource(mWho);
    mMessage->setTlsDomain(mWho.transport->tlsDomain());

    char *sipBuffer = new char[bytesUncompressed];
    memmove(sipBuffer, uncompressed, bytesUncompressed);
    mMessage->addBuffer(sipBuffer);
    mMsgHeaderScanner.prepareForMessage(mMessage);
    char *unprocessedCharPtr;
    if (mMsgHeaderScanner.scanChunk(sipBuffer,
                                    bytesUncompressed,
                                    &unprocessedCharPtr) !=
        MsgHeaderScanner::scrEnd)
    {
       StackLog(<<"Scanner rejecting compressed message as unparsable");
       StackLog(<< Data(sipBuffer, bytesUncompressed));
       delete mMessage;
       mMessage=0;
    }
  
    unsigned int used = unprocessedCharPtr - sipBuffer;
    if (mMessage && (used < bytesUncompressed))
    {
      mMessage->setBody(sipBuffer+used, bytesUncompressed-used);
    }

    if (mMessage && !transport()->basicCheck(*mMessage))
    {
      delete mMessage;
      mMessage = 0;
    }

    if (mMessage)
    {
      Transport::stampReceived(mMessage);
      // If the message made it this far, we should let it store
      // SigComp state: extract the compartment ID.
      const Via &via = mMessage->header(h_Vias).front();
      if (mMessage->isRequest())
      {
        // For requests, the compartment ID is read out of the
        // top via header field; if not present, we use the
        // TCP connection for identification purposes.
        if (via.exists(p_sigcompId))
        {
          Data compId = via.param(p_sigcompId);
          mSigcompStack->provideCompartmentId(sc, compId.data(), compId.size());
        }
        else
        {
          mSigcompStack->provideCompartmentId(sc, this, sizeof(this));
        }
      }
      else
      {
        // For responses, the compartment ID is supposed to be
        // the same as the compartment ID of the request. We
        // *could* dig down into the transaction layer to try to
        // figure this out, but that's a royal pain, and a rather
        // severe layer violation. In practice, we're going to ferret
        // the ID out of the the Via header field, which is where we
        // squirreled it away when we sent this request in the first place.
        Data compId = via.param(p_branch).getSigcompCompartment();
        mSigcompStack->provideCompartmentId(sc, compId.data(), compId.size());
      }
      fifo.add(mMessage);
      mMessage = 0;
      sc = 0;
    }
    else
    {
      delete sc;
      sc = 0;
    }
  }
  delete uncompressed;

  // If there was a decompression failure, let the other side know.
  osc::SigcompMessage *nack = mSigcompStack->getNack();
  if (nack)
  {
    if (mSendingTransmissionFormat == Compressed)
    {
      mOutstandingSends.push_back(new SendData(
                   who(),
                   Data(nack->getStreamMessage(), nack->getStreamLength()),
                   Data::Empty,
                   Data::Empty,
                   true));
    }
    else
    {
      delete nack;
    }
  }
}
#endif
            
std::pair<char*, size_t> 
ConnectionBase::getWriteBuffer()
{
   if (mConnState == NewMessage)
   {
      if (mBuffer)
      {
	 delete [] mBuffer;
      }

      DebugLog (<< "Creating buffer for " << *this);

      mBuffer = MsgHeaderScanner::allocateBuffer(ConnectionBase::ChunkSize);
      mBufferSize = ConnectionBase::ChunkSize;
      mBufferPos = 0;
   }
   return std::make_pair(mBuffer + mBufferPos, mBufferSize - mBufferPos);
}

char*
ConnectionBase::getWriteBufferForExtraBytes(int extraBytes)
{
   char* buffer = MsgHeaderScanner::allocateBuffer(mBufferSize + extraBytes);
   memcpy(buffer, mBuffer, mBufferSize);
   delete [] mBuffer;
   mBuffer = buffer;
   buffer += mBufferSize;
   mBufferSize += extraBytes;
   return buffer;
}
            
void 
ConnectionBase::setBuffer(char* bytes, int count)
{
   mBuffer = bytes;
   mBufferPos = 0;
   mBufferSize = count;
}

Transport* 
ConnectionBase::transport()
{
   assert(this);
   return mWho.transport;
}

std::ostream& 
resip::operator<<(std::ostream& strm, 
                  const resip::ConnectionBase& c)

{
   strm << "CONN_BASE: " << &c << " " << c.mWho;
   return strm;
}

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