uint32_t SixLowPanIphc::Deserialize()

in simulation/src/sixlowpan/model/sixlowpan-header.cc [1088:1222]
123 lines of code
24 McCabe index (conditional complexity)

uint32_t SixLowPanIphc::Deserialize (Buffer::Iterator start)
{
  Buffer::Iterator i = start;

  m_baseFormat = i.ReadNtohU16 ();

  if ( GetCid () )
    {
      m_srcdstContextId = i.ReadU8 ();
    }
  else
    {
      m_srcdstContextId = 0;
    }
  // Traffic Class and Flow Label
  switch ( GetTf () )
    {
      uint8_t temp;
    case TF_FULL:
      temp = i.ReadU8 ();
      m_ecn = temp >> 6;
      m_dscp = temp & 0x3F;
      temp = i.ReadU8 ();
      m_flowLabel = temp;
      temp = i.ReadU8 ();
      m_flowLabel = (m_flowLabel << 8) | temp;
      temp = i.ReadU8 ();
      m_flowLabel = (m_flowLabel << 8) | temp;
      break;
    case TF_DSCP_ELIDED:
      temp = i.ReadU8 ();
      m_ecn = temp >> 6;
      m_flowLabel = temp & 0x3F;
      temp = i.ReadU8 ();
      m_flowLabel = (m_flowLabel << 8) | temp;
      temp = i.ReadU8 ();
      m_flowLabel = (m_flowLabel << 8) | temp;
      break;
    case TF_FL_ELIDED:
      temp = i.ReadU8 ();
      m_ecn = temp >> 6;
      m_dscp = temp & 0x3F;
      break;
    default:
      break;
    }
  // Next Header
  if ( GetNh () == false )
    {
      m_nextHeader = i.ReadU8 ();
    }
  // Hop Limit
  switch ( GetHlim () )
    {
    case HLIM_INLINE:
      m_hopLimit = i.ReadU8 ();
      break;
    case HLIM_COMPR_1:
      m_hopLimit = 1;
      break;
    case HLIM_COMPR_64:
      m_hopLimit = 64;
      break;
    case HLIM_COMPR_255:
    default:
      m_hopLimit = 255;
      break;

    }
  // Source Address
  memset (m_srcInlinePart, 0x00, sizeof (m_srcInlinePart));
  switch (GetSam () )
    {
    case HC_INLINE:
      if ( GetSac () == false )
        {
          i.Read (m_srcInlinePart, 16);
        }
      break;
    case HC_COMPR_64:
      i.Read (m_srcInlinePart, 8);
      break;
    case HC_COMPR_16:
      i.Read (m_srcInlinePart, 2);
      break;
    case HC_COMPR_0:
    default:
      break;
    }

  // Destination Address
  memset (m_dstInlinePart, 0x00, sizeof (m_dstInlinePart));
  if ( GetM () == false)
    {
      // unicast
      switch (GetDam () )
        {
        case HC_INLINE:
          i.Read (m_dstInlinePart, 16);
          break;
        case HC_COMPR_64:
          i.Read (m_dstInlinePart, 8);
          break;
        case HC_COMPR_16:
          i.Read (m_dstInlinePart, 2);
          break;
        case HC_COMPR_0:
        default:
          break;
        }
    }
  else
    {
      // multicast
      switch (GetDam () )
        {
        case HC_INLINE:
          i.Read (m_dstInlinePart, 16);
          break;
        case HC_COMPR_64:
          i.Read (m_dstInlinePart, 6);
          break;
        case HC_COMPR_16:
          i.Read (m_dstInlinePart, 4);
          break;
        case HC_COMPR_0:
          i.Read (m_dstInlinePart, 1);
          break;
        default:
          break;
        }
    }

  return GetSerializedSize ();
}