Method Load

src/mainpacket.cpp:82–130

// Load a main packet from a specified file

bool MainPacket::Load(DiskFile *diskfile, u64 offset, PACKET_HEADER &header)
{
  // Is the packet large enough
  if (header.length < sizeof(MAINPACKET))
  {
    return false;
  }

  // Is there a whole number of fileid values
  if (0 < (header.length - sizeof(MAINPACKET)) % sizeof(MD5Hash))
  {
    return false;
  }

  // Is the packet too large
  if (header.length > sizeof(MAINPACKET) + 32768 * sizeof(MD5Hash))
  {
    return false;
  }

  // Compute the total number of entries in the fileid array
  totalfilecount = (u32)(((size_t)header.length - sizeof(MAINPACKET)) / sizeof(MD5Hash));

  MAINPACKET *packet = (MAINPACKET *)AllocatePacket((size_t)header.length);

  packet->header = header;

  // Read the rest of the packet from disk
  if (!diskfile->Read(offset + sizeof(PACKET_HEADER),
                      &packet->blocksize,
                     (size_t)packet->header.length - sizeof(PACKET_HEADER)))
    return false;

  // Does the packet have enough fileid values
  recoverablefilecount = packet->recoverablefilecount;
  if (recoverablefilecount > totalfilecount)
  {
    return false;
  }

  // Is the block size valid
  blocksize = packet->blocksize;
  if (blocksize == 0 || (blocksize & 3) != 0)
  {
    return false;
  }

  return true;
}