Method ComputeBlockCount

src/par2creator.cpp:265–309

Compute block size from block count or vice versa depending on which was specified on the command line

// Compute block size from block count or vice versa depending on which was
// specified on the command line
bool Par2Creator::ComputeBlockCount(const std::vector<std::string> &extrafiles)
{
  FileSizeCache filesize_cache;

  largestfilesize = 0;
  for (std::vector<std::string>::const_iterator i=extrafiles.begin(); i!=extrafiles.end(); i++)
  {
    u64 filesize = filesize_cache.get(*i);
    if (largestfilesize < filesize)
    {
      largestfilesize = filesize;
    }
  }


  if (blocksize == 0)
  {
    serr << "ERROR: Block size was zero!" << std::endl;
    return false;
  }

  if (blocksize % 4 != 0)
  {
    serr << "ERROR: Block size was not a multiple of 4 bytes!" << std::endl;
    return false;
  }


  u64 count = 0;

  for (std::vector<std::string>::const_iterator i=extrafiles.begin(); i!=extrafiles.end(); i++)
  {
    count += (filesize_cache.get(*i) + blocksize-1) / blocksize;
  }

  if (count > 32768)
  {
    serr << "Block size is too small. It would require " << count << "blocks." << std::endl;
    return false;
  }

  sourceblockcount = (u32)count;

  return true;
}