code: def _get_sizes_checksums(checksums_path):
    
    checksums = {}
    for line in _read_file(checksums_path).split('\n'):
      if not line:
        continue
      # URL might have spaces inside, but size and checksum will not.
      url, size, checksum = line.rsplit(' ', 2)
      checksums[url] = (int(size), checksum)
    return checksums
docs: Returns {URL: (size, checksum)}s stored within file.