private static int getMaxSpaceCount(PackageEntry[] entries, int b1, int b2) {
    int start = Math.min(b1, b2);
    int end = Math.max(b1, b2);

    if (start == -1) return 0;

    int max = 0;
    int cur = 0;
    for (int i = start; i < end; i++) {
      if (entries[i] == PackageEntry.BLANK_LINE_ENTRY) {
        cur++;
      }
      else {
        max = Math.max(max, cur);
        cur = 0;
      }
    }
    max = Math.max(max, cur);
    return max;
  }
private static int getMaxSpaceCount(PackageEntry[] entries, int b1, int b2)