iso_tool ciso.c bug

  max_sector = header.total_bytes / header.block_size - 1;
-  start_sec = pos / SECTOR_SIZE;
-  end_sec = (pos + size - 1) / SECTOR_SIZE;
+  start_sec = pos / header.block_size;
+  end_sec = (pos + size - 1) / header.block_size;
  sector_num = start_sec;