zip_set_archive_flag —
    set zip archive flag
#include
  <zip.h>
int
  
  zip_set_archive_flag(zip_t
    *archive, zip_flags_t
    flag, int
  value);
The
    zip_set_archive_flag()
    function sets the flag flag for the archive
    archive to the value value.
Supported flags are:
  ZIP_AFL_CREATE_OR_KEEP_FILE_FOR_EMPTY_ARCHIVE 
  - If this flag is cleared, the archive file will be removed if the archive
      is empty. If it is set, an empty archive will be created, which is not
      recommended by the zip specification.
 
  ZIP_AFL_RDONLY 
  - If this flag is set, no modification to the archive are allowed. This flag
      can only be cleared if it was manually set with
      
zip_set_archive_flag, not if the archive was
      opened read-only. 
  ZIP_AFL_WANT_TORRENTZIP 
  - If this flag is set, the archive will be written in torrentzip
    format.
 
Upon successful completion 0 is returned, and -1 if an error
    occurred.
zip_set_archive_flag() was added in libzip
    0.9. In libzip 0.11 the type of flag was changed from
    int to zip_flags_t.
    ZIP_AFL_CREATE_OR_KEEP_FILE_FOR_EMPTY_ARCHIVE and
    ZIP_AFL_WANT_TORRENTZIP were added in libzip
  1.10.0.