1  /*
       2   * compression.h: interface to finding decompressor / compression extension
       3   *
       4   * Copyright (C) 1994, 1995 Graeme W. Wilford. (Wilf.)
       5   * Copyright (C) 2001-2022 Colin Watson.
       6   *
       7   * This file is part of man-db.
       8   *
       9   * man-db is free software; you can redistribute it and/or modify it
      10   * under the terms of the GNU General Public License as published by
      11   * the Free Software Foundation; either version 2 of the License, or
      12   * (at your option) any later version.
      13   *
      14   * man-db is distributed in the hope that it will be useful, but
      15   * WITHOUT ANY WARRANTY; without even the implied warranty of
      16   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17   * GNU General Public License for more details.
      18   *
      19   * You should have received a copy of the GNU General Public License
      20   * along with man-db; if not, write to the Free Software Foundation,
      21   * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
      22   */
      23  
      24  #include <stdbool.h>
      25  
      26  struct compression {
      27  	/* The following are const because they should be pointers to parts
      28  	 * of strings allocated elsewhere and should not be written through
      29  	 * or freed themselves.
      30  	 */
      31  	const char *prog;
      32  	const char *ext;
      33  	/* The following should be freed when discarding an instance of this
      34  	 * structure.
      35  	 */
      36  	char *stem;
      37  };
      38  
      39  extern struct compression comp_list[];
      40  
      41  extern struct compression *comp_info (const char *filename, bool want_stem);
      42  extern struct compression *comp_file (const char *filename);