1  /*****************************************************************************/
       2  /*  LibreDWG - free implementation of the DWG file format                    */
       3  /*                                                                           */
       4  /*  Copyright (C) 2018-2020 Free Software Foundation, Inc.                   */
       5  /*                                                                           */
       6  /*  This library is free software, licensed under the terms of the GNU       */
       7  /*  General Public License as published by the Free Software Foundation,     */
       8  /*  either version 3 of the License, or (at your option) any later version.  */
       9  /*  You should have received a copy of the GNU General Public License        */
      10  /*  along with this program.  If not, see <http://www.gnu.org/licenses/>.    */
      11  /*****************************************************************************/
      12  
      13  /*
      14   * unknown.c: decode unknown bitstreams
      15   * written by Reini Urban
      16   */
      17  
      18  #ifndef UNKNOWN_H
      19  #define UNKNOWN_H
      20  
      21  struct _unknown_field
      22  {
      23    int code;
      24    const char *value;
      25    unsigned char *bytes;
      26    int num_bits;
      27    Dwg_Bits type;
      28    const char *name; // in dwg.spec
      29    // number of occurrences of this type:value pair (max 1423)
      30    unsigned short num;
      31    int pos[5]; // 5x found bit offset in dxf->bytes or -1 if not found
      32    // many typical values are 5x found (handle 0, BL 2)
      33  };
      34  
      35  struct _unknown_dxf
      36  {
      37    const char *name;
      38    const char *dxf;
      39    const unsigned int handle;
      40    const char *bytes;
      41    const int is_entity;
      42    const int num_bits; // size of dumped unknown_bits TF
      43    const int commonsize;
      44    const int hdloff;
      45    const int strsize;
      46    const int hdlsize;
      47    const int bitsize;
      48    const struct _unknown_field *fields;
      49  };
      50  
      51  // dynamic helper companion
      52  struct _dxf
      53  {
      54    unsigned char *found;    // coverage per bit for found 1
      55    unsigned char *possible; // coverage for mult. finds >1
      56    int num_bits;            // copy of unknown_dxf.num_bits
      57    int num_filled;
      58    int num_empty;
      59    int num_possible;
      60    double percentage;
      61  };
      62  
      63  #endif