Geografic-Information-System/lib/vector/diglib/plus_struct.c

/*
****************************************************************************
*
* MODULE:       Vector library 
*   	    	
* AUTHOR(S):    Dave Gerdes, CERL.
*               Update to GRASS 5.7 Radim Blazek.
*
* PURPOSE:      Lower level functions for reading/writing/manipulating vectors.
*
* COPYRIGHT:    (C) 2001 by the GRASS Development Team
*
*               This program is free software under the GNU General Public
*   	    	License (>=v2). Read the file COPYING that comes with GRASS
*   	    	for details.
*
*****************************************************************************/
#include <string.h>
#include <grass/gis.h>
#include <grass/Vect.h>

/*
* Routines for reading and writing Dig+ structures.
* return 0 on success, -1 on failure of whatever kind
* if you dont want it written out, then dont call these routines
* ie  check for deleted status before calling a write routine
* in as much as it would be nice to hide that code in here,
* this is a library routine and we chose to make it dependant on
* as few external files as possible 
*/

/*  These routines assume ptr->alloc_lines  is valid 
*   Make sure it is initialized before calling 
*/

/*
*  Internally, my default variables for lines/areas/nodes/isles  are type
*  plus_t  which is typedefed as short.  This limits the current version
*  to no more than 32K lines, nodes etc. (excluding points)
*  All in the name of future expansion, I have converted these values to 
*  longs in the dig_plus data file.
*
*  NOTE: 3.10 changes plus_t to  ints.
*    This assumes that any reasonable machine will use 4 bytes to
*    store an int.  The mapdev code is not guaranteed to work if
*    plus_t is changed to a type that is larger than an int.
*/

int 
dig_Rd_P_node (
		  struct Plus_head *Plus,
		  int  n,
		  GVFILE * fp)
{
  int cnt, n_edges;
  P_NODE *ptr;

  G_debug (3, "dig_Rd_P_node()");
  
  
  if (0 >= dig__fread_port_P (&cnt, 1, fp))
    return (-1);

  if ( cnt == 0 ) { /* dead */
      G_debug (3, "    node is dead");
      Plus->Node[n] = NULL ;
      return 0;
  }
      
  ptr = dig_alloc_node();
  ptr->n_lines = cnt;

  if ( dig_node_alloc_line ( ptr, ptr->n_lines) == -1)
     return -1; 

  if (ptr->n_lines) {
      if (0 >= dig__fread_port_P (ptr->lines, ptr->n_lines, fp))
	return (-1);
      if (0 >= dig__fread_port_F (ptr->angles, ptr->n_lines, fp))
	return (-1);
  }

  if ( Plus->with_z )
      if (0 >= dig__fread_port_P (&n_edges, 1, fp)) /* reserved for edges */
	  return (-1);

  /* here will be edges */

  if (0 >= dig__fread_port_D (&(ptr->x), 1, fp))
    return (-1);
  if (0 >= dig__fread_port_D (&(ptr->y), 1, fp))
    return (-1);

  if ( Plus->with_z ) {
    if (0 >= dig__fread_port_D (&(ptr->z), 1, fp))
      return (-1);
  } else
      ptr->z = 0;
  
  
  Plus->Node[n] = ptr;

  return (0);
}

int 
dig_Wr_P_node (
		  struct Plus_head *Plus,
		  int  n,
		  GVFILE * fp)
{
  int i, n_edges = 0;
  P_NODE *ptr; 

  G_debug (3, "dig_Wr_P_node()");
  ptr = Plus->Node[n];

  /* If NULL i.e. dead write just 0 instead of number of lines */
  if ( ptr == NULL ) { 
      G_debug (3, "    node is dead -> write 0 only");
      i = 0;
      if (0 >= dig__fwrite_port_P (&i, 1, fp))
          return (-1);
      return 0;
  }
  
  if (0 >= dig__fwrite_port_P (&(ptr->n_lines), 1, fp))
    return (-1);

  if (ptr->n_lines)
    {
      if (0 >= dig__fwrite_port_P (ptr->lines, ptr->n_lines, fp))
	return (-1);
      if (0 >= dig__fwrite_port_F (ptr->angles, ptr->n_lines, fp))
	return (-1);
    }

  if ( Plus->with_z )                       
      if (0 >= dig__fwrite_port_P (&n_edges, 1, fp))  /* reserved for edges */
          return (-1);

  /* here will be edges */
  
  if (0 >= dig__fwrite_port_D (&(ptr->x), 1, fp))
    return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->y), 1, fp))
    return (-1);

  if ( Plus->with_z )
    if (0 >= dig__fwrite_port_D (&(ptr->z), 1, fp))
      return (-1);
  
  return (0);
}

int 
dig_Rd_P_line ( struct Plus_head *Plus, int  n, GVFILE * fp)
{
  int n_edges, vol;
  char  tp;
  P_LINE *ptr; 
  P_NODE *Node;

  G_debug (3, "dig_Rd_P_line()");

  if (0 >= dig__fread_port_C (&tp, 1, fp))
    return (-1);

  if ( tp == 0 ) { /* dead */
      G_debug (3, "    line is dead");
      Plus->Line[n] = NULL ;
      return 0;
  }

  ptr = dig_alloc_line();

  ptr->type = dig_type_from_store ( tp );
  G_debug (5, "    line type  %d -> %d", tp, ptr->type);
  
  if (0 >= dig__fread_port_L (&(ptr->offset), 1, fp)) return (-1);

  /* First node */
  if ( ptr->type & ( GV_POINTS | GV_LINES | GV_KERNEL ) )
    if (0 >= dig__fread_port_P (&(ptr->N1), 1, fp)) return -1;
  
  /* Second node, for points/centroids not needed */
  if ( ptr->type & (GV_LINE | GV_BOUNDARY ) ) {
      if (0 >= dig__fread_port_P (&(ptr->N2), 1, fp)) return -1;
  } else if ( ptr->type & (GV_POINTS | GV_KERNEL ) )
      ptr->N2 = ptr->N1;
  
  /* left area for boundary, area for centroid */
  if ( ptr->type & (GV_BOUNDARY | GV_CENTROID) ) 
    if (0 >= dig__fread_port_P (&(ptr->left), 1, fp)) return -1;

  /* right area */
  if ( ptr->type & GV_BOUNDARY ) 
    if (0 >= dig__fread_port_P (&(ptr->right), 1, fp)) return -1;

  if ( (ptr->type & GV_FACE) && Plus->with_z  ) {  /* reserved for face edges */ 
    if (0 >= dig__fread_port_I (&n_edges, 1, fp)) return -1;

    /* here will be list of edges */

    /* left / right volume */
    if (0 >= dig__fread_port_P (&vol, 1, fp)) return -1;
    if (0 >= dig__fread_port_P (&vol, 1, fp)) return -1;
  }

  if ( (ptr->type & GV_KERNEL) && Plus->with_z  )  /* reserved for kernel (volume number) */
      if (0 >= dig__fread_port_P (&vol, 1, fp)) return -1;
  
  /* Bounding box */
  if ( ptr->type & (GV_LINE | GV_BOUNDARY | GV_FACE ) ) { 
    if (0 >= dig__fread_port_D (&(ptr->N), 1, fp)) return -1;
    if (0 >= dig__fread_port_D (&(ptr->S), 1, fp)) return -1;
    if (0 >= dig__fread_port_D (&(ptr->E), 1, fp)) return -1;
    if (0 >= dig__fread_port_D (&(ptr->W), 1, fp)) return -1;

    if ( Plus->with_z ) {
      if (0 >= dig__fread_port_D (&(ptr->T), 1, fp)) return -1;
      if (0 >= dig__fread_port_D (&(ptr->B), 1, fp)) return -1;
    } else {
        ptr->T = 0.0;
	ptr->B = 0.0;
    }
  } else {
    Node = Plus->Node[ptr->N1];
    ptr->N = Node->y;
    ptr->S = Node->y;
    ptr->E = Node->x;
    ptr->W = Node->x;
    ptr->T = Node->z;
    ptr->B = Node->z;
  }
  
  Plus->Line[n] = ptr;
  return (0);
}

int 
dig_Wr_P_line (
		  struct Plus_head *Plus,
		  int  n,
		  GVFILE * fp)
{
  int  n_edges = 0, vol = 0;
  char ch;
  P_LINE *ptr; 

  G_debug (4, "dig_Wr_P_line() line = %d", n);
  
  ptr = Plus->Line[n];
  
  /* If NULL i.e. dead write just 0 instead of type */
  if ( ptr == NULL ) { 
      G_debug (3, "    line is dead -> write 0 only");
      ch = 0;
      if (0 >= dig__fwrite_port_C (&ch, 1, fp)) return (-1);
      return 0;
  }
  
  ch = (char) dig_type_to_store ( ptr->type ); 
  G_debug (5, "    line type  %d -> %d", ptr->type, ch);
  if (0 >= dig__fwrite_port_C (&ch, 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_L (&(ptr->offset), 1, fp)) return (-1);

  /* First node */
  if ( ptr->type & ( GV_POINTS | GV_LINES | GV_KERNEL ) )
    if (0 >= dig__fwrite_port_P (&(ptr->N1), 1, fp)) return (-1);
  
  /* Second node, for points/centroids not needed */
  if ( ptr->type & (GV_LINE | GV_BOUNDARY ) ) 
      if (0 >= dig__fwrite_port_P (&(ptr->N2), 1, fp)) return (-1);
  
  /* left area for boundary, area for centroid */
  if ( ptr->type & (GV_BOUNDARY | GV_CENTROID) ) 
    if (0 >= dig__fwrite_port_P (&(ptr->left), 1, fp)) return (-1);

  /* right area */
  if ( ptr->type & GV_BOUNDARY ) 
    if (0 >= dig__fwrite_port_P (&(ptr->right), 1, fp)) return (-1);

  if ( (ptr->type & GV_FACE) && Plus->with_z  ) {  /* reserved for face */
      if (0 >= dig__fwrite_port_I (&n_edges, 1, fp)) return (-1);

      /* here will be list of edges */

      /* left / right volume */
      if (0 >= dig__fwrite_port_P (&vol, 1, fp)) return (-1);
      if (0 >= dig__fwrite_port_P (&vol, 1, fp)) return (-1);
  }

  if ( (ptr->type & GV_KERNEL) && Plus->with_z  )  /* reserved for kernel (volume number) */
      if (0 >= dig__fwrite_port_P (&vol, 1, fp)) return (-1);

  /* Bounding box */
  if ( ptr->type & (GV_LINE | GV_BOUNDARY | GV_FACE ) ) {
    if (0 >= dig__fwrite_port_D (&(ptr->N), 1, fp)) return (-1);
    if (0 >= dig__fwrite_port_D (&(ptr->S), 1, fp)) return (-1);
    if (0 >= dig__fwrite_port_D (&(ptr->E), 1, fp)) return (-1);
    if (0 >= dig__fwrite_port_D (&(ptr->W), 1, fp)) return (-1);

    if ( Plus->with_z ) {
      if (0 >= dig__fwrite_port_D (&(ptr->T), 1, fp)) return (-1);
      if (0 >= dig__fwrite_port_D (&(ptr->B), 1, fp)) return (-1);
    }
  }

  return (0);
}

int 
dig_Rd_P_area (
		  struct Plus_head *Plus,
		  int  n,
		  GVFILE * fp)
{
  int cnt;
  P_AREA *ptr; 
#ifdef GDEBUG
  G_debug (3, "dig_Rd_P_area(): n = %d", n );
#endif

  if (0 >= dig__fread_port_P (&cnt, 1, fp))
    return (-1);

  if ( cnt == 0 ) { /* dead */
      Plus->Area[n] = NULL ;
      return 0;
  }
      
  ptr = dig_alloc_area();

  /* lines */
  ptr->n_lines = cnt;
   
  if ( dig_area_alloc_line ( ptr, ptr->n_lines) == -1) return -1; 
  
  if (ptr->n_lines)
    if (0 >= dig__fread_port_P (ptr->lines, ptr->n_lines, fp)) return -1;

  /* isles */
  if (0 >= dig__fread_port_P (&(ptr->n_isles), 1, fp)) return -1;

  if ( dig_area_alloc_isle ( ptr, ptr->n_isles) == -1) return -1; 

  if (ptr->n_isles)
    if (0 >= dig__fread_port_P (ptr->isles, ptr->n_isles, fp)) return -1;

  /* centroid */
  if (0 >= dig__fread_port_P (&(ptr->centroid), 1, fp)) return -1;

  if (0 >= dig__fread_port_D (&(ptr->N), 1, fp)) return -1;
  if (0 >= dig__fread_port_D (&(ptr->S), 1, fp)) return -1;
  if (0 >= dig__fread_port_D (&(ptr->E), 1, fp)) return -1;
  if (0 >= dig__fread_port_D (&(ptr->W), 1, fp)) return -1;

  if ( Plus->with_z ) {
    if (0 >= dig__fread_port_D (&(ptr->T), 1, fp)) return -1;
    if (0 >= dig__fread_port_D (&(ptr->B), 1, fp)) return -1;
  } else {
      ptr->T = 0.0;
      ptr->B = 0.0;
  }

  Plus->Area[n] = ptr;
  
  return (0);
}

int 
dig_Wr_P_area (   struct Plus_head *Plus,
		  int  n,
		  GVFILE * fp)
{
  int i;
  P_AREA *ptr; 

  ptr = Plus->Area[n];
  
  /* If NULL i.e. dead write just 0 instead of number of lines */
  if ( ptr == NULL ) { 
      i = 0;
      if (0 >= dig__fwrite_port_P (&i, 1, fp)) return (-1);
      return 0;
  }
  
  /* lines */
  if (0 >= dig__fwrite_port_P (&(ptr->n_lines), 1, fp)) return (-1);
  
  if (ptr->n_lines)
    if (0 >= dig__fwrite_port_P (ptr->lines, ptr->n_lines, fp)) return -1;

  /* isles */
  if (0 >= dig__fwrite_port_P (&(ptr->n_isles), 1, fp)) return (-1);

  if (ptr->n_isles)
    if (0 >= dig__fwrite_port_P (ptr->isles, ptr->n_isles, fp)) return -1;

  /* centroid */
  if (0 >= dig__fwrite_port_P (&(ptr->centroid), 1, fp)) return (-1);

  if (0 >= dig__fwrite_port_D (&(ptr->N), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->S), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->E), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->W), 1, fp)) return (-1);

  if ( Plus->with_z ) {
    if (0 >= dig__fwrite_port_D (&(ptr->T), 1, fp)) return (-1);
    if (0 >= dig__fwrite_port_D (&(ptr->B), 1, fp)) return (-1);
  }

  return (0);
}

int 
dig_Rd_P_isle (	  struct Plus_head *Plus,
		  int  n,
		  GVFILE * fp)
{
  int cnt;
  P_ISLE *ptr; 
#ifdef GDEBUG
  G_debug (3, "dig_Rd_P_isle()");
#endif

  if (0 >= dig__fread_port_P (&cnt, 1, fp))
    return (-1);

  if ( cnt == 0 ) { /* dead */
      Plus->Isle[n] = NULL ;
      return 0;
  }
  
  ptr = dig_alloc_isle();

  /* lines */
  ptr->n_lines = cnt;

  if ( dig_isle_alloc_line ( ptr, ptr->n_lines) == -1) return -1;
  
  if (ptr->n_lines)
    if (0 >= dig__fread_port_P (ptr->lines, ptr->n_lines, fp)) return -1;

  /* area */
  if (0 >= dig__fread_port_P (&(ptr->area), 1, fp)) return -1;
  
  if (0 >= dig__fread_port_D (&(ptr->N), 1, fp)) return -1;
  if (0 >= dig__fread_port_D (&(ptr->S), 1, fp)) return -1;
  if (0 >= dig__fread_port_D (&(ptr->E), 1, fp)) return -1;
  if (0 >= dig__fread_port_D (&(ptr->W), 1, fp)) return -1;

  if ( Plus->with_z ) {
    if (0 >= dig__fread_port_D (&(ptr->T), 1, fp)) return -1;
    if (0 >= dig__fread_port_D (&(ptr->B), 1, fp)) return -1;
  } else {
      ptr->T = 0.0;
      ptr->B = 0.0;
  }

  Plus->Isle[n] = ptr;
  
  return (0);
}

int 
dig_Wr_P_isle (
		  struct Plus_head *Plus,
		  int  n,
		  GVFILE * fp)
{
  int i;
  P_ISLE *ptr; 

  ptr = Plus->Isle[n];
  
  /* If NULL i.e. dead write just 0 instead of number of lines */
  if ( ptr == NULL ) { 
      i = 0;
      if (0 >= dig__fwrite_port_P (&i, 1, fp)) return (-1);
      return 0;
  }
  
  /* lines */
  if (0 >= dig__fwrite_port_P (&(ptr->n_lines), 1, fp)) return (-1);

  if (ptr->n_lines)
    if (0 >= dig__fwrite_port_P (ptr->lines, ptr->n_lines, fp)) return -1;
  
  /* area */
  if (0 >= dig__fwrite_port_P (&(ptr->area), 1, fp)) return (-1);

  if (0 >= dig__fwrite_port_D (&(ptr->N), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->S), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->E), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->W), 1, fp)) return (-1);

  if ( Plus->with_z ) {
    if (0 >= dig__fwrite_port_D (&(ptr->T), 1, fp)) return (-1);
    if (0 >= dig__fwrite_port_D (&(ptr->B), 1, fp)) return (-1);
  }

  return (0);
}

/*
 \return -1 error
 \return  0 OK 
*/
int 
dig_Rd_Plus_head (   GVFILE * fp,
		     struct Plus_head *ptr)
{
  unsigned char buf[5];
  int byte_order;

  dig_rewind (fp);

  /* bytes 1 - 5 */
  if (0 >= dig__fread_port_C (buf, 5, fp)) return (-1);
  ptr->Version_Major = buf[0];
  ptr->Version_Minor = buf[1];
  ptr->Back_Major    = buf[2];
  ptr->Back_Minor    = buf[3];
  byte_order         = buf[4];
  
  G_debug (2, "Topo header: file version %d.%d , supported from GRASS version %d.%d",
               ptr->Version_Major, ptr->Version_Minor, ptr->Back_Major, ptr->Back_Minor );

  G_debug (2, "  byte order %d", byte_order );

  /* check version numbers */
  if ( ptr->Version_Major > GV_TOPO_VER_MAJOR || ptr->Version_Minor > GV_TOPO_VER_MINOR ) {
      /* The file was created by GRASS library with higher version than this one */
      
      if ( ptr->Back_Major > GV_TOPO_VER_MAJOR || ptr->Back_Minor > GV_TOPO_VER_MINOR ) {
	  /* This version of GRASS lib is lower than the oldest which can read this format */
	  G_fatal_error ( "Topology format version %d.%d is not supported by this release."
		          " Try to rebuild topology or upgrade GRASS.", 
			   ptr->Version_Major, ptr->Version_Minor);
	  return (-1);
      }

      G_warning ( "Your GRASS version does not fully support topology format %d.%d of the vector."
	          " Consider to rebuild topology or upgrade GRASS.",
	              ptr->Version_Major, ptr->Version_Minor );
  }

  dig_init_portable ( &(ptr->port), byte_order); 
  dig_set_cur_port ( &(ptr->port) );
  
  /* bytes 6 - 9 : header size */
  if (0 >= dig__fread_port_L (&(ptr->head_size), 1, fp)) return (-1);
  G_debug (2, "  header size %ld", ptr->head_size );

  /* byte 10 : dimension 2D or 3D */
  if (0 >= dig__fread_port_C (buf, 1, fp)) return (-1);
  ptr->with_z  = buf[0];
  G_debug (2, "  with_z %d", ptr->with_z );

  /* bytes 11 - 58 : bound box */
  if (0 >= dig__fread_port_D (&(ptr->box.N), 1, fp)) return (-1);
  if (0 >= dig__fread_port_D (&(ptr->box.S), 1, fp)) return (-1);
  if (0 >= dig__fread_port_D (&(ptr->box.E), 1, fp)) return (-1);
  if (0 >= dig__fread_port_D (&(ptr->box.W), 1, fp)) return (-1);
  if (0 >= dig__fread_port_D (&(ptr->box.T), 1, fp)) return (-1);
  if (0 >= dig__fread_port_D (&(ptr->box.B), 1, fp)) return (-1);
  
  /* bytes 59 - 86 : number of structures */
  if (0 >= dig__fread_port_P (&(ptr->n_nodes), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_edges), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_lines), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_areas), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_isles), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_volumes), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_holes), 1, fp)) return (-1);

  /* bytes 87 - 110 : number of line types */
  if (0 >= dig__fread_port_P (&(ptr->n_plines), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_llines), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_blines), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_clines), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_flines), 1, fp)) return (-1);
  if (0 >= dig__fread_port_P (&(ptr->n_klines), 1, fp)) return (-1);

  /* bytes 111 - 138 : Offset */
  if (0 >= dig__fread_port_L (&(ptr->Node_offset), 1, fp)) return (-1);
  if (0 >= dig__fread_port_L (&(ptr->Edge_offset), 1, fp)) return (-1);
  if (0 >= dig__fread_port_L (&(ptr->Line_offset), 1, fp)) return (-1);
  if (0 >= dig__fread_port_L (&(ptr->Area_offset), 1, fp)) return (-1);
  if (0 >= dig__fread_port_L (&(ptr->Isle_offset), 1, fp)) return (-1);
  if (0 >= dig__fread_port_L (&(ptr->Volume_offset), 1, fp)) return (-1);
  if (0 >= dig__fread_port_L (&(ptr->Hole_offset), 1, fp)) return (-1);
  
  /* bytes 139 - 142 : Coor size and time */
  if (0 >= dig__fread_port_L (&(ptr->coor_size), 1, fp)) return (-1);

  G_debug (2, "  coor size %ld", ptr->coor_size );

  dig_fseek ( fp, ptr->head_size, SEEK_SET );

  return (0);
}

int 
dig_Wr_Plus_head ( GVFILE * fp,
		     struct Plus_head *ptr)
{
  unsigned char buf[10];
  long length = 142;
    
  dig_rewind (fp);
  dig_set_cur_port (&(ptr->port)); 

  /* bytes 1 - 5 */
  buf[0] = GV_TOPO_VER_MAJOR;
  buf[1] = GV_TOPO_VER_MINOR;
  buf[2] = GV_TOPO_EARLIEST_MAJOR;
  buf[3] = GV_TOPO_EARLIEST_MINOR;
  buf[4] = ptr->port.byte_order;
  if (0 >= dig__fwrite_port_C (buf, 5, fp)) return (-1);
 
  /* bytes 6 - 9 : header size */
  if (0 >= dig__fwrite_port_L ( &length, 1, fp)) return (0);

  /* byte 10 : dimension 2D or 3D */
  buf[0] = ptr->with_z;
  if (0 >= dig__fwrite_port_C ( buf, 1, fp)) return (0);

  /* bytes 11 - 58 : bound box */
  if (0 >= dig__fwrite_port_D (&(ptr->box.N), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->box.S), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->box.E), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->box.W), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->box.T), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_D (&(ptr->box.B), 1, fp)) return (-1);
  
  /* bytes 59 - 86 : number of structures */
  if (0 >= dig__fwrite_port_P (&(ptr->n_nodes), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_edges), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_lines), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_areas), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_isles), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_volumes), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_holes), 1, fp)) return (-1);

  /* bytes 87 - 110 : number of line types */
  if (0 >= dig__fwrite_port_P (&(ptr->n_plines), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_llines), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_blines), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_clines), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_flines), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_P (&(ptr->n_klines), 1, fp)) return (-1);

  /* bytes 111 - 138 : Offset */
  if (0 >= dig__fwrite_port_L (&(ptr->Node_offset), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_L (&(ptr->Edge_offset), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_L (&(ptr->Line_offset), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_L (&(ptr->Area_offset), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_L (&(ptr->Isle_offset), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_L (&(ptr->Volume_offset), 1, fp)) return (-1);
  if (0 >= dig__fwrite_port_L (&(ptr->Hole_offset), 1, fp)) return (-1);

  /* bytes 139 - 142 : Coor size and time */
  if (0 >= dig__fwrite_port_L (&(ptr->coor_size), 1, fp)) return (-1);

  G_debug (2, "topo body offset %ld", dig_ftell( fp) );
  
  return (0);
}