01399 {
01400   int i;
01401 
01402   while (*s1 && *s2)
01403     if (*s1++ != *s2++)
01404       return (0);
01405 
01406   if (*s1 != *s2)
01407     return (0);
01408   else
01409     return (1);
01410 }

01365 {
01366   fclose (plyfile->fp);
01367 
01368   /* free up memory associated with the PLY file */
01369   free (plyfile);
01370 }

00248 {
00249   int i;
00250   PlyElement *elem;
00251   PlyProperty *prop;
00252 
00253   /* look for appropriate element */
00254   elem = find_element (plyfile, elem_name);
00255   if (elem == NULL) {
00256     fprintf(stderr,"ply_describe_element: can't find element '%s'\n",elem_name);
00257     exit (-1);
00258   }
00259 
00260   elem->num = nelems;
00261 
00262   /* copy the list of properties */
00263 
00264   elem->nprops = nprops;
00265   elem->props = (PlyProperty **) myalloc (sizeof (PlyProperty *) * nprops);
00266   elem->store_prop = (char *) myalloc (sizeof (char) * nprops);
00267 
00268   for (i = 0; i < nprops; i++) {
00269     prop = (PlyProperty *) myalloc (sizeof (PlyProperty));
00270     elem->props[i] = prop;
00271     elem->store_prop[i] = NAMED_PROP;
00272     copy_property (prop, &prop_list[i]);
00273   }
00274 }

01285 {
01286   int i;
01287   OtherElem *other;
01288 
01289   /* ignore this call if there is no other element */
01290   if (other_elems == NULL)
01291     return;
01292 
01293   /* save pointer to this information */
01294   plyfile->other_elems = other_elems;
01295 
01296   /* describe the other properties of this element */
01297 
01298   for (i = 0; i < other_elems->num_elems; i++) {
01299     other = &(other_elems->other_list[i]);
01300     ply_element_count (plyfile, other->elem_name, other->elem_count);
01301     ply_describe_other_properties (plyfile, other->other_props,
01302                                    offsetof(OtherData,other_props));
01303   }
01304 }

00291 {
00292   PlyElement *elem;
00293   PlyProperty *elem_prop;
00294 
00295   /* look for appropriate element */
00296   elem = find_element (plyfile, elem_name);
00297   if (elem == NULL) {
00298     fprintf(stderr, "ply_describe_property: can't find element '%s'\n",
00299             elem_name);
00300     return;
00301   }
00302 
00303   /* create room for new property */
00304 
00305   if (elem->nprops == 0) {
00306     elem->props = (PlyProperty **) myalloc (sizeof (PlyProperty *));
00307     elem->store_prop = (char *) myalloc (sizeof (char));
00308     elem->nprops = 1;
00309   }
00310   else {
00311     elem->nprops++;
00312     elem->props = (PlyProperty **)
00313                   realloc (elem->props, sizeof (PlyProperty *) * elem->nprops);
00314     elem->store_prop = (char *)
00315                   realloc (elem->store_prop, sizeof (char) * elem->nprops);
00316   }
00317 
00318   /* copy the new property */
00319 
00320   elem_prop = (PlyProperty *) myalloc (sizeof (PlyProperty));
00321   elem->props[elem->nprops - 1] = elem_prop;
00322   elem->store_prop[elem->nprops - 1] = NAMED_PROP;
00323   copy_property (elem_prop, prop);
00324 }

00397 {
00398   int i;
00399   PlyElement *elem;
00400   PlyProperty *prop;
00401 
00402   /* look for appropriate element */
00403   elem = find_element (plyfile, elem_name);
00404   if (elem == NULL) {
00405     fprintf(stderr,"ply_element_count: can't find element '%s'\n",elem_name);
00406     exit (-1);
00407   }
00408 
00409   elem->num = nelems;
00410 }

01345 {
01346 
01347 }

01012 {
01013   *num_comments = plyfile->num_comments;
01014   return (plyfile->comments);
01015 }

00992 {
00993   if (plyfile->file_type == PLY_ASCII)
00994     ascii_get_element (plyfile, (char *) elem_ptr);
00995   else
00996     binary_get_element (plyfile, (char *) elem_ptr);
00997 }

00860 {
00861   int i;
00862   PlyElement *elem;
00863   PlyProperty *prop;
00864   PlyProperty **prop_list;
00865 
00866   /* find information about the element */
00867   elem = find_element (plyfile, elem_name);
00868   if (elem == NULL)
00869     return (NULL);
00870 
00871   *nelems = elem->num;
00872   *nprops = elem->nprops;
00873 
00874   /* make a copy of the element's property list */
00875   prop_list = (PlyProperty **) myalloc (sizeof (PlyProperty *) * elem->nprops);
00876   for (i = 0; i < elem->nprops; i++) {
00877     prop = (PlyProperty *) myalloc (sizeof (PlyProperty));
00878     copy_property (prop, elem->props[i]);
00879     prop_list[i] = prop;
00880   }
00881 
00882   /* return this duplicate property list */
00883   return (prop_list);
00884 }

00904 {
00905   int i;
00906   PlyElement *elem;
00907   PlyProperty *prop;
00908   int index;
00909 
00910   /* find information about the element */
00911   elem = find_element (plyfile, elem_name);
00912   plyfile->which_elem = elem;
00913 
00914   /* deposit the property information into the element's description */
00915   for (i = 0; i < nprops; i++) {
00916 
00917     /* look for actual property */
00918     prop = find_property (elem, prop_list[i].name, &index);
00919     if (prop == NULL) {
00920       fprintf (stderr, "Warning:  Can't find property '%s' in element '%s'\n",
00921                prop_list[i].name, elem_name);
00922       continue;
00923     }
00924 
00925     /* store its description */
00926     prop->internal_type = prop_list[i].internal_type;
00927     prop->offset = prop_list[i].offset;
00928     prop->count_internal = prop_list[i].count_internal;
00929     prop->count_offset = prop_list[i].count_offset;
00930 
00931     /* specify that the user wants this property */
00932     elem->store_prop[index] = STORE_PROP;
00933   }
00934 }

01385 {
01386   if (ply == NULL)
01387     return;
01388 
01389   *version = ply->version;
01390   *file_type = ply->file_type;
01391 }

01031 {
01032   *num_obj_info = plyfile->num_obj_info;
01033   return (plyfile->obj_info);
01034 }

01213 {
01214   int i;
01215   PlyElement *elem;
01216   PlyOtherElems *other_elems;
01217   OtherElem *other;
01218   int num_elems;
01219 
01220   /* look for appropriate element */
01221   elem = find_element (plyfile, elem_name);
01222   if (elem == NULL) {
01223     fprintf (stderr,
01224              "ply_get_other_element: can't find element '%s'\n", elem_name);
01225     exit (-1);
01226   }
01227 
01228   /* create room for the new "other" element, initializing the */
01229   /* other data structure if necessary */
01230 
01231   if (plyfile->other_elems == NULL) {
01232     plyfile->other_elems = (PlyOtherElems *) myalloc (sizeof (PlyOtherElems));
01233     other_elems = plyfile->other_elems;
01234     other_elems->other_list = (OtherElem *) myalloc (sizeof (OtherElem));
01235     other = &(other_elems->other_list[0]);
01236     other_elems->num_elems = 1;
01237   }
01238   else {
01239     other_elems = plyfile->other_elems;
01240     other_elems->other_list = (OtherElem *) realloc (other_elems->other_list,
01241                               sizeof (OtherElem) * other_elems->num_elems + 1);
01242     other = &(other_elems->other_list[other_elems->num_elems]);
01243     other_elems->num_elems++;
01244   }
01245 
01246   /* count of element instances in file */
01247   other->elem_count = elem_count;
01248 
01249   /* save name of element */
01250   other->elem_name = strdup (elem_name);
01251 
01252   /* create a list to hold all the current elements */
01253   other->other_data = (OtherData **)
01254                   malloc (sizeof (OtherData *) * other->elem_count);
01255 
01256   /* set up for getting elements */
01257   other->other_props = ply_get_other_properties (plyfile, elem_name,
01258                          offsetof(OtherData,other_props));
01259 
01260   /* grab all these elements */
01261   for (i = 0; i < other->elem_count; i++) {
01262     /* grab and element from the file */
01263     other->other_data[i] = (OtherData *) malloc (sizeof (OtherData));
01264     ply_get_element (plyfile, (void *) other->other_data[i]);
01265   }
01266 
01267   /* return pointer to the other elements data */
01268   return (other_elems);
01269 }

01124 {
01125   int i;
01126   PlyElement *elem;
01127   PlyOtherProp *other;
01128   PlyProperty *prop;
01129   int nprops;
01130 
01131   /* find information about the element */
01132   elem = find_element (plyfile, elem_name);
01133   if (elem == NULL) {
01134     fprintf (stderr, "ply_get_other_properties: Can't find element '%s'\n",
01135              elem_name);
01136     return (NULL);
01137   }
01138 
01139   /* remember that this is the "current" element */
01140   plyfile->which_elem = elem;
01141 
01142   /* save the offset to where to store the other_props */
01143   elem->other_offset = offset;
01144 
01145   /* place the appropriate pointers, etc. in the element's property list */
01146   setup_other_props (plyfile, elem);
01147 
01148   /* create structure for describing other_props */
01149   other = (PlyOtherProp *) myalloc (sizeof (PlyOtherProp));
01150   other->name = strdup (elem_name);
01151 #if 0
01152   if (elem->other_offset == NO_OTHER_PROPS) {
01153     other->size = 0;
01154     other->props = NULL;
01155     other->nprops = 0;
01156     return (other);
01157   }
01158 #endif
01159   other->size = elem->other_size;
01160   other->props = (PlyProperty **) myalloc (sizeof(PlyProperty) * elem->nprops);
01161   
01162   /* save descriptions of each "other" property */
01163   nprops = 0;
01164   for (i = 0; i < elem->nprops; i++) {
01165     if (elem->store_prop[i])
01166       continue;
01167     prop = (PlyProperty *) myalloc (sizeof (PlyProperty));
01168     copy_property (prop, elem->props[i]);
01169     other->props[nprops] = prop;
01170     nprops++;
01171   }
01172   other->nprops = nprops;
01173 
01174 #if 1
01175   /* set other_offset pointer appropriately if there are NO other properties */
01176   if (other->nprops == 0) {
01177     elem->other_offset = NO_OTHER_PROPS;
01178   }
01179 #endif
01180   
01181   /* return structure */
01182   return (other);
01183 }

00954 {
00955   PlyElement *elem;
00956   PlyProperty *prop_ptr;
00957   int index;
00958 
00959   /* find information about the element */
00960   elem = find_element (plyfile, elem_name);
00961   plyfile->which_elem = elem;
00962 
00963   /* deposit the property information into the element's description */
00964 
00965   prop_ptr = find_property (elem, prop->name, &index);
00966   if (prop_ptr == NULL) {
00967     fprintf (stderr, "Warning:  Can't find property '%s' in element '%s'\n",
00968              prop->name, elem_name);
00969     return;
00970   }
00971   prop_ptr->internal_type  = prop->internal_type;
00972   prop_ptr->offset         = prop->offset;
00973   prop_ptr->count_internal = prop->count_internal;
00974   prop_ptr->count_offset   = prop->count_offset;
00975 
00976   /* specify that the user wants this property */
00977   elem->store_prop[index] = STORE_PROP;
00978 }

00422 {
00423   int i,j;
00424   FILE *fp = plyfile->fp;
00425   PlyElement *elem;
00426   PlyProperty *prop;
00427 
00428   fprintf (fp, "ply\n");
00429 
00430   switch (plyfile->file_type) {
00431     case PLY_ASCII:
00432       fprintf (fp, "format ascii 1.0\n");
00433       break;
00434     case PLY_BINARY_BE:
00435       fprintf (fp, "format binary_big_endian 1.0\n");
00436       break;
00437     case PLY_BINARY_LE:
00438       fprintf (fp, "format binary_little_endian 1.0\n");
00439       break;
00440     default:
00441       fprintf (stderr, "ply_header_complete: bad file type = %d\n",
00442                plyfile->file_type);
00443       exit (-1);
00444   }
00445 
00446   /* write out the comments */
00447 
00448   for (i = 0; i < plyfile->num_comments; i++)
00449     fprintf (fp, "comment %s\n", plyfile->comments[i]);
00450 
00451   /* write out object information */
00452 
00453   for (i = 0; i < plyfile->num_obj_info; i++)
00454     fprintf (fp, "obj_info %s\n", plyfile->obj_info[i]);
00455 
00456   /* write out information about each element */
00457 
00458   for (i = 0; i < plyfile->nelems; i++) {
00459 
00460     elem = plyfile->elems[i];
00461     fprintf (fp, "element %s %d\n", elem->name, elem->num);
00462 
00463     /* write out each property */
00464     for (j = 0; j < elem->nprops; j++) {
00465       prop = elem->props[j];
00466       if (prop->is_list) {
00467         fprintf (fp, "property list ");
00468         write_scalar_type (fp, prop->count_external);
00469         fprintf (fp, " ");
00470         write_scalar_type (fp, prop->external_type);
00471         fprintf (fp, " %s\n", prop->name);
00472       }
00473       else {
00474         fprintf (fp, "property ");
00475         write_scalar_type (fp, prop->external_type);
00476         fprintf (fp, " %s\n", prop->name);
00477       }
00478     }
00479   }
00480 
00481   fprintf (fp, "end_header\n");
00482 }

00807 {
00808   FILE *fp;
00809   PlyFile *plyfile;
00810   char *name;
00811 
00812   /* tack on the extension .ply, if necessary */
00813 
00814   name = (char *) myalloc (sizeof (char) * (strlen (filename) + 5));
00815   strcpy (name, filename);
00816   if (strlen (name) < 4 ||
00817       strcmp (name + strlen (name) - 4, ".ply") != 0)
00818       strcat (name, ".ply");
00819 
00820   /* open the file for reading */
00821 
00822   fp = fopen (name, "r");
00823   if (fp == NULL)
00824     return (NULL);
00825 
00826   /* create the PlyFile data structure */
00827 
00828   plyfile = ply_read (fp, nelems, elem_names);
00829 
00830   /* determine the file type and version */
00831 
00832   *file_type = plyfile->file_type;
00833   *version = plyfile->version;
00834 
00835   /* return a pointer to the file's information */
00836 
00837   return (plyfile);
00838 }

00193 {
00194   int i;
00195   PlyFile *plyfile;
00196   PlyElement *elem;
00197   char *name;
00198   FILE *fp;
00199 
00200   /* tack on the extension .ply, if necessary */
00201 
00202   name = (char *) myalloc (sizeof (char) * (strlen (filename) + 5));
00203   strcpy (name, filename);
00204   if (strlen (name) < 4 ||
00205       strcmp (name + strlen (name) - 4, ".ply") != 0)
00206       strcat (name, ".ply");
00207 
00208   /* open the file for writing */
00209 
00210   fp = fopen (name, "w");
00211   if (fp == NULL) {
00212     return (NULL);
00213   }
00214 
00215   /* create the actual PlyFile structure */
00216 
00217   plyfile = ply_write (fp, nelems, elem_names, file_type);
00218   if (plyfile == NULL)
00219     return (NULL);
00220 
00221   /* say what PLY file version number we're writing */
00222   *version = plyfile->version;
00223 
00224   /* return pointer to the file descriptor */
00225   return (plyfile);
00226 }

00632 {
00633   /* (re)allocate space for new comment */
00634   if (plyfile->num_comments == 0)
00635     plyfile->comments = (char **) myalloc (sizeof (char *));
00636   else
00637     plyfile->comments = (char **) realloc (plyfile->comments,
00638                          sizeof (char *) * (plyfile->num_comments + 1));
00639 
00640   /* add comment to list */
00641   plyfile->comments[plyfile->num_comments] = strdup (comment);
00642   plyfile->num_comments++;
00643 }

00519 {
00520   int i,j,k;
00521   FILE *fp = plyfile->fp;
00522   PlyElement *elem;
00523   PlyProperty *prop;
00524   char *elem_data,*item;
00525   char **item_ptr;
00526   int list_count;
00527   int item_size;
00528   int int_val;
00529   unsigned int uint_val;
00530   double double_val;
00531   char **other_ptr;
00532 
00533   elem = plyfile->which_elem;
00534   elem_data = elem_ptr;
00535   other_ptr = (char **) (((char *) elem_ptr) + elem->other_offset);
00536 
00537   /* write out either to an ascii or binary file */
00538 
00539   if (plyfile->file_type == PLY_ASCII) {
00540 
00541     /* write an ascii file */
00542 
00543     /* write out each property of the element */
00544     for (j = 0; j < elem->nprops; j++) {
00545       prop = elem->props[j];
00546       if (elem->store_prop[j] == OTHER_PROP)
00547         elem_data = *other_ptr;
00548       else
00549         elem_data = elem_ptr;
00550       if (prop->is_list) {
00551         item = elem_data + prop->count_offset;
00552         get_stored_item ((void *) item, prop->count_internal,
00553                          &int_val, &uint_val, &double_val);
00554         write_ascii_item (fp, int_val, uint_val, double_val,
00555                           prop->count_external);
00556         list_count = uint_val;
00557         item_ptr = (char **) (elem_data + prop->offset);
00558         item = item_ptr[0];
00559        item_size = ply_type_size[prop->internal_type];
00560         for (k = 0; k < list_count; k++) {
00561           get_stored_item ((void *) item, prop->internal_type,
00562                            &int_val, &uint_val, &double_val);
00563           write_ascii_item (fp, int_val, uint_val, double_val,
00564                             prop->external_type);
00565           item += item_size;
00566         }
00567       }
00568       else {
00569         item = elem_data + prop->offset;
00570         get_stored_item ((void *) item, prop->internal_type,
00571                          &int_val, &uint_val, &double_val);
00572         write_ascii_item (fp, int_val, uint_val, double_val,
00573                           prop->external_type);
00574       }
00575     }
00576 
00577     fprintf (fp, "\n");
00578   }
00579   else {
00580 
00581     /* write a binary file */
00582 
00583     /* write out each property of the element */
00584     for (j = 0; j < elem->nprops; j++) {
00585       prop = elem->props[j];
00586       if (elem->store_prop[j] == OTHER_PROP)
00587         elem_data = *other_ptr;
00588       else
00589         elem_data = elem_ptr;
00590       if (prop->is_list) {
00591         item = elem_data + prop->count_offset;
00592         item_size = ply_type_size[prop->count_internal];
00593         get_stored_item ((void *) item, prop->count_internal,
00594                          &int_val, &uint_val, &double_val);
00595         write_binary_item (fp, int_val, uint_val, double_val,
00596                            prop->count_external);
00597         list_count = uint_val;
00598         item_ptr = (char **) (elem_data + prop->offset);
00599         item = item_ptr[0];
00600         item_size = ply_type_size[prop->internal_type];
00601         for (k = 0; k < list_count; k++) {
00602           get_stored_item ((void *) item, prop->internal_type,
00603                            &int_val, &uint_val, &double_val);
00604           write_binary_item (fp, int_val, uint_val, double_val,
00605                              prop->external_type);
00606           item += item_size;
00607         }
00608       }
00609       else {
00610         item = elem_data + prop->offset;
00611         item_size = ply_type_size[prop->internal_type];
00612         get_stored_item ((void *) item, prop->internal_type,
00613                          &int_val, &uint_val, &double_val);
00614         write_binary_item (fp, int_val, uint_val, double_val,
00615                            prop->external_type);
00616       }
00617     }
00618 
00619   }
00620 }

00495 {
00496   PlyElement *elem;
00497 
00498   elem = find_element (plyfile, elem_name);
00499   if (elem == NULL) {
00500     fprintf(stderr, "ply_elements_setup: can't find element '%s'\n", elem_name);
00501     exit (-1);
00502   }
00503 
00504   plyfile->which_elem = elem;
00505 }

00656 {
00657   /* (re)allocate space for new info */
00658   if (plyfile->num_obj_info == 0)
00659     plyfile->obj_info = (char **) myalloc (sizeof (char *));
00660   else
00661     plyfile->obj_info = (char **) realloc (plyfile->obj_info,
00662                          sizeof (char *) * (plyfile->num_obj_info + 1));
00663 
00664   /* add info to list */
00665   plyfile->obj_info[plyfile->num_obj_info] = strdup (obj_info);
00666   plyfile->num_obj_info++;
00667 }

01315 {
01316   int i,j;
01317   OtherElem *other;
01318 
01319   /* make sure we have other elements to write */
01320   if (plyfile->other_elems == NULL)
01321     return;
01322 
01323   /* write out the data for each "other" element */
01324 
01325   for (i = 0; i < plyfile->other_elems->num_elems; i++) {
01326 
01327     other = &(plyfile->other_elems->other_list[i]);
01328     ply_put_element_setup (plyfile, other->elem_name);
01329 
01330     /* write out each instance of the current element */
01331     for (j = 0; j < other->elem_count; j++)
01332       ply_put_element (plyfile, (void *) other->other_data[j]);
01333   }
01334 }

00694 {
00695   int i,j;
00696   PlyFile *plyfile;
00697   int nwords;
00698   char **words;
00699   int found_format = 0;
00700   char **elist;
00701   PlyElement *elem;
00702   char *orig_line;
00703 
00704   /* check for NULL file pointer */
00705   if (fp == NULL)
00706     return (NULL);
00707 
00708   /* create record for this object */
00709 
00710   plyfile = (PlyFile *) myalloc (sizeof (PlyFile));
00711   plyfile->nelems = 0;
00712   plyfile->comments = NULL;
00713   plyfile->num_comments = 0;
00714   plyfile->obj_info = NULL;
00715   plyfile->num_obj_info = 0;
00716   plyfile->fp = fp;
00717   plyfile->other_elems = NULL;
00718 
00719   /* read and parse the file's header */
00720 
00721   words = get_words (plyfile->fp, &nwords, &orig_line);
00722   if (!words || !equal_strings (words[0], "ply"))
00723     return (NULL);
00724 
00725   while (words) {
00726 
00727     /* parse words */
00728 
00729     if (equal_strings (words[0], "format")) {
00730       if (nwords != 3)
00731         return (NULL);
00732       if (equal_strings (words[1], "ascii"))
00733         plyfile->file_type = PLY_ASCII;
00734       else if (equal_strings (words[1], "binary_big_endian"))
00735         plyfile->file_type = PLY_BINARY_BE;
00736       else if (equal_strings (words[1], "binary_little_endian"))
00737         plyfile->file_type = PLY_BINARY_LE;
00738       else
00739         return (NULL);
00740       plyfile->version = atof (words[2]);
00741       found_format = 1;
00742     }
00743     else if (equal_strings (words[0], "element"))
00744       add_element (plyfile, words, nwords);
00745     else if (equal_strings (words[0], "property"))
00746       add_property (plyfile, words, nwords);
00747     else if (equal_strings (words[0], "comment"))
00748       add_comment (plyfile, orig_line);
00749     else if (equal_strings (words[0], "obj_info"))
00750       add_obj_info (plyfile, orig_line);
00751     else if (equal_strings (words[0], "end_header"))
00752       break;
00753 
00754     /* free up words space */
00755     free (words);
00756 
00757     words = get_words (plyfile->fp, &nwords, &orig_line);
00758   }
00759 
00760   /* create tags for each property of each element, to be used */
00761   /* later to say whether or not to store each property for the user */
00762 
00763   for (i = 0; i < plyfile->nelems; i++) {
00764     elem = plyfile->elems[i];
00765     elem->store_prop = (char *) myalloc (sizeof (char) * elem->nprops);
00766     for (j = 0; j < elem->nprops; j++)
00767       elem->store_prop[j] = DONT_STORE_PROP;
00768     elem->other_offset = NO_OTHER_PROPS; /* no "other" props by default */
00769   }
00770 
00771   /* set return values about the elements */
00772 
00773   elist = (char **) myalloc (sizeof (char *) * plyfile->nelems);
00774   for (i = 0; i < plyfile->nelems; i++)
00775     elist[i] = strdup (plyfile->elems[i]->name);
00776 
00777   *elem_names = elist;
00778   *nelems = plyfile->nelems;
00779 
00780   /* return a pointer to the file's information */
00781 
00782   return (plyfile);
00783 }

00136 {
00137   int i;
00138   PlyFile *plyfile;
00139   PlyElement *elem;
00140 
00141   /* check for NULL file pointer */
00142   if (fp == NULL)
00143     return (NULL);
00144 
00145   /* create a record for this object */
00146 
00147   plyfile = (PlyFile *) myalloc (sizeof (PlyFile));
00148   plyfile->file_type = file_type;
00149   plyfile->num_comments = 0;
00150   plyfile->num_obj_info = 0;
00151   plyfile->nelems = nelems;
00152   plyfile->version = 1.0;
00153   plyfile->fp = fp;
00154   plyfile->other_elems = NULL;
00155 
00156   /* tuck aside the names of the elements */
00157 
00158   plyfile->elems = (PlyElement **) myalloc (sizeof (PlyElement *) * nelems);
00159   for (i = 0; i < nelems; i++) {
00160     elem = (PlyElement *) myalloc (sizeof (PlyElement));
00161     plyfile->elems[i] = elem;
00162     elem->name = strdup (elem_names[i]);
00163     elem->num = 0;
00164     elem->nprops = 0;
00165   }
00166 
00167   /* return pointer to the file descriptor */
00168   return (plyfile);
00169 }