Index: trunk/Ohana/src/libfits/include/gfitsio.h
===================================================================
--- trunk/Ohana/src/libfits/include/gfitsio.h	(revision 29938)
+++ trunk/Ohana/src/libfits/include/gfitsio.h	(revision 31663)
@@ -63,6 +63,6 @@
   Header                 *header;
   char                   *buffer;
-  off_t                   datasize;
-  off_t                   validsize;
+  off_t                   datasize; // size of the buffer (including block padding at the end)
+  off_t                   validsize;  // size of the valid portion of the table (< validsize if file is short)
 } FTable;
 
@@ -199,4 +199,6 @@
 int     gfits_vtable_from_ftable       PROTO((FTable *ftable, VTable *vtable, off_t *row, off_t Nrow));
 int     gfits_write_table              PROTO((char *filename, FTable *ftable)); 
+int     gfits_copy_ftable              PROTO((FTable *in, FTable *out));
+int     gfits_copy_vtable              PROTO((VTable *in, VTable *out));
 
 int     gfits_create_Theader           PROTO((Header *header, char *type));