/*
  This is some code to handle a stack of NeXus files. This is used to implement 
  external linking within the NeXus-API

  Copyright (C) 1997-2006 Mark Koennecke
  
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.
 
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
  For further information, see <http://www.neutron.anl.gov/NeXus/>
*/
#ifndef NEXUSFILESTACK
#define NEXUSFILESTACK

typedef struct __fileStack *pFileStack;
#define MAXEXTERNALDEPTH 16

pFileStack makeFileStack();
void killFileStack(pFileStack self);

void pushFileStack(pFileStack self, pNexusFunction pDriv, char *filename);
void popFileStack(pFileStack self);

pNexusFunction peekFileOnStack(pFileStack self);
char *peekFilenameOnStack(pFileStack self);
void peekIDOnStack(pFileStack self, NXlink *id);
void setCloseID(pFileStack self, NXlink id);
 
int fileStackDepth(pFileStack self);

#endif