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/*
  Copyright (c) 2007 Taco Hoekwater <taco@luatex.org>
  
  This file is part of LuaTeX.
  
  LuaTeX is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  LuaTeX 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 General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with LuaTeX; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  $Id$ */

#ifndef MANAGED_SA_H
#define MANAGED_SA_H 1

/* the next two sets of three had better match up exactly, but using bare numbers
  is easier on the C compiler */

#define HIGHPART 128
#define MIDPART 128
#define LOWPART 128

#define HIGHPART_PART(a) ((a>>14)&127)
#define MIDPART_PART(a)  ((a>>7)&127)
#define LOWPART_PART(a)  (a&127)

#define Mxmalloc_array(a,b)  xmalloc(b*sizeof(a))
#define Mxrealloc_array(a,b,c)  xrealloc(a,c*sizeof(b))
#define Mxfree(a) free(a); a=NULL

typedef unsigned int  sa_tree_item;

typedef struct {
  int          code;
  int          level;
  sa_tree_item value;
} sa_stack_item;


typedef struct {
  int stack_size;           /* initial stack size   */
  int stack_step;           /* increment stack step */
  int stack_ptr;            /* current stack point  */
  int dflt;                 /* default item value   */  
  sa_tree_item *** tree;    /* item tree head       */
  sa_stack_item  * stack;   /* stack tree head      */
} sa_tree_head;

typedef sa_tree_head *sa_tree;

extern sa_tree_item get_sa_item     (const sa_tree head, const integer n) ;
extern void         set_sa_item     (sa_tree head, integer n, sa_tree_item v, integer gl) ;

extern sa_tree      new_sa_tree     (integer size, sa_tree_item dflt);

extern sa_tree      copy_sa_tree     (sa_tree head);
extern void         destroy_sa_tree  (sa_tree head);

extern void         dump_sa_tree    (sa_tree a);
extern sa_tree      undump_sa_tree  (void) ;

extern void         restore_sa_stack  (sa_tree a, integer gl);
extern void         clear_sa_stack    (sa_tree a);

#endif