blkarray_list.h

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 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
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/*
 * blkarray_list.h -- array-based list structure, for memory and access
 *      efficiency.
 * 
 * HISTORY
 * 
 * $Log: blkarray_list.h,v $
 * Revision 1.1.1.1  2006/05/23 18:45:02  dhuggins
 * re-importation
 *
 * Revision 1.2  2004/12/10 16:48:58  rkm
 * Added continuous density acoustic model handling
 *
 * Revision 1.1  2004/07/16 00:57:12  egouvea
 * Added Ravi's implementation of FSG support.
 *
 * Revision 1.2  2004/05/27 14:22:57  rkm
 * FSG cross-word triphones completed (but for single-phone words)
 *
 * Revision 1.1.1.1  2004/03/01 14:30:31  rkm
 *
 *
 * Revision 1.1  2004/02/26 01:14:48  rkm
 * *** empty log message ***
 *
 * 
 * 18-Feb-2004  M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon
 *              Started.
 */
 
 
#ifndef __S2_BLKARRAY_LIST_H__
#define __S2_BLKARRAY_LIST_H__
 
 
#include <sphinxbase/prim_type.h>
 
 
/*
 * For maintaining a (conceptual) "list" of pointers to arbitrary data.
 * The application is responsible for knowing the true data type.
 * Use an array instead of a true list for efficiency (both memory and
 * speed).  But use a blocked (2-D) array to allow dynamic resizing at a
 * coarse grain.  An entire block is allocated or freed, as appropriate.
 */
typedef struct blkarray_list_s {
  void ***ptr;          /* ptr[][] is the user-supplied ptr */
  int32 maxblks;        /* size of ptr (#rows) */
  int32 blksize;        /* size of ptr[] (#cols, ie, size of each row) */
  int32 n_valid;        /* # entries actually stored in the list */
  int32 cur_row;        /* The current row being that has empty entry */
  int32 cur_row_free;   /* First entry valid within the current row */
} blkarray_list_t;
 
/* Access macros */
#define blkarray_list_ptr(l,r,c)        ((l)->ptr[r][c])
#define blkarray_list_maxblks(l)        ((l)->maxblks)
#define blkarray_list_blksize(l)        ((l)->blksize)
#define blkarray_list_n_valid(l)        ((l)->n_valid)
#define blkarray_list_cur_row(l)        ((l)->cur_row)
#define blkarray_list_cur_row_free(l)   ((l)->cur_row_free)
 
 
/*
 * Initialize and return a new blkarray_list containing an empty list
 * (i.e., 0 length).  Sized for the given values of maxblks and blksize.
 * NOTE: (maxblks * blksize) should not overflow int32, but this is not
 * checked.
 * Return the allocated entry if successful, NULL if any error.
 */
blkarray_list_t *_blkarray_list_init (int32 maxblks, int32 blksize);
 
 
/*
 * Like _blkarray_list_init() above, but for some default values of
 * maxblks and blksize.
 */
blkarray_list_t *blkarray_list_init ( void );

void blkarray_list_free(blkarray_list_t *bl);
 
 
/*
 * Append the given new entry (data) to the end of the list.
 * Return the index of the entry if successful, -1 if any error.
 * The returned indices are guaranteed to be successive integers (i.e.,
 * 0, 1, 2...) for successive append operations, until the list is reset,
 * when they resume from 0.
 */
int32 blkarray_list_append (blkarray_list_t *, void *data);
 
 
/*
 * Free all the entries in the list (using ckd_free) and reset the
 * list length to 0.
 */
void blkarray_list_reset (blkarray_list_t *);
 
 
/* Gets n-th element of the array list */
void * blkarray_list_get(blkarray_list_t *, int32 n);
 
#endif