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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF.  The full HDF copyright notice, including       *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at      *
 * http://hdfgroup.org/products/hdf4/doc/Copyright.html.  If you do not have *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/* $Id: dfan.h 4932 2007-09-07 17:17:23Z bmribler $ */

/*------------------------------------------------------------------------------
 * File:    dfan.h
 * Purpose: header file for the Annotations set
 * Invokes: df.h
 * Contents:
 *  Structure definitions: DFANdirentry, DFANdirhead
 *  Constant definitions: DFAN_LABEL, DFAN_DESC
 * Remarks: none
 *----------------------------------------------------------------------------*/

#ifndef DFAN_H  /* avoid re-inclusion */
#define DFAN_H

#include "hdf.h"

#define DFAN_LABEL  0
#define DFAN_DESC   1

#define DFAN_LAB_BLKSIZE   64   /* default blksize to use for labels */
#define DFAN_DESC_BLKSIZE 512   /* default blksize to use for descriptions */

#define DFAN_DEFENTRIES 16  /* no of dir entries to add at a time */

/*
 * This structure stores an entry in the label/desc directory
 * for a label/desc in the file, it gives the ref of the label/desc,
 * and the tag/ref of the data item to which the label/desc relates
 */
typedef struct
  {
      uint16      annref;       /* ref of annotation */
      uint16      datatag;      /* tag of data */
      uint16      dataref;      /* ref of data */
  }
DFANdirentry;

/*
 * This structure is a head node for the directory, which is organized as
 * as a linked list of arrays.  DFANdirentry is the structure of an
 * array element, while DFANdirhead is the list element
 */
typedef struct DFANdirhead
  {
      struct DFANdirhead *next; /* list element */
      int32       nentries;     /* Numer of entries */
      DFANdirentry *entries;  /* actually an arbitrary size array */
  }
DFANdirhead;

#endif /* DFAN_H */