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/****************************************************************************
* NCSA HDF *
* Software Development Group *
* National Center for Supercomputing Applications *
* University of Illinois at Urbana-Champaign *
* 605 E. Springfield, Champaign IL 61820 *
* *
* For conditions of distribution and use, see the accompanying *
* hdf/COPYING file. *
* *
****************************************************************************/
/* $Id$ */
/*
* This file contains function prototypes for each exported function in
* the H5A module.
*/
#ifndef _H5Apublic_H
#define _H5Apublic_H
/* Public headers needed by this file */
#include <H5public.h>
/* Group values allowed */
typedef enum {
BADGROUP=(-1), /* Invalid Group */
H5_ERR=0, /* Group ID for Error stack objects */
H5_FILE, /* Group ID for File objects */
H5_TEMPLATE, /* Group ID for Template objects */
H5_DATATYPE, /* Group ID for Datatype objects */
H5_DATASPACE, /* Group ID for Dataspace objects */
H5_DATASET, /* Group ID for Dataset objects */
H5_DIRECTORY, /* Group ID for Directory objects */
MAXGROUP /* Highest group in group_t (Invalid as true group) */
} group_t;
/* Type of atoms to return to users */
typedef int32 hatom_t;
/* Type of the function to compare objects & keys */
typedef intn (*H5Asearch_func_t)(const VOIDP obj, const VOIDP key);
/* # of bits to use for Group ID in each atom (change if MAXGROUP>16) */
#define GROUP_BITS 4
#define GROUP_MASK 0x0F
/* # of bits to use for the Atom index in each atom (assumes 8-bit bytes) */
#define ATOM_BITS ((sizeof(hatom_t)*8)-GROUP_BITS)
#define ATOM_MASK 0x0FFFFFFF
/* Combine a Group number and an atom index into an atom */
#define MAKE_ATOM(g,i) ((((hatom_t)(g)&GROUP_MASK)<<((sizeof(hatom_t)*8)-GROUP_BITS))|((hatom_t)(i)&ATOM_MASK))
#ifdef __cplusplus
extern "C" {
#endif
/* Functions in H5A.c */
/******************************************************************************
NAME
H5Ainit_group - Initialize an atomic group
DESCRIPTION
Creates an atomic group to store atoms in. If the group has already been
initialized, this routine just increments the count of # of initializations
and returns without trying to change the size of the hash table.
RETURNS
Returns SUCCEED if successful and FAIL otherwise
*******************************************************************************/
intn H5Ainit_group(group_t grp, /* IN: Group to initialize */
intn hash_size, /* IN: Minimum hash table size to use for group */
uintn reserved /* IN: Number of hash table entries to reserve */
);
/******************************************************************************
NAME
H5Adestroy_group - Destroy an atomic group
DESCRIPTION
Destroys an atomic group which atoms are stored in. If the group still
has atoms which are registered, this routine fails. If there have been
multiple initializations of the group, this routine just decrements the
count of initializations and does not check the atoms out-standing.
RETURNS
Returns SUCCEED if successful and FAIL otherwise
*******************************************************************************/
intn H5Adestroy_group(group_t grp /* IN: Group to destroy */
);
/******************************************************************************
NAME
H5Aregister_atom - Register an object in a group and get an atom for it.
DESCRIPTION
Registers an object in a group and returns an atom for it. This routine
does _not_ check for unique-ness of the objects, if you register an object
twice, you will get two different atoms for it. This routine does make
certain that each atom in a group is unique. Atoms are created by getting
a unique number for the group the atom is in and incorporating the group
into the atom which is returned to the user.
RETURNS
Returns atom if successful and FAIL otherwise
*******************************************************************************/
hatom_t H5Aregister_atom(group_t grp, /* IN: Group to register the object in */
const VOIDP object /* IN: Object to attach to atom */
);
/******************************************************************************
NAME
H5Aatom_object - Returns to the object ptr for the atom
DESCRIPTION
Retrieves the object ptr which is associated with the atom.
RETURNS
Returns object ptr if successful and NULL otherwise
*******************************************************************************/
VOIDP H5Aatom_object(hatom_t atm /* IN: Atom to retrieve object for */
);
/******************************************************************************
NAME
H5Aatom_group - Returns to the group for the atom
DESCRIPTION
Retrieves the group which is associated with the atom.
RETURNS
Returns group if successful and FAIL otherwise
*******************************************************************************/
group_t H5Aatom_group(hatom_t atm /* IN: Atom to retrieve group for */
);
/******************************************************************************
NAME
H5Aremove_atom - Removes an atom from a group
DESCRIPTION
Removes an atom from a group.
RETURNS
Returns atom's object if successful and FAIL otherwise
*******************************************************************************/
VOIDP H5Aremove_atom(hatom_t atm /* IN: Atom to remove */
);
/******************************************************************************
NAME
H5Asearch_atom - Search for an object in a group and get it's pointer.
DESCRIPTION
Searchs for an object in a group and returns the pointer to it.
This routine calls the function pointer passed in for each object in the
group until it finds a match. Currently there is no way to resume a
search.
RETURNS
Returns pointer an atom's object if successful and NULL otherwise
*******************************************************************************/
VOIDP H5Asearch_atom(group_t grp, /* IN: Group to search for the object in */
H5Asearch_func_t func, /* IN: Ptr to the comparison function */
const VOIDP key /* IN: pointer to key to compare against */
);
/******************************************************************************
NAME
H5Ais_reserved - Check whether an atom is a reserved atom in a group
DESCRIPTION
Determines the group an atom belongs to and checks if the atom is a
reserved atom in the group.
RETURNS
Returns BTRUE/BFALSE/BFAIL
*******************************************************************************/
intn H5Ais_reserved(hatom_t atm /* IN: Group to search for the object in */
);
/******************************************************************************
NAME
H5Ashutdown - Terminate various static buffers.
DESCRIPTION
Free various buffers allocated in the H5A routines.
RETURNS
Returns SUCCEED/FAIL
*******************************************************************************/
intn H5Ashutdown(void);
#ifdef __cplusplus
}
#endif
#endif
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