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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 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 the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/****************/
/* Module Setup */
/****************/
#define H5O_PACKAGE /*suppress error about including H5Opkg */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Iprivate.h" /* IDs */
#include "H5Opkg.h" /* Object headers */
/****************/
/* Local Macros */
/****************/
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Local Prototypes */
/********************/
static htri_t H5O_group_isa(H5O_t *loc);
static hid_t H5O_group_open(H5G_loc_t *obj_loc, hid_t dxpl_id);
static H5O_loc_t *H5O_group_get_oloc(hid_t obj_id);
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/* This message derives from H5O object class */
const H5O_obj_class_t H5O_OBJ_GROUP[1] = {{
H5O_TYPE_GROUP, /* object type */
"group", /* object name, for debugging */
NULL, /* get 'copy file' user data */
NULL, /* free 'copy file' user data */
H5O_group_isa, /* "isa" message */
H5O_group_open, /* open an object of this class */
H5O_group_get_oloc /* get an object header location for an object */
}};
/*-------------------------------------------------------------------------
* Function: H5O_group_isa
*
* Purpose: Determines if an object has the requisite messages for being
* a group.
*
* Return: Success: TRUE if the required group messages are
* present; FALSE otherwise.
*
* Failure: FAIL if the existence of certain messages
* cannot be determined.
*
* Programmer: Robb Matzke
* Monday, November 2, 1998
*
*-------------------------------------------------------------------------
*/
static htri_t
H5O_group_isa(struct H5O_t *oh)
{
htri_t stab_exists; /* Whether the 'stab' message is in the object header */
htri_t linfo_exists; /* Whether the 'linfo' message is in the object header */
htri_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5O_group_isa)
HDassert(oh);
/* Check for any of the messages that indicate a group */
if((stab_exists = H5O_msg_exists_oh(oh, H5O_STAB_ID)) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to read object header")
if((linfo_exists = H5O_msg_exists_oh(oh, H5O_LINFO_ID)) < 0)
HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to read object header")
ret_value = (stab_exists > 0 || linfo_exists > 0);
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_group_isa() */
/*-------------------------------------------------------------------------
* Function: H5O_group_open
*
* Purpose: Open a group at a particular location
*
* Return: Success: Open object identifier
* Failure: Negative
*
* Programmer: Quincey Koziol
* Monday, November 6, 2006
*
*-------------------------------------------------------------------------
*/
static hid_t
H5O_group_open(H5G_loc_t *obj_loc, hid_t dxpl_id)
{
H5G_t *grp = NULL; /* Group opened */
hid_t ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5O_group_open)
HDassert(obj_loc);
/* Open the group */
if((grp = H5G_open(obj_loc, dxpl_id)) == NULL)
HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open group")
/* Register an ID for the group */
if((ret_value = H5I_register(H5I_GROUP, grp)) < 0)
HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register group")
done:
if(ret_value < 0)
if(grp != NULL)
H5G_close(grp);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_group_open() */
/*-------------------------------------------------------------------------
* Function: H5O_group_get_oloc
*
* Purpose: Retrieve the object header location for an open object
*
* Return: Success: Pointer to object header location
* Failure: NULL
*
* Programmer: Quincey Koziol
* Monday, November 6, 2006
*
*-------------------------------------------------------------------------
*/
static H5O_loc_t *
H5O_group_get_oloc(hid_t obj_id)
{
H5G_t *grp; /* Group opened */
H5O_loc_t *ret_value; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5O_group_get_oloc)
/* Get the group */
if((grp = H5I_object(obj_id)) == NULL)
HGOTO_ERROR(H5E_OHDR, H5E_BADATOM, NULL, "couldn't get object from ID")
/* Get the group's object header location */
if((ret_value = H5G_oloc(grp)) == NULL)
HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, NULL, "unable to get object location from object")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_group_get_oloc() */
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