path: root/src/H5Goh.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * 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://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/****************/
/* Module Setup */
/****************/

#include "H5Gmodule.h"          /* This source code file is part of the H5G module */
#define H5O_FRIEND		/*suppress error about including H5Opkg	  */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Gpkg.h"             /* Groups				*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5Opkg.h"             /* Object headers			*/


/****************/
/* Local Macros */
/****************/


/******************/
/* Local Typedefs */
/******************/


/********************/
/* Local Prototypes */
/********************/

static void *H5O_group_get_copy_file_udata(void);
static void H5O_group_free_copy_file_udata(void *udata);
static htri_t H5O_group_isa(H5O_t *loc);
static hid_t H5O_group_open(const H5G_loc_t *obj_loc, hid_t lapl_id,
    hid_t dxpl_id, hbool_t app_ref);
static void *H5O_group_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc,
    hid_t dxpl_id);
static H5O_loc_t *H5O_group_get_oloc(hid_t obj_id);
static herr_t H5O_group_bh_info(const H5O_loc_t *loc, hid_t dxpl_id, H5O_t *oh,
    H5_ih_info_t *bh_info);


/*********************/
/* 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	*/
    H5O_group_get_copy_file_udata, /* get 'copy file' user data	*/
    H5O_group_free_copy_file_udata, /* free 'copy file' user data */
    H5O_group_isa, 		/* "isa" message		*/
    H5O_group_open, 		/* open an object of this class */
    H5O_group_create, 		/* create an object of this class */
    H5O_group_get_oloc,		/* get an object header location for an object */
    H5O_group_bh_info, 		/* get the index & heap info for an object */
    NULL 			/* flush an opened object of this class */
}};

/* Declare the external free list to manage the H5O_ginfo_t struct */
H5FL_DEFINE(H5G_copy_file_ud_t);


/*-------------------------------------------------------------------------
 * Function:	H5O_group_get_copy_file_udata
 *
 * Purpose:	Allocates the user data needed for copying a group's
 *		object header from file to file.
 *
 * Return:	Success:	Non-NULL pointer to user data
 *
 *		Failure:	NULL
 *
 * Programmer:	Neil Fortner
 *              Thursday, July 30, 2009
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_group_get_copy_file_udata(void)
{
    void *ret_value = NULL;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Allocate space for the 'copy file' user data for copying groups.
     * Currently this is only a ginfo, so there is no specific struct type for
     * this operation. */
    if(NULL == (ret_value = H5FL_CALLOC(H5G_copy_file_ud_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_group_get_copy_file_udata() */


/*-------------------------------------------------------------------------
 * Function:	H5O_group_free_copy_file_udata
 *
 * Purpose:	Release the user data needed for copying a group's
 *		object header from file to file.
 *
 * Return:	<none>
 *
 * Programmer:	Neil Fortner
 *              Thursday, July 30, 2009
 *
 *-------------------------------------------------------------------------
 */
static void
H5O_group_free_copy_file_udata(void *_udata)
{
    H5G_copy_file_ud_t *udata = (H5G_copy_file_ud_t *)_udata;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    HDassert(udata);

    /* Free the ginfo struct (including nested data structs) */
    H5O_msg_free(H5O_PLINE_ID, udata->common.src_pline);

    /* Release space for 'copy file' user data (ginfo struct) */
    udata = H5FL_FREE(H5G_copy_file_ud_t, udata);

    FUNC_LEAVE_NOAPI_VOID
} /* end H5O_group_free_copy_file_udata() */


/*-------------------------------------------------------------------------
 * 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 = FAIL;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    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_NOTFOUND, FAIL, "unable to read object header")
    if((linfo_exists = H5O_msg_exists_oh(oh, H5O_LINFO_ID)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, 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(const H5G_loc_t *obj_loc, hid_t H5_ATTR_UNUSED lapl_id, hid_t dxpl_id, hbool_t app_ref)
{
    H5G_t       *grp = NULL;            /* Group opened */
    hid_t	ret_value = H5I_INVALID_HID;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    HDassert(obj_loc);

    /* Open the group */
    if(NULL == (grp = H5G_open(obj_loc, dxpl_id)))
        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, app_ref)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register group")

done:
    if(ret_value < 0)
        if(grp && H5G_close(grp) < 0)
            HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to release group")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_group_open() */


/*-------------------------------------------------------------------------
 * Function:	H5O_group_create
 *
 * Purpose:	Create a group in a file
 *
 * Return:	Success:	Pointer to the group data structure
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, April 10, 2007
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_group_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc, hid_t dxpl_id)
{
    H5G_obj_create_t *crt_info = (H5G_obj_create_t *)_crt_info; /* Group creation parameters */
    H5G_t *grp = NULL;          /* New group created */
    void *ret_value = NULL;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity checks */
    HDassert(f);
    HDassert(crt_info);
    HDassert(obj_loc);

    /* Create the the group */
    if(NULL == (grp = H5G__create(f, crt_info, dxpl_id)))
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "unable to create group")

    /* Set up the new group's location */
    if(NULL == (obj_loc->oloc = H5G_oloc(grp)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "unable to get object location of group")
    if(NULL == (obj_loc->path = H5G_nameof(grp)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "unable to get path of group")

    /* Set the return value */
    ret_value = grp;

done:
    if(ret_value == NULL)
        if(grp && H5G_close(grp) < 0)
            HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, NULL, "unable to release group")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_group_create() */


/*-------------------------------------------------------------------------
 * 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 = NULL;      /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Get the group */
    if(NULL ==  (grp = (H5G_t *)H5VL_object(obj_id)))
        HGOTO_ERROR(H5E_OHDR, H5E_BADATOM, NULL, "couldn't get object from ID")

    /* Get the group's object header location */
    if(NULL == (ret_value = H5G_oloc(grp)))
        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() */


/*-------------------------------------------------------------------------
 * Function:    H5O_group_bh_info
 *
 * Purpose:     Retrieve storage for 1.8 btree and heap
 *		Retrieve storage for 1.6 btree and heap via H5G_stab_bh_info()
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Vailin Choi
 *              July 12 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_group_bh_info(const H5O_loc_t *loc, hid_t dxpl_id, H5O_t *oh, H5_ih_info_t *bh_info)
{
    htri_t	exists;                 /* Flag if header message of interest exists */
    H5HF_t      *fheap = NULL;          /* Fractal heap handle */
    H5B2_t      *bt2_name = NULL;       /* v2 B-tree handle for name index */
    H5B2_t      *bt2_corder = NULL;     /* v2 B-tree handle for creation order index */
    herr_t      ret_value = SUCCEED;  	/* Return value */

    FUNC_ENTER_NOAPI_NOINIT_TAG(dxpl_id, oh->cache_info.addr, FAIL)

    /* Sanity check */
    HDassert(loc);
    HDassert(loc->file);
    HDassert(H5F_addr_defined(loc->addr));
    HDassert(oh);
    HDassert(bh_info);

    /* Check for "new style" group info */
    if((exists = H5O_msg_exists_oh(oh, H5O_LINFO_ID)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "unable to read object header")
    if(exists > 0) {
        H5O_linfo_t linfo;          	/* Link info message */

        /* Get "new style" group info */
        if(NULL == H5O_msg_read_oh(loc->file, dxpl_id, oh, H5O_LINFO_ID, &linfo))
	    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't read LINFO message")

        /* Check if name index available */
        if(H5F_addr_defined(linfo.name_bt2_addr)) {
            /* Open the name index v2 B-tree */
            if(NULL == (bt2_name = H5B2_open(loc->file, dxpl_id, linfo.name_bt2_addr, NULL)))
                HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open v2 B-tree for name index")

            /* Get name index B-tree size */
            if(H5B2_size(bt2_name, dxpl_id, &bh_info->index_size) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve B-tree storage info for name index")
        } /* end if */

        /* Check if creation order index available */
	if(H5F_addr_defined(linfo.corder_bt2_addr)) {
            /* Open the creation order index v2 B-tree */
            if(NULL == (bt2_corder = H5B2_open(loc->file, dxpl_id, linfo.corder_bt2_addr, NULL)))
                HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open v2 B-tree for creation order index")

            /* Get creation order index B-tree size */
            if(H5B2_size(bt2_corder, dxpl_id, &bh_info->index_size) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve B-tree storage info for creation order index")
        } /* end if */

        /* Get fractal heap size, if available */
        if(H5F_addr_defined(linfo.fheap_addr)) {
            /* Open the fractal heap for links */
            if(NULL == (fheap = H5HF_open(loc->file, dxpl_id, linfo.fheap_addr)))
                HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")

            /* Get heap storage size */
            if(H5HF_size(fheap, dxpl_id, &bh_info->heap_size) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve fractal heap storage info")
        } /* end if */
    } /* end if */
    else {
        H5O_stab_t          stab;       	/* Info about symbol table */

        /* Must be "old style" group, get symbol table message */
        if(NULL == H5O_msg_read_oh(loc->file, dxpl_id, oh, H5O_STAB_ID, &stab))
	    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't find LINFO nor STAB messages")

        /* Get symbol table size info */
        if(H5G__stab_bh_size(loc->file, dxpl_id, &stab, bh_info) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve symbol table size info")
    } /* end else */

done:
    /* Release resources */
    if(fheap && H5HF_close(fheap, dxpl_id) < 0)
        HDONE_ERROR(H5E_SYM, H5E_CANTCLOSEOBJ, FAIL, "can't close fractal heap")
    if(bt2_name && H5B2_close(bt2_name, dxpl_id) < 0)
        HDONE_ERROR(H5E_SYM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for name index")
    if(bt2_corder && H5B2_close(bt2_corder, dxpl_id) < 0)
        HDONE_ERROR(H5E_SYM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for creation order index")

    FUNC_LEAVE_NOAPI_TAG(ret_value, FAIL)
} /* end H5O_group_bh_info() */