path: root/src/H5Tcommit.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 Info: This module contains the functionality for committing datatypes
 *      to a file for the H5T interface.
 */

#define H5T_PACKAGE		/*suppress error about including H5Tpkg	  */

/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC	H5T_init_commit_interface


#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling			*/
#include "H5FOprivate.h"	/* File objects				*/
#include "H5Gprivate.h"		/* Groups 			  	*/
#include "H5Iprivate.h"		/* IDs					*/
#include "H5Oprivate.h"		/* Object headers			*/
#include "H5Tpkg.h"		/* Datatypes				*/

/* Static local functions */
static herr_t H5T_commit(H5G_entry_t *loc, const char *name, H5T_t *type, hid_t dxpl_id);
static H5T_t *H5T_open_oid(H5G_entry_t *ent, hid_t dxpl_id);


/*--------------------------------------------------------------------------
NAME
   H5T_init_commit_interface -- Initialize interface-specific information
USAGE
    herr_t H5T_init_commit_interface()

RETURNS
    Non-negative on success/Negative on failure
DESCRIPTION
    Initializes any interface-specific data or routines.  (Just calls
    H5T_init_iterface currently).

--------------------------------------------------------------------------*/
static herr_t
H5T_init_commit_interface(void)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_init_commit_interface)

    FUNC_LEAVE_NOAPI(H5T_init())
} /* H5T_init_commit_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5Tcommit
 *
 * Purpose:	Save a transient datatype to a file and turn the type handle
 *		into a named, immutable type.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Monday, June  1, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tcommit(hid_t loc_id, const char *name, hid_t type_id)
{
    H5G_entry_t	*loc = NULL;
    H5T_t	*type = NULL;
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_API(H5Tcommit, FAIL)
    H5TRACE3("e","isi",loc_id,name,type_id);

    /* Check arguments */
    if (NULL==(loc=H5G_loc (loc_id)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!name || !*name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")
    if(NULL == (type = H5I_object_verify(type_id, H5I_DATATYPE)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

    /* Commit the type */
    if(H5T_commit(loc, name, type, H5AC_dxpl_id) < 0)
	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to commit datatype")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Tcommit() */


/*-------------------------------------------------------------------------
 * Function:	H5T_commit
 *
 * Purpose:	Commit a type, giving it a name and causing it to become
 *		immutable.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Monday, June  1, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_commit(H5G_entry_t *loc, const char *name, H5T_t *type, hid_t dxpl_id)
{
    H5F_t	*file = NULL;
    herr_t      ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5T_commit)

    HDassert(loc);
    HDassert(name && *name);
    HDassert(type);

    /*
     * Check arguments.  We cannot commit an immutable type because H5Tclose()
     * normally fails on such types (try H5Tclose(H5T_NATIVE_INT)) but closing
     * a named type should always succeed.
     */
    if(H5T_STATE_NAMED == type->shared->state || H5T_STATE_OPEN == type->shared->state)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "datatype is already committed")
    if(H5T_STATE_IMMUTABLE == type->shared->state)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "datatype is immutable")

    /* Find the insertion file */
    if(NULL == (file = H5G_insertion_file(loc, name, dxpl_id)))
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to find insertion point")

    /* Check for a "sensible" datatype to store on disk */
    if(H5T_is_sensible(type) <= 0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "datatype is not sensible")

    /* Mark datatype as being on disk now.  This step changes the size of datatype as
     * stored on disk. */
    if(H5T_vlen_mark(type, file, H5T_VLEN_DISK) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "invalid VL location")

    /*
     * Create the object header and open it for write access. Insert the data
     * type message and then give the object header a name.
     */
    if (H5O_create (file, dxpl_id, 64, &(type->ent))<0)
	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to create datatype object header")
    if (H5O_modify (&(type->ent), H5O_DTYPE_ID, 0, H5O_FLAG_CONSTANT, H5O_UPDATE_TIME, type, dxpl_id)<0)
	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to update type header message")

    /*
     * Give the datatype a name.  That is, create and add a new object to the
     * group this datatype is being initially created in.
     */
    if(H5G_insert(loc, name, &(type->ent), dxpl_id) < 0)
	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to name datatype")
    type->shared->state = H5T_STATE_OPEN;
    type->shared->fo_count=1;

    /* Add datatype to the list of open objects in the file */
    if(H5FO_top_incr(type->ent.file, type->ent.header)<0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINC, FAIL, "can't incr object ref. count")
    if(H5FO_insert(type->ent.file, type->ent.header, type->shared)<0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINSERT, FAIL, "can't insert datatype into list of open objects")

    /* Mark datatype as being on memory now.  Since this datatype may still be used in memory
     * after committed to disk, change its size back as in memory. */
    if (H5T_vlen_mark(type, NULL, H5T_VLEN_MEMORY)<0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "cannot mark datatype in memory")

done:
    if(ret_value < 0) {
	if((type->shared->state == H5T_STATE_TRANSIENT || type->shared->state == H5T_STATE_RDONLY) && H5F_addr_defined(type->ent.header)) {
	    if(H5O_close(&(type->ent))<0)
                HDONE_ERROR(H5E_DATATYPE, H5E_CLOSEERROR, FAIL, "unable to release object header")
            if(H5O_delete(file, dxpl_id,type->ent.header)<0)
                HDONE_ERROR(H5E_DATATYPE, H5E_CANTDELETE, FAIL, "unable to delete object header")
	    type->ent.header = HADDR_UNDEF;
	} /* end if */
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5T_commit() */


/*-------------------------------------------------------------------------
 * Function:	H5Tcommitted
 *
 * Purpose:	Determines if a datatype is committed or not.
 *
 * Return:	Success:	TRUE if committed, FALSE otherwise.
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Thursday, June  4, 1998
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5Tcommitted(hid_t type_id)
{
    H5T_t	*type = NULL;
    htri_t      ret_value;       /* Return value */

    FUNC_ENTER_API(H5Tcommitted, FAIL)
    H5TRACE1("t","i",type_id);

    /* Check arguments */
    if(NULL == (type = H5I_object_verify(type_id,H5I_DATATYPE)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

    /* Set return value */
    ret_value = H5T_committed(type);

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Tcommitted() */


/*-------------------------------------------------------------------------
 * Function:	H5T_committed
 *
 * Purpose:	Determines if a datatype is committed or not.
 *
 * Return:	Success:	TRUE if committed, FALSE otherwise.
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, September 24, 2003
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5T_committed(const H5T_t *type)
{
    /* Use no-init for efficiency */
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_committed)

    HDassert(type);

    FUNC_LEAVE_NOAPI(H5T_STATE_OPEN == type->shared->state || H5T_STATE_NAMED == type->shared->state)
} /* end H5T_committed() */


/*-------------------------------------------------------------------------
 * Function:	H5T_link
 *
 * Purpose:	Adjust the link count for an object header by adding
 *		ADJUST to the link count.
 *
 * Return:	Success:	New link count
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              Friday, September 26, 2003
 *
 *-------------------------------------------------------------------------
 */
int
H5T_link(const H5T_t *type, int adjust, hid_t dxpl_id)
{
    int ret_value;      /* Return value */

    /* Use no-init for efficiency */
    FUNC_ENTER_NOAPI(H5T_link,FAIL)

    HDassert(type);

    /* Adjust the link count on the named datatype */
    if((ret_value = H5O_link(&(type->ent), adjust, dxpl_id)) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_LINK, FAIL, "unable to adjust named datatype link count")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_link() */


/*-------------------------------------------------------------------------
 * Function:	H5Topen
 *
 * Purpose:	Opens a named datatype.
 *
 * Return:	Success:	Object ID of the named datatype.
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Monday, June  1, 1998
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Topen(hid_t loc_id, const char *name)
{
    H5T_t       *type = NULL;
    H5G_entry_t	*loc = NULL;
    H5G_entry_t  ent;
    hbool_t      ent_found = FALSE;     /* Entry at 'name' found */
    hid_t        dxpl_id = H5AC_dxpl_id; /* dxpl to use to open datatype */
    hid_t        ret_value = FAIL;

    FUNC_ENTER_API(H5Topen, FAIL)
    H5TRACE2("i","is",loc_id,name);

    /* Check args */
    if (NULL==(loc=H5G_loc (loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /*
     * Find the named datatype object header and read the datatype message
     * from it.
     */
    if(H5G_find(loc, name, &ent/*out*/, dxpl_id)<0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_NOTFOUND, FAIL, "not found")
    ent_found = TRUE;

    /* Check that the object found is the correct type */
    if (H5G_get_type(&ent, dxpl_id) != H5G_TYPE)
        HGOTO_ERROR(H5E_DATASET, H5E_BADTYPE, FAIL, "not a named datatype")

    /* Open it */
    if((type = H5T_open(&ent, dxpl_id)) == NULL)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTOPENOBJ, FAIL, "unable to open named datatype")

    /* Register the type and return the ID */
    if((ret_value = H5I_register(H5I_DATATYPE, type)) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register named datatype")

done:
    if(ret_value < 0) {
        if(type != NULL)
            H5T_close(type);
        else {
            if(ent_found && ent.header)
                H5G_name_free(&ent);
        } /* end else */
    } /* end if */

    FUNC_LEAVE_API(ret_value)
} /* end H5Topen() */


/*-------------------------------------------------------------------------
 * Function:	H5T_open
 *
 * Purpose:	Open a named datatype.
 *
 * Return:	Success:	Ptr to a new datatype.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Monday, June  1, 1998
 *
 *-------------------------------------------------------------------------
 */
H5T_t *
H5T_open(H5G_entry_t *ent, hid_t dxpl_id)
{
    H5T_shared_t   *shared_fo = NULL;
    H5T_t          *dt = NULL;
    H5T_t          *ret_value;

    FUNC_ENTER_NOAPI(H5T_open, NULL)

    HDassert(ent);

    /* Check if datatype was already open */
    if((shared_fo=H5FO_opened(ent->file,ent->header))==NULL) {
        /* Clear any errors from H5FO_opened() */
        H5E_clear();

        /* Open the datatype object */
        if((dt = H5T_open_oid(ent, dxpl_id)) ==NULL)
            HGOTO_ERROR(H5E_DATATYPE, H5E_NOTFOUND, NULL, "not found")

        /* Add the datatype to the list of opened objects in the file */
        if(H5FO_insert(dt->ent.file, dt->ent.header, dt->shared)<0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINSERT, NULL, "can't insert datatype into list of open objects")

        /* Increment object count for the object in the top file */
        if(H5FO_top_incr(dt->ent.file, dt->ent.header) < 0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINC, NULL, "can't increment object count")

        /* Mark any datatypes as being in memory now */
        if (H5T_vlen_mark(dt, NULL, H5T_VLEN_MEMORY)<0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "invalid datatype location")

        dt->shared->fo_count = 1;
    } /* end if */
    else {
        if(NULL == (dt = H5FL_MALLOC(H5T_t)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "can't allocate space for datatype")

        /* Shallow copy (take ownership) of the group entry object */
        if(H5G_ent_copy(&(dt->ent),ent,H5_COPY_SHALLOW)<0)
            HGOTO_ERROR (H5E_DATATYPE, H5E_CANTCOPY, NULL, "can't copy group entry")

        dt->shared = shared_fo;

        shared_fo->fo_count++;

        /* Check if the object has been opened through the top file yet */
        if(H5FO_top_count(dt->ent.file, dt->ent.header) == 0) {
            /* Open the object through this top file */
            if(H5O_open(&(dt->ent)) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTOPENOBJ, NULL, "unable to open object header")
        } /* end if */

        /* Increment object count for the object in the top file */
        if(H5FO_top_incr(dt->ent.file, dt->ent.header) < 0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINC, NULL, "can't increment object count")
    } /* end else */

    ret_value = dt;

done:
    if(ret_value == NULL) {
        if(dt) {
            if(shared_fo == NULL)   /* Need to free shared fo */
                H5FL_FREE(H5T_shared_t, dt->shared);
            H5FL_FREE(H5T_t, dt);
        } /* end if */

        if(shared_fo)
            shared_fo->fo_count--;
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_open() */


/*-------------------------------------------------------------------------
 * Function:	H5T_open_oid
 *
 * Purpose:	Open a named datatype.
 *
 * Return:	Success:	Ptr to a new datatype.
 *
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, March 17, 1999
 *
 *-------------------------------------------------------------------------
 */
H5T_t *
H5T_open_oid (H5G_entry_t *ent, hid_t dxpl_id)
{
    H5T_t	*dt = NULL;
    H5T_t	*ret_value;

    FUNC_ENTER_NOAPI(H5T_open_oid, NULL)

    assert (ent);

    if (H5O_open (ent)<0)
	HGOTO_ERROR (H5E_DATATYPE, H5E_CANTOPENOBJ, NULL, "unable to open named data type");
    if (NULL==(dt=H5O_read (ent, H5O_DTYPE_ID, 0, NULL, dxpl_id)))
	HGOTO_ERROR (H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to load type message from object header");

    /* Mark the type as named and open */
    dt->shared->state = H5T_STATE_OPEN;

    /* Shallow copy (take ownership) of the group entry object */
    H5G_ent_copy(&(dt->ent),ent,H5_COPY_SHALLOW);

    /* Set return value */
    ret_value = dt;

done:
    if(ret_value == NULL) {
        if(dt == NULL)
            H5O_close(ent);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_open_oid() */