summaryrefslogtreecommitdiffstats
path: root/src/H5D.c
blob: d4b984d3eb2c6af1f4c2b9b2c4353ba52e465ea4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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 */
/****************/

#define H5D_PACKAGE		/*suppress error about including H5Dpkg	  */

/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC	H5D_init_pub_interface


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Dpkg.h"		/* Datasets 				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free lists                           */
#include "H5Iprivate.h"		/* IDs			  		*/


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


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


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


/*********************/
/* Package Variables */
/*********************/

/* Declare extern the free list to manage blocks of VL data */
H5FL_BLK_EXTERN(vlen_vl_buf);

/* Declare extern the free list to manage other blocks of VL data */
H5FL_BLK_EXTERN(vlen_fl_buf);


/*****************************/
/* Library Private Variables */
/*****************************/

/* Declare extern the free list to manage blocks of type conversion data */
H5FL_BLK_EXTERN(type_conv);


/*******************/
/* Local Variables */
/*******************/



/*--------------------------------------------------------------------------
NAME
   H5D_init_pub_interface -- Initialize interface-specific information
USAGE
    herr_t H5D_init_pub_interface()
RETURNS
    Non-negative on success/Negative on failure
DESCRIPTION
    Initializes any interface-specific data or routines.  (Just calls
    H5D_init() currently).

--------------------------------------------------------------------------*/
static herr_t
H5D_init_pub_interface(void)
{
    FUNC_ENTER_NOAPI_NOINIT

    FUNC_LEAVE_NOAPI(H5D_init())
} /* H5D_init_pub_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5Dcreate2
 *
 * Purpose:	Creates a new dataset named NAME at LOC_ID, opens the
 *		dataset for access, and associates with that dataset constant
 *		and initial persistent properties including the type of each
 *		datapoint as stored in the file (TYPE_ID), the size of the
 *		dataset (SPACE_ID), and other initial miscellaneous
 *		properties (DCPL_ID).
 *
 *		All arguments are copied into the dataset, so the caller is
 *		allowed to derive new types, data spaces, and creation
 *		parameters from the old ones and reuse them in calls to
 *		create other datasets.
 *
 * Return:	Success:	The object ID of the new dataset.  At this
 *				point, the dataset is ready to receive its
 *				raw data.  Attempting to read raw data from
 *				the dataset will probably return the fill
 *				value.	The dataset should be closed when the
 *				caller is no longer interested in it.
 *
 *		Failure:	FAIL
 *
 * Programmer:	Quincey Koziol
 *		Thursday, April 5, 2007
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dcreate2(hid_t loc_id, const char *name, hid_t type_id, hid_t space_id,
    hid_t lcpl_id, hid_t dcpl_id, hid_t dapl_id)
{
    H5G_loc_t	   loc;                 /* Object location to insert dataset into */
    H5D_t	   *dset = NULL;        /* New dataset's info */
    const H5S_t    *space;              /* Dataspace for dataset */
    hid_t           ret_value;          /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE7("i", "i*siiiii", loc_id, name, type_id, space_id, lcpl_id, dcpl_id,
             dapl_id);

    /* Check arguments */
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location ID")
    if(H5I_DATATYPE != H5I_get_type(type_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype ID")
    if(NULL == (space = (const H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace ID")

    /* Get correct property list */
    if(H5P_DEFAULT == lcpl_id)
        lcpl_id = H5P_LINK_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lcpl_id, H5P_LINK_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link creation property list")

    /* Get correct property list */
    if(H5P_DEFAULT == dcpl_id)
        dcpl_id = H5P_DATASET_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(dcpl_id, H5P_DATASET_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not dataset create property list ID")

    /* Get correct property list */
    if(H5P_DEFAULT == dapl_id)
        dapl_id = H5P_DATASET_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(dapl_id, H5P_DATASET_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not dataset access property list")

    /* Create the new dataset & get its ID */
    if(NULL == (dset = H5D__create_named(&loc, name, type_id, space, lcpl_id, dcpl_id, dapl_id, H5AC_dxpl_id)))
	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create dataset")
    if((ret_value = H5I_register(H5I_DATASET, dset, TRUE)) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "unable to register dataset")

done:
    if(ret_value < 0)
        if(dset && H5D_close(dset) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataset")

    FUNC_LEAVE_API(ret_value)
} /* end H5Dcreate2() */


/*-------------------------------------------------------------------------
 * Function:	H5Dcreate_anon
 *
 * Purpose:	Creates a new dataset named NAME at LOC_ID, opens the
 *		dataset for access, and associates with that dataset constant
 *		and initial persistent properties including the type of each
 *		datapoint as stored in the file (TYPE_ID), the size of the
 *		dataset (SPACE_ID), and other initial miscellaneous
 *		properties (DCPL_ID).
 *
 *		All arguments are copied into the dataset, so the caller is
 *		allowed to derive new types, data spaces, and creation
 *		parameters from the old ones and reuse them in calls to
 *		create other datasets.
 *
 *              The resulting ID should be linked into the file with
 *              H5Olink or it will be deleted when closed.
 *
 * Return:	Success:	The object ID of the new dataset.  At this
 *				point, the dataset is ready to receive its
 *				raw data.  Attempting to read raw data from
 *				the dataset will probably return the fill
 *				value.	The dataset should be linked into
 *                              the group hierarchy before being closed or
 *                              it will be deleted.  The dataset should be
 *                              closed when the caller is no longer interested
 *                              in it.
 *
 *		Failure:	FAIL
 *
 * Programmer:	James Laird
 *		Tuesday, January 24, 2006
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dcreate_anon(hid_t loc_id, hid_t type_id, hid_t space_id, hid_t dcpl_id,
    hid_t dapl_id)
{
    H5G_loc_t	   loc;                 /* Object location to insert dataset into */
    H5D_t	   *dset = NULL;        /* New dataset's info */
    const H5S_t    *space;              /* Dataspace for dataset */
    hid_t           ret_value;          /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE5("i", "iiiii", loc_id, type_id, space_id, dcpl_id, dapl_id);

    /* Check arguments */
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location ID")
    if(H5I_DATATYPE != H5I_get_type(type_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype ID")
    if(NULL == (space = (const H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace ID")
    if(H5P_DEFAULT == dcpl_id)
        dcpl_id = H5P_DATASET_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(dcpl_id, H5P_DATASET_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not dataset create property list ID")

    /* Get correct property list */
    if(H5P_DEFAULT == dapl_id)
        dapl_id = H5P_DATASET_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(dapl_id, H5P_DATASET_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not dataset access property list")

    /* build and open the new dataset */
    if(NULL == (dset = H5D_create(loc.oloc->file, type_id, space, dcpl_id, dapl_id, H5AC_dxpl_id)))
	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create dataset")

    /* Register the new dataset to get an ID for it */
    if((ret_value = H5I_register(H5I_DATASET, dset, TRUE)) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "unable to register dataset")

done:
    /* Release the dataset's object header, if it was created */
    if(dset) {
        H5O_loc_t *oloc;         /* Object location for dataset */

        /* Get the new dataset's object location */
        if(NULL == (oloc = H5D_oloc(dset)))
            HDONE_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "unable to get object location of dataset")

        /* Decrement refcount on dataset's object header in memory */
        if(H5O_dec_rc_by_loc(oloc, H5AC_dxpl_id) < 0)
           HDONE_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to decrement refcount on newly created object")
    } /* end if */

    /* Cleanup on failure */
    if(ret_value < 0)
        if(dset && H5D_close(dset) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataset")

    FUNC_LEAVE_API(ret_value)
} /* end H5Dcreate_anon() */


/*-------------------------------------------------------------------------
 * Function:	H5Dopen2
 *
 * Purpose:	Finds a dataset named NAME at LOC_ID, opens it, and returns
 *		its ID.	 The dataset should be close when the caller is no
 *		longer interested in it.
 *
 *              Takes a dataset access property list
 *
 * Return:	Success:	A new dataset ID
 *		Failure:	FAIL
 *
 * Programmer:	James Laird
 *		Thursday, July 27, 2006
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dopen2(hid_t loc_id, const char *name, hid_t dapl_id)
{
    H5D_t       *dset = NULL;
    H5G_loc_t	 loc;		        /* Object location of group */
    H5G_loc_t	 dset_loc;		/* Object location of dataset */
    H5G_name_t   path;            	/* Dataset group hier. path */
    H5O_loc_t    oloc;            	/* Dataset object location */
    H5O_type_t   obj_type;              /* Type of object at location */
    hbool_t      loc_found = FALSE;     /* Location at 'name' found */
    hid_t        dxpl_id = H5AC_dxpl_id;    /* dxpl to use to open datset */
    hid_t        ret_value;

    FUNC_ENTER_API(FAIL)
    H5TRACE3("i", "i*si", loc_id, name, dapl_id);

    /* Check args */
    if(H5G_loc(loc_id, &loc) < 0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /* Get correct property list */
    if(H5P_DEFAULT == dapl_id)
        dapl_id = H5P_DATASET_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(dapl_id, H5P_DATASET_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not dataset access property list")

    /* Set up dataset location to fill in */
    dset_loc.oloc = &oloc;
    dset_loc.path = &path;
    H5G_loc_reset(&dset_loc);

    /* Find the dataset object */
    if(H5G_loc_find(&loc, name, &dset_loc, dapl_id, dxpl_id) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_NOTFOUND, FAIL, "not found")
    loc_found = TRUE;

    /* Check that the object found is the correct type */
    if(H5O_obj_type(&oloc, &obj_type, dxpl_id) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get object type")
    if(obj_type != H5O_TYPE_DATASET)
        HGOTO_ERROR(H5E_DATASET, H5E_BADTYPE, FAIL, "not a dataset")

    /* Open the dataset */
    if(NULL == (dset = H5D_open(&dset_loc, dapl_id, dxpl_id)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't open dataset")

    /* Register an atom for the dataset */
    if((ret_value = H5I_register(H5I_DATASET, dset, TRUE)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "can't register dataset atom")

done:
    if(ret_value < 0) {
        if(dset) {
            if(H5D_close(dset) < 0)
                HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataset")
        } /* end if */
        else {
            if(loc_found && H5G_loc_free(&dset_loc) < 0)
                HDONE_ERROR(H5E_DATASET, H5E_CANTRELEASE, FAIL, "can't free location")
        } /* end else */
    } /* end if */

    FUNC_LEAVE_API(ret_value)
} /* end H5Dopen2() */


/*-------------------------------------------------------------------------
 * Function:	H5Dclose
 *
 * Purpose:	Closes access to a dataset (DATASET_ID) and releases
 *		resources used by it. It is illegal to subsequently use that
 *		same dataset ID in calls to other dataset functions.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dclose(hid_t dset_id)
{
    herr_t       ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("e", "i", dset_id);

    /* Check args */
    if(NULL == H5I_object_verify(dset_id, H5I_DATASET))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset")

    /*
     * Decrement the counter on the dataset.  It will be freed if the count
     * reaches zero.  
     *
     * Pass in TRUE for the 3rd parameter to tell the function to remove
     * dataset's ID even though the freeing function might fail.  Please
     * see the comments in H5I_dec_ref for details. (SLU - 2010/9/7)
     */
    if(H5I_dec_app_ref_always_close(dset_id) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "can't decrement count on dataset ID")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Dclose() */


/*-------------------------------------------------------------------------
 * Function:	H5Dget_space
 *
 * Purpose:	Returns a copy of the file data space for a dataset.
 *
 * Return:	Success:	ID for a copy of the data space.  The data
 *				space should be released by calling
 *				H5Sclose().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke
 *		Wednesday, January 28, 1998
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dget_space(hid_t dset_id)
{
    H5D_t	*dset = NULL;
    H5S_t	*space = NULL;
    hid_t	ret_value;

    FUNC_ENTER_API(FAIL)
    H5TRACE1("i", "i", dset_id);

    /* Check args */
    if(NULL == (dset = (H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset")

    /* Read the data space message and return a data space object */
    if(NULL == (space = H5S_copy(dset->shared->space, FALSE, TRUE)))
	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to get data space")

    /* Create an atom */
    if((ret_value = H5I_register (H5I_DATASPACE, space, TRUE)) < 0)
	HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register data space")

done:
    if(ret_value < 0) {
        if(space!=NULL) {
            if(H5S_close(space) < 0)
                HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataspace")
        } /* end if */
    } /* end if */

    FUNC_LEAVE_API(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5Dget_space_status
 *
 * Purpose:	Returns the status of data space allocation.
 *
 * Return:
 *		Success:	Non-negative
 *
 *		Failture:	Negative
 *
 * Programmer:	Raymond Lu
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dget_space_status(hid_t dset_id, H5D_space_status_t *allocation)
{
    H5D_t 	*dset = NULL;
    herr_t 	ret_value = SUCCEED;

    FUNC_ENTER_API(FAIL)
    H5TRACE2("e", "i*Ds", dset_id, allocation);

    /* Check arguments */
    if(NULL==(dset=(H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset")

    /* Read data space address and return */
    if(FAIL==(ret_value=H5D_get_space_status(dset, allocation, H5AC_ind_dxpl_id)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to get space status")

done:
    FUNC_LEAVE_API(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5Dget_type
 *
 * Purpose:	Returns a copy of the file datatype for a dataset.
 *
 * Return:	Success:	ID for a copy of the datatype.	 The data
 *				type should be released by calling
 *				H5Tclose().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke
 *		Tuesday, February  3, 1998
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dget_type(hid_t dset_id)
{

    H5D_t	*dset;                  /* Dataset */
    H5T_t	*dt = NULL;             /* Datatype to return */
    hid_t	ret_value;              /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("i", "i", dset_id);

    /* Check args */
    if(NULL == (dset = (H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset")

    /* Patch the datatype's "top level" file pointer */
    if(H5T_patch_file(dset->shared->type, dset->oloc.file) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to patch datatype's file pointer")

    /* Copy the dataset's datatype */
    if(NULL == (dt = H5T_copy(dset->shared->type, H5T_COPY_REOPEN)))
	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to copy datatype")

    /* Mark any datatypes as being in memory now */
    if(H5T_set_loc(dt, NULL, H5T_LOC_MEMORY) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "invalid datatype location")

    /* Lock copied type */
    if(H5T_lock(dt, FALSE) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to lock transient datatype")

    /* Create an atom */
    if((ret_value = H5I_register(H5I_DATATYPE, dt, TRUE)) < 0)
	HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register datatype")

done:
    if(ret_value < 0) {
        if(dt && H5T_close(dt) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release datatype")
    } /* end if */

    FUNC_LEAVE_API(ret_value)
} /* end H5Dget_type() */


/*-------------------------------------------------------------------------
 * Function:	H5Dget_create_plist
 *
 * Purpose:	Returns a copy of the dataset creation property list.
 *
 * Return:	Success:	ID for a copy of the dataset creation
 *				property list.  The template should be
 *				released by calling H5P_close().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke
 *		Tuesday, February  3, 1998
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dget_create_plist(hid_t dset_id)
{
    H5D_t		*dset;                  /* Dataset structure */
    H5P_genplist_t      *dcpl_plist;            /* Dataset's DCPL */
    H5P_genplist_t      *new_plist;             /* Copy of dataset's DCPL */
    H5O_fill_t          copied_fill;            /* Fill value to tweak */
    hid_t		new_dcpl_id = FAIL;
    hid_t		ret_value;              /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("i", "i", dset_id);

    /* Check args */
    if(NULL == (dset = (H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset")
    if(NULL == (dcpl_plist = (H5P_genplist_t *)H5I_object(dset->shared->dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't get property list")

    /* Copy the creation property list */
    if((new_dcpl_id = H5P_copy_plist(dcpl_plist, TRUE)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "unable to copy the creation property list")
    if(NULL == (new_plist = (H5P_genplist_t *)H5I_object(new_dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't get property list")

    /* Retrieve any object creation properties */
    if(H5O_get_create_plist(&dset->oloc, H5AC_ind_dxpl_id, new_plist) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get object creation info")

    /* Get the fill value property */
    if(H5P_get(new_plist, H5D_CRT_FILL_VALUE_NAME, &copied_fill) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get fill value")

    /* Check if there is a fill value, but no type yet */
    if(copied_fill.buf != NULL && copied_fill.type == NULL) {
        H5T_path_t *tpath;      /* Conversion information*/

        /* Copy the dataset type into the fill value message */
        if(NULL == (copied_fill.type = H5T_copy(dset->shared->type, H5T_COPY_TRANSIENT)))
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to copy dataset datatype for fill value")

        /* Set up type conversion function */
        if(NULL == (tpath = H5T_path_find(dset->shared->type, copied_fill.type, NULL, NULL, H5AC_ind_dxpl_id, FALSE)))
            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dest data types")

        /* Convert disk form of fill value into memory form */
        if(!H5T_path_noop(tpath)) {
            hid_t dst_id, src_id;       /* Source & destination datatypes for type conversion */
            uint8_t *bkg_buf = NULL;    /* Background conversion buffer */
            size_t bkg_size;            /* Size of background buffer */

            /* Wrap copies of types to convert */
            dst_id = H5I_register(H5I_DATATYPE, H5T_copy(copied_fill.type, H5T_COPY_TRANSIENT), FALSE);
            if(dst_id < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to copy/register datatype")
            src_id = H5I_register(H5I_DATATYPE, H5T_copy(dset->shared->type, H5T_COPY_ALL), FALSE);
            if(src_id < 0) {
                H5I_dec_ref(dst_id);
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to copy/register datatype")
            } /* end if */

            /* Allocate a background buffer */
            bkg_size = MAX(H5T_GET_SIZE(copied_fill.type), H5T_GET_SIZE(dset->shared->type));
            if(H5T_path_bkg(tpath) && NULL == (bkg_buf = H5FL_BLK_CALLOC(type_conv, bkg_size))) {
                H5I_dec_ref(src_id);
                H5I_dec_ref(dst_id);
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
            } /* end if */

            /* Convert fill value */
            if(H5T_convert(tpath, src_id, dst_id, (size_t)1, (size_t)0, (size_t)0, copied_fill.buf, bkg_buf, H5AC_ind_dxpl_id) < 0) {
                H5I_dec_ref(src_id);
                H5I_dec_ref(dst_id);
                if(bkg_buf)
                    bkg_buf = H5FL_BLK_FREE(type_conv, bkg_buf);
                HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, FAIL, "datatype conversion failed")
            } /* end if */

            /* Release local resources */
            if(H5I_dec_ref(src_id) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to close temporary object")
            if(H5I_dec_ref(dst_id) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to close temporary object")
            if(bkg_buf)
                bkg_buf = H5FL_BLK_FREE(type_conv, bkg_buf);
        } /* end if */
    } /* end if */

    /* Set back the fill value property to property list */
    if(H5P_set(new_plist, H5D_CRT_FILL_VALUE_NAME, &copied_fill) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "unable to set property list fill value")

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

done:
    if(ret_value < 0)
        if(new_dcpl_id > 0)
            if(H5I_dec_app_ref(new_dcpl_id) < 0)
                HDONE_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to close temporary object")

    FUNC_LEAVE_API(ret_value)
} /* end H5Dget_create_plist() */


/*-------------------------------------------------------------------------
 * Function:	H5Dget_access_plist
 *
 * Purpose:	Returns a copy of the dataset creation property list.
 *
 * Description: H5Dget_access_plist returns the dataset access property
 *      list identifier of the specified dataset.
 *
 *      The chunk cache parameters in the returned property lists will be
 *      those used by the dataset.  If the properties in the file access
 *      property list were used to determine the dataset’s chunk cache
 *      configuration, then those properties will be present in the
 *      returned dataset access property list.  If the dataset does not
 *      use a chunked layout, then the chunk cache properties will be set
 *      to the default.  The chunk cache properties in the returned list
 *      are considered to be “set”, and any use of this list will override
 *      the corresponding properties in the file’s file access property
 *      list.
 *
 *      All link access properties in the returned list will be set to the
 *      default values.
 *
 * Return:	Success:	ID for a copy of the dataset access
 *				property list.  The template should be
 *				released by calling H5Pclose().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Neil Fortner
 *		Wednesday, October 29, 2008
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dget_access_plist(hid_t dset_id)
{
    H5D_t           *dset;          /* Dataset structure */
    H5P_genplist_t  *old_plist;     /* Default DAPL */
    H5P_genplist_t  *new_plist;     /* New DAPL */
    hid_t           new_dapl_id = FAIL;
    hid_t           ret_value;      /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("i", "i", dset_id);

    /* Check args */
    if (NULL == (dset = (H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset")

    /* Make a copy of the default dataset access property list */
    if (NULL == (old_plist = (H5P_genplist_t *)H5I_object(H5P_LST_DATASET_ACCESS_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
    if ((new_dapl_id = H5P_copy_plist(old_plist, TRUE)) < 0)
        HGOTO_ERROR(H5E_INTERNAL, H5E_CANTINIT, FAIL, "can't copy dataset access property list")
    if (NULL == (new_plist = (H5P_genplist_t *)H5I_object(new_dapl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")

    /* If the dataset is chunked then copy the rdcc parameters */
    if (dset->shared->layout.type == H5D_CHUNKED) {
        if (H5P_set(new_plist, H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME, &(dset->shared->cache.chunk.nslots)) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set data cache number of slots")
        if (H5P_set(new_plist, H5D_ACS_DATA_CACHE_BYTE_SIZE_NAME, &(dset->shared->cache.chunk.nbytes_max)) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set data cache byte size")
        if (H5P_set(new_plist, H5D_ACS_PREEMPT_READ_CHUNKS_NAME, &(dset->shared->cache.chunk.w0)) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set preempt read chunks")
    } /* end if */

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

done:
    if(ret_value < 0)
        if(new_dapl_id >= 0)
            if(H5I_dec_app_ref(new_dapl_id) < 0)
                HDONE_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to close temporary object")

    FUNC_LEAVE_API(ret_value)
} /* end H5Dget_access_plist() */


/*-------------------------------------------------------------------------
 * Function:	H5Dget_storage_size
 *
 * Purpose:	Returns the amount of storage that is required for the
 *		dataset. For chunked datasets this is the number of allocated
 *		chunks times the chunk size.
 *
 * Return:	Success:	The amount of storage space allocated for the
 *				dataset, not counting meta data. The return
 *				value may be zero if no data has been stored.
 *
 *		Failure:	Zero
 *
 * Programmer:	Robb Matzke
 *              Wednesday, April 21, 1999
 *
 *-------------------------------------------------------------------------
 */
hsize_t
H5Dget_storage_size(hid_t dset_id)
{
    H5D_t	*dset;          /* Dataset to query */
    hsize_t	ret_value;      /* Return value */

    FUNC_ENTER_API(0)
    H5TRACE1("h", "i", dset_id);

    /* Check args */
    if(NULL == (dset = (H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a dataset")

    /* Set return value */
    ret_value = H5D_get_storage_size(dset, H5AC_ind_dxpl_id);

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Dget_storage_size() */


/*-------------------------------------------------------------------------
 * Function:	H5Dget_offset
 *
 * Purpose:	Returns the address of dataset in file.
 *
 * Return:	Success:        the address of dataset
 *
 *		Failure:	HADDR_UNDEF
 *
 * Programmer:  Raymond Lu
 *              November 6, 2002
 *
 *-------------------------------------------------------------------------
 */
haddr_t
H5Dget_offset(hid_t dset_id)
{
    H5D_t	*dset;          /* Dataset to query */
    haddr_t	ret_value;      /* Return value */

    FUNC_ENTER_API(HADDR_UNDEF)
    H5TRACE1("a", "i", dset_id);

    /* Check args */
    if(NULL == (dset = (H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, HADDR_UNDEF, "not a dataset")

    /* Set return value */
    ret_value = H5D_get_offset(dset);

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Dget_offset() */


/*-------------------------------------------------------------------------
 * Function:	H5Diterate
 *
 * Purpose:	This routine iterates over all the elements selected in a memory
 *      buffer.  The callback function is called once for each element selected
 *      in the dataspace.  The selection in the dataspace is modified so
 *      that any elements already iterated over are removed from the selection
 *      if the iteration is interrupted (by the H5D_operator_t function
 *      returning non-zero) in the "middle" of the iteration and may be
 *      re-started by the user where it left off.
 *
 *      NOTE: Until "subtracting" elements from a selection is implemented,
 *          the selection is not modified.
 *
 * Parameters:
 *      void *buf;          IN/OUT: Pointer to the buffer in memory containing
 *                              the elements to iterate over.
 *      hid_t type_id;      IN: Datatype ID for the elements stored in BUF.
 *      hid_t space_id;     IN: Dataspace ID for BUF, also contains the
 *                              selection to iterate over.
 *      H5D_operator_t op; IN: Function pointer to the routine to be
 *                              called for each element in BUF iterated over.
 *      void *operator_data;    IN/OUT: Pointer to any user-defined data
 *                              associated with the operation.
 *
 * Operation information:
 *      H5D_operator_t is defined as:
 *          typedef herr_t (*H5D_operator_t)(void *elem, hid_t type_id,
 *              unsigned ndim, const hsize_t *point, void *operator_data);
 *
 *      H5D_operator_t parameters:
 *          void *elem;         IN/OUT: Pointer to the element in memory containing
 *                                  the current point.
 *          hid_t type_id;      IN: Datatype ID for the elements stored in ELEM.
 *          unsigned ndim;       IN: Number of dimensions for POINT array
 *          const hsize_t *point; IN: Array containing the location of the element
 *                                  within the original dataspace.
 *          void *operator_data;    IN/OUT: Pointer to any user-defined data
 *                                  associated with the operation.
 *
 *      The return values from an operator are:
 *          Zero causes the iterator to continue, returning zero when all
 *              elements have been processed.
 *          Positive causes the iterator to immediately return that positive
 *              value, indicating short-circuit success.  The iterator can be
 *              restarted at the next element.
 *          Negative causes the iterator to immediately return that value,
 *              indicating failure. The iterator can be restarted at the next
 *              element.
 *
 * Return:	Returns the return value of the last operator if it was non-zero,
 *          or zero if all elements were processed. Otherwise returns a
 *          negative value.
 *
 * Programmer:	Quincey Koziol
 *              Friday, June 11, 1999
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Diterate(void *buf, hid_t type_id, hid_t space_id, H5D_operator_t op,
        void *operator_data)
{
    H5S_t *space;               /* Dataspace for iteration */
    herr_t ret_value;           /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE5("e", "*xiix*x", buf, type_id, space_id, op, operator_data);

    /* Check args */
    if(NULL == op)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid operator")
    if(NULL == buf)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid buffer")
    if(H5I_DATATYPE != H5I_get_type(type_id))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid datatype")
    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid dataspace")
    if(!(H5S_has_extent(space)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "dataspace does not have extent set")

    ret_value = H5D_iterate(buf, type_id, space, op, operator_data);

done:
    FUNC_LEAVE_API(ret_value)
}   /* end H5Diterate() */


/*-------------------------------------------------------------------------
 * Function:	H5Dvlen_reclaim
 *
 * Purpose:	Frees the buffers allocated for storing variable-length data
 *      in memory.  Only frees the VL data in the selection defined in the
 *      dataspace.  The dataset transfer property list is required to find the
 *      correct allocation/free methods for the VL data in the buffer.
 *
 * Return:	Non-negative on success, negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Thursday, June 10, 1999
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dvlen_reclaim(hid_t type_id, hid_t space_id, hid_t plist_id, void *buf)
{
    H5S_t *space;               /* Dataspace for iteration */
    herr_t ret_value;           /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE4("e", "iii*x", type_id, space_id, plist_id, buf);

    /* Check args */
    if(H5I_DATATYPE != H5I_get_type(type_id) || buf == NULL)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid argument")
    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid dataspace")
    if(!(H5S_has_extent(space)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "dataspace does not have extent set")

    /* Get the default dataset transfer property list if the user didn't provide one */
    if(H5P_DEFAULT == plist_id)
        plist_id = H5P_DATASET_XFER_DEFAULT;
    else
        if(TRUE != H5P_isa_class(plist_id, H5P_DATASET_XFER))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not xfer parms")

    /* Call internal routine */
    ret_value = H5D_vlen_reclaim(type_id, space, plist_id, buf);

done:
    FUNC_LEAVE_API(ret_value)
}   /* end H5Dvlen_reclaim() */


/*-------------------------------------------------------------------------
 * Function:	H5Dvlen_get_buf_size
 *
 * Purpose:	This routine checks the number of bytes required to store the VL
 *      data from the dataset, using the space_id for the selection in the
 *      dataset on disk and the type_id for the memory representation of the
 *      VL data, in memory.  The *size value is modified according to how many
 *      bytes are required to store the VL data in memory.
 *
 * Implementation: This routine actually performs the read with a custom
 *      memory manager which basically just counts the bytes requested and
 *      uses a temporary memory buffer (through the H5FL API) to make certain
 *      enough space is available to perform the read.  Then the temporary
 *      buffer is released and the number of bytes allocated is returned.
 *      Kinda kludgy, but easier than the other method of trying to figure out
 *      the sizes without actually reading the data in... - QAK
 *
 * Return:	Non-negative on success, negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, August 11, 1999
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dvlen_get_buf_size(hid_t dataset_id, hid_t type_id, hid_t space_id,
        hsize_t *size)
{
    H5D_vlen_bufsize_t vlen_bufsize = {0, 0, 0, 0, 0, 0, 0};
    char bogus;                 /* bogus value to pass to H5Diterate() */
    H5S_t *space;               /* Dataspace for iteration */
    H5P_genclass_t  *pclass;    /* Property class */
    H5P_genplist_t  *plist;     /* Property list */
    herr_t ret_value;           /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE4("e", "iii*h", dataset_id, type_id, space_id, size);

    /* Check args */
    if(H5I_DATASET != H5I_get_type(dataset_id) ||
            H5I_DATATYPE != H5I_get_type(type_id) || size == NULL)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid argument")
    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid dataspace")
    if(!(H5S_has_extent(space)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "dataspace does not have extent set")

    /* Save the dataset ID */
    vlen_bufsize.dataset_id = dataset_id;

    /* Get a copy of the dataspace ID */
    if((vlen_bufsize.fspace_id = H5Dget_space(dataset_id)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't copy dataspace")

    /* Create a scalar for the memory dataspace */
    if((vlen_bufsize.mspace_id = H5Screate(H5S_SCALAR)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't create dataspace")

    /* Grab the temporary buffers required */
    if(NULL == (vlen_bufsize.fl_tbuf = H5FL_BLK_MALLOC(vlen_fl_buf, (size_t)1)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "no temporary buffers available")
    if(NULL == (vlen_bufsize.vl_tbuf = H5FL_BLK_MALLOC(vlen_vl_buf, (size_t)1)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "no temporary buffers available")

    /* Get the pointer to the dataset transfer class */
    if(NULL == (pclass = (H5P_genclass_t *)H5I_object(H5P_CLS_DATASET_XFER_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list class")

    /* Change to the custom memory allocation routines for reading VL data */
    if((vlen_bufsize.xfer_pid = H5P_create_id(pclass, FALSE)) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTCREATE, FAIL, "no dataset xfer plists available")

    /* Get the property list struct */
    if(NULL == (plist = (H5P_genplist_t *)H5I_object(vlen_bufsize.xfer_pid)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset transfer property list")

    /* Set the memory manager to the special allocation routine */
    if(H5P_set_vlen_mem_manager(plist, H5D_vlen_get_buf_size_alloc, &vlen_bufsize, NULL, NULL) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "can't set VL data allocation routine")

    /* Set the initial number of bytes required */
    vlen_bufsize.size = 0;

    /* Call H5D_iterate with args, etc. */
    ret_value = H5D_iterate(&bogus, type_id, space, H5D_vlen_get_buf_size, &vlen_bufsize);

    /* Get the size if we succeeded */
    if(ret_value >= 0)
        *size = vlen_bufsize.size;

done:
    if(vlen_bufsize.fspace_id > 0 && H5I_dec_ref(vlen_bufsize.fspace_id) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataspace")
    if(vlen_bufsize.mspace_id > 0 && H5I_dec_ref(vlen_bufsize.mspace_id) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataspace")
    if(vlen_bufsize.fl_tbuf != NULL)
        vlen_bufsize.fl_tbuf = H5FL_BLK_FREE(vlen_fl_buf, vlen_bufsize.fl_tbuf);
    if(vlen_bufsize.vl_tbuf != NULL)
        vlen_bufsize.vl_tbuf = H5FL_BLK_FREE(vlen_vl_buf, vlen_bufsize.vl_tbuf);
    if(vlen_bufsize.xfer_pid > 0 && H5I_dec_ref(vlen_bufsize.xfer_pid) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to decrement ref count on property list")

    FUNC_LEAVE_API(ret_value)
}   /* end H5Dvlen_get_buf_size() */


/*-------------------------------------------------------------------------
 * Function:	H5Dset_extent
 *
 * Purpose:	Modifies the dimensions of a dataset.
 *		Can change to a smaller dimension.
 *
 * Return:	Non-negative on success, negative on failure
 *
 * Programmer:  Pedro Vicente, pvn@ncsa.uiuc.edu
 *              April 9, 2002
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dset_extent(hid_t dset_id, const hsize_t size[])
{
    H5D_t *dset;                /* Dataset for this operation */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE2("e", "i*h", dset_id, size);

    /* Check args */
    if(NULL == (dset = (H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset")
    if(!size)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no size specified")

    /* Private function */
    if(H5D_set_extent(dset, size, H5AC_dxpl_id) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to set extend dataset")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Dset_extent() */