summaryrefslogtreecommitdiffstats
path: root/src/H5Gobj.c
blob: af8f6df5975e2b38673c391b9dd6dc23d0e51b7b (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
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:		H5Gobj.c
 *			Sep  5 2005
 *			Quincey Koziol <koziol@ncsa.uiuc.edu>
 *
 * Purpose:		Functions for abstract handling of objects in groups.
 *
 *-------------------------------------------------------------------------
 */

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

#define H5F_PACKAGE		/*suppress error about including H5Fpkg	  */
#define H5G_PACKAGE		/*suppress error about including H5Gpkg  */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Fpkg.h"		/* File access				*/
#include "H5Gpkg.h"		/* Groups		  		*/
#include "H5HLprivate.h"	/* Local Heaps				*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5Lprivate.h"         /* Links			  	*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Pprivate.h"         /* Property Lists			*/


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


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

/* User data for object header iterator when converting link messages to dense
 * link storage
 */
typedef struct {
    H5F_t      *f;              /* Pointer to file for insertion */
    hid_t       dxpl_id;        /* DXPL during insertion */
    H5O_linfo_t *linfo;         /* Pointer to link info */
} H5G_obj_oh_it_ud1_t;

/* User data for link iterator when converting dense link storage to link
 * messages
 */
typedef struct {
    H5O_link_t *lnk_table;              /* Array of links to convert */
    size_t nlinks;                      /* Number of links converted */
    size_t alloc_links;                 /* Size of link table        */
} H5G_obj_lnk_it_ud1_t;

/* User data for symbol table iterator when converting old-format group to
 * a new-format group
 */
typedef struct {
    const H5O_loc_t   *grp_oloc;              /* Pointer to group for insertion */
    hid_t       dxpl_id;                /* DXPL during insertion */
} H5G_obj_stab_it_ud1_t;

/********************/
/* Package Typedefs */
/********************/


/********************/
/* Local Prototypes */
/********************/
static herr_t H5G_obj_compact_to_dense_cb(const void *_mesg, unsigned idx,
    void *_udata);
static herr_t H5G_obj_remove_update_linfo(H5O_loc_t *oloc, H5O_linfo_t *linfo,
    hid_t dxpl_id);


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


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


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



/*-------------------------------------------------------------------------
 * Function:    H5G_obj_create
 *
 * Purpose:     Create an object header for a group and update object location info
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              koziol@ncsa.uiuc.edu
 *              Sep 29 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_create(H5F_t *f, hid_t dxpl_id, const H5O_ginfo_t *ginfo,
    const H5O_linfo_t *linfo, hid_t gcpl_id, H5O_loc_t *oloc/*out*/)
{
    size_t hdr_size;                    /* Size of object header to request */
    hbool_t use_latest_format;          /* Flag indicating the new group format should be used */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_create, FAIL)

    /*
     * Check arguments.
     */
    HDassert(f);
    HDassert(ginfo);
    HDassert(oloc);

    /* Check for using the latest version of the group format */
    /* (add more checks for creating "new format" groups when needed) */
    if(H5F_USE_LATEST_FORMAT(f) || linfo->track_corder)
        use_latest_format = TRUE;
    else
        use_latest_format = FALSE;

    /* Make certain that the creation order is being tracked if an index is
     *  going to be built on it.
     */
    if(linfo->index_corder && !linfo->track_corder)
	HGOTO_ERROR(H5E_SYM, H5E_BADVALUE, FAIL, "must track creation order to create index for it")

    /* Check if we should be using the latest version of the group format */
    if(use_latest_format) {
        H5O_link_t lnk;                     /* Temporary link message info for computing message size */
        char null_char = '\0';              /* Character for creating null string */
        size_t ginfo_size;                  /* Size of the group info message */
        size_t linfo_size;                  /* Size of the link info message */
        size_t link_size;                   /* Size of a link message */

        /* Calculate message size infomation, for creating group's object header */
        linfo_size = H5O_msg_size_f(f, gcpl_id, H5O_LINFO_ID, linfo, (size_t)0);
        HDassert(linfo_size);

        ginfo_size = H5O_msg_size_f(f, gcpl_id, H5O_GINFO_ID, ginfo, (size_t)0);
        HDassert(ginfo_size);

        lnk.type = H5L_TYPE_HARD;
        lnk.corder = 0;
        lnk.corder_valid = linfo->track_corder;
        lnk.cset = H5T_CSET_ASCII;
        lnk.name = &null_char;
        link_size = H5O_msg_size_f(f, gcpl_id, H5O_LINK_ID, &lnk, (size_t)ginfo->est_name_len);
        HDassert(link_size);

        /* Compute size of header to use for creation */
        hdr_size = linfo_size +
                    ginfo_size +
                    (ginfo->est_num_entries * link_size);
    } /* end if */
    else 
        hdr_size = 4 + 2 * H5F_SIZEOF_ADDR(f);

    /*
     * Create group's object header.  It has a zero link count
     * since nothing refers to it yet.	The link count will be
     * incremented if the object is added to the group directed graph.
     */
    if(H5O_create(f, dxpl_id, hdr_size, gcpl_id, oloc/*out*/) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create header")

    /* Check for format of group to create */
    if(use_latest_format) {
        /* Insert link info message */
        if(H5O_msg_create(oloc, H5O_LINFO_ID, 0, 0, linfo, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create message")

        /* Insert group info message */
        if(H5O_msg_create(oloc, H5O_GINFO_ID, H5O_MSG_FLAG_CONSTANT, H5O_UPDATE_TIME, ginfo, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create message")
    } /* end if */
    else {
        H5O_stab_t	stab;		/* Symbol table message	*/

        /* The group doesn't currently have a 'stab' message, go create one */
        if(H5G_stab_create(oloc, dxpl_id, ginfo, &stab) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create symbol table")
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_create() */


/*-------------------------------------------------------------------------
 * Function:    H5G_obj_ent_decode
 *
 * Purpose:     Decodes a symbol table entry into a object location
 *
 * Return:      Success:        Non-negative with *pp pointing to the first byte
 *                              following the symbol table entry.
 *
 *              Failure:        Negative
 *
 * Programmer:  Quincey Koziol
 *              koziol@ncsa.uiuc.edu
 *              Sep 26 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_ent_decode(H5F_t *f, const uint8_t **pp, H5O_loc_t *oloc)
{
    const uint8_t	*p_ret = *pp;

    FUNC_ENTER_NOAPI_NOFUNC(H5G_obj_ent_decode)

    /* check arguments */
    HDassert(f);
    HDassert(pp);
    HDassert(oloc);

    /* Set file pointer for root object location */
    oloc->file = f;
    oloc->holding_file = FALSE;

    /* decode header */
    *pp += H5F_SIZEOF_SIZE(f);          /* Skip over local heap address */
    H5F_addr_decode(f, pp, &(oloc->addr));
    *pp += 4;                           /* Skip over "cache type" */
    *pp += 4;                           /* Reserved */

    /* Set decode pointer */
    *pp = p_ret + H5G_SIZEOF_ENTRY(f);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5G_obj_ent_decode() */


/*-------------------------------------------------------------------------
 * Function:    H5G_obj_ent_encode
 *
 * Purpose:     Encodes the specified object location into a symbol table
 *              entry in the buffer pointed to by *pp.
 *
 * Return:      Success:        Non-negative, with *pp pointing to the first byte
 *                              after the symbol table entry.
 *
 *              Failure:        Negative
 *
 * Programmer:  Quincey Koziol
 *              koziol@ncsa.uiuc.edu
 *              Sep 26 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_ent_encode(const H5F_t *f, uint8_t **pp, const H5O_loc_t *oloc)
{
    uint8_t		*p_ret = *pp + H5G_SIZEOF_ENTRY(f);

    FUNC_ENTER_NOAPI_NOFUNC(H5G_obj_ent_encode)

    /* check arguments */
    HDassert(f);
    HDassert(pp);

    /* encode header */
    H5F_ENCODE_LENGTH(f, *pp, 0);           /* No name for root group */
    if(oloc)
        H5F_addr_encode(f, pp, oloc->addr);
    else
        H5F_addr_encode(f, pp, HADDR_UNDEF);
    UINT32ENCODE(*pp, H5G_NOTHING_CACHED);
    UINT32ENCODE(*pp, 0); /*reserved*/

    /* fill with zero */
    while(*pp < p_ret)
        *(*pp)++ = 0;
    *pp = p_ret;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5G_obj_ent_encode() */


/*-------------------------------------------------------------------------
 * Function:    H5G_obj_get_linfo
 *
 * Purpose:     Retrieves the "link info" message for an object.  Also
 *              sets the number of links correctly, if it isn't set up yet.
 *
 * Return:	Success:	Ptr to message in native format.
 *              Failure:        NULL
 *
 * Programmer:  Quincey Koziol
 *              koziol@hdfgroup.org
 *              Mar 11 2007
 *
 *-------------------------------------------------------------------------
 */
H5O_linfo_t *
H5G_obj_get_linfo(const H5O_loc_t *grp_oloc, H5O_linfo_t *linfo, hid_t dxpl_id)
{
    H5O_linfo_t *ret_value;     /* Return value */
    
    FUNC_ENTER_NOAPI(H5G_obj_get_linfo, NULL)

    /* check arguments */
    HDassert(grp_oloc);

    /* Retrieve the "link info" structure */
    if((ret_value = H5O_msg_read(grp_oloc, H5O_LINFO_ID, linfo, dxpl_id))) {
        /* Check if we don't know how many links there are */
        if(ret_value->nlinks == HSIZET_MAX) {
            /* Check if we are using "dense" link storage */
            if(H5F_addr_defined(ret_value->fheap_addr)) {
                /* Retrieve # of records in "name" B-tree */
                /* (should be same # of records in all indices) */
                if(H5B2_get_nrec(grp_oloc->file, dxpl_id, H5G_BT2_NAME, ret_value->name_bt2_addr, &ret_value->nlinks) < 0)
                    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, NULL, "can't retrieve # of records in index")
            } /* end if */
            else {
                /* Retrieve # of links from object header */
                if(H5O_get_nlinks(grp_oloc, dxpl_id, &ret_value->nlinks) < 0)
                    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, NULL, "can't retrieve # of links for object")
            } /* end if */
        } /* end if */
    } /* end if */
    else
        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, NULL, "link info message not present")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_get_linfo() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_compact_to_dense_cb
 *
 * Purpose:	Callback routine for converting "compact" to "dense"
 *              link storage form.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Aug 30 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5G_obj_compact_to_dense_cb(const void *_mesg, unsigned UNUSED idx, void *_udata)
{
    const H5O_link_t *lnk = (const H5O_link_t *)_mesg;  /* Pointer to link */
    H5G_obj_oh_it_ud1_t *udata = (H5G_obj_oh_it_ud1_t *)_udata;     /* 'User data' passed in */
    herr_t ret_value = H5_ITER_CONT;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5G_obj_compact_to_dense_cb)

    /* check arguments */
    HDassert(lnk);
    HDassert(udata);

    /* Insert link into dense link storage */
    if(H5G_dense_insert(udata->f, udata->dxpl_id, udata->linfo, lnk) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, FAIL, "unable to insert link into dense storage")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_compact_to_dense_cb() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_stab_to_new_cb
 *
 * Purpose:	Callback routine for converting "symbol table" link storage to
 *              "new format" storage (either "compact" or "dense" storage).
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@hdfgroup.org
 *		Sept 16 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5G_obj_stab_to_new_cb(const H5O_link_t *lnk, void *_udata)
{
    H5G_obj_stab_it_ud1_t *udata = (H5G_obj_stab_it_ud1_t *)_udata;     /* 'User data' passed in */
    herr_t ret_value = H5_ITER_CONT;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5G_obj_stab_to_new_cb)

    /* check arguments */
    HDassert(lnk);
    HDassert(udata);

    /* Insert link into group */
    /* (Casting away const OK - QAK) */
    if(H5G_obj_insert(udata->grp_oloc, lnk->name, (H5O_link_t *)lnk, FALSE, udata->dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, H5_ITER_ERROR, "can't insert link into group")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_stab_to_new_cb() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_insert
 *
 * Purpose:	Insert a new symbol into the group described by GRP_OLOC.
 *		file F.	 The name of the new symbol is NAME and its symbol
 *		table entry is OBJ_LNK.  Increment the reference
 *              count for the object the link points if OBJ_LNK is a hard link
 *              and ADJ_LINK is true.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Sep  6 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_insert(const H5O_loc_t *grp_oloc, const char *name, H5O_link_t *obj_lnk,
    hbool_t adj_link, hid_t dxpl_id)
{
    H5O_linfo_t linfo;		/* Link info message */
    hbool_t use_old_format;     /* Whether to use 'old format' (symbol table) for insertions or not */
    hbool_t use_new_dense = FALSE;      /* Whether to use "dense" form of 'new format' group */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_insert, FAIL)

    /* check arguments */
    HDassert(grp_oloc && grp_oloc->file);
    HDassert(name && *name);
    HDassert(obj_lnk);

    /* Check if we have information about the number of objects in this group */
    /* (by attempting to get the link info message for this group) */
    if(H5G_obj_get_linfo(grp_oloc, &linfo, dxpl_id)) {
        H5O_ginfo_t ginfo;	/* Group info message */
        size_t link_msg_size;   /* Size of new link message in the file */

        /* Using the new format for groups */
        use_old_format = FALSE;

        /* Check for tracking creation order on this group's links */
        if(linfo.track_corder) {
            /* Set the creation order for the new link & indicate that it's valid */
            obj_lnk->corder = linfo.max_corder;
            obj_lnk->corder_valid = TRUE;

            /* Increment the max. creation order used in the group */
            linfo.max_corder++;
        } /* end if */

        /* Get the link's message size */
        if((link_msg_size = H5O_msg_raw_size(grp_oloc->file, H5O_LINK_ID, FALSE, obj_lnk)) == 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTGETSIZE, FAIL, "can't get link size")

        /* Get the group info */
        if(NULL == H5O_msg_read(grp_oloc, H5O_GINFO_ID, &ginfo, dxpl_id))
            HGOTO_ERROR(H5E_SYM, H5E_BADMESG, FAIL, "can't get group info")

        /* If there's still a small enough number of links, use the 'link' message */
        /* (If the encoded form of the link is too large to fit into an object
         *  header message, convert to using dense link storage instead of link messages)
         */
        if(H5F_addr_defined(linfo.fheap_addr))
            use_new_dense = TRUE;
        else if(linfo.nlinks < ginfo.max_compact && link_msg_size < H5O_MESG_MAX_SIZE)
            use_new_dense = FALSE;
        else {
            H5G_obj_oh_it_ud1_t	udata;          /* User data for iteration */
            H5O_mesg_operator_t op;             /* Message operator */

            /* The group doesn't currently have "dense" storage for links */
            if(H5G_dense_create(grp_oloc->file, dxpl_id, &linfo) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create 'dense' form of new format group")

            /* Set up user data for object header message iteration */
            udata.f = grp_oloc->file;
            udata.dxpl_id = dxpl_id;
            udata.linfo = &linfo;

            /* Iterate over the 'link' messages, inserting them into the dense link storage  */
            op.op_type = H5O_MESG_OP_APP;
            op.u.app_op = H5G_obj_compact_to_dense_cb;
            if(H5O_msg_iterate(grp_oloc, H5O_LINK_ID, &op, &udata, dxpl_id) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "error iterating over links")

            /* Remove all the 'link' messages */
            if(H5O_msg_remove(grp_oloc, H5O_LINK_ID, H5O_ALL, FALSE, dxpl_id) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTDELETE, FAIL, "unable to delete link messages")

            use_new_dense = TRUE;
        } /* end else */
    } /* end if */
    else {
        /* Clear error stack from not finding the link info message */
        H5E_clear_stack(NULL);

        /* Check for new-style link information */
        if(obj_lnk->cset != H5T_CSET_ASCII || obj_lnk->type > H5L_TYPE_BUILTIN_MAX) {
            H5O_linfo_t new_linfo = H5G_CRT_LINK_INFO_DEF;  /* Link information */
            H5O_ginfo_t new_ginfo = H5G_CRT_GROUP_INFO_DEF; /* Group information */
            H5G_obj_stab_it_ud1_t udata;        /* User data for iteration */

            /* Convert group to "new format" group, in order to hold the information */

            /* Insert link info message */
            if(H5O_msg_create(grp_oloc, H5O_LINFO_ID, 0, 0, &new_linfo, dxpl_id) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create message")

            /* Insert group info message */
            if(H5O_msg_create(grp_oloc, H5O_GINFO_ID, H5O_MSG_FLAG_CONSTANT, H5O_UPDATE_TIME, &new_ginfo, dxpl_id) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create message")

            /* Set up user data for iteration */
            udata.grp_oloc = grp_oloc;
            udata.dxpl_id = dxpl_id;

            /* Iterate through all links in "old format" group and insert them into new format */
            if(H5G_stab_iterate(grp_oloc, dxpl_id, H5_ITER_NATIVE, (hsize_t)0, NULL, H5G_obj_stab_to_new_cb, &udata) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTNEXT, FAIL, "error iterating over old format links")

            /* Remove the symbol table message from the group */
            if(H5O_msg_remove(grp_oloc, H5O_STAB_ID, 0, FALSE, dxpl_id) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTDELETE, FAIL, "unable to delete old format link storage")

            /* Recursively call this routine to insert the new link, since the
             *  group is in the "new format" now and the link info should be
             *  set up, etc.
             */
            if(H5G_obj_insert(grp_oloc, name, obj_lnk, adj_link, dxpl_id) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, FAIL, "unable to insert link into group")

            /* Done with insertion now */
            HGOTO_DONE(SUCCEED)
        } /* end if */
        else
            use_old_format = TRUE;
    } /* end if */

    /* Insert into symbol table or "dense" storage */
    if(use_old_format) {
        /* Insert into symbol table */
        if(H5G_stab_insert(grp_oloc, name, obj_lnk, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, FAIL, "unable to insert entry into symbol table")
    } /* end if */
    else {
        if(use_new_dense) {
            /* Insert into dense link storage */
            if(H5G_dense_insert(grp_oloc->file, dxpl_id, &linfo, obj_lnk) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, FAIL, "unable to insert link into dense storage")
        } /* end if */
        else {
            /* Insert with link message */
            if(H5G_compact_insert(grp_oloc, obj_lnk, dxpl_id) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, FAIL, "unable to insert link as link message")
        } /* end else */
    } /* end else */

    /* Increment the number of objects in this group */
    if(!use_old_format) {
        linfo.nlinks++;
        if(H5O_msg_write(grp_oloc, H5O_LINFO_ID, 0, H5O_UPDATE_TIME, &linfo, dxpl_id) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "can't update link info message")
    } /* end if */

    /* Increment link count on object, if requested and it's a hard link */
    if(adj_link && obj_lnk->type == H5L_TYPE_HARD) {
        H5O_loc_t obj_oloc;             /* Object location */
        H5O_loc_reset(&obj_oloc);

        /* Create temporary object location */
        obj_oloc.file = grp_oloc->file;
        obj_oloc.addr = obj_lnk->u.hard.addr;

        /* Increment reference count for object */
        if(H5O_link(&obj_oloc, 1, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_LINKCOUNT, FAIL, "unable to increment hard link count")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_insert() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_iterate
 *
 * Purpose:     Private function for H5Giterate.
 *              Iterates over objects in a group
 *
 * Return:	Success:        Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *	        Oct  3, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_iterate(const H5O_loc_t *grp_oloc,
    H5_index_t idx_type, H5_iter_order_t order, hsize_t skip, hsize_t *last_lnk,
    H5G_lib_iterate_t op, void *op_data, hid_t dxpl_id)
{
    H5O_linfo_t	linfo;		/* Link info message */
    herr_t ret_value;           /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_iterate, FAIL)

    /* Sanity check */
    HDassert(grp_oloc);
    HDassert(op);

    /* Attempt to get the link info for this group */
    if(H5G_obj_get_linfo(grp_oloc, &linfo, dxpl_id)) {
        /* Check for going out of bounds */
        if(skip > 0 && (size_t)skip >= linfo.nlinks)
            HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "index out of bound")

        /* Check for creation order tracking, if creation order index lookup requested */
        if(idx_type == H5_INDEX_CRT_ORDER) {
            /* Check if creation order is tracked */
            if(!linfo.track_corder)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "creation order not tracked for links in group")
        } /* end if */

        if(H5F_addr_defined(linfo.fheap_addr)) {
            /* Iterate over the links in the group, building a table of the link messages */
            if((ret_value = H5G_dense_iterate(grp_oloc->file, dxpl_id, &linfo, idx_type, order, skip, last_lnk, op, op_data)) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_BADITER, FAIL, "can't iterate over dense links")
        } /* end if */
        else {
            /* Get the object's name from the link messages */
            if((ret_value = H5G_compact_iterate(grp_oloc, dxpl_id, &linfo, idx_type, order, skip, last_lnk, op, op_data)) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_BADITER, FAIL, "can't iterate over compact links")
        } /* end else */
    } /* end if */
    else {
        /* Clear error stack from not finding the link info message */
        H5E_clear_stack(NULL);

        /* Can only perform name lookups on groups with symbol tables */
        if(idx_type != H5_INDEX_NAME)
            HGOTO_ERROR(H5E_SYM, H5E_BADVALUE, FAIL, "no creation order index to query")

        /* Iterate over symbol table */
        if((ret_value = H5G_stab_iterate(grp_oloc, dxpl_id, order, skip, last_lnk, op, op_data)) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_BADITER, FAIL, "can't iterate over symbol table")
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_iterate() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_info
 *
 * Purpose:	Retrieve information about a group
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@hdfgroup.org
 *		Nov 27 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_info(H5O_loc_t *oloc, H5G_info_t *grp_info, hid_t dxpl_id)
{
    H5O_linfo_t	linfo;		        /* Link info message */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_info, FAIL)

    /* Sanity check */
    HDassert(oloc);
    HDassert(grp_info);

    /* Attempt to get the link info for this group */
    if(H5G_obj_get_linfo(oloc, &linfo, dxpl_id)) {
        /* Retrieve the information about the links */
        grp_info->nlinks = linfo.nlinks;
        grp_info->max_corder = linfo.max_corder;

        /* Check if the group is using compact or dense storage for its links */
        if(H5F_addr_defined(linfo.fheap_addr))
            grp_info->storage_type = H5G_STORAGE_TYPE_DENSE;
        else
            grp_info->storage_type = H5G_STORAGE_TYPE_COMPACT;
    } /* end if */
    else {
        /* Clear error stack from not finding the link info message */
        H5E_clear_stack(NULL);

        /* Get the number of objects in this group by iterating over symbol table */
        if(H5G_stab_count(oloc, &grp_info->nlinks, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTCOUNT, FAIL, "can't count objects")

        /* Set the other information about the group */
        grp_info->storage_type = H5G_STORAGE_TYPE_SYMBOL_TABLE;
        grp_info->max_corder = 0;
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_info() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_get_name_by_idx
 *
 * Purpose:     Returns the name of link in a group by giving index.
 *
 * Return:	Success:        Non-negative, length of name
 *		Failure:	Negative
 *
 * Programmer:	Raymond Lu
 *	        Nov 20, 2002
 *
 *-------------------------------------------------------------------------
 */
ssize_t
H5G_obj_get_name_by_idx(H5O_loc_t *oloc, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t n, char* name, size_t size, hid_t dxpl_id)
{
    H5O_linfo_t	linfo;		/* Link info message */
    ssize_t ret_value;          /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_get_name_by_idx, FAIL)

    /* Sanity check */
    HDassert(oloc && oloc->file);

    /* Attempt to get the link info for this group */
    if(H5G_obj_get_linfo(oloc, &linfo, dxpl_id)) {
        /* Check for creation order tracking, if creation order index lookup requested */
        if(idx_type == H5_INDEX_CRT_ORDER) {
            /* Check if creation order is tracked */
            if(!linfo.track_corder)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "creation order not tracked for links in group")
        } /* end if */

        /* Check for dense link storage */
        if(H5F_addr_defined(linfo.fheap_addr)) {
            /* Get the object's name from the dense link storage */
            if((ret_value = H5G_dense_get_name_by_idx(oloc->file, dxpl_id, &linfo, idx_type, order, n, name, size)) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate name")
        } /* end if */
        else {
            /* Get the object's name from the link messages */
            if((ret_value = H5G_compact_get_name_by_idx(oloc, dxpl_id, &linfo, idx_type, order, n, name, size)) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate name")
        } /* end else */
    } /* end if */
    else {
        /* Clear error stack from not finding the link info message */
        H5E_clear_stack(NULL);

        /* Can only perform name lookups on groups with symbol tables */
        if(idx_type != H5_INDEX_NAME)
            HGOTO_ERROR(H5E_SYM, H5E_BADVALUE, FAIL, "no creation order index to query")

        /* Get the object's name from the symbol table */
        if((ret_value = H5G_stab_get_name_by_idx(oloc, order, n, name, size, dxpl_id)) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate name")
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_get_name_by_idx() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_remove_update_linfo
 *
 * Purpose:     Update the link info after removing a link from a group
 *
 * Return:	Success:        Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *	        Nov 14, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5G_obj_remove_update_linfo(H5O_loc_t *oloc, H5O_linfo_t *linfo, hid_t dxpl_id)
{
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5G_obj_remove_update_linfo)

    /* Sanity check */
    HDassert(oloc);
    HDassert(linfo);

    /* Decrement # of links in group */
    linfo->nlinks--;

    /* Reset the creation order min/max if there's no more links in group */
    if(linfo->nlinks == 0)
        linfo->max_corder = 0;

    /* Check for transitioning out of dense storage, if we are using it */
    if(H5F_addr_defined(linfo->fheap_addr)) {
        /* Check if there's no more links */
        if(linfo->nlinks == 0) {
            /* Delete the dense storage */
            if(H5G_dense_delete(oloc->file, dxpl_id, linfo, FALSE) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTDELETE, FAIL, "unable to delete dense link storage")
        } /* end if */
        /* Check for switching back to compact storage */
        else {
            H5O_ginfo_t ginfo;		/* Group info message            */

            /* Get the group info */
            if(NULL == H5O_msg_read(oloc, H5O_GINFO_ID, &ginfo, dxpl_id))
                HGOTO_ERROR(H5E_SYM, H5E_BADMESG, FAIL, "can't get group info")

            /* Check if we should switch from dense storage back to link messages */
            if(linfo->nlinks < ginfo.min_dense) {
                struct H5O_t *oh = NULL;      /* Pointer to group's object header */
                H5G_link_table_t ltable;        /* Table of links */
                hbool_t can_convert = TRUE;     /* Whether converting to link messages is possible */
                size_t u;                       /* Local index */

                /* Build the table of links for this group */
                if(H5G_dense_build_table(oloc->file, dxpl_id, linfo, H5_INDEX_NAME, H5_ITER_NATIVE, &ltable) < 0)
                    HGOTO_ERROR(H5E_SYM, H5E_CANTNEXT, FAIL, "error iterating over links")

                /* Get a pointer to the object header itself */
                if((oh = H5O_protect(oloc, dxpl_id)) == NULL)
                    HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to protect dataset object header")

                /* Inspect links in table for ones that can't be converted back
                 * into link message form (currently only links which can't fit
                 * into an object header message)
                 */
                for(u = 0; u < linfo->nlinks; u++)
                    if(H5O_msg_size_oh(oloc->file, oh, H5O_LINK_ID, &(ltable.lnks[u]), (size_t)0) >= H5O_MESG_MAX_SIZE) {
                        can_convert = FALSE;
                        break;
                    } /* end if */

                /* If ok, insert links as link messages */
                if(can_convert) {
                    /* Insert link messages into group */
                    for(u = 0; u < linfo->nlinks; u++)
                        if(H5O_msg_append(oloc->file, dxpl_id, oh, H5O_LINK_ID, 0, H5O_UPDATE_TIME, &(ltable.lnks[u])) < 0) {
                            /* Release object header */
                            if(H5O_unprotect(oloc, oh) < 0)
                                HDONE_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to unprotect dataset object header")

                            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't create message")
                        } /* end if */

                    /* Remove the dense storage */
                    if(H5G_dense_delete(oloc->file, dxpl_id, linfo, FALSE) < 0)
                        HGOTO_ERROR(H5E_SYM, H5E_CANTDELETE, FAIL, "unable to delete dense link storage")
                } /* end if */

                /* Release object header */
                if(H5O_unprotect(oloc, oh) < 0)
                    HDONE_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to unprotect dataset object header")

                /* Free link table information */
                if(H5G_link_release_table(&ltable) < 0)
                    HGOTO_ERROR(H5E_SYM, H5E_CANTFREE, FAIL, "unable to release link table")
            } /* end if */
        } /* end else */
    } /* end if */

    /* Update link info in the object header */
    if(H5O_msg_write(oloc, H5O_LINFO_ID, 0, H5O_UPDATE_TIME, linfo, dxpl_id) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "can't update link info message")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_remove_update_linfo() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_remove
 *
 * Purpose:     Remove a link from a group.
 *
 * Return:	Success:        Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *	        Sep 19, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_remove(H5O_loc_t *oloc, H5RS_str_t *grp_full_path_r, const char *name, hid_t dxpl_id)
{
    H5O_linfo_t	linfo;		/* Link info message            */
    hbool_t     use_old_format; /* Whether to use 'old format' (symbol table) for deletion or not */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_remove, FAIL)

    /* Sanity check */
    HDassert(oloc);
    HDassert(name && *name);

    /* Attempt to get the link info for this group */
    if(H5G_obj_get_linfo(oloc, &linfo, dxpl_id)) {
        /* Using the new format for groups */
        use_old_format = FALSE;

        /* Check for dense or compact storage */
        if(H5F_addr_defined(linfo.fheap_addr)) {
            /* Remove object from the dense link storage */
            if(H5G_dense_remove(oloc->file, dxpl_id, &linfo, grp_full_path_r, name) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't remove object")
        } /* end if */
        else {
            /* Remove object from the link messages */
            if(H5G_compact_remove(oloc, dxpl_id, grp_full_path_r, name) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't remove object")
        } /* end else */
    } /* end if */
    else {
        /* Clear error stack from not finding the link info message */
        H5E_clear_stack(NULL);

        /* Using the old format for groups */
        use_old_format = TRUE;

        /* Remove object from the symbol table */
        if(H5G_stab_remove(oloc, dxpl_id, grp_full_path_r, name) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't remove object")
    } /* end else */

    /* Update link info for a new-style group */
    if(!use_old_format)
        if(H5G_obj_remove_update_linfo(oloc, &linfo, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTUPDATE, FAIL, "unable to update link info")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_remove() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_remove_by_idx
 *
 * Purpose:     Remove a link from a group, according to the order within an index.
 *
 * Return:	Success:        Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *	        Nov 14, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_remove_by_idx(H5O_loc_t *grp_oloc, H5RS_str_t *grp_full_path_r,
    H5_index_t idx_type, H5_iter_order_t order, hsize_t n, hid_t dxpl_id)
{
    H5O_linfo_t	linfo;		/* Link info message            */
    hbool_t     use_old_format; /* Whether to use 'old format' (symbol table) for deletion or not */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_remove_by_idx, FAIL)

    /* Sanity check */
    HDassert(grp_oloc && grp_oloc->file);

    /* Attempt to get the link info for this group */
    if(H5G_obj_get_linfo(grp_oloc, &linfo, dxpl_id)) {
        /* Check for creation order tracking, if creation order index lookup requested */
        if(idx_type == H5_INDEX_CRT_ORDER) {
            /* Check if creation order is tracked */
            if(!linfo.track_corder)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "creation order not tracked for links in group")
        } /* end if */

        /* Using the new format for groups */
        use_old_format = FALSE;

        /* Check for dense or compact storage */
        if(H5F_addr_defined(linfo.fheap_addr)) {
            /* Remove object from the dense link storage */
            if(H5G_dense_remove_by_idx(grp_oloc->file, dxpl_id, &linfo, grp_full_path_r, idx_type, order, n) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't remove object")
        } /* end if */
        else {
            /* Remove object from compact link storage */
            if(H5G_compact_remove_by_idx(grp_oloc, dxpl_id, &linfo, grp_full_path_r, idx_type, order, n) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't remove object")
        } /* end else */
    } /* end if */
    else {
        /* Clear error stack from not finding the link info message */
        H5E_clear_stack(NULL);

        /* Can only perform name lookups on groups with symbol tables */
        if(idx_type != H5_INDEX_NAME)
            HGOTO_ERROR(H5E_SYM, H5E_BADVALUE, FAIL, "no creation order index to query")

        /* Using the old format for groups */
        use_old_format = TRUE;

        /* Remove object from the symbol table */
        if(H5G_stab_remove_by_idx(grp_oloc, dxpl_id, grp_full_path_r, order, n) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't remove object")
    } /* end else */

    /* Update link info for a new-style group */
    if(!use_old_format) {
        if(H5G_obj_remove_update_linfo(grp_oloc, &linfo, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTUPDATE, FAIL, "unable to update link info")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_remove() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_lookup
 *
 * Purpose:	Look up a link in a group, using the name as the key.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Sep 26 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_lookup(H5O_loc_t *grp_oloc, const char *name, H5O_link_t *lnk,
    hid_t dxpl_id)
{
    H5O_linfo_t linfo;		        /* Link info message */
    herr_t     ret_value = SUCCEED;     /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_lookup, FAIL)

    /* check arguments */
    HDassert(grp_oloc && grp_oloc->file);
    HDassert(name && *name);

    /* Attempt to get the link info message for this group */
    if(H5G_obj_get_linfo(grp_oloc, &linfo, dxpl_id)) {
        /* Check for dense link storage */
        if(H5F_addr_defined(linfo.fheap_addr)) {
            /* Get the object's info from the dense link storage */
            if(H5G_dense_lookup(grp_oloc->file, dxpl_id, &linfo, name, lnk) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate object")
        } /* end if */
        else {
            /* Get the object's info from the link messages */
            if(H5G_compact_lookup(grp_oloc, name, lnk, dxpl_id) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate object")
        } /* end else */
    } /* end if */
    else {
        /* Clear error stack from not finding the link info message */
        H5E_clear_stack(NULL);

        /* Get the object's info from the symbol table */
        if(H5G_stab_lookup(grp_oloc, name, lnk, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate object")
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_lookup() */


/*-------------------------------------------------------------------------
 * Function:	H5G_obj_lookup_by_idx
 *
 * Purpose:	Look up link info in a group, according to an order within an
 *              index.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@hdfgroup.org
 *		Nov  6 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_obj_lookup_by_idx(H5O_loc_t *grp_oloc, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t n, H5O_link_t *lnk, hid_t dxpl_id)
{
    H5O_linfo_t linfo;		        /* Link info message */
    herr_t     ret_value = SUCCEED;     /* Return value */

    FUNC_ENTER_NOAPI(H5G_obj_lookup_by_idx, FAIL)

    /* check arguments */
    HDassert(grp_oloc && grp_oloc->file);

    /* Attempt to get the link info message for this group */
    if(H5G_obj_get_linfo(grp_oloc, &linfo, dxpl_id)) {
        /* Check for creation order tracking, if creation order index lookup requested */
        if(idx_type == H5_INDEX_CRT_ORDER) {
            /* Check if creation order is tracked */
            if(!linfo.track_corder)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "creation order not tracked for links in group")
        } /* end if */

        /* Check for dense link storage */
        if(H5F_addr_defined(linfo.fheap_addr)) {
            /* Get the link from the dense storage */
            if(H5G_dense_lookup_by_idx(grp_oloc->file, dxpl_id, &linfo, idx_type, order, n, lnk) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate object")
        } /* end if */
        else {
            /* Get the link from the link messages */
            if(H5G_compact_lookup_by_idx(grp_oloc, dxpl_id, &linfo, idx_type, order, n, lnk) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate object")
        } /* end else */
    } /* end if */
    else {
        /* Clear error stack from not finding the link info message */
        H5E_clear_stack(NULL);

        /* Can only perform name lookups on groups with symbol tables */
        if(idx_type != H5_INDEX_NAME)
            HGOTO_ERROR(H5E_SYM, H5E_BADVALUE, FAIL, "no creation order index to query")

        /* Get the object's info from the symbol table */
        if(H5G_stab_lookup_by_idx(grp_oloc, order, n, lnk, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "can't locate object")
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_obj_lookup_by_idx() */