summaryrefslogtreecommitdiffstats
path: root/src/H5Z.c
blob: 51ef9aa5955b99576cfd7ae1d9a8b582994020de (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
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * 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 COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include "H5Zmodule.h" /* This source code file is part of the H5Z module */

#include "H5private.h"   /* Generic Functions   */
#include "H5CXprivate.h" /* API Contexts        */
#include "H5Dprivate.h"  /* Dataset functions   */
#include "H5Eprivate.h"  /* Error handling      */
#include "H5Fprivate.h"  /* File                */
#include "H5Iprivate.h"  /* IDs                 */
#include "H5MMprivate.h" /* Memory management   */
#include "H5Oprivate.h"  /* Object headers      */
#include "H5Pprivate.h"  /* Property lists      */
#include "H5PLprivate.h" /* Plugins             */
#include "H5Sprivate.h"  /* Dataspace functions */
#include "H5Zpkg.h"      /* Data filters        */

#ifdef H5_HAVE_SZLIB_H
#include "szlib.h"
#endif

/* Local typedefs */
#ifdef H5Z_DEBUG
typedef struct H5Z_stats_t {
    struct {
        hsize_t       total;  /* total number of bytes processed */
        hsize_t       errors; /* bytes of total attributable to errors */
        H5_timevals_t times;  /* execution time including errors */
    } stats[2];               /* 0 = output, 1 = input */
} H5Z_stats_t;
#endif /* H5Z_DEBUG */

typedef struct H5Z_object_t {
    H5Z_filter_t filter_id; /* ID of the filter we're looking for */
    htri_t       found;     /* Whether we find an object using the filter */
#ifdef H5_HAVE_PARALLEL
    hbool_t
        sanity_checked; /* Whether the sanity check for collectively calling H5Zunregister has been done */
#endif                  /* H5_HAVE_PARALLEL */
} H5Z_object_t;

/* Enumerated type for dataset creation prelude callbacks */
typedef enum {
    H5Z_PRELUDE_CAN_APPLY, /* Call "can apply" callback */
    H5Z_PRELUDE_SET_LOCAL  /* Call "set local" callback */
} H5Z_prelude_type_t;

/* Package initialization variable */
hbool_t H5_PKG_INIT_VAR = FALSE;

/* Local variables */
static size_t        H5Z_table_alloc_g = 0;
static size_t        H5Z_table_used_g  = 0;
static H5Z_class2_t *H5Z_table_g       = NULL;
#ifdef H5Z_DEBUG
static H5Z_stats_t *H5Z_stat_table_g = NULL;
#endif /* H5Z_DEBUG */

/* Local functions */
static int H5Z__find_idx(H5Z_filter_t id);
static int H5Z__check_unregister_dset_cb(void *obj_ptr, hid_t obj_id, void *key);
static int H5Z__check_unregister_group_cb(void *obj_ptr, hid_t obj_id, void *key);
static int H5Z__flush_file_cb(void *obj_ptr, hid_t obj_id, void *key);

/*-------------------------------------------------------------------------
 * Function: H5Z__init_package
 *
 * Purpose:  Initializes the data filter layer.
 *
 * Return:   Non-negative on success/Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Z__init_package(void)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Internal filters */
    if (H5Z_register(H5Z_SHUFFLE) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register shuffle filter")
    if (H5Z_register(H5Z_FLETCHER32) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register fletcher32 filter")
    if (H5Z_register(H5Z_NBIT) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register nbit filter")
    if (H5Z_register(H5Z_SCALEOFFSET) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register scaleoffset filter")

        /* External filters */
#ifdef H5_HAVE_FILTER_DEFLATE
    if (H5Z_register(H5Z_DEFLATE) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register deflate filter")
#endif /* H5_HAVE_FILTER_DEFLATE */
#ifdef H5_HAVE_FILTER_SZIP
    {
        int encoder_enabled = SZ_encoder_enabled();
        if (encoder_enabled < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "check for szip encoder failed")

        H5Z_SZIP->encoder_present = (unsigned)encoder_enabled;
        if (H5Z_register(H5Z_SZIP) < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register szip filter")
    }
#endif /* H5_HAVE_FILTER_SZIP */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__init_package() */

/*-------------------------------------------------------------------------
 * Function: H5Z_term_package
 *
 * Purpose:  Terminate the H5Z layer.
 *
 * Return:   void
 *-------------------------------------------------------------------------
 */
int
H5Z_term_package(void)
{
    int n = 0;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    if (H5_PKG_INIT_VAR) {
#ifdef H5Z_DEBUG
        char   comment[16], bandwidth[32];
        int    dir, nprint = 0;
        size_t i;

        if (H5DEBUG(Z)) {
            for (i = 0; i < H5Z_table_used_g; i++) {
                for (dir = 0; dir < 2; dir++) {
                    struct {
                        char *user;
                        char *system;
                        char *elapsed;
                    } timestrs = {H5_timer_get_time_string(H5Z_stat_table_g[i].stats[dir].times.user),
                                  H5_timer_get_time_string(H5Z_stat_table_g[i].stats[dir].times.system),
                                  H5_timer_get_time_string(H5Z_stat_table_g[i].stats[dir].times.elapsed)};
                    if (0 == H5Z_stat_table_g[i].stats[dir].total)
                        goto next;

                    if (0 == nprint++) {
                        /* Print column headers */
                        HDfprintf(H5DEBUG(Z), "H5Z: filter statistics "
                                              "accumulated over life of library:\n");
                        HDfprintf(H5DEBUG(Z), "   %-16s %10s %10s %8s %8s %8s %10s\n", "Filter", "Total",
                                  "Errors", "User", "System", "Elapsed", "Bandwidth");
                        HDfprintf(H5DEBUG(Z), "   %-16s %10s %10s %8s %8s %8s %10s\n", "------", "-----",
                                  "------", "----", "------", "-------", "---------");
                    } /* end if */

                    /* Truncate the comment to fit in the field */
                    HDstrncpy(comment, H5Z_table_g[i].name, sizeof comment);
                    comment[sizeof(comment) - 1] = '\0';

                    /*
                     * Format bandwidth to have four significant digits and
                     * units of `B/s', `kB/s', `MB/s', `GB/s', or `TB/s' or
                     * the word `Inf' if the elapsed time is zero.
                     */
                    H5_bandwidth(bandwidth, (double)(H5Z_stat_table_g[i].stats[dir].total),
                                 H5Z_stat_table_g[i].stats[dir].times.elapsed);

                    /* Print the statistics */
                    HDfprintf(H5DEBUG(Z), "   %s%-15s %10" PRIdHSIZE " %10" PRIdHSIZE " %8s %8s %8s %10s\n",
                              (dir ? "<" : ">"), comment, H5Z_stat_table_g[i].stats[dir].total,
                              H5Z_stat_table_g[i].stats[dir].errors, timestrs.user, timestrs.system,
                              timestrs.elapsed, bandwidth);
next:
                    HDfree(timestrs.user);
                    HDfree(timestrs.system);
                    HDfree(timestrs.elapsed);
                } /* end for */
            }     /* end for */
        }         /* end if */
#endif            /* H5Z_DEBUG */

        /* Free the table of filters */
        if (H5Z_table_g) {
            H5Z_table_g = (H5Z_class2_t *)H5MM_xfree(H5Z_table_g);

#ifdef H5Z_DEBUG
            H5Z_stat_table_g = (H5Z_stats_t *)H5MM_xfree(H5Z_stat_table_g);
#endif /* H5Z_DEBUG */
            H5Z_table_used_g = H5Z_table_alloc_g = 0;

            n++;
        } /* end if */

        /* Mark interface as closed */
        if (0 == n)
            H5_PKG_INIT_VAR = FALSE;
    } /* end if */

    FUNC_LEAVE_NOAPI(n)
} /* end H5Z_term_package() */

/*-------------------------------------------------------------------------
 * Function: H5Zregister
 *
 * Purpose:  This function registers new filter.
 *
 * Return:   Non-negative on success/Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Zregister(const void *cls)
{
    const H5Z_class2_t *cls_real  = (const H5Z_class2_t *)cls; /* "Real" class pointer */
    herr_t              ret_value = SUCCEED;                   /* Return value */
#ifndef H5_NO_DEPRECATED_SYMBOLS
    H5Z_class2_t cls_new; /* Translated class struct */
#endif

    FUNC_ENTER_API(FAIL)
    H5TRACE1("e", "*x", cls);

    /* Check args */
    if (cls_real == NULL)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid filter class")

    /* Check H5Z_class_t version number; this is where a function to convert
     * from an outdated version should be called.
     *
     * If the version number is invalid, we assume that the target of cls is the
     * old style "H5Z_class1_t" structure, which did not contain a version
     * field.  In this structure, the first field is the id.  Since both version
     * and id are integers they will have the same value, and since id must be
     * at least 256, there should be no overlap and the version of the struct
     * can be determined by the value of the first field.
     */
    if (cls_real->version != H5Z_CLASS_T_VERS) {
#ifndef H5_NO_DEPRECATED_SYMBOLS
        /* Assume it is an old "H5Z_class1_t" instead */
        const H5Z_class1_t *cls_old = (const H5Z_class1_t *)cls;

        /* Translate to new H5Z_class2_t */
        cls_new.version         = H5Z_CLASS_T_VERS;
        cls_new.id              = cls_old->id;
        cls_new.encoder_present = 1;
        cls_new.decoder_present = 1;
        cls_new.name            = cls_old->name;
        cls_new.can_apply       = cls_old->can_apply;
        cls_new.set_local       = cls_old->set_local;
        cls_new.filter          = cls_old->filter;

        /* Set cls_real to point to the translated structure */
        cls_real = &cls_new;

#else  /* H5_NO_DEPRECATED_SYMBOLS */
        /* Deprecated symbols not allowed, throw an error */
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid H5Z_class_t version number");
#endif /* H5_NO_DEPRECATED_SYMBOLS */
    }  /* end if */

    if (cls_real->id < 0 || cls_real->id > H5Z_FILTER_MAX)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid filter identification number")
    if (cls_real->id < H5Z_FILTER_RESERVED)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "unable to modify predefined filters")
    if (cls_real->filter == NULL)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no filter function specified")

    /* Do it */
    if (H5Z_register(cls_real) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register filter")

done:
    FUNC_LEAVE_API(ret_value)
}

/*-------------------------------------------------------------------------
 * Function: H5Z_register
 *
 * Purpose:  Same as the public version except this one allows filters
 *           to be set for predefined method numbers < H5Z_FILTER_RESERVED
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_register(const H5Z_class2_t *cls)
{
    size_t i;
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(cls);
    HDassert(cls->id >= 0 && cls->id <= H5Z_FILTER_MAX);

    /* Is the filter already registered? */
    for (i = 0; i < H5Z_table_used_g; i++)
        if (H5Z_table_g[i].id == cls->id)
            break;

    /* Filter not already registered */
    if (i >= H5Z_table_used_g) {
        if (H5Z_table_used_g >= H5Z_table_alloc_g) {
            size_t        n     = MAX(H5Z_MAX_NFILTERS, 2 * H5Z_table_alloc_g);
            H5Z_class2_t *table = (H5Z_class2_t *)H5MM_realloc(H5Z_table_g, n * sizeof(H5Z_class2_t));
#ifdef H5Z_DEBUG
            H5Z_stats_t *stat_table = (H5Z_stats_t *)H5MM_realloc(H5Z_stat_table_g, n * sizeof(H5Z_stats_t));
#endif /* H5Z_DEBUG */
            if (!table)
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "unable to extend filter table")
            H5Z_table_g = table;
#ifdef H5Z_DEBUG
            if (!stat_table)
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "unable to extend filter statistics table")
            H5Z_stat_table_g = stat_table;
#endif /* H5Z_DEBUG */
            H5Z_table_alloc_g = n;
        } /* end if */

        /* Initialize */
        i = H5Z_table_used_g++;
        H5MM_memcpy(H5Z_table_g + i, cls, sizeof(H5Z_class2_t));
#ifdef H5Z_DEBUG
        HDmemset(H5Z_stat_table_g + i, 0, sizeof(H5Z_stats_t));
#endif /* H5Z_DEBUG */
    }  /* end if */
    /* Filter already registered */
    else {
        /* Replace old contents */
        H5MM_memcpy(H5Z_table_g + i, cls, sizeof(H5Z_class2_t));
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
}

/*-------------------------------------------------------------------------
 * Function:    H5Zunregister
 *
 * Purpose:     This function unregisters a filter.
 *
 * Return:      Non-negative on success
 *              Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Zunregister(H5Z_filter_t id)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("e", "Zf", id);

    /* Check args */
    if (id < 0 || id > H5Z_FILTER_MAX)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid filter identification number")
    if (id < H5Z_FILTER_RESERVED)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "unable to modify predefined filters")

    /* Do it */
    if (H5Z__unregister(id) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to unregister filter")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Zunregister() */

/*-------------------------------------------------------------------------
 * Function:    H5Z__unregister
 *
 * Purpose:     Same as the public version except this one allows filters
 *               to be unset for predefined method numbers <H5Z_FILTER_RESERVED
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Z__unregister(H5Z_filter_t filter_id)
{
    size_t       filter_index;        /* Local index variable for filter */
    H5Z_object_t object;              /* Object to pass to callbacks */
    herr_t       ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    HDassert(filter_id >= 0 && filter_id <= H5Z_FILTER_MAX);

    /* Is the filter already registered? */
    for (filter_index = 0; filter_index < H5Z_table_used_g; filter_index++)
        if (H5Z_table_g[filter_index].id == filter_id)
            break;

    /* Fail if filter not found */
    if (filter_index >= H5Z_table_used_g)
        HGOTO_ERROR(H5E_PLINE, H5E_NOTFOUND, FAIL, "filter is not registered")

    /* Initialize the structure object for iteration */
    object.filter_id = filter_id;
    object.found     = FALSE;
#ifdef H5_HAVE_PARALLEL
    object.sanity_checked = FALSE;
#endif /* H5_HAVE_PARALLEL */

    /* Iterate through all opened datasets, returns a failure if any of them uses the filter */
    if (H5I_iterate(H5I_DATASET, H5Z__check_unregister_dset_cb, &object, FALSE) < 0)
        HGOTO_ERROR(H5E_FILE, H5E_BADITER, FAIL, "iteration failed")

    if (object.found)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTRELEASE, FAIL,
                    "can't unregister filter because a dataset is still using it")

    /* Iterate through all opened groups, returns a failure if any of them uses the filter */
    if (H5I_iterate(H5I_GROUP, H5Z__check_unregister_group_cb, &object, FALSE) < 0)
        HGOTO_ERROR(H5E_FILE, H5E_BADITER, FAIL, "iteration failed")

    if (object.found)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTRELEASE, FAIL,
                    "can't unregister filter because a group is still using it")

    /* Iterate through all opened files and flush them */
    if (H5I_iterate(H5I_FILE, H5Z__flush_file_cb, &object, FALSE) < 0)
        HGOTO_ERROR(H5E_FILE, H5E_BADITER, FAIL, "iteration failed")

    /* Remove filter from table */
    /* Don't worry about shrinking table size (for now) */
    HDmemmove(&H5Z_table_g[filter_index], &H5Z_table_g[filter_index + 1],
              sizeof(H5Z_class2_t) * ((H5Z_table_used_g - 1) - filter_index));
#ifdef H5Z_DEBUG
    HDmemmove(&H5Z_stat_table_g[filter_index], &H5Z_stat_table_g[filter_index + 1],
              sizeof(H5Z_stats_t) * ((H5Z_table_used_g - 1) - filter_index));
#endif /* H5Z_DEBUG */
    H5Z_table_used_g--;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__unregister() */

/*-------------------------------------------------------------------------
 * Function:    H5Z__check_unregister
 *
 * Purpose:     Check if an object uses the filter to be unregistered.
 *
 * Return:      TRUE if the object uses the filter
 *              FALSE if not
 *              NEGATIVE on error
 *
 *-------------------------------------------------------------------------
 */
static htri_t
H5Z__check_unregister(hid_t ocpl_id, H5Z_filter_t filter_id)
{
    H5P_genplist_t *plist;             /* Property list */
    htri_t          ret_value = FALSE; /* Return value */

    FUNC_ENTER_STATIC

    /* Get the plist structure of object creation */
    if (NULL == (plist = H5P_object_verify(ocpl_id, H5P_OBJECT_CREATE)))
        HGOTO_ERROR(H5E_PLINE, H5E_BADATOM, FAIL, "can't find object for ID")

    /* Check if the object creation property list uses the filter */
    if ((ret_value = H5P_filter_in_pline(plist, filter_id)) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't check filter in pipeline")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__check_unregister() */

/*-------------------------------------------------------------------------
 * Function:    H5Z__check_unregister_group_cb
 *
 * Purpose:     The callback function for H5Z__unregister. It iterates
 *              through all opened objects.  If the object is a dataset
 *              or a group and it uses the filter to be unregistered, the
 *              function returns TRUE.
 *
 * Return:      TRUE if the object uses the filter
 *              FALSE if not
 *              NEGATIVE on error
 *
 *-------------------------------------------------------------------------
 */
static int
H5Z__check_unregister_group_cb(void *obj_ptr, hid_t H5_ATTR_UNUSED obj_id, void *key)
{
    hid_t         ocpl_id         = -1;
    H5Z_object_t *object          = (H5Z_object_t *)key;
    htri_t        filter_in_pline = FALSE;
    int           ret_value       = FALSE; /* Return value */

    FUNC_ENTER_STATIC

    HDassert(obj_ptr);

    /* Get the group creation property */
    if ((ocpl_id = H5G_get_create_plist((H5G_t *)obj_ptr)) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't get group creation property list")

    /* Check if the filter is in the group creation property list */
    if ((filter_in_pline = H5Z__check_unregister(ocpl_id, object->filter_id)) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't check filter in pipeline")

    /* H5I_iterate expects TRUE to stop the loop over objects. Stop the loop and
     * let H5Z__unregister return failure.
     */
    if (filter_in_pline) {
        object->found = TRUE;
        ret_value     = TRUE;
    }

done:
    if (ocpl_id > 0)
        if (H5I_dec_app_ref(ocpl_id) < 0)
            HDONE_ERROR(H5E_PLINE, H5E_CANTDEC, FAIL, "can't release plist")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__check_unregister_group_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5Z__check_unregister_dset_cb
 *
 * Purpose:     The callback function for H5Z__unregister. It iterates
 *              through all opened objects.  If the object is a dataset
 *              or a group and it uses the filter to be unregistered, the
 *              function returns TRUE.
 *
 * Return:      TRUE if the object uses the filter
 *              FALSE if not
 *              NEGATIVE on error
 *
 *-------------------------------------------------------------------------
 */
static int
H5Z__check_unregister_dset_cb(void *obj_ptr, hid_t H5_ATTR_UNUSED obj_id, void *key)
{
    hid_t         ocpl_id         = -1;
    H5Z_object_t *object          = (H5Z_object_t *)key;
    htri_t        filter_in_pline = FALSE;
    int           ret_value       = FALSE; /* Return value */

    FUNC_ENTER_STATIC

    HDassert(obj_ptr);

    /* Get the dataset creation property */
    if ((ocpl_id = H5D_get_create_plist((H5D_t *)obj_ptr)) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't get dataset creation property list")

    /* Check if the filter is in the dataset creation property list */
    if ((filter_in_pline = H5Z__check_unregister(ocpl_id, object->filter_id)) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't check filter in pipeline")

    /* H5I_iterate expects TRUE to stop the loop over objects. Stop the loop and
     * let H5Z__unregister return failure.
     */
    if (filter_in_pline) {
        object->found = TRUE;
        ret_value     = TRUE;
    }

done:
    if (ocpl_id > 0)
        if (H5I_dec_app_ref(ocpl_id) < 0)
            HDONE_ERROR(H5E_PLINE, H5E_CANTDEC, FAIL, "can't release plist")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__check_unregister_dset_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5Z__flush_file_cb
 *
 * Purpose:     The callback function for H5Z__unregister. It iterates
 *              through all opened files and flush them.
 *
 * Return:      NON-NEGATIVE if finishes flushing and moves on
 *              NEGATIVE if there is an error
 *-------------------------------------------------------------------------
 */
static int
H5Z__flush_file_cb(void *obj_ptr, hid_t H5_ATTR_UNUSED obj_id, void *key H5_ATTR_PARALLEL_USED)
{
    H5F_t *f = (H5F_t *)obj_ptr; /* File object for operations */
#ifdef H5_HAVE_PARALLEL
    H5Z_object_t *object = (H5Z_object_t *)key;
#endif                     /* H5_HAVE_PARALLEL */
    int ret_value = FALSE; /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(obj_ptr);
    HDassert(key);

    /* Do a global flush if the file is opened for write */
    if (H5F_ACC_RDWR & H5F_INTENT(f)) {

#ifdef H5_HAVE_PARALLEL
        /* Check if MPIO driver is used */
        if (H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI)) {
            /* Sanity check for collectively calling H5Zunregister, if requested */
            /* (Sanity check assumes that a barrier on one file's comm
             *  is sufficient (i.e. that there aren't different comms for
             *  different files).  -QAK, 2018/02/14)
             */
            if (H5_coll_api_sanity_check_g && !object->sanity_checked) {
                MPI_Comm mpi_comm; /* File's communicator */

                /* Retrieve the file communicator */
                if (MPI_COMM_NULL == (mpi_comm = H5F_mpi_get_comm(f)))
                    HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't get MPI communicator")

                /* Issue the barrier */
                if (mpi_comm != MPI_COMM_NULL)
                    MPI_Barrier(mpi_comm);

                /* Set the "sanity checked" flag */
                object->sanity_checked = TRUE;
            } /* end if */
        }     /* end if */
#endif        /* H5_HAVE_PARALLEL */

        /* Call the flush routine for mounted file hierarchies */
        if (H5F_flush_mounts((H5F_t *)obj_ptr) < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTFLUSH, FAIL, "unable to flush file hierarchy")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__flush_file_cb() */

/*-------------------------------------------------------------------------
 * Function: H5Zfilter_avail
 *
 * Purpose:  Check if a filter is available
 *
 * Return:   Non-negative (TRUE/FALSE) on success/Negative on failure
 *-------------------------------------------------------------------------
 */
htri_t
H5Zfilter_avail(H5Z_filter_t id)
{
    htri_t ret_value = FALSE; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("t", "Zf", id);

    /* Check args */
    if (id < 0 || id > H5Z_FILTER_MAX)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid filter identification number")

    if ((ret_value = H5Z_filter_avail(id)) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_NOTFOUND, FAIL, "unable to check the availability of the filter")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Zfilter_avail() */

/*-------------------------------------------------------------------------
 * Function: H5Z_filter_avail
 *
 * Purpose:  Private function to check if a filter is available
 *
 * Return:   Non-negative (TRUE/FALSE) on success/Negative on failure
 *-------------------------------------------------------------------------
 */
htri_t
H5Z_filter_avail(H5Z_filter_t id)
{
    H5PL_key_t          key;               /* Key for finding a plugin     */
    const H5Z_class2_t *filter_info;       /* Filter information           */
    size_t              i;                 /* Local index variable         */
    htri_t              ret_value = FALSE; /* Return value                 */

    FUNC_ENTER_NOAPI(FAIL)

    /* Is the filter already registered? */
    for (i = 0; i < H5Z_table_used_g; i++)
        if (H5Z_table_g[i].id == id)
            HGOTO_DONE(TRUE)

    key.id = (int)id;
    if (NULL != (filter_info = (const H5Z_class2_t *)H5PL_load(H5PL_TYPE_FILTER, key))) {
        if (H5Z_register(filter_info) < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register loaded filter")
        HGOTO_DONE(TRUE)
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_filter_avail() */

/*-------------------------------------------------------------------------
 * Function: H5Z__prelude_callback
 *
 * Purpose:  Makes a dataset creation "prelude" callback for the "can_apply"
 *           or "set_local" routines.
 *
 * Return:   Non-negative on success/Negative on failure
 *
 * Notes:    The chunk dimensions are used to create a dataspace, instead
 *           of passing in the dataset's dataspace, since the chunk
 *           dimensions are what the I/O filter will actually see
 *-------------------------------------------------------------------------
 */
static herr_t
H5Z__prelude_callback(const H5O_pline_t *pline, hid_t dcpl_id, hid_t type_id, hid_t space_id,
                      H5Z_prelude_type_t prelude_type)
{
    H5Z_class2_t *fclass;           /* Individual filter information */
    size_t        u;                /* Local index variable */
    htri_t        ret_value = TRUE; /* Return value */

    FUNC_ENTER_STATIC

    HDassert(pline->nused > 0);

    /* Iterate over filters */
    for (u = 0; u < pline->nused; u++) {
        /* Get filter information */
        if (NULL == (fclass = H5Z_find(pline->filter[u].id))) {
            /* Ignore errors from optional filters */
            if (pline->filter[u].flags & H5Z_FLAG_OPTIONAL)
                H5E_clear_stack(NULL);
            else
                HGOTO_ERROR(H5E_PLINE, H5E_NOTFOUND, FAIL, "required filter was not located")
        } /* end if */
        else {
            /* Make correct callback */
            switch (prelude_type) {
                case H5Z_PRELUDE_CAN_APPLY:
                    /* Check if filter is configured to be able to encode */
                    if (!fclass->encoder_present)
                        HGOTO_ERROR(H5E_PLINE, H5E_NOENCODER, FAIL,
                                    "Filter present but encoding is disabled.");

                    /* Check if there is a "can apply" callback */
                    if (fclass->can_apply) {
                        /* Make callback to filter's "can apply" function */
                        htri_t status = (fclass->can_apply)(dcpl_id, type_id, space_id);

                        /* Indicate error during filter callback */
                        if (status < 0)
                            HGOTO_ERROR(H5E_PLINE, H5E_CANAPPLY, FAIL, "error during user callback")

                        /* Indicate filter can't apply to this combination of parameters.
                         * If the filter is NOT optional, returns failure. */
                        if (status == FALSE && !(pline->filter[u].flags & H5Z_FLAG_OPTIONAL))
                            HGOTO_ERROR(H5E_PLINE, H5E_CANAPPLY, FAIL, "filter parameters not appropriate")
                    } /* end if */
                    break;

                case H5Z_PRELUDE_SET_LOCAL:
                    /* Check if there is a "set local" callback */
                    if (fclass->set_local) {
                        /* Make callback to filter's "set local" function */
                        if ((fclass->set_local)(dcpl_id, type_id, space_id) < 0)
                            /* Indicate error during filter callback */
                            HGOTO_ERROR(H5E_PLINE, H5E_SETLOCAL, FAIL, "error during user callback")
                    } /* end if */
                    break;

                default:
                    HDassert("invalid prelude type" && 0);
            } /* end switch */
        }     /* end else */
    }         /* end for */

done:

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__prelude_callback() */

/*-------------------------------------------------------------------------
 * Function: H5Z__prepare_prelude_callback_dcpl
 *
 * Purpose:  Prepares to make a dataset creation "prelude" callback
 *           for the "can_apply" or "set_local" routines.
 *
 * Return:   Non-negative on success/Negative on failure
 *
 * Notes:    The chunk dimensions are used to create a dataspace, instead
 *           of passing in the dataset's dataspace, since the chunk
 *           dimensions are what the I/O filter will actually see
 *-------------------------------------------------------------------------
 */
static herr_t
H5Z__prepare_prelude_callback_dcpl(hid_t dcpl_id, hid_t type_id, H5Z_prelude_type_t prelude_type)
{
    hid_t         space_id    = -1;      /* ID for dataspace describing chunk */
    H5O_layout_t *dcpl_layout = NULL;    /* Dataset's layout information */
    herr_t        ret_value   = SUCCEED; /* Return value */

    FUNC_ENTER_STATIC

    HDassert(H5I_GENPROP_LST == H5I_get_type(dcpl_id));
    HDassert(H5I_DATATYPE == H5I_get_type(type_id));

    /* Check if the property list is non-default */
    if (dcpl_id != H5P_DATASET_CREATE_DEFAULT) {
        H5P_genplist_t *dc_plist; /* Dataset creation property list object */

        /* Get memory for the layout */
        if (NULL == (dcpl_layout = (H5O_layout_t *)H5MM_calloc(sizeof(H5O_layout_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "unable to allocate dcpl layout buffer")

        /* Get dataset creation property list object */
        if (NULL == (dc_plist = (H5P_genplist_t *)H5I_object(dcpl_id)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't get dataset creation property list")

        /* Peek at the layout information */
        if (H5P_peek(dc_plist, H5D_CRT_LAYOUT_NAME, dcpl_layout) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't retrieve layout")

        /* Check if the dataset is chunked */
        if (H5D_CHUNKED == dcpl_layout->type) {
            H5O_pline_t dcpl_pline; /* Object's I/O pipeline information */

            /* Get I/O pipeline information */
            if (H5P_peek(dc_plist, H5O_CRT_PIPELINE_NAME, &dcpl_pline) < 0)
                HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't retrieve pipeline filter")

            /* Check if the chunks have filters */
            if (dcpl_pline.nused > 0) {
                hsize_t chunk_dims[H5O_LAYOUT_NDIMS]; /* Size of chunk dimensions */
                H5S_t  *space;                        /* Dataspace describing chunk */
                size_t  u;                            /* Local index variable */

                /* Create a dataspace for a chunk & set the extent */
                for (u = 0; u < dcpl_layout->u.chunk.ndims; u++)
                    chunk_dims[u] = dcpl_layout->u.chunk.dim[u];
                if (NULL == (space = H5S_create_simple(dcpl_layout->u.chunk.ndims, chunk_dims, NULL)))
                    HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "can't create simple dataspace")

                /* Get ID for dataspace to pass to filter routines */
                if ((space_id = H5I_register(H5I_DATASPACE, space, FALSE)) < 0) {
                    (void)H5S_close(space);
                    HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register dataspace ID")
                }

                /* Make the callbacks */
                if (H5Z__prelude_callback(&dcpl_pline, dcpl_id, type_id, space_id, prelude_type) < 0)
                    HGOTO_ERROR(H5E_PLINE, H5E_CANAPPLY, FAIL, "unable to apply filter")
            }
        }
    }

done:
    if (space_id > 0 && H5I_dec_ref(space_id) < 0)
        HDONE_ERROR(H5E_PLINE, H5E_CANTRELEASE, FAIL, "unable to close dataspace")

    if (dcpl_layout)
        dcpl_layout = (H5O_layout_t *)H5MM_xfree(dcpl_layout);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__prepare_prelude_callback_dcpl() */

/*-------------------------------------------------------------------------
 * Function: H5Z_can_apply
 *
 * Purpose:  Checks if all the filters defined in the dataset creation
 *           property list can be applied to a particular combination of
 *           datatype and dataspace for a dataset.
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *
 * Notes:    The chunk dimensions are used to create a dataspace, instead
 *           of passing in the dataset's dataspace, since the chunk
 *           dimensions are what the I/O filter will actually see
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_can_apply(hid_t dcpl_id, hid_t type_id)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Make "can apply" callbacks for filters in pipeline */
    if (H5Z__prepare_prelude_callback_dcpl(dcpl_id, type_id, H5Z_PRELUDE_CAN_APPLY) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANAPPLY, FAIL, "unable to apply filter")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_can_apply() */

/*-------------------------------------------------------------------------
 * Function: H5Z_set_local
 *
 * Purpose:  Makes callbacks to modify dataset creation list property
 *           settings for filters on a new dataset, based on the datatype
 *           and dataspace of that dataset (chunk).
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *
 * Notes:    The chunk dimensions are used to create a dataspace, instead
 *           of passing in the dataset's dataspace, since the chunk
 *           dimensions are what the I/O filter will actually see
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_set_local(hid_t dcpl_id, hid_t type_id)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Make "set local" callbacks for filters in pipeline */
    if (H5Z__prepare_prelude_callback_dcpl(dcpl_id, type_id, H5Z_PRELUDE_SET_LOCAL) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_SETLOCAL, FAIL, "local filter parameters not set")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_set_local() */

/*-------------------------------------------------------------------------
 * Function: H5Z_can_apply_direct
 *
 * Purpose:  Checks if all the filters defined in the pipeline can be
 *           applied to an opaque byte stream (currently only a group).
 *           The pipeline is assumed to have at least one filter.
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_can_apply_direct(const H5O_pline_t *pline)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(pline->nused > 0);

    /* Make "can apply" callbacks for filters in pipeline */
    if (H5Z__prelude_callback(pline, (hid_t)-1, (hid_t)-1, (hid_t)-1, H5Z_PRELUDE_CAN_APPLY) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANAPPLY, FAIL, "unable to apply filter")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_can_apply_direct() */

/*-------------------------------------------------------------------------
 * Function: H5Z_set_local_direct
 *
 * Purpose:  Makes callbacks to modify local settings for filters on a
 *           new opaque object.  The pipeline is assumed to have at
 *           least one filter.
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *
 * Notes:    This callback will almost certainly not do anything
 *           useful, other than to make certain that the filter will
 *           accept opaque data.
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_set_local_direct(const H5O_pline_t *pline)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(pline->nused > 0);

    /* Make "set local" callbacks for filters in pipeline */
    if (H5Z__prelude_callback(pline, (hid_t)-1, (hid_t)-1, (hid_t)-1, H5Z_PRELUDE_SET_LOCAL) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_SETLOCAL, FAIL, "local filter parameters not set")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_set_local_direct() */

/*-------------------------------------------------------------------------
 * Function: H5Z_ignore_filters
 *
 * Purpose:  Determine whether filters can be ignored.
 *
 * Description:
 *      When the filters are optional (i.e., H5Z_FLAG_OPTIONAL is provided,)
 *      if any of the following conditions is met, the filters will be ignored:
 *          - dataspace is either H5S_NULL or H5S_SCALAR
 *          - datatype is variable-length (string or non-string)
 *      However, if any of these conditions exists and a filter is not
 *      optional, the function will produce an error.
 *
 * Return:   Non-negative(TRUE/FALSE) on success
 *           Negative on failure
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5Z_ignore_filters(hid_t dcpl_id, const H5T_t *type, const H5S_t *space)
{
    H5P_genplist_t *dc_plist;                /* Dataset creation property list object */
    H5O_pline_t     pline;                   /* Object's I/O pipeline information */
    H5S_class_t     space_class;             /* To check class of space */
    H5T_class_t     type_class;              /* To check if type is VL */
    bool            bad_for_filters = FALSE; /* Suitable to have filters */
    htri_t          ret_value       = FALSE; /* TRUE for ignoring filters */

    FUNC_ENTER_NOAPI(FAIL)

    if (NULL == (dc_plist = (H5P_genplist_t *)H5I_object(dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't get dataset creation property list")

    /* Get pipeline information */
    if (H5P_peek(dc_plist, H5O_CRT_PIPELINE_NAME, &pline) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't retrieve pipeline filter")

    /* Get datatype and dataspace classes for quick access */
    space_class = H5S_GET_EXTENT_TYPE(space);
    type_class  = H5T_get_class(type, FALSE);

    /* These conditions are not suitable for filters */
    bad_for_filters = (H5S_NULL == space_class || H5S_SCALAR == space_class || H5T_VLEN == type_class ||
                       (H5T_STRING == type_class && TRUE == H5T_is_variable_str(type)));

    /* When these conditions occur, if there are required filters in pline,
       then report a failure, otherwise, set flag that they can be ignored */
    if (bad_for_filters) {
        size_t ii;
        if (pline.nused > 0) {
            for (ii = 0; ii < pline.nused; ii++) {
                if (!(pline.filter[ii].flags & H5Z_FLAG_OPTIONAL))
                    HGOTO_ERROR(H5E_PLINE, H5E_CANTFILTER, FAIL, "not suitable for filters")
            }

            /* All filters are optional, we can ignore them */
            ret_value = TRUE;
        }
    } /* bad for filters */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_ignore_filters() */

/*-------------------------------------------------------------------------
 * Function: H5Z_modify
 *
 * Purpose:  Modify filter parameters for specified pipeline.
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_modify(const H5O_pline_t *pline, H5Z_filter_t filter, unsigned flags, size_t cd_nelmts,
           const unsigned int cd_values[/*cd_nelmts*/])
{
    size_t idx;                 /* Index of filter in pipeline */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(pline);
    HDassert(filter >= 0 && filter <= H5Z_FILTER_MAX);
    HDassert(0 == (flags & ~((unsigned)H5Z_FLAG_DEFMASK)));
    HDassert(0 == cd_nelmts || cd_values);

    /* Locate the filter in the pipeline */
    for (idx = 0; idx < pline->nused; idx++)
        if (pline->filter[idx].id == filter)
            break;

    /* Check if the filter was not already in the pipeline */
    if (idx > pline->nused)
        HGOTO_ERROR(H5E_PLINE, H5E_NOTFOUND, FAIL, "filter not in pipeline")

    /* Change parameters for filter */
    pline->filter[idx].flags     = flags;
    pline->filter[idx].cd_nelmts = cd_nelmts;

    /* Free any existing parameters */
    if (pline->filter[idx].cd_values != NULL && pline->filter[idx].cd_values != pline->filter[idx]._cd_values)
        H5MM_xfree(pline->filter[idx].cd_values);

    /* Set parameters */
    if (cd_nelmts > 0) {
        size_t i; /* Local index variable */

        /* Allocate memory or point at internal buffer */
        if (cd_nelmts > H5Z_COMMON_CD_VALUES) {
            pline->filter[idx].cd_values = (unsigned *)H5MM_malloc(cd_nelmts * sizeof(unsigned));
            if (NULL == pline->filter[idx].cd_values)
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for filter parameters")
        } /* end if */
        else
            pline->filter[idx].cd_values = pline->filter[idx]._cd_values;

        /* Copy client data values */
        for (i = 0; i < cd_nelmts; i++)
            pline->filter[idx].cd_values[i] = cd_values[i];
    } /* end if */
    else
        pline->filter[idx].cd_values = NULL;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_modify() */

/*-------------------------------------------------------------------------
 * Function: H5Z_append
 *
 * Purpose:  Append another filter to the specified pipeline.
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_append(H5O_pline_t *pline, H5Z_filter_t filter, unsigned flags, size_t cd_nelmts,
           const unsigned int cd_values[/*cd_nelmts*/])
{
    size_t idx;
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(pline);
    HDassert(filter >= 0 && filter <= H5Z_FILTER_MAX);
    HDassert(0 == (flags & ~((unsigned)H5Z_FLAG_DEFMASK)));
    HDassert(0 == cd_nelmts || cd_values);

    /*
     * Check filter limit.  We do it here for early warnings although we may
     * decide to relax this restriction in the future.
     */
    if (pline->nused >= H5Z_MAX_NFILTERS)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "too many filters in pipeline")

    /* Check for freshly allocated filter pipeline */
    if (pline->version == 0)
        pline->version = H5O_PLINE_VERSION_1;

    /* Allocate additional space in the pipeline if it's full */
    if (pline->nused >= pline->nalloc) {
        H5O_pline_t x;
        size_t      n;

        /* Each filter's data may be stored internally or may be
         * a separate block of memory.
         * For each filter, if cd_values points to the internal array
         * _cd_values, the pointer will need to be updated when the
         * filter struct is reallocated.  Set these pointers to ~NULL
         * so that we can reset them after reallocating the filters array.
         */
        for (n = 0; n < pline->nalloc; ++n)
            if (pline->filter[n].cd_values == pline->filter[n]._cd_values)
                pline->filter[n].cd_values = (unsigned *)((void *)~((size_t)NULL));

        x.nalloc = MAX(H5Z_MAX_NFILTERS, 2 * pline->nalloc);
        x.filter = (H5Z_filter_info_t *)H5MM_realloc(pline->filter, x.nalloc * sizeof(x.filter[0]));
        if (NULL == x.filter)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for filter pipeline")

        /* Fix pointers in previous filters that need to point to their own
         *      internal data.
         */
        for (n = 0; n < pline->nalloc; ++n)
            if (x.filter[n].cd_values == (void *)~((size_t)NULL))
                x.filter[n].cd_values = x.filter[n]._cd_values;

        /* Point to newly allocated buffer */
        pline->nalloc = x.nalloc;
        pline->filter = x.filter;
    } /* end if */

    /* Add the new filter to the pipeline */
    idx                          = pline->nused;
    pline->filter[idx].id        = filter;
    pline->filter[idx].flags     = flags;
    pline->filter[idx].name      = NULL; /*we'll pick it up later*/
    pline->filter[idx].cd_nelmts = cd_nelmts;
    if (cd_nelmts > 0) {
        size_t i; /* Local index variable */

        /* Allocate memory or point at internal buffer */
        if (cd_nelmts > H5Z_COMMON_CD_VALUES) {
            pline->filter[idx].cd_values = (unsigned *)H5MM_malloc(cd_nelmts * sizeof(unsigned));
            if (NULL == pline->filter[idx].cd_values)
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for filter")
        } /* end if */
        else
            pline->filter[idx].cd_values = pline->filter[idx]._cd_values;

        /* Copy client data values */
        for (i = 0; i < cd_nelmts; i++)
            pline->filter[idx].cd_values[i] = cd_values[i];
    } /* end if */
    else
        pline->filter[idx].cd_values = NULL;

    pline->nused++;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_append() */

/*-------------------------------------------------------------------------
 * Function: H5Z__find_idx
 *
 * Purpose:  Given a filter ID return the offset in the global array
 *           that holds all the registered filters.
 *
 * Return:   Success:    Non-negative index of entry in global filter table.
 *           Failure:    Negative
 *-------------------------------------------------------------------------
 */
static int
H5Z__find_idx(H5Z_filter_t id)
{
    size_t i;                /* Local index variable */
    int    ret_value = FAIL; /* Return value */

    FUNC_ENTER_STATIC_NOERR

    for (i = 0; i < H5Z_table_used_g; i++)
        if (H5Z_table_g[i].id == id)
            HGOTO_DONE((int)i)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z__find_idx() */

/*-------------------------------------------------------------------------
 * Function: H5Z_find
 *
 * Purpose:  Given a filter ID return a pointer to a global struct that
 *           defines the filter.
 *
 * Return:   Success:    Ptr to entry in global filter table.
 *           Failure:    NULL
 *-------------------------------------------------------------------------
 */
H5Z_class2_t *
H5Z_find(H5Z_filter_t id)
{
    int           idx;              /* Filter index in global table */
    H5Z_class2_t *ret_value = NULL; /* Return value */

    FUNC_ENTER_NOAPI(NULL)

    /* Get the index in the global table */
    if ((idx = H5Z__find_idx(id)) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_NOTFOUND, NULL, "required filter %d is not registered", id)

    /* Set return value */
    ret_value = H5Z_table_g + idx;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5Z_find() */

/*-------------------------------------------------------------------------
 * Function: H5Z_pipeline
 *
 * Purpose:  Process data through the filter pipeline.  The FLAGS argument
 *           is the filter invocation flags (definition flags come from
 *           the PLINE->filter[].flags).  The filters are processed in
 *           definition order unless the H5Z_FLAG_REVERSE is set.  The
 *           FILTER_MASK is a bit-mask to indicate which filters to skip
 *           and on exit will indicate which filters failed.  Each
 *           filter has an index number in the pipeline and that index
 *           number is the filter's bit in the FILTER_MASK.  NBYTES is the
 *           number of bytes of data to filter and on exit should be the
 *           number of resulting bytes while BUF_SIZE holds the total
 *           allocated size of the buffer, which is pointed to BUF.
 *
 *           If the buffer must grow during processing of the pipeline
 *           then the pipeline function should free the original buffer
 *           and return a fresh buffer, adjusting BUF_SIZE accordingly.
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_pipeline(const H5O_pline_t *pline, unsigned flags, unsigned *filter_mask /*in,out*/, H5Z_EDC_t edc_read,
             H5Z_cb_t cb_struct, size_t *nbytes /*in,out*/, size_t *buf_size /*in,out*/,
             void **buf /*in,out*/)
{
    size_t        idx;
    size_t        new_nbytes;
    int           fclass_idx;    /* Index of filter class in global table */
    H5Z_class2_t *fclass = NULL; /* Filter class pointer */
#ifdef H5Z_DEBUG
    H5Z_stats_t  *fstats = NULL; /* Filter stats pointer */
    H5_timer_t    timer;         /* Timer for filter operations */
    H5_timevals_t times;         /* Elapsed time for each operation */
#endif
    unsigned failed = 0;
    unsigned tmp_flags;
    size_t   i;
    herr_t   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(0 == (flags & ~((unsigned)H5Z_FLAG_INVMASK)));
    HDassert(filter_mask);
    HDassert(nbytes && *nbytes > 0);
    HDassert(buf_size && *buf_size > 0);
    HDassert(buf && *buf);
    HDassert(!pline || pline->nused < H5Z_MAX_NFILTERS);

#ifdef H5Z_DEBUG
    H5_timer_init(&timer);
#endif
    if (pline && (flags & H5Z_FLAG_REVERSE)) { /* Read */
        for (i = pline->nused; i > 0; --i) {
            idx = i - 1;
            if (*filter_mask & ((unsigned)1 << idx)) {
                failed |= (unsigned)1 << idx;
                continue; /* filter excluded */
            }

            /* If the filter isn't registered and the application doesn't
             * indicate no plugin through HDF5_PRELOAD_PLUG (using the symbol "::"),
             * try to load it dynamically and register it.  Otherwise, return failure
             */
            if ((fclass_idx = H5Z__find_idx(pline->filter[idx].id)) < 0) {
                H5PL_key_t          key;
                const H5Z_class2_t *filter_info;
                hbool_t             issue_error = FALSE;

                /* Try loading the filter */
                key.id = (int)(pline->filter[idx].id);
                if (NULL != (filter_info = (const H5Z_class2_t *)H5PL_load(H5PL_TYPE_FILTER, key))) {
                    /* Register the filter we loaded */
                    if (H5Z_register(filter_info) < 0)
                        HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, FAIL, "unable to register filter")

                    /* Search in the table of registered filters again to find the dynamic filter just loaded
                     * and registered */
                    if ((fclass_idx = H5Z__find_idx(pline->filter[idx].id)) < 0)
                        issue_error = TRUE;
                }
                else
                    issue_error = TRUE;

                /* Check for error */
                if (issue_error) {
                    /* Print out the filter name to give more info.  But the name is optional for
                     * the filter */
                    if (pline->filter[idx].name)
                        HGOTO_ERROR(H5E_PLINE, H5E_READERROR, FAIL, "required filter '%s' is not registered",
                                    pline->filter[idx].name)
                    else
                        HGOTO_ERROR(H5E_PLINE, H5E_READERROR, FAIL,
                                    "required filter (name unavailable) is not registered")
                }
            } /* end if */

            fclass = &H5Z_table_g[fclass_idx];

#ifdef H5Z_DEBUG
            fstats = &H5Z_stat_table_g[fclass_idx];
            H5_timer_start(&timer);
#endif

            tmp_flags = flags | (pline->filter[idx].flags);
            tmp_flags |= (edc_read == H5Z_DISABLE_EDC) ? H5Z_FLAG_SKIP_EDC : 0;
            new_nbytes = (fclass->filter)(tmp_flags, pline->filter[idx].cd_nelmts,
                                          pline->filter[idx].cd_values, *nbytes, buf_size, buf);

#ifdef H5Z_DEBUG
            H5_timer_stop(&timer);
            H5_timer_get_times(timer, &times);
            fstats->stats[1].times.elapsed += times.elapsed;
            fstats->stats[1].times.system += times.system;
            fstats->stats[1].times.user += times.user;

            fstats->stats[1].total += MAX(*nbytes, new_nbytes);
            if (0 == new_nbytes)
                fstats->stats[1].errors += *nbytes;
#endif

            if (0 == new_nbytes) {
                if ((cb_struct.func && (H5Z_CB_FAIL == cb_struct.func(pline->filter[idx].id, *buf, *buf_size,
                                                                      cb_struct.op_data))) ||
                    !cb_struct.func)
                    HGOTO_ERROR(H5E_PLINE, H5E_READERROR, FAIL, "filter returned failure during read")

                *nbytes = *buf_size;
                failed |= (unsigned)1 << idx;
                H5E_clear_stack(NULL);
            }
            else
                *nbytes = new_nbytes;
        }
    }
    else if (pline) { /* Write */
        for (idx = 0; idx < pline->nused; idx++) {
            if (*filter_mask & ((unsigned)1 << idx)) {
                failed |= (unsigned)1 << idx;
                continue; /* filter excluded */
            }
            if ((fclass_idx = H5Z__find_idx(pline->filter[idx].id)) < 0) {
                /* Check if filter is optional -- If it isn't, then error */
                if ((pline->filter[idx].flags & H5Z_FLAG_OPTIONAL) == 0)
                    HGOTO_ERROR(H5E_PLINE, H5E_WRITEERROR, FAIL, "required filter is not registered")
                failed |= (unsigned)1 << idx;
                H5E_clear_stack(NULL);
                continue; /* filter excluded */
            }             /* end if */

            fclass = &H5Z_table_g[fclass_idx];

#ifdef H5Z_DEBUG
            fstats = &H5Z_stat_table_g[fclass_idx];
            H5_timer_start(&timer);
#endif

            new_nbytes = (fclass->filter)(flags | (pline->filter[idx].flags), pline->filter[idx].cd_nelmts,
                                          pline->filter[idx].cd_values, *nbytes, buf_size, buf);

#ifdef H5Z_DEBUG
            H5_timer_stop(&timer);
            H5_timer_get_times(timer, &times);
            fstats->stats[0].times.elapsed += times.elapsed;
            fstats->stats[0].times.system += times.system;
            fstats->stats[0].times.user += times.user;

            fstats->stats[0].total += MAX(*nbytes, new_nbytes);
            if (0 == new_nbytes)
                fstats->stats[0].errors += *nbytes;
#endif

            if (0 == new_nbytes) {
                if (0 == (pline->filter[idx].flags & H5Z_FLAG_OPTIONAL)) {
                    if ((cb_struct.func && (H5Z_CB_FAIL == cb_struct.func(pline->filter[idx].id, *buf,
                                                                          *nbytes, cb_struct.op_data))) ||
                        !cb_struct.func)
                        HGOTO_ERROR(H5E_PLINE, H5E_WRITEERROR, FAIL, "filter returned failure")

                    *nbytes = *buf_size;
                }
                failed |= (unsigned)1 << idx;
                H5E_clear_stack(NULL);
            }
            else
                *nbytes = new_nbytes;
        } /* end for */
    }

    *filter_mask = failed;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}

/*-------------------------------------------------------------------------
 * Function: H5Z_filter_info
 *
 * Purpose:  Get pointer to filter info for pipeline
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *-------------------------------------------------------------------------
 */
H5Z_filter_info_t *
H5Z_filter_info(const H5O_pline_t *pline, H5Z_filter_t filter)
{
    size_t             idx;              /* Index of filter in pipeline */
    H5Z_filter_info_t *ret_value = NULL; /* Return value */

    FUNC_ENTER_NOAPI(NULL)

    HDassert(pline);
    HDassert(filter >= 0 && filter <= H5Z_FILTER_MAX);

    /* Locate the filter in the pipeline */
    for (idx = 0; idx < pline->nused; idx++)
        if (pline->filter[idx].id == filter)
            break;

    /* Check if the filter was not already in the pipeline */
    if (idx >= pline->nused)
        HGOTO_ERROR(H5E_PLINE, H5E_NOTFOUND, NULL, "filter not in pipeline")

    /* Set return value */
    ret_value = &pline->filter[idx];

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_filter_info() */

/*-------------------------------------------------------------------------
 * Function: H5Z_filter_in_pline
 *
 * Purpose:  Check whether a filter is in the filter pipeline using the
 *           filter ID.  This function is very similar to H5Z_filter_info
 *
 * Return:   TRUE   - found filter
 *           FALSE  - not found
 *           FAIL   - error
 *-------------------------------------------------------------------------
 */
htri_t
H5Z_filter_in_pline(const H5O_pline_t *pline, H5Z_filter_t filter)
{
    size_t idx;              /* Index of filter in pipeline */
    htri_t ret_value = TRUE; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(pline);
    HDassert(filter >= 0 && filter <= H5Z_FILTER_MAX);

    /* Locate the filter in the pipeline */
    for (idx = 0; idx < pline->nused; idx++)
        if (pline->filter[idx].id == filter)
            break;

    /* Check if the filter was not already in the pipeline */
    if (idx >= pline->nused)
        ret_value = FALSE;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_filter_in_pline() */

/*-------------------------------------------------------------------------
 * Function: H5Z_all_filters_avail
 *
 * Purpose:  Verify that all the filters in a pipeline are currently
 *           available (i.e. registered)
 *
 * Return:   Non-negative (TRUE/FALSE) on success
 *           Negative on failure
 *-------------------------------------------------------------------------
 */
htri_t
H5Z_all_filters_avail(const H5O_pline_t *pline)
{
    size_t i, j;             /* Local index variable */
    htri_t ret_value = TRUE; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Check args */
    HDassert(pline);

    /* Iterate through all the filters in pipeline */
    for (i = 0; i < pline->nused; i++) {
        /* Look for each filter in the list of registered filters */
        for (j = 0; j < H5Z_table_used_g; j++)
            if (H5Z_table_g[j].id == pline->filter[i].id)
                break;

        /* Check if we didn't find the filter */
        if (j == H5Z_table_used_g)
            HGOTO_DONE(FALSE)
    } /* end for */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_all_filters_avail() */

/*-------------------------------------------------------------------------
 * Function: H5Z_delete
 *
 * Purpose:  Delete filter FILTER from pipeline PLINE;
 *           deletes all filters if FILTER is H5Z_FILTER_NONE
 *
 * Return:   Non-negative on success
 *           Negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_delete(H5O_pline_t *pline, H5Z_filter_t filter)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Check args */
    HDassert(pline);
    HDassert(filter >= 0 && filter <= H5Z_FILTER_MAX);

    /* if the pipeline has no filters, just return */
    if (pline->nused == 0)
        HGOTO_DONE(SUCCEED)

    /* Delete all filters */
    if (H5Z_FILTER_ALL == filter) {
        if (H5O_msg_reset(H5O_PLINE_ID, pline) < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTFREE, FAIL, "can't release pipeline info")
    }
    /* Delete filter */
    else {
        size_t  idx;           /* Index of filter in pipeline */
        hbool_t found = FALSE; /* Indicate filter was found in pipeline */

        /* Locate the filter in the pipeline */
        for (idx = 0; idx < pline->nused; idx++)
            if (pline->filter[idx].id == filter) {
                found = TRUE;
                break;
            }

        /* filter was not found in the pipeline */
        if (!found)
            HGOTO_ERROR(H5E_PLINE, H5E_NOTFOUND, FAIL, "filter not in pipeline")

        /* Free information for deleted filter */
        if (pline->filter[idx].name && pline->filter[idx].name != pline->filter[idx]._name)
            HDassert((HDstrlen(pline->filter[idx].name) + 1) > H5Z_COMMON_NAME_LEN);
        if (pline->filter[idx].name != pline->filter[idx]._name)
            pline->filter[idx].name = (char *)H5MM_xfree(pline->filter[idx].name);
        if (pline->filter[idx].cd_values && pline->filter[idx].cd_values != pline->filter[idx]._cd_values)
            HDassert(pline->filter[idx].cd_nelmts > H5Z_COMMON_CD_VALUES);
        if (pline->filter[idx].cd_values != pline->filter[idx]._cd_values)
            pline->filter[idx].cd_values = (unsigned *)H5MM_xfree(pline->filter[idx].cd_values);

        /* Remove filter from pipeline array */
        if ((idx + 1) < pline->nused) {
            /* Copy filters down & fix up any client data value arrays using internal storage */
            for (; (idx + 1) < pline->nused; idx++) {
                pline->filter[idx] = pline->filter[idx + 1];
                if (pline->filter[idx].name && (HDstrlen(pline->filter[idx].name) + 1) <= H5Z_COMMON_NAME_LEN)
                    pline->filter[idx].name = pline->filter[idx]._name;
                if (pline->filter[idx].cd_nelmts <= H5Z_COMMON_CD_VALUES)
                    pline->filter[idx].cd_values = pline->filter[idx]._cd_values;
            }
        }

        /* Decrement number of used filters */
        pline->nused--;

        /* Reset information for previous last filter in pipeline */
        HDmemset(&pline->filter[pline->nused], 0, sizeof(H5Z_filter_info_t));
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_delete() */

/*-------------------------------------------------------------------------
 * Function: H5Zget_filter_info
 *
 * Purpose:  Gets information about a pipeline data filter and stores it
 *           in filter_config_flags.
 *
 * Return:   zero on success
 *           negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Zget_filter_info(H5Z_filter_t filter, unsigned int *filter_config_flags)
{
    herr_t ret_value = SUCCEED;

    FUNC_ENTER_API(FAIL)
    H5TRACE2("e", "Zf*Iu", filter, filter_config_flags);

    /* Get the filter info */
    if (H5Z_get_filter_info(filter, filter_config_flags) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "Filter info not retrieved")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Zget_filter_info() */

/*-------------------------------------------------------------------------
 * Function: H5Z_get_filter_info
 *
 * Purpose:  Gets information about a pipeline data filter and stores it
 *           in filter_config_flags.
 *
 * Return:   zero on success
 *           negative on failure
 *-------------------------------------------------------------------------
 */
herr_t
H5Z_get_filter_info(H5Z_filter_t filter, unsigned int *filter_config_flags)
{
    H5Z_class2_t *fclass;
    herr_t        ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(FAIL)

    /* Look up the filter class info */
    if (NULL == (fclass = H5Z_find(filter)))
        HGOTO_ERROR(H5E_PLINE, H5E_BADVALUE, FAIL, "Filter not defined")

    /* Set the filter config flags for the application */
    if (filter_config_flags != NULL) {
        *filter_config_flags = 0;

        if (fclass->encoder_present)
            *filter_config_flags |= H5Z_FILTER_CONFIG_ENCODE_ENABLED;
        if (fclass->decoder_present)
            *filter_config_flags |= H5Z_FILTER_CONFIG_DECODE_ENABLED;
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5Z_get_filter_info() */