summaryrefslogtreecommitdiffstats
path: root/src/H5Sselect.c
blob: 6b8006410bc0fbba4128ca681fe1eefb3b4da299 (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
/*
 * Copyright (C) 1998-2001 NCSA
 *                         All rights reserved.
 *
 * Programmer:  Quincey Koziol <koziol@ncsa.uiuc.ued>
 *              Friday, May 29, 1998
 *
 * Purpose:	Dataspace functions.
 */

#define H5S_PACKAGE		/*suppress error about including H5Spkg	  */

#include "H5private.h"
#include "H5Eprivate.h"
#include "H5FLprivate.h"	/*Free Lists	  */
#include "H5Iprivate.h"
#include "H5MMprivate.h"
#include "H5Spkg.h"
#include "H5Vprivate.h"

/* Interface initialization */
#define PABLO_MASK      H5Sselect_mask
#define INTERFACE_INIT  NULL
static int             interface_initialize_g = 0;

static hssize_t H5S_get_select_hyper_nblocks(H5S_t *space);
static hssize_t H5S_get_select_elem_npoints(H5S_t *space);
static herr_t H5S_get_select_hyper_blocklist(H5S_t *space, hsize_t startblock, hsize_t numblocks, hsize_t *buf);
static herr_t H5S_get_select_elem_pointlist(H5S_t *space, hsize_t startpoint, hsize_t numpoints, hsize_t *buf);
static herr_t H5S_get_select_bounds(H5S_t *space, hsize_t *start, hsize_t *end);

/* Declare external the free list for hssize_t arrays */
H5FL_ARR_EXTERN(hssize_t);


/*--------------------------------------------------------------------------
 NAME
    H5S_select_copy
 PURPOSE
    Copy a selection from one dataspace to another
 USAGE
    herr_t H5S_select_copy(dst, src)
        H5S_t *dst;  OUT: Pointer to the destination dataspace
        H5S_t *src;  IN: Pointer to the source dataspace
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Copies all the selection information (include offset) from the source
    dataspace to the destination dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_copy (H5S_t *dst, const H5S_t *src)
{
    herr_t ret_value=SUCCEED;     /* return value */

    FUNC_ENTER (H5S_select_copy, FAIL);

    /* Check args */
    assert(dst);
    assert(src);

    /* Copy regular fields */
    dst->select=src->select;

/* Need to copy order information still */

    /* Copy offset information */
    if (NULL==(dst->select.offset = H5FL_ARR_ALLOC(hssize_t,src->extent.u.simple.rank,1))) {
        HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL,
		       "memory allocation failed");
    }
    if(src->select.offset!=NULL)
        HDmemcpy(dst->select.offset,src->select.offset,(src->extent.u.simple.rank*sizeof(hssize_t)));

    /* Perform correct type of copy based on the type of selection */
    switch (src->extent.type) {
        case H5S_SCALAR:
            /*nothing needed */
            break;

        case H5S_SIMPLE:
            /* Deep copy extra stuff */
            switch(src->select.type) {
                case H5S_SEL_NONE:
                case H5S_SEL_ALL:
                    /*nothing needed */
                    break;

                case H5S_SEL_POINTS:
                    ret_value=H5S_point_copy(dst,src);
                    break;

                case H5S_SEL_HYPERSLABS:
                    ret_value=H5S_hyper_copy(dst,src);
                    break;

                default:
                    assert("unknown selection type" && 0);
                    break;
            } /* end switch */
            break;

        case H5S_COMPLEX:
            /*void */
            break;

        default:
            assert("unknown data space type" && 0);
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_select_copy() */

/*--------------------------------------------------------------------------
 NAME
    H5S_select_release
 PURPOSE
    Release selection information for a dataspace
 USAGE
    herr_t H5S_select_release(space)
        H5S_t *space;       IN: Pointer to dataspace
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Releases all selection information for a dataspace
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_release (H5S_t *space)
{
    herr_t ret_value=SUCCEED;     /* return value */

    FUNC_ENTER (H5S_select_release, FAIL);

    /* Check args */
    assert (space);

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_release(space);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_release(space);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=H5S_all_release(space);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    /* Reset type of selection to "all" */
    space->select.type=H5S_SEL_ALL;

    FUNC_LEAVE (ret_value);
}   /* H5S_select_release() */


/*--------------------------------------------------------------------------
 NAME
    H5Sget_select_npoints
 PURPOSE
    Get the number of elements in current selection
 USAGE
    hssize_t H5Sget_select_npoints(dsid)
        hid_t dsid;             IN: Dataspace ID of selection to query
 RETURNS
    The number of elements in selection on success, 0 on failure
 DESCRIPTION
    Returns the number of elements in current selection for dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
hssize_t
H5Sget_select_npoints(hid_t spaceid)
{
    H5S_t	*space = NULL;      /* Dataspace to modify selection of */
    hssize_t ret_value=FAIL;        /* return value */

    FUNC_ENTER (H5Sget_select_npoints, 0);
    H5TRACE1("Hs","i",spaceid);

    /* Check args */
    if (H5I_DATASPACE != H5I_get_type(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a data space");
    }

    ret_value = H5S_get_select_npoints(space);

    FUNC_LEAVE (ret_value);
}   /* H5Sget_select_npoints() */

/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_npoints
 PURPOSE
    Get the number of elements in current selection
 USAGE
    herr_t H5S_get_select_npoints(ds)
        H5S_t *ds;             IN: Dataspace pointer
 RETURNS
    The number of elements in selection on success, 0 on failure
 DESCRIPTION
    Returns the number of elements in current selection for dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
hssize_t
H5S_get_select_npoints (const H5S_t *space)
{
    hssize_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_get_select_npoints, FAIL);

    assert(space);

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_npoints(space);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_npoints(space);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=H5S_all_npoints(space);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=0;
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_get_select_npoints() */

/*--------------------------------------------------------------------------
 NAME
    H5S_sel_iter_release
 PURPOSE
    Release selection iterator information for a dataspace
 USAGE
    herr_t H5S_sel_iter_release(sel_iter)
        const H5S_t *space;             IN: Pointer to dataspace iterator is for
        H5S_sel_iter_t *sel_iter;       IN: Pointer to selection iterator
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Releases all information for a dataspace selection iterator
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_sel_iter_release (const H5S_t *space, H5S_sel_iter_t *sel_iter)
{
    herr_t ret_value=SUCCEED;     /* Return value */

    FUNC_ENTER (H5S_sel_iter_release, FAIL);

    /* Check args */
    assert (sel_iter);

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
        case H5S_SEL_ALL:            /* Entire extent selected */
            /* no action needed */
            ret_value=SUCCEED;
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_sel_iter_release(sel_iter);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_sel_iter_release() */

/*--------------------------------------------------------------------------
 NAME
    H5Sselect_valid
 PURPOSE
    Check whether the selection fits within the extent, with the current
    offset defined.
 USAGE
    htri_t H5Sselect_void(dsid)
        hid_t dsid;             IN: Dataspace ID to query
 RETURNS
    TRUE if the selection fits within the extent, FALSE if it does not and
        Negative on an error.
 DESCRIPTION
    Determines if the current selection at the current offet fits within the
    extent for the dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5Sselect_valid(hid_t spaceid)
{
    H5S_t	*space = NULL;      /* Dataspace to modify selection of */
    htri_t ret_value=FAIL;     /* return value */

    FUNC_ENTER (H5Sselect_valid, 0);
    H5TRACE1("b","i",spaceid);

    /* Check args */
    if (H5I_DATASPACE != H5I_get_type(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a data space");
    }

    ret_value = H5S_select_valid(space);

    FUNC_LEAVE (ret_value);
}   /* H5Sselect_valid() */

/*--------------------------------------------------------------------------
 NAME
    H5S_select_valid
 PURPOSE
    Check whether the selection fits within the extent, with the current
    offset defined.
 USAGE
    htri_t H5Sselect_void(space)
        H5S_t *space;             IN: Dataspace pointer to query
 RETURNS
    TRUE if the selection fits within the extent, FALSE if it does not and
        Negative on an error.
 DESCRIPTION
    Determines if the current selection at the current offet fits within the
    extent for the dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_valid (const H5S_t *space)
{
    htri_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_select_valid, FAIL);

    assert(space);

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_valid(space);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_valid(space);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=TRUE;
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_select_valid() */

/*--------------------------------------------------------------------------
 NAME
    H5S_select_serial_size
 PURPOSE
    Determine the number of bytes needed to serialize the current selection
    offset defined.
 USAGE
    hssize_t H5S_select_serial_size(space)
        H5S_t *space;             IN: Dataspace pointer to query
 RETURNS
    The number of bytes required on success, negative on an error.
 DESCRIPTION
    Determines the number of bytes required to serialize the current selection
    information for storage on disk.  This routine just hands off to the
    appropriate routine for each type of selection.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
hssize_t
H5S_select_serial_size (const H5S_t *space)
{
    hssize_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_select_serial_size, FAIL);

    assert(space);

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_serial_size(space);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_serial_size(space);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=16;            /* replace with real function call at some point */
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_select_serial_size() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_serialize
 PURPOSE
    Serialize the current selection into a user-provided buffer.
 USAGE
    herr_t H5S_select_serialize(space, buf)
        H5S_t *space;           IN: Dataspace pointer of selection to serialize
        uint8 *buf;             OUT: Buffer to put serialized selection into
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Serializes the current selection into a buffer.  (Primarily for storing
    on disk).  This routine just hands off to the appropriate routine for each
    type of selection.
    The serialized information for all types of selections follows this format:
        <type of selection> = uint32
        <version #>         = uint32
        <padding, not-used> = 4 bytes
        <length of selection specific information> = uint32
        <selection specific information> = ? bytes (depends on selection type)
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_serialize (const H5S_t *space, uint8_t *buf)
{
    herr_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_select_serialize, FAIL);

    assert(space);

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_serialize(space,buf);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_serialize(space,buf);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=H5S_all_select_serialize(space,buf);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=H5S_none_select_serialize(space,buf);
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_select_serialize() */

/*--------------------------------------------------------------------------
 NAME
    H5S_select_deserialize
 PURPOSE
    Deserialize the current selection from a user-provided buffer into a real
        selection in the dataspace.
 USAGE
    herr_t H5S_select_deserialize(space, buf)
        H5S_t *space;           IN/OUT: Dataspace pointer to place selection into
        uint8 *buf;             IN: Buffer to retrieve serialized selection from
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Deserializes the current selection into a buffer.  (Primarily for retrieving
    from disk).  This routine just hands off to the appropriate routine for each
    type of selection.  The format of the serialized information is shown in
    the H5S_select_serialize() header.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_deserialize (H5S_t *space, const uint8_t *buf)
{
    const uint8_t *tbuf;    /* Temporary pointer to the selection type */
    uint32_t sel_type;       /* Pointer to the selection type */
    herr_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_select_deserialize, FAIL);

    assert(space);

    tbuf=buf;
    UINT32DECODE(tbuf, sel_type);
    switch(sel_type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_deserialize(space,buf);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_deserialize(space,buf);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=H5S_all_select_deserialize(space,buf);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=H5S_none_select_deserialize(space,buf);
            break;

        default:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_select_deserialize() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_hyper_nblocks
 PURPOSE
    Get the number of hyperslab blocks in current hyperslab selection
 USAGE
    hssize_t H5S_get_select_hyper_nblocks(space)
        H5S_t *space;             IN: Dataspace ptr of selection to query
 RETURNS
    The number of hyperslab blocks in selection on success, negative on failure
 DESCRIPTION
    Returns the number of hyperslab blocks in current selection for dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static hssize_t
H5S_get_select_hyper_nblocks(H5S_t *space)
{
    hssize_t ret_value=FAIL;        /* return value */
    unsigned u;                    /* Counter */

    FUNC_ENTER_NOINIT(H5S_get_select_hyper_nblocks);

    assert(space);

    /* Check for a "regular" hyperslab selection */
    if(space->select.sel_info.hslab.diminfo != NULL) {
        /* Check each dimension */
        for(ret_value=1,u=0; u<space->extent.u.simple.rank; u++)
            ret_value*=space->select.sel_info.hslab.app_diminfo[u].count;
    } /* end if */
    else
        ret_value = H5S_hyper_span_nblocks(space->select.sel_info.hslab.span_lst);

    FUNC_LEAVE (ret_value);
}   /* H5S_get_select_hyper_nblocks() */


/*--------------------------------------------------------------------------
 NAME
    H5Sget_select_hyper_nblocks
 PURPOSE
    Get the number of hyperslab blocks in current hyperslab selection
 USAGE
    hssize_t H5Sget_select_hyper_nblocks(dsid)
        hid_t dsid;             IN: Dataspace ID of selection to query
 RETURNS
    The number of hyperslab blocks in selection on success, negative on failure
 DESCRIPTION
    Returns the number of hyperslab blocks in current selection for dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
hssize_t
H5Sget_select_hyper_nblocks(hid_t spaceid)
{
    H5S_t	*space = NULL;      /* Dataspace to modify selection of */
    hssize_t ret_value=FAIL;        /* return value */

    FUNC_ENTER (H5Sget_select_hyper_nblocks, FAIL);
    H5TRACE1("Hs","i",spaceid);

    /* Check args */
    if (H5I_DATASPACE != H5I_get_type(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }
    if(space->select.type!=H5S_SEL_HYPERSLABS)
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a hyperslab selection");

    ret_value = H5S_get_select_hyper_nblocks(space);

    FUNC_LEAVE (ret_value);
}   /* H5Sget_select_hyper_nblocks() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_elem_npoints
 PURPOSE
    Get the number of points in current element selection
 USAGE
    hssize_t H5S_get_select_elem_npoints(space)
        H5S_t *space;             IN: Dataspace ptr of selection to query
 RETURNS
    The number of element points in selection on success, negative on failure
 DESCRIPTION
    Returns the number of element points in current selection for dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static hssize_t
H5S_get_select_elem_npoints(H5S_t *space)
{
    hssize_t ret_value=FAIL;        /* return value */

    FUNC_ENTER_NOINIT(H5S_get_select_elem_npoints);

    assert(space);

    ret_value = space->select.num_elem;

    FUNC_LEAVE (ret_value);
}   /* H5Sget_select_elem_npoints() */


/*--------------------------------------------------------------------------
 NAME
    H5Sget_select_elem_npoints
 PURPOSE
    Get the number of points in current element selection
 USAGE
    hssize_t H5Sget_select_elem_npoints(dsid)
        hid_t dsid;             IN: Dataspace ID of selection to query
 RETURNS
    The number of element points in selection on success, negative on failure
 DESCRIPTION
    Returns the number of element points in current selection for dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
hssize_t
H5Sget_select_elem_npoints(hid_t spaceid)
{
    H5S_t	*space = NULL;      /* Dataspace to modify selection of */
    hssize_t ret_value=FAIL;        /* return value */

    FUNC_ENTER (H5Sget_select_elem_npoints, FAIL);
    H5TRACE1("Hs","i",spaceid);

    /* Check args */
    if (H5I_DATASPACE != H5I_get_type(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }
    if(space->select.type!=H5S_SEL_POINTS)
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an element selection");

    ret_value = H5S_get_select_elem_npoints(space);

    FUNC_LEAVE (ret_value);
}   /* H5Sget_select_elem_npoints() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_hyper_blocklist
 PURPOSE
    Get the list of hyperslab blocks currently selected
 USAGE
    herr_t H5S_get_select_hyper_blocklist(space, startblock, numblocks, buf)
        H5S_t *space;           IN: Dataspace pointer of selection to query
        hsize_t startblock;     IN: Hyperslab block to start with
        hsize_t numblocks;      IN: Number of hyperslab blocks to get
        hsize_t *buf;           OUT: List of hyperslab blocks selected
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
        Puts a list of the hyperslab blocks into the user's buffer.  The blocks
    start with the 'startblock'th block in the list of blocks and put
    'numblocks' number of blocks into the user's buffer (or until the end of
    the list of blocks, whichever happens first)
        The block coordinates have the same dimensionality (rank) as the
    dataspace they are located within.  The list of blocks is formatted as
    follows: <"start" coordinate> immediately followed by <"opposite" corner
    coordinate>, followed by the next "start" and "opposite" coordinate, etc.
    until all the block information requested has been put into the user's
    buffer.
        No guarantee of any order of the blocks is implied.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5S_get_select_hyper_blocklist(H5S_t *space, hsize_t startblock, hsize_t numblocks, hsize_t *buf)
{
    H5S_hyper_dim_t *diminfo;               /* Alias for dataspace's diminfo information */
    hsize_t tmp_count[H5O_LAYOUT_NDIMS];    /* Temporary hyperslab counts */
    hssize_t offset[H5O_LAYOUT_NDIMS];      /* Offset of element in dataspace */
    hssize_t start[H5O_LAYOUT_NDIMS];   /* Location of start of hyperslab */
    hssize_t end[H5O_LAYOUT_NDIMS];     /* Location of end of hyperslab */
    hssize_t temp_off;            /* Offset in a given dimension */
    int i;                     /* Counter */
    int fast_dim;      /* Rank of the fastest changing dimension for the dataspace */
    int temp_dim;      /* Temporary rank holder */
    int ndims;         /* Rank of the dataspace */
    int done;          /* Whether we are done with the iteration */
    herr_t ret_value=SUCCEED;   /* return value */

    FUNC_ENTER_NOINIT(H5S_get_select_hyper_blocklist);

    assert(space);
    assert(buf);

    /* Check for a "regular" hyperslab selection */
    if(space->select.sel_info.hslab.diminfo != NULL) {
        /* Set some convienence values */
        ndims=space->extent.u.simple.rank;
        fast_dim=ndims-1;
        /*
         * Use the "application dimension information" to pass back to the user
         * the blocks they set, not the optimized, internal information.
         */
        diminfo=space->select.sel_info.hslab.app_diminfo;

        /* Build the tables of count sizes as well as the initial offset */
        for(i=0; i<ndims; i++) {
            tmp_count[i]=diminfo[i].count;
            offset[i]=diminfo[i].start;
        } /* end for */

        /* We're not done with the iteration */
        done=0;

        /* Go iterate over the hyperslabs */
        while(done==0 && numblocks>0) {
            /* Iterate over the blocks in the fastest dimension */
            while(tmp_count[fast_dim]>0 && numblocks>0) {

                /* Check if we should copy this block information */
                if(startblock==0) {
                    /* Copy the starting location */
                    HDmemcpy(buf,offset,sizeof(hsize_t)*ndims);
                    buf+=ndims;

                    /* Compute the ending location */
                    HDmemcpy(buf,offset,sizeof(hsize_t)*ndims);
                    for(i=0; i<ndims; i++)
                        buf[i]+=(diminfo[i].block-1);
                    buf+=ndims;

                    /* Decrement the number of blocks to retrieve */
                    numblocks--;
                } /* end if */
                else
                    startblock--;

                /* Move the offset to the next sequence to start */
                offset[fast_dim]+=diminfo[fast_dim].stride;

                /* Decrement the block count */
                tmp_count[fast_dim]--;
            } /* end while */

            /* Work on other dimensions if necessary */
            if(fast_dim>0 && numblocks>0) {
                /* Reset the block counts */
                tmp_count[fast_dim]=diminfo[fast_dim].count;

                /* Bubble up the decrement to the slower changing dimensions */
                temp_dim=fast_dim-1;
                while(temp_dim>=0 && done==0) {
                    /* Decrement the block count */
                    tmp_count[temp_dim]--;

                    /* Check if we have more blocks left */
                    if(tmp_count[temp_dim]>0)
                        break;

                    /* Check for getting out of iterator */
                    if(temp_dim==0)
                        done=1;

                    /* Reset the block count in this dimension */
                    tmp_count[temp_dim]=diminfo[temp_dim].count;
                
                    /* Wrapped a dimension, go up to next dimension */
                    temp_dim--;
                } /* end while */
            } /* end if */

            /* Re-compute offset array */
            for(i=0; i<ndims; i++) {
                temp_off=diminfo[i].start+diminfo[i].stride*(diminfo[i].count-tmp_count[i]);
                offset[i]=temp_off;
            } /* end for */
        } /* end while */
    } /* end if */
    else {
        ret_value=H5S_hyper_span_blocklist(space->select.sel_info.hslab.span_lst,start,end,(hsize_t)0,&startblock,&numblocks,&buf);
    } /* end else */

    FUNC_LEAVE (ret_value);
}   /* H5S_get_select_hyper_blocklist() */


/*--------------------------------------------------------------------------
 NAME
    H5Sget_select_hyper_blocklist
 PURPOSE
    Get the list of hyperslab blocks currently selected
 USAGE
    herr_t H5Sget_select_hyper_blocklist(dsid, startblock, numblocks, buf)
        hid_t dsid;             IN: Dataspace ID of selection to query
        hsize_t startblock;     IN: Hyperslab block to start with
        hsize_t numblocks;      IN: Number of hyperslab blocks to get
        hsize_t *buf;           OUT: List of hyperslab blocks selected
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
        Puts a list of the hyperslab blocks into the user's buffer.  The blocks
    start with the 'startblock'th block in the list of blocks and put
    'numblocks' number of blocks into the user's buffer (or until the end of
    the list of blocks, whichever happen first)
        The block coordinates have the same dimensionality (rank) as the
    dataspace they are located within.  The list of blocks is formatted as
    follows: <"start" coordinate> immediately followed by <"opposite" corner
    coordinate>, followed by the next "start" and "opposite" coordinate, etc.
    until all the block information requested has been put into the user's
    buffer.
        No guarantee of any order of the blocks is implied.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5Sget_select_hyper_blocklist(hid_t spaceid, hsize_t startblock, hsize_t numblocks, hsize_t *buf)
{
    H5S_t	*space = NULL;      /* Dataspace to modify selection of */
    herr_t ret_value=FAIL;        /* return value */

    FUNC_ENTER (H5Sget_select_hyper_blocklist, FAIL);
    H5TRACE4("e","ihh*h",spaceid,startblock,numblocks,buf);

    /* Check args */
    if(buf==NULL)
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid pointer");
    if (H5I_DATASPACE != H5I_get_type(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }
    if(space->select.type!=H5S_SEL_HYPERSLABS)
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a hyperslab selection");

    /* Go get the correct number of blocks */
    if(numblocks>0)
        ret_value = H5S_get_select_hyper_blocklist(space,startblock,numblocks,buf);
    else
        ret_value=SUCCEED;      /* Successfully got 0 blocks... */

    FUNC_LEAVE (ret_value);
}   /* H5Sget_select_hyper_blocklist() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_elem_pointlist
 PURPOSE
    Get the list of element points currently selected
 USAGE
    herr_t H5S_get_select_elem_pointlist(space, hsize_t *buf)
        H5S_t *space;           IN: Dataspace pointer of selection to query
        hsize_t startpoint;     IN: Element point to start with
        hsize_t numpoints;      IN: Number of element points to get
        hsize_t *buf;           OUT: List of element points selected
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
        Puts a list of the element points into the user's buffer.  The points
    start with the 'startpoint'th block in the list of points and put
    'numpoints' number of points into the user's buffer (or until the end of
    the list of points, whichever happen first)
        The point coordinates have the same dimensionality (rank) as the
    dataspace they are located within.  The list of points is formatted as
    follows: <coordinate> followed by the next coordinate, etc. until all the
    point information in the selection have been put into the user's buffer.
        The points are returned in the order they will be interated through
    when a selection is read/written from/to disk.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5S_get_select_elem_pointlist(H5S_t *space, hsize_t startpoint, hsize_t numpoints, hsize_t *buf)
{
    H5S_pnt_node_t *node;       /* Point node */
    int rank;                  /* Dataspace rank */
    herr_t ret_value=SUCCEED;   /* return value */

    FUNC_ENTER_NOINIT(H5S_get_select_elem_pointlist);

    assert(space);
    assert(buf);

    /* Get the dataspace extent rank */
    rank=space->extent.u.simple.rank;

    /* Get the head of the point list */
    node=space->select.sel_info.pnt_lst->head;

    /* Iterate to the first point to return */
    while(node!=NULL && startpoint>0) {
        startpoint--;
        node=node->next;
      } /* end while */

    /* Iterate through the node, copying each hyperslab's information */
    while(node!=NULL && numpoints>0) {
        HDmemcpy(buf,node->pnt,sizeof(hsize_t)*rank);
        buf+=rank;
        numpoints--;
        node=node->next;
      } /* end while */

    FUNC_LEAVE (ret_value);
}   /* H5Sget_select_elem_pointlist() */


/*--------------------------------------------------------------------------
 NAME
    H5Sget_select_elem_pointlist
 PURPOSE
    Get the list of element points currently selected
 USAGE
    herr_t H5Sget_select_elem_pointlist(dsid, hsize_t *buf)
        hid_t dsid;             IN: Dataspace ID of selection to query
        hsize_t startpoint;     IN: Element point to start with
        hsize_t numpoints;      IN: Number of element points to get
        hsize_t *buf;           OUT: List of element points selected
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
        Puts a list of the element points into the user's buffer.  The points
    start with the 'startpoint'th block in the list of points and put
    'numpoints' number of points into the user's buffer (or until the end of
    the list of points, whichever happen first)
        The point coordinates have the same dimensionality (rank) as the
    dataspace they are located within.  The list of points is formatted as
    follows: <coordinate> followed by the next coordinate, etc. until all the
    point information in the selection have been put into the user's buffer.
        The points are returned in the order they will be interated through
    when a selection is read/written from/to disk.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5Sget_select_elem_pointlist(hid_t spaceid, hsize_t startpoint, hsize_t numpoints, hsize_t *buf)
{
    H5S_t	*space = NULL;      /* Dataspace to modify selection of */
    herr_t ret_value=FAIL;        /* return value */

    FUNC_ENTER (H5Sget_select_elem_pointlist, FAIL);
    H5TRACE4("e","ihh*h",spaceid,startpoint,numpoints,buf);

    /* Check args */
    if(buf==NULL)
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid pointer");
    if (H5I_DATASPACE != H5I_get_type(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }
    if(space->select.type!=H5S_SEL_POINTS)
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a point selection");

    ret_value = H5S_get_select_elem_pointlist(space,startpoint,numpoints,buf);

    FUNC_LEAVE (ret_value);
}   /* H5Sget_select_elem_pointlist() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_bounds
 PURPOSE
    Gets the bounding box containing the selection.
 USAGE
    herr_t H5S_get_select_bounds(space, hsize_t *start, hsize_t *end)
        H5S_t *space;           IN: Dataspace pointer of selection to query
        hsize_t *start;         OUT: Starting coordinate of bounding box
        hsize_t *end;           OUT: Opposite coordinate of bounding box
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
    Retrieves the bounding box containing the current selection and places
    it into the user's buffers.  The start and end buffers must be large
    enough to hold the dataspace rank number of coordinates.  The bounding box
    exactly contains the selection, ie. if a 2-D element selection is currently
    defined with the following points: (4,5), (6,8) (10,7), the bounding box
    with be (4, 5), (10, 8).  Calling this function on a "none" selection
    returns fail.
        The bounding box calculations _does_ include the current offset of the
    selection within the dataspace extent.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5S_get_select_bounds(H5S_t *space, hsize_t *start, hsize_t *end)
{
    int rank;                  /* Dataspace rank */
    int i;                     /* index variable */
    herr_t ret_value=FAIL;   /* return value */

    FUNC_ENTER_NOINIT(H5S_get_select_bounds);

    assert(space);
    assert(start);
    assert(end);

    /* Set the start and end arrays up */
    rank=space->extent.u.simple.rank;
    for(i=0; i<rank; i++) {
        start[i]=UINT_MAX;
        end[i]=0;
    } /* end for */

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_bounds(space,start,end);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_bounds(space,start,end);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=H5S_all_bounds(space,start,end);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_get_select_bounds() */


/*--------------------------------------------------------------------------
 NAME
    H5Sget_select_bounds
 PURPOSE
    Gets the bounding box containing the selection.
 USAGE
    herr_t H5S_get_select_bounds(space, start, end)
        hid_t dsid;             IN: Dataspace ID of selection to query
        hsize_t *start;         OUT: Starting coordinate of bounding box
        hsize_t *end;           OUT: Opposite coordinate of bounding box
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
    Retrieves the bounding box containing the current selection and places
    it into the user's buffers.  The start and end buffers must be large
    enough to hold the dataspace rank number of coordinates.  The bounding box
    exactly contains the selection, ie. if a 2-D element selection is currently
    defined with the following points: (4,5), (6,8) (10,7), the bounding box
    with be (4, 5), (10, 8).  Calling this function on a "none" selection
    returns fail.
        The bounding box calculations _does_ include the current offset of the
    selection within the dataspace extent.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5Sget_select_bounds(hid_t spaceid, hsize_t *start, hsize_t *end)
{
    H5S_t	*space = NULL;      /* Dataspace to modify selection of */
    herr_t ret_value=FAIL;        /* return value */

    FUNC_ENTER (H5Sget_select_bounds, FAIL);
    H5TRACE3("e","i*h*h",spaceid,start,end);

    /* Check args */
    if(start==NULL || end==NULL)
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid pointer");
    if (H5I_DATASPACE != H5I_get_type(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }

    ret_value = H5S_get_select_bounds(space,start,end);

    FUNC_LEAVE (ret_value);
}   /* H5Sget_select_bounds() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_contiguous
 PURPOSE
    Check if the selection is contiguous within the dataspace extent.
 USAGE
    htri_t H5S_select_contiguous(space)
        H5S_t *space;           IN: Dataspace pointer to check
 RETURNS
    TRUE/FALSE/FAIL
 DESCRIPTION
    Checks to see if the current selection in the dataspace is contiguous.
    This is primarily used for reading the entire selection in one swoop.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_contiguous(const H5S_t *space)
{
    htri_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_select_contiguous, FAIL);

    assert(space);

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_contiguous(space);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_contiguous(space);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=TRUE;
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=FALSE;
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_select_contiguous() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_iterate
 PURPOSE
    Iterate over the selected elements in a memory buffer.
 USAGE
    herr_t H5S_select_iterate(buf, type_id, space, operator, operator_data)
        void *buf;      IN/OUT: Buffer containing elements to iterate over
        hid_t type_id;  IN: Datatype ID of BUF array.
        H5S_t *space;   IN: Dataspace object containing selection to iterate over
        H5D_operator_t op; IN: Function pointer to the routine to be
                                called for each element in BUF iterated over.
        void *operator_data;    IN/OUT: Pointer to any user-defined data
                                associated with the operation.
 RETURNS
    Returns the return value of the last operator if it was non-zero, or zero
    if all elements were processed. Otherwise returns a negative value.
 DESCRIPTION
    Iterates over the selected elements in a memory buffer, calling the user's
    callback function for each element.  The selection in the dataspace is
    modified so that any elements already iterated over are removed from the
    selection if the iteration is interrupted (by the H5D_operator_t function
    returning non-zero) in the "middle" of the iteration and may be re-started
    by the user where it left off.

    NOTE: Until "subtracting" elements from a selection is implemented,
        the selection is not modified.
--------------------------------------------------------------------------*/
herr_t
H5S_select_iterate(void *buf, hid_t type_id, H5S_t *space, H5D_operator_t op,
        void *operator_data)
{
    herr_t ret_value=FAIL;

    FUNC_ENTER(H5S_select_iterate, FAIL);

    /* Check args */
    assert(buf);
    assert(space);
    assert(op);
    assert(H5I_DATATYPE == H5I_get_type(type_id));

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_iterate(buf,type_id,space,op,operator_data);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_iterate(buf,type_id,space,op,operator_data);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=H5S_all_select_iterate(buf,type_id,space,op,operator_data);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=H5S_none_select_iterate(buf,type_id,space,op,operator_data);
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE(ret_value);
}   /* end H5S_select_iterate() */


/*--------------------------------------------------------------------------
 NAME
    H5Sget_select_type
 PURPOSE
    Retrieve the type of selection in a dataspace
 USAGE
    H5S_sel_type H5Sget_select_type(space_id)
        hid_t space_id;	        IN: Dataspace object to reset
 RETURNS
    Non-negative on success/Negative on failure.  Return value is from the
    set of values in the H5S_sel_type enumerated type.
 DESCRIPTION
	This function retrieves the type of selection currently defined for
    a dataspace.
--------------------------------------------------------------------------*/
H5S_sel_type
H5Sget_select_type(hid_t space_id)
{
    H5S_t		   *space = NULL;	/* dataspace to modify */

    FUNC_ENTER(H5Sget_select_type, H5S_SEL_ERROR);
    H5TRACE1("St","i",space_id);

    /* Check args */
    if (H5I_DATASPACE != H5I_get_type(space_id) || NULL == (space = H5I_object(space_id)))
        HRETURN_ERROR(H5E_ATOM, H5E_BADATOM, H5S_SEL_ERROR, "not a data space");

    FUNC_LEAVE(space->select.type);
}   /* end H5Sget_select_type() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_single
 PURPOSE
    Check if the selection is a single block within the dataspace extent.
 USAGE
    htri_t H5S_select_single(space)
        H5S_t *space;           IN: Dataspace pointer to check
 RETURNS
    TRUE/FALSE/FAIL
 DESCRIPTION
    Checks to see if the current selection in the dataspace is a single block.
    This is primarily used for reading the entire selection in one swoop.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_single(const H5S_t *space)
{
    htri_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_select_single, FAIL);

    /* Check args */
    assert(space);

    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_single(space);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_single(space);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=TRUE;
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=FALSE;
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_select_single() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_shape_same
 PURPOSE
    Check if two selections are the same shape
 USAGE
    htri_t H5S_select_shape_same(space1, space2)
        const H5S_t *space1;         IN: 1st Dataspace pointer to compare
        const H5S_t *space2;         IN: 2nd Dataspace pointer to compare
 RETURNS
    TRUE/FALSE/FAIL
 DESCRIPTION
    Checks to see if the current selection in the dataspaces are the same
    dimensionality and shape.
    This is primarily used for reading the entire selection in one swoop.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    Assumes that there is only a single "block" for hyperslab selections.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_shape_same(const H5S_t *space1, const H5S_t *space2)
{
    H5S_hyper_span_t *span1=NULL,*span2=NULL;   /* Hyperslab span node */
    hsize_t	elmts1,elmts2;                  /* Number of elements in each dimension of selection */
    unsigned	u;                              /* Index variable */
    htri_t ret_value=TRUE;  /* return value */

    FUNC_ENTER (H5S_select_shape_same, FAIL);

    /* Check args */
    assert(space1);
    assert(space2);

    if (space1->extent.u.simple.rank!=space2->extent.u.simple.rank)
        HGOTO_DONE(FALSE);

    /* Get information about memory and file */
    for (u=0; u<space1->extent.u.simple.rank; u++) {
        switch(space1->select.type) {
            case H5S_SEL_HYPERSLABS:
                /* Check size hyperslab selection in this dimension */
                if(space1->select.sel_info.hslab.diminfo != NULL) {
                    elmts1=space1->select.sel_info.hslab.diminfo[u].block;
                } /* end if */
                else {
                    /* Check for the first dimension */
                    if(span1==NULL)
                        span1=space1->select.sel_info.hslab.span_lst->head;

                    /* Get the number of elements in the span */
                    elmts1=(span1->high-span1->low)+1;

                    /* Advance to the next dimension */
                    span1=span1->down->head;
                } /* end else */
                break;

            case H5S_SEL_ALL:
                elmts1=space1->extent.u.simple.size[u];
                break;

            case H5S_SEL_POINTS:
                elmts1=1;
                break;

            default:
                assert(0 && "Invalid selection type!");
        } /* end switch */

        switch(space2->select.type) {
            case H5S_SEL_HYPERSLABS:
                /* Check size hyperslab selection in this dimension */
                if(space2->select.sel_info.hslab.diminfo != NULL) {
                    elmts2=space2->select.sel_info.hslab.diminfo[u].block;
                } /* end if */
                else {
                    /* Check for the first dimension */
                    if(span2==NULL)
                        span2=space2->select.sel_info.hslab.span_lst->head;

                    /* Get the number of elements in the span */
                    elmts2=(span2->high-span2->low)+1;

                    /* Advance to the next dimension */
                    span2=span2->down->head;
                } /* end else */
                break;

            case H5S_SEL_ALL:
                elmts2=space2->extent.u.simple.size[u];
                break;

            case H5S_SEL_POINTS:
                elmts2=1;
                break;

            default:
                assert(0 && "Invalid selection type!");
        } /* end switch */

        /* Make certaint the selections have the same number of elements in this dimension */
        if (elmts1!=elmts2)
            HGOTO_DONE(FALSE);
    } /* end for */

done:
    FUNC_LEAVE (ret_value);
}   /* H5S_select_shape_same() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_regular
 PURPOSE
    Check if a selection is "regular"
 USAGE
    htri_t H5S_select_regular(space)
        const H5S_t *space;     IN: Dataspace pointer to check
 RETURNS
    TRUE/FALSE/FAIL
 DESCRIPTION
    Checks to see if the current selection in a dataspace is the a regular
    pattern.
    This is primarily used for reading the entire selection in one swoop.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_regular(const H5S_t *space)
{
    htri_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_select_regular, FAIL);

    /* Check args */
    assert(space);

    /* Check for a "regular" selection */
    /* [Defer (mostly) to the selection routines] */
    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_regular(space);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_regular(space);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=TRUE;
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=FALSE;
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            break;
    } /* end switch */

    FUNC_LEAVE (ret_value);
}   /* H5S_select_regular() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_fill
 PURPOSE
    Fill a selection in memory with a value
 USAGE
    herr_t H5S_select_fill(fill,fill_size,space,buf)
        const void *fill;       IN: Pointer to fill value to use
        size_t fill_size;       IN: Size of elements in memory buffer & size of
                                    fill value
        H5S_t *space;           IN: Dataspace describing memory buffer &
                                    containing selection to use.
        void *buf;              IN/OUT: Memory buffer to fill selection in
 RETURNS
    Non-negative on success/Negative on failure.
 DESCRIPTION
    Use the selection in the dataspace to fill elements in a memory buffer.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    The memory buffer elements are assumed to have the same datatype as the
    fill value being placed into them.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_fill(void *_fill, size_t fill_size, const H5S_t *space, void *buf)
{
    void *fill=_fill;           /* Alias for fill-value buffer */
    herr_t ret_value=FAIL;      /* return value */

    FUNC_ENTER (H5S_select_fill, FAIL);

    /* Check args */
    assert(fill_size>0);
    assert(space);
    assert(buf);

    /* Check if we need a temporary fill value buffer */
    if(fill==NULL) {
        if (NULL==(fill = H5MM_calloc(fill_size)))
            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "fill value buffer allocation failed");
    } /* end if */

    /* Fill the selection in the memory buffer */
    /* [Defer (mostly) to the selection routines] */
    switch(space->select.type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value=H5S_point_select_fill(fill,fill_size,space,buf);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value=H5S_hyper_select_fill(fill,fill_size,space,buf);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value=H5S_all_select_fill(fill,fill_size,space,buf);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value=SUCCEED;
            break;

        case H5S_SEL_ERROR:
        case H5S_SEL_N:
            assert(0 && "Invalid selection type!");
            break;
    } /* end switch */

done:
    if(_fill==NULL && fill)
        H5MM_xfree(fill);

    FUNC_LEAVE (ret_value);
}   /* H5S_select_fill() */