summaryrefslogtreecommitdiffstats
path: root/src/H5Sselect.c
blob: 80b5ea1e55fe319ddca2f0105e307b567863b394 (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
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/* Programmer:  Quincey Koziol <koziol@ncsa.uiuc.ued>
 *              Friday, May 29, 1998
 *
 * Purpose:	Dataspace selection functions.
 */

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

#include "H5Smodule.h"          /* This source code file is part of the H5S module */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Dprivate.h"		/* Datasets				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free Lists                           */
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5Spkg.h"		/* Dataspaces 				*/
#include "H5VMprivate.h"	/* Vector and array functions		*/


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



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


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

#ifdef LATER
static herr_t H5S_select_iter_block(const H5S_sel_iter_t *iter, hsize_t *start, hsize_t *end);
static htri_t H5S_select_iter_has_next_block(const H5S_sel_iter_t *iter);
static herr_t H5S_select_iter_next_block(H5S_sel_iter_t *iter);
#endif /* LATER */


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


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

/* Declare a free list to manage the H5S_sel_iter_t struct */
H5FL_DEFINE(H5S_sel_iter_t);

/* Declare extern free list to manage sequences of size_t */
H5FL_SEQ_EXTERN(size_t);

/* Declare extern free list to manage sequences of hsize_t */
H5FL_SEQ_EXTERN(hsize_t);


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



/*--------------------------------------------------------------------------
 NAME
    H5S_select_offset
 PURPOSE
    Set the selection offset for a datapace
 USAGE
    herr_t H5S_select_offset(space, offset)
        H5S_t *space;	        IN/OUT: Dataspace object to set selection offset
        const hssize_t *offset; IN: Offset to position the selection at
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Sets the selection offset for the dataspace
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    Only works for simple dataspaces currently
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_offset(H5S_t *space, const hssize_t *offset)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);
    HDassert(0 < space->extent.rank && space->extent.rank <= H5S_MAX_RANK);
    HDassert(offset);

    /* Copy the offset over */
    H5MM_memcpy(space->select.offset, offset, sizeof(hssize_t) * space->extent.rank);

    /* Indicate that the offset was changed */
    space->select.offset_changed = TRUE;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5S_select_offset() */


/*--------------------------------------------------------------------------
 NAME
    H5Soffset_simple
 PURPOSE
    Changes the offset of a selection within a simple dataspace extent
 USAGE
    herr_t H5Soffset_simple(space_id, offset)
        hid_t space_id;	        IN: Dataspace object to reset
        const hssize_t *offset; IN: Offset to position the selection at
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
	This function creates an offset for the selection within an extent, allowing
    the same shaped selection to be moved to different locations within a
    dataspace without requiring it to be re-defined.
--------------------------------------------------------------------------*/
herr_t
H5Soffset_simple(hid_t space_id, const hssize_t *offset)
{
    H5S_t *space;	        /* Dataspace to query */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE2("e", "i*Hs", space_id, offset);

    /* Check args */
    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "not a dataspace")
    if(space->extent.rank == 0 || (H5S_GET_EXTENT_TYPE(space) == H5S_SCALAR
            || H5S_GET_EXTENT_TYPE(space) == H5S_NULL))
        HGOTO_ERROR(H5E_ATOM, H5E_UNSUPPORTED, FAIL, "can't set offset on scalar or null dataspace")
    if(offset == NULL)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no offset specified")

    /* Set the selection offset */
    if(H5S_select_offset(space, offset) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "can't set offset")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Soffset_simple() */


/*--------------------------------------------------------------------------
 NAME
    H5Sselect_copy
 PURPOSE
    Copy a selection from one dataspace to another
 USAGE
    herr_t H5Sselect_copy(dst, src)
        hid_t   dst;              OUT: ID of the destination dataspace
        hid_t   src;              IN:  ID of the source dataspace

 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Copies all the selection information (including offset) from the source
    dataspace to the destination dataspace.

 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5Sselect_copy(hid_t dst_id, hid_t src_id)
{
    H5S_t  *src;
    H5S_t  *dst;
    herr_t  ret_value = SUCCEED;

    FUNC_ENTER_API(FAIL)
    H5TRACE2("e", "ii", dst_id, src_id);

    /* Check args */
    if(NULL == (src = (H5S_t *)H5I_object_verify(src_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")
    if(NULL == (dst = (H5S_t *)H5I_object_verify(dst_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")

    /* Copy */
    if(H5S_select_copy(dst, src, FALSE) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't copy selection")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Sselect_copy() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_copy
 PURPOSE
    Copy a selection from one dataspace to another
 USAGE
    herr_t H5S_select_copy(dst, src, share_selection)
        H5S_t *dst;  OUT: Pointer to the destination dataspace
        H5S_t *src;  IN: Pointer to the source dataspace
        hbool_t;     IN: Whether to share the selection between the dataspaces
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Copies all the selection information (include offset) from the source
    dataspace to the destination dataspace.

    If the SHARE_SELECTION flag is set, then the selection can be shared
    between the source and destination dataspaces.  (This should only occur in
    situations where the destination dataspace will immediately change to a new
    selection)
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_copy(H5S_t *dst, const H5S_t *src, hbool_t share_selection)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

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

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

    /* Perform correct type of copy based on the type of selection */
    if((ret_value = (*src->select.type->copy)(dst,src,share_selection)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't copy selection specific information")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_copy() */


/*-------------------------------------------------------------------------
 * Function:	H5S_select_release
 *
 * Purpose:	Releases all memory associated with a dataspace selection.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Friday, May 30, 2003
 *
 * Note: This routine participates in the "Inlining C function pointers"
 *      pattern, don't call it directly, use the appropriate macro
 *      defined in H5Sprivate.h.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5S_select_release(H5S_t *ds)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    HDassert(ds);

    /* Call the selection type's release function */
    if((ds->select.type) && ((ret_value = (*ds->select.type->release)(ds)) < 0))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_release() */


/*-------------------------------------------------------------------------
 * Function:	H5S_select_serial_size
 *
 * Purpose:	Determines the number of bytes required to store the current
 *              selection
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Tuesday, May 18, 2004
 *
 * Note: This routine participates in the "Inlining C function pointers"
 *      pattern, don't call it directly, use the appropriate macro
 *      defined in H5Sprivate.h.
 *
 *-------------------------------------------------------------------------
 */
hssize_t
H5S_select_serial_size(const H5S_t *space)
{
    hssize_t ret_value = -1;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    HDassert(space);

    /* Call the selection type's serial_size function */
    ret_value = (*space->select.type->serial_size)(space);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_serial_size() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_serialize
 PURPOSE
    Serialize the selection for a dataspace into a buffer
 USAGE
    herr_t H5S_select_serialize(space, p)
        const H5S_t *space;     IN: Dataspace with selection to serialize
        uint8_t **p;            OUT: Pointer to buffer to put serialized
                                selection.  Will be advanced to end of
                                serialized selection.
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Calls the appropriate dataspace selection callback to serialize the
    current selection into a buffer.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_serialize(const H5S_t *space, uint8_t **p)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    HDassert(space);
    HDassert(p);

    /* Call the selection type's serialize function */
    ret_value = (*space->select.type->serialize)(space, p);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_serialize() */


/*--------------------------------------------------------------------------
 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
    Non-negative on success/Negative 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;               /* Dataspace to modify selection of */
    hssize_t ret_value;         /* return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("Hs", "i", spaceid);

    /* Check args */
    if(NULL == (space = (H5S_t *)H5I_object_verify(spaceid, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")

    ret_value = (hssize_t)H5S_GET_SELECT_NPOINTS(space);

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Sget_select_npoints() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_npoints
 PURPOSE
    Get the number of elements in current selection
 USAGE
    hssize_t H5Sget_select_npoints(space)
        H5S_t *space;             IN: Dataspace 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
     This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
H5_ATTR_PURE hssize_t
H5S_get_select_npoints(const H5S_t *space)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);

    FUNC_LEAVE_NOAPI((hssize_t)space->select.num_elem)
} /* end H5S_get_select_npoints() */


/*--------------------------------------------------------------------------
 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 offset 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;       /* Dataspace to modify selection of */
    htri_t ret_value;   /* return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("t", "i", spaceid);

    /* Check args */
    if(NULL == (space = (H5S_t *)H5I_object_verify(spaceid, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")

    ret_value = H5S_SELECT_VALID(space);

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Sselect_valid() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_valid
 PURPOSE
    Check whether the selection fits within the extent, with the current
    offset defined.
 USAGE
    htri_t H5S_select_void(space)
        H5S_t *space;           IN: Dataspace 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 offset fits within the
    extent for the dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
     This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_valid(const H5S_t *space)
{
    htri_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    HDassert(space);

    ret_value = (*space->select.type->is_valid)(space);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_valid() */


/*--------------------------------------------------------------------------
 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, p)
        H5S_t **space;          IN/OUT: Dataspace pointer to place
                                selection into.  Will be allocated if not
                                provided.
        uint8 **p;              OUT: Pointer to buffer holding serialized
                                selection.  Will be advanced to end of
                                serialized selection.
 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 **p)
{
    uint32_t sel_type;          /* Pointer to the selection type */
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(space);

    /* Selection-type specific coding is moved to the callbacks. */

    /* Decode selection type */
    UINT32DECODE(*p, sel_type);

    /* Make routine for selection type */
    switch(sel_type) {
        case H5S_SEL_POINTS:         /* Sequence of points selected */
            ret_value = (*H5S_sel_point->deserialize)(space, p);
            break;

        case H5S_SEL_HYPERSLABS:     /* Hyperslab selection defined */
            ret_value = (*H5S_sel_hyper->deserialize)(space, p);
            break;

        case H5S_SEL_ALL:            /* Entire extent selected */
            ret_value = (*H5S_sel_all->deserialize)(space, p);
            break;

        case H5S_SEL_NONE:           /* Nothing selected */
            ret_value = (*H5S_sel_none->deserialize)(space, p);
            break;

        default:
            break;
    } /* end switch */

    if(ret_value < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTLOAD, FAIL, "can't deserialize selection")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_deserialize() */


/*--------------------------------------------------------------------------
 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
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5Sget_select_bounds(hid_t spaceid, hsize_t start[], hsize_t end[])
{
    H5S_t *space;       /* Dataspace to modify selection of */
    herr_t ret_value;   /* return value */

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

    /* Check args */
    if(start == NULL || end == NULL)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid pointer")
    if(NULL == (space = (H5S_t *)H5I_object_verify(spaceid, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")

    ret_value = H5S_SELECT_BOUNDS(space, start, end);

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Sget_select_bounds() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_bounds
 PURPOSE
    Gets the bounding box containing the selection.
 USAGE
    herr_t H5S_get_select_bounds(space, start, end)
        H5S_t *space;           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
H5S_get_select_bounds(const H5S_t *space, hsize_t *start, hsize_t *end)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);
    HDassert(start);
    HDassert(end);

    ret_value = (*space->select.type->bounds)(space, start, end);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_get_select_bounds() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_offset
 PURPOSE
    Gets the linear offset of the first element for the selection.
 USAGE
    herr_t H5S_get_select_offset(space, offset)
        const H5S_t *space;     IN: Dataspace pointer of selection to query
        hsize_t *offset;        OUT: Linear offset of first element in selection
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
    Retrieves the linear offset (in "units" of elements) of the first element
    selected within the dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
        The offset calculation _does_ include the current offset of the
    selection within the dataspace extent.

        Calling this function on a "none" selection returns fail.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_get_select_offset(const H5S_t *space, hsize_t *offset)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);
    HDassert(offset);

    ret_value = (*space->select.type->offset)(space, offset);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_get_select_offset() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_unlim_dim
 PURPOSE
    Gets the unlimited dimension in the selection, or -1 if there is no
    unlimited dimension.
 USAGE
    int H5S_get_select_unlim_dim(space)
        const H5S_t *space;     IN: Dataspace pointer of selection to query
 RETURNS
    Unlimited dimension in the selection, or -1 if there is no unlimited
    dimension (never fails)
 DESCRIPTION
    Gets the unlimited dimension in the selection, or -1 if there is no
    unlimited dimension.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
        Currently only implemented for hyperslab selections, all others
        simply return -1.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
int
H5S_get_select_unlim_dim(const H5S_t *space)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);

    ret_value = (*space->select.type->unlim_dim)(space);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_get_select_unlim_dim() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_num_elem_non_unlim
 PURPOSE
    Gets the number of elements in the non-unlimited dimensions
 USAGE
    herr_t H5S_get_select_num_elem_non_unlim(space,num_elem_non_unlim)
        H5S_t *space;           IN: Dataspace pointer to check
        hsize_t *num_elem_non_unlim; OUT: Number of elements in the non-unlimited dimensions
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    Returns the number of elements in a slice through the non-unlimited
    dimensions of the selection.  Fails if the selection has no unlimited
    dimension.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_get_select_num_elem_non_unlim(const H5S_t *space,
    hsize_t *num_elem_non_unlim)
{
    herr_t ret_value = SUCCEED; /* return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Check args */
    HDassert(space);
    HDassert(num_elem_non_unlim);

    /* Check for selection callback */
    if(!space->select.type->num_elem_non_unlim)
        HGOTO_ERROR(H5E_DATASPACE, H5E_UNSUPPORTED, FAIL, "selection type has no num_elem_non_unlim callback")

    /* Make selection callback */
    if((*space->select.type->num_elem_non_unlim)(space, num_elem_non_unlim) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't get number of elements in non-unlimited dimension")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_get_select_unlim_dim() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_is_contiguous
 PURPOSE
    Determines if a selection is contiguous in the dataspace
 USAGE
    htri_t H5S_select_is_contiguous(space)
        const H5S_t *space;             IN: Dataspace of selection to query
 RETURNS
    Non-negative (TRUE/FALSE) on success, negative on failure
 DESCRIPTION
    Checks the selection to determine if the points to iterated over will be
    contiguous in the particular dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_is_contiguous(const H5S_t *space)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);

    ret_value = (*space->select.type->is_contiguous)(space);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_is_contiguous() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_is_single
 PURPOSE
    Determines if a selection is a single block in the dataspace
 USAGE
    htri_t H5S_select_is_single(space)
        const H5S_t *space;             IN: Dataspace of selection to query
 RETURNS
    Non-negative (TRUE/FALSE) on success, negative on failure
 DESCRIPTION
    Checks the selection to determine if it occupies a single block in the
    particular dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_is_single(const H5S_t *space)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);

    ret_value = (*space->select.type->is_single)(space);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_is_single() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_is_regular
 PURPOSE
    Determines if a selection is "regular"  in the dataspace
 USAGE
    htri_t H5S_select_is_regular(space)
        const H5S_t *space;             IN: Dataspace of selection to query
 RETURNS
    Non-negative (TRUE/FALSE) on success, negative on failure
 DESCRIPTION
    Checks the selection to determine if it is "regular" (i.e. a single
    block or a strided pattern) in the particular dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_is_regular(const H5S_t *space)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);

    ret_value = (*space->select.type->is_regular)(space);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_is_regular() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_adjust_u
 PURPOSE
    Adjust a selection by subtracting an offset
 USAGE
    herr_t H5S_select_adjust_u(space, offset)
        H5S_t *space;           IN/OUT: Pointer to dataspace to adjust
        const hsize_t *offset; IN: Offset to subtract
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
    Moves a selection by subtracting an offset from it.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_adjust_u(H5S_t *space, const hsize_t *offset)
{
    hbool_t non_zero_offset = FALSE;    /* Whether any offset is non-zero */
    unsigned u;                         /* Local index variable */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);
    HDassert(offset);

    /* Check for an all-zero offset vector */
    for(u = 0; u < space->extent.rank; u++)
        if(0 != offset[u]) {
            non_zero_offset = TRUE;
            break;
        } /* end if */

    /* Only perform operation if the offset is non-zero */
    if(non_zero_offset)
        ret_value = (*space->select.type->adjust_u)(space, offset);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_adjust_u() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_project_scalar
 PURPOSE
    Project a single element selection for a scalar dataspace
 USAGE
    herr_t H5S_select_project_scalar(space, offset)
        const H5S_t *space;             IN: Pointer to dataspace to project
        hsize_t *offset;                IN/OUT: Offset of projected point
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
    Projects a selection of a single element into a scalar dataspace, computing
    the offset of the element in the original selection.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_project_scalar(const H5S_t *space, hsize_t *offset)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);
    HDassert(offset);

    ret_value = (*space->select.type->project_scalar)(space, offset);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_project_scalar() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_project_simple
 PURPOSE
    Project a selection onto/into a dataspace of different rank
 USAGE
    herr_t H5S_select_project_simple(space, new_space, offset)
        const H5S_t *space;             IN: Pointer to dataspace to project
        H5S_t *new_space;               IN/OUT: Pointer to dataspace projected onto
        hsize_t *offset;                IN/OUT: Offset of projected point
 RETURNS
    Non-negative on success, negative on failure
 DESCRIPTION
    Projects a selection onto/into a simple dataspace, computing
    the offset of the first element in the original selection.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_project_simple(const H5S_t *space, H5S_t *new_space, hsize_t *offset)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);
    HDassert(new_space);
    HDassert(offset);

    ret_value = (*space->select.type->project_simple)(space, new_space, offset);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_project_simple() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_iter_init
 PURPOSE
    Initializes iteration information for a selection.
 USAGE
    herr_t H5S_select_iter_init(sel_iter, space, elmt_size, flags)
        H5S_sel_iter_t *sel_iter; OUT: Selection iterator to initialize.
        H5S_t *space;           IN: Dataspace object containing selection to
                                    iterate over
        size_t elmt_size;       IN: Size of elements in the selection
        unsigned flags;         IN: Flags to control iteration behavior
 RETURNS
     Non-negative on success, negative on failure.
 DESCRIPTION
    Initialize the selection iterator object to point to the first element
    in the dataspace's selection.
--------------------------------------------------------------------------*/
herr_t
H5S_select_iter_init(H5S_sel_iter_t *sel_iter, const H5S_t *space,
    size_t elmt_size, unsigned flags)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(sel_iter);
    HDassert(space);

    /* Initialize common information */

    /* Save the dataspace's rank */
    sel_iter->rank = space->extent.rank;

    /* If dims > 0, copy the dataspace dimensions & selection offset */
    if(sel_iter->rank > 0) {
        H5MM_memcpy(sel_iter->dims, space->extent.size, sizeof(hsize_t) * space->extent.rank);
        H5MM_memcpy(sel_iter->sel_off, space->select.offset, sizeof(hsize_t) * space->extent.rank);
    } /* end if */

    /* Save the element size */
    sel_iter->elmt_size = elmt_size;

    /* Initialize the number of elements to iterate over */
    sel_iter->elmt_left = space->select.num_elem;

    /* Set the flags for the iterator */
    sel_iter->flags = flags;

    /* Call initialization routine for selection type */
    ret_value = (*space->select.type->iter_init)(space, sel_iter);
    HDassert(sel_iter->type);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_init() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_iter_coords
 PURPOSE
    Get the coordinates of the current iterator position
 USAGE
    herr_t H5S_select_iter_coords(sel_iter,coords)
        H5S_sel_iter_t *sel_iter; IN: Selection iterator to query
        hsize_t *coords;         OUT: Array to place iterator coordinates in
 RETURNS
    Non-negative on success, negative on failure.
 DESCRIPTION
    The current location of the iterator within the selection is placed in
    the COORDS array.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_iter_coords(const H5S_sel_iter_t *sel_iter, hsize_t *coords)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(sel_iter);
    HDassert(coords);

    /* Call iter_coords routine for selection type */
    ret_value = (*sel_iter->type->iter_coords)(sel_iter, coords);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_coords() */

#ifdef LATER

/*--------------------------------------------------------------------------
 NAME
    H5S_select_iter_block
 PURPOSE
    Get the block of the current iterator position
 USAGE
    herr_t H5S_select_iter_block(sel_iter,start,end)
        const H5S_sel_iter_t *sel_iter; IN: Selection iterator to query
        hsize_t *start;    OUT: Array to place iterator start block coordinates
        hsize_t *end;      OUT: Array to place iterator end block coordinates
 RETURNS
    Non-negative on success, negative on failure.
 DESCRIPTION
    The current location of the iterator within the selection is placed in
    the COORDS array.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5S_select_iter_block(const H5S_sel_iter_t *iter, hsize_t *start, hsize_t *end)
{
    herr_t ret_value;         /* return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(iter);
    HDassert(start);
    HDassert(end);

    /* Call iter_block routine for selection type */
    ret_value = (*iter->type->iter_block)(iter, start, end);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_block() */
#endif /* LATER */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_iter_nelmts
 PURPOSE
    Get the number of elements left to iterate over in selection
 USAGE
    hssize_t H5S_select_iter_nelmts(sel_iter)
        H5S_sel_iter_t *sel_iter; IN: Selection iterator 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
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
hsize_t
H5S_select_iter_nelmts(const H5S_sel_iter_t *sel_iter)
{
    hsize_t ret_value = 0;      /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(sel_iter);

    /* Call iter_nelmts routine for selection type */
    ret_value = (*sel_iter->type->iter_nelmts)(sel_iter);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_nelmts() */

#ifdef LATER

/*--------------------------------------------------------------------------
 NAME
    H5S_select_iter_has_next_block
 PURPOSE
    Check if there is another block available in the selection iterator
 USAGE
    htri_t H5S_select_iter_has_next_block(sel_iter)
        const H5S_sel_iter_t *sel_iter; IN: Selection iterator to query
 RETURNS
    Non-negative on success, negative on failure.
 DESCRIPTION
    Check if there is another block available to advance to in the selection
    iterator.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static htri_t
H5S_select_iter_has_next_block(const H5S_sel_iter_t *iter)
{
    herr_t ret_value;         /* return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(iter);

    /* Call iter_has_next_block routine for selection type */
    ret_value = (*iter->type->iter_has_next_block)(iter);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_has_next_block() */
#endif /* LATER */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_iter_next
 PURPOSE
    Advance selection iterator to next element
 USAGE
    herr_t H5S_select_iter_next(iter, nelem)
        H5S_sel_iter_t *iter;   IN/OUT: Selection iterator to change
        size_t nelem;           IN: Number of elements to advance by
 RETURNS
    Non-negative on success, negative on failure.
 DESCRIPTION
    Move the current element for the selection iterator to the NELEM'th next
    element in the selection.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_iter_next(H5S_sel_iter_t *iter, size_t nelem)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(iter);
    HDassert(nelem>0);

    /* Call iter_next routine for selection type */
    ret_value = (*iter->type->iter_next)(iter, nelem);

    /* Decrement the number of elements left in selection */
    iter->elmt_left-=nelem;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_next() */

#ifdef LATER

/*--------------------------------------------------------------------------
 NAME
    H5S_select_iter_next_block
 PURPOSE
    Advance selection iterator to next block
 USAGE
    herr_t H5S_select_iter_next_block(iter)
        H5S_sel_iter_t *iter;   IN/OUT: Selection iterator to change
 RETURNS
    Non-negative on success, negative on failure.
 DESCRIPTION
    Move the current element for the selection iterator to the next
    block in the selection.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    Doesn't maintain the 'elmt_left' field of the selection iterator.

    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5S_select_iter_next_block(H5S_sel_iter_t *iter)
{
    herr_t ret_value;         /* return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(iter);

    /* Call iter_next_block routine for selection type */
    ret_value = (*iter->type->iter_next_block)(iter);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_next_block() */
#endif /* LATER */


/*-------------------------------------------------------------------------
 * Function:	H5S_select_iter_get_seq_list
 *
 * Purpose:	Retrieves the next sequence of offset/length pairs for an
 *              iterator on a dataspace
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Tuesday, May 18, 2004
 *
 * Note: This routine participates in the "Inlining C function pointers"
 *      pattern, don't call it directly, use the appropriate macro
 *      defined in H5Sprivate.h.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5S_select_iter_get_seq_list(H5S_sel_iter_t *iter, size_t maxseq, size_t maxelmts,
    size_t *nseq, size_t *nelmts, hsize_t *off, size_t *len)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity check */
    HDassert(iter);

    /* Call the selection type's get_seq_list function */
    if((ret_value = (*iter->type->iter_get_seq_list)(iter, maxseq, maxelmts, nseq, nelmts, off, len)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get selection sequence list")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_get_seq_list() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_iter_release
 PURPOSE
    Release a selection iterator's resources.
 USAGE
    hssize_t H5S_select_iter_release(sel_iter)
        H5S_sel_iter_t *sel_iter; IN: Selection iterator 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
    This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_iter_release(H5S_sel_iter_t *sel_iter)
{
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(sel_iter);

    /* Call selection type-specific release routine */
    ret_value = (*sel_iter->type->iter_release)(sel_iter);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_iter_release() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_iterate
 PURPOSE
    Iterate over the selected elements in a memory buffer.
 USAGE
    herr_t H5S_select_iterate(buf, type, space, operator, operator_data)
        void *buf;      IN/OUT: Buffer containing elements to iterate over
        H5T_t *type;    IN: Datatype 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, const H5T_t *type, const H5S_t *space,
    const H5S_sel_iter_op_t *op, void *op_data)
{
    H5S_sel_iter_t *iter = NULL; /* Selection iteration info */
    hbool_t iter_init = FALSE;  /* Selection iteration info has been initialized */
    hsize_t *off = NULL;        /* Array to store sequence offsets */
    size_t *len = NULL;         /* Array to store sequence lengths */
    hssize_t nelmts;            /* Number of elements in selection */
    hsize_t space_size[H5S_MAX_RANK]; /* Dataspace size */
    size_t max_elem;            /* Maximum number of elements allowed in sequences */
    size_t elmt_size;           /* Datatype size */
    unsigned ndims;             /* Number of dimensions in dataspace */
    herr_t user_ret = 0;        /* User's return value */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Check args */
    HDassert(buf);
    HDassert(type);
    HDassert(space);
    HDassert(op);

    /* Get the datatype size */
    if(0 == (elmt_size = H5T_get_size(type)))
        HGOTO_ERROR(H5E_DATATYPE, H5E_BADSIZE, FAIL, "datatype size invalid")

    /* Allocate the selection iterator */
    if(NULL == (iter = H5FL_MALLOC(H5S_sel_iter_t)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate selection iterator")

    /* Initialize iterator */
    if(H5S_select_iter_init(iter, space, elmt_size, 0) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator")
    iter_init = TRUE;	/* Selection iteration info has been initialized */

    /* Get the number of elements in selection */
    if((nelmts = (hssize_t)H5S_GET_SELECT_NPOINTS(space)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't get number of elements selected")

    /* Get the rank of the dataspace */
    ndims = space->extent.rank;

    if(ndims > 0) {
	/* Copy the size of the space */
	HDassert(space->extent.size);
	H5MM_memcpy(space_size, space->extent.size, ndims * sizeof(hsize_t));
    } /* end if */
    space_size[ndims] = elmt_size;

    /* Compute the maximum number of bytes required */
    H5_CHECKED_ASSIGN(max_elem, size_t, nelmts, hssize_t);

    /* Allocate the offset & length arrays */
    if(NULL == (len = H5FL_SEQ_MALLOC(size_t, H5D_IO_VECTOR_SIZE)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate length vector array")
    if(NULL == (off = H5FL_SEQ_MALLOC(hsize_t, H5D_IO_VECTOR_SIZE)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate offset vector array")

    /* Loop, while elements left in selection */
    while(max_elem > 0 && user_ret == 0) {
        size_t nelem;               /* Number of elements used in sequences */
        size_t nseq;                /* Number of sequences generated */
        size_t curr_seq;            /* Current sequence being worked on */

        /* Get the sequences of bytes */
        if(H5S_SELECT_ITER_GET_SEQ_LIST(iter, (size_t)H5D_IO_VECTOR_SIZE, max_elem, &nseq, &nelem, off, len) < 0)
            HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, FAIL, "sequence length generation failed")

        /* Loop, while sequences left to process */
        for(curr_seq = 0; curr_seq < nseq && user_ret == 0; curr_seq++) {
            hsize_t curr_off;           /* Current offset within sequence */
            size_t curr_len;            /* Length of bytes left to process in sequence */

            /* Get the current offset */
            curr_off = off[curr_seq];

            /* Get the number of bytes in sequence */
            curr_len = len[curr_seq];

            /* Loop, while bytes left in sequence */
            while(curr_len > 0 && user_ret == 0) {
                hsize_t coords[H5S_MAX_RANK];  /* Coordinates of element in dataspace */
                hsize_t tmp_off;        /* Temporary offset within sequence */
                uint8_t *loc;           /* Current element location in buffer */
                int i;			/* Local Index variable */

                /* Compute the coordinate from the offset */
                for(i = (int)ndims, tmp_off = curr_off; i >= 0; i--) {
                    coords[i] = tmp_off % space_size[i];
                    tmp_off /= space_size[i];
                } /* end for */

                /* Get the location within the user's buffer */
                loc = (unsigned char *)buf + curr_off;

                /* Check which type of callback to make */
                switch(op->op_type) {
                    case H5S_SEL_ITER_OP_APP:
                        /* Make the application callback */
                        user_ret = (op->u.app_op.op)(loc, op->u.app_op.type_id, ndims, coords, op_data);
                    break;

                    case H5S_SEL_ITER_OP_LIB:
                        /* Call the library's callback */
                        user_ret = (op->u.lib_op)(loc, type, ndims, coords, op_data);
                    break;

                    default:
                        HGOTO_ERROR(H5E_DATASPACE, H5E_UNSUPPORTED, FAIL, "unsupported op type")
                } /* end switch */

                /* Check for error return from iterator */
                if(user_ret < 0)
                    HERROR(H5E_DATASPACE, H5E_CANTNEXT, "iteration operator failed");

                /* Increment offset in dataspace */
                curr_off += elmt_size;

                /* Decrement number of bytes left in sequence */
                curr_len -= elmt_size;
            } /* end while */
        } /* end for */

        /* Decrement number of elements left to process */
        max_elem -= nelem;
    } /* end while */

    /* Set return value */
    ret_value = user_ret;

done:
    /* Release resources, if allocated */
    if(len)
        len = H5FL_SEQ_FREE(size_t, len);
    if(off)
        off = H5FL_SEQ_FREE(hsize_t, off);

    /* Release selection iterator */
    if(iter_init && H5S_SELECT_ITER_RELEASE(iter) < 0)
        HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator")
    if(iter)
        iter = H5FL_FREE(H5S_sel_iter_t, iter);

    FUNC_LEAVE_NOAPI(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 query
 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;	        /* dataspace to modify */
    H5S_sel_type ret_value;     /* Return value */

    FUNC_ENTER_API(H5S_SEL_ERROR)
    H5TRACE1("St", "i", space_id);

    /* Check args */
    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, H5S_SEL_ERROR, "not a dataspace")

    /* Set return value */
    ret_value = H5S_GET_SELECT_TYPE(space);

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Sget_select_type() */


/*--------------------------------------------------------------------------
 NAME
    H5S_get_select_type
 PURPOSE
    Retrieve the type of selection in a dataspace
 USAGE
    H5S_sel_type H5Sget_select_type(space)
        const H5S_t *space;	        IN: Dataspace object to query
 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.
 COMMENTS
     This routine participates in the "Inlining C function pointers"
        pattern, don't call it directly, use the appropriate macro
        defined in H5Sprivate.h.
--------------------------------------------------------------------------*/
H5_ATTR_PURE H5S_sel_type
H5S_get_select_type(const H5S_t *space)
{
    H5S_sel_type        ret_value = H5S_SEL_ERROR;      /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Check args */
    HDassert(space);

    /* Set return value */
    ret_value = H5S_GET_SELECT_TYPE(space);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_get_select_type() */


/*--------------------------------------------------------------------------
 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
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
htri_t
H5S_select_shape_same(const H5S_t *space1, const H5S_t *space2)
{
    H5S_sel_iter_t *iter_a = NULL;  /* Selection a iteration info */
    H5S_sel_iter_t *iter_b = NULL;  /* Selection b iteration info */
    hbool_t iter_a_init = FALSE;    /* Selection a iteration info has been initialized */
    hbool_t iter_b_init = FALSE;    /* Selection b iteration info has been initialized */
    htri_t ret_value = TRUE;        /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

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

    /* Check for different number of elements selected */
    if(H5S_GET_SELECT_NPOINTS(space1) != H5S_GET_SELECT_NPOINTS(space2))
        HGOTO_DONE(FALSE)

    /* Check special cases if both dataspaces aren't scalar */
    /* (If only one is, the number of selected points check is sufficient) */
    if(space1->extent.rank > 0 && space2->extent.rank > 0) {
        const H5S_t *space_a;           /* Dataspace with larger rank */
        const H5S_t *space_b;           /* Dataspace with smaller rank */
        unsigned space_a_rank;          /* Number of dimensions of dataspace A */
        unsigned space_b_rank;          /* Number of dimensions of dataspace B */
        int space_a_dim;                /* Current dimension in dataspace A */
        int space_b_dim;                /* Current dimension in dataspace B */
        H5S_sel_type sel_a_type;        /* Selection type for dataspace A */
        H5S_sel_type sel_b_type;        /* Selection type for dataspace B */

        /* Need to be able to handle spaces of different rank:
         *
         * To simplify logic, let space_a point to the element of the set
         * {space1, space2} with the largest rank or space1 if the ranks
         * are identical.
         *
         * Similarly, let space_b point to the element of {space1, space2}
         * with the smallest rank, or space2 if they are identical.
         *
         * Let:  space_a_rank be the rank of space_a,
         *       space_b_rank be the rank of space_b,
         *
         * Set all this up here.
         */
        if(space1->extent.rank >= space2->extent.rank) {
            space_a = space1;
            space_b = space2;
        } /* end if */
        else {
            space_a = space2;
            space_b = space1;
        } /* end else */
        space_a_rank = space_a->extent.rank;
        space_b_rank = space_b->extent.rank;
        HDassert(space_a_rank >= space_b_rank);
        HDassert(space_b_rank > 0);

        /* Get selection type for both dataspaces */
        sel_a_type = H5S_GET_SELECT_TYPE(space_a);
        sel_b_type = H5S_GET_SELECT_TYPE(space_b);

        /* If selections aren't "none", compare their bounds */
        if(sel_a_type != H5S_SEL_NONE && sel_b_type != H5S_SEL_NONE) {
            hsize_t low_a[H5S_MAX_RANK];    /* Low bound of selection in dataspace a */
            hsize_t low_b[H5S_MAX_RANK];    /* Low bound of selection in dataspace b */
            hsize_t high_a[H5S_MAX_RANK];   /* High bound of selection in dataspace a */
            hsize_t high_b[H5S_MAX_RANK];   /* High bound of selection in dataspace b */

            /* Get low & high bounds for both dataspaces */
            if(H5S_SELECT_BOUNDS(space_a, low_a, high_a) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "can't get selection bounds for first dataspace")
            if(H5S_SELECT_BOUNDS(space_b, low_b, high_b) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "can't get selection bounds for second dataspace")

            /* Check that the range between the low & high bounds are the same */
            space_a_dim = (int)space_a_rank - 1;
            space_b_dim = (int)space_b_rank - 1;
            while(space_b_dim >= 0) {
                /* Sanity check */
                HDassert(low_a[space_a_dim] <= high_a[space_a_dim]);
                HDassert(low_a[space_b_dim] <= high_a[space_b_dim]);

                /* Verify that the ranges are the same */
                if((high_a[space_a_dim] - low_a[space_a_dim])
                        != (high_b[space_b_dim] - low_b[space_b_dim]))
                    HGOTO_DONE(FALSE)

                /* Go to next dimension */
                space_a_dim--;
                space_b_dim--;
            } /* end while */

            /* Check that the rest of the ranges in space a are "flat" */
            while(space_a_dim >= 0) {
                /* Sanity check */
                HDassert(low_a[space_a_dim] <= high_a[space_a_dim]);

                /* This range should be flat to be the same in a lower dimension */
                if(low_a[space_a_dim] != high_a[space_a_dim])
                    HGOTO_DONE(FALSE)

                space_a_dim--;
            } /* end while */
        } /* end if */

        /* If the dataspaces have the same selection type, use the selection's
         * shape_same operator.
         */
        if(sel_a_type == sel_b_type)
            ret_value = (*space_a->select.type->shape_same)(space_a, space_b);
        /* Otherwise, iterate through all the blocks in the selection */
        else {
            hsize_t start_a[H5S_MAX_RANK];      /* Start point of selection block in dataspace a */
            hsize_t start_b[H5S_MAX_RANK];      /* Start point of selection block in dataspace b */
            hsize_t end_a[H5S_MAX_RANK];        /* End point of selection block in dataspace a */
            hsize_t end_b[H5S_MAX_RANK];        /* End point of selection block in dataspace b */
            hssize_t offset[H5S_MAX_RANK];      /* Offset of selection b blocks relative to selection a blocks */
            hbool_t first_block = TRUE;         /* Flag to indicate the first block */

            /* Allocate the selection iterators */
            if(NULL == (iter_a = H5FL_MALLOC(H5S_sel_iter_t)))
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate selection iterator")
            if(NULL == (iter_b = H5FL_MALLOC(H5S_sel_iter_t)))
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate selection iterator")

            /* Initialize iterator for each dataspace selection
             * Use '0' for element size instead of actual element size to indicate
             * that the selection iterator shouldn't be "flattened", since we
             * aren't actually going to be doing I/O with the iterators.
             */
            if(H5S_select_iter_init(iter_a, space_a, (size_t)0, 0) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator a")
            iter_a_init = TRUE;
            if(H5S_select_iter_init(iter_b, space_b, (size_t)0, 0) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator b")
            iter_b_init = TRUE;

            /* Iterate over all the blocks in each selection */
            while(1) {
                htri_t status_a, status_b;      /* Status from next block checks */

                /* Get the current block for each selection iterator */
                if(H5S_SELECT_ITER_BLOCK(iter_a, start_a, end_a) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get iterator block a")
                if(H5S_SELECT_ITER_BLOCK(iter_b, start_b, end_b) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get iterator block b")

                space_a_dim = (int)space_a_rank - 1;
                space_b_dim = (int)space_b_rank - 1;

                /* The first block only compares the sizes and sets the
                 * relative offsets for later blocks
                 */
                if(first_block) {
                    /* If the block sizes in the common dimensions from
                     * each selection don't match, get out
                     */
                    while(space_b_dim >= 0) {
                        if((end_a[space_a_dim] - start_a[space_a_dim]) !=
                                (end_b[space_b_dim] - start_b[space_b_dim]))
                            HGOTO_DONE(FALSE)

                        /* Set the relative locations of the selections */
                        offset[space_a_dim] = (hssize_t)start_b[space_b_dim] - (hssize_t)start_a[space_a_dim];

                        space_a_dim--;
                        space_b_dim--;
                    } /* end while */

                    /* Similarly, if the block size in any dimension that appears only
                     * in space_a is not equal to 1, get out.
                     */
                    while(space_a_dim >= 0) {
                        if(start_a[space_a_dim] != end_a[space_a_dim])
                            HGOTO_DONE(FALSE)

                        space_a_dim--;
                    } /* end while */

                    /* Reset "first block" flag */
                    first_block = FALSE;
                } /* end if */
                /* Check over the blocks for each selection */
                else {
                    /* For dimensions that space_a and space_b have in common: */
                    while(space_b_dim >= 0) {
                        /* Check if the blocks are in the same relative location */
                        if((hsize_t)((hssize_t)start_a[space_a_dim] + offset[space_a_dim]) != start_b[space_b_dim])
                            HGOTO_DONE(FALSE)

                        /* If the block sizes from each selection doesn't match, get out */
                        if((end_a[space_a_dim] - start_a[space_a_dim]) !=
                                (end_b[space_b_dim] - start_b[space_b_dim]))
                            HGOTO_DONE(FALSE)

                        space_a_dim--;
                        space_b_dim--;
                    } /* end while */

                    /* For dimensions that appear only in space_a: */
                    while(space_a_dim >= 0) {
                        /* If the block size isn't 1, get out */
                        if(start_a[space_a_dim] != end_a[space_a_dim])
                            HGOTO_DONE(FALSE)

                        space_a_dim--;
                    } /* end while */
                } /* end else */

                /* Check if we are able to advance to the next selection block */
                if((status_a = H5S_SELECT_ITER_HAS_NEXT_BLOCK(iter_a)) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to check iterator block a")

                if((status_b = H5S_SELECT_ITER_HAS_NEXT_BLOCK(iter_b)) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to check iterator block b")

                /* Did we run out of blocks at the same time? */
                if((status_a == FALSE) && (status_b == FALSE))
                    break;
                else if(status_a != status_b)
                    HGOTO_DONE(FALSE)
                else {
                    /* Advance to next block in selection iterators */
                    if(H5S_SELECT_ITER_NEXT_BLOCK(iter_a) < 0)
                        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to advance to next iterator block a")

                    if(H5S_SELECT_ITER_NEXT_BLOCK(iter_b) < 0)
                        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to advance to next iterator block b")
                } /* end else */
            } /* end while */
        } /* end else */
    } /* end if */

done:
    if(iter_a_init && H5S_SELECT_ITER_RELEASE(iter_a) < 0)
        HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator a")
    if(iter_a)
        iter_a = H5FL_FREE(H5S_sel_iter_t, iter_a);
    if(iter_b_init && H5S_SELECT_ITER_RELEASE(iter_b) < 0)
        HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator b")
    if(iter_b)
        iter_b = H5FL_FREE(H5S_sel_iter_t, iter_b);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_shape_same() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_construct_projection

 PURPOSE
    Given a dataspace a of rank n with some selection, construct a new
    dataspace b of rank m (m != n), with the selection in a being
    topologically identical to that in b (as verified by
    H5S_select_shape_same().

    This function exists, as some I/O code chokes on topologically
    identical selections with different ranks.  At least to begin
    with, we will deal with the issue by constructing projections
    of the memory dataspace with ranks equaling those of the file
    dataspace.

    Note that if m > n, it is possible that the starting point in the
    buffer associated with the memory dataspace will have to be
    adjusted to match the projected dataspace.  If the buf parameter
    is not NULL, the function must return an adjusted buffer base
    address in *adj_buf_ptr.

 USAGE
    htri_t H5S_select_construct_projection(base_space,
                                           new_space_ptr,
                                           new_space_rank,
                                           buf,
                                           adj_buf_ptr)
        const H5S_t *base_space;     IN: Ptr to Dataspace to project
        H5S_t ** new_space_ptr;     OUT: Ptr to location in which to return
					 the address of the projected space
        int new_space_rank;	     IN: Rank of the projected space.
        const void * buf;            IN: Base address of the buffer
					 associated with the base space.
					 May be NULL.
        void ** adj_buf_ptr;        OUT: If buf != NULL, store the base
					 address of the section of buf
					 that is described by *new_space_ptr
					 in *adj_buf_ptr.

 RETURNS
    Non-negative on success/Negative on failure.

 DESCRIPTION
    Construct a new dataspace and associated selection which is a
    projection of the supplied dataspace and associated selection into
    the specified rank.  Return it in *new_space_ptr.

    If buf is supplied, computes the base address of the projected
    selection in buf, and stores the base address in *adj_buf_ptr.

 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
    The selection in the supplied base_space has thickness 1 in all
    dimensions greater than new_space_rank.  Note that here we count
    dimensions from the fastest changing coordinate to the slowest
    changing changing coordinate.
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_construct_projection(const H5S_t *base_space, H5S_t **new_space_ptr,
    unsigned new_space_rank, const void *buf, void const **adj_buf_ptr, hsize_t element_size)
{
    H5S_t * new_space = NULL;           /* New dataspace constructed */
    hsize_t base_space_dims[H5S_MAX_RANK];      /* Current dimensions of base dataspace */
    hsize_t base_space_maxdims[H5S_MAX_RANK];   /* Maximum dimensions of base dataspace */
    int sbase_space_rank;               /* Signed # of dimensions of base dataspace */
    unsigned base_space_rank;           /* # of dimensions of base dataspace */
    hsize_t projected_space_element_offset = 0; /* Offset of selected element in projected buffer */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(base_space != NULL);
    HDassert((H5S_GET_EXTENT_TYPE(base_space) == H5S_SCALAR) || (H5S_GET_EXTENT_TYPE(base_space) == H5S_SIMPLE));
    HDassert(new_space_ptr != NULL);
    HDassert((new_space_rank != 0) || (H5S_GET_SELECT_NPOINTS(base_space) <= 1));
    HDassert(new_space_rank <= H5S_MAX_RANK);
    HDassert((buf == NULL) || (adj_buf_ptr != NULL));
    HDassert(element_size > 0 );

    /* Get the extent info for the base dataspace */
    if((sbase_space_rank = H5S_get_simple_extent_dims(base_space, base_space_dims, base_space_maxdims)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get dimensionality of base space")
    base_space_rank = (unsigned)sbase_space_rank;
    HDassert(base_space_rank != new_space_rank);

    /* Check if projected space is scalar */
    if(new_space_rank == 0) {
        hssize_t npoints;               /* Number of points selected */

        /* Retreve the number of elements selected */
        if((npoints = (hssize_t)H5S_GET_SELECT_NPOINTS(base_space)) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get number of points selected")
        HDassert(npoints <= 1);

        /* Create new scalar dataspace */
        if(NULL == (new_space = H5S_create(H5S_SCALAR)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "unable to create scalar dataspace")

        /* No need to register the dataspace(i.e. get an ID) as
         * we will just be discarding it shortly.
         */

        /* Selection for the new space will be either all or
         * none, depending on whether the base space has 0 or
         * 1 elements selected.
         *
         * Observe that the base space can't have more than
         * one selected element, since its selection has the
         * same shape as the file dataspace, and that data
         * space is scalar.
         */
        if(1 == npoints) {
            /* Assuming that the selection in the base dataspace is not
             * empty, we must compute the offset of the selected item in
             * the buffer associated with the base dataspace.
             *
             * Since the new space rank is zero, we know that the
             * the base space must have rank at least 1 -- and
             * hence it is a simple dataspace.  However, the
             * selection, may be either point, hyperspace, or all.
             *
             */
            if(H5S_SELECT_PROJECT_SCALAR(base_space, &projected_space_element_offset) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSET, FAIL, "unable to project scalar selection")
        } /* end if */
        else {
            HDassert(0 == npoints);

            if(H5S_select_none(new_space) < 0)
                 HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL, "can't delete default selection")
        } /* end else */
    } /* end if */
    else { /* projected space must be simple */
        hsize_t new_space_dims[H5S_MAX_RANK];   /* Current dimensions for new dataspace */
        hsize_t new_space_maxdims[H5S_MAX_RANK];/* Maximum dimensions for new dataspace */
        unsigned rank_diff;             /* Difference in ranks */

        /* Set up the dimensions of the new, projected dataspace.
         *
         * How we do this depends on whether we are projecting up into
         * increased dimensions, or down into a reduced number of
         * dimensions.
         *
         * If we are projecting up (the first half of the following
         * if statement), we copy the dimensions of the base data
         * space into the fastest changing dimensions of the new
         * projected dataspace, and set the remaining dimensions to
         * one.
         *
         * If we are projecting down (the second half of the following
         * if statement), we just copy the dimensions with the most
         * quickly changing dimensions into the dims for the projected
         * data set.
         *
         * This works, because H5S_select_shape_same() will return
         * true on selections of different rank iff:
         *
         * 1) the selection in the lower rank dataspace matches that
         *    in the dimensions with the fastest changing indicies in
         *    the larger rank dataspace, and
         *
         * 2) the selection has thickness 1 in all ranks that appear
         *    only in the higher rank dataspace (i.e. those with
         *    more slowly changing indicies).
         */
        if(new_space_rank > base_space_rank) {
            hsize_t tmp_dim_size = 1;   /* Temporary dimension value, for filling arrays */

            /* we must copy the dimensions of the base space into
             * the fastest changing dimensions of the new space,
             * and set the remaining dimensions to 1
             */
            rank_diff = new_space_rank - base_space_rank;
            H5VM_array_fill(new_space_dims, &tmp_dim_size, sizeof(tmp_dim_size), rank_diff);
            H5VM_array_fill(new_space_maxdims, &tmp_dim_size, sizeof(tmp_dim_size), rank_diff);
            H5MM_memcpy(&new_space_dims[rank_diff], base_space_dims, sizeof(new_space_dims[0]) * base_space_rank);
            H5MM_memcpy(&new_space_maxdims[rank_diff], base_space_maxdims, sizeof(new_space_maxdims[0]) * base_space_rank);
        } /* end if */
        else { /* new_space_rank < base_space_rank */
            /* we must copy the fastest changing dimension of the
             * base space into the dimensions of the new space.
             */
            rank_diff = base_space_rank - new_space_rank;
            H5MM_memcpy(new_space_dims, &base_space_dims[rank_diff], sizeof(new_space_dims[0]) * new_space_rank);
            H5MM_memcpy(new_space_maxdims, &base_space_maxdims[rank_diff], sizeof(new_space_maxdims[0]) * new_space_rank);
        } /* end else */

        /* now have the new space rank and dimensions set up --
         * so we can create the new simple dataspace.
         */
        if(NULL == (new_space = H5S_create_simple(new_space_rank, new_space_dims, new_space_maxdims)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "can't create simple dataspace")

        /* No need to register the dataspace(i.e. get an ID) as
         * we will just be discarding it shortly.
         */

        /* If we get this far, we have successfully created the projected
         * dataspace.  We must now project the selection in the base
         * dataspace into the projected dataspace.
         */
        if(H5S_SELECT_PROJECT_SIMPLE(base_space, new_space, &projected_space_element_offset) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSET, FAIL, "unable to project simple selection")

        /* If we get this far, we have created the new dataspace, and projected
         * the selection in the base dataspace into the new dataspace.
         *
         * If the base dataspace is simple, check to see if the
         * offset_changed flag on the base selection has been set -- if so,
         * project the offset into the new dataspace and set the
         * offset_changed flag.
         */
        if(H5S_GET_EXTENT_TYPE(base_space) == H5S_SIMPLE && base_space->select.offset_changed) {
            if(new_space_rank > base_space_rank) {
                HDmemset(new_space->select.offset, 0, sizeof(new_space->select.offset[0]) * rank_diff);
                H5MM_memcpy(&new_space->select.offset[rank_diff], base_space->select.offset, sizeof(new_space->select.offset[0]) * base_space_rank);
            } /* end if */
            else
                H5MM_memcpy(new_space->select.offset, &base_space->select.offset[rank_diff], sizeof(new_space->select.offset[0]) * new_space_rank);

            /* Propagate the offset changed flag into the new dataspace. */
            new_space->select.offset_changed = TRUE;
        } /* end if */
    } /* end else */

    /* If we have done the projection correctly, the following assertion
     * should hold.
     */
    HDassert(TRUE == H5S_select_shape_same(base_space, new_space));

    /* load the address of the new space into *new_space_ptr */
    *new_space_ptr = new_space;

    /* now adjust the buffer if required */
    if(buf != NULL) {
        if(new_space_rank < base_space_rank) {
            /* a bit of pointer magic here:
             *
             * Since we can't do pointer arithmetic on void pointers, we first
             * cast buf to a pointer to byte -- i.e. uint8_t.
             *
             * We then multiply the projected space element offset we
             * calculated earlier by the supplied element size, add this
             * value to the type cast buf pointer, cast the result back
             * to a pointer to void, and assign the result to *adj_buf_ptr.
             */
            *adj_buf_ptr = (const void *)(((const uint8_t *)buf) +
                    ((size_t)(projected_space_element_offset * element_size)));
        } /* end if */
        else
            /* No adjustment necessary */
            *adj_buf_ptr = buf;
    } /* end if */

done:
    /* Cleanup on error */
    if(ret_value < 0)
        if(new_space && H5S_close(new_space) < 0)
            HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release dataspace")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_construct_projection() */


/*--------------------------------------------------------------------------
 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(const void *fill, size_t fill_size, const H5S_t *space, void *_buf)
{
    H5S_sel_iter_t *iter = NULL; /* Selection iteration info */
    hbool_t iter_init = FALSE;  /* Selection iteration info has been initialized */
    hsize_t *off = NULL;        /* Array to store sequence offsets */
    size_t *len = NULL;         /* Array to store sequence lengths */
    hssize_t nelmts;            /* Number of elements in selection */
    size_t max_elem;            /* Total number of elements in selection */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Check args */
    HDassert(fill);
    HDassert(fill_size > 0);
    HDassert(space);
    HDassert(_buf);

    /* Allocate the selection iterator */
    if(NULL == (iter = H5FL_MALLOC(H5S_sel_iter_t)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate selection iterator")

    /* Initialize iterator */
    if(H5S_select_iter_init(iter, space, fill_size, 0) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator")
    iter_init = TRUE;	/* Selection iteration info has been initialized */

    /* Get the number of elements in selection */
    if((nelmts = (hssize_t)H5S_GET_SELECT_NPOINTS(space)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't get number of elements selected")

    /* Compute the number of bytes to process */
    H5_CHECKED_ASSIGN(max_elem, size_t, nelmts, hssize_t);

    /* Allocate the offset & length arrays */
    if(NULL == (len = H5FL_SEQ_MALLOC(size_t, H5D_IO_VECTOR_SIZE)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate length vector array")
    if(NULL == (off = H5FL_SEQ_MALLOC(hsize_t, H5D_IO_VECTOR_SIZE)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate offset vector array")

    /* Loop, while elements left in selection */
    while(max_elem > 0) {
        size_t nseq;                /* Number of sequences generated */
        size_t curr_seq;            /* Current sequnce being worked on */
        size_t nelem;               /* Number of elements used in sequences */

        /* Get the sequences of bytes */
        if(H5S_SELECT_ITER_GET_SEQ_LIST(iter, (size_t)H5D_IO_VECTOR_SIZE, max_elem, &nseq, &nelem, off, len) < 0)
            HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, FAIL, "sequence length generation failed")

        /* Loop over sequences */
        for(curr_seq = 0; curr_seq < nseq; curr_seq++) {
            uint8_t *buf;               /* Current location in buffer */

            /* Get offset in memory buffer */
            buf = (uint8_t *)_buf + off[curr_seq];

            /* Fill each sequence in memory with fill value */
            HDassert((len[curr_seq] % fill_size) == 0);
            H5VM_array_fill(buf, fill, fill_size, (len[curr_seq] / fill_size));
        } /* end for */

        /* Decrement number of elements left to process */
        max_elem -= nelem;
    } /* end while */

done:
    /* Release resources, if allocated */
    if(len)
        len = H5FL_SEQ_FREE(size_t, len);
    if(off)
        off = H5FL_SEQ_FREE(hsize_t, off);

    /* Release selection iterator */
    if(iter_init && H5S_SELECT_ITER_RELEASE(iter) < 0)
        HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator")
    if(iter)
        iter = H5FL_FREE(H5S_sel_iter_t, iter);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_fill() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_project_intersection

 PURPOSE
    Projects the intersection of of the selections of src_space and
    src_intersect_space within the selection of src_space as a selection
    within the selection of dst_space

 USAGE
    herr_t H5S_select_project_intersection(src_space,dst_space,src_intersect_space,proj_space)
        H5S_t *src_space;       IN: Selection that is mapped to dst_space, and intersected with src_intersect_space
        H5S_t *dst_space;       IN: Selection that is mapped to src_space, and which contains the result
        H5S_t *src_intersect_space; IN: Selection whose intersection with src_space is projected to dst_space to obtain the result
        H5S_t **new_space_ptr;  OUT: Will contain the result (intersection of src_intersect_space and src_space projected from src_space to dst_space) after the operation

 RETURNS
    Non-negative on success/Negative on failure.

 DESCRIPTION
    Projects the intersection of of the selections of src_space and
    src_intersect_space within the selection of src_space as a selection
    within the selection of dst_space.  The result is placed in the
    selection of new_space_ptr.

 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
    const H5S_t *src_intersect_space, H5S_t **new_space_ptr)
{
    H5S_t *new_space = NULL;           /* New dataspace constructed */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(src_space);
    HDassert(dst_space);
    HDassert(src_intersect_space);
    HDassert(new_space_ptr);

    /* Create new space, using dst extent.  Start with "all" selection. */
    if(NULL == (new_space = H5S_create(H5S_SIMPLE)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "unable to create output dataspace")
    if(H5S__extent_copy_real(&new_space->extent, &dst_space->extent, TRUE) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy destination space extent")

    /* If the intersecting space is "all", the intersection must be equal to the
     * source space and the projection must be equal to the destination space */
    if(src_intersect_space->select.type->type == H5S_SEL_ALL) {
        /* Copy the destination selection. */
        if(H5S_select_copy(new_space, dst_space, FALSE) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't copy destination space selection")
    } /* end if */
    /* If any of the spaces are "none", the projection must also be "none" */
    else if((src_intersect_space->select.type->type == H5S_SEL_NONE)
            || (src_space->select.type->type == H5S_SEL_NONE)
            || (dst_space->select.type->type == H5S_SEL_NONE)) {
        /* Change to "none" selection */
        if(H5S_select_none(new_space) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL, "can't change selection")
    } /* end if */
    /* If any of the spaces use point selection, fall back to general algorithm */
    else if((src_intersect_space->select.type->type == H5S_SEL_POINTS)
            || (src_space->select.type->type == H5S_SEL_POINTS)
            || (dst_space->select.type->type == H5S_SEL_POINTS))
        HGOTO_ERROR(H5E_DATASPACE, H5E_UNSUPPORTED, FAIL, "point selections not currently supported")
    else {
        HDassert(src_intersect_space->select.type->type == H5S_SEL_HYPERSLABS);

        /* Intersecting space is hyperslab selection.  Call the hyperslab
         * routine to project to another hyperslab selection. */
        if(H5S__hyper_project_intersection(src_space, dst_space, src_intersect_space, new_space) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCLIP, FAIL, "can't project hyperslab ondot destination selection")
    } /* end else */

    /* load the address of the new space into *new_space_ptr */
    *new_space_ptr = new_space;

done:
    /* Cleanup on error */
    if(ret_value < 0)
        if(new_space && H5S_close(new_space) < 0)
            HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release dataspace")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_project_intersection() */


/*--------------------------------------------------------------------------
 NAME
    H5S_select_subtract

 PURPOSE
    Subtract one selection from another

 USAGE
    herr_t H5S_select_subtract(space,subtract_space)
        H5S_t *space;           IN/OUT: Selection to be operated on
        H5S_t *subtract_space;  IN: Selection that will be subtracted from space

 RETURNS
    Non-negative on success/Negative on failure.

 DESCRIPTION
    Removes any and all portions of space that are also present in
    subtract_space.  In essence, performs an A_NOT_B operation with the
    two selections.

 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_subtract(H5S_t *space, H5S_t *subtract_space)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(space);
    HDassert(subtract_space);

    /* If either space is using the none selection, then we do not need to do
     * anything */
    if((space->select.type->type != H5S_SEL_NONE)
            && (subtract_space->select.type->type != H5S_SEL_NONE)) {
        /* If subtract_space is using the all selection, set space to none */
        if(subtract_space->select.type->type == H5S_SEL_ALL) {
            /* Change to "none" selection */
            if(H5S_select_none(space) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL, "can't change selection")
        } /* end if */
        /* If either selection is a point selection, fail currently */
        else if((subtract_space->select.type->type == H5S_SEL_POINTS) ||
                (space->select.type->type == H5S_SEL_POINTS)) {
            HGOTO_ERROR(H5E_DATASPACE, H5E_UNSUPPORTED, FAIL, "point selections not currently supported")
        } /* end if */
        else {
            /* Check for all selection in space, convert to hyperslab */
            if(space->select.type->type == H5S_SEL_ALL) {
                /* Convert current "all" selection to "real" hyperslab selection */
                /* Then allow operation to proceed */
                hsize_t tmp_start[H5S_MAX_RANK];        /* Temporary start information */
                hsize_t tmp_stride[H5S_MAX_RANK];       /* Temporary stride information */
                hsize_t tmp_count[H5S_MAX_RANK];        /* Temporary count information */
                hsize_t tmp_block[H5S_MAX_RANK];        /* Temporary block information */
                unsigned u;                             /* Local index variable */

                /* Fill in temporary information for the dimensions */
                for(u = 0; u < space->extent.rank; u++) {
                    tmp_start[u] = 0;
                    tmp_stride[u] = 1;
                    tmp_count[u] = 1;
                    tmp_block[u] = space->extent.size[u];
                } /* end for */

                /* Convert to hyperslab selection */
                if(H5S_select_hyperslab(space, H5S_SELECT_SET, tmp_start, tmp_stride, tmp_count, tmp_block) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, FAIL, "can't convert selection")
            } /* end if */

            HDassert(space->select.type->type == H5S_SEL_HYPERSLABS);
            HDassert(subtract_space->select.type->type == H5S_SEL_HYPERSLABS);

            /* Both spaces are now hyperslabs, perform the operation */
            if(H5S__modify_select(space, H5S_SELECT_NOTB, subtract_space) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCLIP, FAIL, "can't subtract hyperslab")
        } /* end else */
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_select_subtract() */