summaryrefslogtreecommitdiffstats
path: root/src/H5D.c
blob: 6878c9583d4553de4d1477513b6a3ac42ddf25a6 (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
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
/****************************************************************************
* NCSA HDF                                                                  *
* Software Development Group                                                *
* National Center for Supercomputing Applications                           *
* University of Illinois at Urbana-Champaign                                *
* 605 E. Springfield, Champaign IL 61820                                    *
*                                                                           *
* For conditions of distribution and use, see the accompanying              *
* hdf/COPYING file.                                                         *
*                                                                           *
****************************************************************************/

/* $Id$ */

#include "H5private.h"		/* Generic Functions			*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5Dprivate.h"		/* Dataset functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FDprivate.h"	/* File drivers				*/
#include "H5FLprivate.h"	/* Free Lists                           */
#include "H5Gprivate.h"		/* Group headers		  	*/
#include "H5HLprivate.h"	/* Name heap				*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Oprivate.h"		/* Object headers		  	*/
#include "H5Pprivate.h"		/* Property lists			*/
#include "H5Sprivate.h"		/* Dataspace functions rky 980813       */
#include "H5Vprivate.h"		/* Vector and array functions		*/
#include "H5Zprivate.h"		/* Data filters				*/

/*
 * The MPIO driver is needed because there are kludges in this file and
 * places where we check for things that aren't handled by this driver.
 */
#include "H5FDmpio.h"

#ifdef H5_HAVE_PARALLEL
/* Remove this if H5R_DATASET_REGION is no longer used in this file */
#   include "H5Rpublic.h"
#endif

#define PABLO_MASK	H5D_mask


/* forward declarations */
static herr_t H5D_update_chunk( H5D_t *dataset );

/*
 * A dataset is the following struct.
 */
struct H5D_t {
    H5G_entry_t		ent;		/*cached object header stuff	*/
    H5T_t		*type;		/*datatype of this dataset	*/
    hid_t               dcpl_id;        /*dataset creation property id  */
    H5O_layout_t	layout;		/*data layout			*/
};

/* Interface initialization? */
static int interface_initialize_g = 0;
#define INTERFACE_INIT H5D_init_interface
static herr_t H5D_init_interface(void);
static herr_t H5D_init_storage(H5D_t *dataset, const H5S_t *space);
H5D_t * H5D_new(hid_t dcpl_id);

/* Declare a free list to manage the H5D_t struct */
H5FL_DEFINE_STATIC(H5D_t);

/* Declare a free list to manage blocks of type conversion data */
H5FL_BLK_DEFINE_STATIC(type_conv);

/* Declare a free list to manage blocks of background conversion data */
H5FL_BLK_DEFINE_STATIC(bkgr_conv);

/* Declare a free list to manage blocks of fill conversion data */
H5FL_BLK_DEFINE_STATIC(fill_conv);

/* Declare a free list to manage blocks of VL data */
H5FL_BLK_DEFINE_STATIC(vlen_vl_buf);

/* Declare a free list to manage other blocks of VL data */
H5FL_BLK_DEFINE_STATIC(vlen_fl_buf);


/*-------------------------------------------------------------------------
 * Function:	H5D_init
 *
 * Purpose:	Initialize the interface from some other layer.
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Saturday, March 4, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_init(void)
{
    FUNC_ENTER(H5D_init, FAIL);
    /* FUNC_ENTER() does all the work */
    FUNC_LEAVE(SUCCEED);
}


/*--------------------------------------------------------------------------
NAME
   H5D_init_interface -- Initialize interface-specific information
USAGE
    herr_t H5D_init_interface()
   
RETURNS
    Non-negative on success/Negative on failure
DESCRIPTION
    Initializes any interface-specific data or routines.
NOTES
    Care must be taken when using the H5P functions, since they can cause
    a deadlock in the library when the library is attempting to terminate -QAK

--------------------------------------------------------------------------*/
static herr_t
H5D_init_interface(void)
{
    /* Dataset Transfer property class variables.  In sequence, they are,
     * - Transfer Property list class to modify
     * - Default value for maximum temp buffer size
     * - Default value for type conversion buffer
     * - Default value for background buffer
     * - Default value for B-tree node split ratios
     * - Default value for hyperslab caching
     * - Default value for hyperslab cache limit
     * - Default value for vlen allocation function
     * - Default value for vlen allocation information
     * - Default value for vlen free function
     * - Default value for vlen free information
     * - Default value for file driver ID
     * - Default value for file driver info
     * - Default value for 'gather reads' property
     * - Default value for vector size
     */
    H5P_genclass_t  *xfer_pclass;   
    size_t          def_max_temp_buf         = H5D_XFER_MAX_TEMP_BUF_DEF;
    void            *def_tconv_buf           = H5D_XFER_TCONV_BUF_DEF;
    void            *def_bkgr_buf            = H5D_XFER_BKGR_BUF_DEF;   
    H5T_bkg_t       def_bkgr_buf_type        = H5D_XFER_BKGR_BUF_TYPE_DEF;     
    double          def_btree_split_ratio[3] = H5D_XFER_BTREE_SPLIT_RATIO_DEF;
#ifdef H5_WANT_H5_V1_4_COMPAT
    unsigned        def_hyper_cache          = H5D_XFER_HYPER_CACHE_DEF;     
    unsigned        def_hyper_cache_lim      = H5D_XFER_HYPER_CACHE_LIM_DEF;   
#endif /* H5_WANT_H5_V1_4_COMPAT */
    H5MM_allocate_t def_vlen_alloc           = H5D_XFER_VLEN_ALLOC_DEF;     
    void            *def_vlen_alloc_info     = H5D_XFER_VLEN_ALLOC_INFO_DEF;
    H5MM_free_t     def_vlen_free            = H5D_XFER_VLEN_FREE_DEF;    
    void            *def_vlen_free_info      = H5D_XFER_VLEN_FREE_INFO_DEF;
    hid_t           def_vfl_id               = H5D_XFER_VFL_ID_DEF;     
    void            *def_vfl_info            = H5D_XFER_VFL_INFO_DEF;    
#ifdef COALESCE_READS
    hsize_t         def_gather_reads         = H5D_XFER_GATHER_READS_DEF;   
#endif /* COALESCE_READS */
    size_t          def_hyp_vec_size         = H5D_XFER_HYPER_VECTOR_SIZE_DEF; 

    /* Dataset creation property class variables.  In sequence, they are,
     * - Creation property list class to modify
     * - Default value for storage layout property
     * - Default value for chunk dimensionality property
     * - Default value for chunk size
     * - Default value for fill value
     * - Default value for external file list
     * - Default value for data filter pipeline
     */
    H5P_genclass_t  *crt_pclass;
    H5D_layout_t    layout                   = H5D_CRT_LAYOUT_DEF;
    int             chunk_ndims              = H5D_CRT_CHUNK_DIM_DEF;
    hsize_t         chunk_size[32]           = H5D_CRT_CHUNK_SIZE_DEF;
    H5O_fill_t      fill                     = H5D_CRT_FILL_VALUE_DEF;
    H5O_efl_t       efl                      = H5D_CRT_EXT_FILE_LIST_DEF;
    H5O_pline_t     pline                    = H5D_CRT_DATA_PIPELINE_DEF;

    size_t          nprops;                 /* Number of properties */
    herr_t          ret_value                = SUCCEED;   /* Return value */

    FUNC_ENTER(H5D_init_interface, FAIL);

    /* Initialize the atom group for the dataset IDs */
    if (H5I_init_group(H5I_DATASET, H5I_DATASETID_HASHSIZE, H5D_RESERVED_ATOMS, (H5I_free_t)H5D_close)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize interface");

    /* =========Dataset Transfer Property Class Initialization========= */    
    /* Register the default dataset transfer properties */
    assert(H5P_CLS_DATASET_XFER_g!=(-1));

    /* Get the pointer to the dataset transfer class */
    if (H5I_GENPROP_CLS != H5I_get_type(H5P_CLS_DATASET_XFER_g) || NULL == (xfer_pclass = H5I_object(H5P_CLS_DATASET_XFER_g)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list class");

    /* Get the number of properties in the class */
    if(H5P_get_nprops_pclass(xfer_pclass,&nprops)<0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "can't query number of properties");

    /* Assume that if there are properties in the class, they are the default ones */
    if(nprops==0) {
        /* Register the max. temp buffer size property */
        if(H5P_register(xfer_pclass,H5D_XFER_MAX_TEMP_BUF_NAME,H5D_XFER_MAX_TEMP_BUF_SIZE,&def_max_temp_buf,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the type conversion buffer property */
        if(H5P_register(xfer_pclass,H5D_XFER_TCONV_BUF_NAME,H5D_XFER_TCONV_BUF_SIZE,&def_tconv_buf,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the background buffer property */
        if(H5P_register(xfer_pclass,H5D_XFER_BKGR_BUF_NAME,H5D_XFER_BKGR_BUF_SIZE,&def_bkgr_buf,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the background buffer type property */
        if(H5P_register(xfer_pclass,H5D_XFER_BKGR_BUF_TYPE_NAME,H5D_XFER_BKGR_BUF_TYPE_SIZE,&def_bkgr_buf_type,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the B-Tree node splitting ratios property */
        if(H5P_register(xfer_pclass,H5D_XFER_BTREE_SPLIT_RATIO_NAME,H5D_XFER_BTREE_SPLIT_RATIO_SIZE,&def_btree_split_ratio,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

#ifdef H5_WANT_H5_V1_4_COMPAT
        /* Register the hyperslab caching property */
        if(H5P_register(xfer_pclass,H5D_XFER_HYPER_CACHE_NAME,H5D_XFER_HYPER_CACHE_SIZE,&def_hyper_cache,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the hyperslab cache limit property */
        if(H5P_register(xfer_pclass,H5D_XFER_HYPER_CACHE_LIM_NAME,H5D_XFER_HYPER_CACHE_LIM_SIZE,&def_hyper_cache_lim,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");
#endif /* H5_WANT_H5_V1_4_COMPAT */

        /* Register the vlen allocation function property */
        if(H5P_register(xfer_pclass,H5D_XFER_VLEN_ALLOC_NAME,H5D_XFER_VLEN_ALLOC_SIZE,&def_vlen_alloc,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the vlen allocation information property */
        if(H5P_register(xfer_pclass,H5D_XFER_VLEN_ALLOC_INFO_NAME,H5D_XFER_VLEN_ALLOC_INFO_SIZE,&def_vlen_alloc_info,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the vlen free function property */
        if(H5P_register(xfer_pclass,H5D_XFER_VLEN_FREE_NAME,H5D_XFER_VLEN_FREE_SIZE,&def_vlen_free,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the vlen free information property */
        if(H5P_register(xfer_pclass,H5D_XFER_VLEN_FREE_INFO_NAME,H5D_XFER_VLEN_FREE_INFO_SIZE,&def_vlen_free_info,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the file driver ID property */
        if(H5P_register(xfer_pclass,H5D_XFER_VFL_ID_NAME,H5D_XFER_VFL_ID_SIZE,&def_vfl_id,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the file driver info property */
        if(H5P_register(xfer_pclass,H5D_XFER_VFL_INFO_NAME,H5D_XFER_VFL_INFO_SIZE,&def_vfl_info,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

#ifdef COALESCE_READS
        /* Register the 'gather reads' property */
        if(H5P_register(xfer_pclass,H5D_XFER_GATHER_READS_NAME,H5D_XFER_GATHER_READS_SIZE,&def_gather_reads,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");
#endif /* COALESCE_READS */

        /* Register the vector size property */
        if(H5P_register(xfer_pclass,H5D_XFER_HYPER_VECTOR_SIZE_NAME,H5D_XFER_HYPER_VECTOR_SIZE_SIZE,&def_hyp_vec_size,NULL,NULL,NULL,NULL,NULL,NULL)<0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");
    } /* end if */

    /* Only register the default property list if it hasn't been created yet */
    if(H5P_LST_DATASET_XFER_g==(-1)) {
        /* Register the default data transfer property list */
        if ((H5P_LST_DATASET_XFER_g = H5P_create_id (xfer_pclass))<0)
            HGOTO_ERROR (H5E_PLIST, H5E_CANTREGISTER, FAIL, "can't register default property list");
    } /* end if */

    /* =========Dataset Creation Property Class Initialization========== */
    /* Register the default dataset creation properties */
    assert(H5P_CLS_DATASET_CREATE_g != -1);
    
    /* Get the pointer to the dataset creation class */
    if(H5I_GENPROP_CLS != H5I_get_type(H5P_CLS_DATASET_CREATE_g) || NULL == (crt_pclass = H5I_object(H5P_CLS_DATASET_CREATE_g)))
       HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list class");
        
    /* Get the number of properties in the class */
    if(H5P_get_nprops_pclass(crt_pclass,&nprops)<0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "can't query number of properties");

    /* Assume that if there are properties in the class, they are the default ones */
    if(nprops==0) {
        /* Register the storage layout property */ 
        if(H5P_register(crt_pclass, H5D_CRT_LAYOUT_NAME, H5D_CRT_LAYOUT_SIZE, &layout, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
           HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");
        
        /* Register the chunking dimensionality property */
        if(H5P_register(crt_pclass, H5D_CRT_CHUNK_DIM_NAME, H5D_CRT_CHUNK_DIM_SIZE, &chunk_ndims, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
           HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");

        /* Register the chunking size property */ 
        if(H5P_register(crt_pclass, H5D_CRT_CHUNK_SIZE_NAME, H5D_CRT_CHUNK_SIZE_SIZE, chunk_size, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
           HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");
      
        /* Register the fill value property */
        if(H5P_register(crt_pclass, H5D_CRT_FILL_VALUE_NAME, H5D_CRT_FILL_VALUE_SIZE, &fill, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
           HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");
       
        /* Register the external file list property */
        if(H5P_register(crt_pclass, H5D_CRT_EXT_FILE_LIST_NAME, H5D_CRT_EXT_FILE_LIST_SIZE, &efl, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
           HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");
       
        /* Register the data pipeline property */
        if(H5P_register(crt_pclass, H5D_CRT_DATA_PIPELINE_NAME, H5D_CRT_DATA_PIPELINE_SIZE, &pline, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
           HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class");
    } /* end if */

    /* Only register the default property list if it hasn't been created yet */
    if(H5P_LST_DATASET_CREATE_g==(-1)) {
        /* Register the default data transfer property list */
        if ((H5P_LST_DATASET_CREATE_g = H5P_create_id (crt_pclass))<0)
            HGOTO_ERROR (H5E_PLIST, H5E_CANTREGISTER, FAIL, "can't register default property list");
    } /* end if */

done:
    FUNC_LEAVE(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_term_interface
 *
 * Purpose:	Terminate this interface.
 *
 * Return:	Success:	Positive if anything was done that might
 *				affect other interfaces; zero otherwise.
 *
 * 		Failure:	Negative.
 *
 * Programmer:	Robb Matzke
 *              Friday, November 20, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
int
H5D_term_interface(void)
{
    int		n=0;

    if (interface_initialize_g) {
	if ((n=H5I_nmembers(H5I_DATASET))) {
	    H5I_clear_group(H5I_DATASET, FALSE);
	} else {
	    H5I_destroy_group(H5I_DATASET);
	    interface_initialize_g = 0;
	    n = 1; /*H5I*/
	}
    }
    return n;
}


/*-------------------------------------------------------------------------
 * Function:       H5D_crt_copy
 *
 * Purpose:        Callback routine which is called whenever any dataset 
 *                 creation property list is copied.  This routine copies
 *                 the properties from the old list to the new list.
 *
 * Return:         Success:        Non-negative
 *
 *                 Failure:        Negative
 *
 * Programmer:     Raymond Lu
 *                 Tuesday, October 2, 2001
 *
 * Modification: 
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_crt_copy(hid_t new_plist_id, hid_t old_plist_id, void UNUSED *copy_data)
{
    H5O_fill_t     src_fill, dst_fill;
    H5O_efl_t      src_efl, dst_efl;
    H5O_pline_t    src_pline, dst_pline;
    H5P_genplist_t *old_plist;
    H5P_genplist_t *new_plist;
    herr_t         ret_value=SUCCEED;

    FUNC_ENTER(H5D_crt_copy, FAIL);

    /* Verify property list ID */
    if (TRUE!=H5P_isa_class(new_plist_id,H5P_DATASET_CREATE) || NULL == (new_plist = H5I_object(new_plist_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");
    if (TRUE!=H5P_isa_class(old_plist_id,H5P_DATASET_CREATE) || NULL == (old_plist = H5I_object(old_plist_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");

    /* Get the fill value, external file list, and data pipeline properties
     * from the old property list */
    HDmemset(&src_fill,0,sizeof(H5O_fill_t));
    if(H5P_get(old_plist, H5D_CRT_FILL_VALUE_NAME, &src_fill) < 0) 
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get fill value");
    HDmemset(&src_efl,0,sizeof(H5O_efl_t));
    if(H5P_get(old_plist, H5D_CRT_EXT_FILE_LIST_NAME, &src_efl) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get external file list");
    HDmemset(&src_pline,0,sizeof(H5O_pline_t));
    if(H5P_get(old_plist, H5D_CRT_DATA_PIPELINE_NAME, &src_pline) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get pipeline");

    /* Make copies of fill value, external file list, and data pipeline */
    HDmemset(&dst_fill,0,sizeof(H5O_fill_t));
    if(NULL==H5O_copy(H5O_FILL, &src_fill, &dst_fill)) 
        HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "can't copy fill value");
    HDmemset(&dst_efl,0,sizeof(H5O_efl_t));
    if(NULL==H5O_copy(H5O_EFL, &src_efl, &dst_efl)) 
        HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "can't copy external file list");
    HDmemset(&dst_pline,0,sizeof(H5O_pline_t));
    if(NULL==H5O_copy(H5O_PLINE, &src_pline, &dst_pline)) 
        HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "can't copy data pipeline");

    /* Set the fill value, external file list, and data pipeline property 
     * for the new property list */
    if(H5P_set(new_plist, H5D_CRT_FILL_VALUE_NAME, &dst_fill) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set fill value");
    if(H5P_set(new_plist, H5D_CRT_EXT_FILE_LIST_NAME, &dst_efl) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set external file list");
    if(H5P_set(new_plist, H5D_CRT_DATA_PIPELINE_NAME, &dst_pline) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set pipeline");

done:
    FUNC_LEAVE(ret_value);    
}


/*-------------------------------------------------------------------------
 * Function:	H5D_crt_close
 *
 * Purpose:	Callback routine which is called whenever any dataset create
 *              property list is closed.  This routine performs any generic
 *              cleanup needed on the properties the library put into the list.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, July 11, 2001
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_crt_close(hid_t dcpl_id, void UNUSED *close_data)
{
    H5O_fill_t     fill;
    H5O_efl_t      efl;
    H5O_pline_t    pline;
    H5P_genplist_t *plist;      /* Property list */
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER(H5D_crt_close, FAIL);

    /* Check arguments */
    if (TRUE!=H5P_isa_class(dcpl_id,H5P_DATASET_CREATE) || NULL == (plist = H5I_object(dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");

    /* Get the fill value, external file list, and data pipeline properties
     * from the old property list */
    HDmemset(&fill,0,sizeof(H5O_fill_t));
    if(H5P_get(plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0) 
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get fill value");
    HDmemset(&efl,0,sizeof(H5O_efl_t));
    if(H5P_get(plist, H5D_CRT_EXT_FILE_LIST_NAME, &efl) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get external file list");
    HDmemset(&pline,0,sizeof(H5O_pline_t));
    if(H5P_get(plist, H5D_CRT_DATA_PIPELINE_NAME, &pline) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get pipeline");

    /* Clean up any values set for the fill-value, external file-list and
     * data pipeline */
    H5O_reset(H5O_FILL, &fill);
    H5O_reset(H5O_EFL, &efl);
    H5O_reset(H5O_PLINE, &pline);

done:
    FUNC_LEAVE(ret_value);
} /* end H5D_crt_close() */


/*-------------------------------------------------------------------------
 * Function:	H5D_xfer_create
 *
 * Purpose:	Callback routine which is called whenever any dataset transfer
 *              property list is created.  This routine performs any generic
 *              initialization needed on the properties the library put into
 *              the list.
 *              Right now, it's just allocating the driver-specific dataset
 *              transfer information.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              Thursday, August 2, 2001
 *
 * Notes:       This same routine is currently used for the 'copy' callback.
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_xfer_create(hid_t dxpl_id, void UNUSED *create_data)
{
    hid_t driver_id;            /* VFL driver ID */
    void *driver_info;          /* VFL driver info */
    H5P_genplist_t *plist;      /* Property list */
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER(H5D_xfer_create, FAIL);

    /* Check arguments */
    if (TRUE!=H5P_isa_class(dxpl_id,H5P_DATASET_XFER) || NULL == (plist = H5I_object(dxpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset transfer property list");

    /* Get the driver information */
    if(H5P_get(plist, H5D_XFER_VFL_ID_NAME, &driver_id)<0)
        HGOTO_ERROR (H5E_PLIST, H5E_CANTGET, FAIL, "Can't retrieve VFL driver ID");
    if(H5P_get(plist, H5D_XFER_VFL_INFO_NAME, &driver_info)<0)
        HGOTO_ERROR (H5E_PLIST, H5E_CANTGET, FAIL, "Can't retrieve VFL driver info");

    /* Check if we have a valid driver ID */
    if(driver_id>0) {
        /* Increment the reference count on the driver and copy the driver info */
        if(H5I_inc_ref(driver_id)<0)
            HGOTO_ERROR (H5E_DATASET, H5E_CANTINC, FAIL, "Can't increment VFL driver ID");
        if((driver_info = H5FD_dxpl_copy(driver_id, driver_info))==NULL)
            HGOTO_ERROR (H5E_DATASET, H5E_CANTCOPY, FAIL, "Can't copy VFL driver");
        
        /* Set the driver information for the new property list */
        if(H5P_set(plist, H5D_XFER_VFL_ID_NAME, &driver_id)<0)
            HGOTO_ERROR (H5E_PLIST, H5E_CANTSET, FAIL, "Can't set VFL driver ID");
        if(H5P_set(plist, H5D_XFER_VFL_INFO_NAME, &driver_info)<0)
            HGOTO_ERROR (H5E_PLIST, H5E_CANTSET, FAIL, "Can't set VFL driver info");
    } /* end if */

done:
    FUNC_LEAVE(ret_value);
} /* end H5D_xfer_create() */


/*-------------------------------------------------------------------------
 * Function:       H5D_xfer_copy
 *
 * Purpose:        Callback routine which is called whenever any dataset 
 *                 transfer property list is copied.  This routine copies
 *                 the properties from the old list to the new list.
 *
 * Return:         Success:        Non-negative
 *
 *                 Failure:        Negative
 *
 * Programmer:     Raymond Lu
 *                 Tuesday, October 2, 2001
 *
 * Modification: 
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_xfer_copy(hid_t new_plist_id, hid_t UNUSED old_plist_id, 
                void *copy_data)
{
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER(H5D_xfer_copy, FAIL);

    if(H5D_xfer_create(new_plist_id, copy_data) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "can't copy property list");

done:
    FUNC_LEAVE(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_xfer_close
 *
 * Purpose:	Callback routine which is called whenever any dataset transfer
 *              property list is closed.  This routine performs any generic
 *              cleanup needed on the properties the library put into the list.
 *              Right now, it's just freeing the driver-specific dataset
 *              transfer information.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, July 11, 2001
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_xfer_close(hid_t dxpl_id, void UNUSED *close_data)
{
    hid_t driver_id;            /* VFL driver ID */
    void *driver_info;          /* VFL driver info */
    H5P_genplist_t *plist;      /* Property list */
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER(H5D_xfer_close, FAIL);

    /* Check arguments */
    if (TRUE!=H5P_isa_class(dxpl_id,H5P_DATASET_XFER) || NULL == (plist = H5I_object(dxpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset transfer property list");

    if(H5P_get(plist, H5D_XFER_VFL_ID_NAME, &driver_id)<0)
        HGOTO_ERROR (H5E_PLIST, H5E_CANTGET, FAIL, "Can't retrieve VFL driver ID");
    if(H5P_get(plist, H5D_XFER_VFL_INFO_NAME, &driver_info)<0)
        HGOTO_ERROR (H5E_PLIST, H5E_CANTGET, FAIL, "Can't retrieve VFL driver info");
    if(driver_id>0) {
        if(H5FD_dxpl_free(driver_id, driver_info)<0)
            HGOTO_ERROR (H5E_DATASET, H5E_CANTFREE, FAIL, "Can't free VFL driver");
        if(H5I_dec_ref(driver_id)<0)
            HGOTO_ERROR (H5E_DATASET, H5E_CANTFREE, FAIL, "Can't decrement VFL driver ID");
    } /* end if */

done:
    FUNC_LEAVE(ret_value);
} /* end H5D_xfer_close() */


/*-------------------------------------------------------------------------
 * Function:	H5Dcreate
 *
 * Purpose:	Creates a new dataset named NAME at LOC_ID, opens the
 *		dataset for access, and associates with that dataset constant
 *		and initial persistent properties including the type of each
 *		datapoint as stored in the file (TYPE_ID), the size of the
 *		dataset (SPACE_ID), and other initial miscellaneous
 *		properties (PLIST_ID).
 *
 *		All arguments are copied into the dataset, so the caller is
 *		allowed to derive new types, data spaces, and creation
 *		parameters from the old ones and reuse them in calls to
 *		create other datasets.
 *
 * Return:	Success:	The object ID of the new dataset.  At this
 *				point, the dataset is ready to receive its
 *				raw data.  Attempting to read raw data from
 *				the dataset will probably return the fill
 *				value.	The dataset should be closed when
 *				the caller is no longer interested in it.
 *
 *		Failure:	FAIL
 *
 * Errors:
 *		ARGS	  BADTYPE	Not a data space. 
 *		ARGS	  BADTYPE	Not a dataset creation plist. 
 *		ARGS	  BADTYPE	Not a file. 
 *		ARGS	  BADTYPE	Not a type. 
 *		ARGS	  BADVALUE	No name. 
 *		DATASET	  CANTINIT	Can't create dataset. 
 *		DATASET	  CANTREGISTER	Can't register dataset. 
 *
 * Programmer:	Robb Matzke
 *		Wednesday, December  3, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dcreate(hid_t loc_id, const char *name, hid_t type_id, hid_t space_id,
	  hid_t plist_id)
{
    H5G_entry_t		   *loc = NULL;
    H5T_t		   *type = NULL;
    H5S_t		   *space = NULL;
    H5D_t		   *new_dset = NULL;
    hid_t		    ret_value = FAIL;

    FUNC_ENTER(H5Dcreate, FAIL);
    H5TRACE5("i","isiii",loc_id,name,type_id,space_id,plist_id);

    /* Check arguments */
    if (NULL == (loc = H5G_loc(loc_id))) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location");
    }
    if (!name || !*name) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name");
    }
    if (H5I_DATATYPE != H5I_get_type(type_id) ||
	NULL == (type = H5I_object(type_id))) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a type");
    }
    if (H5I_DATASPACE != H5I_get_type(space_id) ||
	NULL == (space = H5I_object(space_id))) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }
    if(H5P_DEFAULT == plist_id)
        plist_id = H5P_DATASET_CREATE_DEFAULT;
    if(H5I_GENPROP_LST != H5I_get_type(plist_id) ||
        TRUE != H5P_isa_class(plist_id, H5P_DATASET_CREATE))
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, 
                      "not dataset create property list");

    /* build and open the new dataset */
    if (NULL == (new_dset = H5D_create(loc, name, type, space, plist_id))) {
	HRETURN_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL,
		      "unable to create dataset");
    }
    /* Register the new dataset to get an ID for it */
    if ((ret_value = H5I_register(H5I_DATASET, new_dset)) < 0) {
	H5D_close(new_dset);
	HRETURN_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL,
		      "unable to register dataset");
    }
    FUNC_LEAVE(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5Dopen
 *
 * Purpose:	Finds a dataset named NAME at LOC_ID, opens it, and returns
 *		its ID.	 The dataset should be close when the caller is no
 *		longer interested in it.
 *
 * Return:	Success:	A new dataset ID
 *
 *		Failure:	FAIL
 *
 * Errors:
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dopen(hid_t loc_id, const char *name)
{
    H5G_entry_t	*loc = NULL;		/*location holding the dataset	*/
    H5D_t	*dataset = NULL;	/*the dataset			*/
    hid_t	ret_value = FAIL;

    FUNC_ENTER(H5Dopen, FAIL);
    H5TRACE2("i","is",loc_id,name);

    /* Check args */
    if (NULL == (loc = H5G_loc(loc_id))) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location");
    }
    if (!name || !*name) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name");
    }
    
    /* Find the dataset */
    if (NULL == (dataset = H5D_open(loc, name))) {
	HRETURN_ERROR(H5E_DATASET, H5E_NOTFOUND, FAIL, "dataset not found");
    }
    
    /* Create an atom for the dataset */
    if ((ret_value = H5I_register(H5I_DATASET, dataset)) < 0) {
	H5D_close(dataset);
	HRETURN_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL,
		      "can't register dataset");
    }
    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * Function:	H5Dclose
 *
 * Purpose:	Closes access to a dataset (DATASET_ID) and releases
 *		resources used by it. It is illegal to subsequently use that
 *		same dataset ID in calls to other dataset functions.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Errors:
 *		ARGS	  BADTYPE	Not a dataset. 
 *		DATASET	  CANTINIT	Can't free. 
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dclose(hid_t dset_id)
{
    H5D_t		   *dset = NULL;	/* dataset object to release */

    FUNC_ENTER(H5Dclose, FAIL);
    H5TRACE1("e","i",dset_id);

    /* Check args */
    if (H5I_DATASET != H5I_get_type(dset_id) ||
	NULL == (dset = H5I_object(dset_id)) ||
	NULL == dset->ent.file) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
    }
    /*
     * Decrement the counter on the dataset.  It will be freed if the count
     * reaches zero.
     */
    if (H5I_dec_ref(dset_id) < 0) {
	HRETURN_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't free");
    }
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:	H5Dget_space
 *
 * Purpose:	Returns a copy of the file data space for a dataset.
 *
 * Return:	Success:	ID for a copy of the data space.  The data
 *				space should be released by calling
 *				H5Sclose().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke
 *		Wednesday, January 28, 1998
 *
 * Modifications:
 *	Robb Matzke, 9 Jun 1998
 *	The data space is not constant and is no longer cached by the dataset
 *	struct.
 *-------------------------------------------------------------------------
 */
hid_t
H5Dget_space(hid_t dset_id)
{
    H5D_t	*dset = NULL;
    H5S_t	*space = NULL;
    hid_t	ret_value = FAIL;
    
    FUNC_ENTER (H5Dget_space, FAIL);
    H5TRACE1("i","i",dset_id);

    /* Check args */
    if (H5I_DATASET!=H5I_get_type (dset_id) ||
	NULL==(dset=H5I_object (dset_id))) {
	HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
    }

    /* Read the data space message and return a data space object */
    if (NULL==(space=H5D_get_space (dset))) {
	HRETURN_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL,
		       "unable to get data space");
    }

    /* Create an atom */
    if ((ret_value=H5I_register (H5I_DATASPACE, space))<0) {
	H5S_close(space);
	HRETURN_ERROR (H5E_ATOM, H5E_CANTREGISTER, FAIL,
		       "unable to register data space");
    }

    FUNC_LEAVE (ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_get_space
 *
 * Purpose:	Returns the data space associated with the dataset.
 *
 * Return:	Success:	Ptr to a copy of the data space.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Tuesday, August 25, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5S_t *
H5D_get_space(H5D_t *dset)
{
    H5S_t	*space = NULL;
    
    FUNC_ENTER(H5D_get_space, NULL);
    assert(dset);

    if (NULL==(space=H5S_read(&(dset->ent)))) {
	HRETURN_ERROR(H5E_DATASET, H5E_CANTINIT, NULL,
		      "unable to load space info from dataset header");
    }

    FUNC_LEAVE(space);
}


/*-------------------------------------------------------------------------
 * Function:	H5Dget_type
 *
 * Purpose:	Returns a copy of the file data type for a dataset.
 *
 * Return:	Success:	ID for a copy of the data type.	 The data
 *				type should be released by calling
 *				H5Tclose().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke
 *		Tuesday, February  3, 1998
 *
 * Modifications:
 *
 * 	Robb Matzke, 1 Jun 1998
 *	If the dataset has a named data type then a handle to the opened data
 *	type is returned.  Otherwise the returned data type is read-only.  If
 *	atomization of the data type fails then the data type is closed.
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dget_type(hid_t dset_id)
{
    
    H5D_t	*dset = NULL;
    H5T_t	*copied_type = NULL;
    hid_t	ret_value = FAIL;
    
    FUNC_ENTER (H5Dget_type, FAIL);
    H5TRACE1("i","i",dset_id);

    /* Check args */
    if (H5I_DATASET!=H5I_get_type (dset_id) ||
	NULL==(dset=H5I_object (dset_id))) {
	HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
    }

    /* Copy the data type and mark it read-only */
    if (NULL==(copied_type=H5T_copy (dset->type, H5T_COPY_REOPEN))) {
	HRETURN_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL,
		       "unable to copy the data type");
    }
    /* Mark any VL datatypes as being in memory now */
	if (H5T_vlen_mark(copied_type, NULL, H5T_VLEN_MEMORY)<0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "invalid VL location");
    }
    if (H5T_lock (copied_type, FALSE)<0) {
	H5T_close (copied_type);
	HRETURN_ERROR (H5E_DATATYPE, H5E_CANTINIT, FAIL,
		       "unable to lock transient data type");
    }
    
    /* Create an atom */
    if ((ret_value=H5I_register (H5I_DATATYPE, copied_type))<0) {
	H5T_close (copied_type);
	HRETURN_ERROR (H5E_ATOM, H5E_CANTREGISTER, FAIL,
		       "unable to register data type");
    }

    FUNC_LEAVE (ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5Dget_create_plist
 *
 * Purpose:	Returns a copy of the dataset creation property list.
 *
 * Return:	Success:	ID for a copy of the dataset creation
 *				property list.  The template should be
 *				released by calling H5P_close().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke
 *		Tuesday, February  3, 1998
 *
 * Modifications:
 * 
 *              Raymond Lu
 *              Tuesday, October 2, 2001
 *              The way to retrieve and set property is changed for the 
 *              generic property list.
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Dget_create_plist(hid_t dset_id)
{
    H5D_t		*dset = NULL;
    H5O_fill_t          copied_fill={NULL,0,NULL};
    H5P_genplist_t     *dcpl_plist;
    H5P_genplist_t     *new_plist;
    hid_t		ret_value = FAIL;
    
    FUNC_ENTER (H5Dget_create_plist, FAIL);
    H5TRACE1("i","i",dset_id);

    /* Check args */
    if (H5I_DATASET!=H5I_get_type (dset_id) || NULL==(dset=H5I_object (dset_id)))
	HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
    if (NULL == (dcpl_plist = H5I_object(dset->dcpl_id)))
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't get property list");

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

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

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

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

    FUNC_LEAVE (ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5Dread
 *
 * Purpose:	Reads (part of) a DSET from the file into application
 *		memory BUF. The part of the dataset to read is defined with
 *		MEM_SPACE_ID and FILE_SPACE_ID.	 The data points are
 *		converted from their file type to the MEM_TYPE_ID specified. 
 *		Additional miscellaneous data transfer properties can be
 *		passed to this function with the PLIST_ID argument.
 *
 *		The FILE_SPACE_ID can be the constant H5S_ALL which indicates
 *		that the entire file data space is to be referenced.
 *
 *		The MEM_SPACE_ID can be the constant H5S_ALL in which case
 *		the memory data space is the same as the file data space
 *		defined when the dataset was created.
 *
 *		The number of elements in the memory data space must match
 *		the number of elements in the file data space.
 *
 *		The PLIST_ID can be the constant H5P_DEFAULT in which
 *		case the default data transfer properties are used.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Errors:
 *		ARGS	  BADTYPE	Not a data space. 
 *		ARGS	  BADTYPE	Not a data type. 
 *		ARGS	  BADTYPE	Not a dataset. 
 *		ARGS	  BADTYPE	Not xfer parms. 
 *		ARGS	  BADVALUE	No output buffer. 
 *		DATASET	  READERROR	Can't read data. 
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dread(hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id,
	hid_t file_space_id, hid_t plist_id, void *buf/*out*/)
{
    H5D_t		   *dset = NULL;
    const H5T_t		   *mem_type = NULL;
    const H5S_t		   *mem_space = NULL;
    const H5S_t		   *file_space = NULL;

    FUNC_ENTER(H5Dread, FAIL);
    H5TRACE6("e","iiiiix",dset_id,mem_type_id,mem_space_id,file_space_id,
             plist_id,buf);

    /* check arguments */
    if (H5I_DATASET != H5I_get_type(dset_id) ||
            NULL == (dset = H5I_object(dset_id)) ||
            NULL == dset->ent.file) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
    }
    if (H5I_DATATYPE != H5I_get_type(mem_type_id) ||
            NULL == (mem_type = H5I_object(mem_type_id))) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    }
    if (H5S_ALL != mem_space_id) {
	if (H5I_DATASPACE != H5I_get_type(mem_space_id) ||
                NULL == (mem_space = H5I_object(mem_space_id))) {
	    HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
	}
	/* Check for valid selection */
	if(H5S_select_valid(mem_space)!=TRUE) {
	    HRETURN_ERROR(H5E_DATASPACE, H5E_BADRANGE, FAIL,
			  "selection+offset not within extent");
	}
    }
    if (H5S_ALL != file_space_id) {
	if (H5I_DATASPACE != H5I_get_type(file_space_id) ||
                NULL == (file_space = H5I_object(file_space_id))) {
	    HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
	}
	/* Check for valid selection */
	if(H5S_select_valid(file_space)!=TRUE) {
	    HRETURN_ERROR(H5E_DATASPACE, H5E_BADRANGE, FAIL,
			  "selection+offset not within extent");
	}
    }

    /* Get the default dataset transfer property list if the user didn't provide one */
    if (H5P_DEFAULT == plist_id)
        plist_id= H5P_DATASET_XFER_DEFAULT;

    if (H5I_GENPROP_LST != H5I_get_type(plist_id) ||
            TRUE!=H5P_isa_class(plist_id,H5P_DATASET_XFER))
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not xfer parms");
    if (!buf)
	HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no output buffer");

    /* read raw data */
    if (H5D_read(dset, mem_type, mem_space, file_space, plist_id, buf/*out*/) < 0)
	HRETURN_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "can't read data");

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:	H5Dwrite
 *
 * Purpose:	Writes (part of) a DSET from application memory BUF to the
 *		file.  The part of the dataset to write is defined with the
 *		MEM_SPACE_ID and FILE_SPACE_ID arguments. The data points
 *		are converted from their current type (MEM_TYPE_ID) to their
 *		file data type.	 Additional miscellaneous data transfer
 *		properties can be passed to this function with the
 *		PLIST_ID argument.
 *
 *		The FILE_SPACE_ID can be the constant H5S_ALL which indicates
 *		that the entire file data space is to be referenced.
 *
 *		The MEM_SPACE_ID can be the constant H5S_ALL in which case
 *		the memory data space is the same as the file data space
 *		defined when the dataset was created.
 *
 *		The number of elements in the memory data space must match
 *		the number of elements in the file data space.
 *
 *		The PLIST_ID can be the constant H5P_DEFAULT in which
 *		case the default data transfer properties are used.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Errors:
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dwrite(hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id,
	 hid_t file_space_id, hid_t plist_id, const void *buf)
{
    H5D_t		   *dset = NULL;
    const H5T_t		   *mem_type = NULL;
    const H5S_t		   *mem_space = NULL;
    const H5S_t		   *file_space = NULL;

    FUNC_ENTER(H5Dwrite, FAIL);
    H5TRACE6("e","iiiiix",dset_id,mem_type_id,mem_space_id,file_space_id,
             plist_id,buf);

    /* check arguments */
    if (H5I_DATASET != H5I_get_type(dset_id) ||
            NULL == (dset = H5I_object(dset_id)) ||
            NULL == dset->ent.file) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
    }
    if (H5I_DATATYPE != H5I_get_type(mem_type_id) ||
            NULL == (mem_type = H5I_object(mem_type_id))) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    }
    if (H5S_ALL != mem_space_id) {
	if (H5I_DATASPACE != H5I_get_type(mem_space_id) ||
                NULL == (mem_space = H5I_object(mem_space_id))) {
	    HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
	}
	/* Check for valid selection */
	if (H5S_select_valid(mem_space)!=TRUE) {
	    HRETURN_ERROR(H5E_DATASPACE, H5E_BADRANGE, FAIL,
			  "selection+offset not within extent");
	}
    }
    if (H5S_ALL != file_space_id) {
	if (H5I_DATASPACE != H5I_get_type(file_space_id) ||
                NULL == (file_space = H5I_object(file_space_id))) {
	    HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
	}
	/* Check for valid selection */
	if (H5S_select_valid(file_space)!=TRUE) {
	    HRETURN_ERROR(H5E_DATASPACE, H5E_BADRANGE, FAIL,
			  "selection+offset not within extent");
	}
    }

    /* Get the default dataset transfer property list if the user didn't provide one */
    if (H5P_DEFAULT == plist_id)
        plist_id= H5P_DATASET_XFER_DEFAULT;

    if (H5I_GENPROP_LST != H5I_get_type(plist_id) ||
            TRUE!=H5P_isa_class(plist_id,H5P_DATASET_XFER))
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not xfer parms");
    if (!buf)
	HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no output buffer");

    /* write raw data */
    if (H5D_write(dset, mem_type, mem_space, file_space, plist_id, buf) < 0)
	HRETURN_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "can't write data");

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:	H5Dextend
 *
 * Purpose:	This function makes sure that the dataset is at least of size
 *		SIZE. The dimensionality of SIZE is the same as the data
 *		space of the dataset being changed.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Friday, January 30, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dextend(hid_t dset_id, const hsize_t *size)
{
    H5D_t	*dset = NULL;
    
    FUNC_ENTER (H5Dextend, FAIL);
    H5TRACE2("e","i*h",dset_id,size);

    /* Check args */
    if (H5I_DATASET!=H5I_get_type(dset_id) ||
	NULL==(dset=H5I_object(dset_id))) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
    }
    if (!size) {
	HRETURN_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "no size specified");
    }

    /* Increase size */
    if (H5D_extend (dset, size)<0) {
	HRETURN_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL,
		       "unable to extend dataset");
    }

    FUNC_LEAVE (SUCCEED);
}







/*-------------------------------------------------------------------------
 * Function:	H5D_new
 *
 * Purpose:	Creates a new, empty dataset structure
 *
 * Return:	Success:	Pointer to a new dataset descriptor.
 *
 *		Failure:	NULL
 *
 * Errors:
 *
 * Programmer:	Quincey Koziol
 *		Monday, October 12, 1998
 *
 * Modifications:
 *
 *              Raymond Lu
 *              Tuesday, October 2, 2001
 *              Changed the way to query and inialization for generic
 *              property list.
 *
 *-------------------------------------------------------------------------
 */
H5D_t *
H5D_new(hid_t dcpl_id)
{
    H5P_genplist_t	*plist;    /* Property list created */
    H5D_t	*ret_value = NULL;	/*return value			*/
    
    FUNC_ENTER(H5D_new, NULL);

    /* check args */
    /* Nothing to check */
    
    if (NULL==(ret_value = H5FL_ALLOC(H5D_t,1)))
        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
    if(H5P_DEFAULT == dcpl_id)
        dcpl_id = H5P_DATASET_CREATE_DEFAULT;
    if(TRUE != H5P_isa_class(dcpl_id, H5P_DATASET_CREATE))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not property list");

    /* Check arguments. */
    if (NULL == (plist = H5I_object(dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a property list");

    ret_value->dcpl_id = H5P_copy_plist(plist);
    ret_value->ent.header = HADDR_UNDEF;

    /* Success */

done:
    FUNC_LEAVE(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_create
 *
 * Purpose:	Creates a new dataset with name NAME in file F and associates
 *		with it a datatype TYPE for each element as stored in the
 *		file, dimensionality information or dataspace SPACE, and
 *		other miscellaneous properties CREATE_PARMS.  All arguments
 *		are deep-copied before being associated with the new dataset,
 *		so the caller is free to subsequently modify them without
 *		affecting the dataset.
 *
 * Return:	Success:	Pointer to a new dataset
 *
 *		Failure:	NULL
 *
 * Errors:
 *		DATASET	  CANTINIT	Can't update dataset header. 
 *		DATASET	  CANTINIT	Problem with the dataset name. 
 *		DATASET	  CANTINIT	Fail in file space allocation for
 *					chunks
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 *	Robb Matzke, 9 Jun 1998
 *	The data space message is no longer cached in the dataset struct.
 *
 * 	Robb Matzke, 27 Jul 1998
 *	Added the MTIME message to the dataset object header.
 *
 * 	Robb Matzke, 1999-10-14
 *	The names for the external file list are entered into the heap hear
 *	instead of when the efl message is encoded, preventing a possible
 *	infinite recursion situation.
 *
 *      Raymond Lu
 *      Tuesday, October 2, 2001
 *      Changed the way to retrieve and set property for generic property 
 *      list.
 *
 *-------------------------------------------------------------------------
 */
H5D_t *
H5D_create(H5G_entry_t *loc, const char *name, const H5T_t *type, 
           const H5S_t *space, hid_t dcpl_id)
{
    H5D_t		*new_dset = NULL;
    H5D_t		*ret_value = NULL;
    int		        i, ndims;
    unsigned		u;
    hsize_t		max_dim[H5O_LAYOUT_NDIMS]={0};
    H5O_efl_t           efl;
    H5F_t		*f = NULL;
    H5O_pline_t         dcpl_pline;
    H5D_layout_t        dcpl_layout;
    int                 chunk_ndims = 0;
    hsize_t             chunk_size[32]={0};
    H5O_fill_t          fill={NULL,0,NULL};
    H5P_genplist_t *plist;      /* Property list */
    H5P_genplist_t *new_plist;  /* New Property list */

    FUNC_ENTER(H5D_create, NULL);

    /* check args */
    assert (loc);
    assert (name && *name);
    assert (type);
    assert (space);
    assert (TRUE==H5P_isa_class(dcpl_id,H5P_DATASET_CREATE));

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

    if(H5P_get(plist, H5D_CRT_DATA_PIPELINE_NAME, &dcpl_pline) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't retrieve pipeline filter");
    if(H5P_get(plist, H5D_CRT_LAYOUT_NAME, &dcpl_layout) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't retrieve layout");
    if(dcpl_pline.nfilters > 0 && H5D_CHUNKED != dcpl_layout)
        HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, NULL, "filters can only be used with chunked layout");

    /* What file is the dataset being added to? */
    if (NULL==(f=H5G_insertion_file(loc, name)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to locate insertion point");

#ifdef H5_HAVE_PARALLEL
    /* If MPIO is used, no filter support yet. */
    if(IS_H5FD_MPIO(f) && dcpl_pline.nfilters > 0) 
        HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, NULL, "Parallel I/O does not support filters yet");
#endif
    
    /* Initialize the dataset object */
    if(NULL == (new_dset = H5D_new(dcpl_id)))
        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");

    /* Get new dataset's property list object */
    if (NULL == (new_plist = H5I_object(new_dset->dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "can't get dataset creation property list");

    if(H5P_get(new_plist, H5D_CRT_CHUNK_DIM_NAME, &chunk_ndims) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't retrieve layout");
    
    /* Copy datatype for dataset */
    new_dset->type = H5T_copy(type, H5T_COPY_ALL);

    /* Mark any VL datatypes as being on disk now */
    if (H5T_vlen_mark(new_dset->type, f, H5T_VLEN_DISK)<0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "invalid VL location");

    if(H5P_get(new_plist, H5D_CRT_EXT_FILE_LIST_NAME, &efl) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't retrieve external file list");

    /* Total raw data size */
    if(H5P_get(new_plist, H5D_CRT_LAYOUT_NAME, &(new_dset->layout.type)) < 0)
         HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't retrieve layout");
    new_dset->layout.ndims = H5S_get_simple_extent_ndims(space) + 1;
    assert((unsigned)(new_dset->layout.ndims) <= NELMTS(new_dset->layout.dim));
    new_dset->layout.dim[new_dset->layout.ndims-1] = H5T_get_size(new_dset->type);    

    switch (dcpl_layout) {
        case H5D_CONTIGUOUS:
            /*
             * The maximum size of the dataset cannot exceed the storage size.
             * Also, only the slowest varying dimension of a simple data space
             * can be extendible.
             */
	    if ((ndims=H5S_get_simple_extent_dims(space, new_dset->layout.dim,
                                                  max_dim))<0) {
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL,
                    "unable to initialize contiguous storage");
            }
            for (i=1; i<ndims; i++) {
                if (max_dim[i]>new_dset->layout.dim[i])
                    HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "only the first dimension can be extendible");
            }
            if (efl.nused>0) {
                hsize_t max_points = H5S_get_npoints_max (space);
                hsize_t max_storage = H5O_efl_total_size (&efl);

                if (H5S_UNLIMITED==max_points) {
                    if (H5O_EFL_UNLIMITED!=max_storage)
                        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "unlimited data space but finite storage");
                } else if (max_points * H5T_get_size (type) < max_points) {
                    HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "data space * type size overflowed");
                } else if (max_points * H5T_get_size (type) > max_storage) {
                    HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "data space size exceeds external storage size");
                }
            } else if (ndims>0 && max_dim[0]>new_dset->layout.dim[0]) {
                HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, NULL, "extendible contiguous non-external dataset");
            }
            break;

        case H5D_CHUNKED:
            /*
             * Chunked storage allows any type of data space extension, so we
             * don't even bother checking.
             */
            if(chunk_ndims != H5S_get_simple_extent_ndims(space))
                HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, NULL, "dimensionality of chunks doesn't match the data space");
            if (efl.nused>0)
                HGOTO_ERROR (H5E_DATASET, H5E_BADVALUE, NULL, "external storage not supported with chunked layout");

            /*
             * The chunk size of a dimension with a fixed size cannot exceed
             * the maximum dimension size 
             */
            if(H5P_get(new_plist, H5D_CRT_CHUNK_SIZE_NAME, chunk_size) < 0)
                HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't retrieve chunk size");

            if (H5S_get_simple_extent_dims(space, NULL, max_dim)<0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to query maximum dimensions");
            for (u=0; u<new_dset->layout.ndims-1; u++) {
	        if(max_dim[u] != H5S_UNLIMITED && max_dim[u] < chunk_size[u])
                    HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "chunk size must be <= maximum dimension size for fixed-sized dimensions");
            }

            /* Set the dataset's chunk sizes from the property list's chunk sizes */
            for (u=0; u<new_dset->layout.ndims-1; u++)
                new_dset->layout.dim[u] = chunk_size[u];
            break;

        default:
            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, NULL, "not implemented yet");
    } /* end switch */

    /* Create (open for write access) an object header */
    if (H5O_create(f, 256, &(new_dset->ent)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to create dataset object header");

    /* Convert the fill value to the dataset type and write the message */
    if(H5P_get(new_plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't retrieve fill value");
    if (H5O_fill_convert(&fill, new_dset->type) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to convert fill value to dataset type");
    if (fill.buf && H5O_modify(&(new_dset->ent), H5O_FILL, 0, H5O_FLAG_CONSTANT, &fill) < 0) 
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to update fill value header message");        
    if(H5P_set(new_plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, NULL, "can't set fill value");  

    /* Update the type and space header messages */
    if (H5O_modify(&(new_dset->ent), H5O_DTYPE, 0,
            H5O_FLAG_CONSTANT|H5O_FLAG_SHARED, new_dset->type)<0 ||
            H5S_modify(&(new_dset->ent), space) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to update type or space header messages");

    /* Update the filters message */
    if(H5P_get(new_plist, H5D_CRT_DATA_PIPELINE_NAME, &dcpl_pline) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "Can't retrieve pipeline filter");
    if (dcpl_pline.nfilters>0 && H5O_modify (&(new_dset->ent), H5O_PLINE, 0, H5O_FLAG_CONSTANT, &dcpl_pline) < 0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "unable to update filter header message");

    /*
     * Add a modification time message.
     */
    if (H5O_touch(&(new_dset->ent), TRUE)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to update modification time message");
    
    /* Give the dataset a name */
    if (H5G_insert(loc, name, &(new_dset->ent)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to name dataset");

    /*
     * Initialize storage.  We assume that external storage is already
     * initialized by the caller, or at least will be before I/O is performed.
     */
    if (0==efl.nused) {
        if (H5F_arr_create(f, &(new_dset->layout)) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to initialize storage");
    } else {
        new_dset->layout.addr = HADDR_UNDEF;
    }

    /* Update layout message */
    if (H5O_modify (&(new_dset->ent), H5O_LAYOUT, 0, H5O_FLAG_CONSTANT, &(new_dset->layout)) < 0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "unable to update layout message");

    /* Update external storage message */
    if (efl.nused>0) {
        size_t heap_size = H5HL_ALIGN (1);

        for (i=0; i<efl.nused; i++)
            heap_size += H5HL_ALIGN (HDstrlen (efl.slot[i].name)+1);
        if (H5HL_create (f, heap_size, &(efl.heap_addr)/*out*/)<0 ||
                (size_t)(-1)==H5HL_insert(f, efl.heap_addr, 1, ""))
            HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "unable to create external file list name heap");
        for (i=0; i<efl.nused; i++) {
            size_t offset = H5HL_insert(f, efl.heap_addr,
                        HDstrlen(efl.slot[i].name)+1, efl.slot[i].name);
            assert(0==efl.slot[i].name_offset);
            if ((size_t)(-1)==offset)
                HGOTO_ERROR(H5E_EFL, H5E_CANTINIT, NULL, "unable to insert URL into name heap");
            efl.slot[i].name_offset = offset;
        } /* end for */
        if (H5O_modify (&(new_dset->ent), H5O_EFL, 0, H5O_FLAG_CONSTANT, &efl)<0)
            HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "unable to update external file list message");
    } /* end if */

    /* Initialize the raw data */
    if (H5D_init_storage(new_dset, space)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to initialize storage");
    
    /* Success */
    ret_value = new_dset;

done:
    if (!ret_value && new_dset) {
        if (new_dset->type)
            H5T_close(new_dset->type);
        if (H5F_addr_defined(new_dset->ent.header))
            H5O_close(&(new_dset->ent));
        new_dset->ent.file = NULL;
        H5FL_FREE(H5D_t,new_dset);
    }
    FUNC_LEAVE(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_isa
 *
 * Purpose:	Determines if an object has the requisite messages for being
 *		a dataset.
 *
 * Return:	Success:	TRUE if the required dataset messages are
 *				present; FALSE otherwise.
 *
 *		Failure:	FAIL if the existence of certain messages
 *				cannot be determined.
 *
 * Programmer:	Robb Matzke
 *              Monday, November  2, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5D_isa(H5G_entry_t *ent)
{
    htri_t	exists;
    
    FUNC_ENTER(H5D_isa, FAIL);
    assert(ent);

    /* Data type */
    if ((exists=H5O_exists(ent, H5O_DTYPE, 0))<0) {
	HRETURN_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL,
		      "unable to read object header");
    } else if (!exists) {
	HRETURN(FALSE);
    }

    /* Layout */
    if ((exists=H5O_exists(ent, H5O_LAYOUT, 0))<0) {
	HRETURN_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL,
		      "unable to read object header");
    } else if (!exists) {
	HRETURN(FALSE);
    }
    

    
    FUNC_LEAVE(TRUE);
}

/*
 *------------------------------------------------------------------------- 
 * Function:	H5D_open
 *
 * Purpose:	Finds a dataset named NAME in file F and builds a descriptor
 *		for it, opening it for access.
 *
 * Return:	Success:	Pointer to a new dataset descriptor.
 *
 *		Failure:	NULL
 *
 * Errors:
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 * 	Robb Matzke, 9 Jun 1998
 *	The data space message is no longer cached in the dataset struct.
 *	
 *  	Quincey Koziol, 12 Oct 1998
 *  	Moved guts of function into H5D_open_oid
 *
 *-------------------------------------------------------------------------
 */
H5D_t *
H5D_open(H5G_entry_t *loc, const char *name)
{
    H5D_t	*dataset = NULL;	/*the dataset which was found	*/
    H5D_t	*ret_value = NULL;	/*return value			*/
    H5G_entry_t ent;            	/*dataset symbol table entry	*/
    
    FUNC_ENTER(H5D_open, NULL);

    /* check args */
    assert (loc);
    assert (name && *name);
    
    /* Find the dataset object */
    if (H5G_find(loc, name, NULL, &ent) < 0) {
        HGOTO_ERROR(H5E_DATASET, H5E_NOTFOUND, NULL, "not found");
    }
    /* Open the dataset object */
    if ((dataset=H5D_open_oid(&ent)) ==NULL) {
        HGOTO_ERROR(H5E_DATASET, H5E_NOTFOUND, NULL, "not found");
    }

    /* Success */
    ret_value = dataset;

done:
    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * Function:	H5D_open_oid
 *
 * Purpose:	Opens a dataset for access.
 *
 * Return:	Dataset pointer on success, NULL on failure
 *
 * Errors:
 *
 * Programmer:	Quincey Koziol
 *		Monday, October 12, 1998
 *
 * Modifications:
 *
 *              Raymond Lu
 *              Tuesday, October 2, 2001
 *              Changed the way to set property for generic property list.
 *
 *-------------------------------------------------------------------------
 */
H5D_t *
H5D_open_oid(H5G_entry_t *ent)
{
    H5D_t 	*dataset = NULL;	/*new dataset struct 		*/
    H5D_t 	*ret_value = NULL;	/*return value			*/
    H5S_t	*space = NULL;		/*data space			*/
    H5O_fill_t  fill;
    H5O_pline_t pline;   
    H5O_efl_t   efl;
    H5D_layout_t layout;
    int         chunk_ndims;
    H5P_genplist_t *plist;      /* Property list */
    
    FUNC_ENTER(H5D_open_oid, NULL);

    /* check args */
    assert (ent);
    
    /* Allocate the dataset structure */
    if(NULL==(dataset = H5D_new(H5P_DEFAULT)))
        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");

    /* Copy over the symbol table information if it's provided */
    HDmemcpy(&(dataset->ent),ent,sizeof(H5G_entry_t));

    /* Find the dataset object */
    if (H5O_open(&(dataset->ent)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTOPENOBJ, NULL, "unable to open");
    
    /* Get the type and space */
    if (NULL==(dataset->type=H5O_read(&(dataset->ent), H5O_DTYPE, 0, NULL)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to load type info from dataset header");
    if (NULL==(space=H5S_read (&(dataset->ent))))
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, NULL, "unable to read data space info from dataset header");

    /* Get dataset creation property list object */
    if (NULL == (plist = H5I_object(dataset->dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "can't get dataset creation property list");

    /* Get the optional fill value message */
    HDmemset(&fill,0,sizeof(H5O_fill_t));
    if(NULL == H5O_read(&(dataset->ent), H5O_FILL, 0, &fill)) {
        H5E_clear();
        HDmemset(&fill, 0, sizeof(fill));
    }

    if(H5P_set(plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, NULL, "can't set fill value");

    /* Get the optional filters message */
    HDmemset(&pline,0,sizeof(H5O_pline_t));
    if(NULL == H5O_read(&(dataset->ent), H5O_PLINE, 0, &pline)) {
        H5E_clear();
        HDmemset(&pline, 0, sizeof(pline));
    }
    if(H5P_set(plist, H5D_CRT_DATA_PIPELINE_NAME, &pline) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, NULL, "can't set pipeline");

#ifdef H5_HAVE_PARALLEL
    /* If MPIO is used, no filter support yet. */
    if(IS_H5FD_MPIO(dataset->ent.file) && pline.nfilters > 0)
        HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, NULL, "Parallel IO does not support filters yet");
#endif
    
    /*
     * Get the raw data layout info.  It's actually stored in two locations:
     * the storage message of the dataset (dataset->storage) and certain
     * values are copied to the dataset create plist so the user can query
     * them.
     */
    if (NULL==H5O_read(&(dataset->ent), H5O_LAYOUT, 0, &(dataset->layout)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to read data layout message");
    switch (dataset->layout.type) {
        case H5D_CONTIGUOUS:
            layout = H5D_CONTIGUOUS; 
            if(H5P_set(plist, H5D_CRT_LAYOUT_NAME, &layout) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, NULL, "can't set layout"); 
            break;

        case H5D_CHUNKED:
        /*
         * Chunked storage.  The creation plist's dimension is one less than
         * the chunk dimension because the chunk includes a dimension for the
         * individual bytes of the data type.
         */
            layout = H5D_CHUNKED;
            chunk_ndims  = dataset->layout.ndims - 1;
   
            if(H5P_set(plist, H5D_CRT_LAYOUT_NAME, &layout) < 0)
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, NULL, "can't set layout");
            if(H5P_set(plist, H5D_CRT_CHUNK_DIM_NAME, &chunk_ndims) < 0)
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, NULL, "can't set chunk dimensions");
            if(H5P_set(plist, H5D_CRT_CHUNK_SIZE_NAME, dataset->layout.dim) < 0)
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, NULL, "can't set chunk size");
            break;
        default:
            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, NULL, "not implemented yet");
    } /* end switch */

    /* Get the external file list message, which might not exist */
    if( !H5F_addr_defined(dataset->layout.addr) ) {
        HDmemset(&efl,0,sizeof(H5O_efl_t));
        if(NULL == H5O_read(&(dataset->ent), H5O_EFL, 0, &efl))
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "storage address is undefined and no external file list");
        if(H5P_set(plist, H5D_CRT_EXT_FILE_LIST_NAME, &efl) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, NULL, "can't set external file list");
    }
    /*
     * Make sure all storage is properly initialized for chunked datasets.
     * This is especially important for parallel I/O where the B-tree must
     * be fully populated before I/O can happen.
     */
    if ((H5F_get_intent(dataset->ent.file) & H5F_ACC_RDWR) &&
            H5D_CHUNKED==dataset->layout.type) {
        if (H5D_init_storage(dataset, space)<0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to initialize file storage");
    }

    /* Success */
    ret_value = dataset;

done:
    if (space)
        H5S_close(space);
    if (ret_value==NULL && dataset) {
        if (H5F_addr_defined(dataset->ent.header))
            H5O_close(&(dataset->ent));
        if (dataset->type)
            H5T_close(dataset->type);
        dataset->ent.file = NULL;
        H5FL_FREE(H5D_t,dataset);
    }
    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * Function:	H5D_close
 *
 * Purpose:	Insures that all data has been saved to the file, closes the
 *		dataset object header, and frees all resources used by the
 *		descriptor.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Errors:
 *		DATASET	  CANTINIT	Couldn't free the type or space,
 *					but the dataset was freed anyway. 
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 *	Robb Matzke, 9 Jun 1998
 *	The data space message is no longer cached in the dataset struct.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_close(H5D_t *dataset)
{
    unsigned		    free_failed;

    FUNC_ENTER(H5D_close, FAIL);

    /* check args */
    assert(dataset && dataset->ent.file);

    /*
     * Release data type and creation property list -- there isn't much we
     * can do if one of these fails, so we just continue.
     */
    free_failed = (H5T_close(dataset->type) < 0 ||
			H5I_dec_ref(dataset->dcpl_id) < 0);

    /* Close the dataset object */
    H5O_close(&(dataset->ent));

    /*
     * Free memory.  Before freeing the memory set the file pointer to NULL.
     * We always check for a null file pointer in other H5D functions to be
     * sure we're not accessing an already freed dataset (see the assert()
     * above).
     */
    dataset->ent.file = NULL;
    H5FL_FREE(H5D_t,dataset);

    if (free_failed)
	HRETURN_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "couldn't free the type or creation property list, but the dataset was freed anyway.");

    FUNC_LEAVE(SUCCEED);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_read
 *
 * Purpose:	Reads (part of) a DATASET into application memory BUF. See
 *		H5Dread() for complete details.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 *	Robb Matzke, 1998-06-09
 *	The data space is no longer cached in the dataset struct.
 *
 * 	Robb Matzke, 1998-08-11
 *	Added timing calls around all the data space I/O functions.
 *
 * 	rky, 1998-09-18
 *	Added must_convert to do non-optimized read when necessary.
 *
 *  	Quincey Koziol, 1999-07-02
 *	Changed xfer_parms parameter to xfer plist parameter, so it
 *	could be passed to H5T_convert.
 *
 *	Albert Cheng, 2000-11-21
 *	Added the code that when it detects it is not safe to process a
 *	COLLECTIVE read request without hanging, it changes it to
 *	INDEPENDENT calls.
 *
 *	Albert Cheng, 2000-11-27
 *	Changed to use the optimized MPIO transfer for Collective calls only.
 *
 *      Raymond Lu, 2001-10-2
 *      Changed the way to retrieve property for generic property list.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_read(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
	 const H5S_t *file_space, hid_t dxpl_id, void *buf/*out*/)
{
    hssize_t    nelmts;			    /*number of elements	*/
    hsize_t		smine_start;		/*strip mine start loc	*/
    hsize_t		n, smine_nelmts;	/*elements per strip	*/
    uint8_t		*tconv_buf = NULL;	/*data type conv buffer	*/
    uint8_t		*bkg_buf = NULL;	/*background buffer	*/
    H5T_path_t	*tpath = NULL;		/*type conversion info	*/
    hid_t		src_id = -1, dst_id = -1;/*temporary type atoms */
    H5S_conv_t	*sconv=NULL;	    /*space conversion funcs*/
    H5S_sel_iter_t 	mem_iter;       /*mem selection iteration info*/
    H5S_sel_iter_t	bkg_iter;	    /*background iteration info*/
    H5S_sel_iter_t	file_iter;      /*file selection iter info*/
    herr_t		ret_value = SUCCEED;	/*return value		*/
    herr_t		status;			    /*function return status*/
    size_t		src_type_size;		/*size of source type	*/
    size_t		dst_type_size;	    /*size of destination type*/
    size_t		target_size;		/*desired buffer size	*/
    hsize_t		request_nelmts;		/*requested strip mine	*/
    H5T_bkg_t	need_bkg;		    /*type of background buf*/
    H5S_t		*free_this_space=NULL;  /*data space to free	*/
    hbool_t     must_convert;       /*have to xfer the slow way*/
#ifdef H5_HAVE_PARALLEL
    H5FD_mpio_dxpl_t	*dx = NULL;
    H5FD_mpio_xfer_t	xfer_mode;		/*xfer_mode for this request */
    hbool_t		xfer_mode_changed=0;	/*xfer_mode needs restore */
    hbool_t		doing_mpio=0;		/*This is an MPIO access */
#endif
#ifdef H5S_DEBUG
    H5_timer_t		timer;
#endif
    H5O_pline_t         pline;
    H5O_efl_t           efl;
    H5O_fill_t          fill;    
    H5P_genplist_t *dx_plist=NULL;      /* Property list */
    H5P_genplist_t *dc_plist;      /* Property list */
    

    FUNC_ENTER(H5D_read, FAIL);

    /* check args */
    assert(dataset && dataset->ent.file);
    assert(mem_type);
    assert(buf);
    assert(H5I_GENPROP_LST==H5I_get_type(dxpl_id));
    assert(TRUE==H5P_isa_class(dxpl_id,H5P_DATASET_XFER));

    /* Get the dataset's creation property list */
    if (NULL == (dc_plist = H5I_object(dataset->dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");

    /* Get the dataset transfer property list */
    if (NULL == (dx_plist = H5I_object(dxpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");

    /* Initialize these before any errors can occur */
    HDmemset(&mem_iter,0,sizeof(H5S_sel_iter_t));
    HDmemset(&bkg_iter,0,sizeof(H5S_sel_iter_t));
    HDmemset(&file_iter,0,sizeof(H5S_sel_iter_t));

    if (!file_space) {
        if (NULL==(free_this_space=H5S_read (&(dataset->ent))))
            HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to read data space from dataset header");
        file_space = free_this_space;
    } /* end if */
    if (!mem_space)
        mem_space = file_space;
    nelmts = H5S_get_select_npoints(mem_space);

#ifdef H5_HAVE_PARALLEL
    /* Collect Parallel I/O information for possible later use */
    if (H5FD_MPIO==H5P_peek_hid_t(dx_plist,H5D_XFER_VFL_ID_NAME)) {
	doing_mpio++;
	if (dx=H5P_peek_voidp(dx_plist,H5D_XFER_VFL_INFO_NAME))
	    xfer_mode = dx->xfer_mode;
	else
	    HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to retrieve data xfer info");
    } /* end if */
    /* Collective access is not permissible without the MPIO driver */
    if (doing_mpio && xfer_mode==H5FD_MPIO_COLLECTIVE &&
            !(IS_H5FD_MPIO(dataset->ent.file)))
        HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, FAIL, "collective access for MPIO driver only");
#endif

#ifdef QAK
printf("%s: check 1.0, nelmts=%d, H5S_get_select_npoints(file_space)=%d\n",FUNC,(int)nelmts,(int)H5S_get_select_npoints(file_space));
#endif /* QAK */
    /* Make certain that the number of elements in each selection is the same */
    if (nelmts!=H5S_get_select_npoints (file_space))
        HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "src and dest data spaces have different sizes");

    /*
     * Locate the type conversion function and data space conversion
     * functions, and set up the element numbering information. If a data
     * type conversion is necessary then register data type atoms. Data type
     * conversion is necessary if the user has set the `need_bkg' to a high
     * enough value in xfer_parms since turning off data type conversion also
     * turns off background preservation.
     */
    if (NULL==(tpath=H5T_path_find(dataset->type, mem_type, NULL, NULL))) {
        HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dest data types");
    } else if (!H5T_IS_NOOP(tpath)) {
        if ((src_id=H5I_register(H5I_DATATYPE, H5T_copy(dataset->type, H5T_COPY_ALL)))<0 ||
                (dst_id=H5I_register(H5I_DATATYPE, H5T_copy(mem_type, H5T_COPY_ALL)))<0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "unable to register types for conversion");
    } /* end if */

    /* Get dataspace functions */
    if (NULL==(sconv=H5S_find(mem_space, file_space)))
        HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to convert from file to memory data space");

#ifdef H5_HAVE_PARALLEL
    /* rky 980813 This is a temporary KLUGE.
     * The sconv functions should be set by H5S_find,
     * or we should use a different way to call the MPI-IO
     * mem-and-file-dataspace-xfer functions
     * (the latter in case the arguments to sconv_funcs
     * turn out to be inappropriate for MPI-IO).  */
    if (H5_mpi_opt_types_g && IS_H5FD_MPIO(dataset->ent.file)) {
	/* Only collective write should call this since it eventually
	 * calls MPI_File_set_view which is a collective call.
	 * See H5S_mpio_spaces_xfer() for details.
	 */
	if (doing_mpio && xfer_mode==H5FD_MPIO_COLLECTIVE)
	    sconv->read = H5S_mpio_spaces_read;
    } /* end if */
#endif /*H5_HAVE_PARALLEL*/

#ifdef QAK
printf("%s: check 1.1, \n",FUNC);
#endif /* QAK */
    /*
     * If there is no type conversion then try reading directly into the
     * application's buffer.  This saves at least one mem-to-mem copy.
     */
    if (H5T_IS_NOOP(tpath) && sconv->read) {
#ifdef H5S_DEBUG
	H5_timer_begin(&timer);
#endif
        if(H5P_get(dc_plist, H5D_CRT_DATA_PIPELINE_NAME, &pline) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get pipeline");
        if(H5P_get(dc_plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve fill value");
        if(H5P_get(dc_plist, H5D_CRT_EXT_FILE_LIST_NAME, &efl) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get external file list");
        status = (sconv->read)(dataset->ent.file, &(dataset->layout), &pline, 
                       &fill, &efl, H5T_get_size(dataset->type), file_space, 
                       mem_space, dxpl_id, buf/*out*/, &must_convert);

        /* Supports only no conversion, type or space, for now. */
        if (status<0)
            HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "optimized read failed");

        if (must_convert) {
            /* sconv->read cannot do a direct transfer;
             * fall through and xfer the data in the more roundabout way */
        } else {
            /* direct xfer accomplished successfully */
#ifdef H5S_DEBUG
            H5_timer_end(&(sconv->stats[1].read_timer), &timer);
            sconv->stats[1].read_nbytes += nelmts *
                           H5T_get_size(dataset->type);
            sconv->stats[1].read_ncalls++;
#endif
            HGOTO_DONE(SUCCEED);
        } /* end else */
#ifdef H5D_DEBUG
        if (H5DEBUG(D)) {
            fprintf (H5DEBUG(D), "H5D: data space conversion could not be "
                 "optimized for this case (using general method instead)\n");
        } /* end if */
#endif
        H5E_clear ();
    } /* end if */
	
#ifdef QAK
printf("%s: check 1.2, \n",FUNC);
#endif /* QAK */
#ifdef H5_HAVE_PARALLEL
    /* The following may not handle a collective call correctly
     * since it does not ensure all processes can handle the read
     * request according to the MPI collective specification.
     * Do the collective request via independent mode.
     */
    if (doing_mpio && xfer_mode==H5FD_MPIO_COLLECTIVE) {
	/* Kludge: change the xfer_mode to independent, handle the request,
	 * then xfer_mode before return.
	 * Better way is to get a temporary data_xfer property with
	 * INDEPENDENT xfer_mode and pass it downwards.
	 */
	dx->xfer_mode = H5FD_MPIO_INDEPENDENT;
	xfer_mode_changed++;	/* restore it before return */
#ifdef H5D_DEBUG
	if (H5DEBUG(D)) {
	    fprintf(H5DEBUG(D),
		"H5D: Cannot handle this COLLECTIVE read request.  Do it via INDEPENDENT calls\n"
		"dx->xfermode was %d, changed to %d\n",
		xfer_mode, dx->xfer_mode);
	} /* end if */
#endif
    } /* end if */
#endif
    /*
     * This is the general case.
     */

    /* Compute element sizes and other parameters */
    src_type_size = H5T_get_size(dataset->type);
    dst_type_size = H5T_get_size(mem_type);
    target_size = H5P_peek_size_t(dx_plist,H5D_XFER_MAX_TEMP_BUF_NAME);
#ifdef QAK
printf("%s: check 2.0, src_type_size=%d, dst_type_size=%d, target_size=%d, min_elem_out=%d\n",FUNC,(int)src_type_size,(int)dst_type_size,(int)target_size,(int)min_elem_out);
#endif /* QAK */
    request_nelmts = target_size / MAX(src_type_size, dst_type_size);

    /* Figure out the strip mine size. */
    if ((sconv->f->init)(file_space, src_type_size, &file_iter)<0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize file selection information");
    if ((sconv->m->init)(mem_space, dst_type_size, &mem_iter)<0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize memory selection information");
    if ((sconv->m->init)(mem_space, dst_type_size, &bkg_iter)<0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize background selection information");

#ifdef QAK
    printf("%s: check 3.0, request_nelmts=%d\n",FUNC,(int)request_nelmts);
#endif
    if (request_nelmts<=0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "temporary buffer max size is too small");

    /*
     * Get a temporary buffer for type conversion unless the app has already
     * supplied one through the xfer properties. Instead of allocating a
     * buffer which is the exact size, we allocate the target size.  The
     * malloc() is usually less resource-intensive if we allocate/free the
     * same size over and over.
     */
    if (tpath->cdata.need_bkg) {
        /* Retrieve the bkgr buffer property */
        if(H5P_get(dx_plist, H5D_XFER_BKGR_BUF_TYPE_NAME, &need_bkg)<0)
            HGOTO_ERROR (H5E_PLIST, H5E_CANTGET, FAIL, "Can't retrieve background buffer type");
        need_bkg = MAX(tpath->cdata.need_bkg, need_bkg);
    } else {
        need_bkg = H5T_BKG_NO; /*never needed even if app says yes*/
    } /* end else */
    if (NULL==(tconv_buf=H5P_peek_voidp(dx_plist,H5D_XFER_TCONV_BUF_NAME))) {
#ifdef QAK
    printf("%s: check 3.1, allocating conversion buffer\n",FUNC);
#endif
        /* Allocate temporary buffer */
        if((tconv_buf=H5FL_BLK_ALLOC(type_conv,target_size,0))==NULL)
            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion");
    } /* end if */
    if (need_bkg && NULL==(bkg_buf=H5P_peek_voidp(dx_plist,H5D_XFER_BKGR_BUF_NAME))) {
#ifdef QAK
    printf("%s: check 3.2, allocating conversion buffer\n",FUNC);
#endif
        /* Allocate temporary buffer */
        H5_CHECK_OVERFLOW((request_nelmts*dst_type_size),hsize_t,size_t);
        if((bkg_buf=H5FL_BLK_ALLOC(bkgr_conv,(size_t)(request_nelmts*dst_type_size),0))==NULL)
            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for background conversion");
    } /* end if */

#ifdef QAK
    printf("%s: check 4.0, nelmts=%d, need_bkg=%d\n", FUNC,(int)nelmts,(int)need_bkg);
#endif

    /* Get some necessary information for later */
    if(H5P_get(dc_plist, H5D_CRT_DATA_PIPELINE_NAME, &pline) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve data pipeline");
    if(H5P_get(dc_plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve fill value");
    if(H5P_get(dc_plist, H5D_CRT_EXT_FILE_LIST_NAME, &efl) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve external file list");
    
    /* Start strip mining... */
    H5_CHECK_OVERFLOW(nelmts,hssize_t,hsize_t);
    for (smine_start=0; smine_start<(hsize_t)nelmts; smine_start+=smine_nelmts) {
        /* Go figure out how many elements to read from the file */
        smine_nelmts = (sconv->f->avail)(file_space,&file_iter,
                 MIN(request_nelmts, (nelmts-smine_start)));
#ifdef QAK
	printf("%s: check 5.0, nelmts=%d, smine_start=%d, smine_nelmts=%d\n", FUNC,(int)nelmts,(int)smine_start,(int)smine_nelmts);
#endif
	
        /*
         * Gather the data from disk into the data type conversion
         * buffer. Also gather data from application to background buffer
         * if necessary.
         */
#ifdef H5S_DEBUG
	H5_timer_begin(&timer);
#endif
        n = (sconv->f->gath)(dataset->ent.file, &(dataset->layout), &pline, 
                             &fill, &efl, src_type_size, file_space, 
                             &file_iter, smine_nelmts, dxpl_id, 
                             tconv_buf/*out*/);


#ifdef H5S_DEBUG
	H5_timer_end(&(sconv->stats[1].gath_timer), &timer);
	sconv->stats[1].gath_nbytes += n * src_type_size;
	sconv->stats[1].gath_ncalls++;
#endif
	if (n!=smine_nelmts)
            HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file gather failed");
	
#ifdef QAK
	printf("%s: check 6.0\n",FUNC);
#ifdef QAK
	{
	    int i;
	    float *b;

	    /* if(qak_debug) { */
		printf("\ntconv_buf:");
		b=(float*)(tconv_buf+sizeof(float)*(32770-8));
		for (i=(32770-8); i<32770; i++,b++) {
		    printf("(%d)%f ",i,(float)*b);
		}
		printf("\n");
	    /* } */
	}
#endif /* QAK */
#endif /* QAK */
	
        if (H5T_BKG_YES==need_bkg) {
#ifdef H5S_DEBUG
            H5_timer_begin(&timer);
#endif
            n = (sconv->m->gath)(buf, dst_type_size, mem_space, &bkg_iter,
				 smine_nelmts, bkg_buf/*out*/);
#ifdef H5S_DEBUG
            H5_timer_end(&(sconv->stats[1].bkg_timer), &timer);
            sconv->stats[1].bkg_nbytes += n * dst_type_size;
            sconv->stats[1].bkg_ncalls++;
#endif
            if (n!=smine_nelmts)
                HGOTO_ERROR (H5E_IO, H5E_READERROR, FAIL, "mem gather failed");
        } else if (need_bkg) {
            assert((request_nelmts*dst_type_size)==(hsize_t)((size_t)(request_nelmts*dst_type_size))); /*check for overflow*/
            HDmemset(bkg_buf, 0, (size_t)(request_nelmts*dst_type_size));
        }
	
#ifdef QAK
	printf("%s: check 7.0\n",FUNC);
#endif

        /*
         * Perform data type conversion.
         */
        if (H5T_convert(tpath, src_id, dst_id, smine_nelmts, 0, 0, tconv_buf, bkg_buf, dxpl_id)<0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "data type conversion failed");

#ifdef QAK
	printf("%s: check 8.0\n",FUNC);
#ifdef QAK
	{
	    int i;
	    double *b;

	    /* if(qak_debug) { */
		printf("\ntconv_buf:");
		b=(double*)(tconv_buf+sizeof(double)*(32770-8));
		for (i=(32770-8); i<32770; i++,b++) {
		    printf("(%d)%f ",i,(double)*b);
		}
		printf("\n");
	    /* } */
	}
#endif /* QAK */
#endif
	
        /*
         * Scatter the data into memory.
         */
#ifdef H5S_DEBUG
	H5_timer_begin(&timer);
#endif
        status = (sconv->m->scat)(tconv_buf, dst_type_size, mem_space,
				  &mem_iter, smine_nelmts, buf/*out*/);
#ifdef H5S_DEBUG
	H5_timer_end(&(sconv->stats[1].scat_timer), &timer);
	sconv->stats[1].scat_nbytes += smine_nelmts * dst_type_size;
	sconv->stats[1].scat_ncalls++;
#endif
	if (status<0)
            HGOTO_ERROR (H5E_IO, H5E_READERROR, FAIL, "scatter failed");
	
#ifdef QAK
	printf("%s: check 9.0\n",FUNC);
#endif /* QAK */
    } /* end for */
    
done:
#ifdef H5_HAVE_PARALLEL
    /* restore xfer_mode due to the kludge */
    if (doing_mpio && xfer_mode_changed) {
#ifdef H5D_DEBUG
	if (H5DEBUG(D)) {
	    fprintf (H5DEBUG(D), "H5D: dx->xfermode was %d, restored to %d\n",
		dx->xfer_mode, xfer_mode);
	} /* end if */
#endif
	dx->xfer_mode = xfer_mode;
    } /* end if */
#endif
    /* Release selection iterators */
    H5S_sel_iter_release(file_space,&file_iter);
    H5S_sel_iter_release(mem_space,&mem_iter);
    H5S_sel_iter_release(mem_space,&bkg_iter);

    if (src_id >= 0)
        H5I_dec_ref(src_id);
    if (dst_id >= 0)
        H5I_dec_ref(dst_id);
    assert(dx_plist);
    if (tconv_buf && NULL==H5P_peek_voidp(dx_plist,H5D_XFER_TCONV_BUF_NAME))
        H5FL_BLK_FREE(type_conv,tconv_buf);
    if (bkg_buf && NULL==H5P_peek_voidp(dx_plist,H5D_XFER_BKGR_BUF_NAME))
        H5FL_BLK_FREE(bkgr_conv,bkg_buf);
    if (free_this_space)
        H5S_close(free_this_space);
    FUNC_LEAVE(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_write
 *
 * Purpose:	Writes (part of) a DATASET to a file from application memory
 *		BUF. See H5Dwrite() for complete details.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 * Modifications:
 * 	Robb Matzke, 9 Jun 1998
 *	The data space is no longer cached in the dataset struct.
 *
 * 	rky 980918
 *	Added must_convert to do non-optimized read when necessary.
 *
 *      Quincey Koziol, 2 July 1999
 *      Changed xfer_parms parameter to xfer plist parameter, so it could
 *      be passed to H5T_convert
 *
 *	Albert Cheng, 2000-11-21
 *	Added the code that when it detects it is not safe to process a
 *	COLLECTIVE write request without hanging, it changes it to
 *	INDEPENDENT calls.
 *      
 *	Albert Cheng, 2000-11-27
 *	Changed to use the optimized MPIO transfer for Collective calls only.
 *
 *      Raymond Lu, 2001-10-2
 *      Changed the way to retrieve property for generic property list.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_write(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
	  const H5S_t *file_space, hid_t dxpl_id, const void *buf)
{
    hssize_t	nelmts;			    /*total number of elmts	*/
    hsize_t		smine_start;		/*strip mine start loc	*/
    hsize_t		n, smine_nelmts;	/*elements per strip	*/
    uint8_t		*tconv_buf = NULL;	/*data type conv buffer	*/
    uint8_t		*bkg_buf = NULL;	/*background buffer	*/
    H5T_path_t	*tpath = NULL;		/*type conversion info	*/
    hid_t		src_id = -1, dst_id = -1;/*temporary type atoms */
    H5S_conv_t	*sconv=NULL;		/*space conversion funcs*/
    H5S_sel_iter_t	mem_iter;       /*memory selection iteration info*/
    H5S_sel_iter_t	bkg_iter;       /*background iteration info*/
    H5S_sel_iter_t	file_iter;      /*file selection iteration info*/
    herr_t		ret_value = SUCCEED;	/*return value		*/
    herr_t		status;			    /*function return status*/
    size_t		src_type_size;		/*size of source type	*/
    size_t		dst_type_size;	    /*size of destination type*/
    size_t		target_size;		/*desired buffer size	*/
    hsize_t		request_nelmts;		/*requested strip mine	*/
    H5T_bkg_t	need_bkg;		    /*type of background buf*/
    H5S_t		*free_this_space=NULL;	/*data space to free	*/
    hbool_t     must_convert;       /*have to xfer the slow way*/
#ifdef H5_HAVE_PARALLEL
    H5FD_mpio_dxpl_t	*dx = NULL;
    H5FD_mpio_xfer_t	xfer_mode;		/*xfer_mode for this request */
    hbool_t		xfer_mode_changed=0;	/*xfer_mode needs restore */
    hbool_t		doing_mpio=0;		/*This is an MPIO access */
#endif
#ifdef H5S_DEBUG
    H5_timer_t		timer;
#endif
    H5O_pline_t         pline;
    H5O_efl_t           efl;
    H5O_fill_t          fill;    
    H5P_genplist_t *dx_plist=NULL;      /* Property list */
    H5P_genplist_t *dc_plist;      /* Property list */

    FUNC_ENTER(H5D_write, FAIL);

    /* check args */
    assert(dataset && dataset->ent.file);
    assert(mem_type);
    assert(buf);
    assert(H5I_GENPROP_LST==H5I_get_type(dxpl_id));
    assert(TRUE==H5P_isa_class(dxpl_id,H5P_DATASET_XFER));

    /* Get the dataset's creation property list */
    if (NULL == (dc_plist = H5I_object(dataset->dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");

    /* Get the dataset transfer property list */
    if (NULL == (dx_plist = H5I_object(dxpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");

#ifdef H5_HAVE_PARALLEL
    /* If MPIO is used, no VL datatype support yet. */
    /* This is because they use the global heap in the file and we don't */
    /* support parallel access of that yet */
    if (IS_H5FD_MPIO(dataset->ent.file) && H5T_get_class(mem_type)==H5T_VLEN)
        HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, FAIL, "Parallel IO does not support writing VL datatypes yet");
#endif
#ifdef H5_HAVE_PARALLEL
    /* If MPIO is used, no dataset region reference support yet. */
    /* This is because they use the global heap in the file and we don't */
    /* support parallel access of that yet */
    if (IS_H5FD_MPIO(dataset->ent.file) &&
            H5T_get_class(mem_type)==H5T_REFERENCE &&
            H5T_get_ref_type(mem_type)==H5R_DATASET_REGION)
        HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, FAIL, "Parallel IO does not support writing VL datatypes yet");
#endif

    /* Initialize these before any errors can occur */
    HDmemset(&mem_iter,0,sizeof(H5S_sel_iter_t));
    HDmemset(&bkg_iter,0,sizeof(H5S_sel_iter_t));
    HDmemset(&file_iter,0,sizeof(H5S_sel_iter_t));
#ifdef QAK
    printf("%s: check 0.3, buf=%p\n", FUNC,buf);
#endif /* QAK */

    if (0==(H5F_get_intent(dataset->ent.file) & H5F_ACC_RDWR))
	HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "no write intent on file");

    if (!file_space) {
	if (NULL==(free_this_space=H5S_read (&(dataset->ent))))
	    HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to read data space from dataset header");
	file_space = free_this_space;
    } /* end if */
    if (!mem_space)
        mem_space = file_space;
    nelmts = H5S_get_select_npoints(mem_space);

#ifdef H5_HAVE_PARALLEL
    /* Collect Parallel I/O information for possible later use */
    if (H5FD_MPIO==H5P_peek_hid_t(dx_plist,H5D_XFER_VFL_ID_NAME)) {
	doing_mpio++;
	if (dx=H5P_peek_voidp(dx_plist,H5D_XFER_VFL_INFO_NAME))
	    xfer_mode = dx->xfer_mode;
	else
	    HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to retrieve data xfer info");
    } /* end if */
    /* Collective access is not permissible without the MPIO driver */
    if (doing_mpio && xfer_mode==H5FD_MPIO_COLLECTIVE &&
            !(IS_H5FD_MPIO(dataset->ent.file)))
        HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, FAIL, "collective access for MPIO driver only");
#endif

#ifdef QAK
    printf("%s: check 0.5, nelmts=%d, mem_space->rank=%d\n", FUNC, (int)nelmts, mem_space->extent.u.simple.rank);
#endif /* QAK */
    /* Make certain that the number of elements in each selection is the same */
    if (nelmts!=H5S_get_select_npoints (file_space))
	HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "src and dest data spaces have different sizes");

    /*
     * Locate the type conversion function and data space conversion
     * functions, and set up the element numbering information. If a data
     * type conversion is necessary then register data type atoms. Data type
     * conversion is necessary if the user has set the `need_bkg' to a high
     * enough value in xfer_parms since turning off data type conversion also
     * turns off background preservation.
     */
    if (NULL==(tpath=H5T_path_find(mem_type, dataset->type, NULL, NULL))) {
	HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dest data types");
    } else if (!H5T_IS_NOOP(tpath)) {
	if ((src_id = H5I_register(H5I_DATATYPE, H5T_copy(mem_type, H5T_COPY_ALL)))<0 ||
                (dst_id = H5I_register(H5I_DATATYPE, H5T_copy(dataset->type, H5T_COPY_ALL)))<0)
	    HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "unable to register types for conversion");
    } /* end if */
#ifdef QAK
    printf("%s: check 0.6, after H5T_find, tpath=%p, tpath->name=%s\n",FUNC,tpath,tpath->name);
#endif /* QAK */

    /* Get dataspace functions */
    if (NULL==(sconv=H5S_find(mem_space, file_space)))
	HGOTO_ERROR (H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to convert from memory to file data space");

#ifdef H5_HAVE_PARALLEL
    /* rky 980813 This is a temporary KLUGE.
     * The sconv functions should be set by H5S_find,
     * or we should use a different way to call the MPI-IO
     * mem-and-file-dataspace-xfer functions
     * (the latter in case the arguments to sconv_funcs
     * turn out to be inappropriate for MPI-IO).  */
    if (H5_mpi_opt_types_g &&
            IS_H5FD_MPIO(dataset->ent.file)) {
	/* Only collective write should call this since it eventually
	 * calls MPI_File_set_view which is a collective call.
	 * See H5S_mpio_spaces_xfer() for details.
	 */
	if (doing_mpio && xfer_mode==H5FD_MPIO_COLLECTIVE)
	    sconv->write = H5S_mpio_spaces_write;
    } /* end if */
#endif /*H5_HAVE_PARALLEL*/
    
    /*
     * If there is no type conversion then try writing directly from
     * application buffer to file.
     */
#ifdef QAK
    printf("%s: check 0.7, H5T_IS_NOOP(path)=%d, sconv->write=%p\n", FUNC, (int)H5T_IS_NOOP(tpath), sconv->write);
#endif /* QAK */
    if (H5T_IS_NOOP(tpath) && sconv->write) {
#ifdef H5S_DEBUG
	H5_timer_begin(&timer);
#endif
        if(H5P_get(dc_plist, H5D_CRT_DATA_PIPELINE_NAME, &pline) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get pipeline");
        if(H5P_get(dc_plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve fill value");
        if(H5P_get(dc_plist, H5D_CRT_EXT_FILE_LIST_NAME, &efl) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get external file list");
        status = (sconv->write)(dataset->ent.file, &(dataset->layout), &pline, 
                        &fill, &efl, H5T_get_size(dataset->type), file_space,
                        mem_space, dxpl_id, buf/*out*/, &must_convert);

        /* Supports only no conversion, type or space, for now. */
        if (status<0)
	    HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "optimized write failed");
	if (must_convert) {
	    /* sconv->write cannot do a direct transfer;
	     * fall through and xfer the data in the more roundabout way */
	} else {
	    /* direct xfer accomplished successfully */
#ifdef H5S_DEBUG
	    H5_timer_end(&(sconv->stats[0].write_timer), &timer);
	    sconv->stats[0].write_nbytes += nelmts * H5T_get_size(mem_type);
	    sconv->stats[0].write_ncalls++;
#endif
	    HGOTO_DONE(SUCCEED);
	} /* end else */
#ifdef H5D_DEBUG
	if (H5DEBUG(D)) {
	    fprintf (H5DEBUG(D), "H5D: data space conversion could not be "
		     "optimized for this case (using general method "
		     "instead)\n");
	} /* end if */
#endif
	H5E_clear ();
    } /* end if */

#ifdef H5_HAVE_PARALLEL
    /* The following may not handle a collective call correctly
     * since it does not ensure all processes can handle the write
     * request according to the MPI collective specification.
     * Do the collective request via independent mode.
     */
    if (doing_mpio && xfer_mode==H5FD_MPIO_COLLECTIVE) {
	/* Kludge: change the xfer_mode to independent, handle the request,
	 * then xfer_mode before return.
	 * Better way is to get a temporary data_xfer property with
	 * INDEPENDENT xfer_mode and pass it downwards.
	 */
	dx->xfer_mode = H5FD_MPIO_INDEPENDENT;
	xfer_mode_changed++;	/* restore it before return */
#ifdef H5D_DEBUG
	if (H5DEBUG(D)) {
	    fprintf(H5DEBUG(D),
		"H5D: Cannot handle this COLLECTIVE write request.  Do it via INDEPENDENT calls\n"
		"dx->xfermode was %d, changed to %d\n", xfer_mode, dx->xfer_mode);
	} /* end if */
#endif
    } /* end if */
#endif
    /*
     * This is the general case.
     */

    /* Compute element sizes and other parameters */
    src_type_size = H5T_get_size(mem_type);
    dst_type_size = H5T_get_size(dataset->type);
    target_size = H5P_peek_size_t(dx_plist,H5D_XFER_MAX_TEMP_BUF_NAME);
#ifdef QAK
printf("%s: check 2.0, src_type_size=%d, dst_type_size=%d, target_size=%d\n",FUNC,(int)src_type_size,(int)dst_type_size,(int)target_size);
#endif /* QAK */
    request_nelmts = target_size / MAX (src_type_size, dst_type_size);
#ifdef QAK
    printf("%s: check 3.0, request_nelmts=%d, tpath->cdata.need_bkg=%d\n",FUNC,(int)request_nelmts,(int)tpath->cdata.need_bkg);
#endif
    if (request_nelmts<=0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "temporary buffer max size is too small");

    /* Figure out the strip mine size. */
    if ((sconv->f->init)(file_space, dst_type_size, &file_iter)<0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize file selection information");
    if ((sconv->m->init)(mem_space, src_type_size, &mem_iter)<0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize memory selection information");
    if ((sconv->f->init)(file_space, dst_type_size, &bkg_iter)<0)
        HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize background selection information");
     
    /*
     * Get a temporary buffer for type conversion unless the app has already
     * supplied one through the xfer properties.  Instead of allocating a
     * buffer which is the exact size, we allocate the target size. The
     * malloc() is usually less resource-intensive if we allocate/free the
     * same size over and over.
     */
    if (tpath->cdata.need_bkg) {
        /* Retrieve the bkgr buffer property */
        if(H5P_get(dx_plist, H5D_XFER_BKGR_BUF_TYPE_NAME, &need_bkg)<0)
            HGOTO_ERROR (H5E_PLIST, H5E_CANTGET, FAIL, "Can't retrieve background buffer type");
        need_bkg = MAX (tpath->cdata.need_bkg, need_bkg);
    } else {
        need_bkg = H5T_BKG_NO; /*never needed even if app says yes*/
    } /* end else */
    if (NULL==(tconv_buf=H5P_peek_voidp(dx_plist,H5D_XFER_TCONV_BUF_NAME))) {
        /* Allocate temporary buffer */
        if((tconv_buf=H5FL_BLK_ALLOC(type_conv,target_size,0))==NULL)
            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion");
    } /* end if */
    if (need_bkg && NULL==(bkg_buf=H5P_peek_voidp(dx_plist,H5D_XFER_BKGR_BUF_NAME))) {
        /* Allocate temporary buffer */
        H5_CHECK_OVERFLOW((request_nelmts*dst_type_size),hsize_t,size_t);
        if((bkg_buf=H5FL_BLK_ALLOC(bkgr_conv,(size_t)(request_nelmts*dst_type_size),0))==NULL)
            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for background conversion");
    } /* end if */

#ifdef QAK
    printf("%s: check 4.0, nelmts=%d, request_nelmts=%d, need_bkg=%d\n", FUNC,(int)nelmts,(int)request_nelmts,(int)need_bkg);
#endif

    /* Get some necessary information for later */
    if(H5P_get(dc_plist, H5D_CRT_DATA_PIPELINE_NAME, &pline) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get data pipeline");
    if(H5P_get(dc_plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get fill value");
    if(H5P_get(dc_plist, H5D_CRT_EXT_FILE_LIST_NAME, &efl) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get external file list");

    /* Start strip mining... */
    H5_CHECK_OVERFLOW(nelmts,hssize_t,hsize_t);
    for (smine_start=0; smine_start<(hsize_t)nelmts; smine_start+=smine_nelmts) {
        /* Go figure out how many elements to read from the file */
        smine_nelmts = (sconv->f->avail)(file_space,&file_iter,
                 MIN(request_nelmts, (nelmts-smine_start)));
	
#ifdef QAK
	printf("%s: check 5.0, nelmts=%d, smine_start=%d, smine_nelmts=%d\n", FUNC,(int)nelmts,(int)smine_start,(int)smine_nelmts);
#endif
	
        /*
         * Gather data from application buffer into the data type conversion
         * buffer. Also gather data from the file into the background buffer
         * if necessary.
         */
#ifdef H5S_DEBUG
	H5_timer_begin(&timer);
#endif
        n = (sconv->m->gath)(buf, src_type_size, mem_space, &mem_iter,
			     smine_nelmts, tconv_buf/*out*/);
#ifdef H5S_DEBUG
	H5_timer_end(&(sconv->stats[0].gath_timer), &timer);
	sconv->stats[0].gath_nbytes += n * src_type_size;
	sconv->stats[0].gath_ncalls++;
#endif
        if (n!=smine_nelmts)
            HGOTO_ERROR (H5E_IO, H5E_WRITEERROR, FAIL, "mem gather failed");

#ifdef QAK
#ifdef QAK
	{
	    int i;
	    uint16_t *b;

	    if(qak_debug) {
		b=tconv_buf;
		printf("\ntconv_buf:");
		for (i=0; i<smine_nelmts; i++,b++) {
		    printf("(%d)%d ",i,(int)*b);
		}
		printf("\n");
	    }
	}
#endif /* QAK */
	printf("%s: check 6.0, tconv_buf=%p, *tconv_buf=%p\n",FUNC,tconv_buf,*(char **)tconv_buf);
#endif

        if (H5T_BKG_YES==need_bkg) {
#ifdef QAK
	printf("%s: check 6.1, need_bkg=%d\n",FUNC,(int)need_bkg);
#endif
#ifdef H5S_DEBUG
            H5_timer_begin(&timer);
#endif
            n = (sconv->f->gath)(dataset->ent.file, &(dataset->layout), &pline,
                                 &fill, &efl, dst_type_size, file_space, 
                                 &bkg_iter, smine_nelmts, dxpl_id, 
                                 bkg_buf/*out*/); 

#ifdef H5S_DEBUG
            H5_timer_end(&(sconv->stats[0].bkg_timer), &timer);
            sconv->stats[0].bkg_nbytes += n * dst_type_size;
            sconv->stats[0].bkg_ncalls++;
#endif
            if (n!=smine_nelmts)
                HGOTO_ERROR (H5E_IO, H5E_WRITEERROR, FAIL, "file gather failed");
        } else if (need_bkg) {
#ifdef QAK
	printf("%s: check 6.2, need_bkg=%d\n",FUNC,(int)need_bkg);
#endif
            H5_CHECK_OVERFLOW(request_nelmts*dst_type_size,hsize_t,size_t);
            HDmemset(bkg_buf, 0, (size_t)(request_nelmts*dst_type_size));
        } /* end if */
	
        /*
         * Perform data type conversion.
         */
        if (H5T_convert(tpath, src_id, dst_id, smine_nelmts, 0, 0, tconv_buf, bkg_buf, dxpl_id)<0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "data type conversion failed");
#ifdef QAK
	printf("%s: check 6.3\n",FUNC);
#endif

        /*
         * Scatter the data out to the file.
         */
#ifdef H5S_DEBUG
        H5_timer_begin(&timer);
#endif
        status = (sconv->f->scat)(dataset->ent.file, &(dataset->layout), 
                                  &pline, &fill, &efl, dst_type_size, 
                                  file_space, &file_iter, smine_nelmts, 
                                  dxpl_id, tconv_buf);

#ifdef QAK
	printf("%s: check 6.35\n",FUNC);
#endif
#ifdef H5S_DEBUG
        H5_timer_end(&(sconv->stats[0].scat_timer), &timer);
        sconv->stats[0].scat_nbytes += smine_nelmts * dst_type_size;
        sconv->stats[0].scat_ncalls++;
#endif
        if (status<0)
            HGOTO_ERROR (H5E_DATASET, H5E_WRITEERROR, FAIL, "scatter failed");
    } /* end for */

#ifdef QAK
	printf("%s: check 6.4\n",FUNC);
#endif
    /*
     * Update modification time.  We have to do this explicitly because
     * writing to a dataset doesn't necessarily change the object header.
     */
    if (H5O_touch(&(dataset->ent), FALSE)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to update modification time");

done:
#ifdef H5_HAVE_PARALLEL
    /* restore xfer_mode due to the kludge */
    if (doing_mpio && xfer_mode_changed) {
#ifdef H5D_DEBUG
	if (H5DEBUG(D)) {
	    fprintf (H5DEBUG(D), "H5D: dx->xfermode was %d, restored to %d\n",
		dx->xfer_mode, xfer_mode);
	} /* end if */
#endif
	dx->xfer_mode = xfer_mode;
    } /* end if */
#endif
    /* Release selection iterators */
    H5S_sel_iter_release(file_space,&file_iter);
    H5S_sel_iter_release(mem_space,&mem_iter);
    H5S_sel_iter_release(file_space,&bkg_iter);

    if (src_id >= 0)
        H5I_dec_ref(src_id);
    if (dst_id >= 0)
        H5I_dec_ref(dst_id);
    assert(dx_plist);
    if (tconv_buf && NULL==H5P_peek_voidp(dx_plist,H5D_XFER_TCONV_BUF_NAME))
        H5FL_BLK_FREE(type_conv,tconv_buf);
    if (bkg_buf && NULL==H5P_peek_voidp(dx_plist,H5D_XFER_BKGR_BUF_NAME))
        H5FL_BLK_FREE(bkgr_conv,bkg_buf);
    if (free_this_space)
        H5S_close(free_this_space);
    FUNC_LEAVE(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_extend
 *
 * Purpose:	Increases the size of a dataset.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Friday, January 30, 1998
 *
 * Modifications:
 *
 *              Raymond Lu
 *              Tuesday, October 2, 2001
 *              Changed the way to retrieve property for generic property 
 *              list.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_extend (H5D_t *dataset, const hsize_t *size)
{
    herr_t	changed, ret_value=FAIL;
    H5S_t	*space = NULL;
    H5O_fill_t  fill;
    H5P_genplist_t *plist;      /* Property list */

    FUNC_ENTER (H5D_extend, FAIL);

    /* Check args */
    assert (dataset);
    assert (size);

    /*
     * NOTE: Restrictions on extensions were checked when the dataset was
     *	     created.  All extensions are allowed here since none should be
     *	     able to muck things up.
     */

    /* Increase the size of the data space */
    if (NULL==(space=H5S_read (&(dataset->ent))))
	HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to read data space info from dataset header");
    if ((changed=H5S_extend (space, size))<0)
	HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to increase size of data space");

    if (changed>0){
	/* Save the new dataspace in the file if necessary */
	if (H5S_modify (&(dataset->ent), space)<0)
	    HGOTO_ERROR (H5E_DATASET, H5E_WRITEERROR, FAIL, "unable to update file with new dataspace");

	/* Initialize the new parts of the dataset */
#ifdef LATER
	if (H5S_select_all(space)<0 ||
                H5S_select_hyperslab(space, H5S_SELECT_DIFF, zero, NULL, old_dims, NULL)<0)
	    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to select new extents for fill value");
#else
	/*
	 * We don't have the H5S_SELECT_DIFF operator yet.  We really only
	 * need it for contiguous datasets because the chunked datasets will
	 * either fill on demand during I/O or attempt a fill of all chunks.
	 */
        if (NULL == (plist = H5I_object(dataset->dcpl_id)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");
        if(H5P_get(plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get fill value");
        if(H5D_CONTIGUOUS == dataset->layout.type && fill.buf) 
            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to select fill value region"); 
#endif
	if (H5D_init_storage(dataset, space)<0)
	    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize dataset with fill value");
    } /* end if */

    ret_value = SUCCEED;

done:
    H5S_close(space);
    FUNC_LEAVE (ret_value);
}




    

/*-------------------------------------------------------------------------
 * Function:	H5D_entof
 *
 * Purpose:	Returns a pointer to the entry for a dataset.
 *
 * Return:	Success:	Ptr to entry
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Friday, April 24, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5G_entry_t *
H5D_entof (H5D_t *dataset)
{
    return dataset ? &(dataset->ent) : NULL;
}


/*-------------------------------------------------------------------------
 * Function:	H5D_typeof
 *
 * Purpose:	Returns a pointer to the dataset's data type.  The data type
 *		is not copied.
 *
 * Return:	Success:	Ptr to the dataset's data type, uncopied.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Thursday, June  4, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_t *
H5D_typeof (H5D_t *dset)
{
    FUNC_ENTER (H5D_typeof, NULL);
    assert (dset);
    assert (dset->type);
    FUNC_LEAVE (dset->type);
}


/*-------------------------------------------------------------------------
 * Function:  H5D_get_file
 *
 * Purpose:   Returns the dataset's file pointer.
 *
 * Return:    Success:        Ptr to the dataset's file pointer.
 *
 *            Failure:        NULL
 *
 * Programmer:        Quincey Koziol
 *              Thursday, October 22, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5F_t *
H5D_get_file (const H5D_t *dset)
{
    FUNC_ENTER (H5D_get_file, NULL);
    assert (dset);
    assert (dset->ent.file);
    FUNC_LEAVE (dset->ent.file);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_init_storage
 *
 * Purpose:	Initialize the data for a new dataset.  If a selection is
 *		defined for SPACE then initialize only that part of the
 *		dataset.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Monday, October  5, 1998
 *
 * Modifications:
 *
 *              Raymond Lu
 *              Tuesday, October 2, 2001
 *              Changed the way to retrieve property for generic property 
 *              list.
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_init_storage(H5D_t *dset, const H5S_t *space)
{
    hssize_t            snpoints;       /* Number of points in space (for error checking) */
    size_t              npoints;        /* Number of points in space */
    size_t              ptsperbuf;
    size_t		bufsize=8*1024;
    size_t		size;
    haddr_t		addr;
    herr_t		ret_value = FAIL;
    void		*buf = NULL;
    H5O_fill_t          fill;
    H5O_efl_t           efl;
    H5O_pline_t         pline;
    H5P_genplist_t *plist;      /* Property list */

    FUNC_ENTER(H5D_init_storage, FAIL);
    assert(dset);
    assert(space);

    /* Get fill value, external file list, and data pipeline properties */
    if (NULL == (plist = H5I_object(dset->dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");
    if(H5P_get(plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get fill value");
    if(H5P_get(plist, H5D_CRT_EXT_FILE_LIST_NAME, &efl) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get external file list");
    if(H5P_get(plist, H5D_CRT_DATA_PIPELINE_NAME, &pline) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get data pipeline");

    switch (dset->layout.type) {
        case H5D_CONTIGUOUS:
            /*
             * If the fill value is set then write it to the specified selection
             * even if it is all zero.  This allows the application to force
             * filling when the underlying storage isn't initialized to zero.
             */
            snpoints = H5S_get_simple_extent_npoints(space);
            assert(snpoints>=0);
            H5_ASSIGN_OVERFLOW(npoints,snpoints,hssize_t,size_t);
            
            if (fill.buf && npoints==(size_t)H5S_get_select_npoints(space)) {
                /*
                 * Fill the entire current extent with the fill value.  We can do
                 * this quite efficiently by making sure we copy the fill value
                 * in relatively large pieces.
                 */
			
                ptsperbuf = MAX(1, bufsize/fill.size);
                bufsize = ptsperbuf*fill.size;

                /* Allocate temporary buffer */
                if ((buf=H5FL_BLK_ALLOC(fill_conv,bufsize,0))==NULL)
                    HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for fill buffer");

                H5V_array_fill(buf, fill.buf, fill.size, ptsperbuf);
                if (efl.nused) {
                    addr = 0;
                } else {
                    addr = dset->layout.addr;
		}                

                while (npoints>0) {
                    size = MIN(ptsperbuf, npoints) * fill.size;
                    if(efl.nused) {
		        if(H5O_efl_write(dset->ent.file, &efl, addr, size, buf) < 0)
                            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to write fill value to dataset");
                    } else {
                        if (H5F_block_write(dset->ent.file, H5FD_MEM_DRAW, addr, size, H5P_DATASET_XFER_DEFAULT, buf)<0)
                            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to write fill value to dataset");
                    }
                    npoints -= MIN(ptsperbuf, npoints);
                    addr += size;
                } /* end while */
            } else if(fill.buf) {
                /*
                 * Fill the specified selection with the fill value.
                 */
                HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to initialize dataset with fill value");
            }
            break;

        case H5D_CHUNKED:
#ifdef H5_HAVE_PARALLEL
            /*
             * If the dataset is accessed via parallel I/O, allocate file space
             * for all chunks now and initialize each chunk with the fill value.
             */
            if (IS_H5FD_MPIO(dset->ent.file)) {
                /* We only handle simple data spaces so far */
                int		ndims;
                hsize_t		dim[H5O_LAYOUT_NDIMS];
                
                if ((ndims=H5S_get_simple_extent_dims(space, dim, NULL))<0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to get simple data space info");
                dim[ndims] = dset->layout.dim[ndims];
                ndims++;

                if (H5F_istore_allocate(dset->ent.file, 
                        H5P_DATASET_XFER_DEFAULT, &(dset->layout), dim, &pline, &fill)<0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to allocate all chunks of dataset");
            } /* end if */
#endif /*H5_HAVE_PARALLEL*/
            break;
    } /* end switch */
    ret_value = SUCCEED;

done:
    if (buf)
        H5FL_BLK_FREE(fill_conv,buf);
    FUNC_LEAVE(ret_value);
}


/*-------------------------------------------------------------------------
 * Function:	H5Dget_storage_size
 *
 * Purpose:	Returns the amount of storage that is required for the
 *		dataset. For chunked datasets this is the number of allocated
 *		chunks times the chunk size.
 *
 * Return:	Success:	The amount of storage space allocated for the
 *				dataset, not counting meta data. The return
 *				value may be zero if no data has been stored.
 *
 *		Failure:	Zero
 *
 * Programmer:	Robb Matzke
 *              Wednesday, April 21, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hsize_t
H5Dget_storage_size(hid_t dset_id)
{
    H5D_t	*dset=NULL;
    hsize_t	size;
    
    FUNC_ENTER(H5Dget_storage_size, 0);
    H5TRACE1("h","i",dset_id);

    /* Check args */
    if (H5I_DATASET!=H5I_get_type(dset_id) || NULL==(dset=H5I_object(dset_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a dataset");
    }

    size = H5D_get_storage_size(dset);
    FUNC_LEAVE(size);
}


/*-------------------------------------------------------------------------
 * Function:	H5D_get_storage_size
 *
 * Purpose:	Determines how much space has been reserved to store the raw
 *		data of a dataset.
 *
 * Return:	Success:	Number of bytes reserved to hold raw data.
 *
 *		Failure:	0
 *
 * Programmer:	Robb Matzke
 *              Wednesday, April 21, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hsize_t
H5D_get_storage_size(H5D_t *dset)
{
    hsize_t	size;
    unsigned		u;
    
    FUNC_ENTER(H5D_get_storage_size, 0);

    if (H5D_CHUNKED==dset->layout.type) {
        size = H5F_istore_allocated(dset->ent.file, dset->layout.ndims,
				    dset->layout.addr);
    } else {
        for (u=0, size=1; u<dset->layout.ndims; u++) {
            size *= dset->layout.dim[u];
        }
    }
	
    FUNC_LEAVE(size);
}

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

    FUNC_ENTER(H5Diterate, FAIL);
    H5TRACE5("e","xiixx",buf,type_id,space_id,op,operator_data);

    /* Check args */
    if (NULL==op)
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid operator");
    if (buf==NULL)
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid buffer");
    if (H5I_DATATYPE != H5I_get_type(type_id))
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid datatype");
    if (H5I_DATASPACE != H5I_get_type(space_id) ||
            NULL == (space = H5I_object(space_id)))
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid dataspace");

    ret_value=H5S_select_iterate(buf,type_id,space,op,operator_data);

    FUNC_LEAVE(ret_value);
}   /* end H5Diterate() */

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

    FUNC_ENTER(H5Dvlen_reclaim, FAIL);
    H5TRACE4("e","iiix",type_id,space_id,plist_id,buf);

    /* Check args */
    if (H5I_DATATYPE!=H5I_get_type(type_id) ||
            H5I_DATASPACE!=H5I_get_type(space_id) ||
            buf==NULL)
	HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid argument");

    /* Get the default dataset transfer property list if the user didn't provide one */
    if (H5P_DEFAULT == plist_id)
        plist_id= H5P_DATASET_XFER_DEFAULT;

    if (TRUE!=H5P_isa_class(plist_id,H5P_DATASET_XFER))
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not xfer parms");

    /* Call H5Diterate with args, etc. */
    ret_value=H5Diterate(buf,type_id,space_id,H5T_vlen_reclaim,&plist_id);

    FUNC_LEAVE(ret_value);
}   /* end H5Dvlen_reclaim() */

/*-------------------------------------------------------------------------
 * Function:	H5D_vlen_get_buf_size_alloc
 *
 * Purpose:	This routine makes certain there is enough space in the temporary
 *      buffer for the new data to read in.  All the VL data read in is actually
 *      placed in this buffer, overwriting the previous data.  Needless to say,
 *      this data is not actually usable.
 *
 * Return:	Non-negative on success, negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, August 17, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
void *H5D_vlen_get_buf_size_alloc(size_t size, void *info)
{
    H5T_vlen_bufsize_t *vlen_bufsize=(H5T_vlen_bufsize_t *)info;

    FUNC_ENTER(H5D_vlen_get_buf_size_alloc, NULL);

    /* Get a temporary pointer to space for the VL data */
    if ((vlen_bufsize->vl_tbuf=H5FL_BLK_REALLOC(vlen_vl_buf,vlen_bufsize->vl_tbuf,size))!=NULL)
        vlen_bufsize->size+=size;

    FUNC_LEAVE(vlen_bufsize->vl_tbuf);
} /* end H5D_vlen_get_buf_size_alloc() */


/*-------------------------------------------------------------------------
 * Function:	H5D_vlen_get_buf_size
 *
 * Purpose:	This routine checks the number of bytes required to store a single
 *      element from a dataset in memory, creating a selection with just the
 *      single element selected to read in the element and using a custom memory
 *      allocator for any VL data encountered.
 *          The *size value is modified according to how many bytes are
 *      required to store the element in memory.
 *
 * Implementation: This routine actually performs the read with a custom
 *      memory manager which basically just counts the bytes requested and
 *      uses a temporary memory buffer (through the H5FL API) to make certain
 *      enough space is available to perform the read.  Then the temporary
 *      buffer is released and the number of bytes allocated is returned.
 *      Kinda kludgy, but easier than the other method of trying to figure out
 *      the sizes without actually reading the data in... - QAK
 *
 * Return:	Non-negative on success, negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, August 17, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_vlen_get_buf_size(void UNUSED *elem, hid_t type_id, hsize_t UNUSED ndim, hssize_t *point, void *op_data)
{
    H5T_vlen_bufsize_t *vlen_bufsize=(H5T_vlen_bufsize_t *)op_data;
    H5T_t	*dt = NULL;
    herr_t ret_value=FAIL;

    FUNC_ENTER(H5D_vlen_get_buf_size, FAIL);

    assert(op_data);
    assert(H5I_DATATYPE == H5I_get_type(type_id));

    /* Check args */
    if (NULL==(dt=H5I_object(type_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");

    /* Make certain there is enough fixed-length buffer available */
    if ((vlen_bufsize->fl_tbuf=H5FL_BLK_REALLOC(vlen_fl_buf,vlen_bufsize->fl_tbuf,H5T_get_size(dt)))==NULL)
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't resize tbuf");

    /* Select point to read in */
    if (H5Sselect_elements(vlen_bufsize->fspace_id,H5S_SELECT_SET,1,(const hssize_t **)point)<0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "can't select point");

    /* Read in the point (with the custom VL memory allocator) */
    if(H5Dread(vlen_bufsize->dataset_id,type_id,vlen_bufsize->mspace_id,vlen_bufsize->fspace_id,vlen_bufsize->xfer_pid,vlen_bufsize->fl_tbuf)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "can't read point");

    /* Set the correct return value, if we get this far */
    ret_value=0;

done:

    FUNC_LEAVE(ret_value);
}   /* end H5D_vlen_get_buf_size() */


/*-------------------------------------------------------------------------
 * Function:	H5Dvlen_get_buf_size
 *
 * Purpose:	This routine checks the number of bytes required to store the VL
 *      data from the dataset, using the space_id for the selection in the
 *      dataset on disk and the type_id for the memory representation of the
 *      VL data, in memory.  The *size value is modified according to how many
 *      bytes are required to store the VL data in memory.
 *
 * Implementation: This routine actually performs the read with a custom
 *      memory manager which basically just counts the bytes requested and
 *      uses a temporary memory buffer (through the H5FL API) to make certain
 *      enough space is available to perform the read.  Then the temporary
 *      buffer is released and the number of bytes allocated is returned.
 *      Kinda kludgy, but easier than the other method of trying to figure out
 *      the sizes without actually reading the data in... - QAK
 *
 * Return:	Non-negative on success, negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, August 11, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Dvlen_get_buf_size(hid_t dataset_id, hid_t type_id, hid_t space_id,
        hsize_t *size)
{
    H5T_vlen_bufsize_t vlen_bufsize = {0, 0, 0, 0, 0, 0, 0};
    char bogus;         /* bogus value to pass to H5Diterate() */
    H5P_genclass_t  *pclass;    /* Property class */
    H5P_genplist_t  *plist;     /* Property list */
    herr_t ret_value=FAIL;

    FUNC_ENTER(H5Dvlen_get_buf_size, FAIL);
    H5TRACE4("e","iii*h",dataset_id,type_id,space_id,size);

    /* Check args */
    if (H5I_DATASET!=H5I_get_type(dataset_id) ||
            H5I_DATATYPE!=H5I_get_type(type_id) ||
            H5I_DATASPACE!=H5I_get_type(space_id) || size==NULL)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid argument");

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

    /* Get a copy of the dataspace ID */
    if((vlen_bufsize.fspace_id=H5Dget_space(dataset_id))<0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't copy dataspace");
    
    /* Create a scalar for the memory dataspace */
    if((vlen_bufsize.mspace_id=H5Screate(H5S_SCALAR))<0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't create dataspace");

    /* Grab the temporary buffers required */
    if((vlen_bufsize.fl_tbuf=H5FL_BLK_ALLOC(vlen_fl_buf,1,0))==NULL)
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "no temporary buffers available");
    if((vlen_bufsize.vl_tbuf=H5FL_BLK_ALLOC(vlen_vl_buf,1,0))==NULL)
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "no temporary buffers available");

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

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

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

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

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

    /* Call H5Diterate with args, etc. */
    ret_value=H5Diterate(&bogus,type_id,space_id,H5D_vlen_get_buf_size,&vlen_bufsize);

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

done:
    if(vlen_bufsize.fspace_id>0)
        H5Sclose(vlen_bufsize.fspace_id);
    if(vlen_bufsize.mspace_id>0)
        H5Sclose(vlen_bufsize.mspace_id);
    if(vlen_bufsize.fl_tbuf!=NULL)
        H5FL_BLK_FREE(vlen_fl_buf,vlen_bufsize.fl_tbuf);
    if(vlen_bufsize.vl_tbuf!=NULL)
        H5FL_BLK_FREE(vlen_vl_buf,vlen_bufsize.vl_tbuf);
    if(vlen_bufsize.xfer_pid>0)
        H5I_dec_ref(vlen_bufsize.xfer_pid);

    FUNC_LEAVE(ret_value);
}   /* end H5Dvlen_get_buf_size() */


/*-------------------------------------------------------------------------
 * Function:	H5Ddebug
 *
 * Purpose:	Prints various information about a dataset.  This function is
 *		not to be documented in the API at this time.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Wednesday, April 28, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Ddebug(hid_t dset_id, unsigned UNUSED flags)
{
    H5D_t	*dset=NULL;

    FUNC_ENTER(H5Ddebug, FAIL);
    H5TRACE2("e","iIu",dset_id,flags);

    /* Check args */
    if (H5I_DATASET!=H5I_get_type(dset_id) ||
	NULL==(dset=H5I_object(dset_id))) {
	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
    }

    /* Print B-tree information */
    if (H5D_CHUNKED==dset->layout.type) {
	H5F_istore_dump_btree(dset->ent.file, stdout, dset->layout.ndims,
			      dset->layout.addr);
    } else if (H5D_CONTIGUOUS==dset->layout.type) {
	HDfprintf(stdout, "    %-10s %a\n", "Address:",
		  dset->layout.addr);
    }
    
    FUNC_LEAVE(SUCCEED);
}



/*-------------------------------------------------------------------------
 * Function: H5Dset_extend
 *
 * Purpose: Modifies the dimensions of a dataset, based on H5Dextend
 *
 * Return: Success: 0, Failure: -1
 *
 * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
 *             Robb Matzke
 *
 * Date: March 13, 2002
 *
 * Comments: Public function, calls private H5D_set_extend
 *
 * Modifications:
 *
 *
 *-------------------------------------------------------------------------
 */


herr_t H5Dset_extend( hid_t dset_id, const hsize_t *size )
{
 H5D_t *dset = NULL;
 
 FUNC_ENTER( H5Dset_extend, FAIL );
 H5TRACE2( "e", "i*h", dset_id, size );

 /* Check args */
 if ( H5I_DATASET != H5I_get_type( dset_id ) || NULL == ( dset = H5I_object( dset_id ))) 
 {
  HRETURN_ERROR( H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset" );
 }
 if ( !size ) 
 {
  HRETURN_ERROR( H5E_ARGS, H5E_BADVALUE, FAIL, "no size specified" );
 }

 /* Modify size */
 if ( H5D_set_extend (dset, size) < 0 ) 
 {
  HRETURN_ERROR( H5E_DATASET, H5E_CANTINIT, FAIL, "unable to set extend dataset");
 }

 FUNC_LEAVE (SUCCEED);
}



/*-------------------------------------------------------------------------
 * Function: H5D_set_extend
 *
 * Purpose: Same as H5D_extend, allows change to a lower dimension, calls H5S_modify
 *
 * Return: Success: 0, Failure: -1
 *
 * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
 *             Robb Matzke
 *
 * Date: March 13, 2002
 *
 * Comments: 
 *
 * Modifications:
 *
 *
 *-------------------------------------------------------------------------
 */

herr_t H5D_set_extend( H5D_t *dataset, const hsize_t *size )
{
 herr_t changed;
 herr_t ret_value = FAIL;
 H5S_t *space = NULL;
 H5O_fill_t fill;
 H5P_genplist_t *plist;

 FUNC_ENTER( H5D_set_extend, FAIL );

 /* Check args */
 assert( dataset );
 assert( size );

/*
 * NOTE: Restrictions on extensions were checked when the dataset was
 * created. All extensions are allowed here since none should be
 * able to muck things up.
 */

 /* Increase the size of the data space */
 if ( NULL == ( space = H5S_read (&(dataset->ent))))
  HGOTO_ERROR( H5E_DATASET, H5E_CANTINIT, FAIL, "unable to read data space info from dataset header");
 
 if ( ( changed = H5S_set_extend( space, size )) < 0 )
  HGOTO_ERROR (H5E_DATASET, H5E_CANTINIT, FAIL, "unable to modify size of data space");

 if ( changed > 0 )
 {
  /* Save the new dataspace in the file if necessary */
  if ( H5S_modify ( &(dataset->ent ), space ) < 0 )
   HGOTO_ERROR (H5E_DATASET, H5E_WRITEERROR, FAIL, "unable to update file with new dataspace");

  /* Initialize the new parts of the dataset */
#ifdef LATER
  if ( H5S_select_all( space ) < 0 || H5S_select_hyperslab( space, H5S_SELECT_DIFF, zero, NULL, old_dims, NULL ) < 0 )
   HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to select new extents for fill value");
#else

 /*
  * We don't have the H5S_SELECT_DIFF operator yet.  We really only
  * need it for contiguous datasets because the chunked datasets will
  * either fill on demand during I/O or attempt a fill of all chunks.
  */
  
  if ( NULL == ( plist = H5I_object(dataset->dcpl_id )))
   HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list");
  if( H5P_get( plist, H5D_CRT_FILL_VALUE_NAME, &fill ) < 0 )
   HGOTO_ERROR( H5E_DATASET, H5E_CANTGET, FAIL, "can't get fill value" );
  if( H5D_CONTIGUOUS == dataset->layout.type && fill.buf ) 
   HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to select fill value region"); 
#endif

  if ( H5D_init_storage( dataset, space ) < 0 )
   HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize dataset with fill value");


 /* Update chunk information */
 if ( H5D_CHUNKED == dataset->layout.type )
 {

		if ( H5D_update_chunk( dataset ) < 0 )
			goto done;


	}


 } /* end if changed */


 ret_value = SUCCEED;

done:
 H5S_close( space );
 FUNC_LEAVE( ret_value );
}



/*-------------------------------------------------------------------------
 * Function: H5D_update_chunk
 *
 * Purpose: 
 *
 * Return: Success: 0, Failure: -1
 *
 * Programmer: Implementation: Pedro Vicente, pvn@ncsa.uiuc.edu
 *             Algorithm: Robb Matzke
 *
 * Date: March 13, 2002
 *
 * Comments: 
 *
 * Modifications:
 *
 *
 *-------------------------------------------------------------------------
 */

herr_t H5D_update_chunk( H5D_t *dset )
{

	H5F_istore_dump_btree( dset->ent.file, stdout, dset->layout.ndims, dset->layout.addr );

 return 0;

}