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
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.10.0"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>HDF5: HDF5 Packet Table APIs (H5PT)</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtreedata.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript" src="cookie.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/searchdata.js"></script>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */
$(function() { init_search(); });
/* @license-end */
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
<link href="hdf5doxy.css" rel="stylesheet" type="text/css">
<!-- <link href="hdf5doxy.css" rel="stylesheet" type="text/css"/>
-->
<script type="text/javascript" src="hdf5_navtree_hacks.js"></script>
</head>
<body>
<div style="background:#FFDDDD;font-size:120%;text-align:center;margin:0;padding:5px">Please, help us to better serve our user community by answering the following short survey: <a href="https://www.hdfgroup.org/website-survey/">https://www.hdfgroup.org/website-survey/</a></div>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td id="projectlogo"><img alt="Logo" src="HDFG-logo.png"/></td>
<td id="projectalign" style="padding-left: 0.5em;">
<div id="projectname"><a href="https://www.hdfgroup.org">HDF5</a>
 <span id="projectnumber">1.15.0.2908dd1</span>
</div>
<div id="projectbrief">API Reference</div>
</td>
<td> <div id="MSearchBox" class="MSearchBoxInactive">
<span class="left">
<span id="MSearchSelect" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()"> </span>
<input type="text" id="MSearchField" value="" placeholder="Search" accesskey="S"
onfocus="searchBox.OnSearchFieldFocus(true)"
onblur="searchBox.OnSearchFieldFocus(false)"
onkeyup="searchBox.OnSearchFieldChange(event)"/>
</span><span class="right">
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.svg" alt=""/></a>
</span>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.10.0 -->
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */
var searchBox = new SearchBox("searchBox", "search/",'.html');
/* @license-end */
</script>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
<div id="nav-tree">
<div id="nav-tree-contents">
<div id="nav-sync" class="sync"></div>
</div>
</div>
<div id="splitbar" style="-moz-user-select:none;"
class="ui-resizable-handle">
</div>
</div>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */
$(function(){initNavTree('group___h5_p_t.html',''); initResizable(); });
/* @license-end */
</script>
<div id="doc-content">
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
</div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<div id="MSearchResults">
<div class="SRPage">
<div id="SRIndex">
<div id="SRResults"></div>
<div class="SRStatus" id="Loading">Loading...</div>
<div class="SRStatus" id="Searching">Searching...</div>
<div class="SRStatus" id="NoMatches">No Matches</div>
</div>
</div>
</div>
</div>
<div class="header">
<div class="summary">
<a href="#func-members">Functions</a> </div>
<div class="headertitle"><div class="title">HDF5 Packet Table APIs (H5PT)</div></div>
</div><!--header-->
<div class="contents">
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p><em>Creating and manipulating HDF5 datasets to support append- and read-only operations on table data (H5PT)</em></p>
<p>The HDF5 Packet Table API is designed to allow records to be appended to and read from a table. Packet Table datasets are chunked, allowing them to grow as needed.</p>
<p>The Packet Table API, with the H5PT prefix, is not to be confused with the H5TB Table API (H5TB prefix). The H5TB APIs are stateless (H5TB Tables do not need to be opened or closed) but H5PT Packet Tables require less performance overhead. Also, H5TB Tables support insertions and deletions, while H5PT Packet Tables support only append operations. H5TB functions should not be called on tables created with the H5PT API, or vice versa.</p>
<p>Packet Tables are datasets in an HDF5 file, so while their contents should not be changed outside of the H5PT API calls, the datatypes of Packet Tables can be queried using <a class="el" href="group___h5_d.html#ga7cd04b8332e8a0939b9973fbc500cadb">H5Dget_type</a>. Packet Tables can also be given attributes using the normal HDF5 APIs.</p>
<dl class="section note"><dt>Note</dt><dd><b>Programming hints:</b> </dd>
<dd>
The following line includes the HDF5 Packet Table package, H5PT, in C applications: <div class="fragment"><div class="line"><span class="preprocessor">#include "hdf5_hl.h"</span> </div>
</div><!-- fragment --> Without this include, an application will not have access to these functions.</dd></dl>
<ul>
<li><a class="el" href="#gae73861e153e86df61f24c5736c9dbb1c">H5PTappend</a> <br />
Appends packets to the end of a packet table.</li>
<li><a class="el" href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2">H5PTclose</a> <br />
Closes an open packet table.</li>
<li><a class="el" href="#ga1f5ab7315bfb892ea51cc1cbaa78010b">H5PTcreate</a> <br />
Creates a packet table to store fixed-length or variable-length packets.</li>
<li><a class="el" href="#gae49bb0e714fd3dfff6141bfb85a331ce">H5PTcreate_fl</a> <br />
Creates a packet table to store fixed-length packets.</li>
<li><a class="el" href="#ga663f235cfcf8676636224f7b19629513">H5PTcreate_index</a> <br />
Resets a packet table's index to the first packet.</li>
<li><a class="el" href="#ga8b078a7c9898869f8c3a35da40065ad7">H5PTfree_vlen_buff</a> <br />
Releases memory allocated in the process of reading variable-length packets.</li>
<li><a class="el" href="#gaa6c6799b38ad7d3f5d02633d61dab58f">H5PTget_dataset</a> <br />
Returns the backend dataset of this packet table.</li>
<li><a class="el" href="#ga7b1e7efcc3bf1f2f9476ec3ff7d24532">H5PTget_index</a> <br />
Gets the current record index for a packet table</li>
<li><a class="el" href="#ga88988f5548b7be3efe20c4af32e6d440">H5PTget_next</a> <br />
Reads packets from a packet table starting at the current index.</li>
<li><a class="el" href="#gafcb0b70001557c14840ec58bcb46ba4d">H5PTget_num_packets</a> <br />
Returns the number of packets in a packet table.</li>
<li><a class="el" href="#gafcaf63e9606f70b5cef2b3e6aa394c36">H5PTget_type</a> <br />
Returns the backend datatype of this packet table.</li>
<li><a class="el" href="#ga5200eb8cf2d4f8fb5bd455c5e6616a86">H5PTis_valid</a> <br />
Determines whether an identifier points to a packet table.</li>
<li><a class="el" href="#ga118f7300157d7992459032d851afcd95">H5PTis_varlen</a> <br />
Determines whether a packet table contains variable-length or fixed-length packets.</li>
<li><a class="el" href="#ga15a7ab544d6147aaf68ae42545f88acf">H5PTopen</a> <br />
Opens an existing packet table.</li>
<li><a class="el" href="#gaf74154d76b4f12b82fc59ed816e98578">H5PTread_packets</a> <br />
Reads a number of packets from a packet table.</li>
<li><a class="el" href="#ga2edb6d88047d4de85c3aaed36b79a57d">H5PTset_index</a> <br />
Sets a packet table's index. </li>
</ul>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga1f5ab7315bfb892ea51cc1cbaa78010b" id="r_ga1f5ab7315bfb892ea51cc1cbaa78010b"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga1f5ab7315bfb892ea51cc1cbaa78010b">H5PTcreate</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *dset_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dtype_id, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> chunk_size, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id)</td></tr>
<tr class="memdesc:ga1f5ab7315bfb892ea51cc1cbaa78010b"><td class="mdescLeft"> </td><td class="mdescRight">Creates a packet table to store fixed-length or variable-length packets. <br /></td></tr>
<tr class="separator:ga1f5ab7315bfb892ea51cc1cbaa78010b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga15a7ab544d6147aaf68ae42545f88acf" id="r_ga15a7ab544d6147aaf68ae42545f88acf"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga15a7ab544d6147aaf68ae42545f88acf">H5PTopen</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *dset_name)</td></tr>
<tr class="memdesc:ga15a7ab544d6147aaf68ae42545f88acf"><td class="mdescLeft"> </td><td class="mdescRight">Opens an existing packet table. <br /></td></tr>
<tr class="separator:ga15a7ab544d6147aaf68ae42545f88acf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf9f4fe7b207aaa7aa63b17cee625c0e2" id="r_gaf9f4fe7b207aaa7aa63b17cee625c0e2"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2">H5PTclose</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id)</td></tr>
<tr class="memdesc:gaf9f4fe7b207aaa7aa63b17cee625c0e2"><td class="mdescLeft"> </td><td class="mdescRight">Closes an open packet table. <br /></td></tr>
<tr class="separator:gaf9f4fe7b207aaa7aa63b17cee625c0e2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gae49bb0e714fd3dfff6141bfb85a331ce" id="r_gae49bb0e714fd3dfff6141bfb85a331ce"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gae49bb0e714fd3dfff6141bfb85a331ce">H5PTcreate_fl</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> loc_id, const char *dset_name, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> dtype_id, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> chunk_size, int compression)</td></tr>
<tr class="memdesc:gae49bb0e714fd3dfff6141bfb85a331ce"><td class="mdescLeft"> </td><td class="mdescRight">Creates a packet table to store fixed-length packets. <br /></td></tr>
<tr class="separator:gae49bb0e714fd3dfff6141bfb85a331ce"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gae73861e153e86df61f24c5736c9dbb1c" id="r_gae73861e153e86df61f24c5736c9dbb1c"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gae73861e153e86df61f24c5736c9dbb1c">H5PTappend</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id, size_t nrecords, const void *data)</td></tr>
<tr class="memdesc:gae73861e153e86df61f24c5736c9dbb1c"><td class="mdescLeft"> </td><td class="mdescRight">Appends packets to the end of a packet table. <br /></td></tr>
<tr class="separator:gae73861e153e86df61f24c5736c9dbb1c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga88988f5548b7be3efe20c4af32e6d440" id="r_ga88988f5548b7be3efe20c4af32e6d440"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga88988f5548b7be3efe20c4af32e6d440">H5PTget_next</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id, size_t nrecords, void *data)</td></tr>
<tr class="memdesc:ga88988f5548b7be3efe20c4af32e6d440"><td class="mdescLeft"> </td><td class="mdescRight">Reads packets from a packet table starting at the current index. <br /></td></tr>
<tr class="separator:ga88988f5548b7be3efe20c4af32e6d440"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf74154d76b4f12b82fc59ed816e98578" id="r_gaf74154d76b4f12b82fc59ed816e98578"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaf74154d76b4f12b82fc59ed816e98578">H5PTread_packets</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> start, size_t nrecords, void *data)</td></tr>
<tr class="memdesc:gaf74154d76b4f12b82fc59ed816e98578"><td class="mdescLeft"> </td><td class="mdescRight">Reads a number of packets from a packet table. <br /></td></tr>
<tr class="separator:gaf74154d76b4f12b82fc59ed816e98578"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafcb0b70001557c14840ec58bcb46ba4d" id="r_gafcb0b70001557c14840ec58bcb46ba4d"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gafcb0b70001557c14840ec58bcb46ba4d">H5PTget_num_packets</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *nrecords)</td></tr>
<tr class="memdesc:gafcb0b70001557c14840ec58bcb46ba4d"><td class="mdescLeft"> </td><td class="mdescRight">Returns the number of packets in a packet table. <br /></td></tr>
<tr class="separator:gafcb0b70001557c14840ec58bcb46ba4d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5200eb8cf2d4f8fb5bd455c5e6616a86" id="r_ga5200eb8cf2d4f8fb5bd455c5e6616a86"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga5200eb8cf2d4f8fb5bd455c5e6616a86">H5PTis_valid</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id)</td></tr>
<tr class="memdesc:ga5200eb8cf2d4f8fb5bd455c5e6616a86"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether an identifier points to a packet table. <br /></td></tr>
<tr class="separator:ga5200eb8cf2d4f8fb5bd455c5e6616a86"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga118f7300157d7992459032d851afcd95" id="r_ga118f7300157d7992459032d851afcd95"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga118f7300157d7992459032d851afcd95">H5PTis_varlen</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id)</td></tr>
<tr class="memdesc:ga118f7300157d7992459032d851afcd95"><td class="mdescLeft"> </td><td class="mdescRight">Determines whether a packet table contains variable-length or fixed-length packets. <br /></td></tr>
<tr class="separator:ga118f7300157d7992459032d851afcd95"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaa6c6799b38ad7d3f5d02633d61dab58f" id="r_gaa6c6799b38ad7d3f5d02633d61dab58f"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaa6c6799b38ad7d3f5d02633d61dab58f">H5PTget_dataset</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id)</td></tr>
<tr class="memdesc:gaa6c6799b38ad7d3f5d02633d61dab58f"><td class="mdescLeft"> </td><td class="mdescRight">Returns the backend dataset of this packet table. <br /></td></tr>
<tr class="separator:gaa6c6799b38ad7d3f5d02633d61dab58f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafcaf63e9606f70b5cef2b3e6aa394c36" id="r_gafcaf63e9606f70b5cef2b3e6aa394c36"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gafcaf63e9606f70b5cef2b3e6aa394c36">H5PTget_type</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id)</td></tr>
<tr class="memdesc:gafcaf63e9606f70b5cef2b3e6aa394c36"><td class="mdescLeft"> </td><td class="mdescRight">Returns the backend datatype of this packet table. <br /></td></tr>
<tr class="separator:gafcaf63e9606f70b5cef2b3e6aa394c36"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga663f235cfcf8676636224f7b19629513" id="r_ga663f235cfcf8676636224f7b19629513"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga663f235cfcf8676636224f7b19629513">H5PTcreate_index</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id)</td></tr>
<tr class="memdesc:ga663f235cfcf8676636224f7b19629513"><td class="mdescLeft"> </td><td class="mdescRight">Resets a packet table's index to the first packet. <br /></td></tr>
<tr class="separator:ga663f235cfcf8676636224f7b19629513"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga2edb6d88047d4de85c3aaed36b79a57d" id="r_ga2edb6d88047d4de85c3aaed36b79a57d"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga2edb6d88047d4de85c3aaed36b79a57d">H5PTset_index</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> pt_index)</td></tr>
<tr class="memdesc:ga2edb6d88047d4de85c3aaed36b79a57d"><td class="mdescLeft"> </td><td class="mdescRight">Sets a packet table's index. <br /></td></tr>
<tr class="separator:ga2edb6d88047d4de85c3aaed36b79a57d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga7b1e7efcc3bf1f2f9476ec3ff7d24532" id="r_ga7b1e7efcc3bf1f2f9476ec3ff7d24532"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga7b1e7efcc3bf1f2f9476ec3ff7d24532">H5PTget_index</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *pt_index)</td></tr>
<tr class="memdesc:ga7b1e7efcc3bf1f2f9476ec3ff7d24532"><td class="mdescLeft"> </td><td class="mdescRight">Gets the current record index for a packet table. <br /></td></tr>
<tr class="separator:ga7b1e7efcc3bf1f2f9476ec3ff7d24532"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga8b078a7c9898869f8c3a35da40065ad7" id="r_ga8b078a7c9898869f8c3a35da40065ad7"><td class="memItemLeft" align="right" valign="top">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga8b078a7c9898869f8c3a35da40065ad7">H5PTfree_vlen_buff</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> table_id, size_t bufflen, void *buff)</td></tr>
<tr class="memdesc:ga8b078a7c9898869f8c3a35da40065ad7"><td class="mdescLeft"> </td><td class="mdescRight">Releases memory allocated in the process of reading variable-length packets. <br /></td></tr>
<tr class="separator:ga8b078a7c9898869f8c3a35da40065ad7"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<h2 class="groupheader">Function Documentation</h2>
<a id="gae73861e153e86df61f24c5736c9dbb1c" name="gae73861e153e86df61f24c5736c9dbb1c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gae73861e153e86df61f24c5736c9dbb1c">◆ </a></span>H5PTappend()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTappend </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t</td> <td class="paramname"><span class="paramname"><em>nrecords</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void *</td> <td class="paramname"><span class="paramname"><em>data</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Appends packets to the end of a packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of packet table to which packets should be appended </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">nrecords</td><td>Number of packets to be appended </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">data</td><td>Buffer holding data to write</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The <a class="el" href="#gae73861e153e86df61f24c5736c9dbb1c" title="Appends packets to the end of a packet table.">H5PTappend()</a> writes <code>nrecords</code> packets to the end of a packet table specified by <code>table_id</code>. <code>data</code> is a buffer containing the data to be written. For a packet table holding fixed-length packets, this data should be in the packet table's datatype. For a variable-length packet table, the data should be in the form of <a class="el" href="structhvl__t.html">hvl_t</a> structs. </p>
</div>
</div>
<a id="gaf9f4fe7b207aaa7aa63b17cee625c0e2" name="gaf9f4fe7b207aaa7aa63b17cee625c0e2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2">◆ </a></span>H5PTclose()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTclose </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Closes an open packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of packet table to be closed</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The <a class="el" href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2" title="Closes an open packet table.">H5PTclose()</a> ends access to a packet table specified by <code>table_id</code>. </p>
</div>
</div>
<a id="ga1f5ab7315bfb892ea51cc1cbaa78010b" name="ga1f5ab7315bfb892ea51cc1cbaa78010b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga1f5ab7315bfb892ea51cc1cbaa78010b">◆ </a></span>H5PTcreate()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5PTcreate </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>dset_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dtype_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a></td> <td class="paramname"><span class="paramname"><em>chunk_size</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>plist_id</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Creates a packet table to store fixed-length or variable-length packets. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file or group. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">dset_name</td><td>The name of the packet table to create </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">dtype_id</td><td>The datatype of the packet </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">chunk_size</td><td>The size in number of table entries per chunk </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Identifier of the property list. Can be used to specify the compression of the packet table.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an identifier for the new packet table or <a class="el" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a> on error.</dd></dl>
<p>The <a class="el" href="#ga1f5ab7315bfb892ea51cc1cbaa78010b" title="Creates a packet table to store fixed-length or variable-length packets.">H5PTcreate()</a> creates and opens a packet table named <code>dset_name</code> attached to the object specified by the identifier <code>loc_id</code>. The created packet table should be closed with <a class="el" href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2" title="Closes an open packet table.">H5PTclose()</a>, eventually.</p>
<p>The datatype, <code>dtype_id</code>, may specify any datatype, including variable-length data. If <code>dtype_id</code> specifies a compound datatype, one or more fields in that compound type may be variable-length.</p>
<p><code>chunk_size</code> is the size in number of table entries per chunk. Packet table datasets use HDF5 chunked storage to allow them to grow. This value allows the user to set the size of a chunk. The chunk size affects performance.</p>
<dl class="section since"><dt>Since</dt><dd>1.10.0 and 1.8.17 </dd></dl>
</div>
</div>
<a id="gae49bb0e714fd3dfff6141bfb85a331ce" name="gae49bb0e714fd3dfff6141bfb85a331ce"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gae49bb0e714fd3dfff6141bfb85a331ce">◆ </a></span>H5PTcreate_fl()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5PTcreate_fl </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>dset_name</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>dtype_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a></td> <td class="paramname"><span class="paramname"><em>chunk_size</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>compression</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Creates a packet table to store fixed-length packets. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file or group. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">dset_name</td><td>The name of the dataset to create </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">dtype_id</td><td>The datatype of a packet. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">chunk_size</td><td>The size in number of table entries per chunk. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">compression</td><td>The compression level; a value of 0 through 9.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an identifier for the packet table or <a class="el" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a> on error.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000004">Deprecated</a></b></dt><dd>This function was deprecated in favor of the function <a class="el" href="#ga1f5ab7315bfb892ea51cc1cbaa78010b" title="Creates a packet table to store fixed-length or variable-length packets.">H5PTcreate()</a>.</dd></dl>
<p>The <a class="el" href="#gae49bb0e714fd3dfff6141bfb85a331ce" title="Creates a packet table to store fixed-length packets.">H5PTcreate_fl()</a> creates and opens a packet table named <code>dset_name</code> attached to the object specified by the identifier <code>loc_id</code>. It should be closed with <a class="el" href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2" title="Closes an open packet table.">H5PTclose()</a>.</p>
<p>The datatype, <code>dtype_id</code>, may specify any datatype, including variable-length data. If <code>dtype_id</code> specifies a compound datatype, one or more fields in that compound type may be variable-length.</p>
<p><code>chunk_size</code> is the size in number of table entries per chunk. Packet table datasets use HDF5 chunked storage to allow them to grow. This value allows the user to set the size of a chunk. The chunk size affects performance.</p>
<p><code>compression</code> is the compression level, a value of 0 through 9. Level 0 is faster but offers the least compression; level 9 is slower but offers maximum compression. A setting of -1 indicates that no compression is desired. </p>
</div>
</div>
<a id="ga663f235cfcf8676636224f7b19629513" name="ga663f235cfcf8676636224f7b19629513"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga663f235cfcf8676636224f7b19629513">◆ </a></span>H5PTcreate_index()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTcreate_index </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Resets a packet table's index to the first packet. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of packet table whose index should be initialized.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>Each packet table keeps an index of the "current" packet so that <code>get_next</code> can iterate through the packets in order. <a class="el" href="#ga663f235cfcf8676636224f7b19629513" title="Resets a packet table's index to the first packet.">H5PTcreate_index()</a> initializes a packet table's index, and should be called before using <code>get_next</code>. The index must be initialized every time a packet table is created or opened; this information is lost when the packet table is closed. </p>
</div>
</div>
<a id="ga8b078a7c9898869f8c3a35da40065ad7" name="ga8b078a7c9898869f8c3a35da40065ad7"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga8b078a7c9898869f8c3a35da40065ad7">◆ </a></span>H5PTfree_vlen_buff()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTfree_vlen_buff </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t</td> <td class="paramname"><span class="paramname"><em>bufflen</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *</td> <td class="paramname"><span class="paramname"><em>buff</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Releases memory allocated in the process of reading variable-length packets. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Packet table whose memory should be freed. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">bufflen</td><td>Size of <code>buff</code> </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">buff</td><td>Buffer that was used to read in variable-length packets</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>When variable-length packets are read, memory is automatically allocated to hold them, and must be freed. <a class="el" href="#ga8b078a7c9898869f8c3a35da40065ad7" title="Releases memory allocated in the process of reading variable-length packets.">H5PTfree_vlen_buff()</a> frees this memory, and should be called whenever packets are read from a variable-length packet table.</p>
<dl class="section version"><dt>Version</dt><dd>1.10.0 and 1.8.17 Function re-introduced. Function had been removed in 1.8.3. </dd></dl>
</div>
</div>
<a id="gaa6c6799b38ad7d3f5d02633d61dab58f" name="gaa6c6799b38ad7d3f5d02633d61dab58f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaa6c6799b38ad7d3f5d02633d61dab58f">◆ </a></span>H5PTget_dataset()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5PTget_dataset </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Returns the backend dataset of this packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of the packet table</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a dataset identifier or H5I_INVALID_HID on error.</dd></dl>
<p>The <a class="el" href="#gaa6c6799b38ad7d3f5d02633d61dab58f" title="Returns the backend dataset of this packet table.">H5PTget_dataset()</a> returns the identifier of the dataset storing the packet table <code>table_id</code>. This dataset identifier will be closed by <a class="el" href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2" title="Closes an open packet table.">H5PTclose()</a>.</p>
<dl class="section since"><dt>Since</dt><dd>1.10.0 and 1.8.17 </dd></dl>
</div>
</div>
<a id="ga7b1e7efcc3bf1f2f9476ec3ff7d24532" name="ga7b1e7efcc3bf1f2f9476ec3ff7d24532"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga7b1e7efcc3bf1f2f9476ec3ff7d24532">◆ </a></span>H5PTget_index()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTget_index </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *</td> <td class="paramname"><span class="paramname"><em>pt_index</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Gets the current record index for a packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Table identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">pt_index</td><td>Current record index</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The <a class="el" href="#ga7b1e7efcc3bf1f2f9476ec3ff7d24532" title="Gets the current record index for a packet table.">H5PTget_index()</a> returns the current record index <code>pt_index</code> for the table identified by <code>table_id</code>.</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
</div>
</div>
<a id="ga88988f5548b7be3efe20c4af32e6d440" name="ga88988f5548b7be3efe20c4af32e6d440"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga88988f5548b7be3efe20c4af32e6d440">◆ </a></span>H5PTget_next()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTget_next </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t</td> <td class="paramname"><span class="paramname"><em>nrecords</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *</td> <td class="paramname"><span class="paramname"><em>data</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Reads packets from a packet table starting at the current index. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of packet table to read from </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">nrecords</td><td>Number of packets to be read </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">data</td><td>Buffer into which to read data</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The <a class="el" href="#ga88988f5548b7be3efe20c4af32e6d440" title="Reads packets from a packet table starting at the current index.">H5PTget_next()</a> reads <code>nrecords</code> packets starting with the "current index" from a packet table specified by <code>table_id</code>. The packet table's index is set and reset with <a class="el" href="#ga2edb6d88047d4de85c3aaed36b79a57d" title="Sets a packet table's index.">H5PTset_index()</a> and <a class="el" href="#ga663f235cfcf8676636224f7b19629513" title="Resets a packet table's index to the first packet.">H5PTcreate_index()</a>. <code>data</code> is a buffer into which the data should be read.</p>
<p>For a packet table holding variable-length records, the data returned in the buffer will be in form of a <a class="el" href="structhvl__t.html">hvl_t</a> struct containing the length of the data and a pointer to it in memory. The memory used by this data must be freed using <a class="el" href="#ga8b078a7c9898869f8c3a35da40065ad7" title="Releases memory allocated in the process of reading variable-length packets.">H5PTfree_vlen_buff()</a>. </p>
</div>
</div>
<a id="gafcb0b70001557c14840ec58bcb46ba4d" name="gafcb0b70001557c14840ec58bcb46ba4d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gafcb0b70001557c14840ec58bcb46ba4d">◆ </a></span>H5PTget_num_packets()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTget_num_packets </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *</td> <td class="paramname"><span class="paramname"><em>nrecords</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Returns the number of packets in a packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of packet table to query </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">nrecords</td><td>Number of packets in packet table</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The <a class="el" href="#gafcb0b70001557c14840ec58bcb46ba4d" title="Returns the number of packets in a packet table.">H5PTget_num_packets()</a> returns by reference the number of packets in a packet table specified by <code>table_id</code>. </p>
</div>
</div>
<a id="gafcaf63e9606f70b5cef2b3e6aa394c36" name="gafcaf63e9606f70b5cef2b3e6aa394c36"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gafcaf63e9606f70b5cef2b3e6aa394c36">◆ </a></span>H5PTget_type()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5PTget_type </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Returns the backend datatype of this packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of the packet table</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a datatype identifier or H5I_INVALID_HID on error.</dd></dl>
<p>The <a class="el" href="#gafcaf63e9606f70b5cef2b3e6aa394c36" title="Returns the backend datatype of this packet table.">H5PTget_type()</a> returns the identifier of the datatype used by the packet table <code>table_id</code>. This datatype identifier will be closed by <a class="el" href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2" title="Closes an open packet table.">H5PTclose()</a>.</p>
<dl class="section since"><dt>Since</dt><dd>1.10.0 and 1.8.17 </dd></dl>
</div>
</div>
<a id="ga5200eb8cf2d4f8fb5bd455c5e6616a86" name="ga5200eb8cf2d4f8fb5bd455c5e6616a86"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5200eb8cf2d4f8fb5bd455c5e6616a86">◆ </a></span>H5PTis_valid()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTis_valid </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Determines whether an identifier points to a packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier to query</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if <code>table_id</code> is a valid packet table, otherwise returns a negative value.</dd></dl>
<p>The <a class="el" href="#ga5200eb8cf2d4f8fb5bd455c5e6616a86" title="Determines whether an identifier points to a packet table.">H5PTis_valid()</a> returns a non-negative value if <code>table_id</code> corresponds to an open packet table, and returns a negative value otherwise. </p>
</div>
</div>
<a id="ga118f7300157d7992459032d851afcd95" name="ga118f7300157d7992459032d851afcd95"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga118f7300157d7992459032d851afcd95">◆ </a></span>H5PTis_varlen()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTis_varlen </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Determines whether a packet table contains variable-length or fixed-length packets. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Packet table to query</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns 1 for a variable-length packet table, 0 for fixed-length, or a negative value on error.</dd></dl>
<p>The <a class="el" href="#ga118f7300157d7992459032d851afcd95" title="Determines whether a packet table contains variable-length or fixed-length packets.">H5PTis_varlen()</a> returns 1 (TRUE) if <code>table_id</code> is a packet table containing variable-length records. It returns 0 (FALSE) if <code>table_id</code> is a packet table containing fixed-length records. If <code>table_id</code> is not a packet table, a negative value is returned.</p>
<dl class="section version"><dt>Version</dt><dd>1.10.0 and 1.8.17 Function re-introduced. Function had been removed in 1.8.3. </dd></dl>
</div>
</div>
<a id="ga15a7ab544d6147aaf68ae42545f88acf" name="ga15a7ab544d6147aaf68ae42545f88acf"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga15a7ab544d6147aaf68ae42545f88acf">◆ </a></span>H5PTopen()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5PTopen </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>loc_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>dset_name</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Opens an existing packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">loc_id</td><td>Location identifier. The identifier may be that of a file or group. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">dset_name</td><td>The name of the packet table to open</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns an identifier for the packet table or <a class="el" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a> on error.</dd></dl>
<p><a class="el" href="#ga15a7ab544d6147aaf68ae42545f88acf" title="Opens an existing packet table.">H5PTopen()</a> opens an existing packet table in the file or group specified by <code>loc_id</code>. <code>dset_name</code> is the name of the packet table and is used to identify it in the file. This function is used to open both fixed-length packet tables and variable-length packet tables. The packet table should later be closed with <a class="el" href="#gaf9f4fe7b207aaa7aa63b17cee625c0e2" title="Closes an open packet table.">H5PTclose()</a>. </p>
</div>
</div>
<a id="gaf74154d76b4f12b82fc59ed816e98578" name="gaf74154d76b4f12b82fc59ed816e98578"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaf74154d76b4f12b82fc59ed816e98578">◆ </a></span>H5PTread_packets()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTread_packets </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a></td> <td class="paramname"><span class="paramname"><em>start</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t</td> <td class="paramname"><span class="paramname"><em>nrecords</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *</td> <td class="paramname"><span class="paramname"><em>data</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Reads a number of packets from a packet table. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of packet table to read from </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">start</td><td>Packet to start reading from </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">nrecords</td><td>Number of packets to be read </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">data</td><td>Buffer into which to read data.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The <a class="el" href="#gaf74154d76b4f12b82fc59ed816e98578" title="Reads a number of packets from a packet table.">H5PTread_packets()</a> reads <code>nrecords</code> packets starting at packet number <code>start</code> from a packet table specified by <code>table_id</code>. <code>data</code> is a buffer into which the data should be read.</p>
<p>For a packet table holding variable-length records, the data returned in the buffer will be in form of <a class="el" href="structhvl__t.html">hvl_t</a> structs, each containing the length of the data and a pointer to it in memory. The memory used by this data must be freed using <a class="el" href="#ga8b078a7c9898869f8c3a35da40065ad7" title="Releases memory allocated in the process of reading variable-length packets.">H5PTfree_vlen_buff()</a>. </p>
</div>
</div>
<a id="ga2edb6d88047d4de85c3aaed36b79a57d" name="ga2edb6d88047d4de85c3aaed36b79a57d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga2edb6d88047d4de85c3aaed36b79a57d">◆ </a></span>H5PTset_index()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">H5_HLDLL <a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5PTset_index </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a></td> <td class="paramname"><span class="paramname"><em>table_id</em>, </span></td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a></td> <td class="paramname"><span class="paramname"><em>pt_index</em></span> )</td>
</tr>
</table>
</div><div class="memdoc">
<p>Sets a packet table's index. </p>
<hr />
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">table_id</td><td>Identifier of packet table whose index is to be set </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">pt_index</td><td>The packet to which the index should point</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>Each packet table keeps an index of the "current" packet so that <code>get_next</code> can iterate through the packets in order. <a class="el" href="#ga2edb6d88047d4de85c3aaed36b79a57d" title="Sets a packet table's index.">H5PTset_index()</a> sets this index to point to a user-specified packet (the packets are zero-indexed). </p>
</div>
</div>
</div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="footer">Generated by
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.10.0 </li>
</ul>
</div>
</body>
</html>
|
