summaryrefslogtreecommitdiffstats
path: root/src/H5Sselect.c
blob: 52c1636d70cc5adfafcad4c2faf5c77c471a548e (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
/*
 * Copyright (C) 1998 NCSA
 *                    All rights reserved.
 *
 * Programmer:  Quincey Koziol <koziol@ncsa.uiuc.ued>
 *              Friday, May 29, 1998
 *
 * Purpose:	Dataspace functions.
 */

#include <H5private.h>
#include <H5Eprivate.h>
#include <H5Iprivate.h>
#include <H5MMprivate.h>
#include <H5Sprivate.h>
#include <H5Vprivate.h>

/* Interface initialization */
#define PABLO_MASK      H5S_select_mask
#define INTERFACE_INIT  H5S_select_init
static intn             interface_initialize_g = FALSE;
static herr_t		H5S_select_init(void);
static void		H5S_select_term(void);


/*--------------------------------------------------------------------------
 NAME
    H5S_select_init
 PURPOSE
    Initialize selection interface
 USAGE
   herr_t  H5S_select_init(void)
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_init (void)
{
    herr_t		    ret_value = SUCCEED;
    FUNC_ENTER (H5S_select_init, FAIL);

    /* Register the atexit function for this (sub)interface */
    ret_value = H5_add_exit(&H5S_select_term);
    FUNC_LEAVE(ret_value);
}

/*--------------------------------------------------------------------------
 NAME
    H5S_select_term
 PURPOSE
    Terminate various H5S selection objects and free lists
 USAGE
    void H5S_select_term()
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
    Release the selection resources allocated.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
     Can't report errors...
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static void
H5S_select_term(void)
{
}

/*--------------------------------------------------------------------------
 NAME
    H5S_select_copy
 PURPOSE
    Copy a selection from one dataspace to another
 USAGE
    herr_t H5S_select_copy(dst, src)
        H5S_t *dst;  OUT: Pointer to the destination dataspace
        H5S_t *src;  IN: Pointer to the source dataspace
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
    Copies all the selection information (include offset) from the source
    dataspace to the destination dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_select_copy (H5S_t *dst, const H5S_t *src)
{
    herr_t ret_value=SUCCEED;     /* return value */

    FUNC_ENTER (H5S_select_copy, FAIL);

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

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

/* Need to copy order information still */

    /* Copy offset information */
    if (NULL==(dst->select.offset = H5MM_calloc(src->extent.u.simple.rank*sizeof(hssize_t)))) {
        HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL,
		       "memory allocation failed");
    }
    if(src->select.offset!=NULL)
        HDmemcpy(dst->select.offset,src->select.offset,(src->extent.u.simple.rank*sizeof(hssize_t)));

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

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

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

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

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

        case H5S_COMPLEX:
            /*void */
            break;

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

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

    FUNC_ENTER (H5S_select_release, FAIL);

    /* Check args */
    assert (space);

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

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

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

    case H5S_SEL_NONE:           /* Nothing selected */
	break;

    case H5S_SEL_ERROR:
    case H5S_SEL_N:
	break;
    }

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

    FUNC_LEAVE (ret_value);
}   /* H5S_select_release() */

/*--------------------------------------------------------------------------
 NAME
    H5Sselect_hyperslab
 PURPOSE
    Specify a hyperslab to combine with the current hyperslab selection
 USAGE
    herr_t H5Sselect_hyperslab(dsid, op, start, stride, count, block)
        hid_t dsid;             IN: Dataspace ID of selection to modify
        H5S_seloper_t op;       IN: Operation to perform on current selection
        const hssize_t *start;        IN: Offset of start of hyperslab
        const hssize_t *stride;       IN: Hyperslab stride
        const hssize_t *count;        IN: Number of blocks included in hyperslab
        const hssize_t *block;        IN: Size of block in hyperslab
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
    Combines a hyperslab selection with the current selection for a dataspace.
    If the current selection is not a hyperslab, it is freed and the hyperslab
    parameters passed in are combined with the H5S_SEL_ALL hyperslab (ie. a
    selection composing the entire current extent).  Currently, only the
    H5S_SELECT_SET operation is supported.  If STRIDE or BLOCK is NULL, they
    are assumed to be set to all '1'.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5Sselect_hyperslab(hid_t space_id, H5S_seloper_t op,
		     const hssize_t start[/*space_id*/],
		     const hsize_t _stride[/*space_id*/],
		     const hsize_t count[/*space_id*/],
		     const hsize_t _block[/*space_id*/])
{
    H5S_t	*space = NULL;  /* Dataspace to modify selection of */

    FUNC_ENTER (H5Sselect_hyperslab, FAIL);
    H5TRACE6("e","iSs*[a0]Hs*[a0]h*[a0]h*[a0]h",space_id,op,start,_stride,
             count,_block);

    /* Check args */
    if (H5_DATASPACE != H5I_group(space_id) ||
            NULL == (space=H5I_object(space_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }
    if(start==NULL || count==NULL) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "hyperslab not specified");
    }
    if(op!=H5S_SELECT_SET) {
        HRETURN_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL,
            "operations other than H5S_SELECT_SET not supported currently");
    }

    if (H5S_select_hyperslab(space, op, start, _stride, count, _block)<0) {
	HRETURN_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL,
		      "unable to set hyperslab selection");
    }

    FUNC_LEAVE (SUCCEED);
}


/*-------------------------------------------------------------------------
 * Function:	H5S_select_hyperslab
 *
 * Purpose:	Internal version of H5Sselect_hyperslab().
 *
 * Return:	Success:	SUCCEED
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke (split from HSselect_hyperslab()).
 *              Tuesday, August 25, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5S_select_hyperslab (H5S_t *space, H5S_seloper_t op,
		      const hssize_t start[/*space_id*/],
		      const hsize_t stride[/*space_id*/],
		      const hsize_t count[/*space_id*/],
		      const hsize_t block[/*space_id*/])
{
    
    hsize_t *_stride=NULL;        /* Stride array */
    hsize_t *_block=NULL;        /* Block size array */
    hssize_t slab[H5O_LAYOUT_NDIMS]; /* Location of the block to add for strided selections */
    size_t slice[H5O_LAYOUT_NDIMS];	 /* Size of preceding dimension's slice */
    uintn acc;                /* Accumulator for building slices */
    uintn contig;             /* whether selection is contiguous or not */
    int i,j;                  /* Counters */
    H5S_hyper_dim_t *diminfo; /* per-dimension info for the selection */
    herr_t ret_value=FAIL;    /* return value */

    FUNC_ENTER (H5S_select_hyperslab, FAIL);

    /* Check args */
    assert(space);
    assert(start);
    assert(count);
    assert(H5S_SELECT_SET==op);
    
    /* Fill in the correct stride values */
    if(stride==NULL) {
        hssize_t fill=1;

        if((_stride = H5MM_malloc(sizeof(hssize_t)*space->extent.u.simple.rank))==NULL)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                "can't allocate stride vector");
        H5V_array_fill(_stride,&fill,sizeof(hssize_t),space->extent.u.simple.rank);
	stride = _stride;
    }

    /* Fill in the correct block values */
    if(block==NULL) {
        hssize_t fill=1;

        if((_block = H5MM_malloc(sizeof(hssize_t)*space->extent.u.simple.rank))==NULL)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                "can't allocate block vector");
        H5V_array_fill(_block,&fill,sizeof(hssize_t),space->extent.u.simple.rank);
	block = _block;
    }

    /*
     * Check for overlapping blocks (remove when real block-merging algorithm
     * is in place).
     */
    if(op==H5S_SELECT_SET && block!=NULL) {
	for(i=0; i<space->extent.u.simple.rank; i++) {
	    if(stride[i]<block[i]) {
		HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
			    "hyperslab blocks overlap");
	    } /* end if */
	} /* end for */
    } /* end if */

    /* Determine if selection is contiguous */
    /* assume hyperslab is contiguous, until proven otherwise */
    contig=1;
    for(i=0; i<space->extent.u.simple.rank; i++) {
        /* contiguous hyperslabs have the block size equal to the stride */
        if(stride[i]!=block[i]) {
            contig=0;   /* hyperslab isn't contiguous */
            break;      /* no use looking further */
        } /* end if */
    } /* end for */

#ifdef QAK
    printf("%s: check 1.0\n",FUNC);
#endif /* QAK */
    /* If we are setting a new selection, remove current selection first */
    if(op==H5S_SELECT_SET) {
        if(H5S_select_release(space)<0) {
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL,
                "can't release hyperslab");
        } /* end if */
    } /* end if */

    /* Copy all the per-dimension selection info into the space descriptor */
    if((diminfo = H5MM_malloc(sizeof(H5S_hyper_dim_t)*space->extent.u.simple.rank))==NULL) {
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                "can't allocate per-dimension vector");
    } /* end if */
    for(i=0; i<space->extent.u.simple.rank; i++) {
	diminfo[i].start = start[i];
	diminfo[i].stride = stride[i];
	diminfo[i].count = count[i];
	diminfo[i].block = block[i];
    } /* end for */
    space->select.sel_info.hyper.diminfo = diminfo;

#ifdef QAK
    printf("%s: check 2.0\n",FUNC);
#endif /* QAK */
    /* Allocate space for the hyperslab selection information if necessary */
    if(space->select.type!=H5S_SEL_HYPERSLABS ||
       space->select.sel_info.hyper.hyper_lst==NULL) {
        if((space->select.sel_info.hyper.hyper_lst =
	    H5MM_calloc(sizeof(H5S_hyper_list_t)))==NULL)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
			"can't allocate hyperslab information");
        if((space->select.sel_info.hyper.hyper_lst->lo_bounds =
	    H5MM_calloc(space->extent.u.simple.rank*
			sizeof(H5S_hyper_bound_t *)))==NULL)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
			"can't allocate hyperslab lo bound information");
        if((space->select.sel_info.hyper.hyper_lst->hi_bounds =
	    H5MM_calloc(space->extent.u.simple.rank*
			sizeof(H5S_hyper_bound_t *)))==NULL)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
			"can't allocate hyperslab lo bound information");
    } /* end if */

    /* Generate list of blocks to add/remove based on selection operation */

#ifdef QAK
    printf("%s: check 3.0\n",FUNC);
#endif /* QAK */
    /* Add hyperslab to selection */
    if(contig) { /* Check for trivial case */

        /* Account for strides & blocks being equal, but larger than one */
        /* (Why someone would torture us this way, I don't know... -QAK :-) */
        for(i=0; i<space->extent.u.simple.rank; i++)
            slab[i]=count[i]*stride[i];

        /* Add the contiguous hyperslab to the selection */
        if(H5S_hyper_add(space,start,(const hsize_t *)slab)<0) {
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINSERT, FAIL,
                "can't insert hyperslab");
        }
    } else {
        /* Build the slice sizes for each dimension */
        for(i=0, acc=1; i<space->extent.u.simple.rank; i++) {
            slice[i]=acc;
            acc*=count[i];
        } /* end for */

        /* Step through all the blocks to add */
        /* (reuse the count in ACC above) */
        for(i=0; i<(int)acc; i++) {
            /* Build the location of the block */
            for(j=0; j<space->extent.u.simple.rank; j++)
                slab[j]=start[j]+((i/slice[j])%count[j])*stride[j];
            
            /* Add the block to the list of hyperslab selections */
            if(H5S_hyper_add(space,(const hssize_t *)slab,
			     (const hsize_t *)block)<0) {
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINSERT, FAIL,
			    "can't insert hyperslab");
            } /* end if */
        } /* end for */
    } /* end if */

    /* Set selection type */
    space->select.type=H5S_SEL_HYPERSLABS;
    ret_value=SUCCEED;
#ifdef QAK
    printf("%s: check 4.0\n",FUNC);
#endif /* QAK */

done:
    H5MM_xfree(_stride);
    H5MM_xfree(_block);
    FUNC_LEAVE (ret_value);
}


/*--------------------------------------------------------------------------
 NAME
    H5Sselect_elements
 PURPOSE
    Specify a series of elements in the dataspace to select
 USAGE
    herr_t H5Sselect_elements(dsid, op, num_elem, coord)
        hid_t dsid;             IN: Dataspace ID of selection to modify
        H5S_seloper_t op;       IN: Operation to perform on current selection
        size_t num_elem;        IN: Number of elements in COORD array.
        const hssize_t **coord; IN: The location of each element selected
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
    This function selects array elements to be included in the selection for
    the dataspace.  The COORD array is a 2-D array of size <dataspace rank>
    by NUM_ELEM (ie. a list of coordinates in the dataspace).  The order of
    the element coordinates in the COORD array specifies the order that the
    array elements are iterated through when I/O is performed.  Duplicate
    coordinates are not checked for.  The selection operator, OP, determines
    how the new selection is to be combined with the existing selection for
    the dataspace.  Currently, only H5S_SELECT_SET is supported, which replaces
    the existing selection with the one defined in this call.  When operators
    other than H5S_SELECT_SET are used to combine a new selection with an
    existing selection, the selection ordering is reset to 'C' array ordering.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t H5Sselect_elements (hid_t spaceid, H5S_seloper_t op, size_t num_elem,
    const hssize_t **coord)
{
    H5S_t	*space = NULL;  /* Dataspace to modify selection of */
    herr_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5Sselect_elements, FAIL);

    /* Check args */
    if (H5_DATASPACE != H5I_group(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }
    if(coord==NULL || num_elem==0) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "elements not specified");
    } /* end if */
    if(op!=H5S_SELECT_SET) {
        HRETURN_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL,
            "operations other than H5S_SELECT_SET not supported currently");
    } /* end if */

#ifdef QAK
    printf("%s: check 1.0\n",FUNC);
#endif /* QAK */
    /* If we are setting a new selection, remove current selection first */
    if(op==H5S_SELECT_SET) {
        if(H5S_select_release(space)<0) {
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL,
                "can't release hyperslab");
        } /* end if */
    } /* end if */

#ifdef QAK
    printf("%s: check 2.0\n",FUNC);
#endif /* QAK */
    /* Allocate space for the point selection information if necessary */
    if(space->select.type!=H5S_SEL_POINTS || space->select.sel_info.pnt_lst==NULL) {
        if((space->select.sel_info.pnt_lst = H5MM_calloc(sizeof(H5S_pnt_list_t)))==NULL)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                "can't allocate element information");
    } /* end if */

#ifdef QAK
    printf("%s: check 3.0\n",FUNC);
#endif /* QAK */
    /* Add points to selection */
    if(H5S_point_add(space,num_elem,coord)<0) {
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINSERT, FAIL,
            "can't insert elements");
    }

    /* Set selection type */
    space->select.type=H5S_SEL_POINTS;
    ret_value=SUCCEED;
#ifdef QAK
    printf("%s: check 4.0\n",FUNC);
#endif /* QAK */

done:
    FUNC_LEAVE (ret_value);
}   /* H5Sselect_elements() */

/*--------------------------------------------------------------------------
 NAME
    H5Sselect_all
 PURPOSE
    Specify the the entire extent is selected
 USAGE
    herr_t H5Sselect_elements(dsid)
        hid_t dsid;             IN: Dataspace ID of selection to modify
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
    This function selects the entire extent for a dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t H5Sselect_all (hid_t spaceid)
{
    H5S_t	*space = NULL;  /* Dataspace to modify selection of */
    herr_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5Sselect_all, FAIL);

    /* Check args */
    if (H5_DATASPACE != H5I_group(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }

    /* Remove current selection first */
    if(H5S_select_release(space)<0) {
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL,
            "can't release hyperslab");
    } /* end if */

    /* Set selection type */
    space->select.type=H5S_SEL_ALL;
    ret_value=SUCCEED;

done:
    FUNC_LEAVE (ret_value);
}   /* H5Sselect_all() */

/*--------------------------------------------------------------------------
 NAME
    H5Sselect_none
 PURPOSE
    Specify that nothing is selected in the extent
 USAGE
    herr_t H5Sselect_elements(dsid)
        hid_t dsid;             IN: Dataspace ID of selection to modify
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
    This function de-selects the entire extent for a dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t H5Sselect_none (hid_t spaceid)
{
    H5S_t	*space = NULL;  /* Dataspace to modify selection of */
    herr_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5Sselect_none, FAIL);

    /* Check args */
    if (H5_DATASPACE != H5I_group(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space");
    }

    /* Remove current selection first */
    if(H5S_select_release(space)<0) {
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTDELETE, FAIL,
            "can't release hyperslab");
    } /* end if */

    /* Set selection type */
    space->select.type=H5S_SEL_NONE;
    ret_value=SUCCEED;

done:
    FUNC_LEAVE (ret_value);
}   /* H5Sselect_none() */

/*--------------------------------------------------------------------------
 NAME
    H5Sselect_npoints
 PURPOSE
    Get the number of elements in current selection
 USAGE
    hsize_t H5Sselect_npoints(dsid)
        hid_t dsid;             IN: Dataspace ID of selection to query
 RETURNS
    The number of elements in selection on success, 0 on failure
 DESCRIPTION
    Returns the number of elements in current selection for dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
hsize_t
H5Sselect_npoints(hid_t spaceid)
{
    H5S_t	*space = NULL;      /* Dataspace to modify selection of */
    hsize_t ret_value=0;        /* return value */

    FUNC_ENTER (H5Sselect_npoints, 0);
    H5TRACE1("h","i",spaceid);

    /* Check args */
    if (H5_DATASPACE != H5I_group(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a data space");
    }

    ret_value = H5S_select_npoints(space);

    FUNC_LEAVE (ret_value);
}   /* H5Sselect_npoints() */

/*--------------------------------------------------------------------------
 NAME
    H5S_select_npoints
 PURPOSE
    Get the number of elements in current selection
 USAGE
    herr_t H5Sselect_hyperslab(ds)
        H5S_t *ds;             IN: Dataspace pointer
 RETURNS
    The number of elements in selection on success, 0 on failure
 DESCRIPTION
    Returns the number of elements in current selection for dataspace.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
hsize_t
H5S_select_npoints (const H5S_t *space)
{
    herr_t ret_value=FAIL;  /* return value */

    FUNC_ENTER (H5S_select_npoints, FAIL);

    assert(space);

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

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

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

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

    case H5S_SEL_ERROR:
    case H5S_SEL_N:
	break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5Sselect_npoints() */

/*--------------------------------------------------------------------------
 NAME
    H5S_sel_iter_release
 PURPOSE
    Release selection iterator information for a dataspace
 USAGE
    herr_t H5S_sel_iter_release(sel_iter)
        const H5S_t *space;             IN: Pointer to dataspace iterator is for
        H5S_sel_iter_t *sel_iter;       IN: Pointer to selection iterator
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
    Releases all information for a dataspace selection iterator
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
herr_t
H5S_sel_iter_release (const H5S_t *space, H5S_sel_iter_t *sel_iter)
{
    herr_t ret_value=SUCCEED;     /* Return value */

    FUNC_ENTER (H5S_sel_iter_release, FAIL);

    /* Check args */
    assert (sel_iter);

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

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

    case H5S_SEL_NONE:           /* Nothing selected */
	break;

    case H5S_SEL_ERROR:
    case H5S_SEL_N:
	break;
    }

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

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

    /* Check args */
    if (H5_DATASPACE != H5I_group(spaceid) ||
            NULL == (space=H5I_object(spaceid))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a data space");
    }

    ret_value = H5S_select_valid(space);

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

    FUNC_ENTER (H5S_select_valid, FAIL);

    assert(space);

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

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

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

    case H5S_SEL_ERROR:
    case H5S_SEL_N:
	break;
    }

    FUNC_LEAVE (ret_value);
}   /* H5S_select_valid() */