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hdf5/examples/h5_vds-exc.c
lrknox b9a27fddaa Merge pull request #407 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_10_1 to hdf5_1_10_1 
* commit '0d05cb607e5951f3a28a101be56ca194022a7fa1':
  Reverted addition of The HDF Group copyright headers to 3rd party CMake files for Java.
  Add Copyright headers to 90 files (mostly .cmake files) without Copyright headers.
  Add "Copyright by The HDF Group."" to copyright header.
2017-04-14 16:40:52 -05:00

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/************************************************************
This example illustrates the concept of the virtual dataset.
Excalibur use case with k=2 and m=3.
This file is intended for use with HDF5 Library version 1.10
************************************************************/
/* EIP Add link to the picture */
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "vds-exc.h5"
#define DATASET "VDS-Excalibur"
#define VDSDIM0 0
#define VDSDIM1 15
#define VDSDIM2 6
#define KDIM0 0
#define KDIM1 2
#define KDIM2 6
#define NDIM0 0
#define NDIM1 3
#define NDIM2 6
#define RANK 3
const char *SRC_FILE[] = {
"a.h5",
"b.h5",
"c.h5",
"d.h5",
"e.h5",
"f.h5"
};
const char *SRC_DATASET[] = {
"A",
"B",
"C",
"D",
"E",
"F"
};
int
main (void)
{
hid_t file, space, ksrc_space, nsrc_space, vspace,
src_space,
dset; /* Handles */
hid_t dcpl;
herr_t status;
hsize_t vdsdims[3] = {VDSDIM0, VDSDIM1, VDSDIM2},
vdsdims_max[3] = {H5S_UNLIMITED,VDSDIM1, VDSDIM2},
kdims[3] = {KDIM0, KDIM1, KDIM2},
kdims_max[3] = {H5S_UNLIMITED, KDIM1, KDIM2},
ndims[3] = {NDIM0, NDIM1, NDIM2},
ndims_max[3] = {H5S_UNLIMITED, NDIM1, NDIM2},
start[3], /* Hyperslab parameters */
stride[3],
count[3],
block[3];
hsize_t start_out[3],
stride_out[3],
count_out[3],
block_out[3];
int k = 2;
int n = 3;
int i;
H5D_layout_t layout; /* Storage layout */
size_t num_map; /* Number of mappings */
ssize_t len; /* Length of the string; also a return value */
char *filename;
char *dsetname;
file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create VDS dataspace. */
space = H5Screate_simple (RANK, vdsdims, vdsdims_max);
/* Create dataspaces for A, C, and E datasets. */
ksrc_space = H5Screate_simple (RANK, kdims, kdims_max);
/* Create dataspaces for B, D, and F datasets. */
nsrc_space = H5Screate_simple (RANK, ndims, ndims_max);
/* Create VDS creation property */
dcpl = H5Pcreate (H5P_DATASET_CREATE);
/* Initialize hyperslab values */
start[0] = 0;
start[1] = 0;
start[2] = 0;
count[0] = H5S_UNLIMITED;
count[1] = 1;
count[2] = 1;
block[0] = 1;
block[1] = k;
block[2] = VDSDIM2;
/*
* Build the mappings for A, C and E source datasets.
* Unlimited hyperslab selection is the same in the source datasets.
* Unlimited hyperslab selections in the virtual dataset have different offsets.
*/
status = H5Sselect_hyperslab (ksrc_space, H5S_SELECT_SET, start, NULL, count, block);
for (i = 0; i < 3; i++) {
start[1] = (hsize_t)((k+n)*i);
status = H5Sselect_hyperslab (space, H5S_SELECT_SET, start, NULL, count, block);
status = H5Pset_virtual (dcpl, space, SRC_FILE[2*i], SRC_DATASET[2*i], ksrc_space);
}
/* Reinitialize start[1] and block[1] to build the second set of mappings. */
start[1] = 0;
block[1] = n;
/*
* Build the mappings for B, D and F source datasets.
* Unlimited hyperslab selection is the same in the source datasets.
* Unlimited hyperslab selections in the virtual dataset have different offsets.
*/
status = H5Sselect_hyperslab (nsrc_space, H5S_SELECT_SET, start, NULL, count, block);
for (i = 0; i < 3; i++) {
start[1] = (hsize_t)(k+(k+n)*i);
status = H5Sselect_hyperslab (space, H5S_SELECT_SET, start, NULL, count, block);
status = H5Pset_virtual (dcpl, space, SRC_FILE[2*i+1], SRC_DATASET[2*i+1], nsrc_space);
}
/* Create a virtual dataset */
dset = H5Dcreate2 (file, DATASET, H5T_NATIVE_INT, space, H5P_DEFAULT,
dcpl, H5P_DEFAULT);
status = H5Sclose (space);
status = H5Sclose (nsrc_space);
status = H5Sclose (ksrc_space);
status = H5Dclose (dset);
status = H5Fclose (file);
/*
* Now we begin the read section of this example.
*/
/*
* Open file and dataset using the default properties.
*/
file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
dset = H5Dopen2 (file, DATASET, H5P_DEFAULT);
/*
* Get creation property list and mapping properties.
*/
dcpl = H5Dget_create_plist (dset);
/*
* Get storage layout.
*/
layout = H5Pget_layout (dcpl);
if (H5D_VIRTUAL == layout)
printf(" Dataset has a virtual layout \n");
else
printf("Wrong layout found \n");
/*
* Find number of mappings.
*/
status = H5Pget_virtual_count (dcpl, &num_map);
printf(" Number of mappings is %lu\n", (unsigned long)num_map);
/*
* Get mapping parameters for each mapping.
*/
for (i = 0; i < (int)num_map; i++) {
printf(" Mapping %d \n", i);
printf(" Selection in the virtual dataset \n");
/* Get selection in the virttual dataset */
vspace = H5Pget_virtual_vspace (dcpl, (size_t)i);
if (H5Sget_select_type(vspace) == H5S_SEL_HYPERSLABS) {
if (H5Sis_regular_hyperslab(vspace)) {
status = H5Sget_regular_hyperslab (vspace, start_out, stride_out, count_out, block_out);
printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]);
printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]);
printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]);
printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]);
}
}
/* Get source file name */
len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0);
filename = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1);
printf(" Source filename %s\n", filename);
/* Get source dataset name */
len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0);
dsetname = (char *)malloc((size_t)len*sizeof(char)+1);
H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1);
printf(" Source dataset name %s\n", dsetname);
/* Get selection in the source dataset */
printf(" Selection in the source dataset \n");
src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
if (H5Sget_select_type(src_space) == H5S_SEL_HYPERSLABS) {
if (H5Sis_regular_hyperslab(vspace)) {
status = H5Sget_regular_hyperslab (src_space, start_out, stride_out, count_out, block_out);
printf(" start = [%llu, %llu, %llu] \n", (unsigned long long)start_out[0], (unsigned long long)start_out[1], (unsigned long long)start_out[2]);
printf(" stride = [%llu, %llu, %llu] \n", (unsigned long long)stride_out[0], (unsigned long long)stride_out[1], (unsigned long long)stride_out[2]);
printf(" count = [%llu, %llu, %llu] \n", (unsigned long long)count_out[0], (unsigned long long)count_out[1], (unsigned long long)count_out[2]);
printf(" block = [%llu, %llu, %llu] \n", (unsigned long long)block_out[0], (unsigned long long)block_out[1], (unsigned long long)block_out[2]);
}
}
H5Sclose(vspace);
H5Sclose(src_space);
free(filename);
free(dsetname);
}
/* EIP read data back */
/*
* Close and release resources.
*/
status = H5Pclose (dcpl);
status = H5Dclose (dset);
status = H5Fclose (file);
return 0;
}
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