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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://www.hdfgroup.org/licenses. *
* 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
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "h5ex_vds-exc.h5"
#define DATASET "VDS-Excalibur"
#define VDSDIM0 0
#define VDSDIM1 15
#define VDSDIM2 6
#define LDIM0 0
#define LDIM1 2
#define LDIM2 6
#define NDIM0 0
#define NDIM1 3
#define NDIM2 6
#define RANK 3
const char *SRC_FILE[] = {"ae.h5", "be.h5", "ce.h5", "de.h5", "ee.h5", "fe.h5"};
const char *SRC_DATASET[] = {"A", "B", "C", "D", "E", "F"};
int
main(void)
{
hid_t file = H5I_INVALID_HID;
hid_t space = H5I_INVALID_HID;
hid_t dset = H5I_INVALID_HID;
hid_t src_space = H5I_INVALID_HID;
hid_t lsrc_space = H5I_INVALID_HID;
hid_t nsrc_space = H5I_INVALID_HID;
hid_t vspace = H5I_INVALID_HID;
hid_t dcpl = H5I_INVALID_HID;
herr_t status;
hsize_t vdsdims[3] = {VDSDIM0, VDSDIM1, VDSDIM2};
hsize_t vdsdims_max[3] = {H5S_UNLIMITED, VDSDIM1, VDSDIM2};
hsize_t ldims[3] = {LDIM0, LDIM1, LDIM2};
hsize_t ldims_max[3] = {H5S_UNLIMITED, LDIM1, LDIM2};
hsize_t ndims[3] = {NDIM0, NDIM1, NDIM2};
hsize_t ndims_max[3] = {H5S_UNLIMITED, NDIM1, NDIM2};
hsize_t start[3], count[3], block[3]; /* Hyperslab parameters */
hsize_t start_out[3], stride_out[3], count_out[3], block_out[3];
int rdata[40][VDSDIM1][VDSDIM2]; /* Read buffer for virtual dataset */
int l = 2;
int n = 3;
int i, j, k;
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 = NULL;
char *dsetname = NULL;
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. */
lsrc_space = H5Screate_simple(RANK, ldims, ldims_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] = l;
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(lsrc_space, H5S_SELECT_SET, start, NULL, count, block);
for (i = 0; i < 3; i++) {
start[1] = (hsize_t)((l + 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], lsrc_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)(l + (l + 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(lsrc_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 the 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 virtual dataset */
vspace = H5Pget_virtual_vspace(dcpl, (size_t)i);
/* Make sure that this is a hyperslab selection and then print information. */
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);
}
/*
* Read the data using the default properties.
*/
status = H5Dread(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata[0]);
/*
* Output the data to the screen.
*/
printf(" VDS Data:\n");
for (i = 0; i < VDSDIM0; i++) {
printf(" [");
for (j = 0; j < VDSDIM1; j++) {
printf(" [");
for (k = 0; k < VDSDIM1; k++)
printf(" %3d", rdata[i][j][k]);
printf("]");
}
printf("]\n");
}
/*
* Close and release resources.
*/
status = H5Pclose(dcpl);
status = H5Dclose(dset);
status = H5Fclose(file);
return 0;
}
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