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authorAllen Byrne <50328838+byrnHDF@users.noreply.github.com>2024-01-03 17:23:42 (GMT)
committerGitHub <noreply@github.com>2024-01-03 17:23:42 (GMT)
commit72e33ad7727765fd162a1f70ca502cc2437aabde (patch)
tree84b4cff56687fa7a8d443a529984932dd30a7fa4 /examples/h5_vds-simpleIO.c
parent95827bc79d592ad5aa71ec3199a83ede9b324c20 (diff)
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Merge examples and workflows from develop (#3918)
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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 virtual dataset I/O
- The program creates 2-dim source dataset and writes
- data to it. Then it creates 2-dim virtual dataset that has
- the same dimension sizes and maps the all elements of the
- virtual dataset to all elements of the source dataset.
- Then VDS is read back.
-
- 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-simpleIO.h5"
-#define DATASET "VDS"
-#define DIM1 6
-#define DIM0 4
-#define RANK 2
-
-#define SRC_FILE "a.h5"
-#define SRC_DATASET "/A"
-
-int
-main(void)
-{
- hid_t file, space, src_space, vspace, dset; /* Handles */
- hid_t dcpl;
- herr_t status;
- hsize_t vdsdims[2] = {DIM0, DIM1}, /* Virtual dataset dimension */
- dims[2] = {DIM0, DIM1}; /* Source dataset dimensions */
- int wdata[DIM0][DIM1], /* Write buffer for source dataset */
- rdata[DIM0][DIM1], /* Read buffer for virtual dataset */
- i, j;
- 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;
- /*
- * Initialize data.
- */
- for (i = 0; i < DIM0; i++)
- for (j = 0; j < DIM1; j++)
- wdata[i][j] = i + 1;
-
- /*
- * Create the source file and the dataset. Write data to the source dataset
- * and close all resources.
- */
-
- file = H5Fcreate(SRC_FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
- space = H5Screate_simple(RANK, dims, NULL);
- dset = H5Dcreate2(file, SRC_DATASET, H5T_NATIVE_INT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
- status = H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata[0]);
- status = H5Sclose(space);
- status = H5Dclose(dset);
- status = H5Fclose(file);
-
- /* Create file in which virtual dataset will be stored. */
- file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
-
- /* Create VDS dataspace. */
- vspace = H5Screate_simple(RANK, vdsdims, NULL);
-
- /* Set VDS creation property. */
- dcpl = H5Pcreate(H5P_DATASET_CREATE);
-
- /*
- * Build the mappings.
- * Selections in the source datasets are H5S_ALL.
- * In the virtual dataset we select the first, the second and the third rows
- * and map each row to the data in the corresponding source dataset.
- */
- src_space = H5Screate_simple(RANK, dims, NULL);
- status = H5Pset_virtual(dcpl, vspace, SRC_FILE, SRC_DATASET, src_space);
-
- /* Create a virtual dataset. */
- dset = H5Dcreate2(file, DATASET, H5T_NATIVE_INT, vspace, H5P_DEFAULT, dcpl, H5P_DEFAULT);
- status = H5Sclose(vspace);
- status = H5Sclose(src_space);
- status = H5Dclose(dset);
- status = H5Fclose(file);
-
- /*
- * Now we begin the read section of this example.
- */
-
- /*
- * Open the file and virtual dataset.
- */
- 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 ");
- /* Get selection in the virtual dataset */
- vspace = H5Pget_virtual_vspace(dcpl, (size_t)i);
-
- /* Make sure it is ALL selection and then print selection. */
- if (H5Sget_select_type(vspace) == H5S_SEL_ALL) {
- printf("Selection is H5S_ALL \n");
- }
- /* 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 ");
- src_space = H5Pget_virtual_srcspace(dcpl, (size_t)i);
-
- /* Make sure it is ALL selection and then print selection. */
- if (H5Sget_select_type(src_space) == H5S_SEL_ALL) {
- printf("Selection is H5S_ALL \n");
- }
- 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 < DIM0; i++) {
- printf(" [");
- for (j = 0; j < DIM1; j++)
- printf(" %3d", rdata[i][j]);
- printf("]\n");
- }
- /*
- * Close and release resources.
- */
- status = H5Pclose(dcpl);
- status = H5Dclose(dset);
- status = H5Fclose(file);
-
- return 0;
-}