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+/************************************************************
+
+ 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 "vds-excalibur.h5"
+#define DATASET "VDS-excalibur"
+#define VDSDIM1 6
+#define VDSDIM0 15
+#define KDIM0 2
+#define KDIM1 6
+#define NDIM0 3
+#define NDIM1 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] = {0,VDSDIM0, VDSDIM1},
+ vdsdims_max[3] = {H5S_UNLIMITED,VDSDIM0, VDSDIM1},
+ kdims[3] = {0, KDIM0, KDIM1},
+ kdims_max[3] = {H5S_UNLIMITED, KDIM0, KDIM1},
+ ndims[3] = {0, NDIM0, NDIM1},
+ ndims_max[3] = {H5S_UNLIMITED, NDIM0, NDIM1},
+ 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;
+ hsize_t nblocks;
+ hsize_t *buf; /* Buffer to hold hyperslab coordinates */
+
+
+ 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] = VDSDIM1;
+
+ /*
+ * Build the mappings for A, C and E source datasets.
+ *
+ */
+ for (i = 0; i < 3; i++) {
+ start[0] = (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 block[1] */
+ block[1] = n;
+ /*
+ * Build the mappings for B, D and F source datasets.
+ *
+ */
+ for (i = 0; i < 3; i++) {
+ start[0] = (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 = H5Dcreate (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 = H5Dopen (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 %d\n", 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 = [%d, %d, %d] \n", (int)start_out[0], (int)start_out[1], (int)start_out[2]);
+ printf(" stride = [%d, %d, %d] \n", (int)stride_out[0], (int)stride_out[1], (int)stride_out[2]);
+ printf(" count = [%d, %d, %d] \n", (int)count_out[0], (int)count_out[1], (int)count_out[2]);
+ printf(" block = [%d, %d, %d] \n", (int)block_out[0], (int)block_out[1], (int)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 ");
+ src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
+ if(H5Sget_select_type(src_space) == H5S_SEL_ALL) {
+ printf("H5S_ALL \n");
+ }
+ H5Sclose(vspace);
+ H5Sclose(src_space);
+ free(filename);
+ free(dsetname);
+ }
+
+ /*
+ * Close and release resources.
+ */
+ status = H5Pclose (dcpl);
+ status = H5Dclose (dset);
+ status = H5Fclose (file);
+
+ return 0;
+}
+