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+/************************************************************
+
+ This example illustrates the concept of the virtual dataset.
+ Percival use case. Every fifth 10x10 plane in VDS is stored in
+ the corresponding 3D unlimited dataset.
+ There are 4 source datasets total.
+ 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-percival-unlim.h5"
+#define DATASET "VDS-Percival-unlim"
+#define VDSDIM0 H5S_UNLIMITED
+#define VDSDIM1 10
+#define VDSDIM2 10
+
+#define DIM0 H5S_UNLIMITED
+#define DIM0_1 10 /* Initial size of the datasets */
+#define DIM1 10
+#define DIM2 10
+#define RANK 3
+#define PLANE_STRIDE 4
+
+const char *SRC_FILE[] = {
+ "a.h5",
+ "b.h5",
+ "c.h5",
+ "d.h5"
+};
+
+const char *SRC_DATASET[] = {
+ "A",
+ "B",
+ "C",
+ "D"
+};
+
+int
+main (void)
+{
+ hid_t vfile, file, src_space, mem_space, vspace,
+ vdset, dset; /* Handles */
+ hid_t dcpl;
+ herr_t status;
+ hsize_t vdsdims[3] = {4*DIM0_1, VDSDIM1, VDSDIM2},
+ vdsdims_max[3] = {VDSDIM0, VDSDIM1, VDSDIM2},
+ dims[3] = {DIM0_1, DIM1, DIM2},
+ extdims[3] = {2*DIM0_1, DIM1, DIM2},
+ chunk_dims[3] = {DIM0_1, DIM1, DIM2},
+ dims_max[3] = {DIM0, DIM1, DIM2},
+ vdsdims_out[3],
+ vdsdims_max_out[3],
+ start[3], /* Hyperslab parameters */
+ stride[3],
+ count[3],
+ src_count[3],
+ block[3];
+ hsize_t start_out[3], /* Hyperslab parameter out */
+ stride_out[3],
+ count_out[3],
+ block_out[3];
+ int 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;
+ int wdata[DIM0_1*DIM1*DIM2];
+
+ /*
+ * Create source files and datasets. This step is optional.
+ */
+ for (i=0; i < PLANE_STRIDE; i++) {
+ /*
+ * Initialize data for i-th source dataset.
+ */
+ for (j = 0; j < DIM0_1*DIM1*DIM2; j++) wdata[j] = i+1;
+
+ /*
+ * Create the source files and datasets. Write data to each dataset and
+ * close all resources.
+ */
+
+ file = H5Fcreate (SRC_FILE[i], H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+ src_space = H5Screate_simple (RANK, dims, dims_max);
+ dcpl = H5Pcreate(H5P_DATASET_CREATE);
+ status = H5Pset_chunk (dcpl, RANK, chunk_dims);
+ dset = H5Dcreate (file, SRC_DATASET[i], H5T_NATIVE_INT, src_space, H5P_DEFAULT,
+ dcpl, H5P_DEFAULT);
+ status = H5Dwrite (dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
+ wdata);
+ status = H5Sclose (src_space);
+ status = H5Pclose (dcpl);
+ status = H5Dclose (dset);
+ status = H5Fclose (file);
+ }
+
+ file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+ /* Create VDS dataspace. */
+ vspace = H5Screate_simple (RANK, vdsdims, vdsdims_max);
+
+ /* Create dataspaces for the source dataset. */
+ src_space = H5Screate_simple (RANK, dims, dims_max);
+
+ /* Create VDS creation property */
+ dcpl = H5Pcreate (H5P_DATASET_CREATE);
+
+ /* Initialize hyperslab values */
+
+ start[0] = 0;
+ start[1] = 0;
+ start[2] = 0;
+ stride[0] = PLANE_STRIDE; /* we will select every fifth plane in VDS */
+ stride[1] = 1;
+ stride[2] = 1;
+ count[0] = H5S_UNLIMITED;
+ count[1] = 1;
+ count[2] = 1;
+ src_count[0] = H5S_UNLIMITED;
+ src_count[1] = 1;
+ src_count[2] = 1;
+ block[0] = 1;
+ block[1] = DIM1;
+ block[2] = DIM2;
+
+ /*
+ * Build the mappings
+ *
+ */
+ status = H5Sselect_hyperslab (src_space, H5S_SELECT_SET, start, NULL, src_count, block);
+ for (i=0; i < PLANE_STRIDE; i++) {
+ status = H5Sselect_hyperslab (vspace, H5S_SELECT_SET, start, stride, count, block);
+ status = H5Pset_virtual (dcpl, vspace, SRC_FILE[i], SRC_DATASET[i], src_space);
+ start[0]++;
+ }
+
+ H5Sselect_none(vspace);
+
+ /* Create a virtual dataset */
+ vdset = H5Dcreate (vfile, DATASET, H5T_NATIVE_INT, vspace, H5P_DEFAULT,
+ dcpl, H5P_DEFAULT);
+ status = H5Sclose (vspace);
+ status = H5Sclose (src_space);
+ /* Let's get space of the VDS and its dimension; we should get 40x10x10 */
+ vspace = H5Dget_space (vdset);
+ H5Sget_simple_extent_dims (vspace, vdsdims_out, vdsdims_max_out);
+ printf ("VDS dimensions first time \n");
+ printf (" Current: ");
+ for (i=0; i<RANK; i++)
+ printf (" %d ", (int)vdsdims_out[i]);
+ printf ("\n");
+
+ /* Let's add data to the source datasets and check new dimensions for VDS */
+
+ for (i=0; i < PLANE_STRIDE; i++) {
+ /*
+ * Initialize data for i-th source dataset.
+ */
+ for (j = 0; j < DIM0_1*DIM1*DIM2; j++) wdata[j] = 10*(i+1);
+
+ /*
+ * Create the source files and datasets. Write data to each dataset and
+ * close all resources.
+ */
+
+ file = H5Fopen (SRC_FILE[i], H5F_ACC_RDWR, H5P_DEFAULT);
+ dset = H5Dopen (file, SRC_DATASET[i], H5P_DEFAULT);
+ status = H5Dset_extent (dset, extdims);
+ src_space = H5Dget_space (dset);
+ start[0] = DIM0_1;
+ start[1] = 0;
+ start[2] = 0;
+ count[0] = 1;
+ count[1] = 1;
+ count[2] = 1;
+ block[0] = DIM0_1;
+ block[1] = DIM1;
+ block[2] = DIM2;
+
+ mem_space = H5Screate_simple(RANK, dims, NULL);
+ status = H5Sselect_hyperslab (src_space, H5S_SELECT_SET, start, NULL, count, block);
+ status = H5Dwrite (dset, H5T_NATIVE_INT, mem_space, src_space, H5P_DEFAULT,
+ wdata);
+ status = H5Sclose (src_space);
+ status = H5Pclose (dcpl);
+ status = H5Dclose (dset);
+ status = H5Fclose (file);
+ }
+
+ /* Let's get space of the VDS and its dimension; we should get 80x10x10 */
+ vspace = H5Dget_space (dset);
+ H5Sget_simple_extent_dims (vspace, vdsdims_out, vdsdims_max_out);
+ printf ("VDS dimensions second time \n");
+ printf (" Current: ");
+ for (i=0; i<RANK; i++)
+ printf (" %d ", (int)vdsdims_out[i]);
+ printf ("\n");
+
+ status = H5Dclose (vdset);
+ status = H5Fclose (vfile);
+
+ /*
+ * Now we begin the read section of this example.
+ */
+
+ /*
+ * Open file and dataset using the default properties.
+ */
+ vfile = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
+ vdset = H5Dopen (vfile, DATASET, H5P_DEFAULT);
+
+ /*
+ * Get creation property list and mapping properties.
+ */
+ dcpl = H5Dget_create_plist (vdset);
+
+ /*
+ * 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(src_space)) {
+ 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);
+ }
+ /*
+ * Close and release resources.
+ */
+ status = H5Pclose (dcpl);
+ status = H5Dclose (vdset);
+ status = H5Fclose (vfile);
+ return 0;
+}
+