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