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Diffstat (limited to 'HDF5Examples/C/H5VDS/h5ex_vds-exc.c')
| -rw-r--r-- | HDF5Examples/C/H5VDS/h5ex_vds-exc.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/HDF5Examples/C/H5VDS/h5ex_vds-exc.c b/HDF5Examples/C/H5VDS/h5ex_vds-exc.c new file mode 100644 index 0000000..10bb68c --- /dev/null +++ b/HDF5Examples/C/H5VDS/h5ex_vds-exc.c @@ -0,0 +1,245 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * 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; +} |