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93 lines
3.7 KiB
C
93 lines
3.7 KiB
C
3 weeks ago
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://www.hdfgroup.org/licenses. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/*
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* The example below illustrates the use of the new API with files that are
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* opened read-only. Created references to the objects in that file are
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* stored into a separate file, and accessed from that file, without the user
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* explicitly opening the original file that was referenced.
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*/
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#include <stdlib.h>
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#include "hdf5.h"
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#include <assert.h>
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#define H5FILE_NAME1 "refer_extern1.h5"
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#define H5FILE_NAME2 "refer_extern2.h5"
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#define NDIMS 1 /* Number of dimensions */
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#define BUF_SIZE 4 /* Size of example buffer */
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#define NREFS 1 /* Number of references */
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int
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main(void)
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{
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hid_t file1, dset1, space1;
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hsize_t dset1_dims[NDIMS] = {BUF_SIZE};
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int dset_buf[BUF_SIZE];
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hid_t file2, dset2, space2;
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hsize_t dset2_dims[NDIMS] = {NREFS};
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H5R_ref_t ref_buf[NREFS] = {0};
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H5O_type_t obj_type;
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int i;
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for (i = 0; i < BUF_SIZE; i++)
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dset_buf[i] = i;
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/* Create file with one dataset and close it */
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file1 = H5Fcreate(H5FILE_NAME1, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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space1 = H5Screate_simple(NDIMS, dset1_dims, NULL);
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dset1 = H5Dcreate2(file1, "dataset1", H5T_NATIVE_INT, space1, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
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H5Dwrite(dset1, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset_buf);
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H5Dclose(dset1);
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H5Sclose(space1);
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H5Fclose(file1);
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/* Create reference to dataset1 in "refer_extern1.h5" */
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file1 = H5Fopen(H5FILE_NAME1, H5F_ACC_RDONLY, H5P_DEFAULT);
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H5Rcreate_object(file1, "dataset1", H5P_DEFAULT, &ref_buf[0]);
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H5Fclose(file1);
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/* Store reference in dataset in separate file "refer_extern2.h5" */
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file2 = H5Fcreate(H5FILE_NAME2, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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space2 = H5Screate_simple(NDIMS, dset2_dims, NULL);
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dset2 = H5Dcreate2(file2, "references", H5T_STD_REF, space2, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
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H5Dwrite(dset2, H5T_STD_REF, H5S_ALL, H5S_ALL, H5P_DEFAULT, ref_buf);
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H5Dclose(dset2);
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H5Sclose(space2);
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H5Fclose(file2);
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H5Rdestroy(&ref_buf[0]);
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/* Read reference back from "refer_extern2.h5" */
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file2 = H5Fopen(H5FILE_NAME2, H5F_ACC_RDONLY, H5P_DEFAULT);
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dset2 = H5Dopen2(file2, "references", H5P_DEFAULT);
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H5Dread(dset2, H5T_STD_REF, H5S_ALL, H5S_ALL, H5P_DEFAULT, ref_buf);
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H5Dclose(dset2);
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H5Fclose(file2);
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/* Access reference and read dataset data without opening original file */
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assert(H5Rget_type((const H5R_ref_t *)&ref_buf[0]) == H5R_OBJECT2);
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H5Rget_obj_type3(&ref_buf[0], H5P_DEFAULT, &obj_type);
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assert(obj_type == H5O_TYPE_DATASET);
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dset1 = H5Ropen_object(&ref_buf[0], H5P_DEFAULT, H5P_DEFAULT);
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H5Dread(dset1, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset_buf);
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H5Dclose(dset1);
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H5Rdestroy(&ref_buf[0]);
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for (i = 0; i < BUF_SIZE; i++)
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assert(dset_buf[i] == i);
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return 0;
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}
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