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/* -*- c-file-style: "stroustrup" -*- */
#include "hdf5.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
int
main(void)
{
int ret_val = EXIT_SUCCESS;
//! <!-- [create] -->
{
__label__ fail_file, fail_fspace, fail_dset, fail_sel, fail_aspace, fail_attr, fail_awrite;
hid_t file, fspace, dset, aspace, attr;
H5R_ref_t ref;
if ((file = H5Fcreate("reference.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_file;
}
// create a region reference which selects all elements of the dataset at "/data"
if ((fspace = H5Screate_simple(2, (hsize_t[]){10, 20}, NULL)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_fspace;
}
if ((dset = H5Dcreate(file, "data", H5T_STD_I32LE, fspace, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) ==
H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_dset;
}
if (H5Sselect_all(fspace) < 0 || H5Rcreate_region(file, "data", fspace, H5P_DEFAULT, &ref) < 0) {
ret_val = EXIT_FAILURE;
goto fail_sel;
}
// store the region reference in a scalar attribute of the root group called "region"
if ((aspace = H5Screate(H5S_SCALAR)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_aspace;
}
if ((attr = H5Acreate(file, "region", H5T_STD_REF, aspace, H5P_DEFAULT, H5P_DEFAULT)) ==
H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_attr;
}
if (H5Awrite(attr, H5T_STD_REF, &ref) < 0) {
ret_val = EXIT_FAILURE;
goto fail_awrite;
}
fail_awrite:
H5Aclose(attr);
fail_attr:
H5Sclose(aspace);
fail_aspace:
H5Rdestroy(&ref);
fail_sel:
H5Dclose(dset);
fail_dset:
H5Sclose(fspace);
fail_fspace:
H5Fclose(file);
fail_file:;
}
//! <!-- [create] -->
//! <!-- [read] -->
{
__label__ fail_file, fail_attr, fail_aread;
hid_t file, attr;
H5R_ref_t ref;
if ((file = H5Fopen("reference.h5", H5F_ACC_RDONLY, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_file;
}
// read the dataset region reference from the attribute
if ((attr = H5Aopen(file, "region", H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_attr;
}
if (H5Aread(attr, H5T_STD_REF, &ref) < 0) {
ret_val = EXIT_FAILURE;
goto fail_aread;
}
assert(H5Rget_type(&ref) == H5R_DATASET_REGION2);
// get an HDF5 path name for the dataset of the region reference
{
char buf[255];
if (H5Rget_obj_name(&ref, H5P_DEFAULT, buf, 255) < 0) {
ret_val = EXIT_FAILURE;
}
printf("Object name: \"%s\"\n", buf);
}
H5Rdestroy(&ref);
fail_aread:
H5Aclose(attr);
fail_attr:
H5Fclose(file);
fail_file:;
}
//! <!-- [read] -->
//! <!-- [update] -->
{
__label__ fail_file, fail_attr, fail_ref;
hid_t file, attr;
H5R_ref_t ref;
if ((file = H5Fopen("reference.h5", H5F_ACC_RDWR, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_file;
}
// H5T_STD_REF is a generic reference type
// we can "update" the attribute value to refer to the attribute itself
if ((attr = H5Aopen(file, "region", H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_attr;
}
if (H5Rcreate_attr(file, "data", "region", H5P_DEFAULT, &ref) < 0) {
ret_val = EXIT_FAILURE;
goto fail_ref;
}
assert(H5Rget_type(&ref) == H5R_ATTR);
if (H5Awrite(attr, H5T_STD_REF, &ref) < 0) {
ret_val = EXIT_FAILURE;
}
H5Rdestroy(&ref);
fail_ref:
H5Aclose(attr);
fail_attr:
H5Fclose(file);
fail_file:;
}
//! <!-- [update] -->
//! <!-- [delete] -->
{
__label__ fail_file, fail_ref;
hid_t file;
H5R_ref_t ref;
// create an HDF5 object reference to the root group
if ((file = H5Fopen("reference.h5", H5F_ACC_RDONLY, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_file;
}
if (H5Rcreate_object(file, ".", H5P_DEFAULT, &ref) < 0) {
ret_val = EXIT_FAILURE;
goto fail_ref;
}
// H5Rdestroy() releases all resources associated with an HDF5 reference
H5Rdestroy(&ref);
fail_ref:
H5Fclose(file);
fail_file:;
}
//! <!-- [delete] -->
return ret_val;
}
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