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/* -*- c-file-style: "stroustrup" -*- */
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
//! <!-- [H5Dchunk_iter_cb] -->
int
chunk_cb(const hsize_t *offset, unsigned filter_mask, haddr_t addr, hsize_t size, void *op_data)
{
// only print the allocated chunk size only
printf("%" PRIuHSIZE "\n", size);
return EXIT_SUCCESS;
}
//! <!-- [H5Dchunk_iter_cb] -->
//! <!-- [H5Ovisit_cb] -->
herr_t
H5Ovisit_cb(hid_t obj, const char *name, const H5O_info2_t *info, void *op_data)
{
herr_t retval = 0;
char *base_path = (char *)op_data;
if (info->type == H5O_TYPE_DATASET) // current object is a dataset
{
hid_t dset, dcpl;
if ((dset = H5Dopen(obj, name, H5P_DEFAULT)) == H5I_INVALID_HID) {
retval = -1;
goto func_leave;
}
if ((dcpl = H5Dget_create_plist(dset)) == H5I_INVALID_HID) {
retval = -1;
goto fail_dcpl;
}
if (H5Pget_layout(dcpl) == H5D_CHUNKED) // dataset is chunked
{
__label__ fail_dtype, fail_dspace, fail_shape;
hid_t dspace, dtype;
size_t size, i;
int rank;
hsize_t cdims[H5S_MAX_RANK];
// get resources
if ((dtype = H5Dget_type(dset)) < 0) {
retval = -1;
goto fail_dtype;
}
if ((dspace = H5Dget_space(dset)) < 0) {
retval = -1;
goto fail_dspace;
}
// get the shape
if ((size = H5Tget_size(dtype)) == 0 || (rank = H5Sget_simple_extent_ndims(dspace)) < 0 ||
H5Pget_chunk(dcpl, H5S_MAX_RANK, cdims) < 0) {
retval = -1;
goto fail_shape;
}
// calculate the nominal chunk size
size = 1;
for (i = 0; i < (size_t)rank; ++i)
size *= cdims[i];
// print dataset info
printf("%s%s : nominal chunk size %lu [B] \n", base_path, name, size);
// get the allocated chunk sizes
if (H5Dchunk_iter(dset, H5P_DEFAULT, &chunk_cb, NULL) < 0) {
retval = -1;
goto fail_fig;
}
fail_fig:
fail_shape:
H5Sclose(dspace);
fail_dspace:
H5Tclose(dtype);
fail_dtype:;
}
H5Pclose(dcpl);
fail_dcpl:
H5Dclose(dset);
}
func_leave:
return retval;
}
//! <!-- [H5Ovisit_cb] -->
int
main(void)
{
int ret_val = EXIT_SUCCESS;
//! <!-- [create] -->
{
__label__ fail_lcpl, fail_dset, fail_file;
hid_t file, lcpl, fspace, dset;
unsigned mode = H5F_ACC_TRUNC;
char file_name[] = "d1.h5";
// link names can be arbitrary Unicode strings
char dset_name[] = "σύνολο/δεδομένων";
if ((file = H5Fcreate(file_name, mode, H5P_DEFAULT, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_file;
}
if ((lcpl = H5Pcreate(H5P_LINK_CREATE)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_lcpl;
}
// use UTF-8 encoding for link names
if (H5Pset_char_encoding(lcpl, H5T_CSET_UTF8) < 0) {
ret_val = EXIT_FAILURE;
goto fail_fspace;
}
// create intermediate groups as needed
if (H5Pset_create_intermediate_group(lcpl, 1) < 0) {
ret_val = EXIT_FAILURE;
goto fail_fspace;
}
// create a 1D dataspace
if ((fspace = H5Screate_simple(1, (hsize_t[]){10}, NULL)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_fspace;
}
// create a 32-bit integer dataset
if ((dset = H5Dcreate2(file, dset_name, H5T_STD_I32LE, fspace, lcpl, H5P_DEFAULT, H5P_DEFAULT)) ==
H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_dset;
}
H5Dclose(dset);
fail_dset:
H5Sclose(fspace);
fail_fspace:
H5Pclose(lcpl);
fail_lcpl:
H5Fclose(file);
fail_file:;
}
//! <!-- [create] -->
//! <!-- [read] -->
{
__label__ fail_dset, fail_file;
hid_t file, dset;
unsigned mode = H5F_ACC_RDONLY;
char file_name[] = "d1.h5";
// assume a priori knowledge of dataset name and size
char dset_name[] = "σύνολο/δεδομένων";
int elts[10];
if ((file = H5Fopen(file_name, mode, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_file;
}
if ((dset = H5Dopen2(file, dset_name, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_dset;
}
// read all dataset elements
if (H5Dread(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, elts) < 0)
ret_val = EXIT_FAILURE;
// do something w/ the dataset elements
H5Dclose(dset);
fail_dset:
H5Fclose(file);
fail_file:;
}
//! <!-- [read] -->
//! <!-- [update] -->
{
__label__ fail_update, fail_fspace, fail_dset, fail_file;
hid_t file, dset, fspace;
unsigned mode = H5F_ACC_RDWR;
char file_name[] = "d1.h5";
char dset_name[] = "σύνολο/δεδομένων";
int new_elts[6][2] = {{-1, 1}, {-2, 2}, {-3, 3}, {-4, 4}, {-5, 5}, {-6, 6}};
if ((file = H5Fopen(file_name, mode, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_file;
}
if ((dset = H5Dopen2(file, dset_name, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_dset;
}
// get the dataset's dataspace
if ((fspace = H5Dget_space(dset)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_fspace;
}
// select the first 5 elements in odd positions
if (H5Sselect_hyperslab(fspace, H5S_SELECT_SET, (hsize_t[]){1}, (hsize_t[]){2}, (hsize_t[]){5},
NULL) < 0) {
ret_val = EXIT_FAILURE;
goto fail_update;
}
// (implicitly) select and write the first 5 elements of the second column of NEW_ELTS
if (H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, fspace, H5P_DEFAULT, new_elts) < 0)
ret_val = EXIT_FAILURE;
fail_update:
H5Sclose(fspace);
fail_fspace:
H5Dclose(dset);
fail_dset:
H5Fclose(file);
fail_file:;
}
//! <!-- [update] -->
//! <!-- [delete] -->
{
__label__ fail_delete, fail_file;
hid_t file;
unsigned mode = H5F_ACC_RDWR;
char file_name[] = "d1.h5";
char group_name[] = "σύνολο";
char dset_name[] = "σύνολο/δεδομένων";
if ((file = H5Fopen(file_name, mode, H5P_DEFAULT)) == H5I_INVALID_HID) {
ret_val = EXIT_FAILURE;
goto fail_file;
}
// delete (unlink) the dataset
if (H5Ldelete(file, dset_name, H5P_DEFAULT) < 0) {
ret_val = EXIT_FAILURE;
goto fail_delete;
}
// the previous call deletes (unlinks) only the dataset
if (H5Ldelete(file, group_name, H5P_DEFAULT) < 0) {
ret_val = EXIT_FAILURE;
goto fail_delete;
}
fail_delete:
H5Fclose(file);
fail_file:;
}
//! <!-- [delete] -->
return ret_val;
}
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