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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* 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 files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* This example how to work with extendible datasets. The dataset
* must be chunked in order to be extendible.
*
* It is used in the HDF5 Tutorial.
*/
#include "hdf5.h"
#define FILENAME "extend.h5"
#define DATASETNAME "ExtendibleArray"
#define RANK 2
int
main (void)
{
hid_t file; /* handles */
hid_t dataspace, dataset;
hid_t filespace, memspace;
hid_t prop;
hsize_t dims[2] = {3, 3}; /* dataset dimensions at creation time */
hsize_t maxdims[2] = {H5S_UNLIMITED, H5S_UNLIMITED};
herr_t status;
hsize_t chunk_dims[2] = {2, 5};
int data[3][3] = { {1, 1, 1}, /* data to write */
{1, 1, 1},
{1, 1, 1} };
/* Variables used in extending and writing to the extended portion of dataset */
hsize_t size[2];
hsize_t offset[2];
hsize_t dimsext[2] = {7, 3}; /* extend dimensions */
int dataext[7][3] = { {2, 3, 4},
{2, 3, 4},
{2, 3, 4},
{2, 3, 4},
{2, 3, 4},
{2, 3, 4},
{2, 3, 4} };
/* Variables used in reading data back */
hsize_t chunk_dimsr[2];
hsize_t dimsr[2];
hsize_t i, j;
int rdata[10][3];
herr_t status_n;
int rank, rank_chunk;
/* Create the data space with unlimited dimensions. */
dataspace = H5Screate_simple (RANK, dims, maxdims);
/* Create a new file. If file exists its contents will be overwritten. */
file = H5Fcreate (FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Modify dataset creation properties, i.e. enable chunking */
prop = H5Pcreate (H5P_DATASET_CREATE);
status = H5Pset_chunk (prop, RANK, chunk_dims);
/* Create a new dataset within the file using chunk
creation properties. */
dataset = H5Dcreate2 (file, DATASETNAME, H5T_NATIVE_INT, dataspace,
H5P_DEFAULT, prop, H5P_DEFAULT);
/* Write data to dataset */
status = H5Dwrite (dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL,
H5P_DEFAULT, data);
/* Extend the dataset. Dataset becomes 10 x 3 */
size[0] = dims[0]+ dimsext[0];
size[1] = dims[1];
status = H5Dset_extent (dataset, size);
/* Select a hyperslab in extended portion of dataset */
filespace = H5Dget_space (dataset);
offset[0] = 3;
offset[1] = 0;
status = H5Sselect_hyperslab (filespace, H5S_SELECT_SET, offset, NULL,
dimsext, NULL);
/* Define memory space */
memspace = H5Screate_simple (RANK, dimsext, NULL);
/* Write the data to the extended portion of dataset */
status = H5Dwrite (dataset, H5T_NATIVE_INT, memspace, filespace,
H5P_DEFAULT, dataext);
/* Close resources */
status = H5Dclose (dataset);
status = H5Pclose (prop);
status = H5Sclose (dataspace);
status = H5Sclose (memspace);
status = H5Sclose (filespace);
status = H5Fclose (file);
/********************************************
* Re-open the file and read the data back. *
********************************************/
file = H5Fopen (FILENAME, H5F_ACC_RDONLY, H5P_DEFAULT);
dataset = H5Dopen2 (file, DATASETNAME, H5P_DEFAULT);
filespace = H5Dget_space (dataset);
rank = H5Sget_simple_extent_ndims (filespace);
status_n = H5Sget_simple_extent_dims (filespace, dimsr, NULL);
prop = H5Dget_create_plist (dataset);
if (H5D_CHUNKED == H5Pget_layout (prop))
rank_chunk = H5Pget_chunk (prop, rank, chunk_dimsr);
memspace = H5Screate_simple (rank, dimsr, NULL);
status = H5Dread (dataset, H5T_NATIVE_INT, memspace, filespace,
H5P_DEFAULT, rdata);
printf("\n");
printf("Dataset: \n");
for (j = 0; j < dimsr[0]; j++)
{
for (i = 0; i < dimsr[1]; i++)
printf("%d ", rdata[j][i]);
printf("\n");
}
status = H5Pclose (prop);
status = H5Dclose (dataset);
status = H5Sclose (filespace);
status = H5Sclose (memspace);
status = H5Fclose (file);
}
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