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/*
* This example shows how to work with extendible dataset.
* In the current version of the library dataset MUST be
* chunked.
*
*/
#include "hdf5.h"
#define FILE "SDSextendible.h5"
#define DATASETNAME "ExtendibleArray"
#define RANK 2
#define NX 10
#define NY 5
int
main (void)
{
hid_t file; /* handles */
hid_t dataspace, dataset;
hid_t filespace;
hid_t cparms;
hsize_t dims[2] = { 3, 3}; /*
* dataset dimensions
* at the creation time
*/
hsize_t dims1[2] = { 3, 3}; /* data1 dimensions */
hsize_t dims2[2] = { 7, 1}; /* data2 dimensions */
hsize_t dims3[2] = { 2, 2}; /* data3 dimensions */
hsize_t maxdims[2] = {H5S_UNLIMITED, H5S_UNLIMITED};
hsize_t chunk_dims[2] ={2, 5};
hsize_t size[2];
hssize_t offset[2];
herr_t status;
int data1[3][3] = { {1, 1, 1}, /* data to write */
{1, 1, 1},
{1, 1, 1} };
int data2[7] = { 2, 2, 2, 2, 2, 2, 2};
int data3[2][2] = { {3, 3},
{3, 3} };
/*
* 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(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/*
* Modify dataset creation properties, i.e. enable chunking.
*/
cparms = H5Pcreate (H5P_DATASET_CREATE);
status = H5Pset_chunk( cparms, RANK, chunk_dims);
/*
* Create a new dataset within the file using cparms
* creation properties.
*/
dataset = H5Dcreate(file, DATASETNAME, H5T_NATIVE_INT, dataspace,
cparms);
/*
* Extend the dataset. This call assures that dataset is at least 3 x 3.
*/
size[0] = 3;
size[1] = 3;
status = H5Dextend (dataset, size);
/*
* Select a hyperslab.
*/
filespace = H5Dget_space (dataset);
offset[0] = 0;
offset[1] = 0;
status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL,
dims1, NULL);
/*
* Write the data to the hyperslab.
*/
status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
H5P_DEFAULT, data1);
/*
* Extend the dataset. Dataset becomes 10 x 3.
*/
dims[0] = dims1[0] + dims2[0];
size[0] = dims[0];
size[1] = dims[1];
status = H5Dextend (dataset, size);
/*
* Select a hyperslab.
*/
filespace = H5Dget_space (dataset);
offset[0] = 3;
offset[1] = 0;
status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL,
dims2, NULL);
/*
* Define memory space
*/
dataspace = H5Screate_simple(RANK, dims2, NULL);
/*
* Write the data to the hyperslab.
*/
status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
H5P_DEFAULT, data2);
/*
* Extend the dataset. Dataset becomes 10 x 5.
*/
dims[1] = dims1[1] + dims3[1];
size[0] = dims[0];
size[1] = dims[1];
status = H5Dextend (dataset, size);
/*
* Select a hyperslab
*/
filespace = H5Dget_space (dataset);
offset[0] = 0;
offset[1] = 3;
status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL,
dims3, NULL);
/*
* Define memory space.
*/
dataspace = H5Screate_simple(RANK, dims3, NULL);
/*
* Write the data to the hyperslab.
*/
status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
H5P_DEFAULT, data3);
/*
* Resulting dataset
*
* 3 3 3 2 2
* 3 3 3 2 2
* 3 3 3 0 0
* 2 0 0 0 0
* 2 0 0 0 0
* 2 0 0 0 0
* 2 0 0 0 0
* 2 0 0 0 0
* 2 0 0 0 0
* 2 0 0 0 0
*/
/*
* Close/release resources.
*/
H5Dclose(dataset);
H5Sclose(dataspace);
H5Sclose(filespace);
H5Fclose(file);
return 0;
}
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