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/**************************************************************
*
* This example shows how to work with extendible datasets.
* In the current version of the library a dataset MUST be
* chunked in order to be extendible.
*
* This example is derived from the h5_extend_write.c and
* h5_read_chunk.c examples that are in the "Introduction
* to HDF5".
*
*************************************************************/
#include "hdf5.h"
#define FILE "ext.h5"
#define DATASETNAME "ExtendibleArray"
#define RANK 2
int
main (void)
{
hid_t file; /* handles */
hid_t dataspace, dataset;
hid_t filespace;
hid_t cparms;
hid_t memspace;
hsize_t dims[2] = { 3, 3}; /* dataset dimensions
at creation time */
hsize_t dims1[2] = { 3, 3}; /* data1 dimensions */
hsize_t dims2[2] = { 7, 1}; /* data2 dimensions */
hsize_t maxdims[2] = {H5S_UNLIMITED, H5S_UNLIMITED};
hsize_t size[2];
hssize_t offset[2];
hsize_t i,j;
herr_t status, status_n;
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};
/* Variables used in reading data back */
hsize_t chunk_dims[2] ={2, 5};
hsize_t chunk_dimsr[2];
hsize_t dimsr[2];
int data_out[10][3];
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 (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 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);
/* Close resources */
status = H5Dclose (dataset);
status = H5Sclose (dataspace);
status = H5Sclose (filespace);
status = H5Fclose (file);
/****************************************************************
Read the data back
***************************************************************/
file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
dataset = H5Dopen (file, DATASETNAME);
filespace = H5Dget_space (dataset);
rank = H5Sget_simple_extent_ndims (filespace);
status_n = H5Sget_simple_extent_dims (filespace, dimsr, NULL);
cparms = H5Dget_create_plist (dataset);
if (H5D_CHUNKED == H5Pget_layout (cparms))
{
rank_chunk = H5Pget_chunk (cparms, 2, chunk_dimsr);
}
memspace = H5Screate_simple (rank,dimsr,NULL);
status = H5Dread (dataset, H5T_NATIVE_INT, memspace, filespace,
H5P_DEFAULT, data_out);
printf("\n");
printf("Dataset: \n");
for (j = 0; j < dimsr[0]; j++)
{
for (i = 0; i < dimsr[1]; i++)
printf("%d ", data_out[j][i]);
printf("\n");
}
status = H5Pclose (cparms);
status = H5Dclose (dataset);
status = H5Sclose (filespace);
status = H5Sclose (memspace);
status = H5Fclose (file);
}
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