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/************************************************************
This example shows how to create and extend an unlimited
dataset. The program first writes integers to a dataset
with dataspace dimensions of DIM0xDIM1, then closes the
file. Next, it reopens the file, reads back the data,
outputs it to the screen, extends the dataset, and writes
new data to the entire extended dataset. Finally it
reopens the file again, reads back the data, and outputs it
to the screen.
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "h5ex_d_unlimmod.h5"
#define DATASET "DS1"
#define DIM0 4
#define DIM1 7
#define EDIM0 6
#define EDIM1 10
#define CHUNK0 4
#define CHUNK1 4
int
main(void)
{
hid_t file = H5I_INVALID_HID;
hid_t space = H5I_INVALID_HID;
hid_t dset = H5I_INVALID_HID;
hid_t dcpl = H5I_INVALID_HID;
herr_t status;
hsize_t dims[2] = {DIM0, DIM1};
hsize_t extdims[2] = {EDIM0, EDIM1};
hsize_t maxdims[2];
hsize_t chunk[2] = {CHUNK0, CHUNK1};
int wdata[DIM0][DIM1]; /* Write buffer */
int wdata2[EDIM0][EDIM1]; /* Write buffer for extension */
int **rdata = NULL; /* Read buffer */
int ndims;
hsize_t i, j;
/*
* Initialize data.
*/
for (i = 0; i < DIM0; i++)
for (j = 0; j < DIM1; j++)
wdata[i][j] = i * j - j;
/*
* Create a new file using the default properties.
*/
file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/*
* Create dataspace with unlimited dimensions.
*/
maxdims[0] = H5S_UNLIMITED;
maxdims[1] = H5S_UNLIMITED;
space = H5Screate_simple(2, dims, maxdims);
/*
* Create the dataset creation property list, and set the chunk
* size.
*/
dcpl = H5Pcreate(H5P_DATASET_CREATE);
status = H5Pset_chunk(dcpl, 2, chunk);
/*
* Create the unlimited dataset.
*/
dset = H5Dcreate(file, DATASET, H5T_STD_I32LE, space, H5P_DEFAULT, dcpl, H5P_DEFAULT);
/*
* Write the data to the dataset.
*/
status = H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata[0]);
/*
* Close and release resources.
*/
status = H5Pclose(dcpl);
status = H5Dclose(dset);
status = H5Sclose(space);
status = H5Fclose(file);
/*
* In this next section we read back the data, extend the dataset,
* and write new data to the entire dataset.
*/
/*
* Open file and dataset using the default properties.
*/
file = H5Fopen(FILE, H5F_ACC_RDWR, H5P_DEFAULT);
dset = H5Dopen(file, DATASET, H5P_DEFAULT);
/*
* Get dataspace and allocate memory for read buffer. This is a
* two dimensional dataset so the dynamic allocation must be done
* in steps.
*/
space = H5Dget_space(dset);
ndims = H5Sget_simple_extent_dims(space, dims, NULL);
/*
* Allocate array of pointers to rows.
*/
rdata = (int **)malloc(dims[0] * sizeof(int *));
/*
* Allocate space for integer data.
*/
rdata[0] = (int *)malloc(dims[0] * dims[1] * sizeof(int));
/*
* Set the rest of the pointers to rows to the correct addresses.
*/
for (i = 1; i < dims[0]; i++)
rdata[i] = rdata[0] + i * dims[1];
/*
* Read the data using the default properties.
*/
status = H5Dread(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata[0]);
/*
* Output the data to the screen.
*/
printf("Dataset before extension:\n");
for (i = 0; i < dims[0]; i++) {
printf(" [");
for (j = 0; j < dims[1]; j++)
printf(" %3d", rdata[i][j]);
printf("]\n");
}
/*
* Extend the dataset.
*/
status = H5Dset_extent(dset, extdims);
/*
* Initialize data for writing to the extended dataset.
*/
for (i = 0; i < EDIM0; i++)
for (j = 0; j < EDIM1; j++)
wdata2[i][j] = j;
/*
* Write the data to the extended dataset.
*/
status = H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata2[0]);
/*
* Close and release resources.
*/
free(rdata[0]);
free(rdata);
status = H5Dclose(dset);
status = H5Sclose(space);
status = H5Fclose(file);
/*
* Now we simply read back the data and output it to the screen.
*/
/*
* Open file and dataset using the default properties.
*/
file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
dset = H5Dopen(file, DATASET, H5P_DEFAULT);
/*
* Get dataspace and allocate memory for the read buffer as before.
*/
space = H5Dget_space(dset);
ndims = H5Sget_simple_extent_dims(space, dims, NULL);
rdata = (int **)malloc(dims[0] * sizeof(int *));
rdata[0] = (int *)malloc(dims[0] * dims[1] * sizeof(int));
for (i = 1; i < dims[0]; i++)
rdata[i] = rdata[0] + i * dims[1];
/*
* Read the data using the default properties.
*/
status = H5Dread(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata[0]);
/*
* Output the data to the screen.
*/
printf("\nDataset after extension:\n");
for (i = 0; i < dims[0]; i++) {
printf(" [");
for (j = 0; j < dims[1]; j++)
printf(" %3d", rdata[i][j]);
printf("]\n");
}
/*
* Close and release resources.
*/
free(rdata[0]);
free(rdata);
status = H5Dclose(dset);
status = H5Sclose(space);
status = H5Fclose(file);
return 0;
}
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