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/************************************************************
This example shows how to read and write data to a dataset
using a data transform expression. The program first
writes integers to a dataset using the transform
expression TRANSFORM, then closes the file. Next, it
reopens the file, reads back the data without a transform,
and outputs the data to the screen. Finally it reads the
data using the transform expression RTRANSFORM and outputs
the results to the screen.
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "h5ex_d_transform.h5"
#define DATASET "DS1"
#define DIM0 4
#define DIM1 7
#define TRANSFORM "x+1"
#define RTRANSFORM "x-1"
int
main(void)
{
hid_t file = H5I_INVALID_HID;
hid_t space = H5I_INVALID_HID;
hid_t dset = H5I_INVALID_HID;
hid_t dxpl = H5I_INVALID_HID;
/* Handles */
herr_t status;
hsize_t dims[2] = {DIM0, DIM1};
int wdata[DIM0][DIM1]; /* Write buffer */
int rdata[DIM0][DIM1]; /* Read buffer */
hsize_t i, j;
/*
* Initialize data.
*/
for (i = 0; i < DIM0; i++)
for (j = 0; j < DIM1; j++)
wdata[i][j] = i * j - j;
/*
* Output the data to the screen.
*/
printf("Original Data:\n");
for (i = 0; i < DIM0; i++) {
printf(" [");
for (j = 0; j < DIM1; j++)
printf(" %3d", wdata[i][j]);
printf("]\n");
}
/*
* Create a new file using the default properties.
*/
file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/*
* Create dataspace. Setting maximum size to NULL sets the maximum
* size to be the current size.
*/
space = H5Screate_simple(2, dims, NULL);
/*
* Create the dataset transfer property list and define the
* transform expression.
*/
dxpl = H5Pcreate(H5P_DATASET_XFER);
status = H5Pset_data_transform(dxpl, TRANSFORM);
/*
* Create the dataset using the default properties. Unfortunately
* we must save as a native type or the transform operation will
* fail.
*/
dset = H5Dcreate(file, DATASET, H5T_NATIVE_INT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
/*
* Write the data to the dataset using the dataset transfer
* property list.
*/
status = H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, dxpl, wdata[0]);
/*
* Close and release resources.
*/
status = H5Pclose(dxpl);
status = H5Dclose(dset);
status = H5Sclose(space);
status = H5Fclose(file);
/*
* Now we begin the read section of this example.
*/
/*
* Open file and dataset using the default properties.
*/
file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
dset = H5Dopen(file, DATASET, H5P_DEFAULT);
/*
* 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("\nData as written with transform \"%s\":\n", TRANSFORM);
for (i = 0; i < DIM0; i++) {
printf(" [");
for (j = 0; j < DIM1; j++)
printf(" %3d", rdata[i][j]);
printf("]\n");
}
/*
* Create the dataset transfer property list and define the
* transform expression.
*/
dxpl = H5Pcreate(H5P_DATASET_XFER);
status = H5Pset_data_transform(dxpl, RTRANSFORM);
/*
* Read the data using the dataset transfer property list.
*/
status = H5Dread(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, dxpl, rdata[0]);
/*
* Output the data to the screen.
*/
printf("\nData as written with transform \"%s\" and read with transform \"%s\":\n", TRANSFORM,
RTRANSFORM);
for (i = 0; i < DIM0; i++) {
printf(" [");
for (j = 0; j < DIM1; j++)
printf(" %3d", rdata[i][j]);
printf("]\n");
}
/*
* Close and release resources.
*/
status = H5Pclose(dxpl);
status = H5Dclose(dset);
status = H5Fclose(file);
return 0;
}
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