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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 COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* This example demonstrates how the data transform features of
* HDF5 works.
*
* (1)
* The test first writes out data, with no data transform set.
* Then, the test reads back this data with a data transform applied.
*
* (2)
* Then, the test writes a new set of data, with a data transform set.
* Then, the test reads this new set of data, without a data set.
*
* (3)
* Lastly, the test reads the previous set of data (that was written out
* with a data transform) with a data transform set for the read.
*
* (4)
* Get the transform from the property using H5Pget_data_transform.
*/
#include "hdf5.h"
#define ROWS 12
#define COLS 18
/* clang-format off */
const float windchillF[ROWS][COLS] =
{ {36.0, 31.0, 25.0, 19.0, 13.0, 7.0, 1.0, -5.0, -11.0, -16.0, -22.0, -28.0, -34.0, -40.0, -46.0, -52.0, -57.0, -63.0},
{34.0, 27.0, 21.0, 15.0, 9.0, 3.0, -4.0, -10.0, -16.0, -22.0, -28.0, -35.0, -41.0, -47.0, -53.0, -59.0, -66.0, -72.0},
{32.0, 25.0, 19.0, 13.0, 6.0, 0.0, -7.0, -13.0, -19.0, -26.0, -32.0, -39.0, -45.0, -51.0, -58.0, -64.0, -71.0, -77.0},
{30.0, 24.0, 17.0, 11.0, 4.0, -2.0, -9.0, -15.0, -22.0, -29.0, -35.0, -42.0, -48.0, -55.0, -61.0, -68.0, -74.0, -81.0},
{29.0, 23.0, 16.0, 9.0, 3.0, -4.0, -11.0, -17.0, -24.0, -31.0, -37.0, -44.0, -51.0, -58.0, -64.0, -71.0, -78.0, -84.0},
{28.0, 22.0, 15.0, 8.0, 1.0, -5.0, -12.0, -19.0, -26.0, -33.0, -39.0, -46.0, -53.0, -60.0, -67.0, -73.0, -80.0, -87.0},
{28.0, 21.0, 14.0, 7.0, 0.0, -7.0, -14.0, -21.0, -27.0, -34.0, -41.0, -48.0, -55.0, -62.0, -69.0, -76.0, -82.0, -89.0},
{27.0, 20.0, 13.0, 6.0, -1.0, -8.0, -15.0, -22.0, -29.0, -36.0, -43.0, -50.0, -57.0, -64.0, -71.0, -78.0, -84.0, -91.0},
{26.0, 19.0, 12.0, 5.0, -2.0, -9.0, -16.0, -23.0, -30.0, -37.0, -44.0, -51.0, -58.0, -65.0, -72.0, -79.0, -86.0, -93.0},
{26.0, 19.0, 12.0, 4.0, -3.0, -10.0, -17.0, -24.0, -31.0, -38.0, -45.0, -52.0, -60.0, -67.0, -74.0, -81.0, -88.0, -95.0},
{25.0, 18.0, 11.0, 4.0, -3.0, -11.0, -18.0, -25.0, -32.0, -39.0, -46.0, -54.0, -61.0, -68.0, -75.0, -82.0, -89.0, -97.0},
{25.0, 17.0, 10.0, 3.0, -4.0, -11.0, -19.0, -26.0, -33.0, -40.0, -48.0, -55.0, -62.0, -69.0, -76.0, -84.0, -91.0, -98.0}
};
/* clang-format on */
#define PRINT(array) \
{ \
for (i = 0; i < ROWS; i++) { \
for (j = 0; j < COLS; j++) \
printf("%6.2f ", array[i][j]); \
printf("\n"); \
} \
}
int
main(void)
{
hid_t file, dataset; /* file and dataset handles */
hid_t dataspace; /* handles */
hsize_t dimsf[2]; /* dataset dimensions */
herr_t status;
hid_t dxpl_id_f_to_c, dxpl_id_c_to_f; /* data transform handles */
const char *f_to_c = "(5/9.0)*(x-32)";
const char *c_to_f = "(9/5.0)*x + 32";
char * transform;
float windchillC[ROWS][COLS];
int i, j, transform_size;
/*
* Create a new file using H5F_ACC_TRUNC access,
* default file creation properties, and default file
* access properties.
*/
file = H5Fcreate("dtransform.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/*
* Describe the size of the array and create the data space for fixed
* size dataset.
*/
dimsf[0] = ROWS;
dimsf[1] = COLS;
dataspace = H5Screate_simple(2, dimsf, NULL);
/*
* Create a new dataset within the file using defined dataspace and
* datatype and default dataset creation properties.
*/
dataset =
H5Dcreate2(file, "data_no_trans", H5T_NATIVE_FLOAT, dataspace, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
printf("\nOriginal Data: \n");
PRINT(windchillF);
/**************** PART 1 **************/
/*
* Write the data to the dataset using default transfer properties (ie, no transform set)
*/
status = H5Dwrite(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, windchillF);
/* Create the dataset transfer property list */
dxpl_id_f_to_c = H5Pcreate(H5P_DATASET_XFER);
/* Set the data transform */
H5Pset_data_transform(dxpl_id_f_to_c, f_to_c);
/* Read out the data with the data transform */
H5Dread(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, dxpl_id_f_to_c, windchillC);
/* Print the data from the read*/
printf("\nData with no write transform, but a read transform: \n");
PRINT(windchillC);
/**************** PART 2 **************/
/*
* Write the data to the dataset with the f_to_c transform set
*/
status = H5Dwrite(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, dxpl_id_f_to_c, windchillF);
/* Read out the data with the default transfer list (ie, no transform set) */
H5Dread(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, windchillC);
/* Print the data from the read*/
printf("\nData with write transform, but no read transform: \n");
PRINT(windchillC);
/************** PART 3 ***************/
/* Create the dataset transfer property list */
dxpl_id_c_to_f = H5Pcreate(H5P_DATASET_XFER);
/* Set the data transform to be used on the read*/
H5Pset_data_transform(dxpl_id_c_to_f, c_to_f);
/*
* Write the data to the dataset using the f_to_c transform
*/
status = H5Dwrite(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, dxpl_id_f_to_c, windchillF);
/* Read the data with the c_to_f data transform */
H5Dread(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, dxpl_id_c_to_f, windchillC);
/* Print the data from the read*/
printf("\nData with both read and write data transform: \n");
PRINT(windchillC);
/************** PART 4 **************/
transform_size = H5Pget_data_transform(dxpl_id_f_to_c, NULL, 0);
transform = (char *)malloc(transform_size + 1);
H5Pget_data_transform(dxpl_id_f_to_c, transform, transform_size + 1);
printf("\nTransform string (from dxpl_id_f_to_c) is: %s\n", transform);
/*
* Close/release resources.
*/
H5Pclose(dxpl_id_c_to_f);
H5Pclose(dxpl_id_f_to_c);
H5Sclose(dataspace);
H5Dclose(dataset);
H5Fclose(file);
return 0;
}
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