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+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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 files COPYING and Copyright.html. COPYING can be found at the root *
+ * of the source code distribution tree; Copyright.html can be found at the *
+ * root level of an installed copy of the electronic HDF5 document set and *
+ * is linked from the top-level documents page. It can also be found at *
+ * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
+ * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * 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
+
+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}
+ };
+
+#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 = H5Dcreate(file, "data_no_trans", H5T_NATIVE_FLOAT, dataspace, 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);
+ H5Pget_data_transform(dxpl_id_f_to_c, transform, transform_size);
+
+ 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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