1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* 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;
}
|
