summaryrefslogtreecommitdiffstats
path: root/fortran/examples/compound.f90
blob: f5e91d6434fcaf6f4815c2b0b2ec12cf40544b00 (plain)
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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!   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://support.hdfgroup.org/ftp/HDF5/releases.  *
!   If you do not have access to either file, you may request a copy from     *
!   help@hdfgroup.org.                                                        *
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!
!
! This program creates a dataset that is one dimensional array of
! structures  {
!                 character*2
!                 integer
!                 double precision
!                 real
!                                   }
! Data is written and read back by fields.
!

     PROGRAM COMPOUNDEXAMPLE

     USE HDF5 ! This module contains all necessary modules

     IMPLICIT NONE

     CHARACTER(LEN=11), PARAMETER :: filename = "compound.h5" ! File name
     CHARACTER(LEN=8), PARAMETER :: dsetname = "Compound"     ! Dataset name
     INTEGER, PARAMETER :: dimsize = 6 ! Size of the dataset

     INTEGER(HID_T) :: file_id       ! File identifier
     INTEGER(HID_T) :: dset_id       ! Dataset identifier
     INTEGER(HID_T) :: dspace_id     ! Dataspace identifier
     INTEGER(HID_T) :: dtype_id      ! Compound datatype identifier
     INTEGER(HID_T) :: dt1_id      ! Memory datatype identifier (for character field)
     INTEGER(HID_T) :: dt2_id      ! Memory datatype identifier (for integer field)
     INTEGER(HID_T) :: dt3_id      ! Memory datatype identifier (for double precision field)
     INTEGER(HID_T) :: dt4_id      ! Memory datatype identifier (for real field)
     INTEGER(HID_T) :: dt5_id      ! Memory datatype identifier
     INTEGER(HID_T) :: plist_id    ! Dataset trasfer property
     INTEGER(SIZE_T) :: typesize


     INTEGER(HSIZE_T), DIMENSION(1) :: dims = (/dimsize/) ! Dataset dimensions
     INTEGER     ::   rank = 1                            ! Dataset rank

     INTEGER     ::   error ! Error flag
     INTEGER(SIZE_T)     ::   type_size  ! Size of the datatype
     INTEGER(SIZE_T)     ::   type_sizec  ! Size of the character datatype
     INTEGER(SIZE_T)     ::   type_sizei  ! Size of the integer datatype
     INTEGER(SIZE_T)     ::   type_sized  ! Size of the double precision datatype
     INTEGER(SIZE_T)     ::   type_sizer  ! Size of the real datatype
     INTEGER(SIZE_T)     ::   offset     ! Member's offset
     CHARACTER(LEN=2), DIMENSION(dimsize)      :: char_member
     CHARACTER(LEN=2), DIMENSION(dimsize)      :: char_member_out ! Buffer to read data out
     INTEGER, DIMENSION(dimsize)          :: int_member
     DOUBLE PRECISION, DIMENSION(dimsize) :: double_member
     REAL, DIMENSION(dimsize)             :: real_member
     INTEGER :: i
     INTEGER(HSIZE_T), DIMENSION(1) :: data_dims
     data_dims(1) = dimsize
     !
     ! Initialize data buffer.
     !
     do i = 1, dimsize
        char_member(i)(1:1) = char(65+i)
        char_member(i)(2:2) = char(65+i)
        char_member_out(i)(1:1)   = char(65)
        char_member_out(i)(2:2)   = char(65)
        int_member(i)   = i
        double_member(i)   = 2.* i
        real_member(i)   = 3. * i
     enddo

     !
     ! Initialize FORTRAN interface.
     !
     CALL h5open_f(error)
     !
     ! Set dataset transfer property to preserve partially initialized fields
     ! during write/read to/from dataset with compound datatype.
     !
     CALL h5pcreate_f(H5P_DATASET_XFER_F, plist_id, error)
     CALL h5pset_preserve_f(plist_id, .TRUE., error)

     !
     ! Create a new file using default properties.
     !
     CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file_id, error)

     !
     ! Create the dataspace.
     !
     CALL h5screate_simple_f(rank, dims, dspace_id, error)
     !
     ! Create compound datatype.
     !
     ! First calculate total size by calculating sizes of each member
     !
     CALL h5tcopy_f(H5T_NATIVE_CHARACTER, dt5_id, error)
     typesize = 2
     CALL h5tset_size_f(dt5_id, typesize, error)
     CALL h5tget_size_f(dt5_id, type_sizec, error)
     CALL h5tget_size_f(H5T_NATIVE_INTEGER, type_sizei, error)
     CALL h5tget_size_f(H5T_NATIVE_DOUBLE, type_sized, error)
     CALL h5tget_size_f(H5T_NATIVE_REAL, type_sizer, error)
     type_size = type_sizec + type_sizei + type_sized + type_sizer
     CALL h5tcreate_f(H5T_COMPOUND_F, type_size, dtype_id, error)
     !
     ! Insert memebers
     !
     ! CHARACTER*2 memeber
     !
     offset = 0
     CALL h5tinsert_f(dtype_id, "char_field", offset, dt5_id, error)
     !
     ! INTEGER member
     !
     offset = offset + type_sizec ! Offset of the second memeber is 2
     CALL h5tinsert_f(dtype_id, "integer_field", offset, H5T_NATIVE_INTEGER, error)
     !
     ! DOUBLE PRECISION member
     !
     offset = offset + type_sizei  ! Offset of the third memeber is 6
     CALL h5tinsert_f(dtype_id, "double_field", offset, H5T_NATIVE_DOUBLE, error)
     !
     ! REAL member
     !
     offset = offset + type_sized  ! Offset of the last member is 14
     CALL h5tinsert_f(dtype_id, "real_field", offset, H5T_NATIVE_REAL, error)

     !
     ! Create the dataset with compound datatype.
     !
     CALL h5dcreate_f(file_id, dsetname, dtype_id, dspace_id, &
                      dset_id, error)
     !
     ! Create memory types. We have to create a compound datatype
     ! for each member we want to write.
     !
     CALL h5tcreate_f(H5T_COMPOUND_F, type_sizec, dt1_id, error)
     offset = 0
     CALL h5tinsert_f(dt1_id, "char_field", offset, dt5_id, error)
     !
     CALL h5tcreate_f(H5T_COMPOUND_F, type_sizei, dt2_id, error)
     offset = 0
     CALL h5tinsert_f(dt2_id, "integer_field", offset, H5T_NATIVE_INTEGER, error)
     !
     CALL h5tcreate_f(H5T_COMPOUND_F, type_sized, dt3_id, error)
     offset = 0
     CALL h5tinsert_f(dt3_id, "double_field", offset, H5T_NATIVE_DOUBLE, error)
     !
     CALL h5tcreate_f(H5T_COMPOUND_F, type_sizer, dt4_id, error)
     offset = 0
     CALL h5tinsert_f(dt4_id, "real_field", offset, H5T_NATIVE_REAL, error)
     !
     ! Write data by fields in the datatype. Fields order is not important.
     !
     CALL h5dwrite_f(dset_id, dt4_id, real_member, data_dims, error, xfer_prp = plist_id)
     CALL h5dwrite_f(dset_id, dt1_id, char_member, data_dims, error, xfer_prp = plist_id)
     CALL h5dwrite_f(dset_id, dt3_id, double_member, data_dims, error, xfer_prp = plist_id)
     CALL h5dwrite_f(dset_id, dt2_id, int_member, data_dims, error, xfer_prp = plist_id)

     !
     ! End access to the dataset and release resources used by it.
     !
     CALL h5dclose_f(dset_id, error)

     !
     ! Terminate access to the data space.
     !
     CALL h5sclose_f(dspace_id, error)
     !
     ! Terminate access to the datatype
     !
     CALL h5tclose_f(dtype_id, error)
     CALL h5tclose_f(dt1_id, error)
     CALL h5tclose_f(dt2_id, error)
     CALL h5tclose_f(dt3_id, error)
     CALL h5tclose_f(dt4_id, error)
     CALL h5tclose_f(dt5_id, error)

     !
     ! Close the file.
     !
     CALL h5fclose_f(file_id, error)

     !
     ! Open the file.
     !
     CALL h5fopen_f (filename, H5F_ACC_RDWR_F, file_id, error)
     !
     ! Open the dataset.
     !
     CALL h5dopen_f(file_id, dsetname, dset_id, error)
     !
     ! Create memeory datatyoe to read character member of the compound datatype.
     !
     CALL h5tcopy_f(H5T_NATIVE_CHARACTER, dt2_id, error)
     typesize = 2
     CALL h5tset_size_f(dt2_id, typesize, error)
     CALL h5tget_size_f(dt2_id, type_size, error)
     CALL h5tcreate_f(H5T_COMPOUND_F, type_size, dt1_id, error)
     offset = 0
     CALL h5tinsert_f(dt1_id, "char_field", offset, dt2_id, error)
     !
     ! Read part of the datatset and display it.
     !
     CALL h5dread_f(dset_id, dt1_id, char_member_out, data_dims, error)
     write(*,*) (char_member_out(i), i=1, dimsize)

     !
     ! Close all open objects.
     !
     CALL h5dclose_f(dset_id, error)
     CALL h5tclose_f(dt1_id, error)
     CALL h5tclose_f(dt2_id, error)
     CALL h5fclose_f(file_id, error)
     !
     ! Close FORTRAN interface.
     !
     CALL h5close_f(error)

     END PROGRAM COMPOUNDEXAMPLE