diff options
Diffstat (limited to 'HDF5Examples/FORTRAN/H5D/h5ex_d_chunk.F90')
| -rw-r--r-- | HDF5Examples/FORTRAN/H5D/h5ex_d_chunk.F90 | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/HDF5Examples/FORTRAN/H5D/h5ex_d_chunk.F90 b/HDF5Examples/FORTRAN/H5D/h5ex_d_chunk.F90 new file mode 100644 index 0000000..52669d6 --- /dev/null +++ b/HDF5Examples/FORTRAN/H5D/h5ex_d_chunk.F90 @@ -0,0 +1,182 @@ +! ************************************************************ +! +! This example shows how to create a chunked dataset. The +! program first writes integers in a hyperslab selection to +! a chunked dataset with dataspace dimensions of DIM0xDIM1 +! and chunk size of CHUNK0xCHUNK1, then closes the file. +! Next, it reopens the file, reads back the data, and +! outputs it to the screen. Finally it reads the data again +! using a different hyperslab selection, and outputs +! the result to the screen. +! +! This file is intended for use with HDF5 Library version 1.8 +! +! ************************************************************ + +! An optional example for determining the correct HDF5 version +! for picking the correct HDF5 API parameters. This is not +! part of the HDF5 library. +#include "h5_version.h" + +PROGRAM main + + USE HDF5 + + IMPLICIT NONE + + CHARACTER(LEN=18), PARAMETER :: filename = "h5ex_d_chunk.h5" + CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" + INTEGER , PARAMETER :: dim0 = 6 + INTEGER , PARAMETER :: dim1 = 8 + INTEGER , PARAMETER :: chunk0 = 4 + INTEGER , PARAMETER :: chunk1 = 4 + + INTEGER :: hdferr + INTEGER :: layout + INTEGER(HID_T) :: file, space, dset, dcpl ! Handles + INTEGER(HSIZE_T), DIMENSION(1:2) :: dims = (/dim0, dim1/), chunk = (/chunk0,chunk1/) + INTEGER(HSIZE_T), DIMENSION(1:2) :: start, stride, count, block + + INTEGER, DIMENSION(1:dim0, 1:dim1) :: wdata, & ! Write buffer + rdata ! Read buffer + INTEGER :: i, j + ! + ! Initialize FORTRAN interface. + ! + CALL h5open_f(hdferr) + ! Initialize data to "1", to make it easier to see the selections. + ! + wdata = 1 + ! + ! Print the data to the screen. + ! + WRITE(*, '(/,"Original Data:")') + DO i=1, dim0 + WRITE(*,'(" [")', ADVANCE='NO') + WRITE(*,'(80i3)', ADVANCE='NO') wdata(i,:) + WRITE(*,'(" ]")') + ENDDO + ! + ! Create a new file using the default properties. + ! + CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr) + ! + ! Create dataspace. Setting maximum size to be the current size. + ! + CALL h5screate_simple_f(2, dims, space, hdferr) + ! + ! Create the dataset creation property list, and set the chunk + ! size. + ! + CALL h5pcreate_f(H5P_DATASET_CREATE_F, dcpl, hdferr) + CALL h5pset_chunk_f(dcpl, 2, chunk, hdferr) + ! + ! Create the chunked dataset. + ! + CALL h5dcreate_f(file, dataset, H5T_STD_I32LE, space, dset, hdferr, dcpl) + ! + ! Define and select the first part of the hyperslab selection. + ! + start = 0 + stride = 3 + count(1:2) = (/2,3/) + block = 2 + CALL h5sselect_hyperslab_f (space, H5S_SELECT_SET_F, start, count, & + hdferr, stride, block) + ! + ! Define and select the second part of the hyperslab selection, + ! which is subtracted from the first selection by the use of + ! H5S_SELECT_NOTB + ! + block = 1 + CALL h5sselect_hyperslab_f (space, H5S_SELECT_NOTB_F, start, count, & + hdferr, stride, block) + ! + ! Write the data to the dataset. + ! + CALL h5dwrite_f(dset, H5T_NATIVE_INTEGER, wdata, dims, hdferr, file_space_id=space) + ! + ! Close and release resources. + ! + CALL h5pclose_f(dcpl , hdferr) + CALL h5dclose_f(dset , hdferr) + CALL h5sclose_f(space, hdferr) + CALL h5fclose_f(file , hdferr) + ! + ! Now we begin the read section of this example. + ! + ! + ! Open file and dataset using the default properties. + ! + CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr) + CALL h5dopen_f (file, dataset, dset, hdferr) + ! + ! Retrieve the dataset creation property list, and print the + ! storage layout. + ! + CALL h5dget_create_plist_f(dset, dcpl, hdferr) + CALL h5pget_layout_f(dcpl, layout, hdferr) + WRITE(*,'(/,"Storage layout for ", A," is: ")', ADVANCE='NO') dataset + IF(layout.EQ.H5D_COMPACT_F)THEN + WRITE(*,'("H5D_COMPACT_F",/)') + ELSE IF (layout.EQ.H5D_CONTIGUOUS_F)THEN + WRITE(*,'("H5D_CONTIGUOUS_F",/)') + ELSE IF (layout.EQ.H5D_CHUNKED_F)THEN + WRITE(*,'("H5D_CHUNKED_F",/)') +#if H5_VERSION_GE(1,12,0) + ELSE IF (layout.EQ.H5D_VIRTUAL_F)THEN + WRITE(*,'("H5D_VIRTUAL_F",/)') +#endif + ELSE + WRITE(*,'("Layout Error",/)') + ENDIF + ! + ! Read the data using the default properties. + ! + CALL h5dread_f(dset, H5T_NATIVE_INTEGER, rdata, dims, hdferr) + ! + ! Output the data to the screen. + ! + WRITE(*, '("Data as written to disk by hyberslabs:")') + DO i=1, dim0 + WRITE(*,'(" [")', ADVANCE='NO') + WRITE(*,'(80i3)', ADVANCE='NO') rdata(i,:) + WRITE(*,'(" ]")') + ENDDO + ! + ! Initialize the read array. + ! + rdata = 0 + ! + ! Define and select the hyperslab to use for reading. + ! + CALL h5dget_space_f(dset, space, hdferr) + start(1:2) = (/0,1/) + stride = 4 + count = 2 + block(1:2) = (/2,3/) + + CALL h5sselect_hyperslab_f (space, H5S_SELECT_SET_F, start, count, & + hdferr, stride, block) + ! + ! Read the data using the previously defined hyperslab. + ! + CALL h5dread_f(dset, H5T_NATIVE_INTEGER, rdata, dims, hdferr, file_space_id=space) + ! + ! Output the data to the screen. + ! + WRITE(*, '(/,"Data as read from disk by hyperslab:")') + DO i=1, dim0 + WRITE(*,'(" [")', ADVANCE='NO') + WRITE(*,'(80i3)', ADVANCE='NO') rdata(i,:) + WRITE(*,'(" ]")') + ENDDO + ! + ! Close and release resources. + ! + CALL h5pclose_f(dcpl , hdferr) + CALL h5dclose_f(dset , hdferr) + CALL h5sclose_f(space, hdferr) + CALL h5fclose_f(file , hdferr) + +END PROGRAM main |