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!
!This example shows how to work with extendible datasets.
!It creates a 3 x 3 extendible dataset, write to that dataset,
!extend the dataset to 10x3, and write to the dataset again
!
PROGRAM CHUNKEXAMPLE
USE HDF5 ! This module contains all necessary modules
IMPLICIT NONE
!
!the dataset is stored in file "extf.h5"
!
CHARACTER(LEN=7), PARAMETER :: filename = "extf.h5"
!
!dataset name is "ExtendibleArray"
!
CHARACTER(LEN=15), PARAMETER :: dsetname = "ExtendibleArray"
!
!dataset rank is 2
!
INTEGER :: RANK = 2
INTEGER(HID_T) :: file_id ! File identifier
INTEGER(HID_T) :: dset_id ! Dataset identifier
INTEGER(HID_T) :: dataspace ! Dataspace identifier
INTEGER(HID_T) :: filespace ! Dataspace identifier
INTEGER(HID_T) :: memspace ! memspace identifier
INTEGER(HID_T) :: cparms !dataset creatation property identifier
!
!dataset dimensions at creation time
!
INTEGER(HSIZE_T), DIMENSION(2) :: dims = (/3,3/)
!
!data1 dimensions
!
INTEGER(HSIZE_T), DIMENSION(2) :: dims1 = (/3,3/)
!
!data2 dimensions
!
INTEGER(HSIZE_T), DIMENSION(2) :: dims2 = (/7,1/)
!
!Maximum dimensions
!
INTEGER(HSIZE_T), DIMENSION(2) :: maxdims
!
!data1 dimensions
!
INTEGER, DIMENSION(3,3) :: data1
!
!data2 dimensions
!
INTEGER, DIMENSION(7,1) :: data2
!
!Size of the hyperslab in the file
!
INTEGER(HSIZE_T), DIMENSION(2) :: size
!
!hyperslab offset in the file
!
INTEGER(HSIZE_T), DIMENSION(2) :: offset
!
!general purpose integer
!
INTEGER :: i, j, k
!
!flag to check operation success
!
INTEGER :: error, error_n
!
!Variables used in reading data back
!
INTEGER(HSIZE_T), DIMENSION(2) :: chunk_dims = (/5,2/)
INTEGER(HSIZE_T), DIMENSION(2) :: chunk_dimsr
INTEGER(HSIZE_T), DIMENSION(2) :: dimsr, maxdimsr
INTEGER, DIMENSION(10,3) :: data_out
INTEGER :: rankr, rank_chunk
!
!data initialization
!
do i = 1, 3
do j = 1, 3
data1(i,j) = 1
end do
end do
do j = 1, 7
data2(j,1) = 2
end do
!
!Initialize FORTRAN predifined datatypes
!
CALL h5close_f(error)
!
!Create a new file using default properties.
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file_id, error)
!
!Create the data space with unlimited dimensions.
!
maxdims = (/H5S_UNLIMITED_f, H5S_UNLIMITED_f/)
CALL h5screate_simple_f(RANK, dims, dataspace, error, maxdims)
!
!Modify dataset creation properties, i.e. enable chunking
!
CALL h5pcreate_f(H5P_DATASET_CREATE_F, cparms, error)
CALL h5pset_chunk_f(cparms, RANK, chunk_dims, error)
!
!Create a new dataset within the file using cparms creation properties.
!
!CALL h5dcreate_f(file_id, dsetname, H5T_NATIVE_INT_F, dataspace, &
CALL h5dcreate_f(file_id, dsetname, H5T_NATIVE_INTEGER, dataspace, &
dset_id, error, cparms)
!
!Extend the dataset. This call assures that dataset is 3 x 3.
!
size(1) = 3
size(2) = 3
CALL h5dextend_f(dset_id, size, error)
!
!Select a hyperslab.
!
CALL h5dget_space_f(dset_id, filespace, error)
offset(1) = 0;
offset(2) = 0;
CALL h5sselect_hyperslab_f(filespace, H5S_SELECT_SET_F, &
offset, dims1, error)
!
!Write the data to the hyperslab.
!
!CALL H5Dwrite_f(dset_id, H5T_NATIVE_INT_F, data1, error, &
CALL H5Dwrite_f(dset_id, H5T_NATIVE_INTEGER, data1, error, &
filespace, dataspace)
!
!Extend the dataset. Dataset becomes 10 x 3.
!
dims(1) = dims1(1) + dims2(1);
size(1) = dims(1);
size(2) = dims(2);
CALL h5dextend_f(dset_id, size, error)
!
!Select a hyperslab.
!
CALL h5dget_space_f(dset_id, filespace, error)
offset(1) = 3;
offset(2) = 0;
CALL h5sselect_hyperslab_f(filespace, H5S_SELECT_SET_F, &
offset, dims2, error)
!
!create memory dataspace.
!
CALL h5screate_simple_f(RANK, dims2, memspace, error)
!
!Write the data to the hyperslab.
!
!CALL H5Dwrite_f(dset_id, H5T_NATIVE_INT_F, data2, error, &
CALL H5Dwrite_f(dset_id, H5T_NATIVE_INTEGER, data2, error, &
mem_space_id=memspace, file_space_id=filespace)
!
!Close the dataspace for the dataset.
!
CALL h5sclose_f(dataspace, error)
CALL h5sclose_f(filespace, error)
!
!Close the memoryspace.
!
CALL h5sclose_f(memspace, error)
!
!Close the dataset.
!
CALL h5dclose_f(dset_id, error)
!
!Close the property list.
!
CALL h5pclose_f(cparms, error)
!
!Close the file.
!
CALL h5fclose_f(file_id, error)
!
!read the data back
!
!Open the file.
!
CALL h5fopen_f (filename, H5F_ACC_RDONLY_F, file_id, error)
!
!Open the dataset.
!
CALL h5dopen_f(file_id, dsetname, dset_id, error)
!
!Get dataset's dataspace handle.
!
CALL h5dget_space_f(dset_id, dataspace, error)
!
!Get dataspace's rank.
!
CALL h5sget_simple_extent_ndims_f(dataspace, rankr, error)
!
!Get dataspace's dimensinons.
!
CALL h5sget_simple_extent_dims_f(dataspace, dimsr, maxdimsr, error)
!
!Get creation property list.
!
CALL h5dget_create_plist_f(dset_id, cparms, error)
!
!Get chunk dimensions.
!
CALL h5pget_chunk_f(cparms, 2, chunk_dimsr, error)
!
!create memory dataspace.
!
CALL h5screate_simple_f(rankr, dimsr, memspace, error)
!
!Read data
!
!CALL H5Dread_f(dset_id, H5T_NATIVE_INT_F, data_out, error, &
CALL H5Dread_f(dset_id, H5T_NATIVE_INTEGER, data_out, error, &
memspace, dataspace)
!
!Print data
!
do i = 1, dimsr(1)
print *, (data_out(i,j), j = 1,dimsr(2))
end do
!
!Close the dataspace for the dataset.
!
CALL h5sclose_f(dataspace, error)
!
!Close the memoryspace.
!
CALL h5sclose_f(memspace, error)
!
!Close the dataset.
!
CALL h5dclose_f(dset_id, error)
!
!Close the file.
!
CALL h5fclose_f(file_id, error)
!
!Close the property list.
!
CALL h5pclose_f(cparms, error)
!
! Close FORTRAN predefined datatypes.
!
CALL h5close_f(error)
END PROGRAM CHUNKEXAMPLE
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