!
! Example of using the shuffling filter with zlib compression

     PROGRAM DSETSHUFFLE

     USE HDF5 ! This module contains all necessary modules 
        
     IMPLICIT NONE

     CHARACTER(LEN=9), PARAMETER :: filename = "dshuff.h5"
     CHARACTER(LEN=4), PARAMETER :: dsetname = "dset-shuf"

     INTEGER(HID_T) :: file_id       ! File identifier 
     INTEGER(HID_T) :: dset_id       ! Dataset identifier 
     INTEGER(HID_T) :: dspace_id     ! Dataspace identifier
     INTEGER(HID_T) :: dcpl          ! Dataset Creation Property List ID

     INTEGER     ::   error ! Error flag
     INTEGER     ::  i, j

     INTEGER, DIMENSION(500,20) :: dset_data  ! Data buffers
     INTEGER(HSIZE_T), DIMENSION(2) :: data_dims
     INTEGER(HSIZE_T), DIMENSION(2) :: chunk_dims = (/20,20/)
     INTEGER :: rank_chunk = 2


     INTEGER(HSIZE_T), DIMENSION(2) :: dims = (/500, 20/) ! Dataset dimensions
     INTEGER     ::   rank = 2                        ! Dataset rank

     ! Initialize FORTRAN predefined datatypes.
     !
     CALL h5open_f (error)

     ! Create a new file 
     ! 
     CALL h5fcreate_f (filename, H5F_ACC_TRUNC_F, file_id, error, &
                       H5P_DEFAULT_F, H5P_DEFAULT_F)

     ! Create the dataspace.
     !
     CALL h5screate_simple_f (rank, dims, dspace_id, error)

     ! Set Dataset Creation Property List to create chunked dataset
     ! and to use zlib compression.
     !
     CALL h5pcreate_f (H5P_DATASET_CREATE_F, dcpl, error) 
     CALL h5pset_chunk_f (dcpl, rank_chunk, chunk_dims, error)
     
     CALL h5pset_shuffle_f (dcpl, error)
     CALL h5pset_deflate_f (dcpl, 6, error)

     ! Create the dataset with default properties.
     !
     CALL h5dcreate_f (file_id, dsetname, H5T_NATIVE_INTEGER, dspace_id, &
                       dset_id, error, dcpl)

     ! Initialize the dset_data array.
     !
     do i = 1, dims(1)
          do j = 1,  dims(2)
               dset_data(i,j) = (i-1)*6 + j -1
          end do
     end do
     do i = 3, 100
          do j = 3, 20 
               dset_data(i,j) = 0
          end do
     end do

     ! Write the dataset.
     !
     data_dims(1) = dims(1) 
     data_dims(2) = dims(2)
     CALL h5dwrite_f (dset_id, H5T_NATIVE_INTEGER, dset_data, data_dims, error)

     ! End access to the dataset, dataspace, property list, and file.
     ! 
     CALL h5pclose_f (dcpl, error)
     CALL h5dclose_f (dset_id, error)
     CALL h5sclose_f (dspace_id, error)
     CALL h5fclose_f (file_id, error)

     ! Close FORTRAN predefined datatypes.
     !
     CALL h5close_f (error)

     END PROGRAM DSETSHUFFLE