!> @defgroup FH5D Fortran Datasets (H5D) Interface
!!
!! @see H5D, C-API
!!
!! @see @ref H5D_UG, User Guide
!!

!> @ingroup FH5D
!!
!! @brief This module contains Fortran interfaces for H5D functions.
!
! COPYRIGHT
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!   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.                                                        *
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!
! NOTES
!  (1) The maximum rank of an array allowed in Fortran is 7, therefore
!  we only provide an interface for arrays up to and including rank 7.
!
!  (2) Unfortunately we are using a generic interface and one of the factors
!  used in determining the proper routine to select is that of the array
!  rank being passed. Therefore, we can not create just one subroutine for
!  each array type (integer, real, etc...) and use a
!  rank 1 array of assumed size to handle multiple ranks, i.e.
!  (i.e. integer, dimension(*) :: ... )
!  (i.e. real   , dimension(*) :: ... ) etc...
!
!  (3) Could not place the USE, INTRINSIC :: ISO_C_BINDING in the module header because it may
!  conflict with the USE, INTRINSIC :: ISO_C_BINDING included in the user's program. Moved
!  the statement instead to each subroutine.
!
!
!  (4) C_LOC and character strings according to the Fortran 2003 standard:
!
!  15.1.2.5 C_LOC(X)
!
!  Argument. X shall either
!
!  (A) have interoperable type and type parameters and be
!  (a) a variable that has the TARGET attribute and is interoperable,
!  (b) an allocated allocatable variable that has the TARGET attribute
!  and is not an array of zero size, or
!  (c) an associated scalar pointer, or
!  (B) be a nonpolymorphic scalar, have no length type parameters, and be
!  (a) a nonallocatable, nonpointer variable that has the TARGET attribute,
!  (b) an allocated allocatable variable that has the TARGET attribute, or
!  (c) an associated pointer.
!
!          - When X is a character, for interoperability the standard is:
!
!  15.2.1 Interoperability of intrinsic types
!
!  ...if the type is character, interoperability also requires that the length type parameter
!  be omitted or be specified by an initialization expression whose value is one.
!
!  THEREFORE compilers that have not extended the standard require the
!  argument in C_LOC to be of the variant:
!
!  CHARACTER(LEN=1), TARGET :: chr
!  or
!  CHARACTER, TARGET :: chr
!
!       _____ __  __ _____   ____  _____ _______       _   _ _______
!      |_   _|  \/  |  __ \ / __ \|  __ \__   __|/\   | \ | |__   __|
! ****   | | | \  / | |__) | |  | | |__) | | |  /  \  |  \| |  | |    ****
! ****   | | | |\/| |  ___/| |  | |  _  /  | | / /\ \ | . ` |  | |    ****
! ****  _| |_| |  | | |    | |__| | | \ \  | |/ ____ \| |\  |  | |    ****
!      |_____|_|  |_|_|     \____/|_|  \_\ |_/_/    \_\_| \_|  |_|
!
!  If you add a new H5D function you must add the function name to the
!  Windows dll file 'hdf5_fortrandll.def.in' in the fortran/src directory.
!  This is needed for Windows based operating systems.
!

#include <H5config_f.inc>

MODULE H5D

  USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR, C_CHAR
  USE H5GLOBAL

  PRIVATE h5dread_vl_integer, h5dread_vl_real, h5dread_vl_string
  PRIVATE h5dwrite_vl_integer, h5dwrite_vl_real, h5dwrite_vl_string
  PRIVATE h5dwrite_reference_obj, h5dwrite_reference_dsetreg, h5dwrite_char_scalar, h5dwrite_ptr
  PRIVATE h5dread_reference_obj, h5dread_reference_dsetreg, h5dread_char_scalar, h5dread_ptr
  PRIVATE h5dfill_integer, h5dfill_c_float, h5dfill_c_double, h5dfill_char
#if H5_FORTRAN_C_LONG_DOUBLE_IS_UNIQUE!=0
  PRIVATE h5dfill_c_long_double
#endif

  INTERFACE h5dextend_f
     MODULE PROCEDURE h5dset_extent_f
  END INTERFACE

#ifndef H5_DOXYGEN_FORTRAN

  INTERFACE h5dwrite_f
     MODULE PROCEDURE h5dwrite_reference_obj
     MODULE PROCEDURE h5dwrite_reference_dsetreg
     MODULE PROCEDURE h5dwrite_char_scalar
     ! This is the preferred way to call h5dwrite
     ! by passing an address
     MODULE PROCEDURE h5dwrite_ptr
  END INTERFACE

  INTERFACE h5dread_f
     MODULE PROCEDURE h5dread_reference_obj
     MODULE PROCEDURE h5dread_reference_dsetreg
     MODULE PROCEDURE h5dread_char_scalar
     ! This is the preferred way to call h5dread
     ! by passing an address
     MODULE PROCEDURE h5dread_ptr
  END INTERFACE

  INTERFACE h5dread_vl_f
     MODULE PROCEDURE h5dread_vl_integer
     MODULE PROCEDURE h5dread_vl_real
     MODULE PROCEDURE h5dread_vl_string
  END INTERFACE

  INTERFACE h5dwrite_vl_f
     MODULE PROCEDURE h5dwrite_vl_integer
     MODULE PROCEDURE h5dwrite_vl_real
     MODULE PROCEDURE h5dwrite_vl_string
  END INTERFACE


!  Interface for the function used to pass the C pointer of the buffer
!  to the C H5Dwrite routine

  INTERFACE
     INTEGER FUNCTION h5dwrite_f_c(dset_id, mem_type_id, &
          mem_space_id_default ,                         &
          file_space_id_default,                         &
          xfer_prp_default, buf ) BIND(C, NAME='h5dwrite_f_c')
       IMPORT :: c_ptr
       IMPORT :: HID_T
       IMPLICIT NONE
       INTEGER(HID_T), INTENT(IN) :: dset_id
       INTEGER(HID_T), INTENT(IN) :: mem_type_id
       INTEGER(HID_T) :: mem_space_id_default
       INTEGER(HID_T) :: file_space_id_default
       INTEGER(HID_T) :: xfer_prp_default
       TYPE(C_PTR), VALUE :: buf
     END FUNCTION h5dwrite_f_c
  END INTERFACE

!  Interface for the function used to pass the C pointer of the buffer
!  to the C H5Dread routine

  INTERFACE
     INTEGER FUNCTION h5dread_f_c(dset_id, mem_type_id, &
          mem_space_id_default,                         &
          file_space_id_default,                        &
          xfer_prp_default, buf) BIND(C, NAME='h5dread_f_c')
       IMPORT :: c_ptr
       IMPORT :: HID_T
       IMPLICIT NONE
       INTEGER(HID_T), INTENT(IN) :: dset_id
       INTEGER(HID_T), INTENT(IN) :: mem_type_id
       INTEGER(HID_T) :: mem_space_id_default
       INTEGER(HID_T) :: file_space_id_default
       INTEGER(HID_T) :: xfer_prp_default
       TYPE(C_PTR), VALUE :: buf
     END FUNCTION h5dread_f_c
  END INTERFACE

  INTERFACE h5dfill_f
     MODULE PROCEDURE h5dfill_integer
     MODULE PROCEDURE h5dfill_c_float
     MODULE PROCEDURE h5dfill_c_double
#if H5_FORTRAN_C_LONG_DOUBLE_IS_UNIQUE!=0
     MODULE PROCEDURE h5dfill_c_long_double
#endif
     MODULE PROCEDURE h5dfill_char
  END INTERFACE

!  Interface for the function used to pass the C pointer of the buffer
!  to the C H5Dfill routine

  INTERFACE
     INTEGER FUNCTION h5dfill_c(f_ptr_fill_value, fill_type_id, space_id, &
          f_ptr_buf, mem_type_id) BIND(C, NAME='h5dfill_c')
       IMPORT :: c_ptr
       IMPORT :: HID_T
       IMPLICIT NONE
       TYPE(C_PTR), VALUE :: f_ptr_fill_value
       INTEGER(HID_T) :: fill_type_id
       INTEGER(HID_T), INTENT(IN) :: space_id
       TYPE(C_PTR), VALUE :: f_ptr_buf
       INTEGER(HID_T) :: mem_type_id
     END FUNCTION h5dfill_c
  END INTERFACE
#endif

CONTAINS

!>
!! \ingroup FH5D
!!
!! \brief Creates a dataset at the specified location.
!!
!! \param loc_id   File or group identifier
!! \param name     Dataset name
!! \param type_id  Dataset datatype identifier
!! \param space_id Dataset dataspace identifier
!! \param dset_id  Dataset identifier
!! \param hdferr   \fortran_error
!! \param dcpl_id  Dataset creation property list
!! \param lcpl_id  Link creation property list
!! \param dapl_id  Dataset access property list
!!
  SUBROUTINE h5dcreate_f(loc_id, name, type_id, space_id, dset_id, &
       hdferr, dcpl_id, lcpl_id, dapl_id)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: loc_id
    CHARACTER(LEN=*), INTENT(IN) :: name
    INTEGER(HID_T), INTENT(IN) :: type_id
    INTEGER(HID_T), INTENT(IN) :: space_id
    INTEGER(HID_T), INTENT(OUT) :: dset_id
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: dcpl_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: lcpl_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: dapl_id

    INTEGER(HID_T) :: lcpl_id_default
    INTEGER(HID_T) :: dcpl_id_default
    INTEGER(HID_T) :: dapl_id_default

    INTEGER :: namelen ! Name length

    INTERFACE
       INTEGER FUNCTION h5dcreate_c(loc_id, name, namelen, type_id, &
            space_id, lcpl_id_default, dcpl_id_default, dapl_id_default, dset_id) &
            BIND(C,NAME='h5dcreate_c')
         IMPORT :: C_CHAR
         IMPORT :: HID_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: loc_id
         CHARACTER(KIND=C_CHAR), DIMENSION(*), INTENT(IN) :: name
         INTEGER :: namelen
         INTEGER(HID_T), INTENT(IN) :: type_id
         INTEGER(HID_T), INTENT(IN) :: space_id

         INTEGER(HID_T) :: lcpl_id_default
         INTEGER(HID_T) :: dcpl_id_default
         INTEGER(HID_T) :: dapl_id_default

         INTEGER(HID_T), INTENT(OUT) :: dset_id
       END FUNCTION h5dcreate_c
    END INTERFACE

    lcpl_id_default = H5P_DEFAULT_F
    dcpl_id_default = H5P_DEFAULT_F
    dapl_id_default = H5P_DEFAULT_F

    IF(PRESENT(lcpl_id)) lcpl_id_default = lcpl_id
    IF(PRESENT(dcpl_id)) dcpl_id_default = dcpl_id
    IF(PRESENT(dapl_id)) dapl_id_default = dapl_id

    namelen = LEN(name)
    hdferr = h5dcreate_c(loc_id, name, namelen, type_id, space_id, &
         lcpl_id_default, dcpl_id_default, dapl_id_default, dset_id)

  END SUBROUTINE h5dcreate_f

!>
!! \ingroup FH5D
!!
!! \brief Opens an existing dataset.
!!
!! \param loc_id  File or group identifier
!! \param name    Dataset name
!! \param dset_id Dataset identifier
!! \param hdferr  \fortran_error
!! \param dapl_id Dataset access property list
!!
  SUBROUTINE h5dopen_f(loc_id, name, dset_id, hdferr, dapl_id)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: loc_id
    CHARACTER(LEN=*), INTENT(IN) :: name
    INTEGER(HID_T), INTENT(OUT) :: dset_id
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: dapl_id
    INTEGER :: namelen                     ! Name length

    INTEGER(HID_T) :: dapl_id_default

    INTERFACE
       INTEGER FUNCTION h5dopen_c(loc_id, name, namelen, dapl_id_default, dset_id) &
            BIND(C,NAME='h5dopen_c')
         IMPORT :: C_CHAR
         IMPORT :: HID_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: loc_id
         CHARACTER(KIND=C_CHAR), DIMENSION(*), INTENT(IN) :: name
         INTEGER :: namelen
         INTEGER(HID_T), INTENT(IN) :: dapl_id_default
         INTEGER(HID_T), INTENT(OUT) :: dset_id
       END FUNCTION h5dopen_c
    END INTERFACE

    dapl_id_default = H5P_DEFAULT_F
    IF(PRESENT(dapl_id)) dapl_id_default = dapl_id

    namelen = LEN(name)
    hdferr = h5dopen_c(loc_id, name, namelen, dapl_id_default, dset_id)

  END SUBROUTINE h5dopen_f

!>
!! \ingroup FH5D
!!
!! \brief Closes a dataset.
!!
!! \param dset_id Dataset identifier
!! \param hdferr  \fortran_error
!!
  SUBROUTINE h5dclose_f(dset_id, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER, INTENT(OUT) :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dclose_c(dset_id) &
            BIND(C,NAME='h5dclose_c')
         IMPORT :: HID_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
       END FUNCTION h5dclose_c
    END INTERFACE

    hdferr = h5dclose_c(dset_id)

  END SUBROUTINE h5dclose_f

!>
!! \ingroup FH5D
!!
!! \brief Returns an identifier for a copy of the datatype for a
!!       dataset.
!!
!! \param dataset_id  Dataset identifier
!! \param datatype_id Dataspace identifier
!! \param hdferr      \fortran_error
!!
  SUBROUTINE h5dget_type_f(dataset_id, datatype_id, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dataset_id
    INTEGER(HID_T), INTENT(OUT) :: datatype_id
    INTEGER, INTENT(OUT) :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dget_type_c(dataset_id, datatype_id) &
            BIND(C,NAME='h5dget_type_c')
         IMPORT :: HID_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dataset_id
         INTEGER(HID_T), INTENT(OUT) :: datatype_id
       END FUNCTION h5dget_type_c
    END INTERFACE

    hdferr = h5dget_type_c (dataset_id, datatype_id)
  END SUBROUTINE h5dget_type_f

!>
!! \ingroup FH5D
!!
!! \brief Extends a dataset with unlimited dimension.
!!
!! \param dataset_id Dataset identifier
!! \param size       Array containing the new magnitude of each dimension
!! \param hdferr     \fortran_error
!!
  SUBROUTINE h5dset_extent_f(dataset_id, size, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dataset_id
    INTEGER(HSIZE_T), DIMENSION(*), INTENT(IN)  :: size
    INTEGER, INTENT(OUT) :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dset_extent_c(dataset_id, size) &
            BIND(C,NAME='h5dset_extent_c')
         IMPORT :: HID_T, HSIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dataset_id
         INTEGER(HSIZE_T), DIMENSION(*), INTENT(IN)  :: size
       END FUNCTION h5dset_extent_c
    END INTERFACE

    hdferr = H5Dset_extent_c(dataset_id, size)
  END SUBROUTINE h5dset_extent_f

!>
!! \ingroup FH5D
!!
!! \brief Returns an identifier for a copy of the dataset creation property list for a dataset.
!!
!! \param dataset_id Dataset identifier
!! \param plist_id   Creation property list identifier
!! \param hdferr     \fortran_error
!!
  SUBROUTINE h5dget_create_plist_f(dataset_id, plist_id, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dataset_id
    INTEGER(HID_T), INTENT(OUT) :: plist_id
    INTEGER, INTENT(OUT) :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dget_create_plist_c(dataset_id, plist_id) &
            BIND(C,NAME='h5dget_create_plist_c')
         IMPORT :: HID_T
         INTEGER(HID_T), INTENT(IN) :: dataset_id
         INTEGER(HID_T), INTENT(OUT) :: plist_id
       END FUNCTION h5dget_create_plist_c
    END INTERFACE

    hdferr = h5dget_create_plist_c(dataset_id, plist_id)
  END SUBROUTINE h5dget_create_plist_f

!>
!! \ingroup FH5D
!!
!! \brief Returns the amount of storage requires by a dataset
!!
!! \param dataset_id Dataset identifier
!! \param size       Datastorage size
!! \param hdferr     \fortran_error
!!
  SUBROUTINE h5dget_storage_size_f(dataset_id, size, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dataset_id
    INTEGER(HSIZE_T),  INTENT(OUT)  :: size
    INTEGER, INTENT(OUT) :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dget_storage_size_c(dataset_id, size) &
            BIND(C,NAME='h5dget_storage_size_c')
         IMPORT :: HID_T, HSIZE_T
         INTEGER(HID_T), INTENT(IN) :: dataset_id
         INTEGER(HSIZE_T), INTENT(OUT)  :: size
       END FUNCTION h5dget_storage_size_c
    END INTERFACE

    hdferr = h5dget_storage_size_c(dataset_id, size)
  END SUBROUTINE h5dget_storage_size_f

!>
!! \ingroup FH5D
!!
!! \brief Returns maximum length of the VL array elements
!!
!! \param dataset_id Dataset identifier
!! \param type_id    Datatype identifier
!! \param space_id   Dataspace identifier
!! \param len        Buffer size
!! \param hdferr     \fortran_error
!!
  SUBROUTINE h5dvlen_get_max_len_f(dataset_id, type_id, space_id, len,  hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dataset_id
    INTEGER(HID_T), INTENT(IN) :: type_id
    INTEGER(HID_T), INTENT(IN) :: space_id
    INTEGER(SIZE_T),  INTENT(OUT)  :: len
    INTEGER, INTENT(OUT) :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dvlen_get_max_len_c(dataset_id, type_id, space_id, len) &
            BIND(C,NAME='h5dvlen_get_max_len_c')
         IMPORT :: HID_T, SIZE_T
         INTEGER(HID_T), INTENT(IN) :: dataset_id
         INTEGER(HID_T), INTENT(IN) :: type_id
         INTEGER(HID_T), INTENT(IN) :: space_id
         INTEGER(SIZE_T), INTENT(OUT)  :: len
       END FUNCTION h5dvlen_get_max_len_c
    END INTERFACE

    hdferr = h5dvlen_get_max_len_c(dataset_id, type_id,  space_id, len)
  END SUBROUTINE h5dvlen_get_max_len_f

!>
!! \ingroup FH5D
!!
!! \brief Returns the status of data space allocation.
!!
!! \param dset_id Dataset identifier
!! \param flag    Status; may have one of the following values:
!!                \li H5D_SPACE_STS_ERROR_F
!!                \li H5D_SPACE_STS_NOT_ALLOCATED_F
!!                \li H5D_SPACE_STS_PART_ALLOCATED_F
!!                \li H5D_SPACE_STS_ALLOCATED_F
!! \param hdferr  \fortran_error
!!
  SUBROUTINE h5dget_space_status_f(dset_id, flag, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER, INTENT(OUT)       :: flag
    INTEGER, INTENT(OUT)       :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dget_space_status_c(dset_id, flag) &
            BIND(C,NAME='h5dget_space_status_c')
         IMPORT :: HID_T
         INTEGER(HID_T) :: dset_id
         INTEGER        :: flag
       END FUNCTION h5dget_space_status_c
    END INTERFACE

    hdferr = h5dget_space_status_c(dset_id, flag)
  END SUBROUTINE h5dget_space_status_f

!>
!! \ingroup FH5D
!!
!! \brief Creates a dataset in a file without linking it into the file structure
!!
!! \param loc_id   Identifier of the file or group within which to create the dataset.
!! \param type_id  Identifier of the datatype to use when creating the dataset.
!! \param space_id Identifier of the dataspace to use when creating the dataset.
!! \param dset_id  Dataset identifier.
!! \param hdferr   \fortran_error
!! \param dcpl_id  Dataset creation property list identifier.
!! \param dapl_id  Dataset access property list identifier.
!!
  SUBROUTINE h5dcreate_anon_f(loc_id, type_id, space_id, dset_id, hdferr, dcpl_id, dapl_id)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: loc_id
    INTEGER(HID_T), INTENT(IN) :: type_id
    INTEGER(HID_T), INTENT(IN) :: space_id
    INTEGER(HID_T), INTENT(OUT) :: dset_id
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: dcpl_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: dapl_id
    INTEGER(HID_T) :: dcpl_id_default
    INTEGER(HID_T) :: dapl_id_default

    !
    !  MS FORTRAN needs explicit interface for C functions called here.
    !
    INTERFACE
       INTEGER FUNCTION h5dcreate_anon_c(loc_id, type_id, space_id, dcpl_id_default, dapl_id_default, dset_id) &
            BIND(C,NAME='h5dcreate_anon_c')
         IMPORT :: HID_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: loc_id
         INTEGER(HID_T), INTENT(IN) :: type_id
         INTEGER(HID_T), INTENT(IN) :: space_id
         INTEGER(HID_T) :: dcpl_id_default
         INTEGER(HID_T) :: dapl_id_default
         INTEGER(HID_T), INTENT(OUT) :: dset_id
       END FUNCTION h5dcreate_anon_c
    END INTERFACE

    dcpl_id_default = H5P_DEFAULT_F
    dapl_id_default = H5P_DEFAULT_F

    IF(PRESENT(dcpl_id)) dcpl_id_default = dcpl_id
    IF(PRESENT(dapl_id)) dapl_id_default = dapl_id

    hdferr = h5dcreate_anon_c(loc_id, type_id, space_id, dcpl_id_default, dapl_id_default, dset_id)

  END SUBROUTINE h5dcreate_anon_f

#if H5_DOXYGEN_FORTRAN
  !>
  !! \ingroup FH5D
  !!
  !! \brief Reads variable-length data. F2003 API h5dread_f should be used instead.
  !!
  !! \param dset_id       Dataset identifier.
  !! \param mem_type_id   Memory datatype identifier.
  !! \param buf           Data buffer; may be a scalar or an array, TYPE(TYPE) must be one of the following:
  !!                      \li INTEGER
  !!                      \li REAL
  !!                      \li CHARACTER
  !! \param dims          Array to hold corresponding dimension sizes of data buffer buf, dim(k) has value of the k-th
  !!                      dimension of buffer buf. Values are ignored if buf is a scalar.
  !! \param len           Array to store length of each element.
  !! \param hdferr        \fortran_error
  !! \param mem_space_id  Memory dataspace identifier, default value is H5S_ALL_F.
  !! \param file_space_id File dataspace identifier, default value is H5S_ALL_F.
  !! \param xfer_prp      Transfer property list identifier, default value is H5P_DEFAULT_F.
  !!
  SUBROUTINE h5dread_vl_f(dset_id, mem_type_id, buf, dims, len, hdferr, mem_space_id, file_space_id, xfer_prp)
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    TYPE(TYPE), INTENT(INOUT), DIMENSION(dims(1),dims(2)) :: buf

    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2)  :: dims
    INTEGER(SIZE_T), INTENT(INOUT), DIMENSION(*)  :: len
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
  END SUBROUTINE h5dread_vl_f
  !>
  !! \ingroup FH5D
  !!
  !! \brief Writes variable-length data. F2003 API h5dwritef should be used instead.
  !!
  !! \param dset_id       Dataset identifier.
  !! \param mem_type_id   Memory datatype identifier.
  !! \param buf           Data buffer; may be a scalar or an array, TYPE(TYPE) must be one of the following:
  !!                      \li INTEGER
  !!                      \li REAL
  !!                      \li CHARACTER
  !! \param dims          Array to hold corresponding dimension sizes of data buffer buf, dim(k) has value of the k-th
  !!                      dimension of buffer buf. Values are ignored if buf is a scalar.
  !! \param len           Array to store length of each element.
  !! \param hdferr        \fortran_error
  !! \param mem_space_id  Memory dataspace identifier, default value is H5S_ALL_F.
  !! \param file_space_id File dataspace identifier, default value is H5S_ALL_F.
  !! \param xfer_prp      Transfer property list identifier, default value is H5P_DEFAULT_F.
  !!
  SUBROUTINE h5dwrite_vl_f(dset_id, mem_type_id, buf, dims, len, hdferr, mem_space_id, file_space_id, xfer_prp)
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    TYPE(TYPE), INTENT(IN),DIMENSION(dims(1),dims(2)) :: buf
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2)  :: dims
    INTEGER(SIZE_T), INTENT(IN), DIMENSION(*)  :: len
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
  END SUBROUTINE h5dwrite_vl_f

#else
  SUBROUTINE h5dwrite_vl_integer(dset_id, mem_type_id, buf, dims, len, &
       hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2) :: dims
    INTEGER(SIZE_T), INTENT(IN), DIMENSION(*) :: len
    INTEGER, INTENT(IN), DIMENSION(dims(1),dims(2)), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default

    INTERFACE
       INTEGER FUNCTION h5dwrite_vl_integer_c(dset_id, mem_type_id, &
            mem_space_id_default, &
            file_space_id_default, &
            xfer_prp_default, buf, dims, len) &
            BIND(C,NAME='h5dwrite_vl_integer_c')
         IMPORT :: HID_T, HSIZE_T, SIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(IN) :: mem_type_id
         INTEGER(HID_T)  :: mem_space_id_default
         INTEGER(HID_T) :: file_space_id_default
         INTEGER(HID_T) :: xfer_prp_default
         INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
         INTEGER(SIZE_T), INTENT(IN), DIMENSION(*) :: len
         INTEGER, INTENT(IN), DIMENSION(dims(1),dims(2)) :: buf
       END FUNCTION h5dwrite_vl_integer_c
    END INTERFACE

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF (PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF (PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF (PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dwrite_vl_integer_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, &
         buf, dims, len)

  END SUBROUTINE h5dwrite_vl_integer

  SUBROUTINE h5dread_vl_integer(dset_id, mem_type_id, buf, dims, len, &
       hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2) :: dims
    INTEGER(SIZE_T), INTENT(INOUT), DIMENSION(*) :: len
    INTEGER, INTENT(INOUT), DIMENSION(dims(1),dims(2)), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T)  :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default
    INTEGER(HID_T) :: tmp
    INTEGER :: error

    INTERFACE
       INTEGER FUNCTION h5dread_vl_integer_c(dset_id, mem_type_id, &
            mem_space_id_default, &
            file_space_id_default, &
            xfer_prp_default, buf, dims, len) &
            BIND(C,NAME='h5dread_vl_integer_c')
         IMPORT :: HID_T, HSIZE_T, SIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(IN) :: mem_type_id
         INTEGER(HID_T)  :: mem_space_id_default
         INTEGER(HID_T) :: file_space_id_default
         INTEGER(HID_T) :: xfer_prp_default
         INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
         INTEGER(SIZE_T), INTENT(INOUT), DIMENSION(*) :: len
         INTEGER, INTENT(INOUT), DIMENSION(dims(1),dims(2)) :: buf
       END FUNCTION h5dread_vl_integer_c
    END INTERFACE

    CALL h5dget_space_f(dset_id, tmp, error)
    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = tmp
    file_space_id_default = tmp

    IF (PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF (PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF (PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dread_vl_integer_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, &
         buf, dims, len)

  END SUBROUTINE h5dread_vl_integer

  SUBROUTINE h5dwrite_vl_real(dset_id, mem_type_id, buf, dims, len, &
       hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2) :: dims
    INTEGER(SIZE_T), INTENT(IN), DIMENSION(*) :: len
    REAL, INTENT(IN), &
         DIMENSION(dims(1),dims(2)) :: buf ! Data buffer
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default

    INTERFACE
       INTEGER FUNCTION h5dwrite_vl_real_c(dset_id, mem_type_id, &
            mem_space_id_default, &
            file_space_id_default, &
            xfer_prp_default, buf, dims, len) &
            BIND(C,NAME='h5dwrite_vl_real_c')
         IMPORT :: HID_T, HSIZE_T, SIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(IN) :: mem_type_id
         INTEGER(HID_T)  :: mem_space_id_default
         INTEGER(HID_T) :: file_space_id_default
         INTEGER(HID_T) :: xfer_prp_default
         INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
         INTEGER(SIZE_T), INTENT(IN), DIMENSION(*) :: len
         REAL, INTENT(IN), &
              DIMENSION(dims(1),dims(2)) :: buf
       END FUNCTION h5dwrite_vl_real_c
    END INTERFACE


    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF (PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF (PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF (PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dwrite_vl_real_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, &
         buf, dims, len)

  END SUBROUTINE h5dwrite_vl_real

  SUBROUTINE h5dread_vl_real(dset_id, mem_type_id, buf, dims, len, &
       hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2) :: dims
    INTEGER(SIZE_T), INTENT(INOUT), DIMENSION(*) :: len
    REAL, INTENT(INOUT), &
         DIMENSION(dims(1),dims(2)) :: buf ! Data buffer
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T)  :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default
    INTEGER(HID_T) :: tmp
    INTEGER :: error

    INTERFACE
       INTEGER FUNCTION h5dread_vl_real_c(dset_id, mem_type_id, &
            mem_space_id_default, &
            file_space_id_default, &
            xfer_prp_default, buf, dims, len) &
            BIND(C,NAME='h5dread_vl_real_c')
         IMPORT :: HID_T, HSIZE_T, SIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(IN) :: mem_type_id
         INTEGER(HID_T)  :: mem_space_id_default
         INTEGER(HID_T) :: file_space_id_default
         INTEGER(HID_T) :: xfer_prp_default
         INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
         INTEGER(SIZE_T), INTENT(INOUT), DIMENSION(*) :: len
         REAL, INTENT(INOUT), &
              DIMENSION(dims(1),dims(2)) :: buf
       END FUNCTION h5dread_vl_real_c
    END INTERFACE

    CALL h5dget_space_f(dset_id, tmp, error)
    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = tmp
    file_space_id_default = tmp

    IF (PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF (PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF (PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dread_vl_real_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, &
         buf, dims, len)

  END SUBROUTINE h5dread_vl_real

  SUBROUTINE h5dwrite_vl_string(dset_id, mem_type_id, buf, dims, str_len, &
       hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_CHAR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2) :: dims
    INTEGER(SIZE_T), INTENT(IN), DIMENSION(*) :: str_len
    CHARACTER(LEN=*), INTENT(IN), DIMENSION(dims(2)) :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T)  :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default

    INTERFACE
       INTEGER FUNCTION h5dwrite_vl_string_c(dset_id, mem_type_id, &
            mem_space_id_default, &
            file_space_id_default, &
            ! xfer_prp_default, tmp_buf, dims, str_len)
            xfer_prp_default, buf, dims, str_len) &
            BIND(C,NAME='h5dwrite_vl_string_c')
         IMPORT :: C_CHAR
         IMPORT :: HID_T, HSIZE_T, SIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(IN) :: mem_type_id
         INTEGER(HID_T)  :: mem_space_id_default
         INTEGER(HID_T) :: file_space_id_default
         INTEGER(HID_T) :: xfer_prp_default
         INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2) :: dims
         INTEGER(SIZE_T), INTENT(IN), DIMENSION(*) :: str_len
         CHARACTER(KIND=C_CHAR), DIMENSION(dims(2)) :: buf
       END FUNCTION
    END INTERFACE


    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF (PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF (PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF (PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dwrite_vl_string_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, &
         buf, dims, str_len)

  END SUBROUTINE h5dwrite_vl_string

  SUBROUTINE h5dread_vl_string(dset_id, mem_type_id, buf, dims, str_len, &
       hdferr, mem_space_id, file_space_id, xfer_prp)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2) :: dims
    INTEGER(SIZE_T), INTENT(OUT), DIMENSION(*) :: str_len
    CHARACTER(LEN=*), INTENT(OUT), &
         DIMENSION(dims(2)) :: buf      ! Data buffer
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T)  :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default

    INTERFACE
       INTEGER FUNCTION h5dread_vl_string_c(dset_id, mem_type_id, &
            mem_space_id_default, &
            file_space_id_default, &
            xfer_prp_default, buf, dims, str_len) &
            BIND(C,NAME='h5dread_vl_string_c')
         IMPORT :: c_char
         IMPORT :: HID_T, HSIZE_T, SIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(IN) :: mem_type_id
         INTEGER(HID_T)  :: mem_space_id_default
         INTEGER(HID_T) :: file_space_id_default
         INTEGER(HID_T) :: xfer_prp_default
         INTEGER(HSIZE_T), INTENT(IN), DIMENSION(2) :: dims
         INTEGER(SIZE_T), INTENT(OUT), DIMENSION(*) :: str_len
         CHARACTER(KIND=C_CHAR), DIMENSION(dims(2)) :: buf
       END FUNCTION h5dread_vl_string_c
    END INTERFACE

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF (PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF (PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF (PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dread_vl_string_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, &
         buf, dims, str_len)
    RETURN
  END SUBROUTINE h5dread_vl_string
#endif

!>
!! \ingroup FH5D
!!
!! \brief Returns dataset address in file.
!!
!! \param dset_id Dataset identifier.
!! \param offset  The offset in bytes.
!! \param hdferr  \fortran_error
!!
  SUBROUTINE h5dget_offset_f(dset_id, offset, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN)    :: dset_id
    INTEGER(HADDR_T), INTENT(OUT) :: offset
    INTEGER, INTENT(OUT)          :: hdferr
    INTERFACE
       INTEGER(HADDR_T) FUNCTION h5dget_offset(dset_id) BIND(C,NAME='H5Dget_offset')
         IMPORT :: HID_T, HADDR_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN), VALUE :: dset_id
       END FUNCTION h5dget_offset
    END INTERFACE

    offset = h5dget_offset(dset_id)

    hdferr = 0 ! never returns a function error because C API never returns a function error.

  END SUBROUTINE h5dget_offset_f

!>
!! \ingroup FH5D
!!
!! \brief Returns an identifier for a copy of the dataspace for a
!!       dataset.
!!
!! \param dataset_id   Dataset identifier.
!! \param dataspace_id Dataspace identifier.
!! \param hdferr       \fortran_error
!!
  SUBROUTINE h5dget_space_f(dataset_id, dataspace_id, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dataset_id
    INTEGER(HID_T), INTENT(OUT) :: dataspace_id
    INTEGER, INTENT(OUT) :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dget_space_c(dataset_id, dataspace_id) BIND(C,NAME='h5dget_space_c')
         IMPORT :: HID_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dataset_id
         INTEGER(HID_T), INTENT(OUT) :: dataspace_id
       END FUNCTION h5dget_space_c
    END INTERFACE

    hdferr = h5dget_space_c(dataset_id, dataspace_id)
  END SUBROUTINE h5dget_space_f

!>
!! \ingroup FH5D
!!
!! \brief Returns a copy of the dataset creation property list.
!!
!! \param dset_id  Dataset identifier.
!! \param plist_id Dataset access property list identifier.
!! \param hdferr   \fortran_error
!!
  SUBROUTINE h5dget_access_plist_f(dset_id, plist_id, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN)  :: dset_id
    INTEGER(HID_T), INTENT(OUT) :: plist_id
    INTEGER       , INTENT(OUT) :: hdferr
    INTERFACE
       INTEGER FUNCTION h5dget_access_plist_c(dset_id, plist_id) BIND(C,NAME='h5dget_access_plist_c')
         IMPORT :: HID_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(OUT) :: plist_id
       END FUNCTION h5dget_access_plist_c
    END INTERFACE

    hdferr = h5dget_access_plist_c(dset_id, plist_id)

  END SUBROUTINE h5dget_access_plist_f

!>
!! \ingroup FH5D
!!
!! \brief Reclaims VL datatype memory buffers.
!!
!! \param type_id  Identifier of the datatype.
!! \param space_id Identifier of the dataspace.
!! \param plist_id Identifier of the property list used to create the buffer.
!! \param buf      Pointer to the buffer to be reclaimed.
!! \param hdferr   \fortran_error
!!
  SUBROUTINE h5dvlen_reclaim_f(type_id, space_id, plist_id, buf, hdferr)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN)    :: type_id
    INTEGER(HID_T), INTENT(IN)    :: space_id
    INTEGER(HID_T), INTENT(IN)    :: plist_id
    TYPE(C_PTR)   , INTENT(INOUT) :: buf
    INTEGER       , INTENT(OUT)   :: hdferr

    INTERFACE
       INTEGER FUNCTION h5dvlen_reclaim_c(type_id, space_id, plist_id, buf) BIND(C, NAME='h5dvlen_reclaim_c')
         IMPORT :: C_PTR
         IMPORT :: HID_T
         IMPLICIT NONE
         INTEGER(HID_T) :: type_id
         INTEGER(HID_T) :: space_id
         INTEGER(HID_T) :: plist_id
         TYPE(C_PTR), VALUE :: buf
       END FUNCTION h5dvlen_reclaim_c
    END INTERFACE

    hdferr = H5Dvlen_reclaim_c(type_id, space_id, plist_id, buf)

  END SUBROUTINE H5Dvlen_reclaim_f

#ifdef H5_DOXYGEN_FORTRAN
!>
!! \ingroup FH5D
!!
!! \brief Writes raw data from a dataset into a buffer.
!!
!! \note  \fortran_approved
!!
!! \param dset_id       Identifier of the dataset to write to.
!! \param mem_type_id   Identifier of the memory datatype.
!! \param buf           Buffer with data to be written to the file.
!! \param hdferr        \fortran_error
!! \param mem_space_id  Identifier of the memory dataspace.
!! \param file_space_id Identifier of the dataset&apos;s dataspace in the file.
!! \param xfer_prp      Identifier of a transfer property list for this I/O operation.
!!
  SUBROUTINE h5dwrite_f(dset_id, mem_type_id, buf, hdferr, mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    TYPE(C_PTR), INTENT(IN) :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
  END SUBROUTINE h5dwrite
!>
!! \ingroup FH5D
!!
!! \brief Reads raw data from a dataset into a buffer (Passes Pointer).
!!
!! \note  \fortran_approved
!!
!! \param dset_id       Identifier of the dataset read from.
!! \param mem_type_id   Identifier of the memory datatype.
!! \param buf           Buffer to receive data read from file.
!! \param hdferr        \fortran_error
!! \param mem_space_id  Identifier of the memory dataspace.
!! \param file_space_id Identifier of dataset&apos;s dataspace in the file. (Default: H5S_ALL_F)
!! \param xfer_prp      Identifier of a transfer property list for this I/O operation.
!!
 SUBROUTINE h5dread_f(dset_id, mem_type_id, buf, hdferr, mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    TYPE(C_PTR), INTENT(INOUT) :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
  END SUBROUTINE h5dread_f

!>
!! \ingroup FH5D
!!
!! \brief There is no direct Fortran90 counterpart for the C function H5Dwrite. Instead, that
!!        functionality is provided by two Fortran90 subroutines:
!!        \li h5dwrite_f Purpose: Writes data other than variable-length data.
!!        \li h5dwrite_vl_f Purpose: Writes variable-length data.
!!
!! \note  \fortran_obsolete
!!
!! \param dset_id       Identifier of the dataset to write to.
!! \param mem_type_id   Identifier of the memory datatype.
!! \param buf           Data buffer; may be a scalar or an array.
!! \param dims          Array to hold corresponding dimension sizes of data buffer buf; dim(k) has value.
!!                      of the k-th dimension of buffer buf; values are ignored if buf is a scalar.
!! \param hdferr        \fortran_error
!! \param mem_space_id  Identifier of the memory dataspace. Default value is H5S_ALL_F.
!! \param file_space_id Identifier of the dataset&apos;s dataspace in the file. Default value is H5S_ALL_F.
!! \param xfer_prp      Identifier of a transfer property list for this I/O operation. Default value is H5P_DEFAULT_F.
!!
  SUBROUTINE h5dwrite_f___F90_VERSION(dset_id, mem_type_id, buf, dims, hdferr, mem_space_id, file_space_id, xfer_prp)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    TYPE(TYPE), INTENT(IN) :: buf
    DIMENSION(*), INTEGER(HSIZE_T), INTENT(IN)  :: dims
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
  END SUBROUTINE h5dwrite_f___F90_VERSION

!>
!! \ingroup FH5D
!!
!! \brief There is no direct Fortran90 counterpart for the C function H5Dread. Instead, that functionality
!!        is provided by two Fortran90 subroutines:
!!        \li h5dread_f    Purpose: Reads data other than variable-length data, uses DIMENSION argument and buf is not a pointer.
!!        \li h5dread_vl_f Purpose: Reads variable-length data.
!!
!! \note  \fortran_obsolete
!!
!! \param dset_id       Identifier of the dataset read from.
!! \param mem_type_id   Identifier of the memory datatype.
!! \param buf           Buffer to receive data read from file, may be a scalar or an array.
!! \param dims          Array to hold corresponding dimension sizes of data buffer buf. dim(k) has value of the k-th.
!!                      dimension of buffer buf. Values are ignored if buf is a scalar.
!! \param hdferr        \fortran_error
!! \param mem_space_id  Identifier of the memory dataspace. (Default: H5S_ALL_F)
!! \param file_space_id Identifier of dataset&apos;s dataspace in the file. (Default: H5S_ALL_F)
!! \param xfer_prp      Identifier of a transfer property list for this I/O operation. (Default: H5P_DEFAULT_F)
!!
  SUBROUTINE h5dread_f___F90_VERSION(dset_id, mem_type_id, buf, dims, hdferr, mem_space_id, file_space_id, xfer_prp)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
    TYPE(TYPE), INTENT(INOUT) :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
  END SUBROUTINE h5dread_f___F90_VERSION

!>
!! \ingroup FH5D
!!
!! \brief Fills dataspace elements with a fill value in a memory buffer.
!!  Only INTEGER, CHARACTER, REAL and DOUBLE PRECISION datatypes of the fillvalues and buffers are supported.
!!  Buffer and fillvalue are assumed to have the same datatype. Only one-dimesional buffers are supported.
!!
!! \param fill_value Fill value.
!! \param space_id   Identifier of the memory datatype.
!! \param buf        Buffer to receive data read from file.
!! \param hdferr     \fortran_error
!!
  SUBROUTINE h5dfill_f(fill_value, space_id, buf,  hdferr)
    TYPE(TYPE), INTENT(IN) :: fill_value
    INTEGER(HID_T), INTENT(IN) :: space_id
    TYPE(TYPE), INTENT(OUT), DIMENSION(*) :: buf
    INTEGER, INTENT(OUT) :: hdferr
  END SUBROUTINE h5dfill_f

#else

  SUBROUTINE h5dwrite_reference_obj(dset_id, mem_type_id, buf, dims, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), DIMENSION(*), INTENT(IN) :: dims
    TYPE(hobj_ref_t_f), DIMENSION(dims(1)), INTENT(IN), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default
    TYPE(C_PTR) :: f_ptr

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF(PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF(PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF(PRESENT(file_space_id)) file_space_id_default = file_space_id
    f_ptr = C_LOC(buf(1))

    hdferr = h5dwrite_f_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, f_ptr)

  END SUBROUTINE h5dwrite_reference_obj

  SUBROUTINE h5dwrite_reference_dsetreg(dset_id, mem_type_id, buf, dims, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), DIMENSION(*), INTENT(IN) :: dims
    TYPE(hdset_reg_ref_t_f), DIMENSION(dims(1)), INTENT(IN), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default
    INTEGER, ALLOCATABLE, DIMENSION(:) :: ref_buf
    INTEGER :: i
    INTEGER(HSIZE_T) :: j
    TYPE(C_PTR) :: f_ptr
    INTERFACE
       INTEGER FUNCTION h5dwrite_ref_reg_c(dset_id, mem_type_id,&
            mem_space_id_default, &
            file_space_id_default, xfer_prp_default, ref_buf, dims) &
            BIND(C,NAME='h5dwrite_ref_reg_c')
         IMPORT :: HID_T, HSIZE_T, SIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(IN) :: mem_type_id
         INTEGER(HID_T) :: xfer_prp_default
         INTEGER(HID_T)  :: mem_space_id_default
         INTEGER(HID_T) :: file_space_id_default
         INTEGER, DIMENSION(*) :: ref_buf
         INTEGER(HSIZE_T), DIMENSION(*) ::  dims
       END FUNCTION h5dwrite_ref_reg_c
    END INTERFACE
    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF(PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF(PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF(PRESENT(file_space_id)) file_space_id_default = file_space_id
    f_ptr = C_LOC(buf(1))

    ALLOCATE(ref_buf(REF_REG_BUF_LEN*dims(1)), stat=hdferr)
    IF (hdferr .NE. 0 ) THEN
       hdferr = -1
       RETURN
    ELSE
       DO j = 1, dims(1)
          DO i = 1, REF_REG_BUF_LEN
             ref_buf(REF_REG_BUF_LEN*(j-1) + i) = buf(j)%ref(i)
          ENDDO
       ENDDO
    ENDIF
    hdferr = h5dwrite_ref_reg_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, ref_buf, dims)
    DEALLOCATE(ref_buf)

  END SUBROUTINE h5dwrite_reference_dsetreg

  SUBROUTINE h5dwrite_char_scalar(dset_id, mem_type_id, buf, dims, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
    CHARACTER(*), INTENT(IN), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    CALL h5dwrite_char_scalar_fix(dset_id, mem_type_id, buf, LEN(buf), dims, hdferr, &
       mem_space_id, file_space_id, xfer_prp)

  END SUBROUTINE h5dwrite_char_scalar

  SUBROUTINE h5dwrite_char_scalar_fix(dset_id, mem_type_id, buf, buf_len, dims, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
    INTEGER, INTENT(IN) :: buf_len
    CHARACTER(LEN=buf_len), INTENT(IN), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default
    TYPE(C_PTR) :: f_ptr

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF(PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF(PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF(PRESENT(file_space_id)) file_space_id_default = file_space_id

    f_ptr = C_LOC(buf(1:1))

    hdferr = h5dwrite_f_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, f_ptr)

  END SUBROUTINE h5dwrite_char_scalar_fix

  SUBROUTINE h5dread_reference_obj(dset_id, mem_type_id, buf, dims, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
    TYPE(hobj_ref_t_f), INTENT(INOUT) , &
         DIMENSION(dims(1)), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default
    TYPE(C_PTR) :: f_ptr

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF(PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF(PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF(PRESENT(file_space_id)) file_space_id_default = file_space_id
    f_ptr = C_LOC(buf(1))

    hdferr = h5dread_f_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, f_ptr)

  END SUBROUTINE h5dread_reference_obj

  SUBROUTINE h5dread_reference_dsetreg(dset_id, mem_type_id, buf, dims, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
    TYPE(hdset_reg_ref_t_f), INTENT(INOUT), &
         DIMENSION(dims(1)), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default

    INTEGER, ALLOCATABLE, DIMENSION(:) :: ref_buf
    INTEGER :: i
    INTEGER(HSIZE_T) :: j
    INTERFACE
       INTEGER FUNCTION h5dread_ref_reg_c(dset_id, mem_type_id,&
            mem_space_id_default, &
            file_space_id_default, xfer_prp_default, ref_buf, dims) &
            BIND(C,NAME='h5dread_ref_reg_c')
         IMPORT :: HID_T, HSIZE_T
         IMPLICIT NONE
         INTEGER(HID_T), INTENT(IN) :: dset_id
         INTEGER(HID_T), INTENT(IN) :: mem_type_id
         INTEGER(HID_T) :: xfer_prp_default
         INTEGER(HID_T)  :: mem_space_id_default
         INTEGER(HID_T) :: file_space_id_default
         INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
         INTEGER, DIMENSION(*) :: ref_buf
       END FUNCTION h5dread_ref_reg_c
    END INTERFACE

    ALLOCATE(ref_buf(REF_REG_BUF_LEN*dims(1)), stat=hdferr)
    IF (hdferr .NE. 0) THEN
       hdferr = -1
       RETURN
    ENDIF

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF(PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF(PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF(PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dread_ref_reg_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, ref_buf, dims)

    DO j = 1, dims(1)
       DO i = 1, REF_REG_BUF_LEN
          buf(j)%ref(i) = ref_buf(REF_REG_BUF_LEN*(j-1) + i)
       ENDDO
    ENDDO
    DEALLOCATE(ref_buf)

  END SUBROUTINE h5dread_reference_dsetreg

  SUBROUTINE h5dread_char_scalar(dset_id, mem_type_id, buf, dims, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims

    CHARACTER(LEN=*), INTENT(INOUT) :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF(PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF(PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF(PRESENT(file_space_id)) file_space_id_default = file_space_id

    CALL h5dread_char_scalar_fix(dset_id, mem_type_id, buf, LEN(buf), hdferr, &
         mem_space_id_default, file_space_id_default, xfer_prp_default)

  END SUBROUTINE h5dread_char_scalar

  SUBROUTINE h5dread_char_scalar_fix(dset_id, mem_type_id, buf, buf_len, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    INTEGER, INTENT(IN)  :: buf_len
    CHARACTER(LEN=buf_len), INTENT(INOUT), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    TYPE(C_PTR) :: f_ptr

    f_ptr = C_LOC(buf(1:1))

    hdferr = h5dread_f_c(dset_id, mem_type_id, mem_space_id, &
         file_space_id, xfer_prp, f_ptr)

  END SUBROUTINE h5dread_char_scalar_fix

  SUBROUTINE h5dwrite_ptr(dset_id, mem_type_id, buf, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    TYPE(C_PTR), INTENT(IN) :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF (PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF (PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF (PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dwrite_f_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, buf)

  END SUBROUTINE h5dwrite_ptr

  SUBROUTINE h5dread_ptr(dset_id, mem_type_id, buf, hdferr, &
       mem_space_id, file_space_id, xfer_prp)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER(HID_T), INTENT(IN) :: dset_id
    INTEGER(HID_T), INTENT(IN) :: mem_type_id
    TYPE(C_PTR), INTENT(INOUT) :: buf
    INTEGER, INTENT(OUT) :: hdferr
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
    INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp

    INTEGER(HID_T) :: xfer_prp_default
    INTEGER(HID_T) :: mem_space_id_default
    INTEGER(HID_T) :: file_space_id_default

    xfer_prp_default = H5P_DEFAULT_F
    mem_space_id_default = H5S_ALL_F
    file_space_id_default = H5S_ALL_F

    IF (PRESENT(xfer_prp)) xfer_prp_default = xfer_prp
    IF (PRESENT(mem_space_id))  mem_space_id_default = mem_space_id
    IF (PRESENT(file_space_id)) file_space_id_default = file_space_id

    hdferr = h5dread_f_c(dset_id, mem_type_id, mem_space_id_default, &
         file_space_id_default, xfer_prp_default, buf)

  END SUBROUTINE h5dread_ptr

  SUBROUTINE h5dfill_integer(fill_value, space_id, buf,  hdferr)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    INTEGER, INTENT(IN), TARGET :: fill_value  ! Fill value
    INTEGER(HID_T), INTENT(IN) :: space_id ! Memory dataspace selection identifier
    INTEGER, INTENT(IN), DIMENSION(*), TARGET :: buf ! Memory buffer to fill in
    INTEGER, INTENT(OUT) :: hdferr      ! Error code

    INTEGER(HID_T) :: fill_type_id ! Fill value datatype identifier
    INTEGER(HID_T) :: mem_type_id  ! Buffer dadtype identifier

    TYPE(C_PTR) :: f_ptr_fill_value ! C pointer to fill_value
    TYPE(C_PTR) :: f_ptr_buf        ! C pointer to buf

    f_ptr_fill_value = C_LOC(fill_value)
    f_ptr_buf = C_LOC(buf(1))

    fill_type_id = H5T_NATIVE_INTEGER
    mem_type_id  = H5T_NATIVE_INTEGER

    hdferr = h5dfill_c(f_ptr_fill_value, fill_type_id, space_id, &
         f_ptr_buf, mem_type_id)

  END SUBROUTINE h5dfill_integer

  SUBROUTINE h5dfill_c_float(fill_valuer, space_id, buf,  hdferr)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    REAL(KIND=C_FLOAT), INTENT(IN), TARGET :: fill_valuer
    INTEGER(HID_T), INTENT(IN) :: space_id
    REAL(KIND=C_FLOAT), INTENT(OUT), DIMENSION(*), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr

    INTEGER(HID_T) :: fill_type_id ! Fill value datatype identifier
    INTEGER(HID_T) :: mem_type_id !  Buffer dadtype identifier

    TYPE(C_PTR) :: f_ptr_fill_valuer ! C pointer to fill_value
    TYPE(C_PTR) :: f_ptr_buf ! C pointer to buf

    f_ptr_fill_valuer = C_LOC(fill_valuer)
    f_ptr_buf = C_LOC(buf(1))

    fill_type_id = H5T_NATIVE_REAL
    mem_type_id  = H5T_NATIVE_REAL

    hdferr = h5dfill_c(f_ptr_fill_valuer, fill_type_id, space_id, &
         f_ptr_buf, mem_type_id)

  END SUBROUTINE h5dfill_c_float

  SUBROUTINE h5dfill_c_double(fill_value, space_id, buf,  hdferr)
    IMPLICIT NONE
    REAL(KIND=C_DOUBLE), INTENT(IN), TARGET :: fill_value
    INTEGER(HID_T), INTENT(IN) :: space_id
    REAL(KIND=C_DOUBLE), INTENT(OUT), DIMENSION(*), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr

    INTEGER(HID_T) :: fill_type_id ! Fill value datatype identifier
    INTEGER(HID_T) :: mem_type_id !  Buffer dadtype identifier

    TYPE(C_PTR) :: f_ptr_fill_valuer ! C pointer to fill_value
    TYPE(C_PTR) :: f_ptr_buf ! C pointer to buf

    f_ptr_fill_valuer = C_LOC(fill_value)
    f_ptr_buf = C_LOC(buf(1))

    fill_type_id = H5T_NATIVE_DOUBLE
    mem_type_id  = H5T_NATIVE_DOUBLE

    hdferr = h5dfill_c(f_ptr_fill_valuer, fill_type_id, space_id, &
         f_ptr_buf, mem_type_id)

  END SUBROUTINE h5dfill_c_double

#if H5_FORTRAN_C_LONG_DOUBLE_IS_UNIQUE!=0
  SUBROUTINE h5dfill_c_long_double(fill_value, space_id, buf,  hdferr)
    IMPLICIT NONE
    REAL(KIND=C_LONG_DOUBLE), INTENT(IN), TARGET :: fill_value
    INTEGER(HID_T), INTENT(IN) :: space_id
    REAL(KIND=C_LONG_DOUBLE), INTENT(OUT), DIMENSION(*), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr

    INTEGER(HID_T) :: fill_type_id ! Fill value datatype identifier
    INTEGER(HID_T) :: mem_type_id !  Buffer dadtype identifier

    TYPE(C_PTR) :: f_ptr_fill_valuer ! C pointer to fill_value
    TYPE(C_PTR) :: f_ptr_buf ! C pointer to buf

    f_ptr_fill_valuer = C_LOC(fill_value)
    f_ptr_buf = C_LOC(buf(1))

    fill_type_id = H5T_NATIVE_DOUBLE
    mem_type_id  = H5T_NATIVE_DOUBLE

    hdferr = h5dfill_c(f_ptr_fill_valuer, fill_type_id, space_id, &
         f_ptr_buf, mem_type_id)

  END SUBROUTINE h5dfill_c_long_double
#endif

  SUBROUTINE h5dfill_char(fill_value, space_id, buf,  hdferr)
    USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR
    IMPLICIT NONE
    CHARACTER, INTENT(IN), TARGET :: fill_value
    INTEGER(HID_T), INTENT(IN) :: space_id
    CHARACTER, INTENT(OUT), DIMENSION(*), TARGET :: buf
    INTEGER, INTENT(OUT) :: hdferr

    INTEGER(HID_T) :: fill_type_id ! Fill value datatype identifier
    INTEGER(HID_T) :: mem_type_id !  Buffer dadtype identifier

    TYPE(C_PTR) :: f_ptr_fill_value ! C pointer to fill_value
    TYPE(C_PTR) :: f_ptr_buf ! C pointer to buf

    f_ptr_fill_value = C_LOC(fill_value)
    f_ptr_buf = C_LOC(buf(1))

    hdferr = h5dfill_c(f_ptr_fill_value, fill_type_id, space_id, &
         f_ptr_buf, mem_type_id)

  END SUBROUTINE h5dfill_char

#endif

END MODULE H5D