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!************************************************************
!
! This example shows how to read and write bitfield
! datatypes to a dataset. The program first writes bit
! fields to a dataset with a dataspace of DIM0xDIM1, then
! closes the file. Next, it reopens the file, reads back
! the data, and outputs it to the screen.
!
! This file is intended for use with HDF5 Library version 1.8
! with --enable-fortran2003
!
!************************************************************
PROGRAM main
USE HDF5
USE ISO_C_BINDING
IMPLICIT NONE
CHARACTER(LEN=20), PARAMETER :: filename = "h5ex_t_bit_F03.h5"
CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1"
INTEGER , PARAMETER :: dim0 = 4
INTEGER , PARAMETER :: dim1 = 7
INTEGER(HID_T) :: file, space, dset ! Handles
INTEGER :: hdferr
INTEGER(HSIZE_T), DIMENSION(1:2) :: dims = (/dim0, dim1/)
INTEGER(HSIZE_T), DIMENSION(1:2) :: maxdims
INTEGER(C_SIGNED_CHAR), DIMENSION(1:dim0, 1:dim1), TARGET :: wdata ! Write buffer
INTEGER(C_SIGNED_CHAR), DIMENSION(:,:), ALLOCATABLE, TARGET :: rdata ! Read buffer
INTEGER :: A, B, C, D
INTEGER(C_SIGNED_CHAR) :: i, j
INTEGER(C_SIGNED_CHAR) :: hex
TYPE(C_PTR) :: f_ptr
DATA hex /Z'03'/
!
! Initialize FORTRAN interface.
!
CALL h5open_f(hdferr)
!
! Initialize data. We will manually pack 4 2-bit integers into
! each unsigned char data element.
!
DO i = 0, dim0-1
DO j = 0, dim1-1
wdata(i+1,j+1) = 0
wdata(i+1,j+1) = IOR( wdata(i+1,j+1), IAND(i * j - j, hex)) ! Field "A"
wdata(i+1,j+1) = IOR( wdata(i+1,j+1), ISHFT(IAND(i,hex),2)) ! Field "B"
wdata(i+1,j+1) = IOR( wdata(i+1,j+1), ISHFT(IAND(j,hex),4)) ! Field "C"
wdata(i+1,j+1) = IOR( wdata(i+1,j+1), ISHFT(IAND(i+j,hex),6)) ! Field "D"
ENDDO
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 and write the bitfield data to it.
!
CALL H5Dcreate_f(file, dataset, H5T_STD_B8BE, space, dset, hdferr)
f_ptr = C_LOC(wdata(1,1))
CALL H5Dwrite_f(dset, H5T_NATIVE_B8, f_ptr, hdferr)
!
! Close and release resources.
!
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, dataset.
!
CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr)
CALL h5dopen_f(file, dataset, dset, hdferr)
!
! Get dataspace and allocate memory for read buffer.
!
CALL H5Dget_space_f(dset, space, hdferr)
CALL H5Sget_simple_extent_dims_f(space, dims, maxdims, hdferr)
ALLOCATE(rdata(1:dims(1),1:dims(2)))
!
! Read the data.
!
f_ptr = C_LOC(rdata)
CALL H5Dread_f(dset, H5T_NATIVE_B8, f_ptr, hdferr)
!
! Output the data to the screen.
!
WRITE(*,'(A,":")') dataset
DO i = 1, dims(1)
WRITE(*,'(" [ ")', ADVANCE='NO')
DO j = 1, dims(2)
A = IAND(rdata(i,j), hex) ! Retrieve field "A"
B = IAND(ISHFT(rdata(i,j),-2), hex) ! Retrieve field "B"
C = IAND(ISHFT(rdata(i,j),-4), hex) ! Retrieve field "C"
D = IAND(ISHFT(rdata(i,j),-6), hex) ! Retrieve field "D"
WRITE(*,'(A1,4I2,A2)', ADVANCE='NO') "{",A, B, C, D,"} "
ENDDO
WRITE(*,'(A1)') "]"
ENDDO
!
! Close and release resources.
!
DEALLOCATE(rdata)
CALL H5Dclose_f(dset, hdferr)
CALL H5Sclose_f(space, hdferr)
CALL H5Fclose_f(file, hdferr)
END PROGRAM main
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