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Diffstat (limited to 'HDF5Examples/FORTRAN/H5T/h5ex_t_bitatt_F03.F90')
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1 files changed, 124 insertions, 0 deletions
diff --git a/HDF5Examples/FORTRAN/H5T/h5ex_t_bitatt_F03.F90 b/HDF5Examples/FORTRAN/H5T/h5ex_t_bitatt_F03.F90 new file mode 100644 index 0000000..93b5c1d --- /dev/null +++ b/HDF5Examples/FORTRAN/H5T/h5ex_t_bitatt_F03.F90 @@ -0,0 +1,124 @@ +!************************************************************ +! +! This example shows how to read and write bitfield +! datatypes to an attribute. The program first writes bit +! fields to an attribute 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_bitatt_F03.h5" + CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" + CHARACTER(LEN=2) , PARAMETER :: attribute = "A1" + INTEGER , PARAMETER :: dim0 = 4 + INTEGER , PARAMETER :: dim1 = 7 + + INTEGER(HID_T) :: file, space, dset, attr ! 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 dataset with a null dataspace. + ! + CALL H5Screate_f( H5S_NULL_F, space, hdferr) + CALL h5dcreate_f(file, dataset, H5T_STD_I32LE, space, dset, hdferr) + CALL H5Sclose_f(space, hdferr) + ! + ! Create dataspace. Setting maximum size to be the current size. + ! + CALL h5screate_simple_f(2, dims, space, hdferr) + ! + ! Create the attribute and write the bitfield data to it. + ! + CALL H5Acreate_f(dset, attribute, H5T_STD_B8BE, space, attr, hdferr) + f_ptr = C_LOC(wdata(1,1)) + CALL H5Awrite_f(attr, H5T_NATIVE_B8, f_ptr, hdferr) + ! + ! Close and release resources. + ! + CALL H5Aclose_f(attr, 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, dataset, and attribute. + ! + CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr) + CALL h5dopen_f(file, dataset, dset, hdferr) + CALL h5aopen_f(dset, attribute, attr, hdferr) + ! + ! Get dataspace and allocate memory for read buffer. + ! + CALL H5Aget_space_f(attr, 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 H5Aread_f(attr, H5T_NATIVE_B8, f_ptr, hdferr) + ! + ! Output the data to the screen. + ! + WRITE(*,'(A,":")') attribute + 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 H5Aclose_f(attr, hdferr) + CALL H5Dclose_f(dset, hdferr) + CALL H5Sclose_f(space, hdferr) + CALL H5Fclose_f(file, hdferr) + +END PROGRAM main |