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! ************************************************************
!
! This example shows how to read and write data to a dataset
! using the N-Bit filter. The program first checks if the
! N-Bit filter is available, then if it is it writes
! integers to a dataset using N-Bit, then closes the file.
! Next, it reopens the file, reads back the data, and
! outputs the type of filter and the maximum value in the
! dataset to the screen.
!
! This file is intended for use with HDF5 Library version 1.8
!
! ************************************************************
PROGRAM main
USE HDF5
IMPLICIT NONE
CHARACTER(LEN=14), PARAMETER :: filename = "h5ex_d_nbit.h5"
CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1"
INTEGER , PARAMETER :: dim0 = 32
INTEGER , PARAMETER :: dim1 = 64
INTEGER , PARAMETER :: chunk0 = 4
INTEGER , PARAMETER :: chunk1 = 8
INTEGER :: hdferr
INTEGER(HID_T) :: file, space, dset, dtype, dcpl ! Handles
INTEGER(SIZE_T) :: nelmts = 50
INTEGER, DIMENSION(1:50) :: cd_values
INTEGER(HSIZE_T), DIMENSION(1:2) :: dims = (/dim0, dim1/), chunk = (/chunk0,chunk1/)
INTEGER(HSIZE_T), DIMENSION(1:2) :: start, stride, count, block
LOGICAL :: avail
INTEGER :: filter_id
INTEGER :: filter_info_both
INTEGER :: flags, filter_info
INTEGER, DIMENSION(1:dim0, 1:dim1) :: wdata, & ! Write buffer
rdata ! Read buffer
INTEGER :: max, i, j
INTEGER, PARAMETER :: MaxChrLen = 80
CHARACTER(LEN=MaxChrLen) :: name
!
! Initialize FORTRAN interface.
!
CALL h5open_f(hdferr)
! Check if N-Bit compression is available and can be used for both
! compression and decompression. Normally we do not perform error
! checking in these examples for the sake of clarity, but in this
! case we will make an exception because this filter is an
! optional part of the hdf5 library.
!
CALL h5zfilter_avail_f(H5Z_FILTER_NBIT_F, avail, hdferr)
IF (.NOT.avail) THEN
WRITE(*,'("N-Bit filter not available.",/)')
STOP 1
ENDIF
CALL h5zget_filter_info_f(H5Z_FILTER_NBIT_F, filter_info, hdferr)
filter_info_both=IOR(H5Z_FILTER_ENCODE_ENABLED_F,H5Z_FILTER_DECODE_ENABLED_F)
IF (filter_info .NE. filter_info_both) THEN
WRITE(*,'("N-Bit filter not available for encoding and decoding.",/)')
STOP 1
ENDIF
! Initialize data.
DO i = 1, dim0
DO j = 1, dim1
wdata(i,j) = (i-1)*(j-1)-(j-1)
ENDDO
ENDDO
!
! Create a new file using the default properties.
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr)
!
! Create dataspace. Setting size to be the current size.
!
CALL h5screate_simple_f(2, dims, space, hdferr)
!
! Create the datatype to use with the N-Bit filter. It has an
! uncompressed size of 32 bits, but will have a size of 16 bits
! after being packed by the N-Bit filter.
!
CALL h5tcopy_f (H5T_STD_I32LE, dtype, hdferr)
CALL h5tset_precision_f (dtype, INT(16,SIZE_T), hdferr)
CALL h5tset_offset_f (dtype, INT(5,SIZE_T), hdferr)
!
! Create the dataset creation property list, add the N-Bit filter
! and set the chunk size.
!
CALL h5pcreate_f(H5P_DATASET_CREATE_F, dcpl, hdferr)
CALL h5pset_nbit_f(dcpl, hdferr)
CALL h5pset_chunk_f(dcpl, 2, chunk, hdferr)
!
! Create the dataset.
!
CALL h5dcreate_f(file, dataset, dtype, space, dset, hdferr, dcpl)
!
! Write the data to the dataset.
!
CALL h5dwrite_f(dset, H5T_NATIVE_INTEGER, wdata, dims, hdferr)
!
! Close and release resources.
!
CALL h5pclose_f(dcpl , hdferr)
CALL h5tclose_f(dtype, 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 and dataset using the default properties.
!
CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr)
CALL h5dopen_f (file, dataset, dset, hdferr)
!
! Retrieve dataset creation property list.
!
CALL h5dget_create_plist_f(dset, dcpl, hdferr)
!
! Retrieve and print the filter type. Here we only retrieve the
! first filter because we know that we only added one filter.
!
CALL H5Pget_filter_f(dcpl, 0, flags, nelmts, cd_values, INT(MaxChrLen, SIZE_T), name, filter_id, hdferr)
WRITE(*,'("Filter type is: ")', ADVANCE='NO')
IF(filter_id.EQ.H5Z_FILTER_DEFLATE_F)THEN
WRITE(*,'(T2,"H5Z_FILTER_DEFLATE_F")')
ELSE IF(filter_id.EQ.H5Z_FILTER_SHUFFLE_F)THEN
WRITE(*,'(T2,"H5Z_FILTER_SHUFFLE_F")')
ELSE IF(filter_id.EQ.H5Z_FILTER_FLETCHER32_F)THEN
WRITE(*,'(T2,"H5Z_FILTER_FLETCHER32_F")')
ELSE IF(filter_id.EQ.H5Z_FILTER_SZIP_F)THEN
WRITE(*,'(T2,"H5Z_FILTER_SZIP_F")')
ELSE IF(filter_id.EQ.H5Z_FILTER_NBIT_F)THEN
WRITE(*,'(T2,"H5Z_FILTER_NBIT_F")')
ENDIF
!
! Read the data using the default properties.
!
CALL h5dread_f(dset, H5T_NATIVE_INTEGER, rdata, dims, hdferr)
!
! Find the maximum value in the dataset, to verify that it was
! read correctly.
!
max = MAXVAL(rdata)
!
! Print the maximum value.
!
WRITE(*,'("Maximum value in ",A," is: ",i10)') dataset, max
!
! Close and release resources.
!
CALL h5pclose_f(dcpl , hdferr)
CALL h5dclose_f(dset , hdferr)
CALL h5fclose_f(file , hdferr)
END PROGRAM main
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