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C This is part of the netCDF package.
C Copyright 2008 University Corporation for Atmospheric Research/Unidata.
C See COPYRIGHT file for conditions of use.
C This program tests prototype nf_open_mem and procedure for
C creating an in memory netcdf file from an existing netcdf
C file on a hard drive. The program will first use the logic
C from f03tst_vars6.F to create a small netcdf file on
C the hard drive. This file is then opened as a Fortran
C unformatted, stream file and read into an allocatable
C array of C_CHAR type.
program ftst_open_mem
use netcdf4_f03
use iso_c_binding, ONLY : C_CHAR
implicit none
C This is the name of the data file we will create.
character*(*) FILE_NAME
parameter (FILE_NAME='f03tst_open_mem.nc')
integer NDIMS
parameter (NDIMS = 1)
integer DIM_LEN
parameter (DIM_LEN = 22)
integer NVARS
parameter (NVARS = 3)
integer DATA_LEN
parameter (DATA_LEN = 2)
integer check_file
C
C *** Specify an allocatable array of KIND=C_CHAR with TARGET
C attribute to hold in-memory NC file. This is the closest
C we can get to in Fortran >= 2003 to an array of bytes
C that C will understand
Character(KIND=C_CHAR), ALLOCATABLE, TARGET :: memfile(:)
integer ncid, varid(NVARS), dimids(NDIMS)
integer data_len_in, offset, ncsize, iostat, mode
parameter (offset = 20)
integer data1(data_len), data1_in(data_len)
character*(4) var_name(NVARS)
character*(4) dim_name
parameter (dim_name = 'dim1')
integer NO_FILL, MY_FILL_VALUE
parameter (NO_FILL = 1)
parameter (MY_FILL_VALUE = 42)
C Loop index and error handling.
integer x, retval
print *, ''
print *,'*** Testing fill values.'
C Prepare some data to write.
do x = 1, data_len
data1(x) = x
end do
C Set up var names.
var_name(1) = 'var1'
var_name(2) = 'var2'
var_name(3) = 'var3'
C Create the netCDF file.
retval = nf_create(FILE_NAME, NF_NETCDF4, ncid)
if (retval .ne. nf_noerr) call handle_err(retval)
C Create a dimension.
retval = nf_def_dim(ncid, dim_name, DIM_LEN, dimids(1))
if (retval .ne. nf_noerr) call handle_err(retval)
C Create a few integer variables.
do x = 1, NVARS
retval = nf_def_var(ncid, var_name(x), NF_INT, NDIMS, dimids,
$ varid(x))
if (retval .ne. nf_noerr) call handle_err(retval)
end do
C Set no fill mode for the second variable.
retval = nf_def_var_fill(ncid, varid(2), NO_FILL, 88)
if (retval .ne. 0) stop 2
C Set an alternative fill value for the third variable.
retval = nf_def_var_fill(ncid, varid(3), 0, MY_FILL_VALUE)
if (retval .ne. 0) stop 3
C Check it out.
c retval = check_file(ncid, var_name, dim_name)
c if (retval .ne. 0) stop 2
C Close the file.
retval = nf_close(ncid)
if (retval .ne. nf_noerr) call handle_err(retval)
C
C ***** TESTING OF nf_open_mem ******
C
Print *,''
Print *,' testing nf_open_mem'
Print *,''
C
C First open external netcdf file with unformatted stream access
C and get file size (hopefully in bytes) using INQUIRE intrinsic
C
Open(7, FILE=FILE_NAME, STATUS="UNKNOWN", ACCESS="STREAM", &
& FORM="UNFORMATTED")
INQUIRE(FILE=FILE_NAME, SIZE=ncsize)
Print *,''
Print *,' FILE = ', TRIM(FILE_NAME), ' is ', ncsize, ' bytes'
Print *,''
C For non-zero length files ALLOCATED memfile to size returned by INQUIRE
C Then do an unformatted read on file. If no read errors (iostat==0)
C then call nf_open_mem in NF_DISKLESS mode
If (ncsize > 0) Then
ALLOCATE(memfile(ncsize))
Read(7, iostat=iostat) memfile(1:ncsize)
If (iostat == 0) then
Close(7)
mode = IOR(NF_DISKLESS, NF_INMEMORY)
retval = nf_open_mem(FILE_NAME, mode, ncsize, memfile, ncid)
Else
retval = iostat
EndIf
if (retval .ne. 0) stop 41
Else
stop 42
EndIf
retval = check_file(ncid, var_name, dim_name)
if (retval .ne. 0) stop 4
C Close the file.
retval = nf_close(ncid)
if (retval .ne. nf_noerr) call handle_err(retval)
If (ALLOCATED(memfile)) DEALLOCATE(memfile)
print *,'*** SUCCESS!'
end
C This function check the file to make sure everything is OK.
integer function check_file(ncid, var_name, dim_name)
use netcdf4_f03
implicit none
C I need these in both here and the main program.
integer NDIMS
parameter (NDIMS = 1)
integer DIM_LEN
parameter (DIM_LEN = 22)
integer NVARS
parameter (NVARS = 3)
integer DATA_LEN
parameter (DATA_LEN = 2)
integer MY_FILL_VALUE
parameter (MY_FILL_VALUE = 42)
C Parameters
integer ncid
character*(4) var_name(NVARS)
character*(4) dim_name
C Values that are read in, to check the file.
integer ndims_in, nvars_in, ngatts_in, unlimdimid_in
integer xtype_in, dimids_in(NDIMS), natts_in
integer varid_in(NVARS), dimid_in, no_fill_in, fill_value_in
character*(4) var_name_in
integer int_data_in(DIM_LEN)
integer x, retval
C Check it out.
retval = nf_inq(ncid, ndims_in, nvars_in, ngatts_in,
$ unlimdimid_in)
if (retval .ne. nf_noerr) call handle_err(retval)
if (ndims_in .ne. 1 .or. nvars_in .ne. NVARS .or. ngatts_in .ne. 0
$ .or. unlimdimid_in .ne. -1) stop 5
C Get the varids and the dimid.
do x = 1, NVARS
retval = nf_inq_varid(ncid, var_name(x), varid_in(x))
if (retval .ne. nf_noerr) call handle_err(retval)
if (varid_in(x) .ne. x) stop 6
end do
retval = nf_inq_dimid(ncid, dim_name, dimid_in)
if (retval .ne. nf_noerr) call handle_err(retval)
if (dimid_in .ne. 1) stop 7
C These things are the same for all three variables, except
C natts_in..
do x = 1, NVARS
retval = nf_inq_var(ncid, varid_in(x), var_name_in, xtype_in,
$ ndims_in, dimids_in, natts_in)
if (retval .ne. nf_noerr) call handle_err(retval)
if (ndims_in .ne. 1 .or. xtype_in .ne. NF_INT .or. dimids_in(1)
$ .ne. dimid_in) stop 8
if (x .eq. 3 .and. natts_in .ne. 1) stop 9
if (x .lt. 3 .and. natts_in .ne. 0) stop 10
end do
C Check the fill value for the first var. Nothing was set, so
C no_fill should be off, and fill_value should be the default fill
C value for this type.
retval = nf_inq_var_fill(ncid, varid_in(1), no_fill_in,
$ fill_value_in)
if (retval .ne. nf_noerr) call handle_err(retval)
if (no_fill_in .ne. 0 .or. fill_value_in .ne. nf_fill_int) stop 11
C Check that no_fill mode is on for the second variable.
retval = nf_inq_var_fill(ncid, varid_in(2), no_fill_in,
$ fill_value_in)
if (retval .ne. nf_noerr) call handle_err(retval)
if (no_fill_in .ne. 1 .or. fill_value_in .ne. nf_fill_int) stop 12
C Check that a non-default fill value is in use for the third variable.
retval = nf_inq_var_fill(ncid, varid_in(3), no_fill_in,
$ fill_value_in)
if (retval .ne. nf_noerr) call handle_err(retval)
if (no_fill_in .ne. 0 .or. fill_value_in .ne. MY_FILL_VALUE) stop
$ 2
C Get the data in var1. It will be all the default fill value.
retval = nf_get_var_int(ncid, varid_in(1), int_data_in)
if (retval .ne. nf_noerr) call handle_err(retval)
do x = 1, DIM_LEN
if (int_data_in(x) .ne. nf_fill_int) stop 13
end do
C Get the data in var2. What will it be?
retval = nf_get_var_int(ncid, varid_in(2), int_data_in)
if (retval .ne. nf_noerr) call handle_err(retval)
C$$$ do x = 1, DIM_LEN
C$$$ print *, int_data_in(x)
C$$$ end do
C Get the data in var3. It will be all the default fill value.
retval = nf_get_var_int(ncid, varid_in(3), int_data_in)
if (retval .ne. nf_noerr) call handle_err(retval)
do x = 1, DIM_LEN
C print *, int_data_in(x)
if (int_data_in(x) .ne. MY_FILL_VALUE) stop 14
end do
check_file = 0
end
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