/usr/share/doc/libeccodes-dev/examples/F90/get_set_uuid.f90 is in libeccodes-dev 2.6.0-2.
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!
! This software is licensed under the terms of the Apache Licence Version 2.0
! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
!
! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
!
!
! Description: get/set byte array in a grib2 message, using the uuid as example.
!
! Original authors: Harald Anlauf, Doerte Liermann (DWD), Luis Kornblueh (MPIfM).
!
program get_set_uuid
use eccodes
implicit none
integer :: infile, outfile
integer :: igrib, ogrib
integer :: count1, i, iret, nvg, ffs, length
character(len=1) :: uuid_in (16) ! Array of 16 bytes for uuid on input.
character(len=1) :: uuid_out(16) ! Array of 16 bytes for uuid on output.
character(len=32) :: uuid_string ! Human-readable uuid.
character(len=32) :: uuid_string_expected ! Expected UUID of input
call codes_open_file (infile, '../../data/test_uuid.grib2','r')
call codes_open_file (outfile, 'out_uuid.grib2','w')
! Load first grib message from file
! igrib is the grib id to be used in subsequent calls
call codes_grib_new_from_file (infile, igrib, iret)
uuid_string_expected = '08b1e836bc6911e1951fb51b5624ad8d'
count1 = 0
do while (iret/=CODES_END_OF_FILE)
count1 = count1 + 1
print *, "### Record:", count1
call codes_get(igrib,'typeOfFirstFixedSurface',ffs)
print *, 'typeOfFirstFixedSurface =', ffs
if (ffs /= 150) then
print *, "Unexpected typeOfFirstFixedSurface (must be 150)."
stop
end if
call codes_get (igrib,'numberOfVGridUsed',nvg)
print *, 'numberOfVGridUsed =',nvg
! call codes_get (igrib,'uuidOfVGrid',uuid_in) ! Assuming length is ok.
call codes_get (igrib,'uuidOfVGrid',uuid_in,length=length)
if (length /= 16) then
print *, "Sorry, bad length of byte_array:", length, ". Expected: 16"
stop
end if
! Convert byte array to hexadecimal string for printing
do i = 1, size (uuid_in)
uuid_string(2*i-1:2*i) = byte2hex(uuid_in(i))
end do
print *, "uuidOfVGrid (on input) = ", uuid_string
if (uuid_string .ne. uuid_string_expected) then
print *, "Sorry, bad value of byte_array. Expected: ", uuid_string_expected
stop
end if
call codes_clone (igrib,ogrib)
! On output we write a modified uuid (here the input is simply reversed)
uuid_out(1:16) = uuid_in(16:1:-1)
call codes_set (ogrib,'uuidOfVGrid',uuid_out)
call codes_write (ogrib,outfile)
call codes_release (igrib)
call codes_release (ogrib)
call codes_grib_new_from_file (infile, igrib, iret)
end do
call codes_close_file (infile)
call codes_close_file (outfile)
contains
! Convert single byte to 'hexadecimal' string
pure function byte2hex (c) result (hex)
character(len=1), intent(in) :: c
character(len=2) :: hex
integer :: x
x = iachar (c)
hex(1:1) = nibble ( x / 16)
hex(2:2) = nibble (iand (x, 15))
end function byte2hex
! Convert 'nibble' to 'hexadecimal'
pure function nibble (x)
integer, intent(in) :: x
character :: nibble
select case (x)
case (0:9)
nibble = achar (iachar ('0') + x)
case default
nibble = achar (iachar ('a') - 10 + x)
end select
end function nibble
end program get_set_uuid
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