mirror of https://github.com/ecmwf/eccodes.git
104 lines
3.4 KiB
Fortran
104 lines
3.4 KiB
Fortran
! (C) Copyright 2005- ECMWF.
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!
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! This software is licensed under the terms of the Apache Licence Version 2.0
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! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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!
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! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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!
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! Get message lengths using two different interfaces
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! See GRIB-292
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!
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program grib_read_from_file_example
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use eccodes
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implicit none
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character(len=32) :: input_grib_file
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integer, dimension(26) :: message_lengths ! expected message lengths
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input_grib_file = '../../data/v.grib2'
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message_lengths = (/95917, 96963, 97308, 97386, 97215, 97440, 98451, 98629, 98448, &
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99186, 97517, 97466, 99307, 98460, 101491, 99361, 100292, 96838, &
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91093, 83247, 78244, 74872, 72663, 69305, 69881, 68572/)
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! get the GRIB message length using two different interfaces
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call read_using_size_t()
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call read_using_integer()
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print *, 'Passed'
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contains
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!======================================
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subroutine read_using_size_t
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implicit none
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integer :: size, intsize
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parameter(intsize=100000, size=intsize*4)
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integer :: ifile
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integer :: iret
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integer :: count1 = 0
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integer(kind=4), dimension(intsize) :: buffer
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integer(kind=kindOfSize_t) :: len1 ! For large messages
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character(len=128) :: error_message
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ifile = 5
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call codes_open_file(ifile, input_grib_file, 'r')
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len1 = size
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do while (.true.)
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call codes_read_from_file(ifile, buffer, len1, iret)
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if (iret /= CODES_SUCCESS) exit
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count1 = count1 + 1
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if (len1 /= message_lengths(count1)) then
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write (*, '(a,i3,a,i8,a,i8)') 'Error: Message #', count1, ' length=', len1, '. Expected=', message_lengths(count1)
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stop
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end if
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len1 = size
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end do
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if (iret /= CODES_END_OF_FILE) then
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call codes_get_error_string(iret, error_message)
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write (*, *) 'error message: ', error_message
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call codes_check(iret, 'grib_read_from_file', '')
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end if
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call codes_close_file(ifile)
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end subroutine read_using_size_t
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!======================================
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subroutine read_using_integer
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implicit none
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integer :: size, intsize
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parameter(intsize=100000, size=intsize*4)
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integer :: ifile
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integer :: iret
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integer :: count1 = 0
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integer(kind=4), dimension(intsize) :: buffer
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integer :: len1
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character(len=128) :: error_message
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ifile = 5
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call codes_open_file(ifile, input_grib_file, 'r')
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len1 = size
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call codes_read_from_file(ifile, buffer, len1, iret)
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do while (iret == CODES_SUCCESS)
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count1 = count1 + 1
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if (len1 /= message_lengths(count1)) then
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write (*, '(a,i3,a,i8,a,i8)') 'Error: Message #', count1, ' length=', len1, '. Expected=', message_lengths(count1)
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stop
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end if
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len1 = size
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call codes_read_from_file(ifile, buffer, len1, iret)
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end do
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if (iret /= CODES_END_OF_FILE) then
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call codes_get_error_string(iret, error_message)
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write (*, *) 'error message: ', error_message
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call codes_check(iret, 'grib_read_from_file', '')
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end if
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call codes_close_file(ifile)
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end subroutine read_using_integer
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!======================================
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end program
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