Add large file test for getgb2i2() (#647)

* changed default index version back to 1

* adding getgb2i2()

* adding getgb2i2()

* fixed dox

* more testing

* more testing

* more testing

* more testing

* adding large file test

* more test development

* testing last message

tests/CMakeLists.txt

@@ -132,6 +132,7 @@ if(FTP_TEST_FILES)
     if(FTP_LARGE_TEST_FILES)    
       create_test(test_fv3 ${kind})
       create_test(test_create_index_fv3 ${kind})
+      create_test(test_files_fv3 ${kind})
     endif()
     if(FTP_EXTRA_TEST_FILES)    
       create_test(test_create_index_gfsprs ${kind})

tests/test_files_fv3.F90

@@ -0,0 +1,81 @@
+! This is a test program for NCEPLIBS-g2.
+!
+! This program tests reading the very large FV3 GRIB2 file, using
+! getgb2i2().
+!
+! Ed Hartnett 3/20/24
+program test_files_fv3
+  use grib_mod
+  implicit none
+
+  integer :: lugb = 10
+  integer :: jdisc = -1, jpdtn = -1, jgdtn = -1, jskp = 0
+  integer, dimension(200) :: jids, jpdt, jgdt
+  logical :: unpack = .true.
+  type(gribfield) :: gfld
+  integer :: expected_idsect(13) = (/ 7, 0, 2, 1, 1, 2022, 6, 21, 0, 0, 0, 0, 1 /)
+  integer :: expected_igdtmpl(22) = (/ 6, 0, 0, 0, 0, 0, 0, 4881, 2961, 0, 0, -37000000, &
+       299000000, 48, 37000000, 61000000, 25000, 25000, 64, -35000000, 247000000, 0 /)
+  integer :: expected_ipdtmpl(15) = (/ 3, 0, 2, 0, 134, 0, 0, 1, 0, 1, 0, 0, 255, 0, 0 /)
+  integer :: expected_idrtmpl(18) = (/ 1216637952, 0, 3, 17, 0, 1, 0, 0, 0, 560759, 0, &
+       5, 1, 1, 63, 6, 2, 3 /)
+  integer :: i, idxver, iret, k
+
+  print *, 'Testing reading GRIB2 file fv3lam.t00z.prslev.f000.grib2...'
+
+  idxver = 2
+  ! Open the file.
+  call baopenr(lugb, 'data/fv3lam.t00z.prslev.f000.grib2', iret)
+  if (iret .ne. 0) stop 2
+
+  ! Find the last message in the file.
+  jids = -9999
+  jpdt = -9999
+  jgdt = -9999
+  jskp = 1080 ! skip to the last message
+  call getgb2i2(lugb, 0, jskp, jdisc, jids, jpdtn, jpdt, jgdtn, jgdt,  &
+       unpack, idxver, k, gfld, iret)
+  if (iret .ne. 0) stop 3
+  ! Make sure we found message 1081 in the file.
+  if (k .ne. 1081) stop 4
+  if (gfld%version .ne. 2 .or. gfld%discipline .ne. 10 .or. gfld%idsectlen .ne. 13 .or. &
+       gfld%locallen .ne. 0 .or. gfld%ifldnum .ne. 1 .or. gfld%griddef .ne. 0 .or. &
+       gfld%ngrdpts .ne. 14452641 .or. gfld%numoct_opt .ne. 0 .or. gfld%interp_opt .ne. 0 .or. &
+       gfld%num_opt .ne. 0 .or. gfld%igdtnum .ne. 1 .or. gfld%ipdtnum .ne. 0 .or. &
+       gfld%ipdtlen .ne. 15 .or. gfld%ndpts .ne. 8793914 .or. gfld%idrtnum .ne. 3 .or. &
+       gfld%idrtlen .ne. 18 .or. gfld%unpacked .neqv. .false. .or. gfld%expanded .neqv. .true. .or. &
+       gfld%ibmap .ne. 0) stop 10
+  do i = 1, 13
+     if (gfld%idsect(i) .ne. expected_idsect(i)) stop 20
+  end do
+  do i = 1, 22
+     if (gfld%igdtmpl(i) .ne. expected_igdtmpl(i)) stop 30
+  end do
+  do i = 1, 15
+     if (gfld%ipdtmpl(i) .ne. expected_ipdtmpl(i)) then
+        print *, 'got gfld%ipdtmpl', gfld%ipdtmpl
+        print *, 'expected ', expected_ipdtmpl
+        stop 40
+     endif
+  end do
+  do i = 1, 18
+     if (gfld%idrtmpl(i) .ne. expected_idrtmpl(i)) stop 50
+  end do
+  ! do i = 1, 100
+  !    print *, gfld%fld(1)
+  ! end do
+
+  ! Close the file.
+  call baclose(lugb, iret)  
+  if (iret .ne. 0) stop 200
+
+  ! Free memory.
+  call gf_free(gfld)
+
+  ! Free internal library memory.
+  call gf_finalize(iret)
+  if (iret .ne. 0) stop 5
+
+  print *, 'OK!'
+  print *, 'SUCCESS!'
+end program test_files_fv3