Expose more of the new file-based API in Fortran

src/g2c_interface.F90

@@ -23,7 +23,25 @@ function g2c_open_index(data_file, index_file, mode, g2cid) bind(c)
        integer(c_int) :: g2c_open_index
      end function g2c_open_index
 
-     ! int g2c_inq(int g2cid, int *num_msg);
+     function g2c_inq(g2id, num_msg) bind(c)
+       use iso_c_binding
+       integer(c_int), value :: g2id
+       integer(c_int), intent(out) :: num_msg
+       integer(c_int) :: g2c_inq
+     end function g2c_inq
+
+     function g2c_inq_msg(g2id, msg_num, discipline, num_fields, &
+          num_local, center, subcenter, master_version, local_version) bind(c)
+       use iso_c_binding
+       integer(c_int), value :: g2id
+       integer(c_int), value :: msg_num
+       integer(c_signed_char), intent(out) :: discipline
+       integer(c_int), intent(out) :: num_fields, num_local
+       integer(c_short), intent(out) :: center, subcenter
+       integer(c_signed_char), intent(out) :: master_version, local_version
+       integer(c_int) :: g2c_inq_msg
+     end function g2c_inq_msg
+
      ! int g2c_inq_msg(int g2cid, int msg_num, unsigned char *discipline, int *num_fields,
      !    int *num_local, short *center, short *subcenter, unsigned char *master_version,
      !    unsigned char *local_version);
@@ -32,6 +50,7 @@ function g2c_close(g2id) bind(c)
        integer(c_int), value :: g2id
        integer(c_int) :: g2c_close
      end function g2c_close
+
      function g2c_set_log_level(log_level) bind(c)
        use iso_c_binding
        integer(c_int), intent(in) :: log_level

src/g2cf.F90

@@ -132,6 +132,81 @@ function g2cf_open_index(data_file, index_file, mode, g2cid) result (status)
     status = cstatus
   end function g2cf_open_index
 
+  !> Learn how many messages are in a GRIB2 file.
+  !>
+  !> @param g2id The ID of the open file
+  !> @param num_msg The number of messages in the file.
+  !>
+  !> @return 0 for success, error code otherwise.
+  !>
+  !> @author Edward Hartnett @date 2024-12-21
+  function g2cf_inq(g2id, num_msg) result(status)
+    use iso_c_binding    
+    use g2c_interface
+    implicit none
+
+    integer, intent(in) :: g2id
+    integer, intent(out) :: num_msg    
+    integer :: status
+
+    integer(c_int) :: cg2id, cnum_msg, cstatus
+
+    cg2id = g2id
+    cstatus = g2c_inq(cg2id, cnum_msg)
+    num_msg = cnum_msg
+    status = cstatus
+  end function g2cf_inq
+
+  !> Learn about a message are in a GRIB2 file.
+  !>
+  !> @param[in] g2id The ID of the open file
+  !> @param[in] msg_num The number of message to learn about. The
+  !> first message in the file is number 1.
+  !> @param[out] discipline The discipline of the message.
+  !> @param[out] num_fields Number of fields in the message.
+  !> @param[out] num_local Number of local sections in the message.
+  !> @param[out] center Originating center.
+  !> @param[out] subcenter Originating sub-center.
+  !> @param[out] master_version Master version.
+  !> @param[out] local_version Local version.
+  !>
+  !> @return 0 for success, error code otherwise.
+  !>
+  !> @author Edward Hartnett @date 2024-12-21
+  function g2cf_inq_msg(g2id, msg_num, discipline, num_fields, &
+          num_local, center, subcenter, master_version, local_version) result(status)
+    use iso_c_binding    
+    use g2c_interface
+    implicit none
+
+    integer, intent(in) :: g2id, msg_num
+    integer(kind = 1), intent(out) :: discipline
+    integer, intent(out) :: num_fields, num_local
+    integer(kind = 2), intent(out) :: center, subcenter
+    integer(kind = 1), intent(out) :: master_version, local_version
+    integer :: status
+
+    integer(c_int) :: cg2id, cmsg_num, cstatus
+    integer(c_signed_char) :: cdiscipline
+    integer(c_int) :: cnum_fields, cnum_local
+    integer(c_short) :: ccenter, csubcenter
+    integer(c_signed_char) :: cmaster_version, clocal_version
+
+    cg2id = g2id
+    ! Subtract 1 because C is zero-based.
+    cmsg_num = msg_num - 1 
+    cstatus = g2c_inq_msg(cg2id, cmsg_num, cdiscipline, cnum_fields, &
+         cnum_local, ccenter, csubcenter, cmaster_version, clocal_version)
+    discipline = cdiscipline
+    num_fields = cnum_fields
+    num_local = cnum_local
+    center = ccenter
+    subcenter = csubcenter
+    master_version = cmaster_version
+    local_version = clocal_version
+    status = cstatus
+  end function g2cf_inq_msg
+
   !> Close a GRIB2 file.
   !>
   !> @param g2id The ID of the open file

tests/test_g2cf.F90

@@ -15,22 +15,24 @@ program test_g2cf
   integer :: ierr
 
   print *, 'Testing g2cf API...'
-  ierr = g2cf_set_log_level(1)
+  !ierr = g2cf_set_log_level(1)
 
   ! Open the test file.
   ierr = g2cf_open(fileName, 0, g2cid)
   if (ierr .ne. 0) stop 2
 
-  ! ! Check number of messages.
-  ! ierr = g2cf_inq(g2cid, num_msg)
-  ! if (ierr .ne. 0) stop 10
-  ! if (num_msg .ne. 19) stop 11
+  ! Check number of messages.
+  ierr = g2cf_inq(g2cid, num_msg)
+  if (ierr .ne. 0) stop 10
+  if (num_msg .ne. 19) stop 11
 
-  ! ! Check the last message.
-  ! ierr = g2cf_inq_msg(g2cid, 19, discipline, num_fields, num_local, center, subcenter, &
-  !      master_version, local_version)
-  ! if (discipline .ne. 10 .or. num_fields .ne. 1 .or. num_local .ne. 0 .or. center .ne. 7 .or. &
-  !      subcenter .ne. 0 .or. master_version .ne. 2 .or. local_version .ne. 1) stop 12
+  ! Check the last message.
+  ierr = g2cf_inq_msg(g2cid, 19, discipline, num_fields, num_local, center, subcenter, &
+       master_version, local_version)
+  if (ierr .ne. 0) stop 100
+  !print *, discipline, num_fields, num_local, center, subcenter, master_version, local_version
+  if (discipline .ne. 10 .or. num_fields .ne. 1 .or. num_local .ne. 0 .or. center .ne. 7 .or. &
+       subcenter .ne. 0 .or. master_version .ne. 2 .or. local_version .ne. 1) stop 12
 
   ! Close the file.
   ierr = g2cf_close(g2cid)