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C Copyright 1981-2007 ECMWF
C
C Licensed under the GNU Lesser General Public License which
C incorporates the terms and conditions of version 3 of the GNU
C General Public License.
C See LICENSE and gpl-3.0.txt for details.
C
INTEGER FUNCTION INTFA( INGRIB,INLEN,FLDIN,OUTGRIB,OUTLEN,FLDOUT)
C
C---->
C**** INTFA
C
C Purpose
C -------
C
C Prepare to interpolate input field...
C
C
C Interface
C ---------
C
C IRET = INTFA( INGRIB,INLEN,FLDIN,OUTGRIB,OUTLEN,FLDOUT)
C
C Input
C -----
C
C INGRIB - Input field (packed).
C INLEN - Input field length (words).
C FLDIN - Input field (unpacked).
C
C
C Output
C ------
C
C OUTGRIB - Output field (packed).
C OUTLEN - Output field length (words).
C FLDOUT - Output field (unpacked).
C
C
C Method
C ------
C
C Unpack field if GRIB).
C
C
C Externals
C ---------
C
C IBASINI - Ensure basic interpolation setup is done.
C GRIBEX - Decode/encode GRIB product.
C GRSVCK - Turn off GRIB checking
C RESET_C - Reset interpolation handling options using GRIB product.
C PDDEFS - Setup interpolation using parameter dependent options.
C INTLOG - Log error message.
C
C
C Author
C ------
C
C J.D.Chambers ECMWF Jan 1995
C
C----<
C
IMPLICIT NONE
C
C Function arguments
INTEGER INGRIB(*),OUTGRIB(*),INLEN,OUTLEN
REAL FLDIN(*),FLDOUT(*)
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grfixed.h"
#include "intf.h"
C
C Parameters
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 26100 )
C
C Local variables
C
INTEGER IWORD, IERR
INTEGER KPR
INTEGER LOOP
C
C Externals
INTEGER IBASINI, RESET_C, PDDEFS
C
C ------------------------------------------------------------------
C* Section 1. Initialise
C ------------------------------------------------------------------
C
100 CONTINUE
INTFA = 0
IERR = 0
KPR = 0
C
C Check that basic initialisation has been done
IERR = IBASINI(0)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,'INTFA: basic initialisation fail',JPQUIET)
INTFA = IERR
GOTO 900
ENDIF
C
C ------------------------------------------------------------------
C* Section 2. Decode data from the GRIB code
C ------------------------------------------------------------------
C
200 CONTINUE
C
C Allocate work array ZNFELDI if not already done.
C
IF( IZNJDCI.NE.1952999238 ) THEN
CALL JMEMHAN( 19, IZNFLDI, JPEXPAND, 1, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_WARN,'INTFA: ZNFELDI allocation fail',JPQUIET)
INTFA = IERR
GOTO 900
ENDIF
IZNJDCI = 1952999238
ENDIF
C
C If input is a GRIB product
If (NIFORM .EQ. 1) THEN
C
C Decode data from GRIB code (no checking)
C
IWORD = INLEN
IERR = 0
CALL GRSVCK(0)
IERR = 1
ISEC3(2) = NINT(RMISSGV)
ZSEC3(2) = RMISSGV
CALL GRIBEX(ISEC0, ISEC1, ISEC2, ZSEC2, ISEC3, ZSEC3, ISEC4,
X ZNFELDI, JPEXPAND, INGRIB, INLEN, IWORD, 'D',IERR)
IF ( IERR .NE. 0) THEN
CALL INTLOG(JP_ERROR, 'INTFA: GRIBEX decoding failed.',IERR)
INTFA = IERR
GOTO 900
ENDIF
C
C Setup interpolation options from GRIB product characteristics
IERR = RESET_C( ISEC1, ISEC2, ZSEC2, ISEC4)
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFA: Setup interp. options from GRIB failed.',JPQUIET)
INTFA = IERR
GOTO 900
ENDIF
C
C Otherwise, move unpacked values in from user array
ELSE
DO 210 LOOP = 1, INLEN
ZNFELDI( LOOP ) = FLDIN( LOOP )
210 CONTINUE
C
ENDIF
C
C Setup interpolation options based on parameter in field.
IERR = PDDEFS()
IF ( IERR .NE. 0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTFA: Setup interp. options from parameter failed.',JPQUIET)
INTFA = IERR
GOTO 900
ENDIF
C
C
C ------------------------------------------------------------------
C* Section 9. Closedown.
C ------------------------------------------------------------------
C
900 CONTINUE
C
C Clear change flags for next product processing
C
RETURN
END
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