C----------------------------------------------------------------------- SUBROUTINE GETGB2RP(LUGB,CINDEX,EXTRACT,GRIBM,LENG,IRET) C$$$ SUBPROGRAM DOCUMENTATION BLOCK C C SUBPROGRAM: GETGB2RP EXTRACTS A GRIB MESSAGE FROM A FILE C PRGMMR: GILBERT ORG: W/NMC23 DATE: 2003-12-31 C C ABSTRACT: FIND AND EXTRACTS A GRIB MESSAGE FROM A FILE GIVEN THE C INDEX FOR THE REQUESTED FIELD. C THE GRIB MESSAGE RETURNED CAN CONTAIN ONLY THE REQUESTED FIELD C (EXTRACT=.TRUE.). OR THE COMPLETE GRIB MESSAGE ORIGINALLY CONTAINING C THE DESIRED FIELD CAN BE RETURNED (EXTRACT=.FALSE.) EVEN IF OTHER C FIELDS WERE INCLUDED IN THE GRIB MESSAGE. C IF THE GRIB FIELD IS NOT FOUND, THEN THE RETURN CODE WILL BE NONZERO. C C PROGRAM HISTORY LOG: C 2003-12-31 GILBERT C C USAGE: CALL GETGB2RP(LUGB,CINDEX,EXTRACT,GRIBM,LENG,IRET) C INPUT ARGUMENTS: C LUGB INTEGER UNIT OF THE UNBLOCKED GRIB DATA FILE. C FILE MUST BE OPENED WITH BAOPEN OR BAOPENR BEFORE CALLING C THIS ROUTINE. C CINDEX INDEX RECORD OF THE GRIB FILE ( SEE DOCBLOCK OF C SUBROUTINE IXGB2 FOR DESCRIPTION OF AN INDEX RECORD.) C EXTRACT LOGICAL VALUE INDICATING WHETHER TO RETURN A GRIB2 C MESSAGE WITH JUST THE REQUESTED FIELD, OR THE ENTIRE C GRIB2 MESSAGE CONTAINING THE REQUESTED FIELD. C .TRUE. = RETURN GRIB2 MESSAGE CONTAINING ONLY THE REQUESTED C FIELD. C .FALSE. = RETURN ENTIRE GRIB2 MESSAGE CONTAINING THE C REQUESTED FIELD. C C OUTPUT ARGUMENTS: C GRIBM RETURNED GRIB MESSAGE. C LENG LENGTH OF RETURNED GRIB MESSAGE IN BYTES. C IRET INTEGER RETURN CODE C 0 ALL OK C 97 ERROR READING GRIB FILE C C SUBPROGRAMS CALLED: C BAREAD BYTE-ADDRESSABLE READ C C REMARKS: NONE C C ATTRIBUTES: C LANGUAGE: FORTRAN 90 C C$$$ INTEGER,INTENT(IN) :: LUGB CHARACTER(LEN=1),INTENT(IN) :: CINDEX(*) LOGICAL,INTENT(IN) :: EXTRACT INTEGER,INTENT(OUT) :: LENG,IRET CHARACTER(LEN=1),POINTER,DIMENSION(:) :: GRIBM INTEGER,PARAMETER :: ZERO=0 CHARACTER(LEN=1),ALLOCATABLE,DIMENSION(:) :: CSEC2,CSEC6,CSEC7 CHARACTER(LEN=4) :: Ctemp IRET=0 C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C EXTRACT GRIB MESSAGE FROM FILE IF ( EXTRACT ) THEN LEN0=16 LEN8=4 CALL G2LIB_GBYTE(CINDEX,ISKIP,4*8,4*8) ! BYTES TO SKIP IN FILE CALL G2LIB_GBYTE(CINDEX,ISKP2,8*8,4*8) ! BYTES TO SKIP FOR section 2 if ( iskp2 .gt. 0 ) then CALL BAREAD(LUGB,ISKIP+ISKP2,4,LREAD,ctemp) CALL G2LIB_GBYTE(Ctemp,LEN2,0,4*8) ! LENGTH OF SECTION 2 ALLOCATE(csec2(len2)) CALL BAREAD(LUGB,ISKIP+ISKP2,LEN2,LREAD,csec2) else LEN2=0 endif CALL G2LIB_GBYTE(CINDEX,LEN1,44*8,4*8) ! LENGTH OF SECTION 1 IPOS=44+LEN1 CALL G2LIB_GBYTE(CINDEX,LEN3,IPOS*8,4*8) ! LENGTH OF SECTION 3 IPOS=IPOS+LEN3 CALL G2LIB_GBYTE(CINDEX,LEN4,IPOS*8,4*8) ! LENGTH OF SECTION 4 IPOS=IPOS+LEN4 CALL G2LIB_GBYTE(CINDEX,LEN5,IPOS*8,4*8) ! LENGTH OF SECTION 5 IPOS=IPOS+LEN5 CALL G2LIB_GBYTE(CINDEX,LEN6,IPOS*8,4*8) ! LENGTH OF SECTION 6 IPOS=IPOS+5 CALL G2LIB_GBYTE(CINDEX,IBMAP,IPOS*8,1*8) ! Bitmap indicator IF ( IBMAP .eq. 254 ) THEN CALL G2LIB_GBYTE(CINDEX,ISKP6,24*8,4*8) ! BYTES TO SKIP FOR section 6 CALL BAREAD(LUGB,ISKIP+ISKP6,4,LREAD,ctemp) CALL G2LIB_GBYTE(Ctemp,LEN6,0,4*8) ! LENGTH OF SECTION 6 ENDIF ! ! READ IN SECTION 7 from file ! CALL G2LIB_GBYTE(CINDEX,ISKP7,28*8,4*8) ! BYTES TO SKIP FOR section 7 CALL BAREAD(LUGB,ISKIP+ISKP7,4,LREAD,ctemp) CALL G2LIB_GBYTE(Ctemp,LEN7,0,4*8) ! LENGTH OF SECTION 7 ALLOCATE(csec7(len7)) CALL BAREAD(LUGB,ISKIP+ISKP7,LEN7,LREAD,csec7) LENG=LEN0+LEN1+LEN2+LEN3+LEN4+LEN5+LEN6+LEN7+LEN8 IF (.NOT. ASSOCIATED(GRIBM)) ALLOCATE(GRIBM(LENG)) ! Create Section 0 ! GRIBM(1)='G' GRIBM(2)='R' GRIBM(3)='I' GRIBM(4)='B' GRIBM(5)=CHAR(0) GRIBM(6)=CHAR(0) GRIBM(7)=CINDEX(42) GRIBM(8)=CINDEX(41) GRIBM(9)=CHAR(0) GRIBM(10)=CHAR(0) GRIBM(11)=CHAR(0) GRIBM(12)=CHAR(0) CALL G2LIB_SBYTE(GRIBM,LENG,12*8,4*8) ! ! Copy Section 1 ! GRIBM(17:16+LEN1)=CINDEX(45:44+LEN1) lencur=16+LEN1 ipos=44+len1 ! ! Copy Section 2, if necessary ! if ( iskp2 .gt. 0 ) then GRIBM(lencur+1:lencur+LEN2)=csec2(1:LEN2) lencur=lencur+LEN2 endif ! ! Copy Sections 3 through 5 ! GRIBM(lencur+1:lencur+LEN3+LEN4+LEN5)= & CINDEX(ipos+1:ipos+LEN3+LEN4+LEN5) lencur=lencur+LEN3+LEN4+LEN5 ipos=ipos+LEN3+LEN4+LEN5 ! ! Copy Section 6 ! if ( LEN6 .eq. 6 .AND. IBMAP .ne. 254 ) then GRIBM(lencur+1:lencur+LEN6)=CINDEX(ipos+1:ipos+LEN6) lencur=lencur+LEN6 else CALL G2LIB_GBYTE(CINDEX,ISKP6,24*8,4*8) ! BYTES TO SKIP FOR section 6 CALL BAREAD(LUGB,ISKIP+ISKP6,4,LREAD,ctemp) CALL G2LIB_GBYTE(Ctemp,LEN6,0,4*8) ! LENGTH OF SECTION 6 ALLOCATE(csec6(len6)) CALL BAREAD(LUGB,ISKIP+ISKP6,LEN6,LREAD,csec6) GRIBM(lencur+1:lencur+LEN6)=csec6(1:LEN6) lencur=lencur+LEN6 IF ( allocated(csec6)) DEALLOCATE(csec6) endif ! ! Copy Section 7 ! GRIBM(lencur+1:lencur+LEN7)=csec7(1:LEN7) lencur=lencur+LEN7 ! ! Section 8 ! GRIBM(lencur+1)='7' GRIBM(lencur+2)='7' GRIBM(lencur+3)='7' GRIBM(lencur+4)='7' ! clean up ! IF ( allocated(csec2)) DEALLOCATE(csec2) IF ( allocated(csec7)) deallocate(csec7) ELSE ! DO NOT extract field from message : Get entire message CALL G2LIB_GBYTE(CINDEX,ISKIP,4*8,4*8) ! BYTES TO SKIP IN FILE CALL G2LIB_GBYTE(CINDEX,LENG,36*8,4*8) ! LENGTH OF GRIB MESSAGE IF (.NOT. ASSOCIATED(GRIBM)) ALLOCATE(GRIBM(LENG)) CALL BAREAD(LUGB,ISKIP,LENG,LREAD,GRIBM) IF ( LENG .NE. LREAD ) THEN DEALLOCATE(GRIBM) NULLIFY(GRIBM) IRET=97 RETURN ENDIF ENDIF C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - RETURN END