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182 lines (180 loc) · 5.37 KB
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!----------------------------------------------------------------------!
! functions for packing/unpacking data !
!----------------------------------------------------------------------!
CHARACTER(4) FUNCTION PACKI4(LSWAP,IN4)
IMPLICIT NONE
INTEGER*4, INTENT(IN) :: IN4
LOGICAL*4, INTENT(IN) :: LSWAP
CHARACTER(4) C4
INTEGER*4 I,I4
EQUIVALENCE(C4,I4)
I4 = IN4
IF (LSWAP) THEN
DO 1 I=1,4
PACKI4(I:I) = C4(5-I:5-I)
1 CONTINUE
ELSE
DO 2 I=1,4
PACKI4(I:I) = C4(I:I)
2 CONTINUE
ENDIF
RETURN
END
! !
!======================================================================!
! !
CHARACTER(4) FUNCTION PACKR4(LSWAP,RIN4)
IMPLICIT NONE
REAL*4, INTENT(IN) :: RIN4
LOGICAL*4, INTENT(IN) :: LSWAP
CHARACTER(4) C4
REAL*4 R4
INTEGER*4 I
EQUIVALENCE(C4,R4)
R4 = RIN4
IF (LSWAP) THEN
DO 1 I=1,4
PACKR4(I:I) = C4(5-I:5-I)
1 CONTINUE
ELSE
DO 2 I=1,4
PACKR4(I:I) = C4(I:I)
2 CONTINUE
ENDIF
RETURN
END
! !
!======================================================================!
! !
CHARACTER(8) FUNCTION PACKR8(LSWAP,RIN8)
IMPLICIT NONE
REAL*8, INTENT(IN) :: RIN8
LOGICAL*4, INTENT(IN) :: LSWAP
CHARACTER(8) C8
REAL*8 R8
INTEGER*4 I
EQUIVALENCE(C8,R8)
R8 = RIN8
IF (LSWAP) THEN
DO 1 I=1,8
PACKR8(I:I) = C8(9-I:9-I)
1 CONTINUE
ELSE
DO 2 I=1,8
PACKR8(I:I) = C8(I:I)
2 CONTINUE
ENDIF
RETURN
END
! !
!======================================================================!
! !
INTEGER*4 FUNCTION UNPACKI4(LSWAP,CIN4)
IMPLICIT NONE
CHARACTER(1), INTENT(IN) :: CIN4(4)
LOGICAL*4, INTENT(IN) :: LSWAP
CHARACTER(4) C4
INTEGER*4 I,I4
EQUIVALENCE(C4,I4)
IF (LSWAP) THEN
DO 1 I=1,4
C4(I:I) = CIN4(5-I)
1 CONTINUE
ELSE
DO 2 I=1,4
C4(I:I) = CIN4(I)
2 CONTINUE
ENDIF
UNPACKI4 = I4
RETURN
END
! !
!======================================================================!
! !
REAL*4 FUNCTION UNPACKR4(LSWAP,CIN4)
IMPLICIT NONE
CHARACTER(1), INTENT(IN) :: CIN4(4)
LOGICAL*4, INTENT(IN) :: LSWAP
REAL*4 R4
INTEGER*4 I
CHARACTER(4) C4
EQUIVALENCE(C4,R4)
IF (LSWAP) THEN
DO 1 I=1,4
C4(I:I) = CIN4(5-I)
1 CONTINUE
ELSE
DO 2 I=1,4
C4(I:I) = CIN4(I)
2 CONTINUE
ENDIF
UNPACKR4 = R4
RETURN
END
! !
!======================================================================!
! !
REAL*8 FUNCTION UNPACKR8(LSWAP,CIN8)
IMPLICIT NONE
CHARACTER(1), INTENT(IN) :: CIN8(8)
LOGICAL*4, INTENT(IN) :: LSWAP
CHARACTER(8) C8
REAL*8 R8
INTEGER*4 I
EQUIVALENCE(C8,R8)
IF (LSWAP) THEN
DO 1 I=1,8
C8(I:I) = CIN8(9-I)
1 CONTINUE
ELSE
DO 2 I=1,8
C8(I:I) = CIN8(I)
2 CONTINUE
ENDIF
UNPACKR8 = R8
RETURN
END
! !
!======================================================================!
! !
FUNCTION ENDIAN()
! This file: http://ftp.aset.psu.edu/pub/ger/fortran/hdk/endian.f90
!
! by Code Tuning co-guide, 1998 Lahey Fortran Users' Conference
! Check what endian this program is running on.
!
! RESULTS MEANING
! ------- -------
! endian = 0 -> little endian
! = 1 -> big endian
! =-1 -> mixed endian
!
!----------------------------------------------------------------------!
!
INTEGER*4 ENDIAN, IEND
INTEGER*4 I, ASCII0, ASCII1, ASCII2, ASCII3
PARAMETER(ASCII0 = 48, ASCII1 = 49, ASCII2 = 50, ASCII3 = 51)
COMMON // I
I = ASCII0 + ASCII1*256 + ASCII2*(256**2) + ASCII3*(256**3)
CALL SUBEND(IEND)
ENDIAN = IEND
RETURN
END
! !
!======================================================================!
! !
SUBROUTINE SUBEND(IEND)
INTEGER*4 IEND
CHARACTER(4) I
COMMON // I
IF (I == '0123') THEN !little endian
IEND = 0
RETURN
ENDIF
IF (I == '3210') THEN !big endian
IEND = 1
RETURN
ENDIF
IEND = -1 !mixed
RETURN
END