WSJT-X/lib/interleave9.f90

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subroutine interleave9(ia,ndir,ib)
integer*1 ia(0:205),ib(0:205)
integer j0(0:205)
logical first
data first/.true./
save first,j0 !Save not working, or j0 overwritten ???
if(first) then
k=-1
do i=0,255
m=i
n=iand(m,1)
n=2*n + iand(m/2,1)
n=2*n + iand(m/4,1)
n=2*n + iand(m/8,1)
n=2*n + iand(m/16,1)
n=2*n + iand(m/32,1)
n=2*n + iand(m/64,1)
n=2*n + iand(m/128,1)
if(n.le.205) then
k=k+1
j0(k)=n
endif
enddo
! first=.false.
endif
if(ndir.gt.0) then
do i=0,205
ib(j0(i))=ia(i)
enddo
else
do i=0,205
ib(i)=ia(j0(i))
enddo
endif
return
end subroutine interleave9