WSJT-X/lib/interleave24.f90

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subroutine interleave24(id,ndir)
integer*1 id(0:205),itmp(0:205)
integer j0(0:205)
logical first
data first/.true./
save first,j0
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.eq.1) then
do i=0,205
itmp(j0(i))=id(i)
enddo
else
do i=0,205
itmp(i)=id(j0(i))
enddo
endif
do i=0,205
id(i)=itmp(i)
enddo
return
end subroutine interleave24