WSJT-X/lib/packbits.f90

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subroutine packbits(dbits,nsymd,m0,sym)
! Pack 0s and 1s from dbits() into sym() with m0 bits per word.
! NB: nsymd is the number of packed output words.
integer sym(nsymd)
integer*1 dbits(*)
k=0
do i=1,nsymd
n=0
do j=1,m0
k=k+1
m=dbits(k)
n=ior(ishft(n,1),m)
enddo
sym(i)=n
enddo
return
end subroutine packbits