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48 lines
1.3 KiB
Fortran
48 lines
1.3 KiB
Fortran
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subroutine packtext(msg,nc1,nc2,nc3)
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parameter (MASK28=2**28 - 1)
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character*13 msg
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character*42 c
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data c/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ +-./?'/
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nc1=0
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nc2=0
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nc3=0
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do i=1,5 !First 5 characters in nc1
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do j=1,42 !Get character code
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if(msg(i:i).eq.c(j:j)) go to 10
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enddo
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j=37
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10 j=j-1 !Codes should start at zero
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nc1=42*nc1 + j
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enddo
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do i=6,10 !Characters 6-10 in nc2
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do j=1,42 !Get character code
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if(msg(i:i).eq.c(j:j)) go to 20
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enddo
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j=37
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20 j=j-1 !Codes should start at zero
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nc2=42*nc2 + j
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enddo
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do i=11,13 !Characters 11-13 in nc3
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do j=1,42 !Get character code
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if(msg(i:i).eq.c(j:j)) go to 30
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enddo
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j=37
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30 j=j-1 !Codes should start at zero
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nc3=42*nc3 + j
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enddo
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! We now have used 17 bits in nc3. Must move one each to nc1 and nc2.
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nc1=nc1+nc1
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if(iand(nc3,32768).ne.0) nc1=nc1+1
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nc2=nc2+nc2
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if(iand(nc3,65536).ne.0) nc2=nc2+1
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nc3=iand(nc3,32767)
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return
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end subroutine packtext
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