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41 lines
1.1 KiB
Fortran
41 lines
1.1 KiB
Fortran
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subroutine extractmessage174_91(decoded,msgreceived,ncrcflag)
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use iso_c_binding, only: c_loc,c_size_t
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use crc
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use packjt
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character*22 msgreceived
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character*91 cbits
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integer*1 decoded(91)
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integer*1, target:: i1Dec8BitBytes(12)
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integer*4 i4Dec6BitWords(12)
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! Write decoded bits into cbits: 77-bit message plus 14-bit CRC
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write(cbits,1000) decoded
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1000 format(91i1)
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read(cbits,1001) i1Dec8BitBytes
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1001 format(12b8)
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read(cbits,1002) ncrc14 !Received CRC12
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1002 format(77x,b14)
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i1Dec8BitBytes(10)=iand(i1Dec8BitBytes(10),128+64+32+16+8)
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i1Dec8BitBytes(11:12)=0
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icrc14=crc14(c_loc(i1Dec8BitBytes),12) !CRC12 computed from 75 msg bits
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if(ncrc14.eq.icrc14 .or. sum(decoded(57:87)).eq.0) then !### Kludge ###
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! CRC14 checks out --- unpack 72-bit message
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do ibyte=1,12
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itmp=0
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do ibit=1,6
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itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*6+ibit))
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enddo
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i4Dec6BitWords(ibyte)=itmp
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enddo
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call unpackmsg(i4Dec6BitWords,msgreceived,.false.,' ')
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ncrcflag=1
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else
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msgreceived=' '
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ncrcflag=-1
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endif
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return
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end subroutine extractmessage174_91
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