49 lines
1.5 KiB
Plaintext
49 lines
1.5 KiB
Plaintext
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subroutine extractmessage168(decoded,msgreceived,ncrcflag,recent_calls,nrecent)
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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*12 call1,call2
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character*12 recent_calls(nrecent)
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integer*1 decoded(84)
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integer*1, target:: i1Dec8BitBytes(11)
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integer*4 i4Dec6BitWords(12)
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! Collapse 84 decoded bits to 11 bytes. Bytes 1-9 are the message, byte 10 and first half of byte 11 is the crc
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do ibyte=1,9
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itmp=0
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do ibit=1,8
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itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*8+ibit))
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enddo
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i1Dec8BitBytes(ibyte)=itmp
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enddo
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! Need to pack the crc into bytes 10 and 11 for crc12_check
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i1Dec8BitBytes(10)=decoded(73)*8+decoded(74)*4+decoded(75)*2+decoded(76)
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i1Dec8BitBytes(11)=decoded(77)*128+decoded(78)*64+decoded(79)*2*32+decoded(80)*16
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i1Dec8BitBytes(11)=i1Dec8BitBytes(11)+decoded(81)*8+decoded(82)*4+decoded(83)*2+decoded(84)
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if( crc12_check(c_loc (i1Dec8BitBytes), 11) ) then
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! CRC12 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 unpackmsg144(i4Dec6BitWords,msgreceived,call1,call2)
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ncrcflag=1
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if( call1(1:2) .ne. 'CQ' .and. call1(1:2) .ne. ' ' ) then
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call update_recent_calls(call1,recent_calls,nrecent)
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endif
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if( call2(1:2) .ne. ' ' ) then
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call update_recent_calls(call2,recent_calls,nrecent)
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endif
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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 extractmessage168
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