WSJT-X/lib/gen65.f90

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subroutine gen65(msg00,ichk,msgsent0,itone,itype) BIND(c)
! Encodes a JT65 message to yieild itone(1:126)
! Temporarily, does not implement EME shorthands
use packjt
character*1 msg00(23),msgsent0(23)
character*22 msg0
character*22 message !Message to be generated
character*22 msgsent !Message as it will be received
integer itone(126)
character*3 cok !' ' or 'OOO'
integer dgen(13)
integer sent(63)
integer nprc(126)
data nprc/1,0,0,1,1,0,0,0,1,1,1,1,1,1,0,1,0,1,0,0, &
0,1,0,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,1,1, &
0,1,1,0,1,1,1,1,0,0,0,1,1,0,1,0,1,0,1,1, &
0,0,1,1,0,1,0,1,0,1,0,0,1,0,0,0,0,0,0,1, &
1,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1, &
0,1,0,1,0,0,1,1,0,0,1,0,0,1,0,0,0,0,1,1, &
1,1,1,1,1,1/
save
do i=1,22
msg0(i:i)=msg00(i)
enddo
if(msg0(1:1).eq.'@') then
read(msg0(2:5),*,end=1,err=1) nfreq
go to 2
1 nfreq=1000
2 itone(1)=nfreq
else
message=msg0
do i=1,22
if(ichar(message(i:i)).eq.0) then
message(i:)=' '
exit
endif
enddo
do i=1,22 !Strip leading blanks
if(message(1:1).ne.' ') exit
message=message(i+1:)
enddo
call chkmsg(message,cok,nspecial,flip)
ntest=0
if(flip.lt.0.0) ntest=1
if(nspecial.eq.0) then
call packmsg(message,dgen,itype) !Pack message into 72 bits
call unpackmsg(dgen,msgsent) !Unpack to get message sent
msgsent(20:22)=cok
call fmtmsg(msgsent,iz)
if(ichk.ne.0) go to 900 !Return if checking only
call rs_encode(dgen,sent) !Apply Reed-Solomon code
call interleave63(sent,1) !Apply interleaving
call graycode65(sent,63,1) !Apply Gray code
nsym=126 !Symbols per transmission
k=0
do j=1,nsym
if(nprc(j).eq.ntest) then
k=k+1
itone(j)=sent(k)+2
else
itone(j)=0
endif
enddo
else
nsym=32
k=0
do j=1,nsym
do n=1,4
k=k+1
if(iand(j,1).eq.1) itone(k)=0
if(iand(j,1).eq.0) itone(k)=10*nspecial
if(k.eq.126) go to 10
enddo
enddo
10 msgsent=message
itype=7
endif
endif
900 do i=1,22
msgsent0(i)=msgsent(i:i)
enddo
msgsent0(23)=char(0)
return
end subroutine gen65