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program QRA64code
! Provides examples of message packing, bit and symbol ordering,
! QRA (63,12) encoding, and other necessary details of the QRA64
! protocol.
use packjt
character*22 msg,msg0,msg1,decoded,cok*3,msgtype*10
integer dgen(12),sent(63)
integer icos7(0:6)
data icos7/2,5,6,0,4,1,3/ !Defines a 7x7 Costas array
include 'testmsg.f90'
nargs=iargc()
if(nargs.lt.1) then
print*,'Usage: qra64code "message"'
print*,' qra64code -t'
go to 999
endif
call getarg(1,msg) !Get message from command line
nmsg=1
if(msg(1:2).eq."-t") nmsg=NTEST
write(*,1010)
1010 format(" Message Decoded Err? Type"/74("-"))
do imsg=1,nmsg
if(nmsg.gt.1) msg=testmsg(imsg)
call fmtmsg(msg,iz) !To upper, collapse mult blanks
msg0=msg !Input message
call chkmsg(msg,cok,nspecial,flip) !See if it includes "OOO" report
msg1=msg !Message without "OOO"
call packmsg(msg1,dgen,itype) !Pack message into 12 six-bit bytes
msgtype=""
if(itype.eq.1) msgtype="Std Msg"
if(itype.eq.2) msgtype="Type 1 pfx"
if(itype.eq.3) msgtype="Type 1 sfx"
if(itype.eq.4) msgtype="Type 2 pfx"
if(itype.eq.5) msgtype="Type 2 sfx"
if(itype.eq.6) msgtype="Free text"
call qra64_enc(dgen,sent) !Encode using QRA64
call unpackmsg(dgen,decoded) !Unpack the user message
call fmtmsg(decoded,iz)
ii=imsg
write(*,1020) ii,msg0,decoded,itype,msgtype
1020 format(i4,1x,a22,2x,a22,4x,i3,": ",a13)
enddo
if(nmsg.eq.1) then
write(*,1030) dgen
1030 format(/'Packed message, 6-bit symbols ',12i3) !Display packed symbols
write(*,1040) sent
1040 format(/'Information-carrying channel symbols'/(i5,29i3))
write(*,1050) 10*icos7,sent(1:32),10*icos7,sent(33:63),10*icos7
1050 format(/'Channel symbols including sync'/(i5,29i3))
endif
999 end program QRA64code
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