WSJT-X/lib/77bit/pack28.f90

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subroutine pack28(c13,n28)
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! Pack a special token, a 22-bit hash code, or a valid base call into a 28-bit
! integer.
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parameter (NTOKENS=2063592,MAX22=4194304)
integer nc(6)
logical is_digit,is_letter
character*13 c13
character*6 callsign
character*1 c
character*4 c4
character*37 a1
character*36 a2
character*10 a3
character*27 a4
data a1/' 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'/
data a2/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'/
data a3/'0123456789'/
data a4/' ABCDEFGHIJKLMNOPQRSTUVWXYZ'/
data nc/37,36,19,27,27,27/
is_digit(c)=c.ge.'0' .and. c.le.'9'
is_letter(c)=c.ge.'A' .and. c.le.'Z'
n28=-1
! Work-around for Swaziland prefix:
if(c13(1:4).eq.'3DA0') callsign='3D0'//c13(5:7)
! Work-around for Guinea prefixes:
if(c13(1:2).eq.'3X' .and. c13(3:3).ge.'A' .and. &
c13(3:3).le.'Z') callsign='Q'//c13(3:6)
! Check for special tokens first
if(c13(1:3).eq.'DE ') then
n28=0
go to 900
endif
if(c13(1:4).eq.'QRZ ') then
n28=1
go to 900
endif
if(c13(1:3).eq.'CQ ') then
n28=2
go to 900
endif
if(c13(1:3).eq.'CQ_') then
n=len(trim(c13))
if(n.ge.4 .and. n.le.7) then
nlet=0
nnum=0
do i=4,n
c=c13(i:i)
if(c.ge.'A' .and. c.le.'Z') nlet=nlet+1
if(c.ge.'0' .and. c.le.'9') nnum=nnum+1
enddo
if(nnum.eq.3 .and. nlet.eq.0) then
read(c13(4:3+nnum),*) nqsy
n28=3+nqsy
go to 900
endif
if(nlet.ge.1 .and. nlet.le.4 .and. nnum.eq.0) then
c4=c13(4:n)//' '
c4=adjustr(c4)
m=0
do i=1,4
j=0
c=c4(i:i)
if(c.ge.'A' .and. c.le.'Z') j=ichar(c)-ichar('A')+1
m=27*m + j
enddo
n28=3+1000+m
go to 900
endif
endif
endif
! Check for <...> callsign
if(c13(1:1).eq.'<')then
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n22=ihashcall(c13,22)
call hash22(n22,c13,1) !Save (key,value) in hash table
n28=NTOKENS + n22
go to 900
endif
! Check for standard callsign
iarea=-1
n=len(trim(c13))
do i=n,2,-1
if(is_digit(c13(i:i))) exit
enddo
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iarea=i !Call-area digit
npdig=0 !Digits before call area
nplet=0 !Letters before call area
do i=1,iarea-1
if(is_digit(c13(i:i))) npdig=npdig+1
if(is_letter(c13(i:i))) nplet=nplet+1
enddo
nslet=0
do i=iarea+1,n
if(is_letter(c13(i:i))) nslet=nslet+1
enddo
if(iarea.lt.2 .or. iarea.gt.3 .or. nplet.eq.0 .or. &
npdig.ge.iarea-1 .or. nslet.gt.3) then
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! print*,'a',npdig,nplet,iarea
! Treat this as a nonstandard callsign: compute its 22-bit hash
n22=ihashcall(c13,22)
call hash22(n22,c13,1) !Save (key,value) in hash table
n28=NTOKENS + n22
go to 900
endif
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n=len(trim(c13))
! This is a standard callsign
if(iarea.eq.2) callsign=' '//c13(1:5)
if(iarea.eq.3) callsign=c13(1:6)
i1=index(a1,callsign(1:1))-1
i2=index(a2,callsign(2:2))-1
i3=index(a3,callsign(3:3))-1
i4=index(a4,callsign(4:4))-1
i5=index(a4,callsign(5:5))-1
i6=index(a4,callsign(6:6))-1
n28=36*10*27*27*27*i1 + 10*27*27*27*i2 + 27*27*27*i3 + 27*27*i4 + &
27*i5 + i6
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n28=n28 + NTOKENS + MAX22
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900 n28=iand(n28,2**28-1)
return
end subroutine pack28