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