1 files changed, 78 insertions, 0 deletions
diff --git a/pkg/tbtables/fitsio/ftgcxd.f b/pkg/tbtables/fitsio/ftgcxd.f
new file mode 100644
index 00000000..9befb70d
--- /dev/null
+++ b/pkg/tbtables/fitsio/ftgcxd.f
@@ -0,0 +1,78 @@
+C----------------------------------------------------------------------
+        subroutine ftgcxd(iunit,colnum,frow,nrow,fbit,nbit,
+     &             dvalue,status)
+
+C       read any consecutive bits from an 'X' or 'B' column as an unsigned
+C       n-bit integer
+
+C       iunit   i  fortran unit number
+C       colnum  i  number of the column to read
+C       frow    i  first row to read
+C       nrow    i  number of rows to read
+C       fbit    i  first bit within the row to read
+C       nbit    i  number of bits to read
+C       dvalue  d  returned value(s)
+C       status  i  output error status
+C
+C       written by Wm Pence, HEASARC/GSFC, Nov 1994
+
+C       COMMON BLOCK DEFINITIONS:--------------------------------------------
+        integer nf,nb,ne
+        parameter (nb = 20)
+        parameter (nf = 3000)
+        parameter (ne = 200)
+        integer bufnum,chdu,hdutyp,maxhdu,hdstrt,hdend,nxthdr,dtstrt
+        integer nxtfld
+        logical wrmode
+        common/ft0001/bufnum(199),chdu(nb),hdutyp(nb),maxhdu(nb),
+     &  wrmode(nb),hdstrt(nb,ne),hdend(nb),nxthdr(nb),dtstrt(nb),nxtfld
+        integer tfield,tstart,tbcol,rowlen,tdtype,trept,tnull,scount
+        integer theap,nxheap
+        double precision tscale,tzero
+        common/ft0002/tfield(nb),tstart(nb),tbcol(nf),rowlen(nb),
+     &  tdtype(nf),trept(nf),tscale(nf),tzero(nf),tnull(nf),scount(nb)
+     &  ,theap(nb),nxheap(nb)
+C       END OF COMMON BLOCK DEFINITIONS-----------------------------------
+
+        integer iunit,colnum,fbit,nbit,frow,nrow,status
+        integer i,k,istart,itodo,ntodo,row,ibuff
+        double precision dvalue(*),power,dval
+        logical lray(64)
+
+        if (status .gt. 0)return
+
+        ibuff=bufnum(iunit)
+        if ((fbit+nbit+6)/8 .gt. trept(colnum+tstart(ibuff)))then
+            call ftpmsg('Asked to read more bits than exist in'//
+     &      ' the column (ftgcxd)')
+            status=308
+            return
+        end if
+
+        row=frow-1
+        do 30 k=1,nrow
+            row=row+1
+            dval=0.
+            power=1.0D+00
+            istart=fbit+nbit
+            ntodo=nbit
+
+10          itodo=min(ntodo,64)
+            istart=istart-itodo
+
+C           read up to 64 bits at a time
+C           get the individual bits
+            call ftgcx(iunit,colnum,row,istart,itodo,lray,status)
+            if (status .gt. 0)return
+
+C           reconstruct the positive integer value
+            do 20 i=itodo,1,-1
+                if (lray(i))dval=dval+power
+                power=power*2.0D+00
+20          continue
+
+            ntodo=ntodo-itodo
+            if (itodo .gt. 0)go to 10
+            dvalue(k)=dval
+30      continue
+        end