1 files changed, 98 insertions, 0 deletions
diff --git a/pkg/tbtables/fitsio/ftdblk.f b/pkg/tbtables/fitsio/ftdblk.f
new file mode 100644
index 00000000..2fd56c04
--- /dev/null
+++ b/pkg/tbtables/fitsio/ftdblk.f
@@ -0,0 +1,98 @@
+C--------------------------------------------------------------------------
+        subroutine ftdblk(ounit,nblock,hdrdat,status)
+
+C       delete  2880-byte FITS blocks at the end of the current header or data
+
+C       ounit   i  fortran output unit number
+C       nblock  i  number of 2880-byte blocks to be deleted
+C       hdrdat  i  delete space at end of header (0) or data (1)
+C       status  i  returned error status (0=ok)
+
+        integer ounit,nblock,hdrdat,status
+
+C       COMMON BLOCK DEFINITIONS:--------------------------------------------
+        integer nb,ne
+        parameter (nb = 20)
+        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
+        character*1 buff(5760)
+        common/ftheap/buff
+C       END OF COMMON BLOCK DEFINITIONS:------------------------------------
+
+        integer ibuff,jpoint,i,tstat
+
+        if (status .gt. 0)return
+
+C       get the number of the data buffer used for this unit
+        ibuff=bufnum(ounit)
+
+C       get address of first block to be deleted/overwritten
+        if (hdrdat .eq. 0)then
+            jpoint=dtstrt(ibuff)-2880*nblock
+        else
+            jpoint=hdstrt(ibuff,chdu(ibuff)+1)-2880*nblock
+        end if
+
+C       move each block up, until we reach the end of file
+10      continue
+C           move to the read start position
+            tstat=status
+            call ftmbyt(ounit,jpoint+nblock*2880,.false.,status)
+
+C           read one 2880-byte FITS logical record 
+            call ftgcbf(ounit,0,2880,buff,status)
+
+C           check for end of file
+            if (status .eq. 107)then
+                status=tstat
+                go to 20
+            end if
+
+C           move back to the write start postion
+            call ftmbyt(ounit,jpoint,.false.,status)
+
+C           write the 2880-byte FITS logical record
+            call ftpcbf(ounit,0,2880,buff,status)
+
+C           check for error 
+            if (status .gt. 0)then
+                call ftpmsg('Error deleting FITS blocks (FTDBLK)')
+                return
+            end if
+
+C           increment pointer to next block and loop back
+            jpoint=jpoint+2880
+            go to 10
+20      continue
+
+C       now fill the last nblock blocks with zeros;  initialize the  buffer
+        do 30 i=1,2880
+            buff(i)=char(0)
+30      continue
+
+C       move back to the write start postion
+        call ftmbyt(ounit,jpoint,.false.,status)
+
+C       write the 2880-byte block NBLOCK times.
+        do 40 i=1,nblock
+            call ftpcbf(ounit,0,2880,buff,status)
+40      continue
+
+        if (hdrdat .eq. 0)then
+C           recalculate the starting location of the current data unit, if moved
+            dtstrt(ibuff)=dtstrt(ibuff)-2880*nblock
+        end if
+
+C       recalculate the starting location of all subsequent HDUs
+        do 50 i=chdu(ibuff)+1,maxhdu(ibuff)+1
+            hdstrt(ibuff,i)=hdstrt(ibuff,i)-2880*nblock
+50      continue
+
+        if (status .gt. 0)then
+            call ftpmsg('Error deleting FITS block(s) (FTDBLK)')
+        end if
+        end