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C--------------------------------------------------------------------------
subroutine ftiimg(ounit,bitpix,naxis,naxes,status)
C insert an IMAGE extension following the current HDU
C ounit i fortran output unit number
C bitpix i number of bits per data value
C naxis i number of axes in the data array
C naxes i array giving the length of each data axis
C status i returned error status (0=ok)
integer ounit,bitpix,naxis,naxes(*),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,nhdu,i,savstr,nblock
if (status .gt. 0)return
ibuff=bufnum(ounit)
C close the current HDU to make sure END and fill values are written
call ftchdu(ounit,status)
if (status .gt. 0)return
C save the starting address of the next HDU
nhdu=chdu(ibuff)+1
savstr=hdstrt(ibuff,nhdu)
C define a fake CHDU with a one block header
dtstrt(ibuff)=hdstrt(ibuff,chdu(ibuff))+2880
C define the size of the new HDU (this modifies hdstrt(ibuff,nhdu))
call ftpdef(ounit,bitpix,naxis,naxes,0,1,status)
C use start of next HDU to calc. how big this new HDU is
nblock=(hdstrt(ibuff,nhdu)-hdstrt(ibuff,nhdu-1))/2880
C reset the start of the next HDU back to it original value
hdstrt(ibuff,nhdu)=savstr
C insert the required number of blocks at the end of the real CHDU
C (first define hdutyp so that the correct fill value will be used)
hdutyp(ibuff)=0
call ftiblk(ounit,nblock,1,status)
if (status .gt. 0)return
C increment the number of HDUs in the file and their starting address
maxhdu(ibuff)=maxhdu(ibuff)+1
do 10 i=maxhdu(ibuff),nhdu,-1
hdstrt(ibuff,i+1)=hdstrt(ibuff,i)
10 continue
C again, reset the start of the next HDU back to it original value
hdstrt(ibuff,nhdu)=savstr
C flush the buffers holding data for the old HDU
call ftflsh(ibuff,status)
C recover common block space containing column descriptors for old HDU
call ftfrcl(ounit,status)
C move to the new (empty) HDU
chdu(ibuff)=nhdu
C set parameters describing an empty 1 block header
hdutyp(ibuff)=0
nxthdr(ibuff)=hdstrt(ibuff,nhdu)
hdend(ibuff)= hdstrt(ibuff,nhdu)
dtstrt(ibuff)=hdstrt(ibuff,nhdu)+2888
C write the header keywords
call ftphpr(ounit,.true.,bitpix,naxis,naxes,0,1,.true.,status)
C define the structure of the new HDU
call ftpdef(ounit,bitpix,naxis,naxes,0,1,status)
end
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