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C--------------------------------------------------------------------------
subroutine ftddef(ounit,bytlen,status)
C Data DEFinition
C re-define the length of the data unit
C this simply redefines the start of the next HDU
C
C ounit i Fortran I/O unit number
C bytlen i new length of the data unit, in bytes
C status i output error status (0 = ok)
C
C written by Wm Pence, HEASARC/GSFC, June 1991
integer ounit,bytlen,status
C COMMON BLOCK DEFINITIONS:--------------------------------------------
integer nb,ne,nf
parameter (nf = 3000)
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
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 ibuff
if (status .gt. 0)return
ibuff=bufnum(ounit)
if (dtstrt(ibuff) .lt. 0)then
C freeze the header at its current size
call fthdef(ounit,0,status)
end if
hdstrt(ibuff,chdu(ibuff)+1)=
& dtstrt(ibuff)+(bytlen+2879)/2880*2880
C initialize the fictitious heap starting address (immediately following
C the array data) and a zero length heap. This is used to find the
C end of the data when checking the fill values in the last block.
scount(ibuff)=0
theap(ibuff)=bytlen
nxheap(ibuff)=0
end
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