diff options
Diffstat (limited to 'pkg/tbtables/fitsio/ftdcol.f')
| -rw-r--r-- | pkg/tbtables/fitsio/ftdcol.f | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/pkg/tbtables/fitsio/ftdcol.f b/pkg/tbtables/fitsio/ftdcol.f new file mode 100644 index 00000000..8e9b11d7 --- /dev/null +++ b/pkg/tbtables/fitsio/ftdcol.f @@ -0,0 +1,132 @@ +C-------------------------------------------------------------------------- + subroutine ftdcol(iunit,colnum,status) + +C delete a column from a table + +C iunit i Fortran I/O unit number +C colnum i number of of the column to be deleted +C status i returned error status (0=ok) + + integer iunit,colnum,status + +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 ibuff,typhdu,delbyt,fstbyt,sp,tflds,i + integer naxis1,naxis2,size,freesp,nblock,tbc + character comm*70,keynam*8 + + if (status .gt. 0)return + +C define the number of the buffer used for this file + ibuff=bufnum(iunit) + +C test that the CHDU is an ASCII table or BINTABLE + typhdu=hdutyp(ibuff) + if (typhdu .ne. 1 .and. typhdu .ne. 2)then + status=235 + call ftpmsg('Can only delete column from TABLE '// + & 'or BINTABLE extension (FTDCOL)') + return + end if + +C check if column number exists in the table + tflds=tfield(ibuff) + if (colnum .lt. 1 .or. colnum .gt. tflds)then + status=302 + return + end if + +C get the starting byte position of the column (=zero for first column) + fstbyt=tbcol(colnum+tstart(ibuff)) + +C find the width of the column + if (typhdu .eq. 1)then +C tnull is used to store the width of the ASCII column field +C NOTE: ASCII columns may not be in physical order, or may overlap. + + delbyt=tnull(colnum+tstart(ibuff)) + +C delete the space(s) between the columns, if there are any. + if (colnum .lt. tflds)then +C check for spaces between following column + sp=tbcol(colnum+1+tstart(ibuff))-tbcol(colnum+ + & tstart(ibuff))-delbyt + if (sp .gt. 0)then + delbyt=delbyt+1 + end if + else if (colnum .gt. 1)then +C check for space between the last and next to last columns + sp=tbcol(colnum+tstart(ibuff))-tbcol(colnum-1+ + & tstart(ibuff))-tnull(colnum-1+tstart(ibuff)) + if (sp .gt. 0)then + delbyt=delbyt+1 + fstbyt=fstbyt-1 + end if + end if + else + if (colnum .lt. tflds)then + delbyt=tbcol(colnum+1+tstart(ibuff))- + & tbcol(colnum+tstart(ibuff)) + else + delbyt=rowlen(ibuff)-tbcol(colnum+tstart(ibuff)) + end if + end if + +C get current size of the table + naxis1=rowlen(ibuff) + call ftgkyj(iunit,'NAXIS2',naxis2,comm,status) + +C Calculate how many FITS blocks (2880 bytes) need to be deleted + size=theap(ibuff)+scount(ibuff) + freesp=(delbyt*naxis2) + ((size+2879)/2880)*2880 - size + nblock=freesp/2880 + +C shift each row up, deleting the desired column + call ftcdel(iunit,naxis1,naxis2,delbyt,fstbyt,status) + +C shift the heap up and update pointer to start of heap + size=delbyt*naxis2 + call fthpup(iunit,size,status) + +C delete the needed number of new FITS blocks at the end of the HDU + if (nblock .gt. 0)call ftdblk(iunit,nblock,1,status) + + if (typhdu .eq. 1)then +C adjust the TBCOL values of the remaining columns + do 10 i=1,tflds + call ftkeyn('TBCOL',i,keynam,status) + call ftgkyj(iunit,keynam,tbc,comm,status) + if (tbc .gt. fstbyt)then + tbc=tbc-delbyt + call ftmkyj(iunit,keynam,tbc,'&',status) + end if +10 continue + end if + +C update the mandatory keywords + call ftmkyj(iunit,'TFIELDS',tflds-1,'&',status) + call ftmkyj(iunit,'NAXIS1',naxis1-delbyt,'&',status) + +C delete the index keywords starting with 'T' associated with the +C deleted column and subtract 1 from index of all higher keywords + call ftkshf(iunit,colnum,tflds,-1,status) + +C parse the header to initialize the new table structure + call ftrdef(iunit,status) + end |