/usr/share/gnudatalanguage/astrolib/fxbgrow.pro is in gdl-astrolib 2018.02.16+dfsg-1.
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BUFFERSIZE=BUFFERSIZE0
;+
; NAME:
; FXBGROW
; PURPOSE :
; Increase the number of rows in a binary table.
; EXPLANATION :
; Call FXBGROW to increase the size of an already-existing FITS
; binary table. The number of rows increases to NROWS; however
; the table cannot shrink by this operation. This procedure is
; useful when a table with an unknown number of rows must be
; created. The caller would then call FXBCREATE to construct a
; table of some base size, and follow with calls to FXBGROW to
; lengthen the table as needed. The extension being enlarged
; need not be the last extension in the file. If subsequent
; extensions exist in the file, they will be shifted properly.
;
; CALLING SEQUENCE :
; FXBGROW, UNIT, HEADER, NROWS[, ERRMSG= , NOZERO= , BUFFERSIZE= ]
;
; INPUT PARAMETERS :
; UNIT = Logical unit number of an already-opened file.
; HEADER = String array containing the FITS binary table extension
; header. The header is modified in place.
; NROWS = New number of rows, always more than the previous
; number.
;
; OPTIONAL INPUT KEYWORDS:
; NOZERO = when set, FXBGROW will not zero-pad the new data if
; it doesn't have to.
; ERRMSG = If defined and passed, then any error messages will be
; returned to the user in this parameter rather than
; depending on the MESSAGE routine in IDL. If no errors are
; encountered, then a null string is returned. In order to
; use this feature, ERRMSG must be defined first, e.g.
;
; ERRMSG = ''
; FXBGROW, ERRMSG=ERRMSG, ...
; IF ERRMSG NE '' THEN ...
; BUFFERSIZE = Size in bytes for intermediate data transfers
; (default 32768)
;
; Calls :
; FXADDPAR, FXHREAD, BLKSHIFT
; Common :
; Uses common block FXBINTABLE--see "fxbintable.pro" for more
; information.
; Restrictions:
; The file must be open with write permission.
;
; The binary table extension in question must already by written
; to the file (using FXBCREATE).
;
; A table can never shrink via this operation.
;
; SIDE EFFECTS:
; The FITS file will grow in size, and heap areas are
; preserved by moving them to the end of the file.
;
; The header is modified to reflect the new number of rows.
; CATEGORY :
; Data Handling, I/O, FITS, Generic.
; Initially written, C. Markwardt, GSFC, Nov 1998
; Added ability to enlarge arbitrary extensions and tables with
; variable sized rows, not just the last extension in a file,
; CM, April 2000
; Fix bug in the zeroing of the output file, C. Markwardt, April 2005
;
;-
;
@fxbintable
ON_ERROR, 0
;
; Check the number of parameters.
;
IF N_PARAMS() NE 3 THEN BEGIN
MESSAGE = 'Syntax: FXBGROW, UNIT, HEADER, NROWS'
IF N_ELEMENTS(ERRMSG) NE 0 THEN BEGIN
ERRMSG = MESSAGE
RETURN
END ELSE MESSAGE, MESSAGE
ENDIF
;
; Find the index of the file.
;
ILUN = WHERE(LUN EQ UNIT,NLUN)
ILUN = ILUN[0]
IF NLUN EQ 0 THEN BEGIN
MESSAGE = 'Unit ' + STRTRIM(UNIT,2) + $
' not opened properly'
IF N_ELEMENTS(ERRMSG) NE 0 THEN BEGIN
ERRMSG = MESSAGE
RETURN
END ELSE MESSAGE, MESSAGE
ENDIF
;
; Don't shrink the file.
;
IF NAXIS2[ILUN] GE NROWS THEN GOTO, FINISH
;
; Make sure the file was opened for write access.
;
IF STATE[ILUN] NE 2 THEN BEGIN
MESSAGE = 'Unit ' + STRTRIM(UNIT,2) + $
' not opened for write access'
IF N_ELEMENTS(ERRMSG) NE 0 THEN BEGIN
ERRMSG = MESSAGE
RETURN
END ELSE MESSAGE, MESSAGE
ENDIF
;
; Compute number of bytes and buffer size
;
NBYTES = (NROWS-NAXIS2[ILUN])*NAXIS1[ILUN]
IF N_ELEMENTS(BUFFERSIZE0) EQ 0 THEN BUFFERSIZE0 = 32768L
BUFFERSIZE = LONG(BUFFERSIZE0[0])
BUFFERSIZE = FLOOR(BUFFERSIZE/NAXIS1[ILUN])*NAXIS1[ILUN]
IF BUFFERSIZE LE 0 THEN BUFFERSIZE = NAXIS1[ILUN]
;
; First, shift the following extensions by block multiples
;
;; Current beginning of next extension
N_EXT = NHEADER[ILUN] + HEAP[ILUN] + DHEAP[ILUN]
;; New beginning of next extension, after shifting
N_EXT1 = N_EXT + NBYTES
;; Round to nearest block size
IF N_EXT MOD 2880 NE 0 THEN N_EXT = N_EXT + 2880 - (N_EXT MOD 2880)
IF N_EXT1 MOD 2880 NE 0 THEN N_EXT1 = N_EXT1 + 2880 - (N_EXT1 MOD 2880)
NBYTES1 = N_EXT1 - N_EXT
ERRMSG1 = ''
IF NBYTES1 GT 0 THEN BEGIN
BLKSHIFT, UNIT, N_EXT, NBYTES1, ERRMSG=ERRMSG1, $
NOZERO=KEYWORD_SET(NOZERO), BUFFERSIZE=BUFFERSIZE
IF ERRMSG1 NE '' THEN GOTO, RETMESSAGE
ENDIF
;
; Next, shift the data between the end of the table and the next
; extension, if any.
;
;; End of table data (but before variable-sized heap data)
ETAB = NHEADER[ILUN] + NAXIS1[ILUN]*NAXIS2[ILUN]
IF N_EXT GT ETAB THEN BEGIN
BLKSHIFT, UNIT, [ETAB, N_EXT1-NBYTES-1L], NBYTES, ERRMSG=ERRMSG1, $
NOZERO=KEYWORD_SET(NOZERO), BUFFERSIZE=BUFFERSIZE
ENDIF
RETMESSAGE:
IF ERRMSG1 NE '' THEN BEGIN
MESSAGE = ERRMSG1
IF N_ELEMENTS(ERRMSG) NE 0 THEN BEGIN
ERRMSG = MESSAGE
RETURN
END ELSE MESSAGE, MESSAGE
ENDIF
;
; Zero-fill if necessary (if the original table had no trailing
; extensions)
;
FS = FSTAT(UNIT)
IF FS.SIZE LT N_EXT1 AND NOT KEYWORD_SET(NOZERO) THEN BEGIN
POINT_LUN, UNIT, ETAB
NLEFT = N_EXT1 - ETAB
NBUFF = BUFFERSIZE < NLEFT
BB = BYTARR(NBUFF)
WHILE NLEFT GT 0 DO BEGIN
WRITEU, UNIT, BB
NLEFT = NLEFT - N_ELEMENTS(BB)
IF (NLEFT LT NBUFF) AND (NLEFT GT 0) THEN BB = BB[0:NLEFT-1]
ENDWHILE
ENDIF
;
; Update the internal state.
;
HEAP[ILUN] = HEAP[ILUN] + NBYTES
NAXIS2[ILUN] = NROWS
;
; Modify passed copy of header
;
IF N_ELEMENTS(HEADER) GT 0 THEN BEGIN
FXADDPAR, HEADER, 'NAXIS2', LONG(NROWS), 'Number of rows (grown)'
THEAP = FXPAR(HEADER, 'THEAP', COUNT=COUNT)
IF COUNT GT 0 THEN BEGIN
THEAP = THEAP + NBYTES
FXADDPAR, HEADER, 'THEAP', THEAP, 'Offset of heap'
ENDIF
ENDIF
;
; Modify internal copy of HEADER
;
XHEADER = HEAD[*,ILUN]
FXADDPAR, XHEADER, 'NAXIS2', LONG(NROWS), 'Number of rows (grown)'
THEAP = FXPAR(XHEADER, 'THEAP', COUNT=COUNT)
IF COUNT GT 0 THEN BEGIN
THEAP = THEAP + NBYTES
FXADDPAR, XHEADER, 'THEAP', THEAP, 'Offset of heap'
ENDIF
HEAD[*,ILUN] = XHEADER
;
; Modify disk copy of HEADER
;
POINT_LUN, UNIT, MHEADER[ILUN]
FXHREAD, UNIT, DHEADER, STATUS
IF STATUS NE 0 THEN BEGIN
MESSAGE = 'Could not load header from file'
IF N_ELEMENTS(ERRMSG) NE 0 THEN BEGIN
ERRMSG = MESSAGE
RETURN
END ELSE MESSAGE, MESSAGE
ENDIF
FXADDPAR, DHEADER, 'NAXIS2', LONG(NROWS), 'Number of rows (grown)'
THEAP = FXPAR(DHEADER, 'THEAP', COUNT=COUNT)
IF COUNT GT 0 THEN BEGIN
THEAP = THEAP + NBYTES
FXADDPAR, DHEADER, 'THEAP', THEAP, 'Offset of heap'
ENDIF
;; Don't worry about the header increasing in size, since
;; every binary table has to have NAXIS2 already.
SLEN = STRLEN(DHEADER[0])
FULL = STRING(REPLICATE(32B, 80))
;; Pad with spaces
IF SLEN LT 80 THEN DHEADER[0] = DHEADER[0] + STRMID(FULL,0,80-SLEN)
BHDR = BYTE(DHEADER)
BHDR = BHDR[0:79,*]
POINT_LUN, UNIT, MHEADER[ILUN]
WRITEU, UNIT, BHDR
FINISH:
IF N_ELEMENTS(ERRMSG) NE 0 THEN ERRMSG = ''
RETURN
END
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