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/* Fitsy FITS header creation routines.
EXAMPLES
+
FITSHead fits;
fits = #ft_headinit(NULL, 0); /-* Create an empty header *-/
/-* Build a FITS file header by hand.
*-/
#ft_headappl(fits, "SIMPLE", 0, 1, "Primary FITS image array");
#ft_headappi(fits, "BITPIX", 0, -32, "Single floats");
#ft_headappi(fits, "NAXIS" , 0, 2, "2d image");
#ft_headappi(fits, "NAXIS" , 1, 256, "X axis is 256");
#ft_headappi(fits, "NAXIS" , 2, 256, "Y axis is 256");
+
*/
#include "xos.h"
#include "fitsy.h"
/* Create or import a FITS header to Fitsy.
This is the primary way in which FITSHead structures are created.
If #cards is not NULL then then #acard cards are scanned from the memory
in search of the END card. When a memory block is passed in to #ft_headinit
then it is considered ~unmanaged~ and will not be freed by #ft_headfree.
If #cards is NULL, then #acards cards will be allocated for use as a FITSHead.
If #acards is 0 the #FT_CARDS will be allocated (36).
*/
FITSHead ft_headinit(data, bytes)
void *data; /* Pointer to FITS cards. */
int bytes; /* Number of bytes in buffer. */
{
int match;
FITSHead fits;
FITSCard end = NULL;
FITSBuff *cards;
/* cast the namby-pamby void into a real pointer
*/
cards = (FITSCard) data;
Calloc(fits, sizeof(struct _FITSHead));
fits->mem = FT_MALLOC;
fits->primary = NULL;
fits->filename = NULL;
fits->rfcount = 1;
if ( cards ) {
fits->cards = fits->last = cards;
fits->acard = fits->ncard = Abs(bytes/FT_CARDLEN);
if ( bytes > 0 ) fits->mem = FT_EXTERN;
if ( bytes > 0 && (end=ft_headfindseq(fits, "END", 0, &match)) ) {
fits->ncard = end - fits->cards + 1;
fits->acard = ((fits->ncard+FT_CARDS-1)/FT_CARDS) * FT_CARDS;
fits->data = fits->acard * FT_CARDLEN;
}
} else {
if ( bytes == 0 ) bytes = FT_CARDS * FT_CARDLEN;
fits->acard = bytes/FT_CARDLEN ? bytes/FT_CARDLEN : FT_CARDS;
(void)Calloc(fits->cards, sizeof(FITSBuff) * fits->acard + 1);
/* make sure there is a null at the end (EGM) */
((char *)fits->cards)[sizeof(FITSBuff) * fits->acard] = '\0';
ft_cardclr(fits->cards, fits->acard);
fits->ncard = 0;
fits->data = fits->acard * FT_CARDLEN;
}
fits->index = NULL;
fits->last = fits->cards;
if ( !cards || (bytes > 0 && !end) ) {
fits->ncard = 1;
ft_cardkey(fits->cards, "END", 0);
} else {
if ( end ) {
ft_syncdata(fits);
}
}
fits->sync = 0;
fits->cache = NULL;
return fits;
}
/* Make a copy of a #FITSHead data structure.
*/
FITSHead ft_headcopy(fits)
FITSHead fits;
{
FITSHead head;
if ( fits == NULL ) return ft_headinit(NULL, 0);
Calloc(head, sizeof(struct _FITSHead));
head->primary = NULL;
head->rfcount = 1;
if ( fits->primary )
ft_primlink(fits->primary, head);
memmove(head, fits, sizeof(struct _FITSHead));
(void)Calloc (head->cards, head->acard * FT_CARDLEN + 1);
/* make sure there is a null at the end (EGM) */
((char *)head->cards)[head->acard * FT_CARDLEN] = '\0';
memmove(head->cards, fits->cards, head->acard * FT_CARDLEN);
head->index = NULL;
head->basic = NULL;
head->image = NULL;
head->table = NULL;
head->mem = FT_MALLOC;
head->mmap_here = 0;
head->mmap_size = 0;
/* realloc filename string for the copy record */
if( head->filename ) head->filename = strdup(head->filename);
ft_syncdata(head);
if( head->index && !fits->index ){
(void)Free(head->index);
head->index = NULL;
}
return head;
}
/* Free a Fitsy FITS header data structure.
*/
void ft_headfree(fits, freecards)
FITSHead fits;
int freecards; /* Free the FITS cards? */
{
if ( fits == NULL ) return;
if ( --fits->rfcount ) return;
if ( fits->index ) (void)Free(fits->index);
if ( fits->filename ) (void)Free(fits->filename);
if ( fits->basic ) ft_basicfree(fits->basic);
if ( fits->image ) ft_imagefree(fits->image);
if ( fits->table ) ft_tablefree(fits->table);
if ( fits->mem == FT_MALLOC && freecards ) (void)Free(fits->cards);
#ifdef HAVE_SYS_MMAN_H
if ( fits->mem == FT_MMAP ) ft_munmap(fits);
#endif
#ifdef HAVE_SYS_SHM_H
if ( fits->mem == FT_SHMAT ) ft_shmdt(fits);
#endif
if ( fits->primary ) ft_headfree(fits->primary, 1);
(void)Free(fits);
}
void ft_primlink(prim, fits)
FITSHead prim;
FITSHead fits;
{
if ( prim == NULL ) return;
if ( fits == NULL ) return;
fits->primary = prim;
prim->rfcount++;
}
/* Set the card buffer
*/
void ft_setcards(fits, cards)
FITSHead fits;
void *cards;
{
fits->cards = (FITSCard) cards;
}
/* Make a copy of the header and force it to be a simple primary header.
*/
FITSHead ft_primary(fits)
FITSHead fits;
{
FITSHead prim;
int one = 1;
prim = ft_headcopy(fits);
ft_cardfmt(ft_cardnth(prim, 1)
, "SIMPLE", 0, FT_LOGICAL, &one, 0, FT_Comment);
ft_headdel(prim, "EXTVER", 0);
ft_headdel(prim, "GCOUNT", 0);
ft_headdel(prim, "PCOUNT", 0);
ft_headdel(prim, "EXTEND", 0);
ft_headdel(prim, "NEXTEND", 0);
ft_headdel(prim, "INHERIT", 0);
return prim;
}
/* Merge cards from fits1 to fits2
*/
FITSHead ft_headmerge(fits1, fits2, copy)
FITSHead fits1;
FITSHead fits2;
int copy;
{
FITSHead merge;
FITSCard card;
int i, match;
merge = ft_headcopy(fits1);
if ( fits2 != NULL ) {
i = 1;
card = ft_cardnth(fits2, 1);
if( !strcmp(card->c, "SIMPLE") || !strcmp(card->c, "XTENSION") )
i = 2;
for ( ; i < ft_ncards(fits2); i++ ) {
/* The card is not in the merge header
*/
if ( !(card = ft_cardfindseq(merge
, ft_cardnth(fits2, i), &match)) ) {
ft_cardapp(merge, ft_cardnth(fits2, i));
} else {
if ( !match ) {
ft_cardins(merge, ft_cardnth(fits2, i), card);
} else {
/* special cards always are inserted */
if( !strncmp(card->c, "HISTORY ", 8) ||
!strncmp(card->c, "CONTINUE ", 9) ||
!strncmp(card->c, "COMMENT ", 8) ||
!strncmp(card->c, " ", 8) )
ft_cardapp(merge, ft_cardnth(fits2, i));
else if( copy ) ft_cardcpy(card , ft_cardnth(fits2, i));
}
}
}
}
ft_syncdata(merge);
return merge;
}
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